./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/array-cav19/array_init_both_ends_multiple_sum.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 53f42b1a Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_df824611-cb1d-4daa-8c21-3ee2f548ba3b/bin/utaipan-TEXQjIfE4P/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_df824611-cb1d-4daa-8c21-3ee2f548ba3b/bin/utaipan-TEXQjIfE4P/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_df824611-cb1d-4daa-8c21-3ee2f548ba3b/bin/utaipan-TEXQjIfE4P/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_df824611-cb1d-4daa-8c21-3ee2f548ba3b/bin/utaipan-TEXQjIfE4P/config/TaipanReach.xml -i ../../sv-benchmarks/c/array-cav19/array_init_both_ends_multiple_sum.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_df824611-cb1d-4daa-8c21-3ee2f548ba3b/bin/utaipan-TEXQjIfE4P/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_df824611-cb1d-4daa-8c21-3ee2f548ba3b/bin/utaipan-TEXQjIfE4P --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 54df2940ae4d13c219208dbc33c051105041923e87e99fc1d1620ede83e75392 --- Real Ultimate output --- This is Ultimate 0.2.1-dev-53f42b1 [2021-11-21 01:26:33,542 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-21 01:26:33,544 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-21 01:26:33,572 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-21 01:26:33,573 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-21 01:26:33,574 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-21 01:26:33,576 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-21 01:26:33,578 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-21 01:26:33,580 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-21 01:26:33,581 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-21 01:26:33,583 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-21 01:26:33,584 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-21 01:26:33,584 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-21 01:26:33,586 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-21 01:26:33,587 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-21 01:26:33,589 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-21 01:26:33,590 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-21 01:26:33,591 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-21 01:26:33,593 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-21 01:26:33,596 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-21 01:26:33,606 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-21 01:26:33,608 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-21 01:26:33,610 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-21 01:26:33,611 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-21 01:26:33,615 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-21 01:26:33,615 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-21 01:26:33,615 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-21 01:26:33,617 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-21 01:26:33,617 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-21 01:26:33,618 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-21 01:26:33,619 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-21 01:26:33,620 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-21 01:26:33,625 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-21 01:26:33,628 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-21 01:26:33,630 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-21 01:26:33,630 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-21 01:26:33,631 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-21 01:26:33,631 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-21 01:26:33,631 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-21 01:26:33,632 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-21 01:26:33,633 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-21 01:26:33,634 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_df824611-cb1d-4daa-8c21-3ee2f548ba3b/bin/utaipan-TEXQjIfE4P/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-21 01:26:33,677 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-21 01:26:33,678 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-21 01:26:33,678 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-21 01:26:33,678 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-21 01:26:33,679 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-21 01:26:33,679 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-21 01:26:33,679 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-21 01:26:33,679 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-21 01:26:33,680 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-21 01:26:33,680 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-21 01:26:33,680 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-21 01:26:33,685 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-21 01:26:33,685 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-21 01:26:33,685 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-21 01:26:33,686 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-21 01:26:33,686 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-21 01:26:33,686 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-21 01:26:33,686 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-21 01:26:33,687 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-21 01:26:33,687 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-21 01:26:33,687 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-21 01:26:33,687 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-21 01:26:33,688 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-21 01:26:33,688 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-21 01:26:33,688 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-21 01:26:33,689 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-21 01:26:33,689 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-21 01:26:33,689 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-21 01:26:33,690 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-21 01:26:33,690 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-21 01:26:33,690 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-21 01:26:33,690 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-21 01:26:33,691 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-21 01:26:33,691 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-21 01:26:33,691 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-21 01:26:33,691 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-21 01:26:33,692 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-21 01:26:33,692 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-21 01:26:33,693 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-21 01:26:33,693 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-21 01:26:33,693 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-21 01:26:33,693 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_df824611-cb1d-4daa-8c21-3ee2f548ba3b/bin/utaipan-TEXQjIfE4P/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_df824611-cb1d-4daa-8c21-3ee2f548ba3b/bin/utaipan-TEXQjIfE4P Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 54df2940ae4d13c219208dbc33c051105041923e87e99fc1d1620ede83e75392 [2021-11-21 01:26:33,962 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-21 01:26:33,999 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-21 01:26:34,001 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-21 01:26:34,002 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-21 01:26:34,004 INFO L275 PluginConnector]: CDTParser initialized [2021-11-21 01:26:34,005 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_df824611-cb1d-4daa-8c21-3ee2f548ba3b/bin/utaipan-TEXQjIfE4P/../../sv-benchmarks/c/array-cav19/array_init_both_ends_multiple_sum.c [2021-11-21 01:26:34,088 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_df824611-cb1d-4daa-8c21-3ee2f548ba3b/bin/utaipan-TEXQjIfE4P/data/ec606efe3/8019bc93c151407a97678fed65e8b88d/FLAGbceb800a9 [2021-11-21 01:26:34,491 INFO L306 CDTParser]: Found 1 translation units. [2021-11-21 01:26:34,492 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_df824611-cb1d-4daa-8c21-3ee2f548ba3b/sv-benchmarks/c/array-cav19/array_init_both_ends_multiple_sum.c [2021-11-21 01:26:34,497 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_df824611-cb1d-4daa-8c21-3ee2f548ba3b/bin/utaipan-TEXQjIfE4P/data/ec606efe3/8019bc93c151407a97678fed65e8b88d/FLAGbceb800a9 [2021-11-21 01:26:34,909 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_df824611-cb1d-4daa-8c21-3ee2f548ba3b/bin/utaipan-TEXQjIfE4P/data/ec606efe3/8019bc93c151407a97678fed65e8b88d [2021-11-21 01:26:34,912 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-21 