./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/ntdrivers/kbfiltr.i.cil-2.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_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/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_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/config/TaipanReach.xml -i ../../sv-benchmarks/c/ntdrivers/kbfiltr.i.cil-2.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/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_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/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 791fd4c1f54f973c646b3f11f7eb2f654eca269cacf7e504443ee0d13fbe9694 --- Real Ultimate output --- This is Ultimate 0.2.1-dev-aef121e [2021-11-23 03:22:42,470 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-23 03:22:42,473 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-23 03:22:42,512 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-23 03:22:42,512 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-23 03:22:42,514 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-23 03:22:42,516 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-23 03:22:42,518 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-23 03:22:42,520 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-23 03:22:42,521 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-23 03:22:42,523 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-23 03:22:42,524 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-23 03:22:42,525 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-23 03:22:42,526 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-23 03:22:42,528 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-23 03:22:42,530 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-23 03:22:42,531 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-23 03:22:42,533 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-23 03:22:42,535 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-23 03:22:42,538 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-23 03:22:42,540 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-23 03:22:42,541 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-23 03:22:42,543 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-23 03:22:42,544 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-23 03:22:42,548 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-23 03:22:42,548 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-23 03:22:42,549 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-23 03:22:42,550 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-23 03:22:42,551 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-23 03:22:42,552 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-23 03:22:42,552 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-23 03:22:42,553 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-23 03:22:42,555 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-23 03:22:42,556 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-23 03:22:42,557 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-23 03:22:42,558 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-23 03:22:42,559 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-23 03:22:42,559 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-23 03:22:42,560 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-23 03:22:42,561 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-23 03:22:42,562 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-23 03:22:42,563 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-23 03:22:42,593 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-23 03:22:42,593 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-23 03:22:42,593 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-23 03:22:42,593 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-23 03:22:42,594 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-23 03:22:42,594 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-23 03:22:42,595 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-23 03:22:42,595 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-23 03:22:42,595 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-23 03:22:42,595 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-23 03:22:42,595 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-23 03:22:42,595 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-23 03:22:42,596 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-23 03:22:42,596 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-23 03:22:42,596 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-23 03:22:42,596 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-23 03:22:42,596 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-23 03:22:42,597 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-23 03:22:42,597 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-23 03:22:42,598 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-23 03:22:42,598 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-23 03:22:42,598 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-23 03:22:42,598 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-23 03:22:42,598 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-23 03:22:42,598 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-23 03:22:42,599 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-23 03:22:42,599 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-23 03:22:42,599 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-23 03:22:42,599 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-23 03:22:42,599 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-23 03:22:42,600 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-23 03:22:42,600 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-23 03:22:42,600 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 03:22:42,600 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-23 03:22:42,600 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-23 03:22:42,600 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-23 03:22:42,601 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-23 03:22:42,601 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-23 03:22:42,601 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-23 03:22:42,601 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-23 03:22:42,601 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-23 03:22:42,602 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_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 791fd4c1f54f973c646b3f11f7eb2f654eca269cacf7e504443ee0d13fbe9694 [2021-11-23 03:22:42,898 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-23 03:22:42,925 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-23 03:22:42,929 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-23 03:22:42,930 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-23 03:22:42,932 INFO L275 PluginConnector]: CDTParser initialized [2021-11-23 03:22:42,933 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/../../sv-benchmarks/c/ntdrivers/kbfiltr.i.cil-2.c [2021-11-23 03:22:43,024 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/data/a3a6df9c8/e2ddab51b264409b84a613a3cc8f6673/FLAGca3a39c98 [2021-11-23 03:22:43,699 INFO L306 CDTParser]: Found 1 translation units. [2021-11-23 03:22:43,699 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/sv-benchmarks/c/ntdrivers/kbfiltr.i.cil-2.c [2021-11-23 03:22:43,744 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/data/a3a6df9c8/e2ddab51b264409b84a613a3cc8f6673/FLAGca3a39c98 [2021-11-23 03:22:43,841 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/data/a3a6df9c8/e2ddab51b264409b84a613a3cc8f6673 [2021-11-23 03:22:43,843 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-23 03:22:43,846 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-23 03:22:43,850 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-23 03:22:43,850 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-23 03:22:43,854 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-23 03:22:43,855 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 03:22:43" (1/1) ... [2021-11-23 03:22:43,857 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@5708ea62 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:22:43, skipping insertion in model container [2021-11-23 03:22:43,859 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 03:22:43" (1/1) ... [2021-11-23 03:22:43,867 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-23 03:22:43,959 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-23 03:22:44,511 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_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/sv-benchmarks/c/ntdrivers/kbfiltr.i.cil-2.c[62209,62222] [2021-11-23 03:22:44,668 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 03:22:44,679 INFO L203 MainTranslator]: Completed pre-run [2021-11-23 03:22:44,783 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_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/sv-benchmarks/c/ntdrivers/kbfiltr.i.cil-2.c[62209,62222] [2021-11-23 03:22:44,994 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 03:22:45,035 INFO L208 MainTranslator]: Completed translation [2021-11-23 03:22:45,036 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:22:45 WrapperNode [2021-11-23 03:22:45,036 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-23 03:22:45,037 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-23 03:22:45,037 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-23 03:22:45,037 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-23 03:22:45,045 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:22:45" (1/1) ... [2021-11-23 03:22:45,109 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:22:45" (1/1) ... [2021-11-23 03:22:45,195 INFO L137 Inliner]: procedures = 109, calls = 328, calls flagged for inlining = 23, calls inlined = 20, statements flattened = 1084 [2021-11-23 03:22:45,196 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-23 03:22:45,197 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-23 03:22:45,197 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-23 03:22:45,197 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-23 03:22:45,207 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:22:45" (1/1) ... [2021-11-23 03:22:45,208 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:22:45" (1/1) ... [2021-11-23 03:22:45,227 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:22:45" (1/1) ... [2021-11-23 03:22:45,228 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:22:45" (1/1) ... [2021-11-23 03:22:45,305 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:22:45" (1/1) ... [2021-11-23 03:22:45,313 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:22:45" (1/1) ... [2021-11-23 03:22:45,342 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:22:45" (1/1) ... [2021-11-23 03:22:45,354 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-23 03:22:45,355 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-23 03:22:45,355 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-23 03:22:45,355 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-23 03:22:45,371 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:22:45" (1/1) ... [2021-11-23 03:22:45,382 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 03:22:45,396 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:22:45,428 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-23 03:22:45,455 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-23 03:22:45,491 INFO L130 BoogieDeclarations]: Found specification of procedure KbFilter_Complete [2021-11-23 03:22:45,491 INFO L138 BoogieDeclarations]: Found implementation of procedure KbFilter_Complete [2021-11-23 03:22:45,492 INFO L130 BoogieDeclarations]: Found specification of procedure write~unchecked~int [2021-11-23 03:22:45,492 INFO L130 BoogieDeclarations]: Found specification of procedure read~unchecked~$Pointer$ [2021-11-23 03:22:45,492 INFO L130 BoogieDeclarations]: Found specification of procedure write~unchecked~$Pointer$ [2021-11-23 03:22:45,492 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-11-23 03:22:45,493 INFO L130 BoogieDeclarations]: Found specification of procedure errorFn [2021-11-23 03:22:45,493 INFO L138 BoogieDeclarations]: Found implementation of procedure errorFn [2021-11-23 03:22:45,493 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-11-23 03:22:45,493 INFO L130 BoogieDeclarations]: Found specification of procedure IofCompleteRequest [2021-11-23 03:22:45,493 INFO L138 BoogieDeclarations]: Found implementation of procedure IofCompleteRequest [2021-11-23 03:22:45,494 INFO L130 BoogieDeclarations]: Found specification of procedure IofCallDriver [2021-11-23 03:22:45,494 INFO L138 BoogieDeclarations]: Found implementation of procedure IofCallDriver [2021-11-23 03:22:45,494 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2021-11-23 03:22:45,494 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-23 03:22:45,494 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-11-23 03:22:45,494 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2021-11-23 03:22:45,495 INFO L130 BoogieDeclarations]: Found specification of procedure stubMoreProcessingRequired [2021-11-23 03:22:45,495 INFO L138 BoogieDeclarations]: Found implementation of procedure stubMoreProcessingRequired [2021-11-23 03:22:45,495 INFO L130 BoogieDeclarations]: Found specification of procedure KbFilter_CreateClose [2021-11-23 03:22:45,495 INFO L138 BoogieDeclarations]: Found implementation of procedure KbFilter_CreateClose [2021-11-23 03:22:45,495 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2021-11-23 03:22:45,496 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-11-23 03:22:45,496 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-23 03:22:45,496 INFO L130 BoogieDeclarations]: Found specification of procedure read~unchecked~int [2021-11-23 03:22:45,496 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-23 03:22:45,496 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-23 03:22:45,496 INFO L130 BoogieDeclarations]: Found specification of procedure KbFilter_DispatchPassThrough [2021-11-23 03:22:45,497 INFO L138 BoogieDeclarations]: Found implementation of procedure KbFilter_DispatchPassThrough [2021-11-23 03:22:45,886 INFO L236 CfgBuilder]: Building ICFG [2021-11-23 03:22:45,888 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-23 03:22:45,977 WARN L815 $ProcedureCfgBuilder]: Label in the middle of a codeblock. [2021-11-23 03:22:46,041 INFO L768 $ProcedureCfgBuilder]: dead code at ProgramPoint $Ultimate##12: assume !false; [2021-11-23 03:22:46,041 INFO L768 $ProcedureCfgBuilder]: dead code at ProgramPoint $Ultimate##11: assume false; [2021-11-23 03:22:46,140 WARN L815 $ProcedureCfgBuilder]: Label in the middle of a codeblock. [2021-11-23 03:22:46,142 WARN L815 $ProcedureCfgBuilder]: Label in the middle of a codeblock. [2021-11-23 03:22:46,144 WARN L815 $ProcedureCfgBuilder]: Label in the middle of a codeblock. [2021-11-23 03:22:46,149 WARN L815 $ProcedureCfgBuilder]: Label in the middle of a codeblock. [2021-11-23 03:22:46,152 WARN L815 $ProcedureCfgBuilder]: Label in the middle of a codeblock. [2021-11-23 03:22:46,156 WARN L815 $ProcedureCfgBuilder]: Label in the middle of a codeblock. [2021-11-23 03:22:46,158 WARN L815 $ProcedureCfgBuilder]: Label in the middle of a codeblock. [2021-11-23 03:22:48,478 INFO L768 $ProcedureCfgBuilder]: dead code at ProgramPoint $Ultimate##83: assume false; [2021-11-23 03:22:48,478 INFO L768 $ProcedureCfgBuilder]: dead code at ProgramPoint $Ultimate##84: assume !false; [2021-11-23 03:22:48,479 INFO L768 $ProcedureCfgBuilder]: dead code at ProgramPoint $Ultimate##36: assume !false; [2021-11-23 03:22:48,479 INFO L768 $ProcedureCfgBuilder]: dead code at ProgramPoint $Ultimate##35: assume false; [2021-11-23 03:22:48,479 INFO L768 $ProcedureCfgBuilder]: dead code at ProgramPoint $Ultimate##139: assume false; [2021-11-23 03:22:48,479 INFO L768 $ProcedureCfgBuilder]: dead code at ProgramPoint $Ultimate##140: assume !false; [2021-11-23 03:22:48,480 INFO L768 $ProcedureCfgBuilder]: dead code at ProgramPoint $Ultimate##20: assume !false; [2021-11-23 03:22:48,480 INFO L768 $ProcedureCfgBuilder]: dead code at ProgramPoint $Ultimate##19: assume false; [2021-11-23 03:22:48,480 INFO L768 $ProcedureCfgBuilder]: dead code at ProgramPoint $Ultimate##10: assume false; [2021-11-23 03:22:48,481 INFO L768 $ProcedureCfgBuilder]: dead code at ProgramPoint $Ultimate##157: assume !false; [2021-11-23 03:22:48,481 INFO L768 $ProcedureCfgBuilder]: dead code at ProgramPoint $Ultimate##11: assume !false; [2021-11-23 03:22:48,481 INFO L768 $ProcedureCfgBuilder]: dead code at ProgramPoint $Ultimate##156: assume false; [2021-11-23 03:22:48,481 INFO L768 $ProcedureCfgBuilder]: dead code at ProgramPoint $Ultimate##114: assume !false; [2021-11-23 03:22:48,482 INFO L768 $ProcedureCfgBuilder]: dead code at ProgramPoint $Ultimate##113: assume false; [2021-11-23 03:22:48,508 INFO L277 CfgBuilder]: Performing block encoding [2021-11-23 03:22:49,052 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-23 03:22:49,052 INFO L301 CfgBuilder]: Removed 0 assume(true) statements. [2021-11-23 03:22:49,055 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 03:22:49 BoogieIcfgContainer [2021-11-23 03:22:49,055 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-23 03:22:49,057 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-23 03:22:49,057 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-23 03:22:49,061 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-23 03:22:49,061 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.11 03:22:43" (1/3) ... [2021-11-23 03:22:49,062 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3cb6a8a1 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 03:22:49, skipping insertion in model container [2021-11-23 03:22:49,062 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:22:45" (2/3) ... [2021-11-23 03:22:49,063 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3cb6a8a1 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 03:22:49, skipping insertion in model container [2021-11-23 03:22:49,063 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 03:22:49" (3/3) ... [2021-11-23 03:22:49,064 INFO L111 eAbstractionObserver]: Analyzing ICFG kbfiltr.i.cil-2.c [2021-11-23 03:22:49,070 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-23 03:22:49,070 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-23 03:22:49,121 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-23 03:22:49,128 INFO L339 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mLoopAccelerationTechnique=FAST_UPR [2021-11-23 03:22:49,128 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-23 03:22:49,150 INFO L276 IsEmpty]: Start isEmpty. Operand has 146 states, 108 states have (on average 1.6203703703703705) internal successors, (175), 126 states have internal predecessors, (175), 29 states have call successors, (29), 7 states have call predecessors, (29), 7 states have return successors, (29), 27 states have call predecessors, (29), 29 states have call successors, (29) [2021-11-23 03:22:49,155 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-11-23 03:22:49,156 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:22:49,156 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:22:49,157 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting errorFnErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorFnErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:22:49,162 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:22:49,163 INFO L85 PathProgramCache]: Analyzing trace with hash 1730859452, now seen corresponding path program 1 times [2021-11-23 03:22:49,173 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:22:49,174 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1617148051] [2021-11-23 03:22:49,174 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:22:49,175 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:22:49,404 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:22:49,632 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:22:49,632 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:22:49,633 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1617148051] [2021-11-23 03:22:49,634 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1617148051] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:22:49,634 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 03:22:49,634 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-23 03:22:49,636 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1377535278] [2021-11-23 03:22:49,637 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:22:49,641 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 03:22:49,642 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:22:49,667 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 03:22:49,668 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 03:22:49,671 INFO L87 Difference]: Start difference. First operand has 146 states, 108 states have (on average 1.6203703703703705) internal successors, (175), 126 states have internal predecessors, (175), 29 states have call successors, (29), 7 states have call predecessors, (29), 7 states have return successors, (29), 27 states have call predecessors, (29), 29 states have call successors, (29) Second operand has 3 states, 3 states have (on average 3.3333333333333335) internal successors, (10), 2 states have internal predecessors, (10), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:22:51,711 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.03s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 03:22:53,406 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:22:53,407 INFO L93 Difference]: Finished difference Result 249 states and 394 transitions. [2021-11-23 03:22:53,408 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 03:22:53,409 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 3.3333333333333335) internal successors, (10), 2 states have internal predecessors, (10), 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 11 [2021-11-23 03:22:53,410 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:22:53,421 INFO L225 Difference]: With dead ends: 249 [2021-11-23 03:22:53,421 INFO L226 Difference]: Without dead ends: 142 [2021-11-23 03:22:53,425 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 03:22:53,429 INFO L933 BasicCegarLoop]: 181 mSDtfsCounter, 97 mSDsluCounter, 92 mSDsCounter, 0 mSdLazyCounter, 59 mSolverCounterSat, 3 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 108 SdHoareTripleChecker+Valid, 262 SdHoareTripleChecker+Invalid, 63 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 59 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.7s IncrementalHoareTripleChecker+Time [2021-11-23 03:22:53,430 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [108 Valid, 262 Invalid, 63 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 59 Invalid, 1 Unknown, 0 Unchecked, 3.7s Time] [2021-11-23 03:22:53,447 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 142 states. [2021-11-23 03:22:53,477 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 142 to 142. [2021-11-23 03:22:53,479 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 142 states, 106 states have (on average 1.5) internal successors, (159), 122 states have internal predecessors, (159), 29 states have call successors, (29), 7 states have call predecessors, (29), 6 states have return successors, (15), 15 states have call predecessors, (15), 15 states have call successors, (15) [2021-11-23 03:22:53,483 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 142 states to 142 states and 203 transitions. [2021-11-23 03:22:53,484 INFO L78 Accepts]: Start accepts. Automaton has 142 states and 203 transitions. Word has length 11 [2021-11-23 03:22:53,485 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:22:53,485 INFO L470 AbstractCegarLoop]: Abstraction has 142 states and 203 transitions. [2021-11-23 03:22:53,485 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 3.3333333333333335) internal successors, (10), 2 states have internal predecessors, (10), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:22:53,486 INFO L276 IsEmpty]: Start isEmpty. Operand 142 states and 203 transitions. [2021-11-23 03:22:53,487 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2021-11-23 03:22:53,487 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:22:53,487 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:22:53,488 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-23 03:22:53,488 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting errorFnErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorFnErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:22:53,489 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:22:53,489 INFO L85 PathProgramCache]: Analyzing trace with hash 565032555, now seen corresponding path program 1 times [2021-11-23 03:22:53,489 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:22:53,489 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1966795680] [2021-11-23 03:22:53,490 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:22:53,490 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:22:53,560 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:22:53,678 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:22:53,679 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:22:53,679 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1966795680] [2021-11-23 03:22:53,679 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1966795680] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:22:53,680 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 03:22:53,680 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 03:22:53,680 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [928053025] [2021-11-23 03:22:53,681 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:22:53,682 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 03:22:53,683 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:22:53,684 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 03:22:53,688 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 03:22:53,688 INFO L87 Difference]: Start difference. First operand 142 states and 203 transitions. Second operand has 3 states, 3 states have (on average 4.0) internal successors, (12), 3 states have internal predecessors, (12), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:22:55,702 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 03:22:56,864 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:22:56,864 INFO L93 Difference]: Finished difference Result 216 states and 300 transitions. [2021-11-23 03:22:56,865 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 03:22:56,865 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 4.0) internal successors, (12), 3 states have internal predecessors, (12), 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 13 [2021-11-23 03:22:56,865 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:22:56,869 INFO L225 Difference]: With dead ends: 216 [2021-11-23 03:22:56,869 INFO L226 Difference]: Without dead ends: 169 [2021-11-23 03:22:56,870 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 03:22:56,872 INFO L933 BasicCegarLoop]: 153 mSDtfsCounter, 98 mSDsluCounter, 78 mSDsCounter, 0 mSdLazyCounter, 105 mSolverCounterSat, 12 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 98 SdHoareTripleChecker+Valid, 220 SdHoareTripleChecker+Invalid, 118 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 105 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.1s IncrementalHoareTripleChecker+Time [2021-11-23 03:22:56,872 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [98 Valid, 220 Invalid, 118 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 105 Invalid, 1 Unknown, 0 Unchecked, 3.1s Time] [2021-11-23 03:22:56,874 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 169 states. [2021-11-23 03:22:56,895 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 169 to 154. [2021-11-23 03:22:56,896 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 154 states, 120 states have (on average 1.4083333333333334) internal successors, (169), 129 states have internal predecessors, (169), 26 states have call successors, (26), 11 states have call predecessors, (26), 7 states have return successors, (18), 16 states have call predecessors, (18), 18 states have call successors, (18) [2021-11-23 03:22:56,900 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 154 states to 154 states and 213 transitions. [2021-11-23 03:22:56,900 INFO L78 Accepts]: Start accepts. Automaton has 154 states and 213 transitions. Word has length 13 [2021-11-23 03:22:56,900 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:22:56,901 INFO L470 AbstractCegarLoop]: Abstraction has 154 states and 213 transitions. [2021-11-23 03:22:56,901 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 4.0) internal successors, (12), 3 states have internal predecessors, (12), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:22:56,901 INFO L276 IsEmpty]: Start isEmpty. Operand 154 states and 213 transitions. [2021-11-23 03:22:56,903 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2021-11-23 03:22:56,903 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:22:56,903 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:22:56,904 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-11-23 03:22:56,904 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting errorFnErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorFnErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:22:56,905 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:22:56,905 INFO L85 PathProgramCache]: Analyzing trace with hash 589104444, now seen corresponding path program 1 times [2021-11-23 03:22:56,905 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:22:56,905 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1357957735] [2021-11-23 03:22:56,906 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:22:56,906 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:22:56,960 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:22:57,035 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:22:57,035 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:22:57,036 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1357957735] [2021-11-23 03:22:57,036 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1357957735] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:22:57,036 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 03:22:57,036 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 03:22:57,037 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1202238235] [2021-11-23 03:22:57,037 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:22:57,038 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 03:22:57,038 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:22:57,038 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 03:22:57,039 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 03:22:57,039 INFO L87 Difference]: Start difference. First operand 154 states and 213 transitions. Second operand has 3 states, 3 states have (on average 5.0) internal successors, (15), 3 states have internal predecessors, (15), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:22:59,053 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 03:23:00,440 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:23:00,440 INFO L93 Difference]: Finished difference Result 247 states and 334 transitions. [2021-11-23 03:23:00,441 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 03:23:00,441 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 5.0) internal successors, (15), 3 states have internal predecessors, (15), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 16 [2021-11-23 03:23:00,441 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:23:00,444 INFO L225 Difference]: With dead ends: 247 [2021-11-23 03:23:00,444 INFO L226 Difference]: Without dead ends: 189 [2021-11-23 03:23:00,445 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 03:23:00,446 INFO L933 BasicCegarLoop]: 162 mSDtfsCounter, 153 mSDsluCounter, 67 mSDsCounter, 0 mSdLazyCounter, 45 mSolverCounterSat, 4 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 153 SdHoareTripleChecker+Valid, 221 SdHoareTripleChecker+Invalid, 50 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 45 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.4s IncrementalHoareTripleChecker+Time [2021-11-23 03:23:00,446 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [153 Valid, 221 Invalid, 50 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 45 Invalid, 1 Unknown, 0 Unchecked, 3.4s Time] [2021-11-23 03:23:00,448 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 189 states. [2021-11-23 03:23:00,463 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 189 to 167. [2021-11-23 03:23:00,464 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 167 states, 136 states have (on average 1.3823529411764706) internal successors, (188), 142 states have internal predecessors, (188), 22 states have call successors, (22), 11 states have call predecessors, (22), 8 states have return successors, (17), 14 states have call predecessors, (17), 16 states have call successors, (17) [2021-11-23 03:23:00,466 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 167 states to 167 states and 227 transitions. [2021-11-23 03:23:00,467 INFO L78 Accepts]: Start accepts. Automaton has 167 states and 227 transitions. Word has length 16 [2021-11-23 03:23:00,467 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:23:00,467 INFO L470 AbstractCegarLoop]: Abstraction has 167 states and 227 transitions. [2021-11-23 03:23:00,468 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 5.0) internal successors, (15), 3 states have internal predecessors, (15), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:23:00,468 INFO L276 IsEmpty]: Start isEmpty. Operand 167 states and 227 transitions. [2021-11-23 03:23:00,469 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2021-11-23 03:23:00,469 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:23:00,470 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:23:00,470 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-11-23 03:23:00,470 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting errorFnErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorFnErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:23:00,471 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:23:00,471 INFO L85 PathProgramCache]: Analyzing trace with hash -1195338027, now seen corresponding path program 1 times [2021-11-23 03:23:00,471 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:23:00,471 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [200698608] [2021-11-23 03:23:00,472 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:23:00,472 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:23:00,542 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:23:00,713 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:23:00,714 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:23:00,714 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [200698608] [2021-11-23 03:23:00,714 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [200698608] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:23:00,715 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 03:23:00,716 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 03:23:00,716 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [836931803] [2021-11-23 03:23:00,716 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:23:00,717 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 03:23:00,717 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:23:00,718 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 03:23:00,718 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 03:23:00,718 INFO L87 Difference]: Start difference. First operand 167 states and 227 transitions. Second operand has 4 states, 4 states have (on average 4.25) internal successors, (17), 3 states have internal predecessors, (17), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:23:02,735 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.02s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 03:23:04,220 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:23:04,220 INFO L93 Difference]: Finished difference Result 190 states and 253 transitions. [2021-11-23 03:23:04,221 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 03:23:04,221 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 4.25) internal successors, (17), 3 states have internal predecessors, (17), 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 18 [2021-11-23 03:23:04,221 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:23:04,223 INFO L225 Difference]: With dead ends: 190 [2021-11-23 03:23:04,223 INFO L226 Difference]: Without dead ends: 182 [2021-11-23 03:23:04,224 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-23 03:23:04,225 INFO L933 BasicCegarLoop]: 118 mSDtfsCounter, 259 mSDsluCounter, 44 mSDsCounter, 0 mSdLazyCounter, 135 mSolverCounterSat, 34 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 259 SdHoareTripleChecker+Valid, 152 SdHoareTripleChecker+Invalid, 170 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 34 IncrementalHoareTripleChecker+Valid, 135 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.5s IncrementalHoareTripleChecker+Time [2021-11-23 03:23:04,225 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [259 Valid, 152 Invalid, 170 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [34 Valid, 135 Invalid, 1 Unknown, 0 Unchecked, 3.5s Time] [2021-11-23 03:23:04,227 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 182 states. [2021-11-23 03:23:04,244 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 182 to 172. [2021-11-23 03:23:04,245 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 172 states, 141 states have (on average 1.375886524822695) internal successors, (194), 147 states have internal predecessors, (194), 22 states have call successors, (22), 11 states have call predecessors, (22), 8 states have return successors, (17), 14 states have call predecessors, (17), 16 states have call successors, (17) [2021-11-23 03:23:04,247 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 172 states to 172 states and 233 transitions. [2021-11-23 03:23:04,247 INFO L78 Accepts]: Start accepts. Automaton has 172 states and 233 transitions. Word has length 18 [2021-11-23 03:23:04,248 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:23:04,248 INFO L470 AbstractCegarLoop]: Abstraction has 172 states and 233 transitions. [2021-11-23 03:23:04,248 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 4.25) internal successors, (17), 3 states have internal predecessors, (17), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:23:04,249 INFO L276 IsEmpty]: Start isEmpty. Operand 172 states and 233 transitions. [2021-11-23 03:23:04,250 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2021-11-23 03:23:04,251 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:23:04,251 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:23:04,251 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-11-23 03:23:04,251 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting errorFnErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorFnErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:23:04,252 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:23:04,252 INFO L85 PathProgramCache]: Analyzing trace with hash 1191803813, now seen corresponding path program 1 times [2021-11-23 03:23:04,252 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:23:04,253 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1592220731] [2021-11-23 03:23:04,253 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:23:04,253 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:23:04,292 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:23:04,401 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:23:04,401 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:23:04,402 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1592220731] [2021-11-23 03:23:04,402 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1592220731] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:23:04,402 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 03:23:04,402 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 03:23:04,402 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [945563575] [2021-11-23 03:23:04,403 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:23:04,403 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 03:23:04,404 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:23:04,405 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 03:23:04,405 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 03:23:04,405 INFO L87 Difference]: Start difference. First operand 172 states and 233 transitions. Second operand has 4 states, 4 states have (on average 4.5) internal successors, (18), 3 states have internal predecessors, (18), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:23:06,422 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.02s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 03:23:08,024 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.13s for a HTC check with result INVALID. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 03:23:08,282 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:23:08,282 INFO L93 Difference]: Finished difference Result 190 states and 252 transitions. [2021-11-23 03:23:08,283 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 03:23:08,283 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 4.5) internal successors, (18), 3 states have internal predecessors, (18), 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 19 [2021-11-23 03:23:08,284 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:23:08,285 INFO L225 Difference]: With dead ends: 190 [2021-11-23 03:23:08,285 INFO L226 Difference]: Without dead ends: 182 [2021-11-23 03:23:08,286 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-23 03:23:08,287 INFO L933 BasicCegarLoop]: 122 mSDtfsCounter, 255 mSDsluCounter, 44 mSDsCounter, 0 mSdLazyCounter, 132 mSolverCounterSat, 34 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 255 SdHoareTripleChecker+Valid, 156 SdHoareTripleChecker+Invalid, 167 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 34 IncrementalHoareTripleChecker+Valid, 132 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.8s IncrementalHoareTripleChecker+Time [2021-11-23 03:23:08,287 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [255 Valid, 156 Invalid, 167 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [34 Valid, 132 Invalid, 1 Unknown, 0 Unchecked, 3.8s Time] [2021-11-23 03:23:08,288 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 182 states. [2021-11-23 03:23:08,302 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 182 to 173. [2021-11-23 03:23:08,303 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 173 states, 142 states have (on average 1.3732394366197183) internal successors, (195), 148 states have internal predecessors, (195), 22 states have call successors, (22), 11 states have call predecessors, (22), 8 states have return successors, (17), 14 states have call predecessors, (17), 16 states have call successors, (17) [2021-11-23 03:23:08,305 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 173 states to 173 states and 234 transitions. [2021-11-23 03:23:08,305 INFO L78 Accepts]: Start accepts. Automaton has 173 states and 234 transitions. Word has length 19 [2021-11-23 03:23:08,305 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:23:08,305 INFO L470 AbstractCegarLoop]: Abstraction has 173 states and 234 transitions. [2021-11-23 03:23:08,306 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 4.5) internal successors, (18), 3 states have internal predecessors, (18), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:23:08,306 INFO L276 IsEmpty]: Start isEmpty. Operand 173 states and 234 transitions. [2021-11-23 03:23:08,307 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2021-11-23 03:23:08,308 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:23:08,308 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:23:08,308 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-11-23 03:23:08,308 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting errorFnErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorFnErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:23:08,309 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:23:08,309 INFO L85 PathProgramCache]: Analyzing trace with hash -385556894, now seen corresponding path program 1 times [2021-11-23 03:23:08,309 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:23:08,309 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1409498025] [2021-11-23 03:23:08,310 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:23:08,310 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:23:08,353 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:23:08,423 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:23:08,424 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:23:08,424 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1409498025] [2021-11-23 03:23:08,424 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1409498025] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:23:08,425 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 03:23:08,425 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 03:23:08,425 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1907718980] [2021-11-23 03:23:08,425 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:23:08,426 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 03:23:08,426 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:23:08,427 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 03:23:08,427 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 03:23:08,427 INFO L87 Difference]: Start difference. First operand 173 states and 234 transitions. Second operand has 3 states, 3 states have (on average 6.0) internal successors, (18), 3 states have internal predecessors, (18), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:23:10,449 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.02s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 03:23:12,515 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 03:23:14,176 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:23:14,177 INFO L93 Difference]: Finished difference Result 176 states and 236 transitions. [2021-11-23 03:23:14,185 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 03:23:14,186 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 6.0) internal successors, (18), 3 states have internal predecessors, (18), 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 19 [2021-11-23 03:23:14,186 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:23:14,188 INFO L225 Difference]: With dead ends: 176 [2021-11-23 03:23:14,188 INFO L226 Difference]: Without dead ends: 172 [2021-11-23 03:23:14,189 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 03:23:14,190 INFO L933 BasicCegarLoop]: 138 mSDtfsCounter, 13 mSDsluCounter, 123 mSDsCounter, 0 mSdLazyCounter, 95 mSolverCounterSat, 5 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 5.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 13 SdHoareTripleChecker+Valid, 237 SdHoareTripleChecker+Invalid, 102 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 95 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 5.7s IncrementalHoareTripleChecker+Time [2021-11-23 03:23:14,191 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [13 Valid, 237 Invalid, 102 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 95 Invalid, 2 Unknown, 0 Unchecked, 5.7s Time] [2021-11-23 03:23:14,192 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 172 states. [2021-11-23 03:23:14,210 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 172 to 172. [2021-11-23 03:23:14,211 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 172 states, 142 states have (on average 1.3591549295774648) internal successors, (193), 147 states have internal predecessors, (193), 21 states have call successors, (21), 11 states have call predecessors, (21), 8 states have return successors, (17), 14 states have call predecessors, (17), 16 states have call successors, (17) [2021-11-23 03:23:14,213 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 172 states to 172 states and 231 transitions. [2021-11-23 03:23:14,214 INFO L78 Accepts]: Start accepts. Automaton has 172 states and 231 transitions. Word has length 19 [2021-11-23 03:23:14,214 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:23:14,214 INFO L470 AbstractCegarLoop]: Abstraction has 172 states and 231 transitions. [2021-11-23 03:23:14,215 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 6.0) internal successors, (18), 3 states have internal predecessors, (18), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:23:14,215 INFO L276 IsEmpty]: Start isEmpty. Operand 172 states and 231 transitions. [2021-11-23 03:23:14,216 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-11-23 03:23:14,217 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:23:14,217 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:23:14,217 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2021-11-23 03:23:14,217 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting errorFnErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorFnErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:23:14,218 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:23:14,218 INFO L85 PathProgramCache]: Analyzing trace with hash -1947206132, now seen corresponding path program 1 times [2021-11-23 03:23:14,219 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:23:14,219 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [639743715] [2021-11-23 03:23:14,219 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:23:14,219 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:23:14,260 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:23:14,327 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:23:14,327 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:23:14,327 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [639743715] [2021-11-23 03:23:14,328 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [639743715] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:23:14,328 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 03:23:14,328 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 03:23:14,328 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1562879642] [2021-11-23 03:23:14,328 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:23:14,329 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 03:23:14,329 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:23:14,330 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 03:23:14,330 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 03:23:14,330 INFO L87 Difference]: Start difference. First operand 172 states and 231 transitions. Second operand has 4 states, 4 states have (on average 4.75) internal successors, (19), 3 states have internal predecessors, (19), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:23:16,342 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 03:23:18,359 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:23:18,359 INFO L93 Difference]: Finished difference Result 181 states and 240 transitions. [2021-11-23 03:23:18,360 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 03:23:18,360 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 4.75) internal successors, (19), 3 states have internal predecessors, (19), 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 20 [2021-11-23 03:23:18,360 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:23:18,362 INFO L225 Difference]: With dead ends: 181 [2021-11-23 03:23:18,362 INFO L226 Difference]: Without dead ends: 164 [2021-11-23 03:23:18,363 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-23 03:23:18,364 INFO L933 BasicCegarLoop]: 120 mSDtfsCounter, 239 mSDsluCounter, 44 mSDsCounter, 0 mSdLazyCounter, 129 mSolverCounterSat, 30 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 239 SdHoareTripleChecker+Valid, 154 SdHoareTripleChecker+Invalid, 160 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 30 IncrementalHoareTripleChecker+Valid, 129 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.0s IncrementalHoareTripleChecker+Time [2021-11-23 03:23:18,364 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [239 Valid, 154 Invalid, 160 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [30 Valid, 129 Invalid, 1 Unknown, 0 Unchecked, 4.0s Time] [2021-11-23 03:23:18,365 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 164 states. [2021-11-23 03:23:18,379 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 164 to 164. [2021-11-23 03:23:18,380 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 164 states, 134 states have (on average 1.3656716417910448) internal successors, (183), 139 states have internal predecessors, (183), 21 states have call successors, (21), 11 states have call predecessors, (21), 8 states have return successors, (17), 14 states have call predecessors, (17), 16 states have call successors, (17) [2021-11-23 03:23:18,382 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 164 states to 164 states and 221 transitions. [2021-11-23 03:23:18,382 INFO L78 Accepts]: Start accepts. Automaton has 164 states and 221 transitions. Word has length 20 [2021-11-23 03:23:18,383 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:23:18,383 INFO L470 AbstractCegarLoop]: Abstraction has 164 states and 221 transitions. [2021-11-23 03:23:18,383 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 4.75) internal successors, (19), 3 states have internal predecessors, (19), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:23:18,384 INFO L276 IsEmpty]: Start isEmpty. Operand 164 states and 221 transitions. [2021-11-23 03:23:18,385 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-11-23 03:23:18,385 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:23:18,386 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:23:18,386 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2021-11-23 03:23:18,386 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting errorFnErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorFnErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:23:18,387 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:23:18,387 INFO L85 PathProgramCache]: Analyzing trace with hash 1419775403, now seen corresponding path program 1 times [2021-11-23 03:23:18,387 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:23:18,388 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1417090768] [2021-11-23 03:23:18,388 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:23:18,388 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:23:18,431 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:23:18,508 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:23:18,509 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:23:18,509 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1417090768] [2021-11-23 03:23:18,509 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1417090768] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:23:18,510 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 03:23:18,510 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 03:23:18,510 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2065158947] [2021-11-23 03:23:18,510 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:23:18,511 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 03:23:18,511 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:23:18,512 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 03:23:18,512 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 03:23:18,512 INFO L87 Difference]: Start difference. First operand 164 states and 221 transitions. Second operand has 4 states, 4 states have (on average 6.25) internal successors, (25), 3 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 03:23:20,527 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 03:23:21,847 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.28s for a HTC check with result INVALID. