./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/loops-crafted-1/mono-crafted_14.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version aef121e0 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_20fce25a-636c-4f8a-9d1c-fe541eb08a14/bin/utaipan-EQgc7hIp5V/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_20fce25a-636c-4f8a-9d1c-fe541eb08a14/bin/utaipan-EQgc7hIp5V/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_20fce25a-636c-4f8a-9d1c-fe541eb08a14/bin/utaipan-EQgc7hIp5V/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_20fce25a-636c-4f8a-9d1c-fe541eb08a14/bin/utaipan-EQgc7hIp5V/config/TaipanReach.xml -i ../../sv-benchmarks/c/loops-crafted-1/mono-crafted_14.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_20fce25a-636c-4f8a-9d1c-fe541eb08a14/bin/utaipan-EQgc7hIp5V/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_20fce25a-636c-4f8a-9d1c-fe541eb08a14/bin/utaipan-EQgc7hIp5V --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 538775af36be57be36a6cd470d0ff7a3d7714753249a7d4cb9a7b907cdacda78 --- Real Ultimate output --- This is Ultimate 0.2.1-dev-aef121e [2021-11-23 02:10:48,464 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-23 02:10:48,466 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-23 02:10:48,498 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-23 02:10:48,498 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-23 02:10:48,500 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-23 02:10:48,501 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-23 02:10:48,504 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-23 02:10:48,506 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-23 02:10:48,507 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-23 02:10:48,508 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-23 02:10:48,510 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-23 02:10:48,510 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-23 02:10:48,512 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-23 02:10:48,513 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-23 02:10:48,515 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-23 02:10:48,516 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-23 02:10:48,517 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-23 02:10:48,520 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-23 02:10:48,522 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-23 02:10:48,524 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-23 02:10:48,532 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-23 02:10:48,533 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-23 02:10:48,535 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-23 02:10:48,538 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-23 02:10:48,539 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-23 02:10:48,539 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-23 02:10:48,540 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-23 02:10:48,541 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-23 02:10:48,542 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-23 02:10:48,543 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-23 02:10:48,544 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-23 02:10:48,552 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-23 02:10:48,554 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-23 02:10:48,555 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-23 02:10:48,555 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-23 02:10:48,556 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-23 02:10:48,557 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-23 02:10:48,557 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-23 02:10:48,558 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-23 02:10:48,559 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-23 02:10:48,560 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_20fce25a-636c-4f8a-9d1c-fe541eb08a14/bin/utaipan-EQgc7hIp5V/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-23 02:10:48,594 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-23 02:10:48,594 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-23 02:10:48,594 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-23 02:10:48,595 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-23 02:10:48,595 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-23 02:10:48,595 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-23 02:10:48,601 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-23 02:10:48,602 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-23 02:10:48,602 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-23 02:10:48,602 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-23 02:10:48,602 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-23 02:10:48,602 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-23 02:10:48,602 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-23 02:10:48,603 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-23 02:10:48,603 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-23 02:10:48,603 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-23 02:10:48,603 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-23 02:10:48,603 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-23 02:10:48,604 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-23 02:10:48,604 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-23 02:10:48,605 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-23 02:10:48,605 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-23 02:10:48,605 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-23 02:10:48,605 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-23 02:10:48,605 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-23 02:10:48,606 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-23 02:10:48,606 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-23 02:10:48,606 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-23 02:10:48,606 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-23 02:10:48,606 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-23 02:10:48,606 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-23 02:10:48,607 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-23 02:10:48,607 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 02:10:48,607 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-23 02:10:48,607 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-23 02:10:48,607 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-23 02:10:48,608 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-23 02:10:48,608 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-23 02:10:48,608 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-23 02:10:48,608 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-23 02:10:48,608 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-23 02:10:48,609 INFO L138 SettingsManager]: * Abstract interpretation Mode=USE_PREDICATES WARNING: An illegal reflective access operation has occurred WARNING: Illegal reflective access by com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 (file:/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_20fce25a-636c-4f8a-9d1c-fe541eb08a14/bin/utaipan-EQgc7hIp5V/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_20fce25a-636c-4f8a-9d1c-fe541eb08a14/bin/utaipan-EQgc7hIp5V Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 538775af36be57be36a6cd470d0ff7a3d7714753249a7d4cb9a7b907cdacda78 [2021-11-23 02:10:48,920 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-23 02:10:48,945 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-23 02:10:48,948 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-23 02:10:48,949 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-23 02:10:48,950 INFO L275 PluginConnector]: CDTParser initialized [2021-11-23 02:10:48,951 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_20fce25a-636c-4f8a-9d1c-fe541eb08a14/bin/utaipan-EQgc7hIp5V/../../sv-benchmarks/c/loops-crafted-1/mono-crafted_14.c [2021-11-23 02:10:49,010 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_20fce25a-636c-4f8a-9d1c-fe541eb08a14/bin/utaipan-EQgc7hIp5V/data/9fb77f1a6/dab13d459c1541d492fb49b48433e165/FLAG6edf20240 [2021-11-23 02:10:49,586 INFO L306 CDTParser]: Found 1 translation units. [2021-11-23 02:10:49,586 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_20fce25a-636c-4f8a-9d1c-fe541eb08a14/sv-benchmarks/c/loops-crafted-1/mono-crafted_14.c [2021-11-23 02:10:49,596 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_20fce25a-636c-4f8a-9d1c-fe541eb08a14/bin/utaipan-EQgc7hIp5V/data/9fb77f1a6/dab13d459c1541d492fb49b48433e165/FLAG6edf20240 [2021-11-23 02:10:49,961 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_20fce25a-636c-4f8a-9d1c-fe541eb08a14/bin/utaipan-EQgc7hIp5V/data/9fb77f1a6/dab13d459c1541d492fb49b48433e165 [2021-11-23 02:10:49,966 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-23 02:10:49,968 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-23 02:10:49,973 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-23 02:10:49,973 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-23 02:10:49,977 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-23 02:10:49,978 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 02:10:49" (1/1) ... [2021-11-23 02:10:49,981 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@658b3c51 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:10:49, skipping insertion in model container [2021-11-23 02:10:49,981 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 02:10:49" (1/1) ... [2021-11-23 02:10:49,989 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-23 02:10:50,004 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-23 02:10:50,177 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_20fce25a-636c-4f8a-9d1c-fe541eb08a14/sv-benchmarks/c/loops-crafted-1/mono-crafted_14.c[319,332] [2021-11-23 02:10:50,211 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 02:10:50,218 INFO L203 MainTranslator]: Completed pre-run [2021-11-23 02:10:50,230 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_20fce25a-636c-4f8a-9d1c-fe541eb08a14/sv-benchmarks/c/loops-crafted-1/mono-crafted_14.c[319,332] [2021-11-23 02:10:50,234 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 02:10:50,255 INFO L208 MainTranslator]: Completed translation [2021-11-23 02:10:50,256 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:10:50 WrapperNode [2021-11-23 02:10:50,256 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-23 02:10:50,257 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-23 02:10:50,257 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-23 02:10:50,258 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-23 02:10:50,268 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:10:50" (1/1) ... [2021-11-23 02:10:50,279 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:10:50" (1/1) ... [2021-11-23 02:10:50,303 INFO L137 Inliner]: procedures = 12, calls = 9, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 43 [2021-11-23 02:10:50,304 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-23 02:10:50,305 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-23 02:10:50,305 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-23 02:10:50,306 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-23 02:10:50,314 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:10:50" (1/1) ... [2021-11-23 02:10:50,314 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:10:50" (1/1) ... [2021-11-23 02:10:50,316 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:10:50" (1/1) ... [2021-11-23 02:10:50,316 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:10:50" (1/1) ... [2021-11-23 02:10:50,319 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:10:50" (1/1) ... [2021-11-23 02:10:50,323 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:10:50" (1/1) ... [2021-11-23 02:10:50,324 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:10:50" (1/1) ... [2021-11-23 02:10:50,326 