01:26:34,913 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-21 01:26:34,915 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-21 01:26:34,915 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-21 01:26:34,918 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-21 01:26:34,919 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.11 01:26:34" (1/1) ... [2021-11-21 01:26:34,920 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@7fbd5132 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:26:34, skipping insertion in model container [2021-11-21 01:26:34,921 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.11 01:26:34" (1/1) ... [2021-11-21 01:26:34,928 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-21 01:26:34,941 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-21 01:26:35,143 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_df824611-cb1d-4daa-8c21-3ee2f548ba3b/sv-benchmarks/c/array-cav19/array_init_both_ends_multiple_sum.c[424,437] [2021-11-21 01:26:35,187 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-21 01:26:35,198 INFO L203 MainTranslator]: Completed pre-run [2021-11-21 01:26:35,220 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_df824611-cb1d-4daa-8c21-3ee2f548ba3b/sv-benchmarks/c/array-cav19/array_init_both_ends_multiple_sum.c[424,437] [2021-11-21 01:26:35,238 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-21 01:26:35,253 INFO L208 MainTranslator]: Completed translation [2021-11-21 01:26:35,254 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:26:35 WrapperNode [2021-11-21 01:26:35,254 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-21 01:26:35,255 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-21 01:26:35,256 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-21 01:26:35,256 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-21 01:26:35,263 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:26:35" (1/1) ... [2021-11-21 01:26:35,271 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:26:35" (1/1) ... [2021-11-21 01:26:35,292 INFO L137 Inliner]: procedures = 14, calls = 18, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 62 [2021-11-21 01:26:35,292 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-21 01:26:35,293 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-21 01:26:35,293 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-21 01:26:35,293 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-21 01:26:35,300 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:26:35" (1/1) ... [2021-11-21 01:26:35,301 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:26:35" (1/1) ... [2021-11-21 01:26:35,302 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:26:35" (1/1) ... [2021-11-21 01:26:35,303 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:26:35" (1/1) ... [2021-11-21 01:26:35,308 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:26:35" (1/1) ... [2021-11-21 01:26:35,311 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:26:35" (1/1) ... [2021-11-21 01:26:35,313 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:26:35" (1/1) ... [2021-11-21 01:26:35,315 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-21 01:26:35,315 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-21 01:26:35,316 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-21 01:26:35,316 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-21 01:26:35,317 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:26:35" (1/1) ... [2021-11-21 01:26:35,324 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-21 01:26:35,336 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_df824611-cb1d-4daa-8c21-3ee2f548ba3b/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:26:35,350 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_df824611-cb1d-4daa-8c21-3ee2f548ba3b/bin/utaipan-TEXQjIfE4P/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-21 01:26:35,382 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_df824611-cb1d-4daa-8c21-3ee2f548ba3b/bin/utaipan-TEXQjIfE4P/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-21 01:26:35,396 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-21 01:26:35,396 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-21 01:26:35,397 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-11-21 01:26:35,397 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-11-21 01:26:35,397 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-21 01:26:35,397 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-21 01:26:35,398 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-11-21 01:26:35,398 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-11-21 01:26:35,465 INFO L236 CfgBuilder]: Building ICFG [2021-11-21 01:26:35,467 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-21 01:26:35,574 INFO L277 CfgBuilder]: Performing block encoding [2021-11-21 01:26:35,601 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-21 01:26:35,602 INFO L301 CfgBuilder]: Removed 3 assume(true) statements. [2021-11-21 01:26:35,604 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.11 01:26:35 BoogieIcfgContainer [2021-11-21 01:26:35,604 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-21 01:26:35,606 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-21 01:26:35,606 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-21 01:26:35,626 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-21 01:26:35,627 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.11 01:26:34" (1/3) ... [2021-11-21 01:26:35,628 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@58f2cdc and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.11 01:26:35, skipping insertion in model container [2021-11-21 01:26:35,628 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:26:35" (2/3) ... [2021-11-21 01:26:35,628 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@58f2cdc and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.11 01:26:35, skipping insertion in model container [2021-11-21 01:26:35,628 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.11 01:26:35" (3/3) ... [2021-11-21 01:26:35,630 INFO L111 eAbstractionObserver]: Analyzing ICFG array_init_both_ends_multiple_sum.c [2021-11-21 01:26:35,640 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-21 01:26:35,640 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-21 01:26:35,698 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-21 01:26:35,705 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 [2021-11-21 01:26:35,706 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-21 01:26:35,718 INFO L276 IsEmpty]: Start isEmpty. Operand has 9 states, 7 states have (on average 1.7142857142857142) internal successors, (12), 8 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:26:35,723 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2021-11-21 01:26:35,723 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:26:35,724 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2021-11-21 01:26:35,729 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:26:35,734 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:26:35,748 INFO L85 PathProgramCache]: Analyzing trace with hash -1566730996, now seen corresponding path program 1 times [2021-11-21 01:26:35,757 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:26:35,758 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1675619771] [2021-11-21 01:26:35,758 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:26:35,759 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:26:35,863 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:26:35,932 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:26:35,933 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:26:35,933 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1675619771] [2021-11-21 01:26:35,934 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1675619771] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 01:26:35,935 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 01:26:35,935 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-21 01:26:35,936 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2123412324] [2021-11-21 01:26:35,937 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:26:35,946 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-21 01:26:35,946 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:26:35,978 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-21 01:26:35,979 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-21 01:26:35,981 INFO L87 Difference]: Start difference. First operand has 9 states, 7 states have (on average 1.7142857142857142) internal successors, (12), 8 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 3 states, 3 states have (on average 2.0) internal successors, (6), 2 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:26:36,030 