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 03:23:24,100 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:23:24,100 INFO L93 Difference]: Finished difference Result 212 states and 281 transitions. [2021-11-23 03:23:24,101 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 03:23:24,101 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 6.25) internal successors, (25), 3 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 26 [2021-11-23 03:23:24,101 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:23:24,103 INFO L225 Difference]: With dead ends: 212 [2021-11-23 03:23:24,104 INFO L226 Difference]: Without dead ends: 179 [2021-11-23 03:23:24,104 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-23 03:23:24,105 INFO L933 BasicCegarLoop]: 131 mSDtfsCounter, 187 mSDsluCounter, 100 mSDsCounter, 0 mSdLazyCounter, 134 mSolverCounterSat, 26 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 5.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 187 SdHoareTripleChecker+Valid, 207 SdHoareTripleChecker+Invalid, 161 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 26 IncrementalHoareTripleChecker+Valid, 134 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 5.5s IncrementalHoareTripleChecker+Time [2021-11-23 03:23:24,106 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [187 Valid, 207 Invalid, 161 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [26 Valid, 134 Invalid, 1 Unknown, 0 Unchecked, 5.5s Time] [2021-11-23 03:23:24,107 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 179 states. [2021-11-23 03:23:24,122 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 179 to 164. [2021-11-23 03:23:24,123 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 164 states, 134 states have (on average 1.3507462686567164) internal successors, (181), 139 states have internal predecessors, (181), 21 states have call successors, (21), 11 states have call predecessors, (21), 8 states have return successors, (17), 14 states have call predecessors, (17), 16 states have call successors, (17) [2021-11-23 03:23:24,125 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 164 states to 164 states and 219 transitions. [2021-11-23 03:23:24,125 INFO L78 Accepts]: Start accepts. Automaton has 164 states and 219 transitions. Word has length 26 [2021-11-23 03:23:24,126 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:23:24,126 INFO L470 AbstractCegarLoop]: Abstraction has 164 states and 219 transitions. [2021-11-23 03:23:24,126 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 6.25) internal successors, (25), 3 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 03:23:24,127 INFO L276 IsEmpty]: Start isEmpty. Operand 164 states and 219 transitions. [2021-11-23 03:23:24,128 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2021-11-23 03:23:24,128 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:23:24,128 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:23:24,129 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2021-11-23 03:23:24,129 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting errorFnErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorFnErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:23:24,129 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:23:24,130 INFO L85 PathProgramCache]: Analyzing trace with hash -714256134, now seen corresponding path program 1 times [2021-11-23 03:23:24,130 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:23:24,130 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1523492572] [2021-11-23 03:23:24,130 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:23:24,131 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:23:24,171 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:23:24,296 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:23:24,297 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:23:24,297 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1523492572] [2021-11-23 03:23:24,297 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1523492572] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:23:24,297 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 03:23:24,298 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 03:23:24,298 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2045457761] [2021-11-23 03:23:24,298 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:23:24,298 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 03:23:24,299 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:23:24,299 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 03:23:24,299 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 03:23:24,300 INFO L87 Difference]: Start difference. First operand 164 states and 219 transitions. Second operand has 4 states, 4 states have (on average 6.5) internal successors, (26), 3 states have internal predecessors, (26), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:23:26,322 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.02s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 03:23:28,943 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.39s for a HTC check with result INVALID. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 03:23:29,618 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:23:29,618 INFO L93 Difference]: Finished difference Result 197 states and 261 transitions. [2021-11-23 03:23:29,619 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 03:23:29,619 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 6.5) internal successors, (26), 3 states have internal predecessors, (26), 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 27 [2021-11-23 03:23:29,619 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:23:29,621 INFO L225 Difference]: With dead ends: 197 [2021-11-23 03:23:29,622 INFO L226 Difference]: Without dead ends: 164 [2021-11-23 03:23:29,622 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-23 03:23:29,623 INFO L933 BasicCegarLoop]: 128 mSDtfsCounter, 174 mSDsluCounter, 100 mSDsCounter, 0 mSdLazyCounter, 124 mSolverCounterSat, 15 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 5.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 174 SdHoareTripleChecker+Valid, 204 SdHoareTripleChecker+Invalid, 140 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 15 IncrementalHoareTripleChecker+Valid, 124 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 5.3s IncrementalHoareTripleChecker+Time [2021-11-23 03:23:29,624 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [174 Valid, 204 Invalid, 140 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [15 Valid, 124 Invalid, 1 Unknown, 0 Unchecked, 5.3s Time] [2021-11-23 03:23:29,625 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 164 states. [2021-11-23 03:23:29,643 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 164 to 164. [2021-11-23 03:23:29,644 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 164 states, 134 states have (on average 1.335820895522388) internal successors, (179), 139 states have internal predecessors, (179), 21 states have call successors, (21), 11 states have call predecessors, (21), 8 states have return successors, (17), 14 states have call predecessors, (17), 16 states have call successors, (17) [2021-11-23 03:23:29,645 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 164 states to 164 states and 217 transitions. [2021-11-23 03:23:29,646 INFO L78 Accepts]: Start accepts. Automaton has 164 states and 217 transitions. Word has length 27 [2021-11-23 03:23:29,646 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:23:29,647 INFO L470 AbstractCegarLoop]: Abstraction has 164 states and 217 transitions. [2021-11-23 03:23:29,647 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 6.5) internal successors, (26), 3 states have internal predecessors, (26), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:23:29,647 INFO L276 IsEmpty]: Start isEmpty. Operand 164 states and 217 transitions. [2021-11-23 03:23:29,649 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-11-23 03:23:29,649 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:23:29,649 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:23:29,649 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2021-11-23 03:23:29,650 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting errorFnErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorFnErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:23:29,650 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:23:29,650 INFO L85 PathProgramCache]: Analyzing trace with hash 1357097798, now seen corresponding path program 1 times [2021-11-23 03:23:29,651 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:23:29,651 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [536545211] [2021-11-23 03:23:29,651 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:23:29,651 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:23:29,704 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:23:29,776 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:23:29,776 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:23:29,776 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [536545211] [2021-11-23 03:23:29,776 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [536545211] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:23:29,777 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 03:23:29,777 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 03:23:29,777 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [590357270] [2021-11-23 03:23:29,777 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:23:29,778 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 03:23:29,778 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:23:29,779 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 03:23:29,779 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 03:23:29,779 INFO L87 Difference]: Start difference. First operand 164 states and 217 transitions. Second operand has 3 states, 3 states have (on average 9.0) internal successors, (27), 3 states have internal predecessors, (27), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:23:31,791 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 03:23:33,040 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:23:33,040 INFO L93 Difference]: Finished difference Result 176 states and 232 transitions. [2021-11-23 03:23:33,040 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 03:23:33,041 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 9.0) internal successors, (27), 3 states have internal predecessors, (27), 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 28 [2021-11-23 03:23:33,041 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:23:33,044 INFO L225 Difference]: With dead ends: 176 [2021-11-23 03:23:33,044 INFO L226 Difference]: Without dead ends: 160 [2021-11-23 03:23:33,044 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 03:23:33,045 INFO L933 BasicCegarLoop]: 135 mSDtfsCounter, 159 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 31 mSolverCounterSat, 4 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 159 SdHoareTripleChecker+Valid, 135 SdHoareTripleChecker+Invalid, 36 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 31 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.2s IncrementalHoareTripleChecker+Time [2021-11-23 03:23:33,045 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [159 Valid, 135 Invalid, 36 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 31 Invalid, 1 Unknown, 0 Unchecked, 3.2s Time] [2021-11-23 03:23:33,046 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 160 states. [2021-11-23 03:23:33,057 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 160 to 160. [2021-11-23 03:23:33,058 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 160 states, 131 states have (on average 1.3206106870229009) internal successors, (173), 135 states have internal predecessors, (173), 20 states have call successors, (20), 11 states have call predecessors, (20), 8 states have return successors, (17), 14 states have call predecessors, (17), 16 states have call successors, (17) [2021-11-23 03:23:33,060 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 160 states to 160 states and 210 transitions. [2021-11-23 03:23:33,061 INFO L78 Accepts]: Start accepts. Automaton has 160 states and 210 transitions. Word has length 28 [2021-11-23 03:23:33,061 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:23:33,062 INFO L470 AbstractCegarLoop]: Abstraction has 160 states and 210 transitions. [2021-11-23 03:23:33,062 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 9.0) internal successors, (27), 3 states have internal predecessors, (27), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:23:33,062 INFO L276 IsEmpty]: Start isEmpty. Operand 160 states and 210 transitions. [2021-11-23 03:23:33,066 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2021-11-23 03:23:33,066 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:23:33,067 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:23:33,067 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2021-11-23 03:23:33,067 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting errorFnErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorFnErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:23:33,068 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:23:33,068 INFO L85 PathProgramCache]: Analyzing trace with hash -1985636482, now seen corresponding path program 1 times [2021-11-23 03:23:33,068 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:23:33,068 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [415842998] [2021-11-23 03:23:33,069 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:23:33,069 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:23:33,140 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:23:33,243 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:23:33,244 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:23:33,244 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [415842998] [2021-11-23 03:23:33,244 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [415842998] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:23:33,244 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 03:23:33,244 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 03:23:33,244 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1566900486] [2021-11-23 03:23:33,244 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:23:33,245 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 03:23:33,245 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:23:33,245 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 03:23:33,245 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 03:23:33,246 INFO L87 Difference]: Start difference. First operand 160 states and 210 transitions. Second operand has 4 states, 4 states have (on average 6.5) internal successors, (26), 4 states have internal predecessors, (26), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-23 03:23:35,260 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 03:23:36,767 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.10s for a HTC check with result INVALID. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 03:23:38,902 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:23:38,902 INFO L93 Difference]: Finished difference Result 198 states and 248 transitions. [2021-11-23 03:23:38,903 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 03:23:38,903 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 6.5) internal successors, (26), 4 states have internal predecessors, (26), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 30 [2021-11-23 03:23:38,903 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:23:38,905 INFO L225 Difference]: With dead ends: 198 [2021-11-23 03:23:38,905 INFO L226 Difference]: Without dead ends: 159 [2021-11-23 03:23:38,906 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 03:23:38,906 INFO L933 BasicCegarLoop]: 155 mSDtfsCounter, 184 mSDsluCounter, 154 mSDsCounter, 0 mSdLazyCounter, 103 mSolverCounterSat, 3 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 5.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 184 SdHoareTripleChecker+Valid, 279 SdHoareTripleChecker+Invalid, 107 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 103 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 5.6s IncrementalHoareTripleChecker+Time [2021-11-23 03:23:38,907 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [184 Valid, 279 Invalid, 107 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 103 Invalid, 1 Unknown, 0 Unchecked, 5.6s Time] [2021-11-23 03:23:38,907 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 159 states. [2021-11-23 03:23:38,920 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 159 to 144. [2021-11-23 03:23:38,921 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 144 states, 117 states have (on average 1.2991452991452992) internal successors, (152), 121 states have internal predecessors, (152), 18 states have call successors, (18), 10 states have call predecessors, (18), 8 states have return successors, (14), 13 states have call predecessors, (14), 14 states have call successors, (14) [2021-11-23 03:23:38,922 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 144 states to 144 states and 184 transitions. [2021-11-23 03:23:38,922 INFO L78 Accepts]: Start accepts. Automaton has 144 states and 184 transitions. Word has length 30 [2021-11-23 03:23:38,923 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:23:38,923 INFO L470 AbstractCegarLoop]: Abstraction has 144 states and 184 transitions. [2021-11-23 03:23:38,923 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 6.5) internal successors, (26), 4 states have internal predecessors, (26), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-23 03:23:38,923 INFO L276 IsEmpty]: Start isEmpty. Operand 144 states and 184 transitions. [2021-11-23 03:23:38,924 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-11-23 03:23:38,924 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:23:38,924 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:23:38,925 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2021-11-23 03:23:38,925 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting errorFnErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorFnErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:23:38,925 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:23:38,926 INFO L85 PathProgramCache]: Analyzing trace with hash -871110700, now seen corresponding path program 1 times [2021-11-23 03:23:38,926 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:23:38,926 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1035478548] [2021-11-23 03:23:38,926 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:23:38,926 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:23:38,958 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:23:39,075 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:23:39,076 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:23:39,076 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1035478548] [2021-11-23 03:23:39,076 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1035478548] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:23:39,076 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 03:23:39,077 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 03:23:39,077 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1754989915] [2021-11-23 03:23:39,077 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:23:39,077 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 03:23:39,078 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:23:39,078 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 03:23:39,078 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 03:23:39,079 INFO L87 Difference]: Start difference. First operand 144 states and 184 transitions. Second operand has 4 states, 4 states have (on average 7.0) internal successors, (28), 3 states have internal predecessors, (28), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:23:41,090 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 03:23:42,979 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:23:42,979 INFO L93 Difference]: Finished difference Result 179 states and 226 transitions. [2021-11-23 03:23:42,980 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 03:23:42,980 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 7.0) internal successors, (28), 3 states have internal predecessors, (28), 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 29 [2021-11-23 03:23:42,980 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:23:42,981 INFO L225 Difference]: With dead ends: 179 [2021-11-23 03:23:42,982 INFO L226 Difference]: Without dead ends: 110 [2021-11-23 03:23:42,982 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-23 03:23:42,983 INFO L933 BasicCegarLoop]: 142 mSDtfsCounter, 184 mSDsluCounter, 94 mSDsCounter, 0 mSdLazyCounter, 125 mSolverCounterSat, 15 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 192 SdHoareTripleChecker+Valid, 214 SdHoareTripleChecker+Invalid, 141 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 15 IncrementalHoareTripleChecker+Valid, 125 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.9s IncrementalHoareTripleChecker+Time [2021-11-23 03:23:42,983 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [192 Valid, 214 Invalid, 141 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [15 Valid, 125 Invalid, 1 Unknown, 0 Unchecked, 3.9s Time] [2021-11-23 03:23:42,984 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 110 states. [2021-11-23 03:23:42,993 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 110 to 93. [2021-11-23 03:23:42,993 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 93 states, 77 states have (on average 1.3246753246753247) internal successors, (102), 80 states have internal predecessors, (102), 10 states have call successors, (10), 7 states have call predecessors, (10), 5 states have return successors, (6), 5 states have call predecessors, (6), 6 states have call successors, (6) [2021-11-23 03:23:42,994 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 118 transitions. [2021-11-23 03:23:42,994 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 118 transitions. Word has length 29 [2021-11-23 03:23:42,995 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:23:42,995 INFO L470 AbstractCegarLoop]: Abstraction has 93 states and 118 transitions. [2021-11-23 03:23:42,995 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 7.0) internal successors, (28), 3 states have internal predecessors, (28), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:23:42,995 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 118 transitions. [2021-11-23 03:23:42,996 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2021-11-23 03:23:42,996 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:23:42,996 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:23:42,996 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2021-11-23 03:23:42,997 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting errorFnErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorFnErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:23:42,997 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:23:42,997 INFO L85 PathProgramCache]: Analyzing trace with hash -1598042042, now seen corresponding path program 1 times [2021-11-23 03:23:42,998 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:23:42,998 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [678739321] [2021-11-23 03:23:42,998 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:23:42,998 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:23:43,032 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:23:43,082 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:23:43,083 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:23:43,083 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [678739321] [2021-11-23 03:23:43,083 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [678739321] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:23:43,083 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 03:23:43,084 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 03:23:43,084 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [436212582] [2021-11-23 03:23:43,084 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:23:43,085 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 03:23:43,085 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:23:43,085 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 03:23:43,085 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 03:23:43,086 INFO L87 Difference]: Start difference. First operand 93 states and 118 transitions. Second operand has 3 states, 3 states have (on average 9.0) internal successors, (27), 3 states have internal predecessors, (27), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2021-11-23 03:23:45,098 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 03:23:46,375 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:23:46,375 INFO L93 Difference]: Finished difference Result 130 states and 162 transitions. [2021-11-23 03:23:46,375 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 03:23:46,375 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 9.0) internal successors, (27), 3 states have internal predecessors, (27), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) Word has length 33 [2021-11-23 03:23:46,376 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:23:46,377 INFO L225 Difference]: With dead ends: 130 [2021-11-23 03:23:46,377 INFO L226 Difference]: Without dead ends: 91 [2021-11-23 03:23:46,377 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 03:23:46,378 INFO L933 BasicCegarLoop]: 83 mSDtfsCounter, 0 mSDsluCounter, 79 mSDsCounter, 0 mSdLazyCounter, 56 mSolverCounterSat, 0 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 147 SdHoareTripleChecker+Invalid, 57 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 56 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.3s IncrementalHoareTripleChecker+Time [2021-11-23 03:23:46,379 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 147 Invalid, 57 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 56 Invalid, 1 Unknown, 0 Unchecked, 3.3s Time] [2021-11-23 03:23:46,380 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 91 states. [2021-11-23 03:23:46,387 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 91 to 91. [2021-11-23 03:23:46,388 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 91 states, 76 states have (on average 1.3026315789473684) internal successors, (99), 78 states have internal predecessors, (99), 9 states have call successors, (9), 7 states have call predecessors, (9), 5 states have return successors, (6), 5 states have call predecessors, (6), 6 states have call successors, (6) [2021-11-23 03:23:46,389 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 114 transitions. [2021-11-23 03:23:46,389 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 114 transitions. Word has length 33 [2021-11-23 03:23:46,390 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:23:46,390 INFO L470 AbstractCegarLoop]: Abstraction has 91 states and 114 transitions. [2021-11-23 03:23:46,390 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 9.0) internal successors, (27), 3 states have internal predecessors, (27), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2021-11-23 03:23:46,390 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 114 transitions. [2021-11-23 03:23:46,391 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2021-11-23 03:23:46,391 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:23:46,391 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:23:46,391 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2021-11-23 03:23:46,392 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting errorFnErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorFnErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:23:46,392 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:23:46,392 INFO L85 PathProgramCache]: Analyzing trace with hash 954974092, now seen corresponding path program 1 times [2021-11-23 03:23:46,393 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:23:46,393 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1870258959] [2021-11-23 03:23:46,393 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:23:46,393 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:23:46,429 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:23:46,554 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:23:46,554 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:23:46,555 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1870258959] [2021-11-23 03:23:46,555 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1870258959] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:23:46,555 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 03:23:46,555 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 03:23:46,555 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2034938405] [2021-11-23 03:23:46,555 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:23:46,556 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 03:23:46,556 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:23:46,557 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 03:23:46,557 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-23 03:23:46,557 INFO L87 Difference]: Start difference. First operand 91 states and 114 transitions. Second operand has 5 states, 5 states have (on average 6.0) internal successors, (30), 5 states have internal predecessors, (30), 2 states have call successors, (2), 2 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 03:23:48,569 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 03:23:52,858 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:23:52,859 INFO L93 Difference]: Finished difference Result 99 states and 120 transitions. [2021-11-23 03:23:52,859 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 03:23:52,859 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 6.0) internal successors, (30), 5 states have internal predecessors, (30), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 33 [2021-11-23 03:23:52,860 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:23:52,860 INFO L225 Difference]: With dead ends: 99 [2021-11-23 03:23:52,861 INFO L226 Difference]: Without dead ends: 93 [2021-11-23 03:23:52,861 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-11-23 03:23:52,861 INFO L933 BasicCegarLoop]: 76 mSDtfsCounter, 109 mSDsluCounter, 116 mSDsCounter, 0 mSdLazyCounter, 99 mSolverCounterSat, 7 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 6.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 111 SdHoareTripleChecker+Valid, 166 SdHoareTripleChecker+Invalid, 107 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 99 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 6.3s IncrementalHoareTripleChecker+Time [2021-11-23 03:23:52,862 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [111 Valid, 166 Invalid, 107 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 99 Invalid, 1 Unknown, 0 Unchecked, 6.3s Time] [2021-11-23 03:23:52,863 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2021-11-23 03:23:52,891 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 91. [2021-11-23 03:23:52,891 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 91 states, 76 states have (on average 1.2894736842105263) internal successors, (98), 78 states have internal predecessors, (98), 9 states have call successors, (9), 7 states have call predecessors, (9), 5 states have return successors, (6), 5 states have call predecessors, (6), 6 states have call successors, (6) [2021-11-23 03:23:52,892 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 113 transitions. [2021-11-23 03:23:52,892 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 113 transitions. Word has length 33 [2021-11-23 03:23:52,893 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:23:52,893 INFO L470 AbstractCegarLoop]: Abstraction has 91 states and 113 transitions. [2021-11-23 03:23:52,893 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 6.0) internal successors, (30), 5 states have internal predecessors, (30), 2 states have call successors, (2), 2 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 03:23:52,893 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 113 transitions. [2021-11-23 03:23:52,895 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2021-11-23 03:23:52,895 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:23:52,895 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:23:52,895 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2021-11-23 03:23:52,895 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting errorFnErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorFnErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:23:52,895 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:23:52,896 INFO L85 PathProgramCache]: Analyzing trace with hash 2045537895, now seen corresponding path program 1 times [2021-11-23 03:23:52,896 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:23:52,896 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [231270038] [2021-11-23 03:23:52,896 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:23:52,896 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:23:52,943 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:23:52,999 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:23:53,000 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:23:53,000 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [231270038] [2021-11-23 03:23:53,000 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [231270038] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:23:53,000 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 03:23:53,000 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 03:23:53,001 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [849164217] [2021-11-23 03:23:53,001 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:23:53,001 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 03:23:53,001 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:23:53,002 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 03:23:53,002 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 03:23:53,002 INFO L87 Difference]: Start difference. First operand 91 states and 113 transitions. Second operand has 4 states, 4 states have (on average 7.25) internal successors, (29), 4 states have internal predecessors, (29), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-23 03:23:55,014 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 03:23:59,337 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:23:59,337 INFO L93 Difference]: Finished difference Result 178 states and 220 transitions. [2021-11-23 03:23:59,337 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 03:23:59,337 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 7.25) internal successors, (29), 4 states have internal predecessors, (29), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 35 [2021-11-23 03:23:59,337 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:23:59,338 INFO L225 Difference]: With dead ends: 178 [2021-11-23 03:23:59,338 INFO L226 Difference]: Without dead ends: 91 [2021-11-23 03:23:59,339 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-23 03:23:59,339 INFO L933 BasicCegarLoop]: 83 mSDtfsCounter, 1 mSDsluCounter, 191 mSDsCounter, 0 mSdLazyCounter, 58 mSolverCounterSat, 0 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 6.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 244 SdHoareTripleChecker+Invalid, 59 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 58 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 6.3s IncrementalHoareTripleChecker+Time [2021-11-23 03:23:59,340 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1 Valid, 244 Invalid, 59 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 58 Invalid, 1 Unknown, 0 Unchecked, 6.3s Time] [2021-11-23 03:23:59,340 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 91 states. [2021-11-23 03:23:59,349 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 91 to 91. [2021-11-23 03:23:59,349 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 91 states, 76 states have (on average 1.2763157894736843) internal successors, (97), 78 states have internal predecessors, (97), 9 states have call successors, (9), 7 states have call predecessors, (9), 5 states have return successors, (6), 5 states have call predecessors, (6), 6 states have call successors, (6) [2021-11-23 03:23:59,350 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 91 states to 91 states and 112 transitions. [2021-11-23 03:23:59,351 INFO L78 Accepts]: Start accepts. Automaton has 91 states and 112 transitions. Word has length 35 [2021-11-23 03:23:59,351 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:23:59,351 INFO L470 AbstractCegarLoop]: Abstraction has 91 states and 112 transitions. [2021-11-23 03:23:59,351 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 7.25) internal successors, (29), 4 states have internal predecessors, (29), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-23 03:23:59,351 INFO L276 IsEmpty]: Start isEmpty. Operand 91 states and 112 transitions. [2021-11-23 03:23:59,352 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2021-11-23 03:23:59,352 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:23:59,352 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:23:59,353 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2021-11-23 03:23:59,353 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting errorFnErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorFnErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:23:59,353 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:23:59,353 INFO L85 PathProgramCache]: Analyzing trace with hash -1449297037, now seen corresponding path program 1 times [2021-11-23 03:23:59,354 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:23:59,354 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [290301712] [2021-11-23 03:23:59,354 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:23:59,354 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:23:59,899 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:23:59,957 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:23:59,957 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:23:59,957 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [290301712] [2021-11-23 03:23:59,958 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [290301712] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:23:59,958 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 03:23:59,958 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 03:23:59,958 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1581401486] [2021-11-23 03:23:59,958 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:23:59,959 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 03:23:59,959 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:23:59,960 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 03:23:59,960 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 03:23:59,960 INFO L87 Difference]: Start difference. First operand 91 states and 112 transitions. Second operand has 3 states, 3 states have (on average 10.0) internal successors, (30), 3 states have internal predecessors, (30), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-23 03:24:01,974 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 03:24:03,910 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:24:03,911 INFO L93 Difference]: Finished difference Result 179 states and 221 transitions. [2021-11-23 03:24:03,911 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 03:24:03,911 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 10.0) internal successors, (30), 3 states have internal predecessors, (30), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 36 [2021-11-23 03:24:03,911 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:24:03,912 INFO L225 Difference]: With dead ends: 179 [2021-11-23 03:24:03,912 INFO L226 Difference]: Without dead ends: 92 [2021-11-23 03:24:03,912 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 03:24:03,913 INFO L933 BasicCegarLoop]: 81 mSDtfsCounter, 0 mSDsluCounter, 97 mSDsCounter, 0 mSdLazyCounter, 38 mSolverCounterSat, 0 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 161 SdHoareTripleChecker+Invalid, 39 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 38 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.9s IncrementalHoareTripleChecker+Time [2021-11-23 03:24:03,914 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 161 Invalid, 39 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 38 Invalid, 1 Unknown, 0 Unchecked, 3.9s Time] [2021-11-23 03:24:03,915 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 92 states. [2021-11-23 03:24:03,923 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 92 to 92. [2021-11-23 03:24:03,924 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 92 states, 77 states have (on average 1.2727272727272727) internal successors, (98), 79 states have internal predecessors, (98), 9 states have call successors, (9), 7 states have call predecessors, (9), 5 states have return successors, (6), 5 states have call predecessors, (6), 6 states have call successors, (6) [2021-11-23 03:24:03,924 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 92 states to 92 states and 113 transitions. [2021-11-23 03:24:03,925 INFO L78 Accepts]: Start accepts. Automaton has 92 states and 113 transitions. Word has length 36 [2021-11-23 03:24:03,925 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:24:03,925 INFO L470 AbstractCegarLoop]: Abstraction has 92 states and 113 transitions. [2021-11-23 03:24:03,925 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 10.0) internal successors, (30), 3 states have internal predecessors, (30), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-23 03:24:03,926 INFO L276 IsEmpty]: Start isEmpty. Operand 92 states and 113 transitions. [2021-11-23 03:24:03,926 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2021-11-23 03:24:03,926 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:24:03,927 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:24:03,927 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2021-11-23 03:24:03,927 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting errorFnErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorFnErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:24:03,927 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:24:03,928 INFO L85 PathProgramCache]: Analyzing trace with hash -1323360196, now seen corresponding path program 1 times [2021-11-23 03:24:03,928 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:24:03,928 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1827608220] [2021-11-23 03:24:03,928 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:24:03,928 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:24:04,202 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:24:04,324 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:24:04,325 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:24:04,325 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1827608220] [2021-11-23 03:24:04,325 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1827608220] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:24:04,325 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [592071584] [2021-11-23 03:24:04,325 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:24:04,326 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:24:04,326 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:24:04,331 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:24:04,350 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-23 03:24:04,613 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:24:04,618 INFO L263 TraceCheckSpWp]: Trace formula consists of 624 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 03:24:04,625 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:24:04,748 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 03:24:04,748 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 03:24:04,749 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [592071584] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:24:04,749 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 03:24:04,749 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [4] total 7 [2021-11-23 03:24:04,749 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [308729897] [2021-11-23 03:24:04,750 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:24:04,750 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 03:24:04,750 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:24:04,751 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 03:24:04,751 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-11-23 03:24:04,751 INFO L87 Difference]: Start difference. First operand 92 states and 113 transitions. Second operand has 5 states, 4 states have (on average 7.75) internal successors, (31), 4 states have internal predecessors, (31), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2021-11-23 03:24:06,764 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 03:24:09,877 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:24:09,877 INFO L93 Difference]: Finished difference Result 129 states and 156 transitions. [2021-11-23 03:24:09,880 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 03:24:09,880 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 7.75) internal successors, (31), 4 states have internal predecessors, (31), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) Word has length 37 [2021-11-23 03:24:09,880 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:24:09,881 INFO L225 Difference]: With dead ends: 129 [2021-11-23 03:24:09,881 INFO L226 Difference]: Without dead ends: 90 [2021-11-23 03:24:09,881 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 35 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-11-23 03:24:09,882 INFO L933 BasicCegarLoop]: 79 mSDtfsCounter, 6 mSDsluCounter, 282 mSDsCounter, 0 mSdLazyCounter, 75 mSolverCounterSat, 0 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 5.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 311 SdHoareTripleChecker+Invalid, 76 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 75 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 5.1s IncrementalHoareTripleChecker+Time [2021-11-23 03:24:09,882 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [7 Valid, 311 Invalid, 76 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 75 Invalid, 1 Unknown, 0 Unchecked, 5.1s Time] [2021-11-23 03:24:09,883 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2021-11-23 03:24:09,894 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 90. [2021-11-23 03:24:09,895 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 90 states, 75 states have (on average 1.2666666666666666) internal successors, (95), 77 states have internal predecessors, (95), 9 states have call successors, (9), 7 states have call predecessors, (9), 5 states have return successors, (6), 5 states have call predecessors, (6), 6 states have call successors, (6) [2021-11-23 03:24:09,895 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 90 states to 90 states and 110 transitions. [2021-11-23 03:24:09,896 INFO L78 Accepts]: Start accepts. Automaton has 90 states and 110 transitions. Word has length 37 [2021-11-23 03:24:09,897 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:24:09,897 INFO L470 AbstractCegarLoop]: Abstraction has 90 states and 110 transitions. [2021-11-23 03:24:09,897 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 7.75) internal successors, (31), 4 states have internal predecessors, (31), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2021-11-23 03:24:09,897 INFO L276 IsEmpty]: Start isEmpty. Operand 90 states and 110 transitions. [2021-11-23 03:24:09,898 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2021-11-23 03:24:09,898 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:24:09,898 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:24:09,937 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-23 03:24:10,121 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2021-11-23 03:24:10,121 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting errorFnErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorFnErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:24:10,121 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:24:10,122 INFO L85 PathProgramCache]: Analyzing trace with hash -734586878, now seen corresponding path program 1 times [2021-11-23 03:24:10,122 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:24:10,122 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1948703437] [2021-11-23 03:24:10,122 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:24:10,122 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:24:10,152 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:24:10,229 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 03:24:10,230 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:24:10,230 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1948703437] [2021-11-23 03:24:10,230 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1948703437] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:24:10,231 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 03:24:10,231 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 03:24:10,231 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1946344541] [2021-11-23 03:24:10,231 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:24:10,232 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 03:24:10,232 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:24:10,232 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 03:24:10,232 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-23 03:24:10,233 INFO L87 Difference]: Start difference. First operand 90 states and 110 transitions. Second operand has 5 states, 5 states have (on average 6.6) internal successors, (33), 5 states have internal predecessors, (33), 2 states have call successors, (2), 2 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 03:24:12,244 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 03:24:13,410 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.11s for a HTC check with result INVALID. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 03:24:17,490 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 03:24:18,016 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:24:18,016 INFO L93 Difference]: Finished difference Result 105 states and 124 transitions. [2021-11-23 03:24:18,016 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 03:24:18,016 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 6.6) internal successors, (33), 5 states have internal predecessors, (33), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 36 [2021-11-23 03:24:18,017 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:24:18,017 INFO L225 Difference]: With dead ends: 105 [2021-11-23 03:24:18,017 INFO L226 Difference]: Without dead ends: 69 [2021-11-23 03:24:18,018 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2021-11-23 03:24:18,018 INFO L933 BasicCegarLoop]: 78 mSDtfsCounter, 23 mSDsluCounter, 278 mSDsCounter, 0 mSdLazyCounter, 80 mSolverCounterSat, 1 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 7.