./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/loop-crafted/simple_array_index_value_3.i --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_06079599-17ab-4975-a7ec-0159b1d93e6b/bin/utaipan-TEXQjIfE4P/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06079599-17ab-4975-a7ec-0159b1d93e6b/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_06079599-17ab-4975-a7ec-0159b1d93e6b/bin/utaipan-TEXQjIfE4P/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06079599-17ab-4975-a7ec-0159b1d93e6b/bin/utaipan-TEXQjIfE4P/config/TaipanReach.xml -i ../../sv-benchmarks/c/loop-crafted/simple_array_index_value_3.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06079599-17ab-4975-a7ec-0159b1d93e6b/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_06079599-17ab-4975-a7ec-0159b1d93e6b/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 8ce03462fe975a31ea60daf5f1377957a781bf3e81bf898be84185f681a4ed0e --- Real Ultimate output --- This is Ultimate 0.2.1-dev-53f42b1 [2021-11-21 01:28:41,542 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-21 01:28:41,545 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-21 01:28:41,581 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-21 01:28:41,582 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-21 01:28:41,584 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-21 01:28:41,587 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-21 01:28:41,590 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-21 01:28:41,592 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-21 01:28:41,594 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-21 01:28:41,596 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-21 01:28:41,597 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-21 01:28:41,598 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-21 01:28:41,600 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-21 01:28:41,602 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-21 01:28:41,604 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-21 01:28:41,606 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-21 01:28:41,607 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-21 01:28:41,611 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-21 01:28:41,614 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-21 01:28:41,617 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-21 01:28:41,618 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-21 01:28:41,620 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-21 01:28:41,622 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-21 01:28:41,626 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-21 01:28:41,627 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-21 01:28:41,627 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-21 01:28:41,629 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-21 01:28:41,630 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-21 01:28:41,631 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-21 01:28:41,632 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-21 01:28:41,634 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-21 01:28:41,635 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-21 01:28:41,637 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-21 01:28:41,638 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-21 01:28:41,639 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-21 01:28:41,640 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-21 01:28:41,641 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-21 01:28:41,641 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-21 01:28:41,643 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-21 01:28:41,644 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-21 01:28:41,645 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06079599-17ab-4975-a7ec-0159b1d93e6b/bin/utaipan-TEXQjIfE4P/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-21 01:28:41,698 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-21 01:28:41,699 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-21 01:28:41,700 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-21 01:28:41,701 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-21 01:28:41,702 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-21 01:28:41,703 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-21 01:28:41,703 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-21 01:28:41,704 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-21 01:28:41,704 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-21 01:28:41,704 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-21 01:28:41,706 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-21 01:28:41,706 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-21 01:28:41,707 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-21 01:28:41,707 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-21 01:28:41,707 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-21 01:28:41,708 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-21 01:28:41,708 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-21 01:28:41,708 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-21 01:28:41,709 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-21 01:28:41,710 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-21 01:28:41,710 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-21 01:28:41,711 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-21 01:28:41,711 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-21 01:28:41,711 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-21 01:28:41,712 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-21 01:28:41,712 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-21 01:28:41,714 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-21 01:28:41,714 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-21 01:28:41,715 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-21 01:28:41,715 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-21 01:28:41,716 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-21 01:28:41,716 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-21 01:28:41,716 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-21 01:28:41,717 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-21 01:28:41,717 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-21 01:28:41,718 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-21 01:28:41,718 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-21 01:28:41,718 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-21 01:28:41,719 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-21 01:28:41,719 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-21 01:28:41,719 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-21 01:28:41,720 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_06079599-17ab-4975-a7ec-0159b1d93e6b/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06079599-17ab-4975-a7ec-0159b1d93e6b/bin/utaipan-TEXQjIfE4P Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 8ce03462fe975a31ea60daf5f1377957a781bf3e81bf898be84185f681a4ed0e [2021-11-21 01:28:42,064 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-21 01:28:42,100 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-21 01:28:42,104 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-21 01:28:42,105 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-21 01:28:42,107 INFO L275 PluginConnector]: CDTParser initialized [2021-11-21 01:28:42,109 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06079599-17ab-4975-a7ec-0159b1d93e6b/bin/utaipan-TEXQjIfE4P/../../sv-benchmarks/c/loop-crafted/simple_array_index_value_3.i [2021-11-21 01:28:42,202 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06079599-17ab-4975-a7ec-0159b1d93e6b/bin/utaipan-TEXQjIfE4P/data/9970445ab/bd6743486a744fd084d8186282f95bad/FLAG347d8a05f [2021-11-21 01:28:42,839 INFO L306 CDTParser]: Found 1 translation units. [2021-11-21 01:28:42,840 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06079599-17ab-4975-a7ec-0159b1d93e6b/sv-benchmarks/c/loop-crafted/simple_array_index_value_3.i [2021-11-21 01:28:42,847 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06079599-17ab-4975-a7ec-0159b1d93e6b/bin/utaipan-TEXQjIfE4P/data/9970445ab/bd6743486a744fd084d8186282f95bad/FLAG347d8a05f [2021-11-21 01:28:43,188 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06079599-17ab-4975-a7ec-0159b1d93e6b/bin/utaipan-TEXQjIfE4P/data/9970445ab/bd6743486a744fd084d8186282f95bad [2021-11-21 01:28:43,191 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-21 01:28:43,193 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-21 01:28:43,199 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-21 01:28:43,199 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-21 01:28:43,203 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-21 01:28:43,204 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.11 01:28:43" (1/1) ... [2021-11-21 01:28:43,206 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@76553089 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:28:43, skipping insertion in model container [2021-11-21 01:28:43,207 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.11 01:28:43" (1/1) ... [2021-11-21 01:28:43,218 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-21 01:28:43,241 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-21 01:28:43,459 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_06079599-17ab-4975-a7ec-0159b1d93e6b/sv-benchmarks/c/loop-crafted/simple_array_index_value_3.i[920,933] [2021-11-21 01:28:43,475 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-21 01:28:43,484 INFO L203 MainTranslator]: Completed pre-run [2021-11-21 01:28:43,500 