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:26:36,030 INFO L93 Difference]: Finished difference Result 17 states and 23 transitions. [2021-11-21 01:26:36,031 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-21 01:26:36,033 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.0) internal successors, (6), 2 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 6 [2021-11-21 01:26:36,036 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:26:36,042 INFO L225 Difference]: With dead ends: 17 [2021-11-21 01:26:36,042 INFO L226 Difference]: Without dead ends: 8 [2021-11-21 01:26:36,045 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 [2021-11-21 01:26:36,049 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 0 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 15 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 6 SdHoareTripleChecker+Invalid, 15 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 15 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-21 01:26:36,050 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 6 Invalid, 15 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 15 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-21 01:26:36,064 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8 states. [2021-11-21 01:26:36,074 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8 to 8. [2021-11-21 01:26:36,075 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 8 states, 7 states have (on average 1.4285714285714286) internal successors, (10), 7 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:26:36,076 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8 states to 8 states and 10 transitions. [2021-11-21 01:26:36,077 INFO L78 Accepts]: Start accepts. Automaton has 8 states and 10 transitions. Word has length 6 [2021-11-21 01:26:36,077 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:26:36,077 INFO L470 AbstractCegarLoop]: Abstraction has 8 states and 10 transitions. [2021-11-21 01:26:36,078 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 2.0) internal successors, (6), 2 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:26:36,078 INFO L276 IsEmpty]: Start isEmpty. Operand 8 states and 10 transitions. [2021-11-21 01:26:36,078 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2021-11-21 01:26:36,078 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:26:36,079 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:26:36,079 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-21 01:26:36,079 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:26:36,080 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:26:36,080 INFO L85 PathProgramCache]: Analyzing trace with hash -1606658421, now seen corresponding path program 1 times [2021-11-21 01:26:36,081 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:26:36,081 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [736773780] [2021-11-21 01:26:36,081 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:26:36,082 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:26:36,100 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:26:36,170 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-21 01:26:36,170 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:26:36,170 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [736773780] [2021-11-21 01:26:36,171 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [736773780] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 01:26:36,171 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 01:26:36,171 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-21 01:26:36,171 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [891258651] [2021-11-21 01:26:36,172 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:26:36,173 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-21 01:26:36,174 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:26:36,175 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-21 01:26:36,175 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-21 01:26:36,175 INFO L87 Difference]: Start difference. First operand 8 states and 10 transitions. Second operand has 4 states, 4 states have (on average 1.75) internal successors, (7), 3 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:26:36,214 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:26:36,214 INFO L93 Difference]: Finished difference Result 14 states and 18 transitions. [2021-11-21 01:26:36,214 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-21 01:26:36,215 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 1.75) internal successors, (7), 3 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 7 [2021-11-21 01:26:36,215 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:26:36,215 INFO L225 Difference]: With dead ends: 14 [2021-11-21 01:26:36,216 INFO L226 Difference]: Without dead ends: 10 [2021-11-21 01:26:36,219 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-21 01:26:36,221 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 7 mSDsluCounter, 2 mSDsCounter, 0 mSdLazyCounter, 11 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 4 SdHoareTripleChecker+Invalid, 16 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 11 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-21 01:26:36,222 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [7 Valid, 4 Invalid, 16 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 11 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-21 01:26:36,223 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 10 states. [2021-11-21 01:26:36,225 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 10 to 10. [2021-11-21 01:26:36,225 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 10 states, 9 states have (on average 1.3333333333333333) internal successors, (12), 9 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:26:36,226 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 10 states to 10 states and 12 transitions. [2021-11-21 01:26:36,226 INFO L78 Accepts]: Start accepts. Automaton has 10 states and 12 transitions. Word has length 7 [2021-11-21 01:26:36,226 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:26:36,227 INFO L470 AbstractCegarLoop]: Abstraction has 10 states and 12 transitions. [2021-11-21 01:26:36,227 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 1.75) internal successors, (7), 3 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:26:36,227 INFO L276 IsEmpty]: Start isEmpty. Operand 10 states and 12 transitions. [2021-11-21 01:26:36,227 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2021-11-21 01:26:36,228 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:26:36,228 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:26:36,228 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-11-21 01:26:36,240 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:26:36,241 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:26:36,241 INFO L85 PathProgramCache]: Analyzing trace with hash 2073466838, now seen corresponding path program 1 times [2021-11-21 01:26:36,242 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:26:36,242 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1529374278] [2021-11-21 01:26:36,242 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:26:36,242 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:26:36,309 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:26:36,389 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-21 01:26:36,390 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:26:36,390 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1529374278] [2021-11-21 01:26:36,390 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1529374278] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:26:36,390 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [676852357] [2021-11-21 01:26:36,390 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:26:36,391 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:26:36,391 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_df824611-cb1d-4daa-8c21-3ee2f548ba3b/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:26:36,400 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_df824611-cb1d-4daa-8c21-3ee2f548ba3b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:26:36,400 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_df824611-cb1d-4daa-8c21-3ee2f548ba3b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-21 01:26:36,464 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:26:36,466 INFO L263 TraceCheckSpWp]: Trace formula consists of 72 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-21 01:26:36,470 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:26:36,578 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-21 01:26:36,578 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:26:36,641 