./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/array-examples/standard_two_index_04.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 839c364b Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4f2b7679-16c3-4008-aa87-8868619d0779/bin/utaipan-eEHZpOm5b7/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4f2b7679-16c3-4008-aa87-8868619d0779/bin/utaipan-eEHZpOm5b7/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4f2b7679-16c3-4008-aa87-8868619d0779/bin/utaipan-eEHZpOm5b7/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4f2b7679-16c3-4008-aa87-8868619d0779/bin/utaipan-eEHZpOm5b7/config/TaipanReach.xml -i ../../sv-benchmarks/c/array-examples/standard_two_index_04.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4f2b7679-16c3-4008-aa87-8868619d0779/bin/utaipan-eEHZpOm5b7/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4f2b7679-16c3-4008-aa87-8868619d0779/bin/utaipan-eEHZpOm5b7 --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 707ac1569fc13aaf70722a6e3f0da30ae8a39e673c650cb4b45c765a74a9f24d --- Real Ultimate output --- This is Ultimate 0.2.2-hotfix-svcomp22-839c364 [2021-11-25 18:47:54,491 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-25 18:47:54,493 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-25 18:47:54,537 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-25 18:47:54,538 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-25 18:47:54,540 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-25 18:47:54,542 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-25 18:47:54,546 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-25 18:47:54,549 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-25 18:47:54,551 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-25 18:47:54,553 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-25 18:47:54,555 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-25 18:47:54,556 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-25 18:47:54,558 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-25 18:47:54,560 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-25 18:47:54,562 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-25 18:47:54,564 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-25 18:47:54,566 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-25 18:47:54,569 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-25 18:47:54,573 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-25 18:47:54,576 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-25 18:47:54,584 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-25 18:47:54,593 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-25 18:47:54,595 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-25 18:47:54,600 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-25 18:47:54,613 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-25 18:47:54,614 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-25 18:47:54,615 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-25 18:47:54,616 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-25 18:47:54,617 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-25 18:47:54,618 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-25 18:47:54,619 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-25 18:47:54,620 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-25 18:47:54,621 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-25 18:47:54,623 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-25 18:47:54,623 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-25 18:47:54,624 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-25 18:47:54,624 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-25 18:47:54,624 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-25 18:47:54,625 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-25 18:47:54,626 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-25 18:47:54,630 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4f2b7679-16c3-4008-aa87-8868619d0779/bin/utaipan-eEHZpOm5b7/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-25 18:47:54,692 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-25 18:47:54,695 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-25 18:47:54,696 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-25 18:47:54,697 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-25 18:47:54,705 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-25 18:47:54,705 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-25 18:47:54,706 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-25 18:47:54,706 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-25 18:47:54,706 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-25 18:47:54,707 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-25 18:47:54,708 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-25 18:47:54,709 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-25 18:47:54,709 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-25 18:47:54,709 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-25 18:47:54,710 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-25 18:47:54,710 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-25 18:47:54,710 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-25 18:47:54,711 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-25 18:47:54,712 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-25 18:47:54,712 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-25 18:47:54,712 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-25 18:47:54,712 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-25 18:47:54,713 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-25 18:47:54,713 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-25 18:47:54,713 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-25 18:47:54,714 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-25 18:47:54,716 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-25 18:47:54,717 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-25 18:47:54,717 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-25 18:47:54,717 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-25 18:47:54,718 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-25 18:47:54,719 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-25 18:47:54,719 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-25 18:47:54,719 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-25 18:47:54,720 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-25 18:47:54,720 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-25 18:47:54,720 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-25 18:47:54,721 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-25 18:47:54,721 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-25 18:47:54,721 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-25 18:47:54,721 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-25 18:47:54,722 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_4f2b7679-16c3-4008-aa87-8868619d0779/bin/utaipan-eEHZpOm5b7/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4f2b7679-16c3-4008-aa87-8868619d0779/bin/utaipan-eEHZpOm5b7 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 707ac1569fc13aaf70722a6e3f0da30ae8a39e673c650cb4b45c765a74a9f24d [2021-11-25 18:47:55,036 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-25 18:47:55,078 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-25 18:47:55,081 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-25 18:47:55,082 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-25 18:47:55,084 INFO L275 PluginConnector]: CDTParser initialized [2021-11-25 18:47:55,086 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4f2b7679-16c3-4008-aa87-8868619d0779/bin/utaipan-eEHZpOm5b7/../../sv-benchmarks/c/array-examples/standard_two_index_04.i [2021-11-25 18:47:55,195 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4f2b7679-16c3-4008-aa87-8868619d0779/bin/utaipan-eEHZpOm5b7/data/fb49793e9/4d107a8f22114216be05210b53435475/FLAGeca86e111 [2021-11-25 18:47:55,812 INFO L306 CDTParser]: Found 1 translation units. [2021-11-25 18:47:55,813 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4f2b7679-16c3-4008-aa87-8868619d0779/sv-benchmarks/c/array-examples/standard_two_index_04.i [2021-11-25 18:47:55,826 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4f2b7679-16c3-4008-aa87-8868619d0779/bin/utaipan-eEHZpOm5b7/data/fb49793e9/4d107a8f22114216be05210b53435475/FLAGeca86e111 [2021-11-25 18:47:56,152 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4f2b7679-16c3-4008-aa87-8868619d0779/bin/utaipan-eEHZpOm5b7/data/fb49793e9/4d107a8f22114216be05210b53435475 [2021-11-25 18:47:56,155 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-25 18:47:56,157 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-25 18:47:56,168 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-25 18:47:56,168 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-25 18:47:56,173 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-25 18:47:56,174 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 06:47:56" (1/1) ... [2021-11-25 18:47:56,175 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@637d2679 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:47:56, skipping insertion in model container [2021-11-25 18:47:56,176 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 06:47:56" (1/1) ... [2021-11-25 18:47:56,184 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-25 18:47:56,201 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-25 18:47:56,441 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_4f2b7679-16c3-4008-aa87-8868619d0779/sv-benchmarks/c/array-examples/standard_two_index_04.i[814,827] [2021-11-25 18:47:56,459 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-25 18:47:56,468 INFO L203 MainTranslator]: Completed pre-run [2021-11-25 18:47:56,484 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_4f2b7679-16c3-4008-aa87-8868619d0779/sv-benchmarks/c/array-examples/standard_two_index_04.i[814,827] [2021-11-25 18:47:56,493 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-25 18:47:56,510 INFO L208 MainTranslator]: Completed translation [2021-11-25 18:47:56,511 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:47:56 WrapperNode [2021-11-25 18:47:56,511 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-25 18:47:56,513 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-25 18:47:56,513 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-25 18:47:56,513 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-25 18:47:56,523 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:47:56" (1/1) ... [2021-11-25 18:47:56,532 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:47:56" (1/1) ... [2021-11-25 18:47:56,555 INFO L137 Inliner]: procedures = 16, calls = 18, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 59 [2021-11-25 18:47:56,556 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-25 18:47:56,557 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-25 18:47:56,557 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-25 18:47:56,558 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-25 18:47:56,568 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:47:56" (1/1) ... [2021-11-25 18:47:56,569 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:47:56" (1/1) ... [2021-11-25 18:47:56,571 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:47:56" (1/1) ... [2021-11-25 18:47:56,572 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:47:56" (1/1) ... [2021-11-25 18:47:56,578 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:47:56" (1/1) ... [2021-11-25 18:47:56,583 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:47:56" (1/1) ... [2021-11-25 18:47:56,585 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:47:56" (1/1) ... [2021-11-25 18:47:56,587 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-25 18:47:56,589 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-25 18:47:56,589 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-25 18:47:56,589 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-25 18:47:56,591 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:47:56" (1/1) ... [2021-11-25 18:47:56,600 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-25 18:47:56,613 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4f2b7679-16c3-4008-aa87-8868619d0779/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:47:56,631 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4f2b7679-16c3-4008-aa87-8868619d0779/bin/utaipan-eEHZpOm5b7/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-25 18:47:56,636 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4f2b7679-16c3-4008-aa87-8868619d0779/bin/utaipan-eEHZpOm5b7/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-25 18:47:56,685 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-25 18:47:56,685 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-25 18:47:56,685 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-11-25 18:47:56,686 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-11-25 18:47:56,686 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-25 18:47:56,686 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-25 18:47:56,686 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-11-25 18:47:56,687 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-11-25 18:47:56,779 INFO L236 CfgBuilder]: Building ICFG [2021-11-25 18:47:56,781 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-25 18:47:56,996 INFO L277 CfgBuilder]: Performing block encoding [2021-11-25 18:47:57,042 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-25 18:47:57,045 INFO L301 CfgBuilder]: Removed 3 assume(true) statements. [2021-11-25 18:47:57,048 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 06:47:57 BoogieIcfgContainer [2021-11-25 18:47:57,049 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-25 18:47:57,052 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-25 18:47:57,052 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-25 18:47:57,057 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-25 18:47:57,057 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 25.11 06:47:56" (1/3) ... [2021-11-25 18:47:57,058 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1cbe532b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 06:47:57, skipping insertion in model container [2021-11-25 18:47:57,059 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 06:47:56" (2/3) ... [2021-11-25 18:47:57,059 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1cbe532b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 06:47:57, skipping insertion in model container [2021-11-25 18:47:57,060 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 06:47:57" (3/3) ... [2021-11-25 18:47:57,061 INFO L111 eAbstractionObserver]: Analyzing ICFG standard_two_index_04.i [2021-11-25 18:47:57,068 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-25 18:47:57,069 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-25 18:47:57,154 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-25 18:47:57,167 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 [2021-11-25 18:47:57,167 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-25 18:47:57,200 INFO L276 IsEmpty]: Start isEmpty. Operand has 9 states, 7 states have (on average 1.7142857142857142) internal successors, (12), 8 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:47:57,211 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2021-11-25 18:47:57,212 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:47:57,213 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2021-11-25 18:47:57,214 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:47:57,221 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:47:57,221 INFO L85 PathProgramCache]: Analyzing trace with hash -1776518481, now seen corresponding path program 1 times [2021-11-25 18:47:57,233 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:47:57,234 