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_06079599-17ab-4975-a7ec-0159b1d93e6b/sv-benchmarks/c/loop-crafted/simple_array_index_value_3.i[920,933] [2021-11-21 01:28:43,507 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-21 01:28:43,525 INFO L208 MainTranslator]: Completed translation [2021-11-21 01:28:43,525 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:28:43 WrapperNode [2021-11-21 01:28:43,526 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-21 01:28:43,527 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-21 01:28:43,527 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-21 01:28:43,528 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-21 01:28:43,537 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:28:43" (1/1) ... [2021-11-21 01:28:43,546 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:28:43" (1/1) ... [2021-11-21 01:28:43,568 INFO L137 Inliner]: procedures = 16, calls = 12, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 44 [2021-11-21 01:28:43,569 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-21 01:28:43,570 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-21 01:28:43,570 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-21 01:28:43,570 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-21 01:28:43,581 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:28:43" (1/1) ... [2021-11-21 01:28:43,581 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:28:43" (1/1) ... [2021-11-21 01:28:43,583 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:28:43" (1/1) ... [2021-11-21 01:28:43,584 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:28:43" (1/1) ... [2021-11-21 01:28:43,589 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:28:43" (1/1) ... [2021-11-21 01:28:43,594 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:28:43" (1/1) ... [2021-11-21 01:28:43,595 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:28:43" (1/1) ... [2021-11-21 01:28:43,598 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-21 01:28:43,599 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-21 01:28:43,599 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-21 01:28:43,600 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-21 01:28:43,601 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:28:43" (1/1) ... [2021-11-21 01:28:43,617 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-21 01:28:43,632 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06079599-17ab-4975-a7ec-0159b1d93e6b/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:28:43,647 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06079599-17ab-4975-a7ec-0159b1d93e6b/bin/utaipan-TEXQjIfE4P/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-21 01:28:43,651 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06079599-17ab-4975-a7ec-0159b1d93e6b/bin/utaipan-TEXQjIfE4P/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-21 01:28:43,693 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-21 01:28:43,694 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-21 01:28:43,694 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-11-21 01:28:43,694 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-11-21 01:28:43,694 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-21 01:28:43,695 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-21 01:28:43,695 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-11-21 01:28:43,695 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-11-21 01:28:43,764 INFO L236 CfgBuilder]: Building ICFG [2021-11-21 01:28:43,766 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-21 01:28:43,960 INFO L277 CfgBuilder]: Performing block encoding [2021-11-21 01:28:44,001 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-21 01:28:44,001 INFO L301 CfgBuilder]: Removed 2 assume(true) statements. [2021-11-21 01:28:44,004 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.11 01:28:44 BoogieIcfgContainer [2021-11-21 01:28:44,004 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-21 01:28:44,006 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-21 01:28:44,006 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-21 01:28:44,011 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-21 01:28:44,011 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.11 01:28:43" (1/3) ... [2021-11-21 01:28:44,012 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3253e15e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.11 01:28:44, skipping insertion in model container [2021-11-21 01:28:44,012 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:28:43" (2/3) ... [2021-11-21 01:28:44,013 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3253e15e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.11 01:28:44, skipping insertion in model container [2021-11-21 01:28:44,013 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.11 01:28:44" (3/3) ... [2021-11-21 01:28:44,015 INFO L111 eAbstractionObserver]: Analyzing ICFG simple_array_index_value_3.i [2021-11-21 01:28:44,022 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-21 01:28:44,022 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-21 01:28:44,083 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-21 01:28:44,094 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 01:28:44,094 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-21 01:28:44,111 INFO L276 IsEmpty]: Start isEmpty. Operand has 8 states, 6 states have (on average 1.6666666666666667) 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 01:28:44,117 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2021-11-21 01:28:44,117 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:28:44,118 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1] [2021-11-21 01:28:44,119 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:28:44,127 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:28:44,127 INFO L85 PathProgramCache]: Analyzing trace with hash 79450772, now seen corresponding path program 1 times [2021-11-21 01:28:44,139 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:28:44,139 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [255246788] [2021-11-21 01:28:44,140 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:28:44,141 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:28:44,271 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:28:44,449 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 01:28:44,450 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:28:44,450 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [255246788] [2021-11-21 01:28:44,451 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [255246788] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 01:28:44,452 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 01:28:44,452 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-21 01:28:44,454 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1123018963] [2021-11-21 01:28:44,455 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:28:44,459 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-21 01:28:44,460 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:28:44,489 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-21 01:28:44,490 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-21 01:28:44,493 INFO L87 Difference]: Start difference. First operand has 8 states, 6 states have (on average 1.6666666666666667) 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) Second operand has 3 states, 3 states have (on average 1.6666666666666667) internal successors, (5), 2 states have internal predecessors, (5), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:28:44,556 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:28:44,557 INFO L93 Difference]: Finished difference Result 20 states and 26 transitions. [2021-11-21 01:28:44,558 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-21 01:28:44,560 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 1.6666666666666667) internal successors, (5), 2 states have internal predecessors, (5), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 5 [2021-11-21 01:28:44,560 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:28:44,568 INFO L225 Difference]: With dead ends: 20 [2021-11-21 01:28:44,568 INFO L226 Difference]: Without dead ends: 13 [2021-11-21 01:28:44,571 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 01:28:44,594 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 4 mSDsluCounter, 3 mSDsCounter, 0 mSdLazyCounter, 10 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4 SdHoareTripleChecker+Valid, 6 SdHoareTripleChecker+Invalid, 12 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 10 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-21 01:28:44,595 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [4 Valid, 6 Invalid, 12 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 10 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-21 01:28:44,616 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2021-11-21 01:28:44,629 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 8. [2021-11-21 01:28:44,630 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 8 states, 7 states have (on average 1.2857142857142858) internal successors, (9), 7 states have internal predecessors, (9), 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 01:28:44,631 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8 states to 8 states and 9 transitions. [2021-11-21 01:28:44,632 INFO L78 Accepts]: Start accepts. Automaton has 8 states and 9 transitions. Word has length 5 [2021-11-21 01:28:44,632 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:28:44,633 INFO L470 AbstractCegarLoop]: Abstraction has 8 states and 9 transitions. [2021-11-21 01:28:44,633 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 1.6666666666666667) internal successors, (5), 2 states have internal