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-21 01:26:36,641 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [676852357] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:26:36,642 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1042492657] [2021-11-21 01:26:36,671 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-21 01:26:36,680 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:26:36,685 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:26:36,691 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:26:36,691 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:26:36,835 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:26:36,836 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:26:36,908 INFO L354 Elim1Store]: treesize reduction 70, result has 31.4 percent of original size [2021-11-21 01:26:36,909 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 6 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 29 treesize of output 53 [2021-11-21 01:26:37,013 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:26:37,015 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:26:37,016 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:26:37,081 INFO L354 Elim1Store]: treesize reduction 98, result has 24.6 percent of original size [2021-11-21 01:26:37,081 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 6 select indices, 6 select index equivalence classes, 10 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 9 case distinctions, treesize of input 44 treesize of output 69 [2021-11-21 01:26:37,232 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:26:37,234 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2021-11-21 01:26:37,574 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:26:37,577 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:26:37,606 INFO L354 Elim1Store]: treesize reduction 66, result has 24.1 percent of original size [2021-11-21 01:26:37,607 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 263 treesize of output 266 [2021-11-21 01:26:38,023 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 14 [2021-11-21 01:26:38,142 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-21 01:26:38,261 INFO L354 Elim1Store]: treesize reduction 42, result has 30.0 percent of original size [2021-11-21 01:26:38,262 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 41 treesize of output 46 [2021-11-21 01:26:38,357 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 16 [2021-11-21 01:26:38,790 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:26:38,939 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:26:38,939 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:26:38,940 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3, 3] total 7 [2021-11-21 01:26:38,940 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [163960641] [2021-11-21 01:26:38,940 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:26:38,940 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-21 01:26:38,941 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:26:38,941 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-21 01:26:38,941 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=40, Invalid=92, Unknown=0, NotChecked=0, Total=132 [2021-11-21 01:26:38,942 INFO L87 Difference]: Start difference. First operand 10 states and 12 transitions. Second operand has 8 states, 8 states have (on average 1.875) internal successors, (15), 7 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:26:38,978 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:26:38,979 INFO L93 Difference]: Finished difference Result 20 states and 26 transitions. [2021-11-21 01:26:38,979 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-21 01:26:38,979 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 1.875) internal successors, (15), 7 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 9 [2021-11-21 01:26:38,979 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:26:38,980 INFO L225 Difference]: With dead ends: 20 [2021-11-21 01:26:38,980 INFO L226 Difference]: Without dead ends: 13 [2021-11-21 01:26:38,981 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 18 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 41 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=40, Invalid=92, Unknown=0, NotChecked=0, Total=132 [2021-11-21 01:26:38,982 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 0 mSDsluCounter, 8 mSDsCounter, 0 mSdLazyCounter, 32 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 10 SdHoareTripleChecker+Invalid, 35 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 32 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-21 01:26:38,982 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 10 Invalid, 35 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 32 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-21 01:26:38,983 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2021-11-21 01:26:38,985 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2021-11-21 01:26:38,986 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 13 states, 12 states have (on average 1.25) internal successors, (15), 12 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:26:38,986 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 15 transitions. [2021-11-21 01:26:38,986 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 15 transitions. Word has length 9 [2021-11-21 01:26:38,986 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:26:38,987 INFO L470 AbstractCegarLoop]: Abstraction has 13 states and 15 transitions. [2021-11-21 01:26:38,987 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 1.875) internal successors, (15), 7 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:26:38,987 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 15 transitions. [2021-11-21 01:26:38,987 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-11-21 01:26:38,987 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:26:38,988 INFO L514 BasicCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:26:39,029 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_df824611-cb1d-4daa-8c21-3ee2f548ba3b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-21 01:26:39,200 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_df824611-cb1d-4daa-8c21-3ee2f548ba3b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:26:39,201 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:26:39,201 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:26:39,202 INFO L85 PathProgramCache]: Analyzing trace with hash 866857431, now seen corresponding path program 2 times [2021-11-21 01:26:39,202 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:26:39,202 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [717846527] [2021-11-21 01:26:39,202 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:26:39,202 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:26:39,221 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:26:39,271 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-21 01:26:39,272 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:26:39,272 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [717846527] [2021-11-21 01:26:39,272 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [717846527] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:26:39,272 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [717499418] [2021-11-21 01:26:39,272 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 01:26:39,272 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:26:39,273 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_df824611-cb1d-4daa-8c21-3ee2f548ba3b/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:26:39,273 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_df824611-cb1d-4daa-8c21-3ee2f548ba3b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:26:39,300 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_df824611-cb1d-4daa-8c21-3ee2f548ba3b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-21 01:26:39,324 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-11-21 01:26:39,324 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:26:39,325 INFO L263 TraceCheckSpWp]: Trace formula consists of 76 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-21 01:26:39,327 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:26:39,399 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-21 01:26:39,400 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:26:39,460 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-21 01:26:39,460 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [717499418] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:26:39,460 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [139779716] [2021-11-21 01:26:39,464 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-21 