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-23 02:10:50,327 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-23 02:10:50,327 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-23 02:10:50,327 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-23 02:10:50,328 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:10:50" (1/1) ... [2021-11-23 02:10:50,348 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 02:10:50,359 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_20fce25a-636c-4f8a-9d1c-fe541eb08a14/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:10:50,369 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_20fce25a-636c-4f8a-9d1c-fe541eb08a14/bin/utaipan-EQgc7hIp5V/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-23 02:10:50,373 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_20fce25a-636c-4f8a-9d1c-fe541eb08a14/bin/utaipan-EQgc7hIp5V/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-23 02:10:50,411 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-23 02:10:50,411 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-23 02:10:50,411 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-23 02:10:50,411 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-23 02:10:50,411 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2021-11-23 02:10:50,412 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2021-11-23 02:10:50,486 INFO L236 CfgBuilder]: Building ICFG [2021-11-23 02:10:50,488 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-23 02:10:50,657 INFO L277 CfgBuilder]: Performing block encoding [2021-11-23 02:10:50,680 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-23 02:10:50,681 INFO L301 CfgBuilder]: Removed 2 assume(true) statements. [2021-11-23 02:10:50,683 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 02:10:50 BoogieIcfgContainer [2021-11-23 02:10:50,684 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-23 02:10:50,685 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-23 02:10:50,686 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-23 02:10:50,689 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-23 02:10:50,689 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.11 02:10:49" (1/3) ... [2021-11-23 02:10:50,690 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@69ffabf4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 02:10:50, skipping insertion in model container [2021-11-23 02:10:50,691 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:10:50" (2/3) ... [2021-11-23 02:10:50,691 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@69ffabf4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 02:10:50, skipping insertion in model container [2021-11-23 02:10:50,691 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 02:10:50" (3/3) ... [2021-11-23 02:10:50,693 INFO L111 eAbstractionObserver]: Analyzing ICFG mono-crafted_14.c [2021-11-23 02:10:50,700 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-23 02:10:50,700 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-23 02:10:50,772 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-23 02:10:50,783 INFO L339 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mLoopAccelerationTechnique=FAST_UPR [2021-11-23 02:10:50,784 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-23 02:10:50,818 INFO L276 IsEmpty]: Start isEmpty. Operand has 13 states, 8 states have (on average 1.5) internal successors, (12), 9 states have internal predecessors, (12), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-23 02:10:50,825 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2021-11-23 02:10:50,825 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:10:50,826 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:10:50,826 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:10:50,834 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:10:50,834 INFO L85 PathProgramCache]: Analyzing trace with hash -1099884338, now seen corresponding path program 1 times [2021-11-23 02:10:50,854 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:10:50,855 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [508211407] [2021-11-23 02:10:50,855 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:10:50,856 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:10:50,968 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:10:51,034 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:10:51,035 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:10:51,035 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [508211407] [2021-11-23 02:10:51,036 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [508211407] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:10:51,036 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:10:51,037 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-23 02:10:51,038 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1453932877] [2021-11-23 02:10:51,039 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:10:51,043 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 02:10:51,044 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:10:51,073 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 02:10:51,074 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 02:10:51,076 INFO L87 Difference]: Start difference. First operand has 13 states, 8 states have (on average 1.5) internal successors, (12), 9 states have internal predecessors, (12), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Second operand has 3 states, 3 states have (on average 2.0) internal successors, (6), 2 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) [2021-11-23 02:10:51,143 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:10:51,143 INFO L93 Difference]: Finished difference Result 25 states and 33 transitions. [2021-11-23 02:10:51,144 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 02:10:51,146 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.0) internal successors, (6), 2 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 [2021-11-23 02:10:51,146 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:10:51,156 INFO L225 Difference]: With dead ends: 25 [2021-11-23 02:10:51,156 INFO L226 Difference]: Without dead ends: 12 [2021-11-23 02:10:51,160 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 02:10:51,164 INFO L933 BasicCegarLoop]: 10 mSDtfsCounter, 0 mSDsluCounter, 11 mSDsCounter, 0 mSdLazyCounter, 10 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 19 SdHoareTripleChecker+Invalid, 10 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 10 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 02:10:51,166 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 19 Invalid, 10 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 10 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 02:10:51,185 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2021-11-23 02:10:51,200 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 12. [2021-11-23 02:10:51,201 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 12 states, 8 states have (on average 1.375) internal successors, (11), 9 states have internal predecessors, (11), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-23 02:10:51,202 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 14 transitions. [2021-11-23 02:10:51,203 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 14 transitions. Word has length 7 [2021-11-23 02:10:51,204 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:10:51,204 INFO L470 AbstractCegarLoop]: Abstraction has 12 states and 14 transitions. [2021-11-23 02:10:51,204 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 2.0) internal successors, (6), 2 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) [2021-11-23 02:10:51,205 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 14 transitions. [2021-11-23 02:10:51,205 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2021-11-23 02:10:51,205 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:10:51,205 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:10:51,206 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-23 02:10:51,206 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:10:51,207 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:10:51,207 INFO L85 PathProgramCache]: Analyzing trace with hash 1962003808, now seen corresponding path program 1 times [2021-11-23 02:10:51,207 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:10:51,208 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1041194734] [2021-11-23 02:10:51,208 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:10:51,208 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:10:51,224 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:10:51,255 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:10:51,256 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:10:51,256 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1041194734] [2021-11-23 02:10:51,256 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1041194734] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:10:51,257 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [404966362] [2021-11-23 02:10:51,257 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:10:51,257 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:10:51,258 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_20fce25a-636c-4f8a-9d1c-fe541eb08a14/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:10:51,259 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_20fce25a-636c-4f8a-9d1c-fe541eb08a14/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:10:51,261 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_20fce25a-636c-4f8a-9d1c-fe541eb08a14/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-23 02:10:51,312 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:10:51,316 INFO L263 TraceCheckSpWp]: Trace formula consists of 44 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 02:10:51,321 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:10:51,470 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:10:51,470 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:10:51,736 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:10:51,737 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [404966362] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-23 02:10:51,737 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-23 02:10:51,737 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [3, 3] total 7 [2021-11-23 02:10:51,738 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [835618505] [2021-11-23 02:10:51,739 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:10:51,739 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 02:10:51,740 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:10:51,740 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 02:10:51,741 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=35, Unknown=0, NotChecked=0, Total=56 [2021-11-23 02:10:51,741 INFO L87 Difference]: Start difference. First operand 12 states and 14 transitions. Second operand has 4 states, 4 states have (on average 1.75) internal successors, (7), 3 states have internal predecessors, (7), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:10:51,771 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:10:51,772 INFO L93 Difference]: Finished difference Result 21 states and 24 transitions. [2021-11-23 02:10:51,772 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 02:10:51,773 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 1.75) internal successors, (7), 3 states have internal predecessors, (7), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 8 [2021-11-23 02:10:51,773 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:10:51,774 INFO L225 Difference]: With dead ends: 21 [2021-11-23 02:10:51,774 INFO L226 Difference]: Without dead ends: 13 [2021-11-23 02:10:51,775 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 11 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=21, Invalid=35, Unknown=0, NotChecked=0, Total=56 [2021-11-23 02:10:51,777 INFO L933 BasicCegarLoop]: 8 mSDtfsCounter, 1 mSDsluCounter, 