predecessors, (5), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:28:44,633 INFO L276 IsEmpty]: Start isEmpty. Operand 8 states and 9 transitions. [2021-11-21 01:28:44,634 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2021-11-21 01:28:44,634 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:28:44,634 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2021-11-21 01:28:44,634 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-21 01:28:44,635 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:28:44,636 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:28:44,636 INFO L85 PathProgramCache]: Analyzing trace with hash -1878084873, now seen corresponding path program 1 times [2021-11-21 01:28:44,637 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:28:44,637 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [117305895] [2021-11-21 01:28:44,638 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:28:44,639 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:28:44,704 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:28:44,773 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:28:44,773 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:28:44,774 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [117305895] [2021-11-21 01:28:44,774 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [117305895] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:28:44,775 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1285103810] [2021-11-21 01:28:44,775 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:28:44,775 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:28:44,775 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06079599-17ab-4975-a7ec-0159b1d93e6b/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:28:44,778 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06079599-17ab-4975-a7ec-0159b1d93e6b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:28:44,779 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06079599-17ab-4975-a7ec-0159b1d93e6b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-21 01:28:44,911 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:28:44,913 INFO L263 TraceCheckSpWp]: Trace formula consists of 54 conjuncts, 16 conjunts are in the unsatisfiable core [2021-11-21 01:28:44,919 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:28:45,010 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 11 treesize of output 7 [2021-11-21 01:28:45,189 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 82 treesize of output 66 [2021-11-21 01:28:45,208 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:28:45,208 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:28:45,451 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 16 [2021-11-21 01:28:45,461 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 34 treesize of output 32 [2021-11-21 01:28:45,514 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:28:45,515 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1285103810] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:28:45,515 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2034550154] [2021-11-21 01:28:45,548 INFO L159 IcfgInterpreter]: Started Sifa with 6 locations of interest [2021-11-21 01:28:45,549 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:28:45,558 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:28:45,565 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:28:45,566 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:28:45,636 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:28:45,666 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-21 01:28:45,669 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2021-11-21 01:28:45,751 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:28:45,754 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 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 17 treesize of output 22 [2021-11-21 01:28:45,827 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:28:45,829 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 34 treesize of output 36 [2021-11-21 01:28:46,005 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:28:46,009 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:28:46,014 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:28:46,042 INFO L354 Elim1Store]: treesize reduction 63, result has 10.0 percent of original size [2021-11-21 01:28:46,043 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 192 treesize of output 189 [2021-11-21 01:28:46,367 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 21 treesize of output 17 [2021-11-21 01:28:46,867 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:28:47,140 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:28:47,141 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:28:47,141 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 5, 5] total 10 [2021-11-21 01:28:47,142 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [902025397] [2021-11-21 01:28:47,142 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:28:47,142 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2021-11-21 01:28:47,142 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:28:47,143 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-11-21 01:28:47,144 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=161, Unknown=0, NotChecked=0, Total=210 [2021-11-21 01:28:47,144 INFO L87 Difference]: Start difference. First operand 8 states and 9 transitions. Second operand has 11 states, 11 states have (on average 1.3636363636363635) internal successors, (15), 10 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 01:28:47,231 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:28:47,231 INFO L93 Difference]: Finished difference Result 24 states and 26 transitions. [2021-11-21 01:28:47,233 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-21 01:28:47,233 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 1.3636363636363635) internal successors, (15), 10 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 6 [2021-11-21 01:28:47,233 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:28:47,234 INFO L225 Difference]: With dead ends: 24 [2021-11-21 01:28:47,234 INFO L226 Difference]: Without dead ends: 19 [2021-11-21 01:28:47,235 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 5 SyntacticMatches, 1 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 54 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=55, Invalid=185, Unknown=0, NotChecked=0, Total=240 [2021-11-21 01:28:47,236 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 12 mSDsluCounter, 26 mSDsCounter, 0 mSdLazyCounter, 46 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 25 SdHoareTripleChecker+Invalid, 50 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 46 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 01:28:47,238 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [12 Valid, 25 Invalid, 50 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 46 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 01:28:47,240 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2021-11-21 01:28:47,243 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 9. [2021-11-21 01:28:47,244 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 9 states, 8 states have (on average 1.25) internal successors, (10), 8 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 01:28:47,244 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9 states to 9 states and 10 transitions. [2021-11-21 01:28:47,245 INFO L78 Accepts]: Start accepts. Automaton has 9 states and 10 transitions. Word has length 6 [2021-11-21 01:28:47,245 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:28:47,245 INFO L470 AbstractCegarLoop]: Abstraction has 9 states and 10 transitions. [2021-11-21 01:28:47,245 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 11 states have (on average 1.3636363636363635) internal successors, (15), 10 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 01:28:47,246 INFO L276 IsEmpty]: Start isEmpty. Operand 9 states and 10 transitions. [2021-11-21 01:28:47,246 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2021-11-21 01:28:47,246 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:28:47,246 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1] [2021-11-21 01:28:47,277 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06079599-17ab-4975-a7ec-0159b1d93e6b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-21 01:28:47,447 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06079599-17ab-4975-a7ec-0159b1d93e6b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:28:47,447 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:28:47,448 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:28:47,448 INFO L85 PathProgramCache]: Analyzing trace with hash 1862819572, now seen corresponding path program 2 times [2021-11-21 01:28:47,448 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:28:47,448 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [924419452] [2021-11-21 01:28:47,448 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:28:47,449 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:28:47,472 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:28:47,534 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:28:47,534 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:28:47,534 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [924419452] [2021-11-21 01:28:47,535 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [924419452] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:28:47,535 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [706021403] [2021-11-21 01:28:47,535 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 01:28:47,535 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:28:47,535 