01:26:39,464 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:26:39,465 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:26:39,465 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:26:39,465 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:26:39,511 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:26:39,513 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:26:39,515 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:26:39,518 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:26:39,584 INFO L354 Elim1Store]: treesize reduction 98, result has 24.6 percent of original size [2021-11-21 01:26:39,584 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 6 select indices, 6 select index equivalence classes, 10 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 9 case distinctions, treesize of input 44 treesize of output 69 [2021-11-21 01:26:39,630 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:26:39,636 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:26:39,637 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 10 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 29 treesize of output 39 [2021-11-21 01:26:39,724 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:26:39,726 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2021-11-21 01:26:39,863 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:26:39,864 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:26:39,892 INFO L354 Elim1Store]: treesize reduction 66, result has 24.1 percent of original size [2021-11-21 01:26:39,893 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 263 treesize of output 266 [2021-11-21 01:26:40,344 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 14 [2021-11-21 01:26:40,449 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-21 01:26:40,510 INFO L354 Elim1Store]: treesize reduction 42, result has 30.0 percent of original size [2021-11-21 01:26:40,511 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 41 treesize of output 46 [2021-11-21 01:26:40,594 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 16 [2021-11-21 01:26:40,990 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:26:41,154 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:26:41,155 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:26:41,155 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 4, 4] total 12 [2021-11-21 01:26:41,155 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1805509872] [2021-11-21 01:26:41,155 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:26:41,155 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2021-11-21 01:26:41,156 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:26:41,156 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-11-21 01:26:41,157 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=86, Invalid=186, Unknown=0, NotChecked=0, Total=272 [2021-11-21 01:26:41,157 INFO L87 Difference]: Start difference. First operand 13 states and 15 transitions. Second operand has 13 states, 13 states have (on average 1.6923076923076923) internal successors, (22), 12 states have internal predecessors, (22), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:26:41,308 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:26:41,308 INFO L93 Difference]: Finished difference Result 35 states and 53 transitions. [2021-11-21 01:26:41,309 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-11-21 01:26:41,309 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 1.6923076923076923) internal successors, (22), 12 states have internal predecessors, (22), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 12 [2021-11-21 01:26:41,309 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:26:41,310 INFO L225 Difference]: With dead ends: 35 [2021-11-21 01:26:41,310 INFO L226 Difference]: Without dead ends: 28 [2021-11-21 01:26:41,310 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 25 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 115 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=146, Invalid=316, Unknown=0, NotChecked=0, Total=462 [2021-11-21 01:26:41,311 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 10 mSDsluCounter, 6 mSDsCounter, 0 mSdLazyCounter, 34 mSolverCounterSat, 71 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 8 SdHoareTripleChecker+Invalid, 105 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 71 IncrementalHoareTripleChecker+Valid, 34 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 01:26:41,312 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [10 Valid, 8 Invalid, 105 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [71 Valid, 34 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 01:26:41,313 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2021-11-21 01:26:41,316 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2021-11-21 01:26:41,317 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28 states, 27 states have (on average 1.1111111111111112) internal successors, (30), 27 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:26:41,328 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 30 transitions. [2021-11-21 01:26:41,328 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 30 transitions. Word has length 12 [2021-11-21 01:26:41,328 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:26:41,328 INFO L470 AbstractCegarLoop]: Abstraction has 28 states and 30 transitions. [2021-11-21 01:26:41,329 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 1.6923076923076923) internal successors, (22), 12 states have internal predecessors, (22), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:26:41,329 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 30 transitions. [2021-11-21 01:26:41,329 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2021-11-21 01:26:41,329 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:26:41,330 INFO L514 BasicCegarLoop]: trace histogram [7, 7, 7, 1, 1, 1, 1, 1, 1] [2021-11-21 01:26:41,367 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_df824611-cb1d-4daa-8c21-3ee2f548ba3b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-21 01:26:41,544 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_df824611-cb1d-4daa-8c21-3ee2f548ba3b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:26:41,545 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:26:41,546 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:26:41,546 INFO L85 PathProgramCache]: Analyzing trace with hash -65596586, now seen corresponding path program 3 times [2021-11-21 01:26:41,546 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:26:41,546 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1684101870] [2021-11-21 01:26:41,546 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:26:41,546 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:26:41,605 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:26:41,720 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 56 trivial. 0 not checked. [2021-11-21 01:26:41,721 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:26:41,721 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1684101870] [2021-11-21 01:26:41,721 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1684101870] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:26:41,721 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [499316076] [2021-11-21 01:26:41,721 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-21 01:26:41,722 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:26:41,722 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_df824611-cb1d-4daa-8c21-3ee2f548ba3b/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:26:41,723 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_df824611-cb1d-4daa-8c21-3ee2f548ba3b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:26:41,748 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_df824611-cb1d-4daa-8c21-3ee2f548ba3b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-21 01:26:41,903 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-21 01:26:41,904 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:26:41,905 INFO L263 TraceCheckSpWp]: Trace formula consists of 150 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-21 01:26:41,907 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:26:42,058 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 56 trivial. 0 not checked. [2021-11-21 01:26:42,059 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:26:42,228 INFO L134 CoverageAnalysis]: Checked inductivity of 84 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 56 trivial. 