8 mSDsCounter, 0 mSdLazyCounter, 7 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 16 SdHoareTripleChecker+Invalid, 9 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 7 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 02:10:51,778 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1 Valid, 16 Invalid, 9 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 7 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 02:10:51,779 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2021-11-23 02:10:51,796 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2021-11-23 02:10:51,796 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 13 states, 9 states have (on average 1.3333333333333333) internal successors, (12), 10 states have internal predecessors, (12), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-23 02:10:51,797 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 15 transitions. [2021-11-23 02:10:51,797 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 15 transitions. Word has length 8 [2021-11-23 02:10:51,798 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:10:51,798 INFO L470 AbstractCegarLoop]: Abstraction has 13 states and 15 transitions. [2021-11-23 02:10:51,798 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 1.75) internal successors, (7), 3 states have internal predecessors, (7), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:10:51,798 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 15 transitions. [2021-11-23 02:10:51,799 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2021-11-23 02:10:51,799 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:10:51,799 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:10:51,844 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_20fce25a-636c-4f8a-9d1c-fe541eb08a14/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-23 02:10:52,000 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_20fce25a-636c-4f8a-9d1c-fe541eb08a14/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:10:52,000 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:10:52,001 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:10:52,001 INFO L85 PathProgramCache]: Analyzing trace with hash -185367768, now seen corresponding path program 1 times [2021-11-23 02:10:52,001 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:10:52,002 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [205417576] [2021-11-23 02:10:52,002 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:10:52,002 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:10:52,013 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:10:52,036 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 02:10:52,037 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:10:52,037 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [205417576] [2021-11-23 02:10:52,037 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [205417576] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:10:52,038 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1861020652] [2021-11-23 02:10:52,038 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:10:52,038 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:10:52,038 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_20fce25a-636c-4f8a-9d1c-fe541eb08a14/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:10:52,039 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_20fce25a-636c-4f8a-9d1c-fe541eb08a14/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:10:52,060 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_20fce25a-636c-4f8a-9d1c-fe541eb08a14/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-23 02:10:52,087 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:10:52,091 INFO L263 TraceCheckSpWp]: Trace formula consists of 51 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-23 02:10:52,092 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:10:52,150 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 02:10:52,151 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:10:52,259 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 02:10:52,261 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1861020652] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:10:52,262 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1136330534] [2021-11-23 02:10:52,292 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-23 02:10:52,292 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:10:52,301 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:10:52,307 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:10:52,308 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:10:52,919 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 26 for LOIs [2021-11-23 02:10:52,954 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:10:53,112 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '223#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-23 02:10:53,113 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:10:53,113 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:10:53,113 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3, 3] total 6 [2021-11-23 02:10:53,113 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [751634167] [2021-11-23 02:10:53,113 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:10:53,114 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-23 02:10:53,114 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:10:53,115 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-23 02:10:53,115 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=118, Unknown=0, NotChecked=0, Total=156 [2021-11-23 02:10:53,116 INFO L87 Difference]: Start difference. First operand 13 states and 15 transitions. Second operand has 7 states, 7 states have (on average 1.8571428571428572) internal successors, (13), 6 states have internal predecessors, (13), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:10:53,137 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:10:53,137 INFO L93 Difference]: Finished difference Result 26 states and 32 transitions. [2021-11-23 02:10:53,137 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-23 02:10:53,138 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 1.8571428571428572) internal successors, (13), 6 states have internal predecessors, (13), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 9 [2021-11-23 02:10:53,138 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:10:53,139 INFO L225 Difference]: With dead ends: 26 [2021-11-23 02:10:53,139 INFO L226 Difference]: Without dead ends: 16 [2021-11-23 02:10:53,140 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 17 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 45 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=38, Invalid=118, Unknown=0, NotChecked=0, Total=156 [2021-11-23 02:10:53,141 INFO L933 BasicCegarLoop]: 9 mSDtfsCounter, 0 mSDsluCounter, 18 mSDsCounter, 0 mSdLazyCounter, 15 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 25 SdHoareTripleChecker+Invalid, 18 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 15 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 02:10:53,142 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 25 Invalid, 18 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 15 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 02:10:53,143 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2021-11-23 02:10:53,146 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2021-11-23 02:10:53,146 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 16 states, 12 states have (on average 1.25) internal successors, (15), 13 states have internal predecessors, (15), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-23 02:10:53,147 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 18 transitions. [2021-11-23 02:10:53,147 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 18 transitions. Word has length 9 [2021-11-23 02:10:53,147 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:10:53,148 INFO L470 AbstractCegarLoop]: Abstraction has 16 states and 18 transitions. [2021-11-23 02:10:53,148 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 1.8571428571428572) internal successors, (13), 6 states have internal predecessors, (13), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:10:53,148 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 18 transitions. [2021-11-23 02:10:53,149 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-11-23 02:10:53,149 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:10:53,149 INFO L514 BasicCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:10:53,186 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_20fce25a-636c-4f8a-9d1c-fe541eb08a14/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-23 02:10:53,366 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_20fce25a-636c-4f8a-9d1c-fe541eb08a14/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:10:53,366 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:10:53,367 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:10:53,367 INFO L85 PathProgramCache]: Analyzing trace with hash -2134990598, now seen corresponding path program 2 times [2021-11-23 02:10:53,367 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:10:53,367 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1454428947] [2021-11-23 02:10:53,367 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:10:53,368 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:10:53,413 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:10:53,523 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 11 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:10:53,525 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:10:53,530 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1454428947] [2021-11-23 02:10:53,530 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1454428947] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:10:53,531 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [303341584] [2021-11-23 02:10:53,532 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 02:10:53,532 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:10:53,533 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_20fce25a-636c-4f8a-9d1c-fe541eb08a14/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:10:53,538 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_20fce25a-636c-4f8a-9d1c-fe541eb08a14/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:10:53,555 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_20fce25a-636c-4f8a-9d1c-fe541eb08a14/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-23 02:10:53,582 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-11-23 02:10:53,583 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:10:53,584 INFO L263 TraceCheckSpWp]: Trace formula consists of 57 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 02:10:53,585 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:10:53,665 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 02:10:53,665 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:10:54,030 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 11 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:10:54,030 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [303341584] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:10:54,030 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1466689584] [2021-11-23 02:10:54,038 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-23 02:10:54,038 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:10:54,039 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:10:54,040 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:10:54,040 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:10:54,349 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 26 for LOIs [2021-11-23 02:10:54,374 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:10:54,552 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '373#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-23 02:10:54,552 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:10:54,553 