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 23 SdHoareTripleChecker+Valid, 310 SdHoareTripleChecker+Invalid, 83 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 80 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 7.7s IncrementalHoareTripleChecker+Time [2021-11-23 03:24:18,019 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [23 Valid, 310 Invalid, 83 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 80 Invalid, 2 Unknown, 0 Unchecked, 7.7s Time] [2021-11-23 03:24:18,019 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2021-11-23 03:24:18,027 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 69. [2021-11-23 03:24:18,027 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 69 states, 56 states have (on average 1.1785714285714286) internal successors, (66), 58 states have internal predecessors, (66), 8 states have call successors, (8), 6 states have call predecessors, (8), 4 states have return successors, (5), 4 states have call predecessors, (5), 5 states have call successors, (5) [2021-11-23 03:24:18,028 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 79 transitions. [2021-11-23 03:24:18,028 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 79 transitions. Word has length 36 [2021-11-23 03:24:18,028 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:24:18,028 INFO L470 AbstractCegarLoop]: Abstraction has 69 states and 79 transitions. [2021-11-23 03:24:18,029 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 6.6) internal successors, (33), 5 states have internal predecessors, (33), 2 states have call successors, (2), 2 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 03:24:18,029 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 79 transitions. [2021-11-23 03:24:18,029 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2021-11-23 03:24:18,029 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:24:18,030 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:24:18,030 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2021-11-23 03:24:18,030 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting errorFnErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorFnErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:24:18,030 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:24:18,031 INFO L85 PathProgramCache]: Analyzing trace with hash 1469043701, now seen corresponding path program 1 times [2021-11-23 03:24:18,031 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:24:18,031 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [888782485] [2021-11-23 03:24:18,031 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:24:18,031 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:24:18,069 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:24:18,197 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 03:24:18,197 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:24:18,198 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [888782485] [2021-11-23 03:24:18,198 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [888782485] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:24:18,198 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 03:24:18,198 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-23 03:24:18,198 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1747206085] [2021-11-23 03:24:18,199 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:24:18,200 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 03:24:18,200 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:24:18,200 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 03:24:18,200 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-23 03:24:18,201 INFO L87 Difference]: Start difference. First operand 69 states and 79 transitions. Second operand has 5 states, 5 states have (on average 6.6) internal successors, (33), 5 states have internal predecessors, (33), 3 states have call successors, (5), 2 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-11-23 03:24:20,213 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 03:24:22,260 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:24:22,260 INFO L93 Difference]: Finished difference Result 108 states and 123 transitions. [2021-11-23 03:24:22,261 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 03:24:22,261 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 6.6) internal successors, (33), 5 states have internal predecessors, (33), 3 states have call successors, (5), 2 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) Word has length 41 [2021-11-23 03:24:22,261 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:24:22,262 INFO L225 Difference]: With dead ends: 108 [2021-11-23 03:24:22,262 INFO L226 Difference]: Without dead ends: 71 [2021-11-23 03:24:22,262 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-23 03:24:22,263 INFO L933 BasicCegarLoop]: 50 mSDtfsCounter, 53 mSDsluCounter, 88 mSDsCounter, 0 mSdLazyCounter, 88 mSolverCounterSat, 5 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 54 SdHoareTripleChecker+Valid, 117 SdHoareTripleChecker+Invalid, 94 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 88 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.0s IncrementalHoareTripleChecker+Time [2021-11-23 03:24:22,263 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [54 Valid, 117 Invalid, 94 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 88 Invalid, 1 Unknown, 0 Unchecked, 4.0s Time] [2021-11-23 03:24:22,264 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2021-11-23 03:24:22,272 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 69. [2021-11-23 03:24:22,272 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 69 states, 56 states have (on average 1.1607142857142858) internal successors, (65), 58 states have internal predecessors, (65), 8 states have call successors, (8), 6 states have call predecessors, (8), 4 states have return successors, (5), 4 states have call predecessors, (5), 5 states have call successors, (5) [2021-11-23 03:24:22,273 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 78 transitions. [2021-11-23 03:24:22,273 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 78 transitions. Word has length 41 [2021-11-23 03:24:22,273 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:24:22,274 INFO L470 AbstractCegarLoop]: Abstraction has 69 states and 78 transitions. [2021-11-23 03:24:22,274 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 6.6) internal successors, (33), 5 states have internal predecessors, (33), 3 states have call successors, (5), 2 states have call predecessors, (5), 3 states have return successors, (3), 3 states have call predecessors, (3), 2 states have call successors, (3) [2021-11-23 03:24:22,274 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 78 transitions. [2021-11-23 03:24:22,274 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2021-11-23 03:24:22,275 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:24:22,275 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:24:22,275 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2021-11-23 03:24:22,275 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting errorFnErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorFnErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:24:22,276 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:24:22,276 INFO L85 PathProgramCache]: Analyzing trace with hash -1339147194, now seen corresponding path program 1 times [2021-11-23 03:24:22,276 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:24:22,276 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1327624320] [2021-11-23 03:24:22,276 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:24:22,276 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:24:22,320 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:24:22,518 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 03:24:22,518 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:24:22,518 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1327624320] [2021-11-23 03:24:22,518 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1327624320] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:24:22,519 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 03:24:22,519 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-11-23 03:24:22,519 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1256599404] [2021-11-23 03:24:22,519 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:24:22,519 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-23 03:24:22,519 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:24:22,520 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-23 03:24:22,520 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2021-11-23 03:24:22,520 INFO L87 Difference]: Start difference. First operand 69 states and 78 transitions. Second operand has 7 states, 6 states have (on average 5.666666666666667) internal successors, (34), 6 states have internal predecessors, (34), 3 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2021-11-23 03:24:24,533 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 03:24:25,585 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:24:25,585 INFO L93 Difference]: Finished difference Result 76 states and 86 transitions. [2021-11-23 03:24:25,585 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 03:24:25,586 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 5.666666666666667) internal successors, (34), 6 states have internal predecessors, (34), 3 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) Word has length 42 [2021-11-23 03:24:25,586 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:24:25,587 INFO L225 Difference]: With dead ends: 76 [2021-11-23 03:24:25,587 INFO L226 Difference]: Without dead ends: 73 [2021-11-23 03:24:25,587 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=20, Invalid=36, Unknown=0, NotChecked=0, Total=56 [2021-11-23 03:24:25,588 INFO L933 BasicCegarLoop]: 44 mSDtfsCounter, 67 mSDsluCounter, 63 mSDsCounter, 0 mSdLazyCounter, 128 mSolverCounterSat, 19 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 67 SdHoareTripleChecker+Valid, 94 SdHoareTripleChecker+Invalid, 148 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 19 IncrementalHoareTripleChecker+Valid, 128 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.0s IncrementalHoareTripleChecker+Time [2021-11-23 03:24:25,588 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [67 Valid, 94 Invalid, 148 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [19 Valid, 128 Invalid, 1 Unknown, 0 Unchecked, 3.0s Time] [2021-11-23 03:24:25,589 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2021-11-23 03:24:25,597 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 69. [2021-11-23 03:24:25,597 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 69 states, 56 states have (on average 1.1607142857142858) internal successors, (65), 58 states have internal predecessors, (65), 8 states have call successors, (8), 6 states have call predecessors, (8), 4 states have return successors, (5), 4 states have call predecessors, (5), 5 states have call successors, (5) [2021-11-23 03:24:25,598 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 78 transitions. [2021-11-23 03:24:25,598 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 78 transitions. Word has length 42 [2021-11-23 03:24:25,599 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:24:25,599 INFO L470 AbstractCegarLoop]: Abstraction has 69 states and 78 transitions. [2021-11-23 03:24:25,599 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 5.666666666666667) internal successors, (34), 6 states have internal predecessors, (34), 3 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2021-11-23 03:24:25,599 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 78 transitions. [2021-11-23 03:24:25,600 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2021-11-23 03:24:25,600 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:24:25,600 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:24:25,600 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2021-11-23 03:24:25,600 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting errorFnErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorFnErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:24:25,601 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:24:25,601 INFO L85 PathProgramCache]: Analyzing trace with hash 1195445267, now seen corresponding path program 1 times [2021-11-23 03:24:25,601 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:24:25,601 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [672639214] [2021-11-23 03:24:25,601 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:24:25,602 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:24:25,637 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:24:25,681 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 03:24:25,681 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:24:25,681 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [672639214] [2021-11-23 03:24:25,682 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [672639214] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:24:25,682 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 03:24:25,682 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 03:24:25,682 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [667422327] [2021-11-23 03:24:25,682 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:24:25,683 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 03:24:25,683 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:24:25,683 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 03:24:25,683 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 03:24:25,684 INFO L87 Difference]: Start difference. First operand 69 states and 78 transitions. Second operand has 3 states, 3 states have (on average 11.333333333333334) internal successors, (34), 3 states have internal predecessors, (34), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) [2021-11-23 03:24:27,697 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 03:24:28,461 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:24:28,461 INFO L93 Difference]: Finished difference Result 76 states and 85 transitions. [2021-11-23 03:24:28,461 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 03:24:28,462 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 11.333333333333334) internal successors, (34), 3 states have internal predecessors, (34), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) Word has length 41 [2021-11-23 03:24:28,462 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:24:28,462 INFO L225 Difference]: With dead ends: 76 [2021-11-23 03:24:28,463 INFO L226 Difference]: Without dead ends: 73 [2021-11-23 03:24:28,463 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 03:24:28,464 INFO L933 BasicCegarLoop]: 58 mSDtfsCounter, 8 mSDsluCounter, 50 mSDsCounter, 0 mSdLazyCounter, 48 mSolverCounterSat, 1 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8 SdHoareTripleChecker+Valid, 97 SdHoareTripleChecker+Invalid, 50 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 48 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.8s IncrementalHoareTripleChecker+Time [2021-11-23 03:24:28,464 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [8 Valid, 97 Invalid, 50 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 48 Invalid, 1 Unknown, 0 Unchecked, 2.8s Time] [2021-11-23 03:24:28,465 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 73 states. [2021-11-23 03:24:28,473 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 73 to 71. [2021-11-23 03:24:28,473 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 71 states, 58 states have (on average 1.1724137931034482) internal successors, (68), 60 states have internal predecessors, (68), 8 states have call successors, (8), 6 states have call predecessors, (8), 4 states have return successors, (5), 4 states have call predecessors, (5), 5 states have call successors, (5) [2021-11-23 03:24:28,474 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 81 transitions. [2021-11-23 03:24:28,474 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 81 transitions. Word has length 41 [2021-11-23 03:24:28,474 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:24:28,474 INFO L470 AbstractCegarLoop]: Abstraction has 71 states and 81 transitions. [2021-11-23 03:24:28,475 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 11.333333333333334) internal successors, (34), 3 states have internal predecessors, (34), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) [2021-11-23 03:24:28,475 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 81 transitions. [2021-11-23 03:24:28,475 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2021-11-23 03:24:28,476 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:24:28,476 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:24:28,476 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2021-11-23 03:24:28,476 INFO L402 AbstractCegarLoop]: === Iteration 22 === Targeting errorFnErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorFnErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:24:28,476 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:24:28,477 INFO L85 PathProgramCache]: Analyzing trace with hash -1833709769, now seen corresponding path program 1 times [2021-11-23 03:24:28,477 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:24:28,477 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1694646376] [2021-11-23 03:24:28,477 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:24:28,477 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:24:28,516 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:24:28,570 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 03:24:28,571 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:24:28,571 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1694646376] [2021-11-23 03:24:28,571 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1694646376] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:24:28,571 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 03:24:28,571 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 03:24:28,572 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [259639649] [2021-11-23 03:24:28,572 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:24:28,572 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 03:24:28,572 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:24:28,573 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 03:24:28,573 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 03:24:28,573 INFO L87 Difference]: Start difference. First operand 71 states and 81 transitions. Second operand has 3 states, 3 states have (on average 11.666666666666666) internal successors, (35), 3 states have internal predecessors, (35), 3 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (3), 1 states have call predecessors, (3), 2 states have call successors, (3) [2021-11-23 03:24:30,585 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 03:24:31,674 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.05s for a HTC check with result INVALID. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 03:24:31,957 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:24:31,957 INFO L93 Difference]: Finished difference Result 121 states and 131 transitions. [2021-11-23 03:24:31,958 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 03:24:31,958 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 11.666666666666666) internal successors, (35), 3 states have internal predecessors, (35), 3 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (3), 1 states have call predecessors, (3), 2 states have call successors, (3) Word has length 42 [2021-11-23 03:24:31,958 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:24:31,959 INFO L225 Difference]: With dead ends: 121 [2021-11-23 03:24:31,959 INFO L226 Difference]: Without dead ends: 90 [2021-11-23 03:24:31,959 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 03:24:31,960 INFO L933 BasicCegarLoop]: 53 mSDtfsCounter, 31 mSDsluCounter, 41 mSDsCounter, 0 mSdLazyCounter, 27 mSolverCounterSat, 0 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 31 SdHoareTripleChecker+Valid, 86 SdHoareTripleChecker+Invalid, 28 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 27 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.4s IncrementalHoareTripleChecker+Time [2021-11-23 03:24:31,961 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [31 Valid, 86 Invalid, 28 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 27 Invalid, 1 Unknown, 0 Unchecked, 3.4s Time] [2021-11-23 03:24:31,961 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2021-11-23 03:24:31,971 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 75. [2021-11-23 03:24:31,971 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 75 states, 61 states have (on average 1.1147540983606556) internal successors, (68), 63 states have internal predecessors, (68), 8 states have call successors, (8), 7 states have call predecessors, (8), 5 states have return successors, (6), 4 states have call predecessors, (6), 6 states have call successors, (6) [2021-11-23 03:24:31,972 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 82 transitions. [2021-11-23 03:24:31,972 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 82 transitions. Word has length 42 [2021-11-23 03:24:31,972 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:24:31,973 INFO L470 AbstractCegarLoop]: Abstraction has 75 states and 82 transitions. [2021-11-23 03:24:31,973 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 11.666666666666666) internal successors, (35), 3 states have internal predecessors, (35), 3 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (3), 1 states have call predecessors, (3), 2 states have call successors, (3) [2021-11-23 03:24:31,973 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 82 transitions. [2021-11-23 03:24:31,974 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2021-11-23 03:24:31,974 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:24:31,974 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:24:31,974 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2021-11-23 03:24:31,974 INFO L402 AbstractCegarLoop]: === Iteration 23 === Targeting errorFnErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorFnErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:24:31,975 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:24:31,975 INFO L85 PathProgramCache]: Analyzing trace with hash 2046456820, now seen corresponding path program 1 times [2021-11-23 03:24:31,975 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:24:31,975 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [159230835] [2021-11-23 03:24:31,976 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:24:31,976 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:24:32,017 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:24:32,086 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 03:24:32,086 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:24:32,086 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [159230835] [2021-11-23 03:24:32,087 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [159230835] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:24:32,087 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 03:24:32,087 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 03:24:32,087 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1331628206] [2021-11-23 03:24:32,087 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:24:32,088 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 03:24:32,088 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:24:32,088 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 03:24:32,088 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-23 03:24:32,089 INFO L87 Difference]: Start difference. First operand 75 states and 82 transitions. Second operand has 4 states, 4 states have (on average 9.5) internal successors, (38), 4 states have internal predecessors, (38), 3 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2021-11-23 03:24:34,102 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 03:24:36,064 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.92s for a HTC check with result INVALID. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 03:24:36,264 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:24:36,264 INFO L93 Difference]: Finished difference Result 81 states and 88 transitions. [2021-11-23 03:24:36,265 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 03:24:36,265 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 9.5) internal successors, (38), 4 states have internal predecessors, (38), 3 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) Word has length 46 [2021-11-23 03:24:36,265 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:24:36,266 INFO L225 Difference]: With dead ends: 81 [2021-11-23 03:24:36,266 INFO L226 Difference]: Without dead ends: 78 [2021-11-23 03:24:36,266 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-23 03:24:36,267 INFO L933 BasicCegarLoop]: 45 mSDtfsCounter, 55 mSDsluCounter, 18 mSDsCounter, 0 mSdLazyCounter, 46 mSolverCounterSat, 12 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 55 SdHoareTripleChecker+Valid, 58 SdHoareTripleChecker+Invalid, 59 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 46 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.2s IncrementalHoareTripleChecker+Time [2021-11-23 03:24:36,267 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [55 Valid, 58 Invalid, 59 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 46 Invalid, 1 Unknown, 0 Unchecked, 4.2s Time] [2021-11-23 03:24:36,268 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2021-11-23 03:24:36,275 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 62. [2021-11-23 03:24:36,276 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 62 states, 52 states have (on average 1.1153846153846154) internal successors, (58), 52 states have internal predecessors, (58), 5 states have call successors, (5), 5 states have call predecessors, (5), 4 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-11-23 03:24:36,276 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 67 transitions. [2021-11-23 03:24:36,276 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 67 transitions. Word has length 46 [2021-11-23 03:24:36,277 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:24:36,277 INFO L470 AbstractCegarLoop]: Abstraction has 62 states and 67 transitions. [2021-11-23 03:24:36,277 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 9.5) internal successors, (38), 4 states have internal predecessors, (38), 3 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2021-11-23 03:24:36,277 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 67 transitions. [2021-11-23 03:24:36,278 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2021-11-23 03:24:36,278 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:24:36,278 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:24:36,278 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22 [2021-11-23 03:24:36,278 INFO L402 AbstractCegarLoop]: === Iteration 24 === Targeting errorFnErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorFnErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:24:36,279 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:24:36,279 INFO L85 PathProgramCache]: Analyzing trace with hash -143767182, now seen corresponding path program 1 times [2021-11-23 03:24:36,279 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:24:36,279 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1552317993] [2021-11-23 03:24:36,280 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:24:36,280 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:24:36,318 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:24:36,401 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 03:24:36,401 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:24:36,402 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1552317993] [2021-11-23 03:24:36,402 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1552317993] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:24:36,402 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 03:24:36,402 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 03:24:36,402 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1359225234] [2021-11-23 03:24:36,403 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:24:36,403 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 03:24:36,403 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:24:36,404 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 03:24:36,404 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 03:24:36,404 INFO L87 Difference]: Start difference. First operand 62 states and 67 transitions. Second operand has 4 states, 4 states have (on average 11.75) internal successors, (47), 4 states have internal predecessors, (47), 3 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2021-11-23 03:24:38,419 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 03:24:40,021 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.25s for a HTC check with result INVALID. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 03:24:40,871 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:24:40,871 INFO L93 Difference]: Finished difference Result 79 states and 84 transitions. [2021-11-23 03:24:40,872 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 03:24:40,872 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 11.75) internal successors, (47), 4 states have internal predecessors, (47), 3 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) Word has length 56 [2021-11-23 03:24:40,872 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:24:40,873 INFO L225 Difference]: With dead ends: 79 [2021-11-23 03:24:40,874 INFO L226 Difference]: Without dead ends: 62 [2021-11-23 03:24:40,874 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-23 03:24:40,875 INFO L933 BasicCegarLoop]: 51 mSDtfsCounter, 19 mSDsluCounter, 109 mSDsCounter, 0 mSdLazyCounter, 45 mSolverCounterSat, 1 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 20 SdHoareTripleChecker+Valid, 141 SdHoareTripleChecker+Invalid, 47 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 45 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.4s IncrementalHoareTripleChecker+Time [2021-11-23 03:24:40,876 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [20 Valid, 141 Invalid, 47 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 45 Invalid, 1 Unknown, 0 Unchecked, 4.4s Time] [2021-11-23 03:24:40,881 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2021-11-23 03:24:40,888 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 62. [2021-11-23 03:24:40,888 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 62 states, 52 states have (on average 1.0961538461538463) internal successors, (57), 52 states have internal predecessors, (57), 5 states have call successors, (5), 5 states have call predecessors, (5), 4 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-11-23 03:24:40,889 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 66 transitions. [2021-11-23 03:24:40,889 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 66 transitions. Word has length 56 [2021-11-23 03:24:40,889 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:24:40,890 INFO L470 AbstractCegarLoop]: Abstraction has 62 states and 66 transitions. [2021-11-23 03:24:40,890 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 11.75) internal successors, (47), 4 states have internal predecessors, (47), 3 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2021-11-23 03:24:40,890 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 66 transitions. [2021-11-23 03:24:40,890 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2021-11-23 03:24:40,891 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:24:40,891 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:24:40,891 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23 [2021-11-23 03:24:40,891 INFO L402 AbstractCegarLoop]: === Iteration 25 === Targeting errorFnErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorFnErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:24:40,892 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:24:40,892 INFO L85 PathProgramCache]: Analyzing trace with hash 1603906980, now seen corresponding path program 1 times [2021-11-23 03:24:40,892 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:24:40,892 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [440219267] [2021-11-23 03:24:40,892 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:24:40,893 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:24:41,175 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:24:41,300 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:24:41,300 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:24:41,301 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [440219267] [2021-11-23 03:24:41,301 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [440219267] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:24:41,301 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1057303241] [2021-11-23 03:24:41,301 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:24:41,302 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:24:41,302 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:24:41,307 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:24:41,310 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-23 03:24:42,258 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:24:42,263 INFO L263 TraceCheckSpWp]: Trace formula consists of 702 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-23 03:24:42,266 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:24:42,394 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 03:24:42,394 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 03:24:42,394 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1057303241] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:24:42,394 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 03:24:42,394 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [4] total 5 [2021-11-23 03:24:42,395 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1670940015] [2021-11-23 03:24:42,395 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:24:42,395 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 03:24:42,395 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:24:42,396 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 03:24:42,396 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-23 03:24:42,396 INFO L87 Difference]: Start difference. First operand 62 states and 66 transitions. Second operand has 3 states, 3 states have (on average 16.666666666666668) internal successors, (50), 3 states have internal predecessors, (50), 1 states have call successors, (5), 1 states have call predecessors, (5), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) [2021-11-23 03:24:44,404 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 03:24:45,477 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:24:45,477 INFO L93 Difference]: Finished difference Result 112 states and 119 transitions. [2021-11-23 03:24:45,478 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 03:24:45,478 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 16.666666666666668) internal successors, (50), 3 states have internal predecessors, (50), 1 states have call successors, (5), 1 states have call predecessors, (5), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) Word has length 59 [2021-11-23 03:24:45,479 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:24:45,479 INFO L225 Difference]: With dead ends: 112 [2021-11-23 03:24:45,479 INFO L226 Difference]: Without dead ends: 63 [2021-11-23 03:24:45,480 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 59 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-23 03:24:45,481 INFO L933 BasicCegarLoop]: 49 mSDtfsCounter, 0 mSDsluCounter, 59 mSDsCounter, 0 mSdLazyCounter, 31 mSolverCounterSat, 0 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 96 SdHoareTripleChecker+Invalid, 32 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 31 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.1s IncrementalHoareTripleChecker+Time [2021-11-23 03:24:45,481 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 96 Invalid, 32 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 31 Invalid, 1 Unknown, 0 Unchecked, 3.1s Time] [2021-11-23 03:24:45,482 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2021-11-23 03:24:45,491 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 63. [2021-11-23 03:24:45,492 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 63 states, 53 states have (on average 1.0943396226415094) internal successors, (58), 53 states have internal predecessors, (58), 5 states have call successors, (5), 5 states have call predecessors, (5), 4 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-11-23 03:24:45,493 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 67 transitions. [2021-11-23 03:24:45,493 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 67 transitions. Word has length 59 [2021-11-23 03:24:45,493 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:24:45,493 INFO L470 AbstractCegarLoop]: Abstraction has 63 states and 67 transitions. [2021-11-23 03:24:45,494 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 16.666666666666668) internal successors, (50), 3 states have internal predecessors, (50), 1 states have call successors, (5), 1 states have call predecessors, (5), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) [2021-11-23 03:24:45,494 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 67 transitions. [2021-11-23 03:24:45,495 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2021-11-23 03:24:45,495 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:24:45,495 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:24:45,552 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-23 03:24:45,709 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:24:45,709 INFO L402 AbstractCegarLoop]: === Iteration 26 === Targeting errorFnErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorFnErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:24:45,709 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:24:45,709 INFO L85 PathProgramCache]: Analyzing trace with hash 371675837, now seen corresponding path program 1 times [2021-11-23 03:24:45,710 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:24:45,710 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [892480326] [2021-11-23 03:24:45,710 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:24:45,710 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:24:46,099 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:24:46,208 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 03:24:46,209 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:24:46,209 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [892480326] [2021-11-23 03:24:46,209 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [892480326] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:24:46,209 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [27708674] [2021-11-23 03:24:46,209 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:24:46,210 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:24:46,210 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:24:46,211 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:24:46,231 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-23 03:24:46,517 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:24:46,521 INFO L263 TraceCheckSpWp]: Trace formula consists of 726 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 03:24:46,525 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:24:46,701 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 03:24:46,701 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:24:46,874 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 03:24:46,874 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [27708674] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-23 03:24:46,874 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-23 03:24:46,875 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [4, 5] total 8 [2021-11-23 03:24:46,875 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1202650144] [2021-11-23 03:24:46,875 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:24:46,875 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 03:24:46,876 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:24:46,876 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 03:24:46,876 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2021-11-23 03:24:46,877 INFO L87 Difference]: Start difference. First operand 63 states and 67 transitions. Second operand has 4 states, 4 states have (on average 12.75) internal successors, (51), 4 states have internal predecessors, (51), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2021-11-23 03:24:48,889 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 03:24:50,391 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.45s for a HTC check with result INVALID. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 03:24:51,711 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.14s for a HTC check with result INVALID. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 03:24:51,867 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:24:51,868 INFO L93 Difference]: Finished difference Result 112 states and 118 transitions. [2021-11-23 03:24:51,868 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 03:24:51,868 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 12.75) internal successors, (51), 4 states have internal predecessors, (51), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) Word has length 60 [2021-11-23 03:24:51,868 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:24:51,869 INFO L225 Difference]: With dead ends: 112 [2021-11-23 03:24:51,869 INFO L226 Difference]: Without dead ends: 64 [2021-11-23 03:24:51,869 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 122 GetRequests, 116 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2021-11-23 03:24:51,870 INFO L933 BasicCegarLoop]: 47 mSDtfsCounter, 28 mSDsluCounter, 89 mSDsCounter, 0 mSdLazyCounter, 43 mSolverCounterSat, 2 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 30 SdHoareTripleChecker+Valid, 116 SdHoareTripleChecker+Invalid, 46 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 43 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 5.0s IncrementalHoareTripleChecker+Time [2021-11-23 03:24:51,871 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [30 Valid, 116 Invalid, 46 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 43 Invalid, 1 Unknown, 0 Unchecked, 5.0s Time] [2021-11-23 03:24:51,871 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2021-11-23 03:24:51,879 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 64. [2021-11-23 03:24:51,880 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 64 states, 54 states have (on average 1.0925925925925926) internal successors, (59), 54 states have internal predecessors, (59), 5 states have call successors, (5), 5 states have call predecessors, (5), 4 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-11-23 03:24:51,880 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 68 transitions. [2021-11-23 03:24:51,881 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 68 transitions. Word has length 60 [2021-11-23 03:24:51,881 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:24:51,881 INFO L470 AbstractCegarLoop]: Abstraction has 64 states and 68 transitions. [2021-11-23 03:24:51,881 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 12.75) internal successors, (51), 4 states have internal predecessors, (51), 2 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2021-11-23 03:24:51,881 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 68 transitions. [2021-11-23 03:24:51,882 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2021-11-23 03:24:51,882 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:24:51,882 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:24:51,907 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-23 03:24:52,090 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable25 [2021-11-23 03:24:52,091 INFO L402 AbstractCegarLoop]: === Iteration 27 === Targeting errorFnErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorFnErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:24:52,091 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:24:52,091 INFO L85 PathProgramCache]: Analyzing trace with hash 2060201350, now seen corresponding path program 1 times [2021-11-23 03:24:52,091 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:24:52,092 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [209309007] [2021-11-23 03:24:52,092 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:24:52,092 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:24:52,526 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:24:52,623 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 03:24:52,624 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:24:52,624 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [209309007] [2021-11-23 03:24:52,624 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [209309007] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:24:52,624 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1219245378] [2021-11-23 03:24:52,624 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:24:52,625 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:24:52,625 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:24:52,626 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:24:52,643 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-23 03:24:53,171 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:24:53,178 INFO L263 TraceCheckSpWp]: Trace formula consists of 736 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-23 03:24:53,182 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:24:53,342 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 03:24:53,342 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:24:53,506 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 03:24:53,506 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1219245378] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:24:53,507 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [875661065] [2021-11-23 03:24:53,533 INFO L159 IcfgInterpreter]: Started Sifa with 59 locations of interest [2021-11-23 03:24:53,533 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 03:24:53,538 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 03:24:53,544 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 03:24:53,545 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 03:24:53,973 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:53,985 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:53,997 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:54,008 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:54,018 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:54,025 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:54,035 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:54,040 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:54,853 INFO L354 Elim1Store]: treesize reduction 1205, result has 8.4 percent of original size [2021-11-23 03:24:54,854 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 12 select indices, 12 select index equivalence classes, 22 disjoint index pairs (out of 66 index pairs), introduced 12 new quantified variables, introduced 60 case distinctions, treesize of input 200 treesize of output 273 [2021-11-23 03:24:55,198 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:55,200 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:55,202 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:55,205 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:55,207 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:55,209 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:55,210 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:55,212 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:55,214 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:55,215 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:55,217 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:55,219 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:55,221 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:55,223 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:55,224 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:55,226 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:55,228 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:55,229 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:55,235 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:55,237 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:55,238 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:55,239 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:55,241 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:55,242 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:55,244 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:55,245 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:55,247 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:55,248 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:55,249 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:55,251 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:55,252 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:55,254 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:55,256 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:55,257 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:55,259 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:55,261 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:55,263 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:55,264 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:55,267 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:55,268 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:55,270 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:55,271 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:55,273 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:55,279 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:55,281 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:55,283 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:55,284 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:55,286 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:55,287 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:55,289 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:55,290 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:55,291 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:55,292 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:55,293 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:55,295 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:55,296 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:55,298 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:55,299 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:55,302 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:55,304 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:55,305 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:55,307 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:55,309 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:55,311 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:55,313 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:55,314 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:55,316 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:55,318 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:55,320 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:55,321 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:55,323 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:55,325 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:55,327 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:55,329 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:55,331 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:55,333 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:55,335 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:55,337 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:55,338 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:55,340 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:55,342 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:55,344 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:55,346 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:55,347 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:55,349 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:55,351 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:55,353 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:55,354 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:55,356 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:55,358 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:55,360 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:55,361 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:55,363 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:55,365 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:55,367 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:55,369 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:55,370 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:55,372 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:55,374 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:55,376 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:55,377 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:55,379 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:55,381 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:55,382 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:55,384 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:55,386 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:55,387 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:55,389 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:55,391 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:55,391 INFO L244 Elim1Store]: Index analysis took 194 ms [2021-11-23 03:24:55,406 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 144 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 2175 treesize of output 2037 [2021-11-23 03:24:55,950 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:55,951 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:55,953 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:55,954 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:55,956 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:55,957 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:55,959 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:55,960 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:55,962 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:55,963 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:55,965 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:55,967 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:55,968 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:55,970 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:55,971 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:55,973 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:55,974 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:55,978 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:55,979 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:55,981 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:55,983 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:55,985 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:55,986 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:55,988 