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2056449923] [2021-11-25 18:47:57,234 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:47:57,235 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:47:57,379 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:47:57,500 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:47:57,501 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:47:57,501 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2056449923] [2021-11-25 18:47:57,502 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2056449923] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:47:57,503 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 18:47:57,503 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-25 18:47:57,505 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1982965759] [2021-11-25 18:47:57,506 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:47:57,511 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 18:47:57,525 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:47:57,589 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 18:47:57,591 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 18:47:57,593 INFO L87 Difference]: Start difference. First operand has 9 states, 7 states have (on average 1.7142857142857142) internal successors, (12), 8 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 3 states, 3 states have (on average 2.0) internal successors, (6), 2 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:47:57,674 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:47:57,674 INFO L93 Difference]: Finished difference Result 17 states and 23 transitions. [2021-11-25 18:47:57,676 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 18:47:57,678 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.0) internal successors, (6), 2 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 6 [2021-11-25 18:47:57,686 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:47:57,700 INFO L225 Difference]: With dead ends: 17 [2021-11-25 18:47:57,700 INFO L226 Difference]: Without dead ends: 9 [2021-11-25 18:47:57,704 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 [2021-11-25 18:47:57,709 INFO L933 BasicCegarLoop]: 6 mSDtfsCounter, 0 mSDsluCounter, 3 mSDsCounter, 0 mSdLazyCounter, 12 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 9 SdHoareTripleChecker+Invalid, 12 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 12 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 18:47:57,713 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 9 Invalid, 12 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 12 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 18:47:57,734 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9 states. [2021-11-25 18:47:57,750 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9 to 9. [2021-11-25 18:47:57,751 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 9 states, 8 states have (on average 1.375) internal successors, (11), 8 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) [2021-11-25 18:47:57,753 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9 states to 9 states and 11 transitions. [2021-11-25 18:47:57,755 INFO L78 Accepts]: Start accepts. Automaton has 9 states and 11 transitions. Word has length 6 [2021-11-25 18:47:57,756 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:47:57,756 INFO L470 AbstractCegarLoop]: Abstraction has 9 states and 11 transitions. [2021-11-25 18:47:57,756 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 2.0) internal successors, (6), 2 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:47:57,757 INFO L276 IsEmpty]: Start isEmpty. Operand 9 states and 11 transitions. [2021-11-25 18:47:57,757 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2021-11-25 18:47:57,758 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:47:57,758 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:47:57,759 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-25 18:47:57,760 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:47:57,762 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:47:57,763 INFO L85 PathProgramCache]: Analyzing trace with hash -612832272, now seen corresponding path program 1 times [2021-11-25 18:47:57,763 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:47:57,763 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [607556894] [2021-11-25 18:47:57,764 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:47:57,764 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:47:57,811 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:47:57,877 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 18:47:57,878 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:47:57,878 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [607556894] [2021-11-25 18:47:57,879 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [607556894] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:47:57,879 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [847133861] [2021-11-25 18:47:57,879 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:47:57,880 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:47:57,898 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4f2b7679-16c3-4008-aa87-8868619d0779/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:47:57,909 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4f2b7679-16c3-4008-aa87-8868619d0779/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:47:57,916 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4f2b7679-16c3-4008-aa87-8868619d0779/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-25 18:47:57,988 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:47:57,990 INFO L263 TraceCheckSpWp]: Trace formula consists of 78 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-25 18:47:57,994 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:47:58,033 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 18:47:58,033 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 18:47:58,035 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [847133861] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 18:47:58,040 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-25 18:47:58,041 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [3] total 4 [2021-11-25 18:47:58,042 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [848285405] [2021-11-25 18:47:58,042 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 18:47:58,045 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 18:47:58,045 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:47:58,047 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 18:47:58,048 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-25 18:47:58,050 INFO L87 Difference]: Start difference. First operand 9 states and 11 transitions. Second operand has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 3 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:47:58,098 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:47:58,098 INFO L93 Difference]: Finished difference Result 20 states and 23 transitions. [2021-11-25 18:47:58,099 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 18:47:58,099 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 3 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 7 [2021-11-25 18:47:58,099 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:47:58,100 INFO L225 Difference]: With dead ends: 20 [2021-11-25 18:47:58,100 INFO L226 Difference]: Without dead ends: 15 [2021-11-25 18:47:58,101 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-25 18:47:58,104 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 4 mSDsluCounter, 3 mSDsCounter, 0 mSdLazyCounter, 11 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4 SdHoareTripleChecker+Valid, 6 SdHoareTripleChecker+Invalid, 13 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 11 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-25 18:47:58,106 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [4 Valid, 6 Invalid, 13 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 