0 not checked. [2021-11-21 01:26:42,228 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [499316076] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:26:42,228 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1023188580] [2021-11-21 01:26:42,231 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-21 01:26:42,231 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:26:42,231 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:26:42,231 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:26:42,231 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:26:42,266 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:26:42,267 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:26:42,313 INFO L354 Elim1Store]: treesize reduction 70, result has 31.4 percent of original size [2021-11-21 01:26:42,313 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 6 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 29 treesize of output 53 [2021-11-21 01:26:42,364 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:26:42,366 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:26:42,368 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:26:42,370 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:26:42,426 INFO L354 Elim1Store]: treesize reduction 98, result has 24.6 percent of original size [2021-11-21 01:26:42,427 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 6 select indices, 6 select index equivalence classes, 10 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 9 case distinctions, treesize of input 44 treesize of output 69 [2021-11-21 01:26:42,523 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:26:42,525 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 33 treesize of output 35 [2021-11-21 01:26:42,687 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:26:42,690 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:26:42,691 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:26:42,706 INFO L354 Elim1Store]: treesize reduction 54, result has 11.5 percent of original size [2021-11-21 01:26:42,706 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 272 treesize of output 269 [2021-11-21 01:26:42,966 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 14 [2021-11-21 01:26:43,035 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 16 [2021-11-21 01:26:43,114 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:26:43,116 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 46 treesize of output 45 [2021-11-21 01:26:43,219 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 16 [2021-11-21 01:26:43,589 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:26:43,734 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:26:43,734 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:26:43,734 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 25 [2021-11-21 01:26:43,734 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [933835725] [2021-11-21 01:26:43,734 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:26:43,735 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2021-11-21 01:26:43,735 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:26:43,735 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-11-21 01:26:43,736 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=316, Invalid=554, Unknown=0, NotChecked=0, Total=870 [2021-11-21 01:26:43,736 INFO L87 Difference]: Start difference. First operand 28 states and 30 transitions. Second operand has 26 states, 26 states have (on average 1.2692307692307692) internal successors, (33), 25 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:26:43,786 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:26:43,787 INFO L93 Difference]: Finished difference Result 56 states and 68 transitions. [2021-11-21 01:26:43,787 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-11-21 01:26:43,787 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 1.2692307692307692) internal successors, (33), 25 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 27 [2021-11-21 01:26:43,788 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:26:43,788 INFO L225 Difference]: With dead ends: 56 [2021-11-21 01:26:43,788 INFO L226 Difference]: Without dead ends: 37 [2021-11-21 01:26:43,789 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 88 GetRequests, 60 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 383 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=316, Invalid=554, Unknown=0, NotChecked=0, Total=870 [2021-11-21 01:26:43,790 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 0 mSDsluCounter, 6 mSDsCounter, 0 mSdLazyCounter, 42 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 8 SdHoareTripleChecker+Invalid, 52 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 42 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-21 01:26:43,791 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 8 Invalid, 52 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 42 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-21 01:26:43,791 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2021-11-21 01:26:43,796 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2021-11-21 01:26:43,796 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 37 states, 36 states have (on average 1.0833333333333333) internal successors, (39), 36 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:26:43,797 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 39 transitions. [2021-11-21 01:26:43,797 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 39 transitions. Word has length 27 [2021-11-21 01:26:43,797 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:26:43,797 INFO L470 AbstractCegarLoop]: Abstraction has 37 states and 39 transitions. [2021-11-21 01:26:43,798 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 26 states have (on average 1.2692307692307692) internal successors, (33), 25 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:26:43,798 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 39 transitions. [2021-11-21 01:26:43,799 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2021-11-21 01:26:43,799 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:26:43,799 INFO L514 BasicCegarLoop]: trace histogram [16, 7, 7, 1, 1, 1, 1, 1, 1] [2021-11-21 01:26:43,823 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_df824611-cb1d-4daa-8c21-3ee2f548ba3b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-21 01:26:44,004 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_df824611-cb1d-4daa-8c21-3ee2f548ba3b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:26:44,005 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:26:44,005 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:26:44,005 INFO L85 PathProgramCache]: Analyzing trace with hash -948971849, now seen corresponding path program 4 times [2021-11-21 01:26:44,006 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:26:44,006 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [226341540] [2021-11-21 01:26:44,006 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:26:44,006 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:26:44,042 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:26:44,248 INFO L134 CoverageAnalysis]: Checked inductivity of 192 backedges. 0 proven. 136 refuted. 0 times theorem prover too weak. 56 trivial. 0 not checked. [2021-11-21 01:26:44,248 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:26:44,248 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [226341540] [2021-11-21 01:26:44,248 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [226341540] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:26:44,248 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [790930013] [2021-11-21 01:26:44,248 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-21 01:26:44,249 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:26:44,249 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_df824611-cb1d-4daa-8c21-3ee2f548ba3b/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:26:44,249 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_df824611-cb1d-4daa-8c21-3ee2f548ba3b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:26:44,254 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_df824611-cb1d-4daa-8c21-3ee2f548ba3b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-21 01:26:44,311 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:26:44,313 INFO L263 TraceCheckSpWp]: Trace formula consists of 186 conjuncts, 19 conjunts are in the unsatisfiable core [2021-11-21 01:26:44,315 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:26:44,620 INFO L134 CoverageAnalysis]: Checked inductivity of 192 backedges. 0 proven. 136 refuted. 0 times theorem prover too weak. 56 trivial. 0 not checked. [2021-11-21 01:26:44,620 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:26:45,095 INFO L134 CoverageAnalysis]: Checked inductivity of 192 backedges. 0 proven. 136 refuted. 0 times theorem prover too weak. 56 trivial. 