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06079599-17ab-4975-a7ec-0159b1d93e6b/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:28:47,536 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06079599-17ab-4975-a7ec-0159b1d93e6b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:28:47,554 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06079599-17ab-4975-a7ec-0159b1d93e6b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-21 01:28:47,584 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-11-21 01:28:47,584 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:28:47,585 INFO L263 TraceCheckSpWp]: Trace formula consists of 60 conjuncts, 20 conjunts are in the unsatisfiable core [2021-11-21 01:28:47,586 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:28:47,609 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 11 treesize of output 7 [2021-11-21 01:28:47,636 INFO L354 Elim1Store]: treesize reduction 21, result has 25.0 percent of original size [2021-11-21 01:28:47,637 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 21 treesize of output 20 [2021-11-21 01:28:47,727 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 82 treesize of output 66 [2021-11-21 01:28:47,740 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:28:47,741 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:28:47,953 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 29 treesize of output 27 [2021-11-21 01:28:47,959 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 96 treesize of output 94 [2021-11-21 01:28:48,046 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:28:48,046 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [706021403] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:28:48,046 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [929172622] [2021-11-21 01:28:48,049 INFO L159 IcfgInterpreter]: Started Sifa with 6 locations of interest [2021-11-21 01:28:48,049 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:28:48,049 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:28:48,050 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:28:48,050 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:28:48,085 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:28:48,087 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:28:48,108 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-21 01:28:48,111 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2021-11-21 01:28:48,137 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:28:48,139 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 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 17 treesize of output 22 [2021-11-21 01:28:48,216 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:28:48,220 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 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 01:28:48,341 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:28:48,343 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:28:48,379 INFO L354 Elim1Store]: treesize reduction 74, result has 25.3 percent of original size [2021-11-21 01:28:48,380 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 184 treesize of output 191 [2021-11-21 01:28:48,730 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 21 treesize of output 17 [2021-11-21 01:28:49,088 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:28:49,421 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:28:49,421 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:28:49,421 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 6, 6] total 13 [2021-11-21 01:28:49,422 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [146004999] [2021-11-21 01:28:49,422 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:28:49,422 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2021-11-21 01:28:49,423 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:28:49,423 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-11-21 01:28:49,424 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=61, Invalid=245, Unknown=0, NotChecked=0, Total=306 [2021-11-21 01:28:49,424 INFO L87 Difference]: Start difference. First operand 9 states and 10 transitions. Second operand has 14 states, 14 states have (on average 1.2857142857142858) internal successors, (18), 13 states have internal predecessors, (18), 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 01:28:49,575 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:28:49,575 INFO L93 Difference]: Finished difference Result 30 states and 32 transitions. [2021-11-21 01:28:49,576 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-21 01:28:49,576 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 1.2857142857142858) internal successors, (18), 13 states have internal predecessors, (18), 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 01:28:49,577 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:28:49,577 INFO L225 Difference]: With dead ends: 30 [2021-11-21 01:28:49,577 INFO L226 Difference]: Without dead ends: 25 [2021-11-21 01:28:49,578 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 6 SyntacticMatches, 1 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 89 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=68, Invalid=274, Unknown=0, NotChecked=0, Total=342 [2021-11-21 01:28:49,579 INFO L933 BasicCegarLoop]: 6 mSDtfsCounter, 20 mSDsluCounter, 57 mSDsCounter, 0 mSdLazyCounter, 77 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 20 SdHoareTripleChecker+Valid, 59 SdHoareTripleChecker+Invalid, 96 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 77 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 11 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 01:28:49,580 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [20 Valid, 59 Invalid, 96 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 77 Invalid, 0 Unknown, 11 Unchecked, 0.1s Time] [2021-11-21 01:28:49,581 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2021-11-21 01:28:49,584 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 10. [2021-11-21 01:28:49,584 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 10 states, 9 states have (on average 1.2222222222222223) internal successors, (11), 9 states have internal predecessors, (11), 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 01:28:49,585 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 10 states to 10 states and 11 transitions. [2021-11-21 01:28:49,585 INFO L78 Accepts]: Start accepts. Automaton has 10 states and 11 transitions. Word has length 7 [2021-11-21 01:28:49,585 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:28:49,585 INFO L470 AbstractCegarLoop]: Abstraction has 10 states and 11 transitions. [2021-11-21 01:28:49,593 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 1.2857142857142858) internal successors, (18), 13 states have internal predecessors, (18), 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 01:28:49,594 INFO L276 IsEmpty]: Start isEmpty. Operand 10 states and 11 transitions. [2021-11-21 01:28:49,594 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2021-11-21 01:28:49,595 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:28:49,595 INFO L514 BasicCegarLoop]: trace histogram [3, 1, 1, 1, 1, 1] [2021-11-21 01:28:49,642 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06079599-17ab-4975-a7ec-0159b1d93e6b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-21 01:28:49,812 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06079599-17ab-4975-a7ec-0159b1d93e6b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:28:49,813 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:28:49,813 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:28:49,814 INFO L85 PathProgramCache]: Analyzing trace with hash 1866740375, now seen corresponding path program 3 times [2021-11-21 01:28:49,814 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:28:49,814 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1432836173] [2021-11-21 01:28:49,814 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:28:49,814 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:28:49,859 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:28:49,946 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:28:49,946 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:28:49,946 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1432836173] [2021-11-21 01:28:49,947 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1432836173] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:28:49,947 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [837722963] [2021-11-21 01:28:49,947 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-21 01:28:49,947 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:28:49,947 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06079599-17ab-4975-a7ec-0159b1d93e6b/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:28:49,948 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06079599-17ab-4975-a7ec-0159b1d93e6b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:28:49,970 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06079599-17ab-4975-a7ec-0159b1d93e6b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-21 01:28:50,006 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-21 01:28:50,006 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:28:50,008 INFO L263 TraceCheckSpWp]: Trace formula consists of 66 conjuncts, 24 conjunts are in the unsatisfiable core [2021-11-21 01:28:50,010 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:28:50,036 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 19 treesize of output 15 [2021-11-21 01:28:50,076 INFO L354 Elim1Store]: treesize reduction 57, result has 20.8 percent of original size [2021-11-21 01:28:50,076 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 35 treesize of output 34 [2021-11-21 01:28:50,119 