11 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-25 18:47:58,108 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2021-11-25 18:47:58,112 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 10. [2021-11-25 18:47:58,113 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 10 states, 9 states have (on average 1.3333333333333333) internal successors, (12), 9 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:47:58,115 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 10 states to 10 states and 12 transitions. [2021-11-25 18:47:58,116 INFO L78 Accepts]: Start accepts. Automaton has 10 states and 12 transitions. Word has length 7 [2021-11-25 18:47:58,116 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:47:58,116 INFO L470 AbstractCegarLoop]: Abstraction has 10 states and 12 transitions. [2021-11-25 18:47:58,117 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 3 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:47:58,118 INFO L276 IsEmpty]: Start isEmpty. Operand 10 states and 12 transitions. [2021-11-25 18:47:58,120 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2021-11-25 18:47:58,120 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:47:58,120 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 18:47:58,152 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4f2b7679-16c3-4008-aa87-8868619d0779/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-25 18:47:58,329 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4f2b7679-16c3-4008-aa87-8868619d0779/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:47:58,330 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:47:58,330 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:47:58,330 INFO L85 PathProgramCache]: Analyzing trace with hash -1851389444, now seen corresponding path program 1 times [2021-11-25 18:47:58,330 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:47:58,331 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [154184096] [2021-11-25 18:47:58,331 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:47:58,331 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:47:58,351 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:47:58,392 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 18:47:58,392 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:47:58,393 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [154184096] [2021-11-25 18:47:58,393 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [154184096] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:47:58,393 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1593596233] [2021-11-25 18:47:58,393 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:47:58,393 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:47:58,394 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4f2b7679-16c3-4008-aa87-8868619d0779/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:47:58,395 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4f2b7679-16c3-4008-aa87-8868619d0779/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:47:58,417 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4f2b7679-16c3-4008-aa87-8868619d0779/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-25 18:47:58,461 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:47:58,462 INFO L263 TraceCheckSpWp]: Trace formula consists of 87 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-25 18:47:58,463 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:47:58,543 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 18:47:58,545 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:47:58,586 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-25 18:47:58,587 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1593596233] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:47:58,587 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [353221053] [2021-11-25 18:47:58,613 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-25 18:47:58,613 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:47:58,618 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:47:58,625 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:47:58,626 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:47:58,750 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:47:58,752 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:47:58,807 INFO L354 Elim1Store]: treesize reduction 37, result has 32.7 percent of original size [2021-11-25 18:47:58,808 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 20 treesize of output 34 [2021-11-25 18:47:58,854 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:47:58,856 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:47:58,903 INFO L354 Elim1Store]: treesize reduction 60, result has 24.1 percent of original size [2021-11-25 18:47:58,903 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 39 treesize of output 53 [2021-11-25 18:47:58,998 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:47:59,002 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2021-11-25 18:47:59,278 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:47:59,283 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:47:59,289 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:47:59,310 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-25 18:47:59,311 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 262 treesize of output 250 [2021-11-25 18:47:59,468 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-25 18:47:59,515 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:47:59,517 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 17 treesize of output 17 [2021-11-25 18:47:59,597 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:47:59,598 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:47:59,671 INFO L354 Elim1Store]: treesize reduction 110, result has 30.8 percent of original size [2021-11-25 18:47:59,672 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 6 case distinctions, treesize of input 78 treesize of output 103 [2021-11-25 18:47:59,883 INFO L354 Elim1Store]: treesize reduction 50, result has 19.4 percent of original size [2021-11-25 18:47:59,884 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 25 treesize of output 25 [2021-11-25 18:47:59,918 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:48:00,115 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '164#(and (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (= |ULTIMATE.start_main_~#b~0#1.offset| 0) (= |ULTIMATE.start_main_~i~0#1| 1) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (ite (= |ULTIMATE.start_main_#t~mem4#1| |ULTIMATE.start_main_#t~mem3#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start_main_#t~mem4#1| (select (select |#memory_int| |ULTIMATE.start_main_~#b~0#1.base|) (+ |ULTIMATE.start_main_~#b~0#1.offset| 4 (* |ULTIMATE.start_main_~j~0#1| 16)))) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start_main_#t~mem3#1| (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~j~0#1| 4)))) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start_main_~j~0#1| 0) (<= 0 |ULTIMATE.start_main_~#b~0#1.base|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 18:48:00,116 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:48:00,116 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 18:48:00,117 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3, 3] total 6 [2021-11-25 18:48:00,117 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [89561327] [2021-11-25 18:48:00,117 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 18:48:00,119 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-25 18:48:00,119 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:48:00,120 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-25 18:48:00,121 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=49, Invalid=83, Unknown=0, NotChecked=0, Total=132 [2021-11-25 18:48:00,121 INFO L87 Difference]: Start difference. First operand 10 states and 12 transitions. Second operand has 7 states, 7 states have (on average 