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:10:54,553 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6, 8] total 16 [2021-11-23 02:10:54,553 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [78805133] [2021-11-23 02:10:54,553 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:10:54,554 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2021-11-23 02:10:54,554 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:10:54,554 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-11-23 02:10:54,555 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=150, Invalid=356, Unknown=0, NotChecked=0, Total=506 [2021-11-23 02:10:54,555 INFO L87 Difference]: Start difference. First operand 16 states and 18 transitions. Second operand has 17 states, 17 states have (on average 1.4705882352941178) internal successors, (25), 16 states have internal predecessors, (25), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:10:54,619 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:10:54,619 INFO L93 Difference]: Finished difference Result 30 states and 37 transitions. [2021-11-23 02:10:54,620 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-23 02:10:54,620 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 1.4705882352941178) internal successors, (25), 16 states have internal predecessors, (25), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 12 [2021-11-23 02:10:54,621 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:10:54,621 INFO L225 Difference]: With dead ends: 30 [2021-11-23 02:10:54,621 INFO L226 Difference]: Without dead ends: 20 [2021-11-23 02:10:54,622 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 165 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=150, Invalid=356, Unknown=0, NotChecked=0, Total=506 [2021-11-23 02:10:54,623 INFO L933 BasicCegarLoop]: 8 mSDtfsCounter, 4 mSDsluCounter, 35 mSDsCounter, 0 mSdLazyCounter, 28 mSolverCounterSat, 28 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 43 SdHoareTripleChecker+Invalid, 56 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 28 IncrementalHoareTripleChecker+Valid, 28 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:10:54,624 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [5 Valid, 43 Invalid, 56 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [28 Valid, 28 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 02:10:54,625 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2021-11-23 02:10:54,627 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2021-11-23 02:10:54,628 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20 states, 16 states have (on average 1.1875) internal successors, (19), 17 states have internal predecessors, (19), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-23 02:10:54,628 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 22 transitions. [2021-11-23 02:10:54,629 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 22 transitions. Word has length 12 [2021-11-23 02:10:54,629 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:10:54,629 INFO L470 AbstractCegarLoop]: Abstraction has 20 states and 22 transitions. [2021-11-23 02:10:54,629 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 17 states have (on average 1.4705882352941178) internal successors, (25), 16 states have internal predecessors, (25), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:10:54,630 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 22 transitions. [2021-11-23 02:10:54,630 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2021-11-23 02:10:54,630 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:10:54,630 INFO L514 BasicCegarLoop]: trace histogram [5, 4, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:10:54,668 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_20fce25a-636c-4f8a-9d1c-fe541eb08a14/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-23 02:10:54,844 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_20fce25a-636c-4f8a-9d1c-fe541eb08a14/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:10:54,845 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:10:54,845 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:10:54,845 INFO L85 PathProgramCache]: Analyzing trace with hash 269236960, now seen corresponding path program 3 times [2021-11-23 02:10:54,845 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:10:54,845 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1638817058] [2021-11-23 02:10:54,845 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:10:54,846 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:10:54,887 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:10:55,005 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:10:55,005 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:10:55,006 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1638817058] [2021-11-23 02:10:55,007 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1638817058] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:10:55,007 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1337722042] [2021-11-23 02:10:55,007 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-23 02:10:55,007 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:10:55,008 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_20fce25a-636c-4f8a-9d1c-fe541eb08a14/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:10:55,012 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_20fce25a-636c-4f8a-9d1c-fe541eb08a14/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:10:55,020 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_20fce25a-636c-4f8a-9d1c-fe541eb08a14/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-23 02:10:55,053 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-23 02:10:55,054 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:10:55,055 INFO L263 TraceCheckSpWp]: Trace formula consists of 80 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-23 02:10:55,056 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:10:55,153 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-23 02:10:55,153 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:10:55,465 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-23 02:10:55,465 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1337722042] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:10:55,465 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1565993049] [2021-11-23 02:10:55,468 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-23 02:10:55,468 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:10:55,468 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:10:55,468 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:10:55,469 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:10:55,718 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 26 for LOIs [2021-11-23 02:10:55,735 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:10:55,898 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '564#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-23 02:10:55,898 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:10:55,898 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:10:55,898 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 7, 7] total 23 [2021-11-23 02:10:55,899 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [946066868] [2021-11-23 02:10:55,899 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:10:55,899 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2021-11-23 02:10:55,899 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:10:55,900 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-11-23 02:10:55,901 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=228, Invalid=642, Unknown=0, NotChecked=0, Total=870 [2021-11-23 02:10:55,901 INFO L87 Difference]: Start difference. First operand 20 states and 22 transitions. Second operand has 24 states, 24 states have (on average 1.2916666666666667) internal successors, (31), 23 states have internal predecessors, (31), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:10:56,097 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:10:56,098 INFO L93 Difference]: Finished difference Result 41 states and 52 transitions. [2021-11-23 02:10:56,098 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-11-23 02:10:56,099 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 1.2916666666666667) internal successors, (31), 23 states have internal predecessors, (31), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 16 [2021-11-23 02:10:56,099 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:10:56,099 INFO L225 Difference]: With dead ends: 41 [2021-11-23 02:10:56,099 INFO L226 Difference]: Without dead ends: 28 [2021-11-23 02:10:56,100 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 64 GetRequests, 29 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 272 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=361, Invalid=971, Unknown=0, NotChecked=0, Total=1332 [2021-11-23 02:10:56,101 INFO L933 BasicCegarLoop]: 8 mSDtfsCounter, 2 mSDsluCounter, 49 mSDsCounter, 0 mSdLazyCounter, 35 mSolverCounterSat, 30 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 56 SdHoareTripleChecker+Invalid, 65 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 30 IncrementalHoareTripleChecker+Valid, 35 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:10:56,102 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 56 Invalid, 65 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [30 Valid, 35 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 02:10:56,102 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2021-11-23 02:10:56,105 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2021-11-23 02:10:56,106 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28 states, 24 states have (on average 1.125) internal successors, (27), 25 states have internal predecessors, (27), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-23 02:10:56,107 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 30 transitions. [2021-11-23 02:10:56,107 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 30 transitions. Word has length 16 [2021-11-23 02:10:56,107 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:10:56,107 INFO L470 AbstractCegarLoop]: Abstraction has 28 states and 30 transitions. [2021-11-23 02:10:56,107 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 24 states have (on average 1.2916666666666667) internal successors, (31), 23 states have internal predecessors, (31), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:10:56,107 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 30 transitions. [2021-11-23 02:10:56,108 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-11-23 02:10:56,109 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:10:56,109 INFO L514 BasicCegarLoop]: trace histogram [12, 5, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:10:56,146 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_20fce25a-636c-4f8a-9d1c-fe541eb08a14/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-23 02:10:56,332 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_20fce25a-636c-4f8a-9d1c-fe541eb08a14/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:10:56,333 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:10:56,333 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:10:56,333 INFO L85 PathProgramCache]: Analyzing trace with hash -51663622, now seen corresponding path program 4 times [2021-11-23 02:10:56,333 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:10:56,333 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [51572391] [2021-11-23 02:10:56,333 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:10:56,333 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:10:56,370 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:10:56,671 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 0 proven. 