INFO L354 Elim1Store]: treesize reduction 21, result has 25.0 percent of original size [2021-11-21 01:28:50,119 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 21 treesize of output 20 [2021-11-21 01:28:50,211 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 82 treesize of output 66 [2021-11-21 01:28:50,227 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:28:50,228 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:28:50,544 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 40 treesize of output 38 [2021-11-21 01:28:50,552 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 942 treesize of output 934 [2021-11-21 01:28:51,180 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 1 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:28:51,180 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [837722963] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:28:51,181 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [174318184] [2021-11-21 01:28:51,183 INFO L159 IcfgInterpreter]: Started Sifa with 6 locations of interest [2021-11-21 01:28:51,183 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:28:51,184 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:28:51,184 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:28:51,184 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:28:51,223 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:28:51,237 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-21 01:28:51,237 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 17 treesize of output 26 [2021-11-21 01:28:51,279 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:28:51,280 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:28:51,298 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-21 01:28:51,299 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2021-11-21 01:28:51,354 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:28:51,355 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 28 treesize of output 30 [2021-11-21 01:28:51,460 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:28:51,461 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:28:51,506 INFO L354 Elim1Store]: treesize reduction 74, result has 25.3 percent of original size [2021-11-21 01:28:51,507 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 188 treesize of output 195 [2021-11-21 01:28:51,781 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 21 treesize of output 17 [2021-11-21 01:28:52,196 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:28:52,464 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:28:52,464 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:28:52,464 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 7, 7] total 16 [2021-11-21 01:28:52,464 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [709345908] [2021-11-21 01:28:52,465 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:28:52,465 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2021-11-21 01:28:52,465 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:28:52,466 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-11-21 01:28:52,466 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=76, Invalid=344, Unknown=0, NotChecked=0, Total=420 [2021-11-21 01:28:52,467 INFO L87 Difference]: Start difference. First operand 10 states and 11 transitions. Second operand has 17 states, 17 states have (on average 1.2352941176470589) internal successors, (21), 16 states have internal predecessors, (21), 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 01:28:52,773 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:28:52,774 INFO L93 Difference]: Finished difference Result 20 states and 23 transitions. [2021-11-21 01:28:52,774 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-11-21 01:28:52,774 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 1.2352941176470589) internal successors, (21), 16 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 8 [2021-11-21 01:28:52,774 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:28:52,775 INFO L225 Difference]: With dead ends: 20 [2021-11-21 01:28:52,775 INFO L226 Difference]: Without dead ends: 15 [2021-11-21 01:28:52,775 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 30 GetRequests, 7 SyntacticMatches, 1 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 135 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=97, Invalid=455, Unknown=0, NotChecked=0, Total=552 [2021-11-21 01:28:52,777 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 3 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 59 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 22 SdHoareTripleChecker+Invalid, 87 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 59 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 21 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 01:28:52,777 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3 Valid, 22 Invalid, 87 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 59 Invalid, 0 Unknown, 21 Unchecked, 0.1s Time] [2021-11-21 01:28:52,778 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2021-11-21 01:28:52,781 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 13. [2021-11-21 01:28:52,781 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 13 states, 12 states have (on average 1.1666666666666667) internal successors, (14), 12 states have internal predecessors, (14), 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 01:28:52,782 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 14 transitions. [2021-11-21 01:28:52,782 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 14 transitions. Word has length 8 [2021-11-21 01:28:52,782 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:28:52,782 INFO L470 AbstractCegarLoop]: Abstraction has 13 states and 14 transitions. [2021-11-21 01:28:52,783 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 17 states have (on average 1.2352941176470589) internal successors, (21), 16 states have internal predecessors, (21), 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 01:28:52,783 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 14 transitions. [2021-11-21 01:28:52,783 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-11-21 01:28:52,783 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:28:52,783 INFO L514 BasicCegarLoop]: trace histogram [4, 2, 1, 1, 1, 1, 1, 1] [2021-11-21 01:28:52,833 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06079599-17ab-4975-a7ec-0159b1d93e6b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-21 01:28:52,984 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06079599-17ab-4975-a7ec-0159b1d93e6b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable3 [2021-11-21 01:28:52,984 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:28:52,985 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:28:52,985 INFO L85 PathProgramCache]: Analyzing trace with hash 1117591870, now seen corresponding path program 1 times [2021-11-21 01:28:52,985 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:28:52,985 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [617309418] [2021-11-21 01:28:52,985 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:28:52,986 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:28:53,020 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:28:53,114 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 01:28:53,115 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:28:53,115 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [617309418] [2021-11-21 01:28:53,115 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [617309418] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:28:53,115 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [766880896] [2021-11-21 01:28:53,115 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:28:53,116 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:28:53,116 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06079599-17ab-4975-a7ec-0159b1d93e6b/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:28:53,117 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06079599-17ab-4975-a7ec-0159b1d93e6b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:28:53,153 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06079599-17ab-4975-a7ec-0159b1d93e6b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-21 01:28:53,193 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:28:53,195 INFO L263 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 30 conjunts are in the unsatisfiable core [2021-11-21 01:28:53,197 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:28:53,249 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 19 treesize of output 15 [2021-11-21 01:28:53,292 INFO L354 Elim1Store]: treesize reduction 27, result has 25.0 percent of original size [2021-11-21 01:28:53,293 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 23 treesize of output 22 [2021-11-21 01:28:53,334 INFO L354 Elim1Store]: treesize reduction 27, result has 25.0 percent of original size [2021-11-21 01:28:53,334 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 23 treesize of output 22 [2021-11-21 01:28:53,521 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 90 treesize of output 66 [2021-11-21 01:28:53,552 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:28:53,552 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:28:54,232 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 85 treesize of output 81 [2021-11-21 01:28:54,244 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 1059 treesize of output 1043 [2021-11-21 01:29:02,114 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:29:02,114 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [766880896] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:29:02,114 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1207978985] [2021-11-21 