1.8571428571428572) internal successors, (13), 6 states have internal predecessors, (13), 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) [2021-11-25 18:48:00,187 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:48:00,187 INFO L93 Difference]: Finished difference Result 31 states and 38 transitions. [2021-11-25 18:48:00,188 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-25 18:48:00,188 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 1.8571428571428572) internal successors, (13), 6 states have internal predecessors, (13), 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 [2021-11-25 18:48:00,188 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:48:00,189 INFO L225 Difference]: With dead ends: 31 [2021-11-25 18:48:00,190 INFO L226 Difference]: Without dead ends: 24 [2021-11-25 18:48:00,192 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 15 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 36 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=49, Invalid=83, Unknown=0, NotChecked=0, Total=132 [2021-11-25 18:48:00,203 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 15 mSDsluCounter, 9 mSDsCounter, 0 mSdLazyCounter, 22 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 15 SdHoareTripleChecker+Valid, 12 SdHoareTripleChecker+Invalid, 33 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 22 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-25 18:48:00,205 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [15 Valid, 12 Invalid, 33 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 22 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-25 18:48:00,207 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2021-11-25 18:48:00,211 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 14. [2021-11-25 18:48:00,212 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 14 states, 13 states have (on average 1.2307692307692308) internal successors, (16), 13 states have internal predecessors, (16), 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) [2021-11-25 18:48:00,214 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 16 transitions. [2021-11-25 18:48:00,214 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 16 transitions. Word has length 8 [2021-11-25 18:48:00,215 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:48:00,215 INFO L470 AbstractCegarLoop]: Abstraction has 14 states and 16 transitions. [2021-11-25 18:48:00,216 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 1.8571428571428572) internal successors, (13), 6 states have internal predecessors, (13), 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) [2021-11-25 18:48:00,216 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 16 transitions. [2021-11-25 18:48:00,217 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-11-25 18:48:00,217 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:48:00,217 INFO L514 BasicCegarLoop]: trace histogram [4, 2, 1, 1, 1, 1, 1, 1] [2021-11-25 18:48:00,263 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4f2b7679-16c3-4008-aa87-8868619d0779/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-25 18:48:00,441 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4f2b7679-16c3-4008-aa87-8868619d0779/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:48:00,442 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:48:00,442 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:48:00,442 INFO L85 PathProgramCache]: Analyzing trace with hash -1413922641, now seen corresponding path program 2 times [2021-11-25 18:48:00,443 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:48:00,443 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [790439940] [2021-11-25 18:48:00,443 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:48:00,443 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:48:00,497 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:48:00,550 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-25 18:48:00,550 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:48:00,550 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [790439940] [2021-11-25 18:48:00,551 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [790439940] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:48:00,551 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1099269291] [2021-11-25 18:48:00,551 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 18:48:00,551 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:48:00,551 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4f2b7679-16c3-4008-aa87-8868619d0779/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:48:00,552 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4f2b7679-16c3-4008-aa87-8868619d0779/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:48:00,573 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4f2b7679-16c3-4008-aa87-8868619d0779/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-25 18:48:00,625 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-11-25 18:48:00,626 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 18:48:00,627 INFO L263 TraceCheckSpWp]: Trace formula consists of 105 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-25 18:48:00,629 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:48:00,663 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-25 18:48:00,663 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:48:00,711 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-25 18:48:00,711 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1099269291] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:48:00,711 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [180311796] [2021-11-25 18:48:00,714 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-25 18:48:00,715 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:48:00,715 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:48:00,715 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:48:00,715 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:48:00,743 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:00,744 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:00,785 INFO L354 Elim1Store]: treesize reduction 37, result has 32.7 percent of original size [2021-11-25 18:48:00,786 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 20 treesize of output 34 [2021-11-25 18:48:00,804 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:00,806 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:00,853 INFO L354 Elim1Store]: treesize reduction 60, result has 24.1 percent of original size [2021-11-25 18:48:00,853 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 39 treesize of output 53 [2021-11-25 18:48:00,897 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:00,898 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 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 [2021-11-25 18:48:01,036 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:01,037 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 18:48:01,074 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-25 18:48:01,074 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 252 treesize of output 251 [2021-11-25 18:48:01,292 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-25 18:48:01,319 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:01,320 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 20 treesize of output 20 [2021-11-25 18:48:01,354 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:01,362 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:01,432 INFO L354 Elim1Store]: treesize reduction 118, result has 31.8 percent of original size [2021-11-25 18:48:01,432 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 5 case distinctions, treesize of input 81 treesize of output 109 [2021-11-25 18:48:01,539 INFO L354 Elim1Store]: treesize reduction 50, result has 19.4 percent of original size [2021-11-25 18:48:01,539 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 25 treesize of output 25 [2021-11-25 18:48:01,583 