93 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:10:56,672 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:10:56,672 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [51572391] [2021-11-23 02:10:56,672 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [51572391] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:10:56,672 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1638186265] [2021-11-23 02:10:56,672 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-23 02:10:56,672 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:10:56,672 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_20fce25a-636c-4f8a-9d1c-fe541eb08a14/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:10:56,673 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_20fce25a-636c-4f8a-9d1c-fe541eb08a14/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:10:56,676 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_20fce25a-636c-4f8a-9d1c-fe541eb08a14/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-23 02:10:56,719 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:10:56,720 INFO L263 TraceCheckSpWp]: Trace formula consists of 101 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-23 02:10:56,722 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:10:57,057 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-23 02:10:57,057 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:10:57,810 INFO L134 CoverageAnalysis]: Checked inductivity of 93 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-23 02:10:57,811 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1638186265] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:10:57,811 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [588005901] [2021-11-23 02:10:57,815 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-23 02:10:57,815 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:10:57,815 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:10:57,815 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:10:57,816 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:10:58,053 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 26 for LOIs [2021-11-23 02:10:58,070 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:10:58,301 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '872#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-23 02:10:58,302 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:10:58,302 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:10:58,302 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 14, 14] total 45 [2021-11-23 02:10:58,302 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1130703021] [2021-11-23 02:10:58,302 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:10:58,303 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 46 states [2021-11-23 02:10:58,303 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:10:58,304 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2021-11-23 02:10:58,305 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=836, Invalid=1816, Unknown=0, NotChecked=0, Total=2652 [2021-11-23 02:10:58,306 INFO L87 Difference]: Start difference. First operand 28 states and 30 transitions. Second operand has 46 states, 46 states have (on average 1.1521739130434783) internal successors, (53), 45 states have internal predecessors, (53), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:10:58,818 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:10:58,818 INFO L93 Difference]: Finished difference Result 57 states and 75 transitions. [2021-11-23 02:10:58,819 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2021-11-23 02:10:58,819 INFO L78 Accepts]: Start accepts. Automaton has has 46 states, 46 states have (on average 1.1521739130434783) internal successors, (53), 45 states have internal predecessors, (53), 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 24 [2021-11-23 02:10:58,820 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:10:58,821 INFO L225 Difference]: With dead ends: 57 [2021-11-23 02:10:58,821 INFO L226 Difference]: Without dead ends: 43 [2021-11-23 02:10:58,823 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 103 GetRequests, 39 SyntacticMatches, 0 SemanticMatches, 64 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 725 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=1312, Invalid=2978, Unknown=0, NotChecked=0, Total=4290 [2021-11-23 02:10:58,824 INFO L933 BasicCegarLoop]: 8 mSDtfsCounter, 4 mSDsluCounter, 88 mSDsCounter, 0 mSdLazyCounter, 70 mSolverCounterSat, 96 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4 SdHoareTripleChecker+Valid, 88 SdHoareTripleChecker+Invalid, 166 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 96 IncrementalHoareTripleChecker+Valid, 70 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:10:58,825 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [4 Valid, 88 Invalid, 166 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [96 Valid, 70 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 02:10:58,826 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2021-11-23 02:10:58,831 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 43. [2021-11-23 02:10:58,832 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 43 states, 39 states have (on average 1.0769230769230769) internal successors, (42), 40 states have internal predecessors, (42), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-23 02:10:58,833 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 45 transitions. [2021-11-23 02:10:58,833 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 45 transitions. Word has length 24 [2021-11-23 02:10:58,833 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:10:58,833 INFO L470 AbstractCegarLoop]: Abstraction has 43 states and 45 transitions. [2021-11-23 02:10:58,834 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 46 states, 46 states have (on average 1.1521739130434783) internal successors, (53), 45 states have internal predecessors, (53), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:10:58,834 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 45 transitions. [2021-11-23 02:10:58,835 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2021-11-23 02:10:58,835 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:10:58,835 INFO L514 BasicCegarLoop]: trace histogram [26, 6, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:10:58,873 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_20fce25a-636c-4f8a-9d1c-fe541eb08a14/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-23 02:10:59,056 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_20fce25a-636c-4f8a-9d1c-fe541eb08a14/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:10:59,057 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:10:59,057 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:10:59,057 INFO L85 PathProgramCache]: Analyzing trace with hash -2051516786, now seen corresponding path program 5 times [2021-11-23 02:10:59,057 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:10:59,057 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [124467691] [2021-11-23 02:10:59,058 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:10:59,058 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:10:59,140 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:10:59,980 INFO L134 CoverageAnalysis]: Checked inductivity of 372 backedges. 0 proven. 372 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:10:59,980 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:10:59,980 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [124467691] [2021-11-23 02:10:59,980 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [124467691] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:10:59,980 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1305191072] [2021-11-23 02:10:59,980 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 02:10:59,980 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:10:59,981 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_20fce25a-636c-4f8a-9d1c-fe541eb08a14/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:10:59,981 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_20fce25a-636c-4f8a-9d1c-fe541eb08a14/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:11:00,005 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_20fce25a-636c-4f8a-9d1c-fe541eb08a14/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-23 02:11:00,039 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-11-23 02:11:00,039 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:11:00,041 INFO L263 TraceCheckSpWp]: Trace formula consists of 96 conjuncts, 17 conjunts are in the unsatisfiable core [2021-11-23 02:11:00,043 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:11:00,298 INFO L134 CoverageAnalysis]: Checked inductivity of 372 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 351 trivial. 0 not checked. [2021-11-23 02:11:00,299 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:11:00,503 INFO L134 CoverageAnalysis]: Checked inductivity of 372 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 360 trivial. 0 not checked. [2021-11-23 02:11:00,503 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1305191072] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:11:00,503 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1771920331] [2021-11-23 02:11:00,505 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-23 02:11:00,505 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:11:00,505 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:11:00,506 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:11:00,506 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:11:00,735 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 26 for LOIs [2021-11-23 02:11:00,751 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:11:01,069 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1343#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-23 02:11:01,069 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:11:01,070 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:11:01,070 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 10, 5] total 45 [2021-11-23 02:11:01,070 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1521090167] [2021-11-23 02:11:01,070 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:11:01,071 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 46 states [2021-11-23 02:11:01,071 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:11:01,071 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2021-11-23 02:11:01,074 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=650, Invalid=2002, Unknown=0, NotChecked=0, Total=2652 [2021-11-23 02:11:01,075 INFO L87 Difference]: Start difference. First operand 43 states and 45 transitions. Second operand has 46 states, 46 states have (on average 1.2173913043478262) internal successors, (56), 44 states have internal predecessors, (56), 3 states have call successors, (3), 2 states have call predecessors, (3), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:11:02,126 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:11:02,127 INFO L93 Difference]: Finished difference Result 59 states and 64 transitions. [2021-11-23 02:11:02,129 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2021-11-23 02:11:02,130 INFO L78 Accepts]: Start accepts. Automaton has has 46 states, 46 states have (on average 1.2173913043478262) internal successors, (56), 44 states have internal predecessors, (56), 3 states have call successors, (3), 2 states have call predecessors, (3), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 39 [2021-11-23 02:11:02,130 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:11:02,131 INFO L225 Difference]: With dead ends: 59 [2021-11-23 02:11:02,131 INFO L226 Difference]: Without dead ends: 51 [2021-11-23 02:11:02,134 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 183 GetRequests, 98 SyntacticMatches, 1 SemanticMatches, 84 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1241 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=1699, Invalid=5611, Unknown=0, NotChecked=0, Total=7310 [2021-11-23 02:11:02,135 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 8 mSDsluCounter, 142 mSDsCounter, 0 mSdLazyCounter, 215 