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:55,990 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:55,991 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:55,993 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:55,995 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:55,997 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:55,998 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:56,000 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:56,002 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:56,004 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:56,005 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:56,007 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:56,009 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:56,011 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:56,013 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:56,014 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:56,016 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:56,018 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:56,020 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:56,021 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:56,023 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:56,025 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:56,026 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:56,028 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:56,030 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:56,032 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:56,033 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:56,035 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:56,037 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:56,039 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:56,040 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:56,042 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:56,044 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:56,046 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:56,048 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:56,050 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:56,051 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:56,053 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:56,055 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:56,057 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:56,059 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:56,061 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:56,062 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:56,064 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:56,066 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:56,068 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:56,070 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:56,071 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:56,073 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:56,075 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:56,076 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:56,078 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:56,080 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:56,081 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:56,083 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:56,085 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:56,087 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:56,088 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:56,090 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:56,092 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:56,094 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:56,096 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:56,098 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:56,099 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:56,101 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:56,103 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:56,105 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:56,107 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:56,108 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:56,110 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:56,112 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:56,114 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:56,115 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:56,117 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:56,119 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:56,121 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:56,123 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:56,124 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:56,126 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:56,128 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:56,130 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:56,132 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:56,134 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:56,136 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:56,137 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:56,139 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:56,141 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:56,143 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:56,145 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:56,162 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:56,163 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:56,165 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:56,167 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:56,169 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:56,171 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:56,173 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:56,174 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:56,176 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:56,178 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:56,180 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:56,182 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:56,183 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:56,185 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:56,187 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:56,189 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:56,191 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:56,193 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:56,195 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:56,196 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:56,198 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:56,200 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:56,202 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:56,204 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:56,206 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:56,208 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:56,210 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:56,212 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:56,214 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:56,216 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:56,218 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:56,220 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:56,222 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:56,224 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:56,226 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:56,228 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:56,230 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:56,233 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:56,235 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:56,237 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:56,238 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:56,240 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:56,242 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:56,244 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:24:56,245 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 03:24:56,247 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 03:24:56,248 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 03:24:56,249 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 03:24:56,249 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 03:24:56,250 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 03:24:56,251 INFO L244 Elim1Store]: Index analysis took 303 ms [2021-11-23 03:27:48,827 WARN L227 SmtUtils]: Spent 2.88m on a formula simplification. DAG size of input: 346 DAG size of output: 144 (called from [L 351] de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.arrays.Elim1Store.elim1) [2021-11-23 03:27:48,828 INFO L354 Elim1Store]: treesize reduction 5417, result has 4.2 percent of original size [2021-11-23 03:27:48,830 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 0 select indices, 0 select index equivalence classes, 181 disjoint index pairs (out of 0 index pairs), introduced 2 new quantified variables, introduced 25 case distinctions, treesize of input 4617 treesize of output 1700 [2021-11-23 03:27:48,966 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 27 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 1661 treesize of output 1604 [2021-11-23 03:27:49,749 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:27:49,751 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:27:49,753 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:27:49,755 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:27:49,757 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:27:49,759 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:27:49,761 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:27:49,763 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:27:49,765 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:27:49,767 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:27:49,769 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:27:49,771 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:27:49,773 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:27:49,775 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:27:49,777 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:27:49,779 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:27:49,780 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:27:49,782 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:27:49,784 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:27:49,786 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:27:49,787 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:27:49,789 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:27:49,791 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:27:49,792 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:27:49,794 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:27:49,796 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:27:49,798 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:27:49,799 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:27:49,801 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:27:49,803 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:27:49,805 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:27:49,806 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:27:49,808 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:27:49,810 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:27:49,812 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:27:49,813 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:27:49,815 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:27:49,817 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:27:49,819 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:27:49,820 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:27:49,822 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:27:49,824 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:27:49,826 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:27:49,827 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:27:49,829 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:27:49,831 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:27:49,833 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:27:49,835 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:27:49,836 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:27:49,838 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:27:49,840 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:27:49,841 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:27:49,843 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:27:49,845 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:27:49,847 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:27:49,848 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:27:49,850 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:27:49,852 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:27:49,854 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:27:49,856 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:27:49,857 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:27:49,859 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:27:49,861 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:27:49,863 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:27:49,864 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:27:49,866 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:27:49,868 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:27:49,869 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:27:49,871 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:27:49,873 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:27:49,875 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:27:49,876 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:27:49,878 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:27:49,880 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:27:49,882 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:27:49,883 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:27:49,885 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:27:49,887 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:27:49,889 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:27:49,891 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:27:49,893 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:27:49,895 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:27:49,896 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:27:49,898 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:27:49,900 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:27:49,902 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:27:49,904 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:27:49,905 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:27:49,907 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:27:49,909 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:27:49,911 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:27:49,913 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:27:49,914 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:27:49,916 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:27:49,918 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:27:49,920 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:27:49,921 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:27:49,923 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:27:49,939 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:27:49,941 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:27:49,942 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:27:49,944 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:27:49,946 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:27:49,948 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:27:49,950 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:27:49,952 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:27:49,953 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:27:49,955 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:27:49,957 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:27:49,959 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:27:49,961 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:27:49,962 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:27:49,964 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:27:49,966 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:27:49,968 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:27:49,969 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 03:27:49,971 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:27:49,973 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:27:49,974 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:27:49,976 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:27:49,978 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:27:49,980 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:27:49,981 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:27:49,983 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:27:49,985 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:27:49,986 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:27:49,988 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:27:49,990 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:27:49,991 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:27:49,993 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:27:49,995 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:27:49,996 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:27:49,998 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:27:49,999 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:27:50,001 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:27:50,003 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:27:50,004 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:27:50,006 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:27:50,007 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:27:50,009 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:27:50,011 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:27:50,013 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:27:50,014 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:27:50,015 INFO L244 Elim1Store]: Index analysis took 268 ms [2021-11-23 03:27:55,417 WARN L227 SmtUtils]: Spent 5.38s on a formula simplification. DAG size of input: 333 DAG size of output: 147 (called from [L 351] de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.arrays.Elim1Store.elim1) [2021-11-23 03:27:55,419 INFO L354 Elim1Store]: treesize reduction 4418, result has 6.9 percent of original size [2021-11-23 03:27:55,420 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 2 select indices, 2 select index equivalence classes, 176 disjoint index pairs (out of 1 index pairs), introduced 4 new quantified variables, introduced 24 case distinctions, treesize of input 2580 treesize of output 1582 [2021-11-23 03:27:55,537 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 5 select indices, 5 select index equivalence classes, 34 disjoint index pairs (out of 10 index pairs), introduced 4 new quantified variables, introduced 0 case distinctions, treesize of input 1552 treesize of output 1506 [2021-11-23 03:27:55,580 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:27:55,582 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:27:55,584 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:27:55,585 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:27:55,587 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:27:55,589 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:27:55,591 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:27:55,607 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 03:27:55,610 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 1599 treesize of output 1555 [2021-11-23 03:27:55,731 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 5 select indices, 5 select index equivalence classes, 34 disjoint index pairs (out of 10 index pairs), introduced 4 new quantified variables, introduced 0 case distinctions, treesize of input 1552 treesize of output 1500 [2021-11-23 03:27:55,777 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:27:55,779 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:27:55,780 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:27:55,782 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:27:55,783 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:27:55,785 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:27:55,787 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:27:55,790 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 03:27:55,805 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 03:27:55,807 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 1180 treesize of output 1140 [2021-11-23 03:27:56,365 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-23 03:27:56,546 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable26 [2021-11-23 03:27:56,547 FATAL L? ?]: The Plugin de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction has thrown an exception: java.lang.AssertionError: Some non-self update cases but no top-level DER relation at de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.arrays.DerPreprocessor.(DerPreprocessor.java:146) at de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.arrays.ElimStorePlain.applyComplexEliminationRules(ElimStorePlain.java:340) at de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.DualJunctionSaa.tryToEliminate(DualJunctionSaa.java:140) at de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.DualJunctionSaa.tryToEliminateOne(DualJunctionSaa.java:115) at de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.DualJunctionSaa.tryExhaustivelyToEliminate(DualJunctionSaa.java:93) at de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.DualJunctionSaa.tryToEliminate(DualJunctionSaa.java:88) at de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher.tryToEliminateOne(QuantifierPusher.java:903) at de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher.applyNewEliminationTechniquesExhaustively(QuantifierPusher.java:865) at de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher.applyDualJunctionEliminationTechniques(QuantifierPusher.java:783) at de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher.tryToPushOverDualFiniteConnective2(QuantifierPusher.java:425) at de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher.tryToPushOverDualFiniteConnective(QuantifierPusher.java:355) at de.uni_freiburg.informatik.ultimate.lib.smtlibutils.QuantifierPushTermWalker.convert(QuantifierPushTermWalker.java:162) at de.uni_freiburg.informatik.ultimate.lib.smtlibutils.QuantifierPushTermWalker.convert(QuantifierPushTermWalker.java:1) at de.uni_freiburg.informatik.ultimate.lib.smtlibutils.TermContextTransformationEngine$ApplicationTermTask.doStep(TermContextTransformationEngine.java:169) at de.uni_freiburg.informatik.ultimate.lib.smtlibutils.TermContextTransformationEngine.transform(TermContextTransformationEngine.java:77) at de.uni_freiburg.informatik.ultimate.lib.smtlibutils.TermContextTransformationEngine.transform(TermContextTransformationEngine.java:61) at de.uni_freiburg.informatik.ultimate.lib.smtlibutils.QuantifierPushTermWalker.eliminate(QuantifierPushTermWalker.java:243) at de.uni_freiburg.informatik.ultimate.lib.smtlibutils.QuantifierPushTermWalker.eliminate(QuantifierPushTermWalker.java:233) at de.uni_freiburg.informatik.ultimate.lib.sifa.SymbolicTools$EliminatingTermDomainOperationProvider.newQuantifier(SymbolicTools.java:285) at de.uni_freiburg.informatik.ultimate.lib.sifa.SymbolicTools$EliminatingTermDomainOperationProvider.projectExistentially(SymbolicTools.java:267) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.TermDomainOperationProvider.projectExistentially(TermDomainOperationProvider.java:1) at de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateTransformer.strongestPostcondition(PredicateTransformer.java:131) at de.uni_freiburg.informatik.ultimate.lib.sifa.SymbolicTools.post(SymbolicTools.java:119) at de.uni_freiburg.informatik.ultimate.lib.sifa.DagInterpreter.ipretInternal(DagInterpreter.java:227) at de.uni_freiburg.informatik.ultimate.lib.sifa.DagInterpreter.ipretTransAndStoreLoiPred(DagInterpreter.java:209) at de.uni_freiburg.informatik.ultimate.lib.sifa.DagInterpreter.ipretTrans(DagInterpreter.java:187) at de.uni_freiburg.informatik.ultimate.lib.sifa.DagInterpreter.ipretNode(DagInterpreter.java:165) at de.uni_freiburg.informatik.ultimate.lib.sifa.DagInterpreter.interpret(DagInterpreter.java:123) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.interpretLoisInProcedure(IcfgInterpreter.java:136) at de.uni_freiburg.informatik.ultimate.lib.sifa.IcfgInterpreter.interpret(IcfgInterpreter.java:127) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.SifaRunner.(SifaRunner.java:102) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleSifa.construct(IpTcStrategyModuleSifa.java:67) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getOrConstruct(IpTcStrategyModuleBase.java:100) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.IpTcStrategyModuleBase.getInterpolantComputationStatus(IpTcStrategyModuleBase.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.tryExecuteInterpolantGenerator(AutomatonFreeRefinementEngine.java:268) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.generateProof(AutomatonFreeRefinementEngine.java:150) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.executeStrategy(AutomatonFreeRefinementEngine.java:140) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.AutomatonFreeRefinementEngine.(AutomatonFreeRefinementEngine.java:88) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.tracehandling.TraceAbstractionRefinementEngine.(TraceAbstractionRefinementEngine.java:76) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.BasicCegarLoop.isCounterexampleFeasible(BasicCegarLoop.java:610) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.iterate(AbstractCegarLoop.java:413) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.startCegar(AbstractCegarLoop.java:348) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.AbstractCegarLoop.runCegar(AbstractCegarLoop.java:330) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.CegarLoopUtils.getCegarLoopResult(CegarLoopUtils.java:56) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.executeCegarLoop(TraceAbstractionStarter.java:393) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseProgram(TraceAbstractionStarter.java:303) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.analyseSequentialProgram(TraceAbstractionStarter.java:263) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.runCegarLoops(TraceAbstractionStarter.java:176) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionStarter.(TraceAbstractionStarter.java:155) at de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver.finish(TraceAbstractionObserver.java:123) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runObserver(PluginConnector.java:168) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.runTool(PluginConnector.java:151) at de.uni_freiburg.informatik.ultimate.core.coreplugin.PluginConnector.run(PluginConnector.java:128) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.executePluginConnector(ToolchainWalker.java:232) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.processPlugin(ToolchainWalker.java:226) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walkUnprotected(ToolchainWalker.java:142) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainWalker.walk(ToolchainWalker.java:104) at de.uni_freiburg.informatik.ultimate.core.coreplugin.ToolchainManager$Toolchain.processToolchain(ToolchainManager.java:320) at de.uni_freiburg.informatik.ultimate.core.coreplugin.toolchain.DefaultToolchainJob.run(DefaultToolchainJob.java:145) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:63) [2021-11-23 03:27:56,564 INFO L158 Benchmark]: Toolchain (without parser) took 312718.52ms. Allocated memory was 98.6MB in the beginning and 197.1MB in the end (delta: 98.6MB). Free memory was 60.1MB in the beginning and 82.4MB in the end (delta: -22.3MB). Peak memory consumption was 124.3MB. Max. memory is 16.1GB. [2021-11-23 03:27:56,565 INFO L158 Benchmark]: CDTParser took 0.28ms. Allocated memory is still 75.5MB. Free memory was 49.3MB in the beginning and 49.2MB in the end (delta: 29.1kB). There was no memory consumed. Max. memory is 16.1GB. [2021-11-23 03:27:56,565 INFO L158 Benchmark]: CACSL2BoogieTranslator took 1186.12ms. Allocated memory is still 98.6MB. Free memory was 59.9MB in the beginning and 53.3MB in the end (delta: 6.6MB). Peak memory consumption was 19.9MB. Max. memory is 16.1GB. [2021-11-23 03:27:56,565 INFO L158 Benchmark]: Boogie Procedure Inliner took 159.16ms. Allocated memory is still 98.6MB. Free memory was 53.3MB in the beginning and 46.2MB in the end (delta: 7.1MB). Peak memory consumption was 6.3MB. Max. memory is 16.1GB. [2021-11-23 03:27:56,565 INFO L158 Benchmark]: Boogie Preprocessor took 157.35ms. Allocated memory was 98.6MB in the beginning and 119.5MB in the end (delta: 21.0MB). Free memory was 46.2MB in the beginning and 84.0MB in the end (delta: -37.8MB). Peak memory consumption was 17.1MB. Max. memory is 16.1GB. [2021-11-23 03:27:56,566 INFO L158 Benchmark]: RCFGBuilder took 3700.64ms. Allocated memory was 119.5MB in the beginning and 155.2MB in the end (delta: 35.7MB). Free memory was 84.0MB in the beginning and 109.4MB in the end (delta: -25.3MB). Peak memory consumption was 65.0MB. Max. memory is 16.1GB. [2021-11-23 03:27:56,566 INFO L158 Benchmark]: TraceAbstraction took 307506.80ms. Allocated memory was 155.2MB in the beginning and 197.1MB in the end (delta: 41.9MB). Free memory was 109.4MB in the beginning and 82.4MB in the end (delta: 27.0MB). Peak memory consumption was 116.6MB. Max. memory is 16.1GB. [2021-11-23 03:27:56,568 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.28ms. Allocated memory is still 75.5MB. Free memory was 49.3MB in the beginning and 49.2MB in the end (delta: 29.1kB). There was no memory consumed. Max. memory is 16.1GB. * CACSL2BoogieTranslator took 1186.12ms. Allocated memory is still 98.6MB. Free memory was 59.9MB in the beginning and 53.3MB in the end (delta: 6.6MB). Peak memory consumption was 19.9MB. Max. memory is 16.1GB. * Boogie Procedure Inliner took 159.16ms. Allocated memory is still 98.6MB. Free memory was 53.3MB in the beginning and 46.2MB in the end (delta: 7.1MB). Peak memory consumption was 6.3MB. Max. memory is 16.1GB. * Boogie Preprocessor took 157.35ms. Allocated memory was 98.6MB in the beginning and 119.5MB in the end (delta: 21.0MB). Free memory was 46.2MB in the beginning and 84.0MB in the end (delta: -37.8MB). Peak memory consumption was 17.1MB. Max. memory is 16.1GB. * RCFGBuilder took 3700.64ms. Allocated memory was 119.5MB in the beginning and 155.2MB in the end (delta: 35.7MB). Free memory was 84.0MB in the beginning and 109.4MB in the end (delta: -25.3MB). Peak memory consumption was 65.0MB. Max. memory is 16.1GB. * TraceAbstraction took 307506.80ms. Allocated memory was 155.2MB in the beginning and 197.1MB in the end (delta: 41.9MB). Free memory was 109.4MB in the beginning and 82.4MB in the end (delta: 27.0MB). Peak memory consumption was 116.6MB. Max. memory is 16.1GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - ExceptionOrErrorResult: AssertionError: Some non-self update cases but no top-level DER relation de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: AssertionError: Some non-self update cases but no top-level DER relation: de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.arrays.DerPreprocessor.(DerPreprocessor.java:146) RESULT: Ultimate could not prove your program: Toolchain returned no result. [2021-11-23 03:27:56,646 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Forceful destruction successful, exit code 0 Received shutdown request... --- End real Ultimate output --- Execution finished normally Using bit-precise analysis Retrying with bit-precise analysis ### Bit-precise run ### Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/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_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/config/TaipanReach.xml -i ../../sv-benchmarks/c/ntdrivers/kbfiltr.i.cil-2.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/config/svcomp-Reach-32bit-Taipan_Bitvector.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/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 791fd4c1f54f973c646b3f11f7eb2f654eca269cacf7e504443ee0d13fbe9694 --- Real Ultimate output --- This is Ultimate 0.2.1-dev-aef121e [2021-11-23 03:27:59,106 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-23 03:27:59,110 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-23 03:27:59,177 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-23 03:27:59,177 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-23 03:27:59,182 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-23 03:27:59,186 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-23 03:27:59,191 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-23 03:27:59,195 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-23 03:27:59,203 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-23 03:27:59,204 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-23 03:27:59,206 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-23 03:27:59,207 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-23 03:27:59,210 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-23 03:27:59,213 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-23 03:27:59,216 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-23 03:27:59,218 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-23 03:27:59,221 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-23 03:27:59,226 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-23 03:27:59,234 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-23 03:27:59,237 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-23 03:27:59,239 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-23 03:27:59,241 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-23 03:27:59,244 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-23 03:27:59,254 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-23 03:27:59,254 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-23 03:27:59,255 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-23 03:27:59,257 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-23 03:27:59,258 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-23 03:27:59,260 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-23 03:27:59,260 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-23 03:27:59,261 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-23 03:27:59,264 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-23 03:27:59,265 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-23 03:27:59,267 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-23 03:27:59,267 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-23 03:27:59,269 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-23 03:27:59,269 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-23 03:27:59,269 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-23 03:27:59,272 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-23 03:27:59,273 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-23 03:27:59,274 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/config/svcomp-Reach-32bit-Taipan_Bitvector.epf [2021-11-23 03:27:59,328 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-23 03:27:59,328 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-23 03:27:59,329 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-23 03:27:59,330 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-23 03:27:59,331 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-23 03:27:59,331 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-23 03:27:59,331 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-23 03:27:59,332 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-23 03:27:59,332 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-23 03:27:59,332 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-23 03:27:59,334 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-23 03:27:59,334 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-23 03:27:59,336 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-23 03:27:59,336 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-23 03:27:59,336 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-23 03:27:59,337 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-23 03:27:59,337 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-23 03:27:59,337 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-23 03:27:59,338 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-23 03:27:59,338 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-11-23 03:27:59,338 INFO L138 SettingsManager]: * Use bitvectors instead of ints=true [2021-11-23 03:27:59,339 INFO L138 SettingsManager]: * Memory model=HoenickeLindenmann_4ByteResolution [2021-11-23 03:27:59,339 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-23 03:27:59,339 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-23 03:27:59,339 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-23 03:27:59,340 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-23 03:27:59,340 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-23 03:27:59,340 INFO L138 SettingsManager]: * Size of a code block=SequenceOfStatements [2021-11-23 03:27:59,341 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-23 03:27:59,341 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 03:27:59,341 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-23 03:27:59,342 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-23 03:27:59,342 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-23 03:27:59,343 INFO L138 SettingsManager]: * Trace refinement strategy=WALRUS [2021-11-23 03:27:59,343 INFO L138 SettingsManager]: * Command for external solver=cvc4 --incremental --print-success --lang smt [2021-11-23 03:27:59,343 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-23 03:27:59,344 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-23 03:27:59,344 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-23 03:27:59,345 INFO L138 SettingsManager]: * Logic for external solver=AUFBV 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_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 791fd4c1f54f973c646b3f11f7eb2f654eca269cacf7e504443ee0d13fbe9694 [2021-11-23 03:27:59,787 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-23 03:27:59,819 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-23 03:27:59,822 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-23 03:27:59,823 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-23 03:27:59,824 INFO L275 PluginConnector]: CDTParser initialized [2021-11-23 03:27:59,826 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/../../sv-benchmarks/c/ntdrivers/kbfiltr.i.cil-2.c [2021-11-23 03:27:59,903 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/data/dfb31e524/3d11893c52cc4452b2fd3d228a125990/FLAGc456033c8 [2021-11-23 03:28:00,703 INFO L306 CDTParser]: Found 1 translation units. [2021-11-23 03:28:00,704 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/sv-benchmarks/c/ntdrivers/kbfiltr.i.cil-2.c [2021-11-23 03:28:00,752 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/data/dfb31e524/3d11893c52cc4452b2fd3d228a125990/FLAGc456033c8 [2021-11-23 03:28:00,800 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/data/dfb31e524/3d11893c52cc4452b2fd3d228a125990 [2021-11-23 03:28:00,804 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-23 03:28:00,806 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-23 03:28:00,810 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-23 03:28:00,810 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-23 03:28:00,814 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-23 03:28:00,815 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 03:28:00" (1/1) ... [2021-11-23 03:28:00,817 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@692b80db and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:28:00, skipping insertion in model container [2021-11-23 03:28:00,817 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 03:28:00" (1/1) ... [2021-11-23 03:28:00,824 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-23 03:28:00,939 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-23 03:28:01,546 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_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/sv-benchmarks/c/ntdrivers/kbfiltr.i.cil-2.c[62209,62222] [2021-11-23 03:28:01,725 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 03:28:01,742 INFO L200 MainTranslator]: Restarting translation with changed settings: SettingsChange [mNewPreferredMemoryModel=HoenickeLindenmann_1ByteResolution] [2021-11-23 03:28:01,779 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-23 03:28:01,831 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_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/sv-benchmarks/c/ntdrivers/kbfiltr.i.cil-2.c[62209,62222] [2021-11-23 03:28:02,016 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 03:28:02,027 INFO L203 MainTranslator]: Completed pre-run [2021-11-23 03:28:02,106 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_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/sv-benchmarks/c/ntdrivers/kbfiltr.i.cil-2.c[62209,62222] [2021-11-23 03:28:02,299 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 03:28:02,342 INFO L208 MainTranslator]: Completed translation [2021-11-23 03:28:02,343 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:28:02 WrapperNode [2021-11-23 03:28:02,343 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-23 03:28:02,344 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-23 03:28:02,344 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-23 03:28:02,345 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-23 03:28:02,352 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:28:02" (1/1) ... [2021-11-23 03:28:02,424 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:28:02" (1/1) ... [2021-11-23 03:28:02,486 INFO L137 Inliner]: procedures = 113, calls = 328, calls flagged for inlining = 23, calls inlined = 20, statements flattened = 1052 [2021-11-23 03:28:02,487 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-23 03:28:02,488 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-23 03:28:02,488 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-23 03:28:02,488 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-23 03:28:02,526 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:28:02" (1/1) ... [2021-11-23 03:28:02,526 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:28:02" (1/1) ... [2021-11-23 03:28:02,537 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:28:02" (1/1) ... [2021-11-23 03:28:02,537 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:28:02" (1/1) ... [2021-11-23 03:28:02,585 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:28:02" (1/1) ... [2021-11-23 03:28:02,595 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:28:02" (1/1) ... [2021-11-23 03:28:02,603 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:28:02" (1/1) ... [2021-11-23 03:28:02,615 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-23 03:28:02,616 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-23 03:28:02,616 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-23 03:28:02,617 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-23 03:28:02,617 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:28:02" (1/1) ... [2021-11-23 03:28:02,624 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 03:28:02,638 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:28:02,658 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-23 03:28:02,660 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-23 03:28:02,703 INFO L130 BoogieDeclarations]: Found specification of procedure KbFilter_Complete [2021-11-23 03:28:02,704 INFO L138 BoogieDeclarations]: Found implementation of procedure KbFilter_Complete [2021-11-23 03:28:02,704 INFO L130 BoogieDeclarations]: Found specification of procedure read~intINTTYPE1 [2021-11-23 03:28:02,704 INFO L130 BoogieDeclarations]: Found specification of procedure read~intINTTYPE4 [2021-11-23 03:28:02,704 INFO L130 BoogieDeclarations]: Found specification of procedure read~unchecked~$Pointer$ [2021-11-23 03:28:02,704 INFO L130 BoogieDeclarations]: Found specification of procedure write~unchecked~$Pointer$ [2021-11-23 03:28:02,705 INFO L130 BoogieDeclarations]: Found specification of procedure errorFn [2021-11-23 03:28:02,705 INFO L138 BoogieDeclarations]: Found implementation of procedure errorFn [2021-11-23 03:28:02,705 INFO L130 BoogieDeclarations]: Found specification of procedure write~unchecked~intINTTYPE4 [2021-11-23 03:28:02,705 INFO L130 BoogieDeclarations]: Found specification of procedure IofCompleteRequest [2021-11-23 03:28:02,705 INFO L138 BoogieDeclarations]: Found implementation of procedure IofCompleteRequest [2021-11-23 03:28:02,705 INFO L130 BoogieDeclarations]: Found specification of procedure write~unchecked~intINTTYPE1 [2021-11-23 03:28:02,706 INFO L130 BoogieDeclarations]: Found specification of procedure IofCallDriver [2021-11-23 03:28:02,706 INFO L138 BoogieDeclarations]: Found implementation of procedure IofCallDriver [2021-11-23 03:28:02,706 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2021-11-23 03:28:02,706 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-23 03:28:02,706 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-11-23 03:28:02,706 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2021-11-23 03:28:02,707 INFO L130 BoogieDeclarations]: Found specification of procedure stubMoreProcessingRequired [2021-11-23 03:28:02,707 INFO L138 BoogieDeclarations]: Found implementation of procedure stubMoreProcessingRequired [2021-11-23 03:28:02,707 INFO L130 BoogieDeclarations]: Found specification of procedure KbFilter_CreateClose [2021-11-23 03:28:02,707 INFO L138 BoogieDeclarations]: Found implementation of procedure KbFilter_CreateClose [2021-11-23 03:28:02,707 INFO L130 BoogieDeclarations]: Found specification of procedure read~unchecked~intINTTYPE4 [2021-11-23 03:28:02,707 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2021-11-23 03:28:02,708 INFO L130 BoogieDeclarations]: Found specification of procedure write~intINTTYPE1 [2021-11-23 03:28:02,708 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-11-23 03:28:02,708 INFO L130 BoogieDeclarations]: Found specification of procedure write~intINTTYPE4 [2021-11-23 03:28:02,709 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~intINTTYPE1 [2021-11-23 03:28:02,709 INFO L130 BoogieDeclarations]: Found specification of procedure read~unchecked~intINTTYPE1 [2021-11-23 03:28:02,709 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-23 03:28:02,709 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-23 03:28:02,710 INFO L130 BoogieDeclarations]: Found specification of procedure KbFilter_DispatchPassThrough [2021-11-23 03:28:02,710 INFO L138 BoogieDeclarations]: Found implementation of procedure KbFilter_DispatchPassThrough [2021-11-23 03:28:03,125 INFO L236 CfgBuilder]: Building ICFG [2021-11-23 03:28:03,127 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-23 03:28:03,386 WARN L815 $ProcedureCfgBuilder]: Label in the middle of a codeblock. [2021-11-23 03:28:03,444 INFO L768 $ProcedureCfgBuilder]: dead code at ProgramPoint $Ultimate##12: assume !false; [2021-11-23 03:28:03,444 INFO L768 $ProcedureCfgBuilder]: dead code at ProgramPoint $Ultimate##11: assume false; [2021-11-23 03:28:03,446 WARN L815 $ProcedureCfgBuilder]: Label in the middle of a codeblock. [2021-11-23 03:28:03,447 WARN L815 $ProcedureCfgBuilder]: Label in the middle of a codeblock. [2021-11-23 03:28:03,449 WARN L815 $ProcedureCfgBuilder]: Label in the middle of a codeblock. [2021-11-23 03:28:03,466 WARN L815 $ProcedureCfgBuilder]: Label in the middle of a codeblock. [2021-11-23 03:28:03,468 WARN L815 $ProcedureCfgBuilder]: Label in the middle of a codeblock. [2021-11-23 03:28:03,472 WARN L815 $ProcedureCfgBuilder]: Label in the middle of a codeblock. [2021-11-23 03:28:03,474 WARN L815 $ProcedureCfgBuilder]: Label in the middle of a codeblock. [2021-11-23 03:28:11,176 INFO L768 $ProcedureCfgBuilder]: dead code at ProgramPoint $Ultimate##83: assume false; [2021-11-23 03:28:11,176 INFO L768 $ProcedureCfgBuilder]: dead code at ProgramPoint $Ultimate##84: assume !false; [2021-11-23 03:28:11,176 INFO L768 $ProcedureCfgBuilder]: dead code at ProgramPoint $Ultimate##36: assume !false; [2021-11-23 03:28:11,176 INFO L768 $ProcedureCfgBuilder]: dead code at ProgramPoint $Ultimate##35: assume false; [2021-11-23 03:28:11,177 INFO L768 $ProcedureCfgBuilder]: dead code at ProgramPoint $Ultimate##139: assume false; [2021-11-23 03:28:11,177 INFO L768 $ProcedureCfgBuilder]: dead code at ProgramPoint $Ultimate##140: assume !false; [2021-11-23 03:28:11,177 INFO L768 $ProcedureCfgBuilder]: dead code at ProgramPoint $Ultimate##20: assume !false; [2021-11-23 03:28:11,177 INFO L768 $ProcedureCfgBuilder]: dead code at ProgramPoint $Ultimate##19: assume false; [2021-11-23 03:28:11,177 INFO L768 $ProcedureCfgBuilder]: dead code at ProgramPoint $Ultimate##10: assume false; [2021-11-23 03:28:11,177 INFO L768 $ProcedureCfgBuilder]: dead code at ProgramPoint $Ultimate##157: assume !false; [2021-11-23 03:28:11,178 INFO L768 $ProcedureCfgBuilder]: dead code at ProgramPoint $Ultimate##11: assume !false; [2021-11-23 03:28:11,178 INFO L768 $ProcedureCfgBuilder]: dead code at ProgramPoint $Ultimate##156: assume false; [2021-11-23 03:28:11,178 INFO L768 $ProcedureCfgBuilder]: dead code at ProgramPoint $Ultimate##114: assume !false; [2021-11-23 03:28:11,178 INFO L768 $ProcedureCfgBuilder]: dead code at ProgramPoint $Ultimate##113: assume false; [2021-11-23 03:28:11,239 INFO L277 CfgBuilder]: Performing block encoding [2021-11-23 03:28:11,260 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-23 03:28:11,260 INFO L301 CfgBuilder]: Removed 0 assume(true) statements. [2021-11-23 03:28:11,263 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 03:28:11 BoogieIcfgContainer [2021-11-23 03:28:11,264 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-23 03:28:11,266 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-23 03:28:11,266 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-23 03:28:11,270 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-23 03:28:11,271 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.11 03:28:00" (1/3) ... [2021-11-23 03:28:11,272 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1461412 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 03:28:11, skipping insertion in model container [2021-11-23 03:28:11,272 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:28:02" (2/3) ... [2021-11-23 03:28:11,273 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1461412 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 03:28:11, skipping insertion in model container [2021-11-23 03:28:11,273 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 03:28:11" (3/3) ... [2021-11-23 03:28:11,275 INFO L111 eAbstractionObserver]: Analyzing ICFG kbfiltr.i.cil-2.c [2021-11-23 03:28:11,282 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-23 03:28:11,282 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-23 03:28:11,340 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-23 03:28:11,348 INFO L339 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mLoopAccelerationTechnique=FAST_UPR [2021-11-23 03:28:11,348 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-23 03:28:11,373 INFO L276 IsEmpty]: Start isEmpty. Operand has 239 states, 201 states have (on average 1.572139303482587) internal successors, (316), 219 states have internal predecessors, (316), 29 states have call successors, (29), 7 states have call predecessors, (29), 7 states have return successors, (29), 27 states have call predecessors, (29), 29 states have call successors, (29) [2021-11-23 03:28:11,378 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2021-11-23 03:28:11,379 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:28:11,379 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:28:11,380 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting errorFnErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorFnErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:28:11,385 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:28:11,386 INFO L85 PathProgramCache]: Analyzing trace with hash -660511916, now seen corresponding path program 1 times [2021-11-23 03:28:11,401 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 03:28:11,401 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [641093892] [2021-11-23 03:28:11,402 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:28:11,403 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 03:28:11,403 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/mathsat [2021-11-23 03:28:11,406 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 03:28:11,424 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (2)] Waiting until timeout for monitored process [2021-11-23 03:28:11,707 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:28:11,723 INFO L263 TraceCheckSpWp]: Trace formula consists of 153 conjuncts, 1 conjunts are in the unsatisfiable core [2021-11-23 03:28:11,727 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:28:11,838 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:28:11,839 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:28:11,930 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:28:11,931 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 03:28:11,931 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [641093892] [2021-11-23 03:28:11,932 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [641093892] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-23 03:28:11,933 INFO L186 FreeRefinementEngine]: Found 2 perfect and 0 imperfect interpolant sequences. [2021-11-23 03:28:11,933 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2, 2] imperfect sequences [] total 2 [2021-11-23 03:28:11,935 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1006561256] [2021-11-23 03:28:11,936 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-23 03:28:11,941 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2021-11-23 03:28:11,942 