0 not checked. [2021-11-21 01:26:45,095 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [790930013] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:26:45,096 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [680278560] [2021-11-21 01:26:45,097 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-21 01:26:45,098 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:26:45,098 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:26:45,098 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:26:45,098 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:26:45,126 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:26:45,127 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:26:45,173 INFO L354 Elim1Store]: treesize reduction 70, result has 31.4 percent of original size [2021-11-21 01:26:45,174 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 6 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 29 treesize of output 53 [2021-11-21 01:26:45,216 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:26:45,217 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:26:45,218 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:26:45,264 INFO L354 Elim1Store]: treesize reduction 98, result has 24.6 percent of original size [2021-11-21 01:26:45,265 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 6 select indices, 6 select index equivalence classes, 10 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 9 case distinctions, treesize of input 44 treesize of output 69 [2021-11-21 01:26:45,341 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:26:45,342 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2021-11-21 01:26:45,451 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:26:45,452 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:26:45,473 INFO L354 Elim1Store]: treesize reduction 66, result has 24.1 percent of original size [2021-11-21 01:26:45,473 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 263 treesize of output 266 [2021-11-21 01:26:45,796 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 14 [2021-11-21 01:26:45,896 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 16 [2021-11-21 01:26:45,969 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:26:45,970 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 46 treesize of output 45 [2021-11-21 01:26:46,039 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 16 [2021-11-21 01:26:46,358 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:26:46,504 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:26:46,505 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:26:46,505 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 18] total 52 [2021-11-21 01:26:46,505 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1065154925] [2021-11-21 01:26:46,505 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:26:46,506 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 53 states [2021-11-21 01:26:46,506 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:26:46,507 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2021-11-21 01:26:46,509 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1270, Invalid=1922, Unknown=0, NotChecked=0, Total=3192 [2021-11-21 01:26:46,509 INFO L87 Difference]: Start difference. First operand 37 states and 39 transitions. Second operand has 53 states, 53 states have (on average 1.1320754716981132) internal successors, (60), 52 states have internal predecessors, (60), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:26:46,600 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:26:46,600 INFO L93 Difference]: Finished difference Result 74 states and 95 transitions. [2021-11-21 01:26:46,600 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2021-11-21 01:26:46,601 INFO L78 Accepts]: Start accepts. Automaton has has 53 states, 53 states have (on average 1.1320754716981132) internal successors, (60), 52 states have internal predecessors, (60), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 36 [2021-11-21 01:26:46,601 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:26:46,602 INFO L225 Difference]: With dead ends: 74 [2021-11-21 01:26:46,602 INFO L226 Difference]: Without dead ends: 55 [2021-11-21 01:26:46,603 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 124 GetRequests, 69 SyntacticMatches, 0 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1436 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=1270, Invalid=1922, Unknown=0, NotChecked=0, Total=3192 [2021-11-21 01:26:46,604 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 0 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 58 mSolverCounterSat, 21 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 6 SdHoareTripleChecker+Invalid, 79 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 21 IncrementalHoareTripleChecker+Valid, 58 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 01:26:46,605 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 6 Invalid, 79 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [21 Valid, 58 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 01:26:46,606 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2021-11-21 01:26:46,612 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 55. [2021-11-21 01:26:46,612 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 55 states, 54 states have (on average 1.0555555555555556) internal successors, (57), 54 states have internal predecessors, (57), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:26:46,613 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 57 transitions. [2021-11-21 01:26:46,614 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 57 transitions. Word has length 36 [2021-11-21 01:26:46,614 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:26:46,614 INFO L470 AbstractCegarLoop]: Abstraction has 55 states and 57 transitions. [2021-11-21 01:26:46,614 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 53 states, 53 states have (on average 1.1320754716981132) internal successors, (60), 52 states have internal predecessors, (60), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:26:46,615 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 57 transitions. [2021-11-21 01:26:46,616 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2021-11-21 01:26:46,616 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:26:46,616 INFO L514 BasicCegarLoop]: trace histogram [34, 7, 7, 1, 1, 1, 1, 1, 1] [2021-11-21 01:26:46,654 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_df824611-cb1d-4daa-8c21-3ee2f548ba3b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-21 01:26:46,844 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_df824611-cb1d-4daa-8c21-3ee2f548ba3b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:26:46,845 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:26:46,845 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:26:46,845 INFO L85 PathProgramCache]: Analyzing trace with hash 460545431, now seen corresponding path program 5 times [2021-11-21 01:26:46,845 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:26:46,845 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [266782144] [2021-11-21 01:26:46,845 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:26:46,845 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:26:46,944 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:26:47,636 INFO L134 CoverageAnalysis]: Checked inductivity of 651 backedges. 0 proven. 595 refuted. 0 times theorem prover too weak. 56 trivial. 0 not checked. [2021-11-21 01:26:47,636 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:26:47,636 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [266782144] [2021-11-21 01:26:47,637 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [266782144] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:26:47,637 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [803963138] [2021-11-21 01:26:47,637 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 01:26:47,637 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:26:47,637 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_df824611-cb1d-4daa-8c21-3ee2f548ba3b/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:26:47,638 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_df824611-cb1d-4daa-8c21-3ee2f548ba3b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:26:47,639 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_df824611-cb1d-4daa-8c21-3ee2f548ba3b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-21 01:26:47,817 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2021-11-21 01:26:47,817 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:26:47,819 INFO L263 TraceCheckSpWp]: Trace formula consists of 154 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-21 01:26:47,821 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:26:48,034 INFO L134 CoverageAnalysis]: Checked inductivity of 651 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 623 trivial. 