mSolverCounterSat, 59 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 126 SdHoareTripleChecker+Invalid, 274 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 59 IncrementalHoareTripleChecker+Valid, 215 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 02:11:02,136 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [10 Valid, 126 Invalid, 274 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [59 Valid, 215 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-23 02:11:02,139 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2021-11-23 02:11:02,146 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 50. [2021-11-23 02:11:02,148 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 50 states, 44 states have (on average 1.0909090909090908) internal successors, (48), 46 states have internal predecessors, (48), 3 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-23 02:11:02,149 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 53 transitions. [2021-11-23 02:11:02,149 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 53 transitions. Word has length 39 [2021-11-23 02:11:02,150 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:11:02,150 INFO L470 AbstractCegarLoop]: Abstraction has 50 states and 53 transitions. [2021-11-23 02:11:02,151 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 46 states, 46 states have (on average 1.2173913043478262) internal successors, (56), 44 states have internal predecessors, (56), 3 states have call successors, (3), 2 states have call predecessors, (3), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:11:02,151 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 53 transitions. [2021-11-23 02:11:02,155 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2021-11-23 02:11:02,155 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:11:02,155 INFO L514 BasicCegarLoop]: trace histogram [26, 7, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:11:02,193 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_20fce25a-636c-4f8a-9d1c-fe541eb08a14/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-23 02:11:02,372 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_20fce25a-636c-4f8a-9d1c-fe541eb08a14/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:11:02,373 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:11:02,373 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:11:02,373 INFO L85 PathProgramCache]: Analyzing trace with hash -50454598, now seen corresponding path program 6 times [2021-11-23 02:11:02,373 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:11:02,373 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2056768449] [2021-11-23 02:11:02,373 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:11:02,373 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:11:02,440 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:11:03,285 INFO L134 CoverageAnalysis]: Checked inductivity of 379 backedges. 0 proven. 379 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:11:03,285 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:11:03,286 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2056768449] [2021-11-23 02:11:03,286 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2056768449] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:11:03,286 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [782263203] [2021-11-23 02:11:03,286 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-23 02:11:03,286 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:11:03,286 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_20fce25a-636c-4f8a-9d1c-fe541eb08a14/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:11:03,289 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_20fce25a-636c-4f8a-9d1c-fe541eb08a14/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:11:03,311 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_20fce25a-636c-4f8a-9d1c-fe541eb08a14/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-23 02:11:03,359 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-23 02:11:03,359 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:11:03,361 INFO L263 TraceCheckSpWp]: Trace formula consists of 143 conjuncts, 28 conjunts are in the unsatisfiable core [2021-11-23 02:11:03,365 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:11:04,450 INFO L134 CoverageAnalysis]: Checked inductivity of 379 backedges. 0 proven. 351 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-11-23 02:11:04,451 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:11:06,872 INFO L134 CoverageAnalysis]: Checked inductivity of 379 backedges. 0 proven. 351 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-11-23 02:11:06,872 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [782263203] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:11:06,872 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [60674847] [2021-11-23 02:11:06,875 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-23 02:11:06,875 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:11:06,875 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:11:06,875 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:11:06,875 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:11:07,104 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 34 for LOIs [2021-11-23 02:11:07,166 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:11:07,553 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1918#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (exists ((|v_ULTIMATE.start_main_~z~0#1_BEFORE_CALL_7| Int)) (and (<= 0 |v_ULTIMATE.start_main_~z~0#1_BEFORE_CALL_7|) (or (and (= |#NULL.offset| 0) (= |#NULL.base| 0)) (and (= |v_ULTIMATE.start_main_~z~0#1_BEFORE_CALL_7| 1) (= |#NULL.offset| 0) (= |#NULL.base| 0))) (= |__VERIFIER_assert_#in~cond| (ite (= (ite (and (< |v_ULTIMATE.start_main_~z~0#1_BEFORE_CALL_7| 0) (not (= (mod |v_ULTIMATE.start_main_~z~0#1_BEFORE_CALL_7| 2) 0))) (+ (mod |v_ULTIMATE.start_main_~z~0#1_BEFORE_CALL_7| 2) (- 2)) (mod |v_ULTIMATE.start_main_~z~0#1_BEFORE_CALL_7| 2)) 0) 1 0)))) (<= 0 |#StackHeapBarrier|))' at error location [2021-11-23 02:11:07,554 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:11:07,554 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:11:07,554 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 28, 28] total 89 [2021-11-23 02:11:07,554 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2019678364] [2021-11-23 02:11:07,554 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:11:07,554 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 90 states [2021-11-23 02:11:07,555 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:11:07,556 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 90 interpolants. [2021-11-23 02:11:07,558 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3273, Invalid=5847, Unknown=0, NotChecked=0, Total=9120 [2021-11-23 02:11:07,559 INFO L87 Difference]: Start difference. First operand 50 states and 53 transitions. Second operand has 90 states, 90 states have (on average 1.0777777777777777) internal successors, (97), 89 states have internal predecessors, (97), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:11:08,965 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:11:08,965 INFO L93 Difference]: Finished difference Result 101 states and 135 transitions. [2021-11-23 02:11:08,972 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 64 states. [2021-11-23 02:11:08,973 INFO L78 Accepts]: Start accepts. Automaton has has 90 states, 90 states have (on average 1.0777777777777777) internal successors, (97), 89 states have internal predecessors, (97), 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 40 [2021-11-23 02:11:08,973 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:11:08,975 INFO L225 Difference]: With dead ends: 101 [2021-11-23 02:11:08,975 INFO L226 Difference]: Without dead ends: 79 [2021-11-23 02:11:08,981 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 181 GetRequests, 59 SyntacticMatches, 0 SemanticMatches, 122 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2156 ImplicationChecksByTransitivity, 4.6s TimeCoverageRelationStatistics Valid=5065, Invalid=10187, Unknown=0, NotChecked=0, Total=15252 [2021-11-23 02:11:08,982 INFO L933 BasicCegarLoop]: 8 mSDtfsCounter, 2 mSDsluCounter, 68 mSDsCounter, 0 mSdLazyCounter, 94 mSolverCounterSat, 145 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 72 SdHoareTripleChecker+Invalid, 239 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 145 IncrementalHoareTripleChecker+Valid, 94 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 02:11:08,982 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 72 Invalid, 239 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [145 Valid, 94 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-23 02:11:08,983 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2021-11-23 02:11:08,991 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 79. [2021-11-23 02:11:08,992 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 79 states, 73 states have (on average 1.0547945205479452) internal successors, (77), 75 states have internal predecessors, (77), 3 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-23 02:11:08,993 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 82 transitions. [2021-11-23 02:11:08,993 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 82 transitions. Word has length 40 [2021-11-23 02:11:08,994 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:11:08,994 INFO L470 AbstractCegarLoop]: Abstraction has 79 states and 82 transitions. [2021-11-23 02:11:08,994 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 90 states, 90 states have (on average 1.0777777777777777) internal successors, (97), 89 states have internal predecessors, (97), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:11:08,994 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 82 transitions. [2021-11-23 02:11:08,995 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2021-11-23 02:11:08,995 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:11:08,996 INFO L514 BasicCegarLoop]: trace histogram [54, 9, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:11:09,017 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_20fce25a-636c-4f8a-9d1c-fe541eb08a14/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-11-23 02:11:09,196 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_20fce25a-636c-4f8a-9d1c-fe541eb08a14/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:11:09,196 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:11:09,197 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:11:09,197 INFO L85 PathProgramCache]: Analyzing trace with hash -1520719174, now seen corresponding path program 7 times [2021-11-23 02:11:09,197 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:11:09,197 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [23846486] [2021-11-23 02:11:09,197 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:11:09,197 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:11:09,286 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:11:11,254 INFO L134 CoverageAnalysis]: Checked inductivity of 1530 backedges. 0 proven. 1530 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:11:11,254 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:11:11,255 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [23846486] [2021-11-23 02:11:11,255 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [23846486] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:11:11,255 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [886180515] [2021-11-23 02:11:11,255 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-23 02:11:11,255 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:11:11,256 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_20fce25a-636c-4f8a-9d1c-fe541eb08a14/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:11:11,258 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_20fce25a-636c-4f8a-9d1c-fe541eb08a14/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:11:11,259 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_20fce25a-636c-4f8a-9d1c-fe541eb08a14/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-11-23 02:11:11,336 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:11:11,339 INFO L263 TraceCheckSpWp]: Trace formula consists of 213 conjuncts, 56 conjunts are in the unsatisfiable core [2021-11-23 02:11:11,346 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:11:14,452 INFO L134 CoverageAnalysis]: Checked inductivity of 1530 backedges. 