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 03:28:11,980 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2021-11-23 03:28:11,984 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-11-23 03:28:11,991 INFO L87 Difference]: Start difference. First operand has 239 states, 201 states have (on average 1.572139303482587) internal successors, (316), 219 states have internal predecessors, (316), 29 states have call successors, (29), 7 states have call predecessors, (29), 7 states have return successors, (29), 27 states have call predecessors, (29), 29 states have call successors, (29) Second operand has 2 states, 2 states have (on average 7.5) internal successors, (15), 2 states have internal predecessors, (15), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:28:12,099 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:28:12,100 INFO L93 Difference]: Finished difference Result 472 states and 755 transitions. [2021-11-23 03:28:12,101 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2021-11-23 03:28:12,103 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 7.5) internal successors, (15), 2 states have internal predecessors, (15), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 16 [2021-11-23 03:28:12,104 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:28:12,127 INFO L225 Difference]: With dead ends: 472 [2021-11-23 03:28:12,128 INFO L226 Difference]: Without dead ends: 231 [2021-11-23 03:28:12,144 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 30 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-11-23 03:28:12,150 INFO L933 BasicCegarLoop]: 355 mSDtfsCounter, 0 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 0 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 355 SdHoareTripleChecker+Invalid, 0 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 0 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 03:28:12,151 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 355 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 0 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 03:28:12,172 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 231 states. [2021-11-23 03:28:12,231 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 231 to 231. [2021-11-23 03:28:12,234 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 231 states, 195 states have (on average 1.5128205128205128) internal successors, (295), 211 states have internal predecessors, (295), 29 states have call successors, (29), 7 states have call predecessors, (29), 6 states have return successors, (15), 15 states have call predecessors, (15), 15 states have call successors, (15) [2021-11-23 03:28:12,238 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 231 states to 231 states and 339 transitions. [2021-11-23 03:28:12,240 INFO L78 Accepts]: Start accepts. Automaton has 231 states and 339 transitions. Word has length 16 [2021-11-23 03:28:12,241 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:28:12,241 INFO L470 AbstractCegarLoop]: Abstraction has 231 states and 339 transitions. [2021-11-23 03:28:12,241 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 7.5) internal successors, (15), 2 states have internal predecessors, (15), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:28:12,242 INFO L276 IsEmpty]: Start isEmpty. Operand 231 states and 339 transitions. [2021-11-23 03:28:12,243 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2021-11-23 03:28:12,244 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:28:12,244 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:28:12,266 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (2)] Forceful destruction successful, exit code 0 [2021-11-23 03:28:12,459 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 [2021-11-23 03:28:12,460 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting errorFnErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorFnErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:28:12,461 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:28:12,461 INFO L85 PathProgramCache]: Analyzing trace with hash -1247317930, now seen corresponding path program 1 times [2021-11-23 03:28:12,462 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 03:28:12,462 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1054518755] [2021-11-23 03:28:12,463 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:28:12,463 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 03:28:12,463 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/mathsat [2021-11-23 03:28:12,465 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 03:28:12,503 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (3)] Waiting until timeout for monitored process [2021-11-23 03:28:12,791 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:28:12,805 INFO L263 TraceCheckSpWp]: Trace formula consists of 153 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-23 03:28:12,807 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:28:12,984 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:28:12,984 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:28:13,176 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:28:13,176 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 03:28:13,177 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1054518755] [2021-11-23 03:28:13,177 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1054518755] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-23 03:28:13,177 INFO L186 FreeRefinementEngine]: Found 2 perfect and 0 imperfect interpolant sequences. [2021-11-23 03:28:13,177 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [] total 6 [2021-11-23 03:28:13,177 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [842481129] [2021-11-23 03:28:13,177 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-23 03:28:13,179 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 03:28:13,179 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 03:28:13,179 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 03:28:13,180 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-23 03:28:13,180 INFO L87 Difference]: Start difference. First operand 231 states and 339 transitions. Second operand has 6 states, 6 states have (on average 3.0) internal successors, (18), 6 states have internal predecessors, (18), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:28:15,214 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.03s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 03:28:17,223 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 03:28:17,503 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:28:17,503 INFO L93 Difference]: Finished difference Result 248 states and 360 transitions. [2021-11-23 03:28:17,504 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 03:28:17,504 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 3.0) internal successors, (18), 6 states have internal predecessors, (18), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 16 [2021-11-23 03:28:17,504 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:28:17,506 INFO L225 Difference]: With dead ends: 248 [2021-11-23 03:28:17,506 INFO L226 Difference]: Without dead ends: 231 [2021-11-23 03:28:17,507 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 32 GetRequests, 26 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2021-11-23 03:28:17,508 INFO L933 BasicCegarLoop]: 336 mSDtfsCounter, 430 mSDsluCounter, 599 mSDsCounter, 0 mSdLazyCounter, 35 mSolverCounterSat, 24 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 430 SdHoareTripleChecker+Valid, 935 SdHoareTripleChecker+Invalid, 61 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 24 IncrementalHoareTripleChecker+Valid, 35 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.2s IncrementalHoareTripleChecker+Time [2021-11-23 03:28:17,509 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [430 Valid, 935 Invalid, 61 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [24 Valid, 35 Invalid, 2 Unknown, 0 Unchecked, 4.2s Time] [2021-11-23 03:28:17,510 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 231 states. [2021-11-23 03:28:17,527 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 231 to 231. [2021-11-23 03:28:17,528 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 231 states, 195 states have (on average 1.5076923076923077) internal successors, (294), 211 states have internal predecessors, (294), 29 states have call successors, (29), 7 states have call predecessors, (29), 6 states have return successors, (15), 15 states have call predecessors, (15), 15 states have call successors, (15) [2021-11-23 03:28:17,531 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 231 states to 231 states and 338 transitions. [2021-11-23 03:28:17,531 INFO L78 Accepts]: Start accepts. Automaton has 231 states and 338 transitions. Word has length 16 [2021-11-23 03:28:17,531 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:28:17,531 INFO L470 AbstractCegarLoop]: Abstraction has 231 states and 338 transitions. [2021-11-23 03:28:17,532 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 3.0) internal successors, (18), 6 states have internal predecessors, (18), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:28:17,532 INFO L276 IsEmpty]: Start isEmpty. Operand 231 states and 338 transitions. [2021-11-23 03:28:17,533 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-11-23 03:28:17,534 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:28:17,534 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:28:17,554 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (3)] Forceful destruction successful, exit code 0 [2021-11-23 03:28:17,748 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 [2021-11-23 03:28:17,748 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting errorFnErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorFnErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:28:17,749 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:28:17,749 INFO L85 PathProgramCache]: Analyzing trace with hash 1034619550, now seen corresponding path program 1 times [2021-11-23 03:28:17,750 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 03:28:17,751 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1946812039] [2021-11-23 03:28:17,751 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:28:17,751 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 03:28:17,751 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/mathsat [2021-11-23 03:28:17,752 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 03:28:17,790 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (4)] Waiting until timeout for monitored process [2021-11-23 03:28:18,105 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:28:18,126 INFO L263 TraceCheckSpWp]: Trace formula consists of 288 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-23 03:28:18,129 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:28:18,275 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:28:18,275 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:28:18,432 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:28:18,432 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 03:28:18,432 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1946812039] [2021-11-23 03:28:18,433 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1946812039] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-23 03:28:18,433 INFO L186 FreeRefinementEngine]: Found 2 perfect and 0 imperfect interpolant sequences. [2021-11-23 03:28:18,433 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [] total 6 [2021-11-23 03:28:18,433 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [181372848] [2021-11-23 03:28:18,433 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-23 03:28:18,434 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 03:28:18,434 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 03:28:18,435 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 03:28:18,435 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-23 03:28:18,435 INFO L87 Difference]: Start difference. First operand 231 states and 338 transitions. Second operand has 6 states, 6 states have (on average 4.666666666666667) internal successors, (28), 6 states have internal predecessors, (28), 1 states have call successors, (3), 1 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 03:28:20,534 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 03:28:20,552 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:28:20,552 INFO L93 Difference]: Finished difference Result 450 states and 662 transitions. [2021-11-23 03:28:20,566 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 03:28:20,567 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 4.666666666666667) internal successors, (28), 6 states have internal predecessors, (28), 1 states have call successors, (3), 1 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 28 [2021-11-23 03:28:20,567 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:28:20,569 INFO L225 Difference]: With dead ends: 450 [2021-11-23 03:28:20,569 INFO L226 Difference]: Without dead ends: 239 [2021-11-23 03:28:20,570 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 50 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2021-11-23 03:28:20,571 INFO L933 BasicCegarLoop]: 335 mSDtfsCounter, 35 mSDsluCounter, 984 mSDsCounter, 0 mSdLazyCounter, 10 mSolverCounterSat, 4 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 35 SdHoareTripleChecker+Valid, 1319 SdHoareTripleChecker+Invalid, 15 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 10 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.1s IncrementalHoareTripleChecker+Time [2021-11-23 03:28:20,572 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [35 Valid, 1319 Invalid, 15 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 10 Invalid, 1 Unknown, 0 Unchecked, 2.1s Time] [2021-11-23 03:28:20,573 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 239 states. [2021-11-23 03:28:20,589 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 239 to 233. [2021-11-23 03:28:20,590 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 233 states, 197 states have (on average 1.50253807106599) internal successors, (296), 213 states have internal predecessors, (296), 29 states have call successors, (29), 7 states have call predecessors, (29), 6 states have return successors, (15), 15 states have call predecessors, (15), 15 states have call successors, (15) [2021-11-23 03:28:20,592 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 233 states to 233 states and 340 transitions. [2021-11-23 03:28:20,593 INFO L78 Accepts]: Start accepts. Automaton has 233 states and 340 transitions. Word has length 28 [2021-11-23 03:28:20,593 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:28:20,593 INFO L470 AbstractCegarLoop]: Abstraction has 233 states and 340 transitions. [2021-11-23 03:28:20,593 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 4.666666666666667) internal successors, (28), 6 states have internal predecessors, (28), 1 states have call successors, (3), 1 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 03:28:20,594 INFO L276 IsEmpty]: Start isEmpty. Operand 233 states and 340 transitions. [2021-11-23 03:28:20,595 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-11-23 03:28:20,595 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:28:20,595 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:28:20,618 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (4)] Forceful destruction successful, exit code 0 [2021-11-23 03:28:20,814 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 [2021-11-23 03:28:20,815 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting errorFnErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorFnErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:28:20,816 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:28:20,816 INFO L85 PathProgramCache]: Analyzing trace with hash 1646498398, now seen corresponding path program 1 times [2021-11-23 03:28:20,816 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 03:28:20,817 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [241306878] [2021-11-23 03:28:20,817 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:28:20,817 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 03:28:20,817 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/mathsat [2021-11-23 03:28:20,818 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 03:28:20,821 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (5)] Waiting until timeout for monitored process [2021-11-23 03:28:21,126 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:28:21,142 INFO L263 TraceCheckSpWp]: Trace formula consists of 275 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 03:28:21,145 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:28:21,383 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:28:21,384 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:28:21,682 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:28:21,683 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 03:28:21,683 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [241306878] [2021-11-23 03:28:21,683 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [241306878] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-23 03:28:21,684 INFO L186 FreeRefinementEngine]: Found 2 perfect and 0 imperfect interpolant sequences. [2021-11-23 03:28:21,684 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6, 6] imperfect sequences [] total 10 [2021-11-23 03:28:21,684 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2110280225] [2021-11-23 03:28:21,684 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-23 03:28:21,685 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2021-11-23 03:28:21,685 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 03:28:21,686 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2021-11-23 03:28:21,686 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=69, Unknown=0, NotChecked=0, Total=90 [2021-11-23 03:28:21,686 INFO L87 Difference]: Start difference. First operand 233 states and 340 transitions. Second operand has 10 states, 10 states have (on average 3.1) internal successors, (31), 10 states have internal predecessors, (31), 1 states have call successors, (3), 1 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 03:28:23,712 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.02s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 03:28:25,960 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 03:28:27,972 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 03:28:28,096 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:28:28,096 INFO L93 Difference]: Finished difference Result 453 states and 664 transitions. [2021-11-23 03:28:28,097 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-23 03:28:28,097 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 3.1) internal successors, (31), 10 states have internal predecessors, (31), 1 states have call successors, (3), 1 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 28 [2021-11-23 03:28:28,098 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:28:28,100 INFO L225 Difference]: With dead ends: 453 [2021-11-23 03:28:28,100 INFO L226 Difference]: Without dead ends: 230 [2021-11-23 03:28:28,102 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 57 GetRequests, 46 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=48, Invalid=108, Unknown=0, NotChecked=0, Total=156 [2021-11-23 03:28:28,103 INFO L933 BasicCegarLoop]: 336 mSDtfsCounter, 14 mSDsluCounter, 1656 mSDsCounter, 0 mSdLazyCounter, 30 mSolverCounterSat, 1 mSolverCounterUnsat, 3 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 6.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 1992 SdHoareTripleChecker+Invalid, 34 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 30 IncrementalHoareTripleChecker+Invalid, 3 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 6.2s IncrementalHoareTripleChecker+Time [2021-11-23 03:28:28,104 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [14 Valid, 1992 Invalid, 34 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 30 Invalid, 3 Unknown, 0 Unchecked, 6.2s Time] [2021-11-23 03:28:28,105 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 230 states. [2021-11-23 03:28:28,119 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 230 to 230. [2021-11-23 03:28:28,120 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 230 states, 194 states have (on average 1.5) internal successors, (291), 210 states have internal predecessors, (291), 29 states have call successors, (29), 7 states have call predecessors, (29), 6 states have return successors, (15), 15 states have call predecessors, (15), 15 states have call successors, (15) [2021-11-23 03:28:28,122 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 230 states to 230 states and 335 transitions. [2021-11-23 03:28:28,122 INFO L78 Accepts]: Start accepts. Automaton has 230 states and 335 transitions. Word has length 28 [2021-11-23 03:28:28,123 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:28:28,123 INFO L470 AbstractCegarLoop]: Abstraction has 230 states and 335 transitions. [2021-11-23 03:28:28,123 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 3.1) internal successors, (31), 10 states have internal predecessors, (31), 1 states have call successors, (3), 1 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 03:28:28,123 INFO L276 IsEmpty]: Start isEmpty. Operand 230 states and 335 transitions. [2021-11-23 03:28:28,125 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2021-11-23 03:28:28,125 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:28:28,126 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:28:28,151 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (5)] Forceful destruction successful, exit code 0 [2021-11-23 03:28:28,352 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 [2021-11-23 03:28:28,352 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting errorFnErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorFnErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:28:28,352 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:28:28,353 INFO L85 PathProgramCache]: Analyzing trace with hash 806678510, now seen corresponding path program 1 times [2021-11-23 03:28:28,353 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 03:28:28,353 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [626649182] [2021-11-23 03:28:28,354 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:28:28,354 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 03:28:28,354 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/mathsat [2021-11-23 03:28:28,355 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 03:28:28,356 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (6)] Waiting until timeout for monitored process [2021-11-23 03:28:28,668 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:28:28,689 INFO L263 TraceCheckSpWp]: Trace formula consists of 331 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-23 03:28:28,692 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:28:28,830 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:28:28,830 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:28:28,947 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:28:28,948 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 03:28:28,948 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [626649182] [2021-11-23 03:28:28,948 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [626649182] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-23 03:28:28,948 INFO L186 FreeRefinementEngine]: Found 2 perfect and 0 imperfect interpolant sequences. [2021-11-23 03:28:28,949 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [] total 4 [2021-11-23 03:28:28,949 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [574353409] [2021-11-23 03:28:28,949 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-23 03:28:28,949 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 03:28:28,950 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 03:28:28,950 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 03:28:28,950 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-23 03:28:28,950 INFO L87 Difference]: Start difference. First operand 230 states and 335 transitions. Second operand has 4 states, 4 states have (on average 8.0) internal successors, (32), 4 states have internal predecessors, (32), 1 states have call successors, (3), 1 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 03:28:29,002 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:28:29,002 INFO L93 Difference]: Finished difference Result 448 states and 658 transitions. [2021-11-23 03:28:29,003 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 03:28:29,003 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 8.0) internal successors, (32), 4 states have internal predecessors, (32), 1 states have call successors, (3), 1 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 33 [2021-11-23 03:28:29,003 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:28:29,005 INFO L225 Difference]: With dead ends: 448 [2021-11-23 03:28:29,006 INFO L226 Difference]: Without dead ends: 232 [2021-11-23 03:28:29,007 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 64 GetRequests, 62 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-23 03:28:29,008 INFO L933 BasicCegarLoop]: 334 mSDtfsCounter, 0 mSDsluCounter, 664 mSDsCounter, 0 mSdLazyCounter, 5 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 998 SdHoareTripleChecker+Invalid, 6 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 5 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 03:28:29,008 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 998 Invalid, 6 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 5 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 03:28:29,009 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 232 states. [2021-11-23 03:28:29,020 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 232 to 232. [2021-11-23 03:28:29,020 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 232 states, 196 states have (on average 1.4948979591836735) internal successors, (293), 212 states have internal predecessors, (293), 29 states have call successors, (29), 7 states have call predecessors, (29), 6 states have return successors, (15), 15 states have call predecessors, (15), 15 states have call successors, (15) [2021-11-23 03:28:29,022 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 232 states to 232 states and 337 transitions. [2021-11-23 03:28:29,023 INFO L78 Accepts]: Start accepts. Automaton has 232 states and 337 transitions. Word has length 33 [2021-11-23 03:28:29,023 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:28:29,023 INFO L470 AbstractCegarLoop]: Abstraction has 232 states and 337 transitions. [2021-11-23 03:28:29,023 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 8.0) internal successors, (32), 4 states have internal predecessors, (32), 1 states have call successors, (3), 1 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 03:28:29,024 INFO L276 IsEmpty]: Start isEmpty. Operand 232 states and 337 transitions. [2021-11-23 03:28:29,025 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2021-11-23 03:28:29,025 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:28:29,025 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:28:29,042 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (6)] Forceful destruction successful, exit code 0 [2021-11-23 03:28:29,241 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 [2021-11-23 03:28:29,241 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting errorFnErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorFnErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:28:29,242 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:28:29,242 INFO L85 PathProgramCache]: Analyzing trace with hash 868951118, now seen corresponding path program 1 times [2021-11-23 03:28:29,243 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 03:28:29,243 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1498321019] [2021-11-23 03:28:29,243 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:28:29,243 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 03:28:29,243 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/mathsat [2021-11-23 03:28:29,244 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 03:28:29,245 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (7)] Waiting until timeout for monitored process [2021-11-23 03:28:29,606 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:28:29,625 INFO L263 TraceCheckSpWp]: Trace formula consists of 341 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 03:28:29,628 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:28:29,892 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:28:29,893 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:28:30,204 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:28:30,204 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 03:28:30,204 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1498321019] [2021-11-23 03:28:30,205 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1498321019] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:28:30,205 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1358445460] [2021-11-23 03:28:30,205 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:28:30,205 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 03:28:30,206 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/cvc4 [2021-11-23 03:28:30,207 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 03:28:30,210 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (8)] Waiting until timeout for monitored process [2021-11-23 03:28:30,542 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:28:30,550 INFO L263 TraceCheckSpWp]: Trace formula consists of 341 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-23 03:28:30,553 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:28:30,740 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-23 03:28:30,740 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:28:30,879 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-23 03:28:30,880 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1358445460] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-23 03:28:30,880 INFO L186 FreeRefinementEngine]: Found 2 perfect and 2 imperfect interpolant sequences. [2021-11-23 03:28:30,880 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [5, 5] total 9 [2021-11-23 03:28:30,880 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [127107154] [2021-11-23 03:28:30,880 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-23 03:28:30,881 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 03:28:30,881 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 03:28:30,881 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 03:28:30,882 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=48, Unknown=0, NotChecked=0, Total=72 [2021-11-23 03:28:30,882 INFO L87 Difference]: Start difference. First operand 232 states and 337 transitions. Second operand has 3 states, 3 states have (on average 10.333333333333334) internal successors, (31), 3 states have internal predecessors, (31), 2 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 03:28:32,908 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.02s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 03:28:33,270 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:28:33,270 INFO L93 Difference]: Finished difference Result 353 states and 503 transitions. [2021-11-23 03:28:33,271 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 03:28:33,271 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 10.333333333333334) internal successors, (31), 3 states have internal predecessors, (31), 2 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 35 [2021-11-23 03:28:33,271 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:28:33,274 INFO L225 Difference]: With dead ends: 353 [2021-11-23 03:28:33,274 INFO L226 Difference]: Without dead ends: 298 [2021-11-23 03:28:33,275 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 136 GetRequests, 129 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=24, Invalid=48, Unknown=0, NotChecked=0, Total=72 [2021-11-23 03:28:33,275 INFO L933 BasicCegarLoop]: 363 mSDtfsCounter, 241 mSDsluCounter, 111 mSDsCounter, 0 mSdLazyCounter, 70 mSolverCounterSat, 15 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 241 SdHoareTripleChecker+Valid, 474 SdHoareTripleChecker+Invalid, 86 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 15 IncrementalHoareTripleChecker+Valid, 70 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.3s IncrementalHoareTripleChecker+Time [2021-11-23 03:28:33,276 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [241 Valid, 474 Invalid, 86 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [15 Valid, 70 Invalid, 1 Unknown, 0 Unchecked, 2.3s Time] [2021-11-23 03:28:33,277 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 298 states. [2021-11-23 03:28:33,293 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 298 to 282. [2021-11-23 03:28:33,294 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 282 states, 245 states have (on average 1.4244897959183673) internal successors, (349), 248 states have internal predecessors, (349), 26 states have call successors, (26), 11 states have call predecessors, (26), 10 states have return successors, (27), 25 states have call predecessors, (27), 18 states have call successors, (27) [2021-11-23 03:28:33,296 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 282 states to 282 states and 402 transitions. [2021-11-23 03:28:33,296 INFO L78 Accepts]: Start accepts. Automaton has 282 states and 402 transitions. Word has length 35 [2021-11-23 03:28:33,297 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:28:33,297 INFO L470 AbstractCegarLoop]: Abstraction has 282 states and 402 transitions. [2021-11-23 03:28:33,297 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 10.333333333333334) internal successors, (31), 3 states have internal predecessors, (31), 2 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 03:28:33,297 INFO L276 IsEmpty]: Start isEmpty. Operand 282 states and 402 transitions. [2021-11-23 03:28:33,298 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2021-11-23 03:28:33,299 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:28:33,299 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:28:33,319 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (7)] Forceful destruction successful, exit code 0 [2021-11-23 03:28:33,517 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (8)] Ended with exit code 0 [2021-11-23 03:28:33,715 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt [2021-11-23 03:28:33,715 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting errorFnErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorFnErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:28:33,716 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:28:33,716 INFO L85 PathProgramCache]: Analyzing trace with hash -350402367, now seen corresponding path program 1 times [2021-11-23 03:28:33,716 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 03:28:33,716 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [407350321] [2021-11-23 03:28:33,717 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:28:33,717 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 03:28:33,717 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/mathsat [2021-11-23 03:28:33,718 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 03:28:33,719 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (9)] Waiting until timeout for monitored process [2021-11-23 03:28:34,010 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:28:34,029 INFO L263 TraceCheckSpWp]: Trace formula consists of 326 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 03:28:34,032 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:28:34,299 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:28:34,299 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:28:34,563 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:28:34,564 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 03:28:34,564 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [407350321] [2021-11-23 03:28:34,564 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [407350321] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:28:34,564 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1205046723] [2021-11-23 03:28:34,564 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:28:34,565 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 03:28:34,565 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/cvc4 [2021-11-23 03:28:34,576 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 03:28:34,592 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (10)] Waiting until timeout for monitored process [2021-11-23 03:28:34,885 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:28:34,890 INFO L263 TraceCheckSpWp]: Trace formula consists of 326 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 03:28:34,892 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:28:35,074 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-23 03:28:35,074 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:28:35,210 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-23 03:28:35,211 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1205046723] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-23 03:28:35,211 INFO L186 FreeRefinementEngine]: Found 2 perfect and 2 imperfect interpolant sequences. [2021-11-23 03:28:35,211 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [5, 5] total 9 [2021-11-23 03:28:35,211 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [954988034] [2021-11-23 03:28:35,212 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-23 03:28:35,212 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 03:28:35,212 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 03:28:35,213 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 03:28:35,213 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=48, Unknown=0, NotChecked=0, Total=72 [2021-11-23 03:28:35,213 INFO L87 Difference]: Start difference. First operand 282 states and 402 transitions. Second operand has 3 states, 3 states have (on average 11.666666666666666) internal successors, (35), 3 states have internal predecessors, (35), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:28:35,279 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:28:35,280 INFO L93 Difference]: Finished difference Result 438 states and 610 transitions. [2021-11-23 03:28:35,280 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 03:28:35,280 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 11.666666666666666) internal successors, (35), 3 states have internal predecessors, (35), 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 37 [2021-11-23 03:28:35,281 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:28:35,283 INFO L225 Difference]: With dead ends: 438 [2021-11-23 03:28:35,284 INFO L226 Difference]: Without dead ends: 339 [2021-11-23 03:28:35,284 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 144 GetRequests, 137 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=24, Invalid=48, Unknown=0, NotChecked=0, Total=72 [2021-11-23 03:28:35,285 INFO L933 BasicCegarLoop]: 335 mSDtfsCounter, 278 mSDsluCounter, 88 mSDsCounter, 0 mSdLazyCounter, 5 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 278 SdHoareTripleChecker+Valid, 423 SdHoareTripleChecker+Invalid, 11 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 5 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 03:28:35,285 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [278 Valid, 423 Invalid, 11 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 5 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 03:28:35,287 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 339 states. [2021-11-23 03:28:35,305 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 339 to 316. [2021-11-23 03:28:35,306 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 316 states, 281 states have (on average 1.4199288256227758) internal successors, (399), 282 states have internal predecessors, (399), 22 states have call successors, (22), 11 states have call predecessors, (22), 12 states have return successors, (26), 23 states have call predecessors, (26), 16 states have call successors, (26) [2021-11-23 03:28:35,308 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 316 states to 316 states and 447 transitions. [2021-11-23 03:28:35,308 INFO L78 Accepts]: Start accepts. Automaton has 316 states and 447 transitions. Word has length 37 [2021-11-23 03:28:35,309 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:28:35,309 INFO L470 AbstractCegarLoop]: Abstraction has 316 states and 447 transitions. [2021-11-23 03:28:35,309 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 11.666666666666666) internal successors, (35), 3 states have internal predecessors, (35), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:28:35,309 INFO L276 IsEmpty]: Start isEmpty. Operand 316 states and 447 transitions. [2021-11-23 03:28:35,310 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2021-11-23 03:28:35,311 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:28:35,311 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:28:35,318 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (10)] Forceful destruction successful, exit code 0 [2021-11-23 03:28:35,525 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (9)] Forceful destruction successful, exit code 0 [2021-11-23 03:28:35,714 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 [2021-11-23 03:28:35,714 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting errorFnErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorFnErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:28:35,715 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:28:35,715 INFO L85 PathProgramCache]: Analyzing trace with hash -70139618, now seen corresponding path program 1 times [2021-11-23 03:28:35,715 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 03:28:35,716 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [881056472] [2021-11-23 03:28:35,716 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:28:35,716 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 03:28:35,716 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/mathsat [2021-11-23 03:28:35,717 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 03:28:35,720 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (11)] Waiting until timeout for monitored process [2021-11-23 03:28:36,043 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:28:36,061 INFO L263 TraceCheckSpWp]: Trace formula consists of 303 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 03:28:36,062 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:28:36,347 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:28:36,348 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:28:36,638 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:28:36,638 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 03:28:36,638 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [881056472] [2021-11-23 03:28:36,639 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [881056472] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:28:36,639 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [633952564] [2021-11-23 03:28:36,639 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:28:36,639 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 03:28:36,640 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/cvc4 [2021-11-23 03:28:36,641 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 03:28:36,642 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (12)] Waiting until timeout for monitored process [2021-11-23 03:28:36,927 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:28:36,933 INFO L263 TraceCheckSpWp]: Trace formula consists of 303 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 03:28:36,935 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:28:37,068 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-23 03:28:37,068 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:28:37,147 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-23 03:28:37,148 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [633952564] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-23 03:28:37,148 INFO L186 FreeRefinementEngine]: Found 2 perfect and 2 imperfect interpolant sequences. [2021-11-23 03:28:37,148 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [5, 5] total 9 [2021-11-23 03:28:37,149 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1760398288] [2021-11-23 03:28:37,149 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-23 03:28:37,149 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 03:28:37,149 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 03:28:37,150 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 03:28:37,150 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=48, Unknown=0, NotChecked=0, Total=72 [2021-11-23 03:28:37,150 INFO L87 Difference]: Start difference. First operand 316 states and 447 transitions. Second operand has 3 states, 3 states have (on average 12.333333333333334) internal successors, (37), 3 states have internal predecessors, (37), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:28:37,222 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:28:37,222 INFO L93 Difference]: Finished difference Result 328 states and 462 transitions. [2021-11-23 03:28:37,223 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 03:28:37,223 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 12.333333333333334) internal successors, (37), 3 states have internal predecessors, (37), 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 39 [2021-11-23 03:28:37,223 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:28:37,226 INFO L225 Difference]: With dead ends: 328 [2021-11-23 03:28:37,227 INFO L226 Difference]: Without dead ends: 312 [2021-11-23 03:28:37,227 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 152 GetRequests, 145 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=24, Invalid=48, Unknown=0, NotChecked=0, Total=72 [2021-11-23 03:28:37,228 INFO L933 BasicCegarLoop]: 301 mSDtfsCounter, 296 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 3 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 296 SdHoareTripleChecker+Valid, 301 SdHoareTripleChecker+Invalid, 9 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 3 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 03:28:37,228 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [296 Valid, 301 Invalid, 9 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 3 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 03:28:37,230 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 312 states. [2021-11-23 03:28:37,250 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 312 to 292. [2021-11-23 03:28:37,251 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 292 states, 260 states have (on average 1.4384615384615385) internal successors, (374), 266 states have internal predecessors, (374), 21 states have call successors, (21), 11 states have call predecessors, (21), 10 states have return successors, (22), 15 states have call predecessors, (22), 16 states have call successors, (22) [2021-11-23 03:28:37,253 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 292 states to 292 states and 417 transitions. [2021-11-23 03:28:37,254 INFO L78 Accepts]: Start accepts. Automaton has 292 states and 417 transitions. Word has length 39 [2021-11-23 03:28:37,254 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:28:37,254 INFO L470 AbstractCegarLoop]: Abstraction has 292 states and 417 transitions. [2021-11-23 03:28:37,255 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 12.333333333333334) internal successors, (37), 3 states have internal predecessors, (37), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:28:37,255 INFO L276 IsEmpty]: Start isEmpty. Operand 292 states and 417 transitions. [2021-11-23 03:28:37,256 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2021-11-23 03:28:37,256 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:28:37,256 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:28:37,278 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (11)] Forceful destruction successful, exit code 0 [2021-11-23 03:28:37,478 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (12)] Forceful destruction successful, exit code 0 [2021-11-23 03:28:37,671 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3,12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt [2021-11-23 03:28:37,672 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting errorFnErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorFnErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:28:37,672 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:28:37,672 INFO L85 PathProgramCache]: Analyzing trace with hash 2129167770, now seen corresponding path program 1 times [2021-11-23 03:28:37,673 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 03:28:37,673 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1382455456] [2021-11-23 03:28:37,673 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:28:37,673 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 03:28:37,673 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/mathsat [2021-11-23 03:28:37,674 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 03:28:37,676 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (13)] Waiting until timeout for monitored process [2021-11-23 03:28:37,930 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:28:37,948 INFO L263 TraceCheckSpWp]: Trace formula consists of 304 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 03:28:37,949 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:28:38,221 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:28:38,221 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:28:38,530 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:28:38,530 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 03:28:38,530 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1382455456] [2021-11-23 03:28:38,531 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1382455456] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:28:38,531 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [905395416] [2021-11-23 03:28:38,531 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:28:38,531 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 03:28:38,532 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/cvc4 [2021-11-23 03:28:38,543 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 03:28:38,544 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (14)] Waiting until timeout for monitored process [2021-11-23 03:28:38,862 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:28:38,868 INFO L263 TraceCheckSpWp]: Trace formula consists of 304 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 03:28:38,869 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:28:39,562 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-23 03:28:39,563 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:28:39,992 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-23 03:28:39,992 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [905395416] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-23 03:28:39,992 INFO L186 FreeRefinementEngine]: Found 2 perfect and 2 imperfect interpolant sequences. [2021-11-23 03:28:39,993 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [5, 5] total 12 [2021-11-23 03:28:39,993 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [413484980] [2021-11-23 03:28:39,993 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-23 03:28:39,993 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 03:28:39,993 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 03:28:39,994 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 03:28:39,994 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=100, Unknown=0, NotChecked=0, Total=132 [2021-11-23 03:28:39,994 INFO L87 Difference]: Start difference. First operand 292 states and 417 transitions. Second operand has 6 states, 6 states have (on average 12.166666666666666) internal successors, (73), 6 states have internal predecessors, (73), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:28:42,027 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 03:28:42,592 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:28:42,592 INFO L93 Difference]: Finished difference Result 329 states and 457 transitions. [2021-11-23 03:28:42,592 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 03:28:42,592 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 12.166666666666666) internal successors, (73), 6 states have internal predecessors, (73), 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 03:28:42,593 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:28:42,595 INFO L225 Difference]: With dead ends: 329 [2021-11-23 03:28:42,595 INFO L226 Difference]: Without dead ends: 288 [2021-11-23 03:28:42,596 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 158 GetRequests, 146 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=44, Invalid=138, Unknown=0, NotChecked=0, Total=182 [2021-11-23 03:28:42,597 INFO L933 BasicCegarLoop]: 320 mSDtfsCounter, 701 mSDsluCounter, 71 mSDsCounter, 0 mSdLazyCounter, 101 mSolverCounterSat, 69 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 701 SdHoareTripleChecker+Valid, 391 SdHoareTripleChecker+Invalid, 171 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 69 IncrementalHoareTripleChecker+Valid, 101 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.5s IncrementalHoareTripleChecker+Time [2021-11-23 03:28:42,597 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [701 Valid, 391 Invalid, 171 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [69 Valid, 101 Invalid, 1 Unknown, 0 Unchecked, 2.5s Time] [2021-11-23 03:28:42,598 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 288 states. [2021-11-23 03:28:42,619 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 288 to 285. [2021-11-23 03:28:42,620 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 285 states, 254 states have (on average 1.4291338582677164) internal successors, (363), 259 states have internal predecessors, (363), 21 states have call successors, (21), 11 states have call predecessors, (21), 9 states have return successors, (18), 15 states have call predecessors, (18), 16 states have call successors, (18) [2021-11-23 