01:29:02,118 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-21 01:29:02,118 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:29:02,118 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:29:02,119 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:29:02,119 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:29:02,152 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:29:02,154 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:29:02,170 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-21 01:29:02,171 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2021-11-21 01:29:02,199 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:29:02,200 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 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 17 treesize of output 22 [2021-11-21 01:29:02,249 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:29:02,251 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 36 treesize of output 38 [2021-11-21 01:29:02,354 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:29:02,357 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:29:02,361 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:29:02,375 INFO L354 Elim1Store]: treesize reduction 63, result has 10.0 percent of original size [2021-11-21 01:29:02,376 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 196 treesize of output 193 [2021-11-21 01:29:02,542 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 21 treesize of output 17 [2021-11-21 01:29:03,736 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:29:04,147 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:29:04,147 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:29:04,148 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 9, 9] total 21 [2021-11-21 01:29:04,148 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1801706885] [2021-11-21 01:29:04,148 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:29:04,148 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2021-11-21 01:29:04,148 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:29:04,149 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-11-21 01:29:04,149 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=93, Invalid=609, Unknown=0, NotChecked=0, Total=702 [2021-11-21 01:29:04,150 INFO L87 Difference]: Start difference. First operand 13 states and 14 transitions. Second operand has 22 states, 22 states have (on average 1.4545454545454546) internal successors, (32), 21 states have internal predecessors, (32), 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 01:29:04,963 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:29:04,964 INFO L93 Difference]: Finished difference Result 69 states and 73 transitions. [2021-11-21 01:29:04,965 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2021-11-21 01:29:04,965 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 1.4545454545454546) internal successors, (32), 21 states have internal predecessors, (32), 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 01:29:04,965 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:29:04,966 INFO L225 Difference]: With dead ends: 69 [2021-11-21 01:29:04,966 INFO L226 Difference]: Without dead ends: 62 [2021-11-21 01:29:04,968 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 14 SyntacticMatches, 4 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 329 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=165, Invalid=1025, Unknown=0, NotChecked=0, Total=1190 [2021-11-21 01:29:04,969 INFO L933 BasicCegarLoop]: 9 mSDtfsCounter, 98 mSDsluCounter, 149 mSDsCounter, 0 mSdLazyCounter, 219 mSolverCounterSat, 34 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 98 SdHoareTripleChecker+Valid, 154 SdHoareTripleChecker+Invalid, 312 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 34 IncrementalHoareTripleChecker+Valid, 219 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 59 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-21 01:29:04,969 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [98 Valid, 154 Invalid, 312 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [34 Valid, 219 Invalid, 0 Unknown, 59 Unchecked, 0.3s Time] [2021-11-21 01:29:04,970 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2021-11-21 01:29:04,976 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 18. [2021-11-21 01:29:04,977 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 18 states, 17 states have (on average 1.1764705882352942) internal successors, (20), 17 states have internal predecessors, (20), 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 01:29:04,978 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 20 transitions. [2021-11-21 01:29:04,978 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 20 transitions. Word has length 12 [2021-11-21 01:29:04,978 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:29:04,978 INFO L470 AbstractCegarLoop]: Abstraction has 18 states and 20 transitions. [2021-11-21 01:29:04,979 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 22 states have (on average 1.4545454545454546) internal successors, (32), 21 states have internal predecessors, (32), 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 01:29:04,979 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 20 transitions. [2021-11-21 01:29:04,980 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2021-11-21 01:29:04,980 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:29:04,980 INFO L514 BasicCegarLoop]: trace histogram [6, 2, 1, 1, 1, 1, 1, 1] [2021-11-21 01:29:05,025 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06079599-17ab-4975-a7ec-0159b1d93e6b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-21 01:29:05,194 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06079599-17ab-4975-a7ec-0159b1d93e6b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:29:05,194 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:29:05,194 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:29:05,195 INFO L85 PathProgramCache]: Analyzing trace with hash 1834770654, now seen corresponding path program 2 times [2021-11-21 01:29:05,195 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:29:05,195 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2112224904] [2021-11-21 01:29:05,195 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:29:05,195 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:29:05,247 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:29:05,417 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-21 01:29:05,417 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:29:05,417 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2112224904] [2021-11-21 01:29:05,418 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2112224904] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:29:05,418 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [601822475] [2021-11-21 01:29:05,418 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 01:29:05,418 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:29:05,419 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06079599-17ab-4975-a7ec-0159b1d93e6b/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:29:05,422 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06079599-17ab-4975-a7ec-0159b1d93e6b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:29:05,427 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06079599-17ab-4975-a7ec-0159b1d93e6b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-21 01:29:05,628 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-11-21 01:29:05,629 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:29:05,631 INFO L263 TraceCheckSpWp]: Trace formula consists of 96 conjuncts, 47 conjunts are in the unsatisfiable core [2021-11-21 01:29:05,634 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:29:05,697 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 21 treesize of output 17 [2021-11-21 01:29:05,770 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:29:05,771 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 49 treesize of output 36 [2021-11-21 01:29:05,819 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:29:05,820 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:29:05,821 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:29:05,828 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-21 01:29:05,828 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 1 case distinctions, treesize of input 50 treesize of output 52 [2021-11-21 01:29:05,881 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:29:05,882 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:29:05,883 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:29:05,885 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-21 01:29:05,886 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 1 case distinctions, treesize of input 32 treesize of output 34 [2021-11-21 01:29:05,935 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:29:05,937 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:29:05,938 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:29:05,941 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-21 01:29:05,941 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 1 case distinctions, treesize of input 38 treesize of output 40 [2021-11-21 01:29:05,992 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-21 01:29:05,993 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:29:07,318 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 133 treesize of output 129 [2021-11-21 01:29:07,329 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 36027 treesize of output 35899 [2021-11-21 01:40:07,556 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 0 proven. 