0 proven. 1485 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2021-11-23 02:11:14,453 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:11:22,231 INFO L134 CoverageAnalysis]: Checked inductivity of 1530 backedges. 0 proven. 1485 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2021-11-23 02:11:22,232 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [886180515] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:11:22,232 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [924417224] [2021-11-23 02:11:22,234 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-23 02:11:22,235 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:11:22,235 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:11:22,235 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:11:22,236 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:11:22,483 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 26 for LOIs [2021-11-23 02:11:22,496 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:11:22,978 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2875#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-23 02:11:22,978 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:11:22,978 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:11:22,978 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [65, 56, 56] total 175 [2021-11-23 02:11:22,978 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1394656131] [2021-11-23 02:11:22,979 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:11:22,979 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 176 states [2021-11-23 02:11:22,980 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:11:22,984 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 176 interpolants. [2021-11-23 02:11:22,994 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12896, Invalid=20046, Unknown=0, NotChecked=0, Total=32942 [2021-11-23 02:11:22,995 INFO L87 Difference]: Start difference. First operand 79 states and 82 transitions. Second operand has 176 states, 176 states have (on average 1.0397727272727273) internal successors, (183), 175 states have internal predecessors, (183), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:11:27,540 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:11:27,541 INFO L93 Difference]: Finished difference Result 160 states and 223 transitions. [2021-11-23 02:11:27,541 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 122 states. [2021-11-23 02:11:27,542 INFO L78 Accepts]: Start accepts. Automaton has has 176 states, 176 states have (on average 1.0397727272727273) internal successors, (183), 175 states have internal predecessors, (183), 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 70 [2021-11-23 02:11:27,542 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:11:27,543 INFO L225 Difference]: With dead ends: 160 [2021-11-23 02:11:27,543 INFO L226 Difference]: Without dead ends: 137 [2021-11-23 02:11:27,549 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 329 GetRequests, 93 SyntacticMatches, 0 SemanticMatches, 236 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6884 ImplicationChecksByTransitivity, 14.9s TimeCoverageRelationStatistics Valid=19728, Invalid=36678, Unknown=0, NotChecked=0, Total=56406 [2021-11-23 02:11:27,550 INFO L933 BasicCegarLoop]: 8 mSDtfsCounter, 3 mSDsluCounter, 60 mSDsCounter, 0 mSdLazyCounter, 166 mSolverCounterSat, 451 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 64 SdHoareTripleChecker+Invalid, 617 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 451 IncrementalHoareTripleChecker+Valid, 166 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-23 02:11:27,551 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3 Valid, 64 Invalid, 617 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [451 Valid, 166 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-23 02:11:27,551 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 137 states. [2021-11-23 02:11:27,564 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 137 to 137. [2021-11-23 02:11:27,564 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 137 states, 131 states have (on average 1.0305343511450382) internal successors, (135), 133 states have internal predecessors, (135), 3 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-23 02:11:27,566 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 137 states to 137 states and 140 transitions. [2021-11-23 02:11:27,567 INFO L78 Accepts]: Start accepts. Automaton has 137 states and 140 transitions. Word has length 70 [2021-11-23 02:11:27,567 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:11:27,567 INFO L470 AbstractCegarLoop]: Abstraction has 137 states and 140 transitions. [2021-11-23 02:11:27,568 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 176 states, 176 states have (on average 1.0397727272727273) internal successors, (183), 175 states have internal predecessors, (183), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:11:27,568 INFO L276 IsEmpty]: Start isEmpty. Operand 137 states and 140 transitions. [2021-11-23 02:11:27,570 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 129 [2021-11-23 02:11:27,570 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:11:27,571 INFO L514 BasicCegarLoop]: trace histogram [110, 11, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:11:27,592 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_20fce25a-636c-4f8a-9d1c-fe541eb08a14/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-11-23 02:11:27,772 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_20fce25a-636c-4f8a-9d1c-fe541eb08a14/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable8 [2021-11-23 02:11:27,773 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:11:27,773 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:11:27,773 INFO L85 PathProgramCache]: Analyzing trace with hash -809568710, now seen corresponding path program 8 times [2021-11-23 02:11:27,773 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:11:27,774 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2044113947] [2021-11-23 02:11:27,778 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:11:27,778 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:11:27,949 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:11:34,326 INFO L134 CoverageAnalysis]: Checked inductivity of 6171 backedges. 0 proven. 6171 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:11:34,327 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:11:34,327 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2044113947] [2021-11-23 02:11:34,327 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2044113947] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:11:34,327 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2115433543] [2021-11-23 02:11:34,327 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 02:11:34,327 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:11:34,327 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_20fce25a-636c-4f8a-9d1c-fe541eb08a14/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:11:34,328 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_20fce25a-636c-4f8a-9d1c-fe541eb08a14/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:11:34,329 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_20fce25a-636c-4f8a-9d1c-fe541eb08a14/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-11-23 02:11:34,691 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 56 check-sat command(s) [2021-11-23 02:11:34,691 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:11:34,697 INFO L263 TraceCheckSpWp]: Trace formula consists of 339 conjuncts, 112 conjunts are in the unsatisfiable core [2021-11-23 02:11:34,715 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:11:46,517 INFO L134 CoverageAnalysis]: Checked inductivity of 6171 backedges. 0 proven. 6105 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2021-11-23 02:11:46,517 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:12:11,234 INFO L134 CoverageAnalysis]: Checked inductivity of 6171 backedges. 0 proven. 6105 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2021-11-23 02:12:11,234 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2115433543] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:12:11,234 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1746365186] [2021-11-23 02:12:11,236 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-23 02:12:11,237 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:12:11,237 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:12:11,237 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:12:11,238 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:12:11,461 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 26 for LOIs [2021-11-23 02:12:11,477 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:12:12,440 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4635#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-23 02:12:12,440 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:12:12,441 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:12:12,441 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [123, 112, 112] total 345 [2021-11-23 02:12:12,441 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [749133617] [2021-11-23 02:12:12,441 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:12:12,442 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 346 states [2021-11-23 02:12:12,442 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:12:12,458 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 346 interpolants. [2021-11-23 02:12:12,470 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=51055, Invalid=72497, Unknown=0, NotChecked=0, Total=123552 [2021-11-23 02:12:12,471 INFO L87 Difference]: Start difference. First operand 137 states and 140 transitions. Second operand has 346 states, 346 states have (on average 1.0202312138728324) internal successors, (353), 345 states have internal predecessors, (353), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:12:31,431 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:12:31,432 INFO L93 Difference]: Finished difference Result 276 states and 395 transitions. [2021-11-23 02:12:31,432 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 236 states. [2021-11-23 02:12:31,433 INFO L78 Accepts]: Start accepts. Automaton has has 346 states, 346 states have (on average 1.0202312138728324) internal successors, (353), 345 states have internal predecessors, (353), 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 128 [2021-11-23 02:12:31,434 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:12:31,436 INFO L225 Difference]: With dead ends: 276 [2021-11-23 02:12:31,436 INFO L226 Difference]: Without dead ends: 251 [2021-11-23 02:12:31,452 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 617 GetRequests, 155 SyntacticMatches, 0 SemanticMatches, 462 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23610 ImplicationChecksByTransitivity, 56.9s TimeCoverageRelationStatistics Valid=77487, Invalid=137345, Unknown=0, NotChecked=0, Total=214832 [2021-11-23 02:12:31,453 INFO L933 BasicCegarLoop]: 8 mSDtfsCounter, 2 mSDsluCounter, 75 mSDsCounter, 0 mSdLazyCounter, 313 mSolverCounterSat, 673 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 80 SdHoareTripleChecker+Invalid, 986 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 673 IncrementalHoareTripleChecker+Valid, 313 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-23 02:12:31,453 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 80 Invalid, 986 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [673 