03:28:42,622 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 285 states to 285 states and 402 transitions. [2021-11-23 03:28:42,622 INFO L78 Accepts]: Start accepts. Automaton has 285 states and 402 transitions. Word has length 40 [2021-11-23 03:28:42,622 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:28:42,623 INFO L470 AbstractCegarLoop]: Abstraction has 285 states and 402 transitions. [2021-11-23 03:28:42,623 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 12.166666666666666) internal successors, (73), 6 states have internal predecessors, (73), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:28:42,623 INFO L276 IsEmpty]: Start isEmpty. Operand 285 states and 402 transitions. [2021-11-23 03:28:42,624 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2021-11-23 03:28:42,624 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:28:42,624 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:28:42,646 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (13)] Forceful destruction successful, exit code 0 [2021-11-23 03:28:42,852 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (14)] Forceful destruction successful, exit code 0 [2021-11-23 03:28:43,047 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3,14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt [2021-11-23 03:28:43,047 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting errorFnErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorFnErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:28:43,047 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:28:43,047 INFO L85 PathProgramCache]: Analyzing trace with hash -860376488, now seen corresponding path program 1 times [2021-11-23 03:28:43,048 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 03:28:43,048 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1352368719] [2021-11-23 03:28:43,048 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:28:43,048 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 03:28:43,048 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/mathsat [2021-11-23 03:28:43,049 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 03:28:43,080 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (15)] Waiting until timeout for monitored process [2021-11-23 03:28:43,360 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:28:43,380 INFO L263 TraceCheckSpWp]: Trace formula consists of 341 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 03:28:43,382 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:28:43,643 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:28:43,643 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:28:43,918 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:28:43,918 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 03:28:43,918 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1352368719] [2021-11-23 03:28:43,919 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1352368719] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:28:43,919 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1463842905] [2021-11-23 03:28:43,919 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:28:43,919 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 03:28:43,919 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/cvc4 [2021-11-23 03:28:43,921 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 03:28:43,930 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (16)] Waiting until timeout for monitored process [2021-11-23 03:28:44,257 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:28:44,264 INFO L263 TraceCheckSpWp]: Trace formula consists of 341 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 03:28:44,266 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:28:44,403 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-23 03:28:44,403 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:28:44,479 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-23 03:28:44,479 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1463842905] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-23 03:28:44,479 INFO L186 FreeRefinementEngine]: Found 2 perfect and 2 imperfect interpolant sequences. [2021-11-23 03:28:44,479 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [5, 5] total 9 [2021-11-23 03:28:44,480 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1462209504] [2021-11-23 03:28:44,480 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-23 03:28:44,480 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 03:28:44,480 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 03:28:44,481 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 03:28:44,481 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=48, Unknown=0, NotChecked=0, Total=72 [2021-11-23 03:28:44,481 INFO L87 Difference]: Start difference. First operand 285 states and 402 transitions. Second operand has 3 states, 3 states have (on average 13.0) internal successors, (39), 3 states have internal predecessors, (39), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:28:46,497 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 03:28:46,729 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:28:46,729 INFO L93 Difference]: Finished difference Result 288 states and 404 transitions. [2021-11-23 03:28:46,730 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 03:28:46,730 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 13.0) internal successors, (39), 3 states have internal predecessors, (39), 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 41 [2021-11-23 03:28:46,730 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:28:46,732 INFO L225 Difference]: With dead ends: 288 [2021-11-23 03:28:46,733 INFO L226 Difference]: Without dead ends: 284 [2021-11-23 03:28:46,733 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 160 GetRequests, 153 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=24, Invalid=48, Unknown=0, NotChecked=0, Total=72 [2021-11-23 03:28:46,734 INFO L933 BasicCegarLoop]: 284 mSDtfsCounter, 26 mSDsluCounter, 233 mSDsCounter, 0 mSdLazyCounter, 44 mSolverCounterSat, 6 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 26 SdHoareTripleChecker+Valid, 517 SdHoareTripleChecker+Invalid, 51 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 44 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.2s IncrementalHoareTripleChecker+Time [2021-11-23 03:28:46,734 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [26 Valid, 517 Invalid, 51 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 44 Invalid, 1 Unknown, 0 Unchecked, 2.2s Time] [2021-11-23 03:28:46,735 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 284 states. [2021-11-23 03:28:46,767 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 284 to 284. [2021-11-23 03:28:46,768 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 284 states, 254 states have (on average 1.421259842519685) internal successors, (361), 258 states have internal predecessors, (361), 20 states have call successors, (20), 11 states have call predecessors, (20), 9 states have return successors, (18), 15 states have call predecessors, (18), 16 states have call successors, (18) [2021-11-23 03:28:46,771 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 284 states to 284 states and 399 transitions. [2021-11-23 03:28:46,771 INFO L78 Accepts]: Start accepts. Automaton has 284 states and 399 transitions. Word has length 41 [2021-11-23 03:28:46,772 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:28:46,772 INFO L470 AbstractCegarLoop]: Abstraction has 284 states and 399 transitions. [2021-11-23 03:28:46,772 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 13.0) internal successors, (39), 3 states have internal predecessors, (39), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:28:46,772 INFO L276 IsEmpty]: Start isEmpty. Operand 284 states and 399 transitions. [2021-11-23 03:28:46,774 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2021-11-23 03:28:46,774 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:28:46,775 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:28:46,782 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (16)] Forceful destruction successful, exit code 0 [2021-11-23 03:28:46,998 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (15)] Forceful destruction successful, exit code 0 [2021-11-23 03:28:47,186 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt,15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 [2021-11-23 03:28:47,186 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting errorFnErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorFnErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:28:47,186 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:28:47,186 INFO L85 PathProgramCache]: Analyzing trace with hash 1810104920, now seen corresponding path program 1 times [2021-11-23 03:28:47,187 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 03:28:47,187 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2127711628] [2021-11-23 03:28:47,187 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:28:47,187 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 03:28:47,188 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/mathsat [2021-11-23 03:28:47,188 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 03:28:47,189 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (17)] Waiting until timeout for monitored process [2021-11-23 03:28:47,479 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:28:47,499 INFO L263 TraceCheckSpWp]: Trace formula consists of 355 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 03:28:47,502 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:28:47,741 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:28:47,742 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:28:48,024 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:28:48,024 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 03:28:48,024 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2127711628] [2021-11-23 03:28:48,024 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2127711628] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:28:48,025 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [744183332] [2021-11-23 03:28:48,025 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:28:48,025 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 03:28:48,025 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/cvc4 [2021-11-23 03:28:48,026 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 03:28:48,027 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (18)] Waiting until timeout for monitored process [2021-11-23 03:28:48,340 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:28:48,348 INFO L263 TraceCheckSpWp]: Trace formula consists of 355 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 03:28:48,350 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:28:49,019 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-23 03:28:49,019 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:28:49,368 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-23 03:28:49,368 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [744183332] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-23 03:28:49,368 INFO L186 FreeRefinementEngine]: Found 2 perfect and 2 imperfect interpolant sequences. [2021-11-23 03:28:49,368 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [5, 5] total 12 [2021-11-23 03:28:49,369 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [858906282] [2021-11-23 03:28:49,369 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-23 03:28:49,369 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 03:28:49,369 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 03:28:49,370 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 03:28:49,370 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=100, Unknown=0, NotChecked=0, Total=132 [2021-11-23 03:28:49,370 INFO L87 Difference]: Start difference. First operand 284 states and 399 transitions. Second operand has 6 states, 6 states have (on average 14.0) internal successors, (84), 6 states have internal predecessors, (84), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:28:51,402 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 03:28:51,914 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:28:51,914 INFO L93 Difference]: Finished difference Result 321 states and 442 transitions. [2021-11-23 03:28:51,915 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 03:28:51,915 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 14.0) internal successors, (84), 6 states have internal predecessors, (84), 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 51 [2021-11-23 03:28:51,915 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:28:51,918 INFO L225 Difference]: With dead ends: 321 [2021-11-23 03:28:51,918 INFO L226 Difference]: Without dead ends: 286 [2021-11-23 03:28:51,919 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 202 GetRequests, 190 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=44, Invalid=138, Unknown=0, NotChecked=0, Total=182 [2021-11-23 03:28:51,920 INFO L933 BasicCegarLoop]: 266 mSDtfsCounter, 323 mSDsluCounter, 212 mSDsCounter, 0 mSdLazyCounter, 86 mSolverCounterSat, 32 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 323 SdHoareTripleChecker+Valid, 478 SdHoareTripleChecker+Invalid, 119 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 32 IncrementalHoareTripleChecker+Valid, 86 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.4s IncrementalHoareTripleChecker+Time [2021-11-23 03:28:51,920 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [323 Valid, 478 Invalid, 119 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [32 Valid, 86 Invalid, 1 Unknown, 0 Unchecked, 2.4s Time] [2021-11-23 03:28:51,922 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 286 states. [2021-11-23 03:28:51,947 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 286 to 284. [2021-11-23 03:28:51,948 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 284 states, 254 states have (on average 1.4133858267716535) internal successors, (359), 258 states have internal predecessors, (359), 20 states have call successors, (20), 11 states have call predecessors, (20), 9 states have return successors, (18), 15 states have call predecessors, (18), 16 states have call successors, (18) [2021-11-23 03:28:51,951 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 284 states to 284 states and 397 transitions. [2021-11-23 03:28:51,951 INFO L78 Accepts]: Start accepts. Automaton has 284 states and 397 transitions. Word has length 51 [2021-11-23 03:28:51,952 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:28:51,952 INFO L470 AbstractCegarLoop]: Abstraction has 284 states and 397 transitions. [2021-11-23 03:28:51,952 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 14.0) internal successors, (84), 6 states have internal predecessors, (84), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:28:51,953 INFO L276 IsEmpty]: Start isEmpty. Operand 284 states and 397 transitions. [2021-11-23 03:28:51,954 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2021-11-23 03:28:51,954 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:28:51,955 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:28:51,983 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (17)] Forceful destruction successful, exit code 0 [2021-11-23 03:28:52,173 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (18)] Forceful destruction successful, exit code 0 [2021-11-23 03:28:52,371 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3,18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt [2021-11-23 03:28:52,371 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting errorFnErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorFnErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:28:52,371 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:28:52,371 INFO L85 PathProgramCache]: Analyzing trace with hash 1796193959, now seen corresponding path program 1 times [2021-11-23 03:28:52,372 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 03:28:52,372 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1566393313] [2021-11-23 03:28:52,372 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:28:52,372 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 03:28:52,373 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/mathsat [2021-11-23 03:28:52,373 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 03:28:52,377 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (19)] Waiting until timeout for monitored process [2021-11-23 03:28:52,655 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:28:52,678 INFO L263 TraceCheckSpWp]: Trace formula consists of 337 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 03:28:52,679 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:28:52,994 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:28:52,994 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:28:53,330 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:28:53,330 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 03:28:53,330 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1566393313] [2021-11-23 03:28:53,330 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1566393313] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:28:53,330 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1793806770] [2021-11-23 03:28:53,330 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:28:53,330 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 03:28:53,331 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/cvc4 [2021-11-23 03:28:53,331 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 03:28:53,336 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (20)] Waiting until timeout for monitored process [2021-11-23 03:28:53,605 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:28:53,611 INFO L263 TraceCheckSpWp]: Trace formula consists of 337 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 03:28:53,613 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:28:54,414 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-23 03:28:54,415 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:28:54,941 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-23 03:28:54,941 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1793806770] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-23 03:28:54,941 INFO L186 FreeRefinementEngine]: Found 2 perfect and 2 imperfect interpolant sequences. [2021-11-23 03:28:54,941 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5, 5] imperfect sequences [5, 5] total 14 [2021-11-23 03:28:54,941 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [843374766] [2021-11-23 03:28:54,941 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-23 03:28:54,942 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-23 03:28:54,942 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 03:28:54,943 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-23 03:28:54,943 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=139, Unknown=0, NotChecked=0, Total=182 [2021-11-23 03:28:54,943 INFO L87 Difference]: Start difference. First operand 284 states and 397 transitions. Second operand has 8 states, 8 states have (on average 11.375) internal successors, (91), 8 states have internal predecessors, (91), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-23 03:28:56,973 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 03:28:57,565 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:28:57,566 INFO L93 Difference]: Finished difference Result 307 states and 421 transitions. [2021-11-23 03:28:57,566 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-23 03:28:57,566 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 11.375) internal successors, (91), 8 states have internal predecessors, (91), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 52 [2021-11-23 03:28:57,567 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:28:57,569 INFO L225 Difference]: With dead ends: 307 [2021-11-23 03:28:57,569 INFO L226 Difference]: Without dead ends: 301 [2021-11-23 03:28:57,569 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 205 GetRequests, 192 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=50, Invalid=160, Unknown=0, NotChecked=0, Total=210 [2021-11-23 03:28:57,569 INFO L933 BasicCegarLoop]: 287 mSDtfsCounter, 557 mSDsluCounter, 439 mSDsCounter, 0 mSdLazyCounter, 132 mSolverCounterSat, 45 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 559 SdHoareTripleChecker+Valid, 726 SdHoareTripleChecker+Invalid, 178 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 45 IncrementalHoareTripleChecker+Valid, 132 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.5s IncrementalHoareTripleChecker+Time [2021-11-23 03:28:57,570 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [559 Valid, 726 Invalid, 178 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [45 Valid, 132 Invalid, 1 Unknown, 0 Unchecked, 2.5s Time] [2021-11-23 03:28:57,571 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 301 states. [2021-11-23 03:28:57,600 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 301 to 293. [2021-11-23 03:28:57,601 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 293 states, 263 states have (on average 1.403041825095057) internal successors, (369), 266 states have internal predecessors, (369), 20 states have call successors, (20), 11 states have call predecessors, (20), 9 states have return successors, (18), 15 states have call predecessors, (18), 16 states have call successors, (18) [2021-11-23 03:28:57,604 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 293 states to 293 states and 407 transitions. [2021-11-23 03:28:57,605 INFO L78 Accepts]: Start accepts. Automaton has 293 states and 407 transitions. Word has length 52 [2021-11-23 03:28:57,606 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:28:57,606 INFO L470 AbstractCegarLoop]: Abstraction has 293 states and 407 transitions. [2021-11-23 03:28:57,606 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 11.375) internal successors, (91), 8 states have internal predecessors, (91), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-23 03:28:57,606 INFO L276 IsEmpty]: Start isEmpty. Operand 293 states and 407 transitions. [2021-11-23 03:28:57,609 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2021-11-23 03:28:57,609 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:28:57,609 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:28:57,618 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (20)] Forceful destruction successful, exit code 0 [2021-11-23 03:28:57,823 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (19)] Forceful destruction successful, exit code 0 [2021-11-23 03:28:58,012 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt,19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 [2021-11-23 03:28:58,013 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting errorFnErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorFnErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:28:58,013 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:28:58,013 INFO L85 PathProgramCache]: Analyzing trace with hash -739706084, now seen corresponding path program 1 times [2021-11-23 03:28:58,014 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 03:28:58,014 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [525263970] [2021-11-23 03:28:58,014 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:28:58,014 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 03:28:58,014 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/mathsat [2021-11-23 03:28:58,015 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 03:28:58,025 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (21)] Waiting until timeout for monitored process [2021-11-23 03:28:58,304 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:28:58,325 INFO L263 TraceCheckSpWp]: Trace formula consists of 389 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 03:28:58,326 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:28:58,615 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:28:58,615 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:28:58,923 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:28:58,923 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 03:28:58,923 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [525263970] [2021-11-23 03:28:58,924 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [525263970] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:28:58,924 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1957780180] [2021-11-23 03:28:58,924 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:28:58,924 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 03:28:58,924 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/cvc4 [2021-11-23 03:28:58,925 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 03:28:58,928 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (22)] Waiting until timeout for monitored process [2021-11-23 03:28:59,222 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:28:59,227 INFO L263 TraceCheckSpWp]: Trace formula consists of 389 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 03:28:59,229 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:28:59,358 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-23 03:28:59,358 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:28:59,428 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-23 03:28:59,428 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1957780180] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-23 03:28:59,428 INFO L186 FreeRefinementEngine]: Found 2 perfect and 2 imperfect interpolant sequences. [2021-11-23 03:28:59,428 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [5, 5] total 9 [2021-11-23 03:28:59,428 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1071879520] [2021-11-23 03:28:59,428 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-23 03:28:59,429 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 03:28:59,429 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 03:28:59,429 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 03:28:59,429 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=48, Unknown=0, NotChecked=0, Total=72 [2021-11-23 03:28:59,429 INFO L87 Difference]: Start difference. First operand 293 states and 407 transitions. Second operand has 3 states, 3 states have (on average 16.0) internal successors, (48), 3 states have internal predecessors, (48), 2 states have call successors, (2), 2 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 03:28:59,620 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:28:59,621 INFO L93 Difference]: Finished difference Result 327 states and 457 transitions. [2021-11-23 03:28:59,623 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 03:28:59,623 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 16.0) internal successors, (48), 3 states have internal predecessors, (48), 2 states have call successors, (2), 2 states have call predecessors, (2), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 52 [2021-11-23 03:28:59,624 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:28:59,626 INFO L225 Difference]: With dead ends: 327 [2021-11-23 03:28:59,626 INFO L226 Difference]: Without dead ends: 324 [2021-11-23 03:28:59,627 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 204 GetRequests, 197 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=24, Invalid=48, Unknown=0, NotChecked=0, Total=72 [2021-11-23 03:28:59,627 INFO L933 BasicCegarLoop]: 307 mSDtfsCounter, 20 mSDsluCounter, 250 mSDsCounter, 0 mSdLazyCounter, 41 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 20 SdHoareTripleChecker+Valid, 557 SdHoareTripleChecker+Invalid, 43 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 41 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 03:28:59,628 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [20 Valid, 557 Invalid, 43 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 41 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-23 03:28:59,629 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 324 states. [2021-11-23 03:28:59,653 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 324 to 299. [2021-11-23 03:28:59,654 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 299 states, 269 states have (on average 1.4052044609665428) internal successors, (378), 272 states have internal predecessors, (378), 20 states have call successors, (20), 11 states have call predecessors, (20), 9 states have return successors, (18), 15 states have call predecessors, (18), 16 states have call successors, (18) [2021-11-23 03:28:59,655 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 299 states to 299 states and 416 transitions. [2021-11-23 03:28:59,656 INFO L78 Accepts]: Start accepts. Automaton has 299 states and 416 transitions. Word has length 52 [2021-11-23 03:28:59,656 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:28:59,656 INFO L470 AbstractCegarLoop]: Abstraction has 299 states and 416 transitions. [2021-11-23 03:28:59,656 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 16.0) internal successors, (48), 3 states have internal predecessors, (48), 2 states have call successors, (2), 2 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 03:28:59,657 INFO L276 IsEmpty]: Start isEmpty. Operand 299 states and 416 transitions. [2021-11-23 03:28:59,658 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2021-11-23 03:28:59,658 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:28:59,658 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:28:59,675 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (22)] Forceful destruction successful, exit code 0 [2021-11-23 03:28:59,876 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (21)] Forceful destruction successful, exit code 0 [2021-11-23 03:29:00,061 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt,21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 [2021-11-23 03:29:00,062 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting errorFnErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorFnErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:29:00,062 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:29:00,062 INFO L85 PathProgramCache]: Analyzing trace with hash -153691215, now seen corresponding path program 1 times [2021-11-23 03:29:00,063 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 03:29:00,063 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1911518169] [2021-11-23 03:29:00,063 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:29:00,064 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 03:29:00,064 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/mathsat [2021-11-23 03:29:00,064 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 03:29:00,065 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (23)] Waiting until timeout for monitored process [2021-11-23 03:29:00,362 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:29:00,380 INFO L263 TraceCheckSpWp]: Trace formula consists of 338 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 03:29:00,382 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:29:00,643 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:29:00,643 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:29:00,957 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:29:00,958 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 03:29:00,958 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1911518169] [2021-11-23 03:29:00,958 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1911518169] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:29:00,959 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [880407725] [2021-11-23 03:29:00,959 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:29:00,959 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 03:29:00,959 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/cvc4 [2021-11-23 03:29:00,968 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 03:29:00,982 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (24)] Waiting until timeout for monitored process [2021-11-23 03:29:01,256 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:29:01,262 INFO L263 TraceCheckSpWp]: Trace formula consists of 338 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 03:29:01,263 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:29:02,038 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-23 03:29:02,039 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:29:02,567 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-23 03:29:02,567 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [880407725] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-23 03:29:02,567 INFO L186 FreeRefinementEngine]: Found 2 perfect and 2 imperfect interpolant sequences. [2021-11-23 03:29:02,568 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5, 5] imperfect sequences [5, 5] total 14 [2021-11-23 03:29:02,568 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1364131071] [2021-11-23 03:29:02,568 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-23 03:29:02,568 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-23 03:29:02,568 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 03:29:02,569 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-23 03:29:02,569 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=139, Unknown=0, NotChecked=0, Total=182 [2021-11-23 03:29:02,569 INFO L87 Difference]: Start difference. First operand 299 states and 416 transitions. Second operand has 8 states, 8 states have (on average 11.625) internal successors, (93), 8 states have internal predecessors, (93), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-23 03:29:04,598 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 03:29:06,610 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 03:29:07,080 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:29:07,080 INFO L93 Difference]: Finished difference Result 311 states and 427 transitions. [2021-11-23 03:29:07,081 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-23 03:29:07,081 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 11.625) internal successors, (93), 8 states have internal predecessors, (93), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 53 [2021-11-23 03:29:07,082 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:29:07,084 INFO L225 Difference]: With dead ends: 311 [2021-11-23 03:29:07,084 INFO L226 Difference]: Without dead ends: 305 [2021-11-23 03:29:07,084 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 210 GetRequests, 197 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=50, Invalid=160, Unknown=0, NotChecked=0, Total=210 [2021-11-23 03:29:07,085 INFO L933 BasicCegarLoop]: 289 mSDtfsCounter, 522 mSDsluCounter, 225 mSDsCounter, 0 mSdLazyCounter, 75 mSolverCounterSat, 38 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 522 SdHoareTripleChecker+Valid, 514 SdHoareTripleChecker+Invalid, 115 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 38 IncrementalHoareTripleChecker+Valid, 75 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.4s IncrementalHoareTripleChecker+Time [2021-11-23 03:29:07,085 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [522 Valid, 514 Invalid, 115 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [38 Valid, 75 Invalid, 2 Unknown, 0 Unchecked, 4.4s Time] [2021-11-23 03:29:07,086 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 305 states. [2021-11-23 03:29:07,108 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 305 to 300. [2021-11-23 03:29:07,109 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 300 states, 270 states have (on average 1.4037037037037037) internal successors, (379), 273 states have internal predecessors, (379), 20 states have call successors, (20), 11 states have call predecessors, (20), 9 states have return successors, (18), 15 states have call predecessors, (18), 16 states have call successors, (18) [2021-11-23 03:29:07,111 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 300 states to 300 states and 417 transitions. [2021-11-23 03:29:07,112 INFO L78 Accepts]: Start accepts. Automaton has 300 states and 417 transitions. Word has length 53 [2021-11-23 03:29:07,112 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:29:07,112 INFO L470 AbstractCegarLoop]: Abstraction has 300 states and 417 transitions. [2021-11-23 03:29:07,113 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 11.625) internal successors, (93), 8 states have internal predecessors, (93), 3 states have call successors, (3), 3 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-23 03:29:07,113 INFO L276 IsEmpty]: Start isEmpty. Operand 300 states and 417 transitions. [2021-11-23 03:29:07,114 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2021-11-23 03:29:07,114 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:29:07,114 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:29:07,118 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (24)] Forceful destruction successful, exit code 0 [2021-11-23 03:29:07,330 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (23)] Ended with exit code 0 [2021-11-23 03:29:07,518 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt,23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 [2021-11-23 03:29:07,518 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting errorFnErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorFnErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:29:07,518 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:29:07,518 INFO L85 PathProgramCache]: Analyzing trace with hash -2040740656, now seen corresponding path program 1 times [2021-11-23 03:29:07,519 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 03:29:07,519 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [218310155] [2021-11-23 03:29:07,519 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:29:07,519 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 03:29:07,519 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/mathsat [2021-11-23 03:29:07,520 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 03:29:07,521 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (25)] Waiting until timeout for monitored process [2021-11-23 03:29:07,812 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:29:07,835 INFO L263 TraceCheckSpWp]: Trace formula consists of 388 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 03:29:07,836 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:29:08,120 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:29:08,120 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:29:08,428 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:29:08,429 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 03:29:08,429 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [218310155] [2021-11-23 03:29:08,429 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [218310155] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:29:08,429 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [2141382372] [2021-11-23 03:29:08,429 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:29:08,429 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 03:29:08,429 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/cvc4 [2021-11-23 03:29:08,430 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 03:29:08,431 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (26)] Waiting until timeout for monitored process [2021-11-23 03:29:08,722 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:29:08,730 INFO L263 TraceCheckSpWp]: Trace formula consists of 388 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 03:29:08,732 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:29:08,895 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-23 03:29:08,896 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:29:09,141 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-23 03:29:09,141 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [2141382372] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-23 03:29:09,141 INFO L186 FreeRefinementEngine]: Found 2 perfect and 2 imperfect interpolant sequences. [2021-11-23 03:29:09,142 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 4] imperfect sequences [5, 5] total 11 [2021-11-23 03:29:09,142 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1295299878] [2021-11-23 03:29:09,142 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-23 03:29:09,142 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 03:29:09,142 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 03:29:09,142 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 03:29:09,143 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=81, Unknown=0, NotChecked=0, Total=110 [2021-11-23 03:29:09,143 INFO L87 Difference]: Start difference. First operand 300 states and 417 transitions. Second operand has 5 states, 5 states have (on average 11.6) internal successors, (58), 5 states have internal predecessors, (58), 3 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-23 03:29:11,163 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 03:29:11,378 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:29:11,379 INFO L93 Difference]: Finished difference Result 339 states and 454 transitions. [2021-11-23 03:29:11,379 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 03:29:11,379 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 11.6) internal successors, (58), 5 states have internal predecessors, (58), 3 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) Word has length 54 [2021-11-23 03:29:11,380 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:29:11,382 INFO L225 Difference]: With dead ends: 339 [2021-11-23 03:29:11,383 INFO L226 Difference]: Without dead ends: 282 [2021-11-23 03:29:11,383 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 212 GetRequests, 203 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=29, Invalid=81, Unknown=0, NotChecked=0, Total=110 [2021-11-23 03:29:11,384 INFO L933 BasicCegarLoop]: 323 mSDtfsCounter, 381 mSDsluCounter, 288 mSDsCounter, 0 mSdLazyCounter, 42 mSolverCounterSat, 16 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 381 SdHoareTripleChecker+Valid, 611 SdHoareTripleChecker+Invalid, 59 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 16 IncrementalHoareTripleChecker+Valid, 42 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.2s IncrementalHoareTripleChecker+Time [2021-11-23 03:29:11,385 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [381 Valid, 611 Invalid, 59 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [16 Valid, 42 Invalid, 1 Unknown, 0 Unchecked, 2.2s Time] [2021-11-23 03:29:11,386 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 282 states. [2021-11-23 03:29:11,410 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 282 to 268. [2021-11-23 03:29:11,411 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 268 states, 240 states have (on average 1.3875) internal successors, (333), 243 states have internal predecessors, (333), 18 states have call successors, (18), 10 states have call predecessors, (18), 9 states have return successors, (15), 14 states have call predecessors, (15), 14 states have call successors, (15) [2021-11-23 03:29:11,413 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 268 states to 268 states and 366 transitions. [2021-11-23 03:29:11,413 INFO L78 Accepts]: Start accepts. Automaton has 268 states and 366 transitions. Word has length 54 [2021-11-23 03:29:11,414 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:29:11,414 INFO L470 AbstractCegarLoop]: Abstraction has 268 states and 366 transitions. [2021-11-23 03:29:11,414 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 11.6) internal successors, (58), 5 states have internal predecessors, (58), 3 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (2), 1 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-23 03:29:11,414 INFO L276 IsEmpty]: Start isEmpty. Operand 268 states and 366 transitions. [2021-11-23 03:29:11,416 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2021-11-23 03:29:11,416 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:29:11,416 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:29:11,444 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (25)] Forceful destruction successful, exit code 0 [2021-11-23 03:29:11,647 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (26)] Forceful destruction successful, exit code 0 [2021-11-23 03:29:11,841 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3,26 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt [2021-11-23 03:29:11,841 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting errorFnErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorFnErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:29:11,842 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:29:11,842 INFO L85 PathProgramCache]: Analyzing trace with hash -609183715, now seen corresponding path program 1 times [2021-11-23 03:29:11,842 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 03:29:11,843 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1989690416] [2021-11-23 03:29:11,843 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:29:11,843 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 03:29:11,843 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/mathsat [2021-11-23 03:29:11,844 INFO L229 MonitoredProcess]: Starting monitored process 27 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 03:29:11,845 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (27)] Waiting until timeout for monitored process [2021-11-23 03:29:12,141 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:29:12,165 INFO L263 TraceCheckSpWp]: Trace formula consists of 357 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 03:29:12,166 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:29:12,484 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:29:12,484 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:29:12,811 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:29:12,812 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 03:29:12,812 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1989690416] [2021-11-23 03:29:12,812 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1989690416] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:29:12,812 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1531384529] [2021-11-23 03:29:12,812 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:29:12,812 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 03:29:12,812 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/cvc4 [2021-11-23 03:29:12,813 INFO L229 MonitoredProcess]: Starting monitored process 28 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 03:29:12,814 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (28)] Waiting until timeout for monitored process [2021-11-23 03:29:13,097 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:29:13,104 INFO L263 TraceCheckSpWp]: Trace formula consists of 357 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 03:29:13,106 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:29:13,746 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-23 03:29:13,746 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:29:14,163 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-23 03:29:14,163 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1531384529] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-23 03:29:14,163 INFO L186 FreeRefinementEngine]: Found 2 perfect and 2 imperfect interpolant sequences. [2021-11-23 03:29:14,164 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [5, 5] total 12 [2021-11-23 03:29:14,164 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1560966588] [2021-11-23 03:29:14,164 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-23 03:29:14,165 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 03:29:14,165 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 03:29:14,165 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 03:29:14,166 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=100, Unknown=0, NotChecked=0, Total=132 [2021-11-23 03:29:14,166 INFO L87 Difference]: Start difference. First operand 268 states and 366 transitions. Second operand has 6 states, 6 states have (on average 14.5) internal successors, (87), 6 states have internal predecessors, (87), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:29:16,202 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.02s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 03:29:16,929 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:29:16,929 INFO L93 Difference]: Finished difference Result 305 states and 409 transitions. [2021-11-23 03:29:16,930 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 03:29:16,930 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 14.5) internal successors, (87), 6 states have internal predecessors, (87), 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 53 [2021-11-23 03:29:16,930 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:29:16,933 INFO L225 Difference]: With dead ends: 305 [2021-11-23 03:29:16,933 INFO L226 Difference]: Without dead ends: 268 [2021-11-23 03:29:16,934 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 210 GetRequests, 198 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=44, Invalid=138, Unknown=0, NotChecked=0, Total=182 [2021-11-23 03:29:16,935 INFO L933 BasicCegarLoop]: 274 mSDtfsCounter, 530 mSDsluCounter, 417 mSDsCounter, 0 mSdLazyCounter, 126 mSolverCounterSat, 53 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 530 SdHoareTripleChecker+Valid, 691 SdHoareTripleChecker+Invalid, 180 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 53 IncrementalHoareTripleChecker+Valid, 126 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.6s IncrementalHoareTripleChecker+Time [2021-11-23 03:29:16,935 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [530 Valid, 691 Invalid, 180 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [53 Valid, 126 Invalid, 1 Unknown, 0 Unchecked, 2.6s Time] [2021-11-23 03:29:16,936 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 268 states. [2021-11-23 03:29:16,961 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 268 to 266. [2021-11-23 03:29:16,962 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 266 states, 238 states have (on average 1.3823529411764706) internal successors, (329), 241 states have internal predecessors, (329), 18 states have call successors, (18), 10 states have call predecessors, (18), 9 states have return successors, (15), 14 states have call predecessors, (15), 14 states have call successors, (15) [2021-11-23 03:29:16,963 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 266 states to 266 states and 362 transitions. [2021-11-23 03:29:16,964 INFO L78 Accepts]: Start accepts. Automaton has 266 states and 362 transitions. Word has length 53 [2021-11-23 03:29:16,964 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:29:16,964 INFO L470 AbstractCegarLoop]: Abstraction has 266 states and 362 transitions. [2021-11-23 03:29:16,964 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 14.5) internal successors, (87), 6 states have internal predecessors, (87), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:29:16,965 INFO L276 IsEmpty]: Start isEmpty. Operand 266 states and 362 transitions. [2021-11-23 03:29:16,966 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2021-11-23 03:29:16,966 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:29:16,966 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:29:16,995 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (27)] Forceful destruction successful, exit code 0 [2021-11-23 03:29:17,186 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (28)] Ended with exit code 0 [2021-11-23 03:29:17,384 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3,28 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt [2021-11-23 03:29:17,384 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting errorFnErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorFnErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:29:17,385 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:29:17,385 INFO L85 PathProgramCache]: Analyzing trace with hash -1222977251, now seen corresponding path program 1 times [2021-11-23 03:29:17,385 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 03:29:17,386 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2127656794] [2021-11-23 03:29:17,386 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:29:17,386 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 03:29:17,386 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/mathsat [2021-11-23 03:29:17,387 INFO L229 MonitoredProcess]: Starting monitored process 29 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 03:29:17,390 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (29)] Waiting until timeout for monitored process [2021-11-23 03:29:17,695 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:29:17,717 INFO L263 TraceCheckSpWp]: Trace formula consists of 357 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 03:29:17,719 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:29:18,052 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:29:18,052 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:29:18,451 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:29:18,451 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 03:29:18,451 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2127656794] [2021-11-23 03:29:18,452 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2127656794] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:29:18,452 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [611312498] [2021-11-23 03:29:18,452 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:29:18,452 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 03:29:18,452 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/cvc4 [2021-11-23 03:29:18,453 INFO L229 MonitoredProcess]: Starting monitored process 30 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 03:29:18,454 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (30)] Waiting until timeout for monitored process [2021-11-23 03:29:18,756 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:29:18,763 INFO L263 TraceCheckSpWp]: Trace formula consists of 357 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-23 03:29:18,767 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:29:19,631 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-23 03:29:19,631 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:29:20,166 