23 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:40:07,556 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [601822475] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:40:07,557 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [508224251] [2021-11-21 01:40:07,559 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-21 01:40:07,559 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:40:07,559 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:40:07,559 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:40:07,560 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:40:07,589 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:40:07,590 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:40:07,605 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-21 01:40:07,605 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2021-11-21 01:40:07,630 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:40:07,631 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 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 17 treesize of output 22 [2021-11-21 01:40:07,690 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:40:07,691 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 28 treesize of output 30 [2021-11-21 01:40:07,745 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:40:07,745 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:40:07,768 INFO L354 Elim1Store]: treesize reduction 74, result has 25.3 percent of original size [2021-11-21 01:40:07,770 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 188 treesize of output 195 [2021-11-21 01:40:07,923 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 21 treesize of output 17 [2021-11-21 01:40:08,672 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:40:09,106 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:40:09,106 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:40:09,106 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 12] total 26 [2021-11-21 01:40:09,106 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1074664358] [2021-11-21 01:40:09,106 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:40:09,107 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2021-11-21 01:40:09,107 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:40:09,107 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2021-11-21 01:40:09,108 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=187, Invalid=805, Unknown=0, NotChecked=0, Total=992 [2021-11-21 01:40:09,108 INFO L87 Difference]: Start difference. First operand 18 states and 20 transitions. Second operand has 27 states, 27 states have (on average 1.2592592592592593) internal successors, (34), 26 states have internal predecessors, (34), 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 01:40:16,337 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:40:16,337 INFO L93 Difference]: Finished difference Result 40 states and 51 transitions. [2021-11-21 01:40:16,337 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-11-21 01:40:16,338 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 27 states have (on average 1.2592592592592593) internal successors, (34), 26 states have internal predecessors, (34), 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 14 [2021-11-21 01:40:16,338 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:40:16,340 INFO L225 Difference]: With dead ends: 40 [2021-11-21 01:40:16,340 INFO L226 Difference]: Without dead ends: 30 [2021-11-21 01:40:16,341 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 18 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 387 ImplicationChecksByTransitivity, 8.5s TimeCoverageRelationStatistics Valid=329, Invalid=1153, Unknown=0, NotChecked=0, Total=1482 [2021-11-21 01:40:16,342 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 5 mSDsluCounter, 28 mSDsCounter, 0 mSdLazyCounter, 110 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 30 SdHoareTripleChecker+Invalid, 143 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 110 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 25 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-21 01:40:16,342 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [5 Valid, 30 Invalid, 143 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 110 Invalid, 0 Unknown, 25 Unchecked, 0.5s Time] [2021-11-21 01:40:16,343 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2021-11-21 01:40:16,357 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 26. [2021-11-21 01:40:16,357 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 25 states have (on average 1.36) internal successors, (34), 25 states have internal predecessors, (34), 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 01:40:16,358 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 34 transitions. [2021-11-21 01:40:16,358 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 34 transitions. Word has length 14 [2021-11-21 01:40:16,358 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:40:16,358 INFO L470 AbstractCegarLoop]: Abstraction has 26 states and 34 transitions. [2021-11-21 01:40:16,359 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 27 states have (on average 1.2592592592592593) internal successors, (34), 26 states have internal predecessors, (34), 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 01:40:16,359 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 34 transitions. [2021-11-21 01:40:16,359 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2021-11-21 01:40:16,360 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:40:16,360 INFO L514 BasicCegarLoop]: trace histogram [7, 3, 2, 2, 1, 1, 1, 1] [2021-11-21 01:40:16,367 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06079599-17ab-4975-a7ec-0159b1d93e6b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Ended with exit code 0 [2021-11-21 01:40:16,564 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06079599-17ab-4975-a7ec-0159b1d93e6b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:40:16,564 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:40:16,564 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:40:16,564 INFO L85 PathProgramCache]: Analyzing trace with hash -253162665, now seen corresponding path program 3 times [2021-11-21 01:40:16,565 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:40:16,565 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [185800985] [2021-11-21 01:40:16,565 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:40:16,565 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:40:16,596 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:40:16,704 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-21 01:40:16,705 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:40:16,705 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [185800985] [2021-11-21 01:40:16,705 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [185800985] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:40:16,705 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1085806436] [2021-11-21 01:40:16,705 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-21 01:40:16,706 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:40:16,706 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06079599-17ab-4975-a7ec-0159b1d93e6b/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:40:16,706 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06079599-17ab-4975-a7ec-0159b1d93e6b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:40:16,708 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06079599-17ab-4975-a7ec-0159b1d93e6b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-21 01:40:16,784 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-21 01:40:16,785 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:40:16,786 INFO L263 TraceCheckSpWp]: Trace formula consists of 114 conjuncts, 17 conjunts are in the unsatisfiable core [2021-11-21 01:40:16,787 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:40:16,866 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-21 01:40:16,867 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:40:17,024 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-21 01:40:17,024 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1085806436] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:40:17,024 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1504973121] [2021-11-21 01:40:17,025 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-21 01:40:17,025 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:40:17,026 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:40:17,026 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:40:17,026 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:40:17,054 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:40:17,055 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:40:17,068 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-21 01:40:17,070 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2021-11-21 01:40:17,087 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:40:17,088 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 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 17 treesize of output 22 [2021-11-21 01:40:17,125 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:40:17,127 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 36 treesize of output 38 [2021-11-21 01:40:17,212 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:40:17,214 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:40:17,218 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:40:17,236 INFO L354 Elim1Store]: treesize reduction 63, result has 10.0 percent of original size [2021-11-21 01:40:17,237 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 196 treesize of output 193 [2021-11-21 01:40:17,417 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 21 treesize of output 