Valid, 313 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2021-11-23 02:12:31,454 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 251 states. [2021-11-23 02:12:31,483 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 251 to 251. [2021-11-23 02:12:31,485 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 251 states, 245 states have (on average 1.0163265306122449) internal successors, (249), 247 states have internal predecessors, (249), 3 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-23 02:12:31,489 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 251 states to 251 states and 254 transitions. [2021-11-23 02:12:31,489 INFO L78 Accepts]: Start accepts. Automaton has 251 states and 254 transitions. Word has length 128 [2021-11-23 02:12:31,490 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:12:31,490 INFO L470 AbstractCegarLoop]: Abstraction has 251 states and 254 transitions. [2021-11-23 02:12:31,491 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 346 states, 346 states have (on average 1.0202312138728324) internal successors, (353), 345 states have internal predecessors, (353), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:12:31,491 INFO L276 IsEmpty]: Start isEmpty. Operand 251 states and 254 transitions. [2021-11-23 02:12:31,497 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 243 [2021-11-23 02:12:31,497 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:12:31,498 INFO L514 BasicCegarLoop]: trace histogram [222, 13, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:12:31,523 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_20fce25a-636c-4f8a-9d1c-fe541eb08a14/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2021-11-23 02:12:31,700 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_20fce25a-636c-4f8a-9d1c-fe541eb08a14/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:12:31,700 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:12:31,700 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:12:31,701 INFO L85 PathProgramCache]: Analyzing trace with hash 575562426, now seen corresponding path program 9 times [2021-11-23 02:12:31,701 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:12:31,701 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1576379400] [2021-11-23 02:12:31,701 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:12:31,701 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:12:32,271 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:12:56,466 INFO L134 CoverageAnalysis]: Checked inductivity of 24844 backedges. 0 proven. 24844 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:12:56,466 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:12:56,467 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1576379400] [2021-11-23 02:12:56,467 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1576379400] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:12:56,467 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [371572326] [2021-11-23 02:12:56,467 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-23 02:12:56,467 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:12:56,467 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_20fce25a-636c-4f8a-9d1c-fe541eb08a14/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:12:56,468 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_20fce25a-636c-4f8a-9d1c-fe541eb08a14/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:12:56,513 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_20fce25a-636c-4f8a-9d1c-fe541eb08a14/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-11-23 02:12:56,812 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-23 02:12:56,812 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:12:56,826 INFO L263 TraceCheckSpWp]: Trace formula consists of 577 conjuncts, 224 conjunts are in the unsatisfiable core [2021-11-23 02:12:56,845 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:13:44,908 INFO L134 CoverageAnalysis]: Checked inductivity of 24844 backedges. 0 proven. 24753 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2021-11-23 02:13:44,909 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:15:25,725 INFO L134 CoverageAnalysis]: Checked inductivity of 24844 backedges. 0 proven. 24753 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2021-11-23 02:15:25,725 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [371572326] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:15:25,725 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [744940153] [2021-11-23 02:15:25,727 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-23 02:15:25,728 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:15:25,728 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:15:25,728 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:15:25,729 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:15:25,925 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 26 for LOIs [2021-11-23 02:15:25,941 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:15:27,794 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '7983#(and (= |__VERIFIER_assert_#in~cond| __VERIFIER_assert_~cond) (= __VERIFIER_assert_~cond 0) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-23 02:15:27,794 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:15:27,795 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:15:27,795 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [237, 224, 224] total 683 [2021-11-23 02:15:27,795 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [480075150] [2021-11-23 02:15:27,795 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:15:27,798 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 684 states [2021-11-23 02:15:27,798 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:15:27,910 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 684 interpolants. [2021-11-23 02:15:27,938 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=202842, Invalid=272568, Unknown=0, NotChecked=0, Total=475410 [2021-11-23 02:15:27,939 INFO L87 Difference]: Start difference. First operand 251 states and 254 transitions. Second operand has 684 states, 684 states have (on average 1.010233918128655) internal successors, (691), 683 states have internal predecessors, (691), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:16:53,485 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:16:53,485 INFO L93 Difference]: Finished difference Result 504 states and 735 transitions. [2021-11-23 02:16:53,485 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 462 states. [2021-11-23 02:16:53,486 INFO L78 Accepts]: Start accepts. Automaton has has 684 states, 684 states have (on average 1.010233918128655) internal successors, (691), 683 states have internal predecessors, (691), 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 242 [2021-11-23 02:16:53,487 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:16:53,490 INFO L225 Difference]: With dead ends: 504 [2021-11-23 02:16:53,490 INFO L226 Difference]: Without dead ends: 477 [2021-11-23 02:16:53,548 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1185 GetRequests, 273 SyntacticMatches, 0 SemanticMatches, 912 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 85724 ImplicationChecksByTransitivity, 238.9s TimeCoverageRelationStatistics Valid=306330, Invalid=528152, Unknown=0, NotChecked=0, Total=834482 [2021-11-23 02:16:53,549 INFO L933 BasicCegarLoop]: 8 mSDtfsCounter, 4 mSDsluCounter, 43 mSDsCounter, 0 mSdLazyCounter, 589 mSolverCounterSat, 2242 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4 SdHoareTripleChecker+Valid, 48 SdHoareTripleChecker+Invalid, 2831 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2242 IncrementalHoareTripleChecker+Valid, 589 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.5s IncrementalHoareTripleChecker+Time [2021-11-23 02:16:53,549 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [4 Valid, 48 Invalid, 2831 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2242 Valid, 589 Invalid, 0 Unknown, 0 Unchecked, 1.5s Time] [2021-11-23 02:16:53,550 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 477 states. [2021-11-23 02:16:53,592 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 477 to 477. [2021-11-23 02:16:53,593 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 477 states, 471 states have (on average 1.0084925690021231) internal successors, (475), 473 states have internal predecessors, (475), 3 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-23 02:16:53,599 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 477 states to 477 states and 480 transitions. [2021-11-23 02:16:53,599 INFO L78 Accepts]: Start accepts. Automaton has 477 states and 480 transitions. Word has length 242 [2021-11-23 02:16:53,600 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:16:53,600 INFO L470 AbstractCegarLoop]: Abstraction has 477 states and 480 transitions. [2021-11-23 02:16:53,602 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 684 states, 684 states have (on average 1.010233918128655) internal successors, (691), 683 states have internal predecessors, (691), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:16:53,602 INFO L276 IsEmpty]: Start isEmpty. Operand 477 states and 480 transitions. [2021-11-23 02:16:53,615 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 469 [2021-11-23 02:16:53,616 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:16:53,616 INFO L514 BasicCegarLoop]: trace histogram [446, 15, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:16:53,661 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_20fce25a-636c-4f8a-9d1c-fe541eb08a14/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2021-11-23 02:16:53,844 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_20fce25a-636c-4f8a-9d1c-fe541eb08a14/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:16:53,845 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:16:53,845 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:16:53,845 INFO L85 PathProgramCache]: Analyzing trace with hash -194039494, now seen corresponding path program 10 times [2021-11-23 02:16:53,845 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:16:53,846 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [121390945] [2021-11-23 02:16:53,846 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:16:53,846 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:16:55,518 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:18:28,929 INFO L134 CoverageAnalysis]: Checked inductivity of 99801 backedges. 0 proven. 99801 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:18:28,930 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:18:28,930 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [121390945] [2021-11-23 02:18:28,930 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [121390945] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:18:28,931 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2118509781] [2021-11-23 02:18:28,931 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-23 02:18:28,931 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:18:28,931 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_20fce25a-636c-4f8a-9d1c-fe541eb08a14/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:18:28,945 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_20fce25a-636c-4f8a-9d1c-fe541eb08a14/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:18:28,946 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_20fce25a-636c-4f8a-9d1c-fe541eb08a14/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2021-11-23 02:18:30,032 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:18:30,063 INFO L263 TraceCheckSpWp]: Trace formula consists of 1039 conjuncts, 448 conjunts are in the unsatisfiable core [2021-11-23 02:18:30,082 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:21:35,245 INFO L134 CoverageAnalysis]: Checked inductivity of 99801 backedges. 0 proven. 99681 refuted. 0 times theorem prover too weak. 120 trivial. 0 not checked. [2021-11-23 02:21:35,245 INFO L328 TraceCheckSpWp]: Computing backward predicates...