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-23 03:29:20,167 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [611312498] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-23 03:29:20,167 INFO L186 FreeRefinementEngine]: Found 2 perfect and 2 imperfect interpolant sequences. [2021-11-23 03:29:20,167 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5, 5] imperfect sequences [5, 5] total 14 [2021-11-23 03:29:20,167 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2134873009] [2021-11-23 03:29:20,167 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-23 03:29:20,168 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-23 03:29:20,168 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 03:29:20,168 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-23 03:29:20,168 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=141, Unknown=0, NotChecked=0, Total=182 [2021-11-23 03:29:20,169 INFO L87 Difference]: Start difference. First operand 266 states and 362 transitions. Second operand has 8 states, 8 states have (on average 12.375) internal successors, (99), 8 states have internal predecessors, (99), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:29:22,204 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.02s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 03:29:24,211 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 03:29:24,990 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:29:24,990 INFO L93 Difference]: Finished difference Result 300 states and 405 transitions. [2021-11-23 03:29:24,991 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-23 03:29:24,991 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 12.375) internal successors, (99), 8 states have internal predecessors, (99), 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 53 [2021-11-23 03:29:24,992 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:29:24,993 INFO L225 Difference]: With dead ends: 300 [2021-11-23 03:29:24,993 INFO L226 Difference]: Without dead ends: 185 [2021-11-23 03:29:24,994 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 210 GetRequests, 196 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=57, Invalid=183, Unknown=0, NotChecked=0, Total=240 [2021-11-23 03:29:24,995 INFO L933 BasicCegarLoop]: 297 mSDtfsCounter, 307 mSDsluCounter, 492 mSDsCounter, 0 mSdLazyCounter, 190 mSolverCounterSat, 29 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 318 SdHoareTripleChecker+Valid, 789 SdHoareTripleChecker+Invalid, 221 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 29 IncrementalHoareTripleChecker+Valid, 190 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.7s IncrementalHoareTripleChecker+Time [2021-11-23 03:29:24,995 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [318 Valid, 789 Invalid, 221 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [29 Valid, 190 Invalid, 2 Unknown, 0 Unchecked, 4.7s Time] [2021-11-23 03:29:24,996 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 185 states. [2021-11-23 03:29:25,013 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 185 to 160. [2021-11-23 03:29:25,014 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 160 states, 143 states have (on average 1.3426573426573427) internal successors, (192), 146 states have internal predecessors, (192), 10 states have call successors, (10), 7 states have call predecessors, (10), 6 states have return successors, (7), 6 states have call predecessors, (7), 6 states have call successors, (7) [2021-11-23 03:29:25,015 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 160 states to 160 states and 209 transitions. [2021-11-23 03:29:25,015 INFO L78 Accepts]: Start accepts. Automaton has 160 states and 209 transitions. Word has length 53 [2021-11-23 03:29:25,016 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:29:25,016 INFO L470 AbstractCegarLoop]: Abstraction has 160 states and 209 transitions. [2021-11-23 03:29:25,016 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 12.375) internal successors, (99), 8 states have internal predecessors, (99), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 03:29:25,016 INFO L276 IsEmpty]: Start isEmpty. Operand 160 states and 209 transitions. [2021-11-23 03:29:25,017 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2021-11-23 03:29:25,017 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:29:25,017 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:29:25,028 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (30)] Forceful destruction successful, exit code 0 [2021-11-23 03:29:25,232 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (29)] Ended with exit code 0 [2021-11-23 03:29:25,421 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 30 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt,29 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 [2021-11-23 03:29:25,421 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting errorFnErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorFnErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:29:25,421 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:29:25,421 INFO L85 PathProgramCache]: Analyzing trace with hash 473577872, now seen corresponding path program 1 times [2021-11-23 03:29:25,422 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 03:29:25,422 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1679537667] [2021-11-23 03:29:25,422 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:29:25,422 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 03:29:25,422 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/mathsat [2021-11-23 03:29:25,423 INFO L229 MonitoredProcess]: Starting monitored process 31 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 03:29:25,424 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (31)] Waiting until timeout for monitored process [2021-11-23 03:29:25,693 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:29:25,714 INFO L263 TraceCheckSpWp]: Trace formula consists of 339 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 03:29:25,715 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:29:25,972 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:29:25,972 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:29:26,258 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:29:26,258 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 03:29:26,258 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1679537667] [2021-11-23 03:29:26,258 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1679537667] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:29:26,258 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1298567432] [2021-11-23 03:29:26,258 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:29:26,258 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 03:29:26,259 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/cvc4 [2021-11-23 03:29:26,259 INFO L229 MonitoredProcess]: Starting monitored process 32 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 03:29:26,264 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (32)] Waiting until timeout for monitored process [2021-11-23 03:29:26,562 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:29:26,569 INFO L263 TraceCheckSpWp]: Trace formula consists of 339 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 03:29:26,570 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:29:26,839 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-23 03:29:26,839 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:29:27,147 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-23 03:29:27,147 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1298567432] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-23 03:29:27,147 INFO L186 FreeRefinementEngine]: Found 2 perfect and 2 imperfect interpolant sequences. [2021-11-23 03:29:27,147 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5, 5] imperfect sequences [5, 5] total 14 [2021-11-23 03:29:27,147 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1156872980] [2021-11-23 03:29:27,147 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-23 03:29:27,148 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-23 03:29:27,148 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 03:29:27,148 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-23 03:29:27,148 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=145, Unknown=0, NotChecked=0, Total=182 [2021-11-23 03:29:27,148 INFO L87 Difference]: Start difference. First operand 160 states and 209 transitions. Second operand has 8 states, 8 states have (on average 8.125) internal successors, (65), 8 states have internal predecessors, (65), 3 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-23 03:29:29,179 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.03s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 03:29:29,746 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:29:29,746 INFO L93 Difference]: Finished difference Result 189 states and 240 transitions. [2021-11-23 03:29:29,747 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-23 03:29:29,747 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 8.125) internal successors, (65), 8 states have internal predecessors, (65), 3 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 54 [2021-11-23 03:29:29,747 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:29:29,748 INFO L225 Difference]: With dead ends: 189 [2021-11-23 03:29:29,748 INFO L226 Difference]: Without dead ends: 129 [2021-11-23 03:29:29,749 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 216 GetRequests, 200 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=65, Invalid=241, Unknown=0, NotChecked=0, Total=306 [2021-11-23 03:29:29,750 INFO L933 BasicCegarLoop]: 169 mSDtfsCounter, 81 mSDsluCounter, 753 mSDsCounter, 0 mSdLazyCounter, 36 mSolverCounterSat, 5 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 81 SdHoareTripleChecker+Valid, 922 SdHoareTripleChecker+Invalid, 42 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 36 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.4s IncrementalHoareTripleChecker+Time [2021-11-23 03:29:29,750 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [81 Valid, 922 Invalid, 42 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 36 Invalid, 1 Unknown, 0 Unchecked, 2.4s Time] [2021-11-23 03:29:29,751 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 129 states. [2021-11-23 03:29:29,763 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 129 to 129. [2021-11-23 03:29:29,764 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 129 states, 114 states have (on average 1.2982456140350878) internal successors, (148), 117 states have internal predecessors, (148), 9 states have call successors, (9), 6 states have call predecessors, (9), 5 states have return successors, (6), 5 states have call predecessors, (6), 5 states have call successors, (6) [2021-11-23 03:29:29,765 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 129 states to 129 states and 163 transitions. [2021-11-23 03:29:29,765 INFO L78 Accepts]: Start accepts. Automaton has 129 states and 163 transitions. Word has length 54 [2021-11-23 03:29:29,765 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:29:29,765 INFO L470 AbstractCegarLoop]: Abstraction has 129 states and 163 transitions. [2021-11-23 03:29:29,765 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 8.125) internal successors, (65), 8 states have internal predecessors, (65), 3 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-23 03:29:29,766 INFO L276 IsEmpty]: Start isEmpty. Operand 129 states and 163 transitions. [2021-11-23 03:29:29,766 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2021-11-23 03:29:29,766 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:29:29,767 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:29:29,770 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (32)] Forceful destruction successful, exit code 0 [2021-11-23 03:29:29,980 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (31)] Forceful destruction successful, exit code 0 [2021-11-23 03:29:30,169 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 32 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt,31 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 [2021-11-23 03:29:30,170 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting errorFnErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorFnErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:29:30,170 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:29:30,170 INFO L85 PathProgramCache]: Analyzing trace with hash 903237165, now seen corresponding path program 1 times [2021-11-23 03:29:30,171 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 03:29:30,171 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [15512854] [2021-11-23 03:29:30,171 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:29:30,171 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 03:29:30,171 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/mathsat [2021-11-23 03:29:30,172 INFO L229 MonitoredProcess]: Starting monitored process 33 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 03:29:30,173 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (33)] Waiting until timeout for monitored process [2021-11-23 03:29:30,467 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:29:30,488 INFO L263 TraceCheckSpWp]: Trace formula consists of 406 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 03:29:30,490 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:29:30,753 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:29:30,754 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:29:31,039 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:29:31,039 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 03:29:31,040 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [15512854] [2021-11-23 03:29:31,040 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [15512854] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:29:31,040 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1933599455] [2021-11-23 03:29:31,040 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:29:31,040 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 03:29:31,040 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/cvc4 [2021-11-23 03:29:31,041 INFO L229 MonitoredProcess]: Starting monitored process 34 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 03:29:31,042 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (34)] Waiting until timeout for monitored process [2021-11-23 03:29:31,325 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:29:31,331 INFO L263 TraceCheckSpWp]: Trace formula consists of 406 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 03:29:31,332 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:29:31,457 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-23 03:29:31,458 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:29:31,565 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-23 03:29:31,566 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1933599455] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-23 03:29:31,566 INFO L186 FreeRefinementEngine]: Found 2 perfect and 2 imperfect interpolant sequences. [2021-11-23 03:29:31,566 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [5, 5] total 9 [2021-11-23 03:29:31,566 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [546299743] [2021-11-23 03:29:31,566 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-23 03:29:31,567 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 03:29:31,567 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 03:29:31,567 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 03:29:31,567 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=48, Unknown=0, NotChecked=0, Total=72 [2021-11-23 03:29:31,568 INFO L87 Difference]: Start difference. First operand 129 states and 163 transitions. Second operand has 3 states, 3 states have (on average 16.666666666666668) internal successors, (50), 3 states have internal predecessors, (50), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2021-11-23 03:29:33,584 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 03:29:33,676 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:29:33,677 INFO L93 Difference]: Finished difference Result 180 states and 228 transitions. [2021-11-23 03:29:33,677 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 03:29:33,677 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 16.666666666666668) internal successors, (50), 3 states have internal predecessors, (50), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) Word has length 57 [2021-11-23 03:29:33,677 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:29:33,678 INFO L225 Difference]: With dead ends: 180 [2021-11-23 03:29:33,679 INFO L226 Difference]: Without dead ends: 127 [2021-11-23 03:29:33,679 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 224 GetRequests, 217 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=24, Invalid=48, Unknown=0, NotChecked=0, Total=72 [2021-11-23 03:29:33,680 INFO L933 BasicCegarLoop]: 120 mSDtfsCounter, 6 mSDsluCounter, 89 mSDsCounter, 0 mSdLazyCounter, 23 mSolverCounterSat, 1 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 209 SdHoareTripleChecker+Invalid, 25 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 23 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.1s IncrementalHoareTripleChecker+Time [2021-11-23 03:29:33,681 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [6 Valid, 209 Invalid, 25 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 23 Invalid, 1 Unknown, 0 Unchecked, 2.1s Time] [2021-11-23 03:29:33,681 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 127 states. [2021-11-23 03:29:33,700 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 127 to 127. [2021-11-23 03:29:33,700 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 127 states, 113 states have (on average 1.2831858407079646) internal successors, (145), 115 states have internal predecessors, (145), 8 states have call successors, (8), 6 states have call predecessors, (8), 5 states have return successors, (6), 5 states have call predecessors, (6), 5 states have call successors, (6) [2021-11-23 03:29:33,701 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 127 states to 127 states and 159 transitions. [2021-11-23 03:29:33,701 INFO L78 Accepts]: Start accepts. Automaton has 127 states and 159 transitions. Word has length 57 [2021-11-23 03:29:33,701 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:29:33,701 INFO L470 AbstractCegarLoop]: Abstraction has 127 states and 159 transitions. [2021-11-23 03:29:33,701 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 16.666666666666668) internal successors, (50), 3 states have internal predecessors, (50), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2021-11-23 03:29:33,701 INFO L276 IsEmpty]: Start isEmpty. Operand 127 states and 159 transitions. [2021-11-23 03:29:33,702 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2021-11-23 03:29:33,702 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:29:33,702 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:29:33,708 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (34)] Forceful destruction successful, exit code 0 [2021-11-23 03:29:33,917 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (33)] Ended with exit code 0 [2021-11-23 03:29:34,106 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 34 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt,33 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 [2021-11-23 03:29:34,106 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting errorFnErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorFnErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:29:34,106 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:29:34,106 INFO L85 PathProgramCache]: Analyzing trace with hash -1330385375, now seen corresponding path program 1 times [2021-11-23 03:29:34,107 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 03:29:34,107 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [607353436] [2021-11-23 03:29:34,107 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:29:34,107 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 03:29:34,107 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/mathsat [2021-11-23 03:29:34,108 INFO L229 MonitoredProcess]: Starting monitored process 35 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 03:29:34,142 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (35)] Waiting until timeout for monitored process [2021-11-23 03:29:34,511 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:29:34,534 INFO L263 TraceCheckSpWp]: Trace formula consists of 420 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 03:29:34,536 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:29:34,808 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:29:34,808 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:29:35,092 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:29:35,092 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 03:29:35,092 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [607353436] [2021-11-23 03:29:35,092 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [607353436] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:29:35,092 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [891694369] [2021-11-23 03:29:35,092 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:29:35,092 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 03:29:35,093 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/cvc4 [2021-11-23 03:29:35,093 INFO L229 MonitoredProcess]: Starting monitored process 36 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 03:29:35,094 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (36)] Waiting until timeout for monitored process [2021-11-23 03:29:35,386 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:29:35,392 INFO L263 TraceCheckSpWp]: Trace formula consists of 420 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 03:29:35,393 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:29:35,626 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-23 03:29:35,626 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:29:35,865 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-23 03:29:35,865 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [891694369] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-23 03:29:35,865 INFO L186 FreeRefinementEngine]: Found 2 perfect and 2 imperfect interpolant sequences. [2021-11-23 03:29:35,866 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5, 5] imperfect sequences [5, 5] total 11 [2021-11-23 03:29:35,866 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1224979803] [2021-11-23 03:29:35,866 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-23 03:29:35,866 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-23 03:29:35,866 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 03:29:35,866 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-23 03:29:35,866 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=82, Unknown=0, NotChecked=0, Total=110 [2021-11-23 03:29:35,867 INFO L87 Difference]: Start difference. First operand 127 states and 159 transitions. Second operand has 5 states, 5 states have (on average 10.8) internal successors, (54), 4 states have internal predecessors, (54), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2021-11-23 03:29:35,896 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:29:35,896 INFO L93 Difference]: Finished difference Result 178 states and 224 transitions. [2021-11-23 03:29:35,898 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 03:29:35,898 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 10.8) internal successors, (54), 4 states have internal predecessors, (54), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) Word has length 61 [2021-11-23 03:29:35,899 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:29:35,900 INFO L225 Difference]: With dead ends: 178 [2021-11-23 03:29:35,900 INFO L226 Difference]: Without dead ends: 121 [2021-11-23 03:29:35,900 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 240 GetRequests, 231 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=28, Invalid=82, Unknown=0, NotChecked=0, Total=110 [2021-11-23 03:29:35,901 INFO L933 BasicCegarLoop]: 112 mSDtfsCounter, 15 mSDsluCounter, 317 mSDsCounter, 0 mSdLazyCounter, 7 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 16 SdHoareTripleChecker+Valid, 429 SdHoareTripleChecker+Invalid, 7 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 7 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 03:29:35,901 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [16 Valid, 429 Invalid, 7 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 7 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 03:29:35,902 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 121 states. [2021-11-23 03:29:35,914 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 121 to 121. [2021-11-23 03:29:35,914 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 121 states, 107 states have (on average 1.2710280373831775) internal successors, (136), 109 states have internal predecessors, (136), 8 states have call successors, (8), 6 states have call predecessors, (8), 5 states have return successors, (6), 5 states have call predecessors, (6), 5 states have call successors, (6) [2021-11-23 03:29:35,915 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 121 states to 121 states and 150 transitions. [2021-11-23 03:29:35,915 INFO L78 Accepts]: Start accepts. Automaton has 121 states and 150 transitions. Word has length 61 [2021-11-23 03:29:35,915 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:29:35,916 INFO L470 AbstractCegarLoop]: Abstraction has 121 states and 150 transitions. [2021-11-23 03:29:35,916 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 10.8) internal successors, (54), 4 states have internal predecessors, (54), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2021-11-23 03:29:35,916 INFO L276 IsEmpty]: Start isEmpty. Operand 121 states and 150 transitions. [2021-11-23 03:29:35,917 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2021-11-23 03:29:35,917 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:29:35,917 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:29:35,936 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (35)] Forceful destruction successful, exit code 0 [2021-11-23 03:29:36,133 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (36)] Forceful destruction successful, exit code 0 [2021-11-23 03:29:36,330 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 35 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3,36 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt [2021-11-23 03:29:36,331 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting errorFnErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorFnErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:29:36,331 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:29:36,331 INFO L85 PathProgramCache]: Analyzing trace with hash -34108152, now seen corresponding path program 1 times [2021-11-23 03:29:36,332 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 03:29:36,332 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [574904111] [2021-11-23 03:29:36,332 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:29:36,332 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 03:29:36,332 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/mathsat [2021-11-23 03:29:36,333 INFO L229 MonitoredProcess]: Starting monitored process 37 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 03:29:36,335 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (37)] Waiting until timeout for monitored process [2021-11-23 03:29:36,668 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:29:36,693 INFO L263 TraceCheckSpWp]: Trace formula consists of 427 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 03:29:36,695 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:29:37,039 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:29:37,039 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:29:37,365 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:29:37,365 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 03:29:37,366 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [574904111] [2021-11-23 03:29:37,366 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [574904111] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:29:37,366 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [529713408] [2021-11-23 03:29:37,366 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:29:37,366 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 03:29:37,367 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/cvc4 [2021-11-23 03:29:37,367 INFO L229 MonitoredProcess]: Starting monitored process 38 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 03:29:37,368 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (38)] Waiting until timeout for monitored process [2021-11-23 03:29:37,694 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:29:37,703 INFO L263 TraceCheckSpWp]: Trace formula consists of 427 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 03:29:37,706 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:29:38,710 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-23 03:29:38,710 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:29:39,349 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-23 03:29:39,349 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [529713408] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-23 03:29:39,350 INFO L186 FreeRefinementEngine]: Found 2 perfect and 2 imperfect interpolant sequences. [2021-11-23 03:29:39,350 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 5] imperfect sequences [5, 5] total 13 [2021-11-23 03:29:39,350 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1765180757] [2021-11-23 03:29:39,350 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-23 03:29:39,351 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-23 03:29:39,351 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 03:29:39,351 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-23 03:29:39,352 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=119, Unknown=0, NotChecked=0, Total=156 [2021-11-23 03:29:39,352 INFO L87 Difference]: Start difference. First operand 121 states and 150 transitions. Second operand has 7 states, 7 states have (on average 14.857142857142858) internal successors, (104), 7 states have internal predecessors, (104), 4 states have call successors, (8), 3 states have call predecessors, (8), 6 states have return successors, (6), 5 states have call predecessors, (6), 3 states have call successors, (6) [2021-11-23 03:29:41,379 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.02s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 03:29:43,388 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 03:29:43,729 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:29:43,729 INFO L93 Difference]: Finished difference Result 174 states and 216 transitions. [2021-11-23 03:29:43,730 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-23 03:29:43,730 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 14.857142857142858) internal successors, (104), 7 states have internal predecessors, (104), 4 states have call successors, (8), 3 states have call predecessors, (8), 6 states have return successors, (6), 5 states have call predecessors, (6), 3 states have call successors, (6) Word has length 65 [2021-11-23 03:29:43,730 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:29:43,735 INFO L225 Difference]: With dead ends: 174 [2021-11-23 03:29:43,735 INFO L226 Difference]: Without dead ends: 123 [2021-11-23 03:29:43,736 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 257 GetRequests, 245 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 21 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=43, Invalid=139, Unknown=0, NotChecked=0, Total=182 [2021-11-23 03:29:43,736 INFO L933 BasicCegarLoop]: 103 mSDtfsCounter, 149 mSDsluCounter, 162 mSDsCounter, 0 mSdLazyCounter, 62 mSolverCounterSat, 18 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 150 SdHoareTripleChecker+Valid, 265 SdHoareTripleChecker+Invalid, 82 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 18 IncrementalHoareTripleChecker+Valid, 62 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.3s IncrementalHoareTripleChecker+Time [2021-11-23 03:29:43,737 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [150 Valid, 265 Invalid, 82 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [18 Valid, 62 Invalid, 2 Unknown, 0 Unchecked, 4.3s Time] [2021-11-23 03:29:43,737 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 123 states. [2021-11-23 03:29:43,754 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 123 to 121. [2021-11-23 03:29:43,754 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 121 states, 107 states have (on average 1.2616822429906542) internal successors, (135), 109 states have internal predecessors, (135), 8 states have call successors, (8), 6 states have call predecessors, (8), 5 states have return successors, (6), 5 states have call predecessors, (6), 5 states have call successors, (6) [2021-11-23 03:29:43,755 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 121 states to 121 states and 149 transitions. [2021-11-23 03:29:43,755 INFO L78 Accepts]: Start accepts. Automaton has 121 states and 149 transitions. Word has length 65 [2021-11-23 03:29:43,756 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:29:43,756 INFO L470 AbstractCegarLoop]: Abstraction has 121 states and 149 transitions. [2021-11-23 03:29:43,756 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 14.857142857142858) internal successors, (104), 7 states have internal predecessors, (104), 4 states have call successors, (8), 3 states have call predecessors, (8), 6 states have return successors, (6), 5 states have call predecessors, (6), 3 states have call successors, (6) [2021-11-23 03:29:43,756 INFO L276 IsEmpty]: Start isEmpty. Operand 121 states and 149 transitions. [2021-11-23 03:29:43,759 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2021-11-23 03:29:43,759 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:29:43,759 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:29:43,778 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (37)] Forceful destruction successful, exit code 0 [2021-11-23 03:29:43,976 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (38)] Forceful destruction successful, exit code 0 [2021-11-23 03:29:44,170 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 37 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3,38 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt [2021-11-23 03:29:44,171 INFO L402 AbstractCegarLoop]: === Iteration 22 === Targeting errorFnErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorFnErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:29:44,171 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:29:44,171 INFO L85 PathProgramCache]: Analyzing trace with hash 1386695981, now seen corresponding path program 1 times [2021-11-23 03:29:44,172 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 03:29:44,172 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [647324694] [2021-11-23 03:29:44,172 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:29:44,172 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 03:29:44,172 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/mathsat [2021-11-23 03:29:44,173 INFO L229 MonitoredProcess]: Starting monitored process 39 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 03:29:44,174 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (39)] Waiting until timeout for monitored process [2021-11-23 03:29:44,644 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:29:44,669 INFO L263 TraceCheckSpWp]: Trace formula consists of 429 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 03:29:44,671 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:29:44,956 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:29:44,956 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:29:45,272 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:29:45,273 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 03:29:45,273 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [647324694] [2021-11-23 03:29:45,273 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [647324694] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:29:45,273 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1124021981] [2021-11-23 03:29:45,273 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:29:45,273 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 03:29:45,273 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/cvc4 [2021-11-23 03:29:45,274 INFO L229 MonitoredProcess]: Starting monitored process 40 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 03:29:45,275 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (40)] Waiting until timeout for monitored process [2021-11-23 03:29:45,568 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:29:45,575 INFO L263 TraceCheckSpWp]: Trace formula consists of 429 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 03:29:45,576 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:29:45,736 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-23 03:29:45,736 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:29:45,923 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-23 03:29:45,923 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1124021981] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-23 03:29:45,923 INFO L186 FreeRefinementEngine]: Found 2 perfect and 2 imperfect interpolant sequences. [2021-11-23 03:29:45,923 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [5, 5] total 10 [2021-11-23 03:29:45,923 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1886032348] [2021-11-23 03:29:45,923 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-23 03:29:45,924 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 03:29:45,924 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 03:29:45,924 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 03:29:45,924 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=63, Unknown=0, NotChecked=0, Total=90 [2021-11-23 03:29:45,924 INFO L87 Difference]: Start difference. First operand 121 states and 149 transitions. Second operand has 4 states, 4 states have (on average 15.5) internal successors, (62), 4 states have internal predecessors, (62), 2 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2021-11-23 03:29:45,968 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:29:45,969 INFO L93 Difference]: Finished difference Result 181 states and 225 transitions. [2021-11-23 03:29:45,971 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 03:29:45,971 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 15.5) internal successors, (62), 4 states have internal predecessors, (62), 2 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) Word has length 67 [2021-11-23 03:29:45,972 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:29:45,973 INFO L225 Difference]: With dead ends: 181 [2021-11-23 03:29:45,973 INFO L226 Difference]: Without dead ends: 130 [2021-11-23 03:29:45,973 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 264 GetRequests, 256 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=27, Invalid=63, Unknown=0, NotChecked=0, Total=90 [2021-11-23 03:29:45,974 INFO L933 BasicCegarLoop]: 111 mSDtfsCounter, 9 mSDsluCounter, 109 mSDsCounter, 0 mSdLazyCounter, 9 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 9 SdHoareTripleChecker+Valid, 220 SdHoareTripleChecker+Invalid, 11 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 9 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 03:29:45,975 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [9 Valid, 220 Invalid, 11 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 9 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 03:29:45,976 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 130 states. [2021-11-23 03:29:45,988 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 130 to 124. [2021-11-23 03:29:45,989 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 124 states, 110 states have (on average 1.2545454545454546) internal successors, (138), 112 states have internal predecessors, (138), 8 states have call successors, (8), 6 states have call predecessors, (8), 5 states have return successors, (6), 5 states have call predecessors, (6), 5 states have call successors, (6) [2021-11-23 03:29:45,990 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 124 states to 124 states and 152 transitions. [2021-11-23 03:29:45,990 INFO L78 Accepts]: Start accepts. Automaton has 124 states and 152 transitions. Word has length 67 [2021-11-23 03:29:45,990 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:29:45,990 INFO L470 AbstractCegarLoop]: Abstraction has 124 states and 152 transitions. [2021-11-23 03:29:45,991 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 15.5) internal successors, (62), 4 states have internal predecessors, (62), 2 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2021-11-23 03:29:45,991 INFO L276 IsEmpty]: Start isEmpty. Operand 124 states and 152 transitions. [2021-11-23 03:29:45,991 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2021-11-23 03:29:45,992 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:29:45,992 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:29:45,995 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (40)] Forceful destruction successful, exit code 0 [2021-11-23 03:29:46,206 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (39)] Ended with exit code 0 [2021-11-23 03:29:46,394 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 40 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt,39 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 [2021-11-23 03:29:46,395 INFO L402 AbstractCegarLoop]: === Iteration 23 === Targeting errorFnErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorFnErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:29:46,395 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:29:46,395 INFO L85 PathProgramCache]: Analyzing trace with hash 1722907821, now seen corresponding path program 1 times [2021-11-23 03:29:46,396 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 03:29:46,396 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1767727713] [2021-11-23 03:29:46,396 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:29:46,396 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 03:29:46,396 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/mathsat [2021-11-23 03:29:46,397 INFO L229 MonitoredProcess]: Starting monitored process 41 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 03:29:46,399 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (41)] Waiting until timeout for monitored process [2021-11-23 03:29:46,700 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:29:46,724 INFO L263 TraceCheckSpWp]: Trace formula consists of 431 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 03:29:46,725 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:29:47,069 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:29:47,070 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:29:47,362 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:29:47,362 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 03:29:47,362 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1767727713] [2021-11-23 03:29:47,362 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1767727713] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:29:47,362 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [2047550253] [2021-11-23 03:29:47,362 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:29:47,362 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 03:29:47,363 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/cvc4 [2021-11-23 03:29:47,363 INFO L229 MonitoredProcess]: Starting monitored process 42 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 03:29:47,364 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (42)] Waiting until timeout for monitored process [2021-11-23 03:29:47,650 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:29:47,656 INFO L263 TraceCheckSpWp]: Trace formula consists of 431 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 03:29:47,657 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:29:47,904 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-23 03:29:47,904 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:29:48,142 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-23 03:29:48,142 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [2047550253] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-23 03:29:48,142 INFO L186 FreeRefinementEngine]: Found 2 perfect and 2 imperfect interpolant sequences. [2021-11-23 03:29:48,143 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [5, 5] total 9 [2021-11-23 03:29:48,143 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1941281182] [2021-11-23 03:29:48,143 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-23 03:29:48,143 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 03:29:48,143 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 03:29:48,144 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 03:29:48,144 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=48, Unknown=0, NotChecked=0, Total=72 [2021-11-23 03:29:48,144 INFO L87 Difference]: Start difference. First operand 124 states and 152 transitions. Second operand has 3 states, 3 states have (on average 20.0) internal successors, (60), 3 states have internal predecessors, (60), 3 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (4), 1 states have call predecessors, (4), 2 states have call successors, (4) [2021-11-23 03:29:50,163 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 03:29:50,203 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:29:50,203 INFO L93 Difference]: Finished difference Result 191 states and 230 transitions. [2021-11-23 03:29:50,203 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 03:29:50,204 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 20.0) internal successors, (60), 3 states have internal predecessors, (60), 3 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (4), 1 states have call predecessors, (4), 2 states have call successors, (4) Word has length 66 [2021-11-23 03:29:50,204 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:29:50,205 INFO L225 Difference]: With dead ends: 191 [2021-11-23 03:29:50,205 INFO L226 Difference]: Without dead ends: 147 [2021-11-23 03:29:50,205 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 260 GetRequests, 253 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=24, Invalid=48, Unknown=0, NotChecked=0, Total=72 [2021-11-23 03:29:50,206 INFO L933 BasicCegarLoop]: 115 mSDtfsCounter, 44 mSDsluCounter, 71 mSDsCounter, 0 mSdLazyCounter, 5 mSolverCounterSat, 0 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 44 SdHoareTripleChecker+Valid, 186 SdHoareTripleChecker+Invalid, 6 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 5 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.0s IncrementalHoareTripleChecker+Time [2021-11-23 03:29:50,206 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [44 Valid, 186 Invalid, 6 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 5 Invalid, 1 Unknown, 0 Unchecked, 2.0s Time] [2021-11-23 03:29:50,207 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 147 states. [2021-11-23 03:29:50,220 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 147 to 130. [2021-11-23 03:29:50,221 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 130 states, 115 states have (on average 1.2173913043478262) internal successors, (140), 117 states have internal predecessors, (140), 8 states have call successors, (8), 7 states have call predecessors, (8), 6 states have return successors, (7), 5 states have call predecessors, (7), 6 states have call successors, (7) [2021-11-23 03:29:50,221 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 130 states to 130 states and 155 transitions. [2021-11-23 03:29:50,222 INFO L78 Accepts]: Start accepts. Automaton has 130 states and 155 transitions. Word has length 66 [2021-11-23 03:29:50,222 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:29:50,222 INFO L470 AbstractCegarLoop]: Abstraction has 130 states and 155 transitions. [2021-11-23 03:29:50,222 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 20.0) internal successors, (60), 3 states have internal predecessors, (60), 3 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (4), 1 states have call predecessors, (4), 2 states have call successors, (4) [2021-11-23 03:29:50,223 INFO L276 IsEmpty]: Start isEmpty. Operand 130 states and 155 transitions. [2021-11-23 03:29:50,223 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2021-11-23 03:29:50,224 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:29:50,224 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:29:50,255 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (41)] Forceful destruction successful, exit code 0 [2021-11-23 03:29:50,441 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (42)] Ended with exit code 0 [2021-11-23 03:29:50,638 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 41 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3,42 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt [2021-11-23 03:29:50,639 INFO L402 AbstractCegarLoop]: === Iteration 24 === Targeting errorFnErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorFnErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:29:50,639 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:29:50,640 INFO L85 PathProgramCache]: Analyzing trace with hash -656407702, now seen corresponding path program 1 times [2021-11-23 03:29:50,640 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 03:29:50,641 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1438893229] [2021-11-23 03:29:50,641 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:29:50,641 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 03:29:50,641 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/mathsat [2021-11-23 03:29:50,642 INFO L229 MonitoredProcess]: Starting monitored process 43 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 03:29:50,644 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (43)] Waiting until timeout for monitored process [2021-11-23 03:29:50,977 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:29:51,001 INFO L263 TraceCheckSpWp]: Trace formula consists of 430 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 03:29:51,002 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:29:51,318 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:29:51,318 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:29:51,654 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:29:51,654 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 03:29:51,654 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1438893229] [2021-11-23 03:29:51,654 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1438893229] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:29:51,654 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1658733662] [2021-11-23 03:29:51,654 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:29:51,654 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 03:29:51,655 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/cvc4 [2021-11-23 03:29:51,655 INFO L229 MonitoredProcess]: Starting monitored process 44 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 03:29:51,656 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (44)] Waiting until timeout for monitored process [2021-11-23 03:29:51,976 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:29:51,983 INFO L263 TraceCheckSpWp]: Trace formula consists of 430 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 03:29:51,984 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:29:52,287 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-23 03:29:52,287 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:29:52,533 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-23 03:29:52,534 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1658733662] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-23 03:29:52,534 INFO L186 FreeRefinementEngine]: Found 2 perfect and 2 imperfect interpolant sequences. [2021-11-23 03:29:52,534 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6, 6] imperfect sequences [5, 5] total 12 [2021-11-23 03:29:52,534 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1212128485] [2021-11-23 03:29:52,535 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-23 03:29:52,535 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 03:29:52,535 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 03:29:52,535 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 03:29:52,536 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=102, Unknown=0, NotChecked=0, Total=132 [2021-11-23 03:29:52,536 INFO L87 Difference]: Start difference. First operand 130 states and 155 transitions. Second operand has 6 states, 6 states have (on average 9.833333333333334) internal successors, (59), 5 states have internal predecessors, (59), 2 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2021-11-23 03:29:52,982 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:29:52,982 INFO L93 Difference]: Finished difference Result 204 states and 246 transitions. [2021-11-23 03:29:52,982 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-23 03:29:52,983 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 9.833333333333334) internal successors, (59), 5 states have internal predecessors, (59), 2 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) Word has length 68 [2021-11-23 03:29:52,983 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:29:52,984 INFO L225 Difference]: With dead ends: 204 [2021-11-23 03:29:52,984 INFO L226 Difference]: Without dead ends: 148 [2021-11-23 03:29:52,985 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 269 GetRequests, 258 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=34, Invalid=122, Unknown=0, NotChecked=0, Total=156 [2021-11-23 03:29:52,986 INFO L933 BasicCegarLoop]: 131 mSDtfsCounter, 33 mSDsluCounter, 475 mSDsCounter, 0 mSdLazyCounter, 42 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 34 SdHoareTripleChecker+Valid, 606 SdHoareTripleChecker+Invalid, 46 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 42 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-23 