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:48:01,748 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '312#(and (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (= |ULTIMATE.start_main_~#b~0#1.offset| 0) (= |ULTIMATE.start_main_~i~0#1| 1) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (ite (= |ULTIMATE.start_main_#t~mem4#1| |ULTIMATE.start_main_#t~mem3#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start_main_#t~mem4#1| (select (select |#memory_int| |ULTIMATE.start_main_~#b~0#1.base|) (+ |ULTIMATE.start_main_~#b~0#1.offset| 4 (* |ULTIMATE.start_main_~j~0#1| 16)))) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start_main_#t~mem3#1| (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~j~0#1| 4)))) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start_main_~j~0#1| 0) (<= 0 |ULTIMATE.start_main_~#b~0#1.base|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 18:48:01,748 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:48:01,748 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 18:48:01,748 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 9 [2021-11-25 18:48:01,748 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2043412027] [2021-11-25 18:48:01,749 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 18:48:01,749 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-25 18:48:01,749 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:48:01,750 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-25 18:48:01,750 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=76, Invalid=106, Unknown=0, NotChecked=0, Total=182 [2021-11-25 18:48:01,750 INFO L87 Difference]: Start difference. First operand 14 states and 16 transitions. Second operand has 9 states, 9 states have (on average 1.6666666666666667) internal successors, (15), 9 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) [2021-11-25 18:48:01,832 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:48:01,832 INFO L93 Difference]: Finished difference Result 54 states and 63 transitions. [2021-11-25 18:48:01,832 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-25 18:48:01,833 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 1.6666666666666667) internal successors, (15), 9 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 12 [2021-11-25 18:48:01,833 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:48:01,837 INFO L225 Difference]: With dead ends: 54 [2021-11-25 18:48:01,837 INFO L226 Difference]: Without dead ends: 46 [2021-11-25 18:48:01,838 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 27 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 64 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=76, Invalid=106, Unknown=0, NotChecked=0, Total=182 [2021-11-25 18:48:01,841 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 44 mSDsluCounter, 15 mSDsCounter, 0 mSdLazyCounter, 31 mSolverCounterSat, 28 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 44 SdHoareTripleChecker+Valid, 18 SdHoareTripleChecker+Invalid, 59 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 28 IncrementalHoareTripleChecker+Valid, 31 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 18:48:01,847 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [44 Valid, 18 Invalid, 59 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [28 Valid, 31 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 18:48:01,849 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2021-11-25 18:48:01,859 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 20. [2021-11-25 18:48:01,859 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20 states, 19 states have (on average 1.1578947368421053) internal successors, (22), 19 states have internal predecessors, (22), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:48:01,860 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 22 transitions. [2021-11-25 18:48:01,860 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 22 transitions. Word has length 12 [2021-11-25 18:48:01,860 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:48:01,861 INFO L470 AbstractCegarLoop]: Abstraction has 20 states and 22 transitions. [2021-11-25 18:48:01,863 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 1.6666666666666667) internal successors, (15), 9 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) [2021-11-25 18:48:01,864 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 22 transitions. [2021-11-25 18:48:01,865 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2021-11-25 18:48:01,865 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:48:01,866 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 1, 1, 1, 1, 1, 1] [2021-11-25 18:48:01,913 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4f2b7679-16c3-4008-aa87-8868619d0779/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-25 18:48:02,083 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4f2b7679-16c3-4008-aa87-8868619d0779/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable3 [2021-11-25 18:48:02,084 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:48:02,084 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:48:02,084 INFO L85 PathProgramCache]: Analyzing trace with hash 1373793359, now seen corresponding path program 3 times [2021-11-25 18:48:02,084 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:48:02,084 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [368360913] [2021-11-25 18:48:02,084 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:48:02,085 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:48:02,157 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:48:02,282 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-11-25 18:48:02,282 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:48:02,282 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [368360913] [2021-11-25 18:48:02,282 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [368360913] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:48:02,283 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1663324829] [2021-11-25 18:48:02,283 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 18:48:02,283 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:48:02,283 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4f2b7679-16c3-4008-aa87-8868619d0779/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:48:02,284 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4f2b7679-16c3-4008-aa87-8868619d0779/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:48:02,301 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4f2b7679-16c3-4008-aa87-8868619d0779/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-25 18:48:02,373 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 18:48:02,374 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 18:48:02,375 INFO L263 TraceCheckSpWp]: Trace formula consists of 177 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-25 18:48:02,378 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:48:02,464 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-11-25 18:48:02,464 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:48:02,609 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-11-25 18:48:02,609 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1663324829] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:48:02,610 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1969904617] [2021-11-25 18:48:02,614 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-25 18:48:02,614 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:48:02,614 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:48:02,614 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:48:02,615 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:48:02,641 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:02,643 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:02,679 INFO L354 Elim1Store]: treesize reduction 60, result has 24.1 percent of original size [2021-11-25 18:48:02,680 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 39 treesize of output 53 [2021-11-25 