17 [2021-11-21 01:40:18,290 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:40:18,575 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:40:18,576 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:40:18,576 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 18 [2021-11-21 01:40:18,576 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1931236899] [2021-11-21 01:40:18,576 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:40:18,577 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2021-11-21 01:40:18,577 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:40:18,577 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-11-21 01:40:18,578 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=132, Invalid=420, Unknown=0, NotChecked=0, Total=552 [2021-11-21 01:40:18,578 INFO L87 Difference]: Start difference. First operand 26 states and 34 transitions. Second operand has 19 states, 19 states have (on average 1.3157894736842106) internal successors, (25), 18 states have internal predecessors, (25), 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 01:40:20,160 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:40:20,160 INFO L93 Difference]: Finished difference Result 107 states and 117 transitions. [2021-11-21 01:40:20,161 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-11-21 01:40:20,161 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 1.3157894736842106) internal successors, (25), 18 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 18 [2021-11-21 01:40:20,163 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:40:20,164 INFO L225 Difference]: With dead ends: 107 [2021-11-21 01:40:20,164 INFO L226 Difference]: Without dead ends: 97 [2021-11-21 01:40:20,165 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 68 GetRequests, 38 SyntacticMatches, 1 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 127 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=265, Invalid=665, Unknown=0, NotChecked=0, Total=930 [2021-11-21 01:40:20,166 INFO L933 BasicCegarLoop]: 22 mSDtfsCounter, 326 mSDsluCounter, 178 mSDsCounter, 0 mSdLazyCounter, 234 mSolverCounterSat, 109 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 326 SdHoareTripleChecker+Valid, 200 SdHoareTripleChecker+Invalid, 343 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 109 IncrementalHoareTripleChecker+Valid, 234 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-21 01:40:20,166 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [326 Valid, 200 Invalid, 343 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [109 Valid, 234 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-21 01:40:20,167 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 97 states. [2021-11-21 01:40:20,174 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 97 to 25. [2021-11-21 01:40:20,174 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25 states, 24 states have (on average 1.0833333333333333) internal successors, (26), 24 states have internal predecessors, (26), 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 01:40:20,175 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 26 transitions. [2021-11-21 01:40:20,175 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 26 transitions. Word has length 18 [2021-11-21 01:40:20,175 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:40:20,175 INFO L470 AbstractCegarLoop]: Abstraction has 25 states and 26 transitions. [2021-11-21 01:40:20,175 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 19 states have (on average 1.3157894736842106) internal successors, (25), 18 states have internal predecessors, (25), 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 01:40:20,176 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 26 transitions. [2021-11-21 01:40:20,176 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2021-11-21 01:40:20,176 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:40:20,177 INFO L514 BasicCegarLoop]: trace histogram [16, 2, 1, 1, 1, 1, 1, 1] [2021-11-21 01:40:20,216 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06079599-17ab-4975-a7ec-0159b1d93e6b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-21 01:40:20,390 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06079599-17ab-4975-a7ec-0159b1d93e6b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:40:20,390 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:40:20,390 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:40:20,390 INFO L85 PathProgramCache]: Analyzing trace with hash 2040377086, now seen corresponding path program 4 times [2021-11-21 01:40:20,391 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:40:20,391 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [175156763] [2021-11-21 01:40:20,391 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:40:20,391 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:40:20,453 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:40:20,720 INFO L134 CoverageAnalysis]: Checked inductivity of 138 backedges. 0 proven. 136 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-21 01:40:20,720 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:40:20,721 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [175156763] [2021-11-21 01:40:20,721 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [175156763] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:40:20,721 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2087941453] [2021-11-21 01:40:20,721 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-21 01:40:20,721 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:40:20,721 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06079599-17ab-4975-a7ec-0159b1d93e6b/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:40:20,722 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06079599-17ab-4975-a7ec-0159b1d93e6b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:40:20,723 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_06079599-17ab-4975-a7ec-0159b1d93e6b/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-21 01:40:21,245 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:40:21,248 WARN L261 TraceCheckSpWp]: Trace formula consists of 156 conjuncts, 78 conjunts are in the unsatisfiable core [2021-11-21 01:40:21,250 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:40:21,293 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 13 treesize of output 9 [2021-11-21 01:40:21,326 INFO L354 Elim1Store]: treesize reduction 39, result has 18.8 percent of original size [2021-11-21 01:40:21,327 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 29 treesize of output 28 [2021-11-21 01:40:21,362 INFO L354 Elim1Store]: treesize reduction 39, result has 18.8 percent of original size [2021-11-21 01:40:21,363 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 29 treesize of output 28 [2021-11-21 01:40:21,402 INFO L354 Elim1Store]: treesize reduction 39, result has 18.8 percent of original size [2021-11-21 01:40:21,402 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 29 treesize of output 28 [2021-11-21 01:40:21,435 INFO L354 Elim1Store]: treesize reduction 27, result has 25.0 percent of original size [2021-11-21 01:40:21,436 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 23 treesize of output 22 [2021-11-21 01:40:21,475 INFO L354 Elim1Store]: treesize reduction 39, result has 18.8 percent of original size [2021-11-21 01:40:21,475 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 29 treesize of output 28 [2021-11-21 01:40:21,510 INFO L354 Elim1Store]: treesize reduction 27, result has 25.0 percent of original size [2021-11-21 01:40:21,511 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 23 treesize of output 22 [2021-11-21 01:40:21,559 INFO L354 Elim1Store]: treesize reduction 39, result has 18.8 percent of original size [2021-11-21 01:40:21,560 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 29 treesize of output 28 [2021-11-21 01:40:21,607 INFO L354 Elim1Store]: treesize reduction 27, result has 25.0 percent of original size [2021-11-21 01:40:21,607 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 23 treesize of output 22 [2021-11-21 01:40:21,652 INFO L354 Elim1Store]: treesize reduction 27, result has 25.0 percent of original size [2021-11-21 01:40:21,652 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 23 treesize of output 22 [2021-11-21 01:40:21,698 INFO L354 Elim1Store]: treesize reduction 27, result has 25.0 percent of original size [2021-11-21 01:40:21,699 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 23 treesize of output 22 [2021-11-21 01:40:21,737 INFO L354 Elim1Store]: treesize reduction 27, result has 25.0 percent of original size [2021-11-21 01:40:21,737 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 23 treesize of output 22 [2021-11-21 01:40:21,777 INFO L354 Elim1Store]: treesize reduction 39, result has 18.8 percent of original size [2021-11-21 01:40:21,777 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 29 treesize of output 28 [2021-11-21 01:40:21,815 INFO L354 Elim1Store]: treesize reduction 27, result has 25.0 percent of original size [2021-11-21 01:40:21,816 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 23 treesize of output 22 [2021-11-21 01:40:21,851 INFO L354 Elim1Store]: treesize reduction 27, result has 25.0 percent of original size [2021-11-21 01:40:21,852 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 23 treesize of output 22 [2021-11-21 01:40:21,975 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 90 treesize of output 66 [2021-11-21 01:40:22,000 INFO L134 CoverageAnalysis]: Checked inductivity of 138 backedges. 0 proven. 138 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:40:22,000 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:41:42,300 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 349 treesize of output 345