03:29:52,986 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [34 Valid, 606 Invalid, 46 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 42 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-23 03:29:52,987 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 148 states. [2021-11-23 03:29:53,000 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 148 to 131. [2021-11-23 03:29:53,000 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 131 states, 116 states have (on average 1.1810344827586208) internal successors, (137), 118 states have internal predecessors, (137), 8 states have call successors, (8), 7 states have call predecessors, (8), 6 states have return successors, (7), 5 states have call predecessors, (7), 6 states have call successors, (7) [2021-11-23 03:29:53,001 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 131 states to 131 states and 152 transitions. [2021-11-23 03:29:53,001 INFO L78 Accepts]: Start accepts. Automaton has 131 states and 152 transitions. Word has length 68 [2021-11-23 03:29:53,001 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:29:53,002 INFO L470 AbstractCegarLoop]: Abstraction has 131 states and 152 transitions. [2021-11-23 03:29:53,002 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 9.833333333333334) internal successors, (59), 5 states have internal predecessors, (59), 2 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2021-11-23 03:29:53,002 INFO L276 IsEmpty]: Start isEmpty. Operand 131 states and 152 transitions. [2021-11-23 03:29:53,002 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2021-11-23 03:29:53,002 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:29:53,003 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:29:53,016 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (43)] Ended with exit code 0 [2021-11-23 03:29:53,206 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (44)] Forceful destruction successful, exit code 0 [2021-11-23 03:29:53,403 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 43 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3,44 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt [2021-11-23 03:29:53,403 INFO L402 AbstractCegarLoop]: === Iteration 25 === Targeting errorFnErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorFnErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:29:53,404 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:29:53,404 INFO L85 PathProgramCache]: Analyzing trace with hash 1763675699, now seen corresponding path program 1 times [2021-11-23 03:29:53,404 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 03:29:53,405 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2043065334] [2021-11-23 03:29:53,405 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:29:53,405 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 03:29:53,405 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/mathsat [2021-11-23 03:29:53,405 INFO L229 MonitoredProcess]: Starting monitored process 45 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 03:29:53,406 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (45)] Waiting until timeout for monitored process [2021-11-23 03:29:53,735 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:29:53,760 INFO L263 TraceCheckSpWp]: Trace formula consists of 458 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 03:29:53,762 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:29:54,135 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:29:54,135 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:29:54,516 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:29:54,517 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 03:29:54,517 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2043065334] [2021-11-23 03:29:54,517 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2043065334] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:29:54,517 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1103370249] [2021-11-23 03:29:54,517 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:29:54,517 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 03:29:54,517 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/cvc4 [2021-11-23 03:29:54,518 INFO L229 MonitoredProcess]: Starting monitored process 46 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 03:29:54,519 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (46)] Waiting until timeout for monitored process [2021-11-23 03:29:54,831 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:29:54,838 INFO L263 TraceCheckSpWp]: Trace formula consists of 458 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 03:29:54,840 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:29:55,075 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-23 03:29:55,076 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:29:55,294 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-23 03:29:55,294 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1103370249] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-23 03:29:55,294 INFO L186 FreeRefinementEngine]: Found 2 perfect and 2 imperfect interpolant sequences. [2021-11-23 03:29:55,294 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [5, 5] total 9 [2021-11-23 03:29:55,295 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1394804620] [2021-11-23 03:29:55,295 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-23 03:29:55,295 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 03:29:55,295 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 03:29:55,295 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 03:29:55,296 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=24, Invalid=48, Unknown=0, NotChecked=0, Total=72 [2021-11-23 03:29:55,296 INFO L87 Difference]: Start difference. First operand 131 states and 152 transitions. Second operand has 3 states, 3 states have (on average 22.0) internal successors, (66), 3 states have internal predecessors, (66), 2 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2021-11-23 03:29:57,321 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.02s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 03:29:57,411 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:29:57,411 INFO L93 Difference]: Finished difference Result 159 states and 182 transitions. [2021-11-23 03:29:57,412 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 03:29:57,412 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 22.0) internal successors, (66), 3 states have internal predecessors, (66), 2 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) Word has length 75 [2021-11-23 03:29:57,412 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:29:57,413 INFO L225 Difference]: With dead ends: 159 [2021-11-23 03:29:57,413 INFO L226 Difference]: Without dead ends: 118 [2021-11-23 03:29:57,413 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 296 GetRequests, 289 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=24, Invalid=48, Unknown=0, NotChecked=0, Total=72 [2021-11-23 03:29:57,414 INFO L933 BasicCegarLoop]: 113 mSDtfsCounter, 0 mSDsluCounter, 87 mSDsCounter, 0 mSdLazyCounter, 18 mSolverCounterSat, 2 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 200 SdHoareTripleChecker+Invalid, 21 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 18 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.1s IncrementalHoareTripleChecker+Time [2021-11-23 03:29:57,414 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 200 Invalid, 21 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 18 Invalid, 1 Unknown, 0 Unchecked, 2.1s Time] [2021-11-23 03:29:57,415 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 118 states. [2021-11-23 03:29:57,424 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 118 to 106. [2021-11-23 03:29:57,424 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 106 states, 95 states have (on average 1.1473684210526316) internal successors, (109), 95 states have internal predecessors, (109), 5 states have call successors, (5), 5 states have call predecessors, (5), 5 states have return successors, (5), 5 states have call predecessors, (5), 4 states have call successors, (5) [2021-11-23 03:29:57,425 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 106 states to 106 states and 119 transitions. [2021-11-23 03:29:57,425 INFO L78 Accepts]: Start accepts. Automaton has 106 states and 119 transitions. Word has length 75 [2021-11-23 03:29:57,425 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:29:57,426 INFO L470 AbstractCegarLoop]: Abstraction has 106 states and 119 transitions. [2021-11-23 03:29:57,426 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 22.0) internal successors, (66), 3 states have internal predecessors, (66), 2 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2021-11-23 03:29:57,426 INFO L276 IsEmpty]: Start isEmpty. Operand 106 states and 119 transitions. [2021-11-23 03:29:57,427 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2021-11-23 03:29:57,427 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:29:57,427 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:29:57,463 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (45)] Ended with exit code 0 [2021-11-23 03:29:57,655 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (46)] Forceful destruction successful, exit code 0 [2021-11-23 03:29:57,851 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 45 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3,46 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt [2021-11-23 03:29:57,851 INFO L402 AbstractCegarLoop]: === Iteration 26 === Targeting errorFnErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorFnErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:29:57,851 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:29:57,852 INFO L85 PathProgramCache]: Analyzing trace with hash -639446477, now seen corresponding path program 1 times [2021-11-23 03:29:57,852 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 03:29:57,852 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [2082701991] [2021-11-23 03:29:57,852 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:29:57,853 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 03:29:57,853 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/mathsat [2021-11-23 03:29:57,853 INFO L229 MonitoredProcess]: Starting monitored process 47 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 03:29:57,855 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (47)] Waiting until timeout for monitored process [2021-11-23 03:29:58,189 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:29:58,217 INFO L263 TraceCheckSpWp]: Trace formula consists of 446 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 03:29:58,219 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:29:58,593 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:29:58,593 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:29:58,961 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:29:58,962 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 03:29:58,962 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [2082701991] [2021-11-23 03:29:58,962 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [2082701991] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:29:58,962 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [817051606] [2021-11-23 03:29:58,962 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:29:58,962 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 03:29:58,962 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/cvc4 [2021-11-23 03:29:58,963 INFO L229 MonitoredProcess]: Starting monitored process 48 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 03:29:58,965 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (48)] Waiting until timeout for monitored process [2021-11-23 03:29:59,404 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:29:59,413 INFO L263 TraceCheckSpWp]: Trace formula consists of 446 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-23 03:29:59,415 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:29:59,950 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-23 03:29:59,950 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:30:00,694 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-23 03:30:00,695 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [817051606] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-23 03:30:00,695 INFO L186 FreeRefinementEngine]: Found 2 perfect and 2 imperfect interpolant sequences. [2021-11-23 03:30:00,695 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8, 8] imperfect sequences [5, 5] total 20 [2021-11-23 03:30:00,695 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1543034646] [2021-11-23 03:30:00,695 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-23 03:30:00,696 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2021-11-23 03:30:00,696 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 03:30:00,696 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-11-23 03:30:00,696 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=52, Invalid=328, Unknown=0, NotChecked=0, Total=380 [2021-11-23 03:30:00,697 INFO L87 Difference]: Start difference. First operand 106 states and 119 transitions. Second operand has 14 states, 14 states have (on average 6.785714285714286) internal successors, (95), 12 states have internal predecessors, (95), 4 states have call successors, (6), 2 states have call predecessors, (6), 3 states have return successors, (6), 5 states have call predecessors, (6), 3 states have call successors, (6) [2021-11-23 03:30:02,712 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 03:30:04,720 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 03:30:06,521 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:30:06,522 INFO L93 Difference]: Finished difference Result 176 states and 199 transitions. [2021-11-23 03:30:06,522 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-11-23 03:30:06,522 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 6.785714285714286) internal successors, (95), 12 states have internal predecessors, (95), 4 states have call successors, (6), 2 states have call predecessors, (6), 3 states have return successors, (6), 5 states have call predecessors, (6), 3 states have call successors, (6) Word has length 82 [2021-11-23 03:30:06,522 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:30:06,523 INFO L225 Difference]: With dead ends: 176 [2021-11-23 03:30:06,523 INFO L226 Difference]: Without dead ends: 92 [2021-11-23 03:30:06,524 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 332 GetRequests, 306 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 74 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=103, Invalid=653, Unknown=0, NotChecked=0, Total=756 [2021-11-23 03:30:06,525 INFO L933 BasicCegarLoop]: 106 mSDtfsCounter, 72 mSDsluCounter, 949 mSDsCounter, 0 mSdLazyCounter, 146 mSolverCounterSat, 5 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 5.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 75 SdHoareTripleChecker+Valid, 1055 SdHoareTripleChecker+Invalid, 153 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 146 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 5.3s IncrementalHoareTripleChecker+Time [2021-11-23 03:30:06,525 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [75 Valid, 1055 Invalid, 153 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 146 Invalid, 2 Unknown, 0 Unchecked, 5.3s Time] [2021-11-23 03:30:06,526 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 92 states. [2021-11-23 03:30:06,538 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 92 to 92. [2021-11-23 03:30:06,538 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 92 states, 82 states have (on average 1.0975609756097562) internal successors, (90), 82 states have internal predecessors, (90), 5 states have call successors, (5), 5 states have call predecessors, (5), 4 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-11-23 03:30:06,539 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 92 states to 92 states and 99 transitions. [2021-11-23 03:30:06,539 INFO L78 Accepts]: Start accepts. Automaton has 92 states and 99 transitions. Word has length 82 [2021-11-23 03:30:06,540 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:30:06,540 INFO L470 AbstractCegarLoop]: Abstraction has 92 states and 99 transitions. [2021-11-23 03:30:06,540 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 6.785714285714286) internal successors, (95), 12 states have internal predecessors, (95), 4 states have call successors, (6), 2 states have call predecessors, (6), 3 states have return successors, (6), 5 states have call predecessors, (6), 3 states have call successors, (6) [2021-11-23 03:30:06,540 INFO L276 IsEmpty]: Start isEmpty. Operand 92 states and 99 transitions. [2021-11-23 03:30:06,541 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2021-11-23 03:30:06,541 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:30:06,541 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:30:06,561 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (48)] Forceful destruction successful, exit code 0 [2021-11-23 03:30:06,758 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (47)] Forceful destruction successful, exit code 0 [2021-11-23 03:30:06,946 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 48 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt,47 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 [2021-11-23 03:30:06,952 INFO L402 AbstractCegarLoop]: === Iteration 27 === Targeting errorFnErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorFnErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:30:06,953 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:30:06,953 INFO L85 PathProgramCache]: Analyzing trace with hash 442767075, now seen corresponding path program 1 times [2021-11-23 03:30:06,954 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 03:30:06,954 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [426170387] [2021-11-23 03:30:06,954 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:30:06,955 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 03:30:06,955 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/mathsat [2021-11-23 03:30:06,956 INFO L229 MonitoredProcess]: Starting monitored process 49 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 03:30:06,958 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (49)] Waiting until timeout for monitored process [2021-11-23 03:30:07,290 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:30:07,315 INFO L263 TraceCheckSpWp]: Trace formula consists of 476 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 03:30:07,317 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:30:07,725 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:30:07,725 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:30:08,087 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:30:08,087 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 03:30:08,087 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [426170387] [2021-11-23 03:30:08,087 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [426170387] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:30:08,088 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1121751943] [2021-11-23 03:30:08,088 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:30:08,088 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 03:30:08,088 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/cvc4 [2021-11-23 03:30:08,090 INFO L229 MonitoredProcess]: Starting monitored process 50 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 03:30:08,091 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (50)] Waiting until timeout for monitored process [2021-11-23 03:30:08,417 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:30:08,426 INFO L263 TraceCheckSpWp]: Trace formula consists of 476 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-23 03:30:08,428 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:30:08,749 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-23 03:30:08,749 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:30:08,983 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-23 03:30:08,983 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1121751943] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-23 03:30:08,984 INFO L186 FreeRefinementEngine]: Found 2 perfect and 2 imperfect interpolant sequences. [2021-11-23 03:30:08,984 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [5, 5] total 10 [2021-11-23 03:30:08,984 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [415059260] [2021-11-23 03:30:08,984 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-23 03:30:08,984 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 03:30:08,984 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 03:30:08,985 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 03:30:08,985 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=63, Unknown=0, NotChecked=0, Total=90 [2021-11-23 03:30:08,985 INFO L87 Difference]: Start difference. First operand 92 states and 99 transitions. Second operand has 4 states, 4 states have (on average 25.25) internal successors, (101), 4 states have internal predecessors, (101), 2 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) [2021-11-23 03:30:11,068 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.17s for a HTC check with result INVALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 03:30:13,084 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 03:30:13,128 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:30:13,129 INFO L93 Difference]: Finished difference Result 154 states and 166 transitions. [2021-11-23 03:30:13,129 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 03:30:13,129 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 25.25) internal successors, (101), 4 states have internal predecessors, (101), 2 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) Word has length 89 [2021-11-23 03:30:13,130 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:30:13,130 INFO L225 Difference]: With dead ends: 154 [2021-11-23 03:30:13,130 INFO L226 Difference]: Without dead ends: 94 [2021-11-23 03:30:13,131 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 352 GetRequests, 344 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=27, Invalid=63, Unknown=0, NotChecked=0, Total=90 [2021-11-23 03:30:13,131 INFO L933 BasicCegarLoop]: 96 mSDtfsCounter, 0 mSDsluCounter, 184 mSDsCounter, 0 mSdLazyCounter, 8 mSolverCounterSat, 1 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 280 SdHoareTripleChecker+Invalid, 10 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 8 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.1s IncrementalHoareTripleChecker+Time [2021-11-23 03:30:13,131 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 280 Invalid, 10 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 8 Invalid, 1 Unknown, 0 Unchecked, 4.1s Time] [2021-11-23 03:30:13,132 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2021-11-23 03:30:13,143 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 94. [2021-11-23 03:30:13,143 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 94 states, 84 states have (on average 1.0952380952380953) internal successors, (92), 84 states have internal predecessors, (92), 5 states have call successors, (5), 5 states have call predecessors, (5), 4 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-11-23 03:30:13,144 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 94 states to 94 states and 101 transitions. [2021-11-23 03:30:13,144 INFO L78 Accepts]: Start accepts. Automaton has 94 states and 101 transitions. Word has length 89 [2021-11-23 03:30:13,144 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:30:13,144 INFO L470 AbstractCegarLoop]: Abstraction has 94 states and 101 transitions. [2021-11-23 03:30:13,145 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 25.25) internal successors, (101), 4 states have internal predecessors, (101), 2 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) [2021-11-23 03:30:13,145 INFO L276 IsEmpty]: Start isEmpty. Operand 94 states and 101 transitions. [2021-11-23 03:30:13,145 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 92 [2021-11-23 03:30:13,146 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:30:13,146 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:30:13,158 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (50)] Forceful destruction successful, exit code 0 [2021-11-23 03:30:13,362 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (49)] Ended with exit code 0 [2021-11-23 03:30:13,550 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 50 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt,49 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 [2021-11-23 03:30:13,550 INFO L402 AbstractCegarLoop]: === Iteration 28 === Targeting errorFnErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorFnErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:30:13,550 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:30:13,550 INFO L85 PathProgramCache]: Analyzing trace with hash 572401667, now seen corresponding path program 1 times [2021-11-23 03:30:13,551 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 03:30:13,551 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1769705265] [2021-11-23 03:30:13,551 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:30:13,552 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 03:30:13,552 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/mathsat [2021-11-23 03:30:13,552 INFO L229 MonitoredProcess]: Starting monitored process 51 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 03:30:13,554 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (51)] Waiting until timeout for monitored process [2021-11-23 03:30:13,933 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:30:13,968 INFO L263 TraceCheckSpWp]: Trace formula consists of 512 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 03:30:13,969 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:30:14,397 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-23 03:30:14,397 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:30:14,849 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-23 03:30:14,849 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 03:30:14,850 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1769705265] [2021-11-23 03:30:14,850 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1769705265] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:30:14,850 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [365207287] [2021-11-23 03:30:14,850 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:30:14,850 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 03:30:14,850 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/cvc4 [2021-11-23 03:30:14,861 INFO L229 MonitoredProcess]: Starting monitored process 52 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 03:30:14,863 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (52)] Waiting until timeout for monitored process [2021-11-23 03:30:15,293 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:30:15,304 INFO L263 TraceCheckSpWp]: Trace formula consists of 512 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-23 03:30:15,306 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:30:15,797 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-23 03:30:15,797 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:30:16,075 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-23 03:30:16,075 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [365207287] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-23 03:30:16,075 INFO L186 FreeRefinementEngine]: Found 2 perfect and 2 imperfect interpolant sequences. [2021-11-23 03:30:16,075 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4, 4] imperfect sequences [5, 5] total 12 [2021-11-23 03:30:16,076 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [214264258] [2021-11-23 03:30:16,076 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-23 03:30:16,076 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-23 03:30:16,076 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 03:30:16,076 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-23 03:30:16,076 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=97, Unknown=0, NotChecked=0, Total=132 [2021-11-23 03:30:16,077 INFO L87 Difference]: Start difference. First operand 94 states and 101 transitions. Second operand has 6 states, 6 states have (on average 17.333333333333332) internal successors, (104), 6 states have internal predecessors, (104), 2 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) [2021-11-23 03:30:18,792 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.99s for a HTC check with result INVALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 03:30:18,901 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:30:18,901 INFO L93 Difference]: Finished difference Result 155 states and 166 transitions. [2021-11-23 03:30:18,902 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 03:30:18,902 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 17.333333333333332) internal successors, (104), 6 states have internal predecessors, (104), 2 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) Word has length 91 [2021-11-23 03:30:18,902 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:30:18,903 INFO L225 Difference]: With dead ends: 155 [2021-11-23 03:30:18,903 INFO L226 Difference]: Without dead ends: 96 [2021-11-23 03:30:18,904 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 361 GetRequests, 350 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=41, Invalid=115, Unknown=0, NotChecked=0, Total=156 [2021-11-23 03:30:18,905 INFO L933 BasicCegarLoop]: 93 mSDtfsCounter, 68 mSDsluCounter, 90 mSDsCounter, 0 mSdLazyCounter, 11 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 70 SdHoareTripleChecker+Valid, 183 SdHoareTripleChecker+Invalid, 18 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 11 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.8s IncrementalHoareTripleChecker+Time [2021-11-23 03:30:18,905 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [70 Valid, 183 Invalid, 18 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 11 Invalid, 0 Unknown, 0 Unchecked, 2.8s Time] [2021-11-23 03:30:18,906 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2021-11-23 03:30:18,918 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 96. [2021-11-23 03:30:18,919 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 96 states, 86 states have (on average 1.0930232558139534) internal successors, (94), 86 states have internal predecessors, (94), 5 states have call successors, (5), 5 states have call predecessors, (5), 4 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2021-11-23 03:30:18,919 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 96 states to 96 states and 103 transitions. [2021-11-23 03:30:18,920 INFO L78 Accepts]: Start accepts. Automaton has 96 states and 103 transitions. Word has length 91 [2021-11-23 03:30:18,920 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:30:18,920 INFO L470 AbstractCegarLoop]: Abstraction has 96 states and 103 transitions. [2021-11-23 03:30:18,921 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 17.333333333333332) internal successors, (104), 6 states have internal predecessors, (104), 2 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) [2021-11-23 03:30:18,921 INFO L276 IsEmpty]: Start isEmpty. Operand 96 states and 103 transitions. [2021-11-23 03:30:18,922 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 94 [2021-11-23 03:30:18,922 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:30:18,922 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:30:18,935 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (52)] Forceful destruction successful, exit code 0 [2021-11-23 03:30:19,148 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (51)] Forceful destruction successful, exit code 0 [2021-11-23 03:30:19,334 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 52 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt,51 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 [2021-11-23 03:30:19,334 INFO L402 AbstractCegarLoop]: === Iteration 29 === Targeting errorFnErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorFnErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:30:19,335 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:30:19,335 INFO L85 PathProgramCache]: Analyzing trace with hash -9328285, now seen corresponding path program 1 times [2021-11-23 03:30:19,336 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 03:30:19,336 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [810143561] [2021-11-23 03:30:19,336 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:30:19,336 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 03:30:19,336 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/mathsat [2021-11-23 03:30:19,337 INFO L229 MonitoredProcess]: Starting monitored process 53 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 03:30:19,339 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (53)] Waiting until timeout for monitored process [2021-11-23 03:30:19,745 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:30:19,782 INFO L263 TraceCheckSpWp]: Trace formula consists of 526 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 03:30:19,784 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:30:20,189 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-23 03:30:20,190 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:30:20,600 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-23 03:30:20,600 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 03:30:20,600 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [810143561] [2021-11-23 03:30:20,600 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [810143561] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:30:20,600 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1456027670] [2021-11-23 03:30:20,600 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:30:20,601 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 03:30:20,601 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/cvc4 [2021-11-23 03:30:20,612 INFO L229 MonitoredProcess]: Starting monitored process 54 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 03:30:20,613 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (54)] Waiting until timeout for monitored process [2021-11-23 03:30:21,218 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:30:21,247 INFO L263 TraceCheckSpWp]: Trace formula consists of 526 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 03:30:21,249 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:30:21,572 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-23 03:30:21,572 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:30:21,864 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-23 03:30:21,864 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1456027670] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:30:21,865 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [830285164] [2021-11-23 03:30:21,865 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:30:21,865 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:30:21,865 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:30:21,866 INFO L229 MonitoredProcess]: Starting monitored process 55 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:30:21,867 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (55)] Waiting until timeout for monitored process [2021-11-23 03:30:22,102 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:30:22,115 INFO L263 TraceCheckSpWp]: Trace formula consists of 526 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 03:30:22,117 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:30:22,664 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-23 03:30:22,664 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:30:23,098 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-23 03:30:23,098 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [830285164] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-23 03:30:23,098 INFO L186 FreeRefinementEngine]: Found 2 perfect and 4 imperfect interpolant sequences. [2021-11-23 03:30:23,099 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [5, 5, 5, 5] total 10 [2021-11-23 03:30:23,099 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1515177018] [2021-11-23 03:30:23,099 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-23 03:30:23,100 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 03:30:23,100 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 03:30:23,101 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 03:30:23,101 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=63, Unknown=0, NotChecked=0, Total=90 [2021-11-23 03:30:23,102 INFO L87 Difference]: Start difference. First operand 96 states and 103 transitions. Second operand has 4 states, 4 states have (on average 35.0) internal successors, (140), 4 states have internal predecessors, (140), 4 states have call successors, (9), 3 states have call predecessors, (9), 3 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) [2021-11-23 03:30:23,354 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:30:23,355 INFO L93 Difference]: Finished difference Result 186 states and 199 transitions. [2021-11-23 03:30:23,361 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 03:30:23,361 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 35.0) internal successors, (140), 4 states have internal predecessors, (140), 4 states have call successors, (9), 3 states have call predecessors, (9), 3 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) Word has length 93 [2021-11-23 03:30:23,361 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:30:23,362 INFO L225 Difference]: With dead ends: 186 [2021-11-23 03:30:23,362 INFO L226 Difference]: Without dead ends: 164 [2021-11-23 03:30:23,363 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 552 GetRequests, 544 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=27, Invalid=63, Unknown=0, NotChecked=0, Total=90 [2021-11-23 03:30:23,363 INFO L933 BasicCegarLoop]: 99 mSDtfsCounter, 22 mSDsluCounter, 182 mSDsCounter, 0 mSdLazyCounter, 10 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 22 SdHoareTripleChecker+Valid, 281 SdHoareTripleChecker+Invalid, 16 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 10 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 03:30:23,364 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [22 Valid, 281 Invalid, 16 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 10 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-23 03:30:23,364 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 164 states. [2021-11-23 03:30:23,398 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 164 to 162. [2021-11-23 03:30:23,398 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 162 states, 146 states have (on average 1.0890410958904109) internal successors, (159), 146 states have internal predecessors, (159), 8 states have call successors, (8), 8 states have call predecessors, (8), 7 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2021-11-23 03:30:23,399 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 162 states to 162 states and 174 transitions. [2021-11-23 03:30:23,400 INFO L78 Accepts]: Start accepts. Automaton has 162 states and 174 transitions. Word has length 93 [2021-11-23 03:30:23,400 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:30:23,400 INFO L470 AbstractCegarLoop]: Abstraction has 162 states and 174 transitions. [2021-11-23 03:30:23,400 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 35.0) internal successors, (140), 4 states have internal predecessors, (140), 4 states have call successors, (9), 3 states have call predecessors, (9), 3 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8) [2021-11-23 03:30:23,401 INFO L276 IsEmpty]: Start isEmpty. Operand 162 states and 174 transitions. [2021-11-23 03:30:23,401 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 94 [2021-11-23 03:30:23,401 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:30:23,402 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:30:23,419 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (53)] Forceful destruction successful, exit code 0 [2021-11-23 03:30:23,614 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (54)] Forceful destruction successful, exit code 0 [2021-11-23 03:30:23,835 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (55)] Forceful destruction successful, exit code 0 [2021-11-23 03:30:24,011 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 53 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3,54 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt,55 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:30:24,011 INFO L402 AbstractCegarLoop]: === Iteration 30 === Targeting errorFnErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorFnErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:30:24,011 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:30:24,011 INFO L85 PathProgramCache]: Analyzing trace with hash 209526433, now seen corresponding path program 1 times [2021-11-23 03:30:24,012 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 03:30:24,012 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [1779629625] [2021-11-23 03:30:24,012 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:30:24,012 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 03:30:24,012 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/mathsat [2021-11-23 03:30:24,013 INFO L229 MonitoredProcess]: Starting monitored process 56 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 03:30:24,014 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (56)] Waiting until timeout for monitored process [2021-11-23 03:30:24,400 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:30:24,429 INFO L263 TraceCheckSpWp]: Trace formula consists of 519 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 03:30:24,430 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:30:24,797 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-23 03:30:24,797 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:30:25,176 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-23 03:30:25,177 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 03:30:25,177 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [1779629625] [2021-11-23 03:30:25,177 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [1779629625] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:30:25,177 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1292506473] [2021-11-23 03:30:25,178 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:30:25,178 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 03:30:25,178 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/cvc4 [2021-11-23 03:30:25,179 INFO L229 MonitoredProcess]: Starting monitored process 57 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 03:30:25,180 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (57)] Waiting until timeout for monitored process [2021-11-23 03:30:25,750 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:30:25,774 INFO L263 TraceCheckSpWp]: Trace formula consists of 519 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 03:30:25,775 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:30:26,068 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-23 03:30:26,069 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:30:26,335 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-23 03:30:26,336 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1292506473] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:30:26,336 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1459270234] [2021-11-23 03:30:26,336 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:30:26,336 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:30:26,336 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:30:26,346 INFO L229 MonitoredProcess]: Starting monitored process 58 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:30:26,347 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (58)] Waiting until timeout for monitored process [2021-11-23 03:30:26,586 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:30:26,599 INFO L263 TraceCheckSpWp]: Trace formula consists of 519 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-23 03:30:26,600 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:30:27,090 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-23 03:30:27,090 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:30:27,634 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-23 03:30:27,635 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1459270234] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:30:27,635 INFO L186 FreeRefinementEngine]: Found 0 perfect and 6 imperfect interpolant sequences. [2021-11-23 03:30:27,635 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5, 5, 6, 6] total 16 [2021-11-23 03:30:27,635 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1178539170] [2021-11-23 03:30:27,635 INFO L85 oduleStraightlineAll]: Using 6 imperfect interpolants to construct interpolant automaton [2021-11-23 03:30:27,636 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-23 03:30:27,636 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy WALRUS [2021-11-23 03:30:27,636 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-23 03:30:27,637 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=54, Invalid=186, Unknown=0, NotChecked=0, Total=240 [2021-11-23 03:30:27,637 INFO L87 Difference]: Start difference. First operand 162 states and 174 transitions. Second operand has 16 states, 16 states have (on average 8.375) internal successors, (134), 16 states have internal predecessors, (134), 2 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) [2021-11-23 03:30:29,394 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.34s for a HTC check with result INVALID. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 03:30:31,406 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 03:30:33,421 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.02s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 03:30:35,434 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 03:30:37,446 WARN L534 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.01s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, BitVec], hasArrays=true, hasNonlinArith=false, quantifiers [] [2021-11-23 03:30:38,107 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:30:38,107 INFO L93 Difference]: Finished difference Result 316 states and 353 transitions. [2021-11-23 03:30:38,108 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-11-23 03:30:38,109 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 8.375) internal successors, (134), 16 states have internal predecessors, (134), 2 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) Word has length 93 [2021-11-23 03:30:38,109 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:30:38,110 INFO L225 Difference]: With dead ends: 316 [2021-11-23 03:30:38,110 INFO L226 Difference]: Without dead ends: 178 [2021-11-23 03:30:38,111 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 558 GetRequests, 538 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 60 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=110, Invalid=352, Unknown=0, NotChecked=0, Total=462 [2021-11-23 03:30:38,112 INFO L933 BasicCegarLoop]: 92 mSDtfsCounter, 130 mSDsluCounter, 623 mSDsCounter, 0 mSdLazyCounter, 75 mSolverCounterSat, 32 mSolverCounterUnsat, 4 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 9.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 130 SdHoareTripleChecker+Valid, 715 SdHoareTripleChecker+Invalid, 111 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 32 IncrementalHoareTripleChecker+Valid, 75 IncrementalHoareTripleChecker+Invalid, 4 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 9.8s IncrementalHoareTripleChecker+Time [2021-11-23 03:30:38,112 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [130 Valid, 715 Invalid, 111 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [32 Valid, 75 Invalid, 4 Unknown, 0 Unchecked, 9.8s Time] [2021-11-23 03:30:38,113 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 178 states. [2021-11-23 03:30:38,138 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 178 to 178. [2021-11-23 03:30:38,139 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 178 states, 162 states have (on average 1.0802469135802468) internal successors, (175), 162 states have internal predecessors, (175), 8 states have call successors, (8), 8 states have call predecessors, (8), 7 states have return successors, (7), 7 states have call predecessors, (7), 7 states have call successors, (7) [2021-11-23 03:30:38,140 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 178 states to 178 states and 190 transitions. [2021-11-23 03:30:38,140 INFO L78 Accepts]: Start accepts. Automaton has 178 states and 190 transitions. Word has length 93 [2021-11-23 03:30:38,141 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:30:38,141 INFO L470 AbstractCegarLoop]: Abstraction has 178 states and 190 transitions. [2021-11-23 03:30:38,141 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 8.375) internal successors, (134), 16 states have internal predecessors, (134), 2 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) [2021-11-23 03:30:38,141 INFO L276 IsEmpty]: Start isEmpty. Operand 178 states and 190 transitions. [2021-11-23 03:30:38,142 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 102 [2021-11-23 03:30:38,143 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:30:38,143 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:30:38,184 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (58)] Forceful destruction successful, exit code 0 [2021-11-23 03:30:38,379 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (56)] Ended with exit code 0 [2021-11-23 03:30:38,571 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (57)] Forceful destruction successful, exit code 0 [2021-11-23 03:30:38,767 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 58 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,56 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3,57 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt [2021-11-23 03:30:38,767 INFO L402 AbstractCegarLoop]: === Iteration 31 === Targeting errorFnErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorFnErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:30:38,767 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:30:38,767 INFO L85 PathProgramCache]: Analyzing trace with hash 1370778145, now seen corresponding path program 2 times [2021-11-23 03:30:38,768 INFO L121 FreeRefinementEngine]: Executing refinement strategy WALRUS [2021-11-23 03:30:38,768 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleMathsat [909857670] [2021-11-23 03:30:38,769 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-23 03:30:38,769 INFO L168 SolverBuilder]: Constructing external solver with command: mathsat -unsat_core_generation=3 [2021-11-23 03:30:38,769 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/mathsat [2021-11-23 03:30:38,770 INFO L229 MonitoredProcess]: Starting monitored process 59 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (exit command is (exit), workingDir is null) [2021-11-23 03:30:38,771 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/mathsat -unsat_core_generation=3 (59)] Waiting until timeout for monitored process [2021-11-23 03:30:41,082 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-23 03:30:41,082 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 03:30:41,132 INFO L263 TraceCheckSpWp]: Trace formula consists of 567 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 03:30:41,134 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:30:41,481 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2021-11-23 03:30:41,481 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:30:41,821 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2021-11-23 03:30:41,821 INFO L139 FreeRefinementEngine]: Strategy WALRUS found an infeasible trace [2021-11-23 03:30:41,821 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleMathsat [909857670] [2021-11-23 03:30:41,821 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleMathsat [909857670] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:30:41,821 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleCvc4 [1528076101] [2021-11-23 03:30:41,822 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-23 03:30:41,822 INFO L168 SolverBuilder]: Constructing external solver with command: cvc4 --incremental --print-success --lang smt [2021-11-23 03:30:41,822 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/cvc4 [2021-11-23 03:30:41,822 INFO L229 MonitoredProcess]: Starting monitored process 60 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (exit command is (exit), workingDir is null) [2021-11-23 03:30:41,823 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/cvc4 --incremental --print-success --lang smt (60)] Waiting until timeout for monitored process [2021-11-23 03:31:45,770 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST1 issued 2 check-sat command(s) [2021-11-23 03:31:45,770 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 03:31:45,916 INFO L263 TraceCheckSpWp]: Trace formula consists of 567 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 03:31:45,917 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:31:46,313 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2021-11-23 03:31:46,314 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:31:46,554 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2021-11-23 03:31:46,555 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleCvc4 [1528076101] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:31:46,555 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1964410440] [2021-11-23 03:31:46,555 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST1 [2021-11-23 03:31:46,555 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:31:46,555 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:31:46,557 INFO L229 MonitoredProcess]: Starting monitored process 61 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:31:46,558 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9ba96a22-8ddb-4c6a-a105-e503bb8811c4/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (61)] Waiting until timeout for monitored process