0 not checked. [2021-11-21 01:26:48,034 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:26:48,432 INFO L134 CoverageAnalysis]: Checked inductivity of 651 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 623 trivial. 0 not checked. [2021-11-21 01:26:48,432 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [803963138] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:26:48,432 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [816831123] [2021-11-21 01:26:48,434 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-21 01:26:48,434 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:26:48,435 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:26:48,435 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:26:48,435 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:26:48,466 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:26:48,471 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:26:48,475 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:26:48,531 INFO L354 Elim1Store]: treesize reduction 98, result has 24.6 percent of original size [2021-11-21 01:26:48,531 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 6 select indices, 6 select index equivalence classes, 10 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 9 case distinctions, treesize of input 44 treesize of output 69 [2021-11-21 01:26:48,585 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:26:48,586 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:26:48,587 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 10 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 29 treesize of output 39 [2021-11-21 01:26:48,641 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:26:48,642 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2021-11-21 01:26:48,743 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:26:48,743 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:26:48,771 INFO L354 Elim1Store]: treesize reduction 66, result has 24.1 percent of original size [2021-11-21 01:26:48,772 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 263 treesize of output 266 [2021-11-21 01:26:49,036 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 14 [2021-11-21 01:26:49,127 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-21 01:26:49,182 INFO L354 Elim1Store]: treesize reduction 42, result has 30.0 percent of original size [2021-11-21 01:26:49,184 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 41 treesize of output 46 [2021-11-21 01:26:49,275 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 16 [2021-11-21 01:26:49,648 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:26:49,895 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:26:49,896 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:26:49,896 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 10, 10] total 54 [2021-11-21 01:26:49,896 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [481312081] [2021-11-21 01:26:49,896 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:26:49,897 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 55 states [2021-11-21 01:26:49,897 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:26:49,898 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2021-11-21 01:26:49,899 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1400, Invalid=2022, Unknown=0, NotChecked=0, Total=3422 [2021-11-21 01:26:49,899 INFO L87 Difference]: Start difference. First operand 55 states and 57 transitions. Second operand has 55 states, 55 states have (on average 1.1636363636363636) internal successors, (64), 54 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:26:51,310 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:26:51,310 INFO L93 Difference]: Finished difference Result 155 states and 239 transitions. [2021-11-21 01:26:51,310 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2021-11-21 01:26:51,311 INFO L78 Accepts]: Start accepts. Automaton has has 55 states, 55 states have (on average 1.1636363636363636) internal successors, (64), 54 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 54 [2021-11-21 01:26:51,311 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:26:51,313 INFO L225 Difference]: With dead ends: 155 [2021-11-21 01:26:51,313 INFO L226 Difference]: Without dead ends: 136 [2021-11-21 01:26:51,316 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 231 GetRequests, 139 SyntacticMatches, 0 SemanticMatches, 92 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1963 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=3080, Invalid=5662, Unknown=0, NotChecked=0, Total=8742 [2021-11-21 01:26:51,317 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 10 mSDsluCounter, 6 mSDsCounter, 0 mSdLazyCounter, 145 mSolverCounterSat, 575 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 8 SdHoareTripleChecker+Invalid, 720 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 575 IncrementalHoareTripleChecker+Valid, 145 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-21 01:26:51,317 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [10 Valid, 8 Invalid, 720 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [575 Valid, 145 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-21 01:26:51,318 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 136 states. [2021-11-21 01:26:51,332 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 136 to 136. [2021-11-21 01:26:51,333 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 136 states, 135 states have (on average 1.0222222222222221) internal successors, (138), 135 states have internal predecessors, (138), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:26:51,334 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 136 states to 136 states and 138 transitions. [2021-11-21 01:26:51,335 INFO L78 Accepts]: Start accepts. Automaton has 136 states and 138 transitions. Word has length 54 [2021-11-21 01:26:51,335 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:26:51,335 INFO L470 AbstractCegarLoop]: Abstraction has 136 states and 138 transitions. [2021-11-21 01:26:51,335 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 55 states, 55 states have (on average 1.1636363636363636) internal successors, (64), 54 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:26:51,335 INFO L276 IsEmpty]: Start isEmpty. Operand 136 states and 138 transitions. [2021-11-21 01:26:51,341 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 136 [2021-11-21 01:26:51,341 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:26:51,342 INFO L514 BasicCegarLoop]: trace histogram [43, 43, 43, 1, 1, 1, 1, 1, 1] [2021-11-21 01:26:51,379 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_df824611-cb1d-4daa-8c21-3ee2f548ba3b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-21 01:26:51,568 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_df824611-cb1d-4daa-8c21-3ee2f548ba3b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:26:51,569 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:26:51,569 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:26:51,569 INFO L85 PathProgramCache]: Analyzing trace with hash 1567950934, now seen corresponding path program 6 times [2021-11-21 01:26:51,569 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:26:51,569 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1454462336] [2021-11-21 01:26:51,569 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:26:51,569 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:26:51,641 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:26:52,464 INFO L134 CoverageAnalysis]: Checked inductivity of 2838 backedges. 0 proven. 946 refuted. 0 times theorem prover too weak. 1892 trivial. 0 not checked. [2021-11-21 01:26:52,464 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:26:52,464 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1454462336] [2021-11-21 01:26:52,464 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1454462336] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:26:52,464 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1477653889] [2021-11-21 01:26:52,464 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-21 01:26:52,464 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:26:52,465 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_df824611-cb1d-4daa-8c21-3ee2f548ba3b/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:26:52,465 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_df824611-cb1d-4daa-8c21-3ee2f548ba3b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:26:52,469 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_df824611-cb1d-4daa-8c21-3ee2f548ba3b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process