18:48:02,694 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:02,695 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:02,697 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 8 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 27 [2021-11-25 18:48:02,746 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:02,749 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 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 [2021-11-25 18:48:02,832 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:02,833 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 18:48:02,861 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-25 18:48:02,862 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 252 treesize of output 251 [2021-11-25 18:48:03,016 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-25 18:48:03,037 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:03,038 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 22 treesize of output 22 [2021-11-25 18:48:03,078 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:03,135 INFO L354 Elim1Store]: treesize reduction 131, result has 21.6 percent of original size [2021-11-25 18:48:03,136 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 5 case distinctions, treesize of input 83 treesize of output 102 [2021-11-25 18:48:03,203 INFO L354 Elim1Store]: treesize reduction 50, result has 19.4 percent of original size [2021-11-25 18:48:03,204 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 25 treesize of output 25 [2021-11-25 18:48:03,226 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:48:03,386 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '555#(and (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (= |ULTIMATE.start_main_~#b~0#1.offset| 0) (= |ULTIMATE.start_main_~i~0#1| 1) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (ite (= |ULTIMATE.start_main_#t~mem4#1| |ULTIMATE.start_main_#t~mem3#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start_main_#t~mem4#1| (select (select |#memory_int| |ULTIMATE.start_main_~#b~0#1.base|) (+ |ULTIMATE.start_main_~#b~0#1.offset| 4 (* |ULTIMATE.start_main_~j~0#1| 16)))) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start_main_#t~mem3#1| (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~j~0#1| 4)))) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start_main_~j~0#1| 0) (<= 0 |ULTIMATE.start_main_~#b~0#1.base|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 18:48:03,386 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:48:03,386 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 18:48:03,386 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8, 8] total 22 [2021-11-25 18:48:03,387 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1246615780] [2021-11-25 18:48:03,387 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 18:48:03,387 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2021-11-25 18:48:03,388 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:48:03,388 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-11-25 18:48:03,389 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=306, Invalid=396, Unknown=0, NotChecked=0, Total=702 [2021-11-25 18:48:03,389 INFO L87 Difference]: Start difference. First operand 20 states and 22 transitions. Second operand has 22 states, 22 states have (on average 1.4090909090909092) internal successors, (31), 22 states have internal predecessors, (31), 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) [2021-11-25 18:48:03,568 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:48:03,568 INFO L93 Difference]: Finished difference Result 93 states and 112 transitions. [2021-11-25 18:48:03,569 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-11-25 18:48:03,569 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 1.4090909090909092) internal successors, (31), 22 states have internal predecessors, (31), 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 [2021-11-25 18:48:03,569 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:48:03,570 INFO L225 Difference]: With dead ends: 93 [2021-11-25 18:48:03,570 INFO L226 Difference]: Without dead ends: 81 [2021-11-25 18:48:03,571 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 36 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 323 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=306, Invalid=396, Unknown=0, NotChecked=0, Total=702 [2021-11-25 18:48:03,572 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 83 mSDsluCounter, 45 mSDsCounter, 0 mSdLazyCounter, 73 mSolverCounterSat, 77 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 83 SdHoareTripleChecker+Valid, 48 SdHoareTripleChecker+Invalid, 150 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 77 IncrementalHoareTripleChecker+Valid, 73 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 18:48:03,573 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [83 Valid, 48 Invalid, 150 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [77 Valid, 73 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 18:48:03,574 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2021-11-25 18:48:03,580 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 36. [2021-11-25 18:48:03,580 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 36 states, 35 states have (on average 1.0857142857142856) internal successors, (38), 35 states have internal predecessors, (38), 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) [2021-11-25 18:48:03,581 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 38 transitions. [2021-11-25 18:48:03,581 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 38 transitions. Word has length 18 [2021-11-25 18:48:03,581 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:48:03,582 INFO L470 AbstractCegarLoop]: Abstraction has 36 states and 38 transitions. [2021-11-25 18:48:03,582 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 22 states have (on average 1.4090909090909092) internal successors, (31), 22 states have internal predecessors, (31), 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) [2021-11-25 18:48:03,582 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 38 transitions. [2021-11-25 18:48:03,583 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2021-11-25 18:48:03,583 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:48:03,583 INFO L514 BasicCegarLoop]: trace histogram [19, 9, 1, 1, 1, 1, 1, 1] [2021-11-25 18:48:03,629 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4f2b7679-16c3-4008-aa87-8868619d0779/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Ended with exit code 0 [2021-11-25 18:48:03,805 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4f2b7679-16c3-4008-aa87-8868619d0779/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:48:03,805 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:48:03,806 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:48:03,806 INFO L85 PathProgramCache]: Analyzing trace with hash 1806525724, now seen corresponding path program 4 times [2021-11-25 18:48:03,806 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:48:03,806 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [121935416] [2021-11-25 18:48:03,806 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:48:03,807 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:48:03,940 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:48:04,131 INFO L134 CoverageAnalysis]: Checked inductivity of 235 backedges. 0 proven. 45 refuted. 0 times theorem prover too weak. 190 trivial. 0 not checked. [2021-11-25 18:48:04,131 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:48:04,131 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [121935416] [2021-11-25 18:48:04,132 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [121935416] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:48:04,132 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1192988832] [2021-11-25 18:48:04,132 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 18:48:04,132 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:48:04,133 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4f2b7679-16c3-4008-aa87-8868619d0779/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:48:04,142 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4f2b7679-16c3-4008-aa87-8868619d0779/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:48:04,153 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4f2b7679-16c3-4008-aa87-8868619d0779/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-25 18:48:04,317 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:48:04,320 INFO L263 TraceCheckSpWp]: Trace formula consists of 321 conjuncts, 21 conjunts are in the unsatisfiable core [2021-11-25 18:48:04,323 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:48:04,562 INFO L134 CoverageAnalysis]: Checked inductivity of 235 backedges. 0 proven. 190 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2021-11-25 18:48:04,562 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:48:05,114 INFO L134 CoverageAnalysis]: Checked inductivity of 235 backedges. 0 proven. 190 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2021-11-25 18:48:05,115 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1192988832] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:48:05,115 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [192785118] [2021-11-25 18:48:05,118 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-25 18:48:05,118 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:48:05,118 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:48:05,119 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:48:05,119 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:48:05,148 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:05,149 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:05,184 INFO L354 Elim1Store]: treesize reduction 37, result has 32.7 percent of original size [2021-11-25 18:48:05,185 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 20 treesize of output 34 [2021-11-25 18:48:05,200 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:05,201 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:05,243 INFO L354 Elim1Store]: treesize reduction 60, result has 24.1 percent of original size [2021-11-25 18:48:05,244 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 39 treesize of output 53 [2021-11-25 18:48:05,274 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:05,276 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2021-11-25 18:48:05,364 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:05,367 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:05,369 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:05,387 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-25 18:48:05,388 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 262 treesize of output 250 [2021-11-25 18:48:05,457 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-25 18:48:05,481 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:05,482 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 20 treesize of output 20 [2021-11-25 18:48:05,511 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:05,521 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:05,577 INFO L354 Elim1Store]: treesize reduction 118, result has 31.8 percent of original size [2021-11-25 18:48:05,578 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 5 case distinctions, treesize of input 81 treesize of output 109 [2021-11-25 18:48:05,689 INFO L354 Elim1Store]: treesize reduction 50, result has 19.4 percent of original size [2021-11-25 18:48:05,690 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 25 treesize of output 25 [2021-11-25 18:48:05,712 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:48:05,882 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1014#(and (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (= |ULTIMATE.start_main_~#b~0#1.offset| 0) (= |ULTIMATE.start_main_~i~0#1| 1) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (ite (= |ULTIMATE.start_main_#t~mem4#1| |ULTIMATE.start_main_#t~mem3#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start_main_#t~mem4#1| (select (select |#memory_int| |ULTIMATE.start_main_~#b~0#1.base|) (+ |ULTIMATE.start_main_~#b~0#1.offset| 4 (* |ULTIMATE.start_main_~j~0#1| 16)))) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start_main_#t~mem3#1| (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~j~0#1| 4)))) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start_main_~j~0#1| 0) (<= 0 |ULTIMATE.start_main_~#b~0#1.base|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 18:48:05,883 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:48:05,883 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 18:48:05,883 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 21, 21] total 48 [2021-11-25 18:48:05,883 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [489090711] [2021-11-25 18:48:05,883 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 18:48:05,884 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 48 states [2021-11-25 18:48:05,884 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:48:05,885 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2021-11-25 18:48:05,886 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1281, Invalid=1475, Unknown=0, NotChecked=0, Total=2756 [2021-11-25 18:48:05,887 INFO L87 Difference]: Start difference. First operand 36 states and 38 transitions. Second operand has 48 states, 48 states have (on average 1.25) internal successors, (60), 48 states have internal predecessors, (60), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:48:06,200 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:48:06,200 INFO L93 Difference]: Finished difference Result 158 states and 193 transitions. [2021-11-25 18:48:06,201 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2021-11-25 18:48:06,201 INFO L78 Accepts]: Start accepts. Automaton has has 48 states, 48 states have (on average 1.25) internal successors, (60), 48 states have internal predecessors, (60), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 34 [2021-11-25 18:48:06,201 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:48:06,203 INFO L225 Difference]: With dead ends: 158 [2021-11-25 18:48:06,203 INFO L226 Difference]: Without dead ends: 143 [2021-11-25 18:48:06,205 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 112 GetRequests, 61 SyntacticMatches, 0 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1469 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=1281, Invalid=1475, Unknown=0, NotChecked=0, Total=2756 [2021-11-25 18:48:06,206 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 195 mSDsluCounter, 81 mSDsCounter, 0 mSdLazyCounter, 137 mSolverCounterSat, 202 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 195 SdHoareTripleChecker+Valid, 84 SdHoareTripleChecker+Invalid, 339 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 202 IncrementalHoareTripleChecker+Valid, 137 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 18:48:06,206 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [195 Valid, 84 Invalid, 339 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [202 Valid, 137 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-25 18:48:06,207 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 143 states. [2021-11-25 18:48:06,217 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 143 to 68. [2021-11-25 18:48:06,217 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 68 states, 67 states have (on average 1.044776119402985) internal successors, (70), 67 states have internal predecessors, (70), 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) [2021-11-25 18:48:06,219 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 70 transitions. [2021-11-25 18:48:06,219 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 70 transitions. Word has length 34 [2021-11-25 18:48:06,219 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:48:06,219 INFO L470 AbstractCegarLoop]: Abstraction has 68 states and 70 transitions. [2021-11-25 18:48:06,220 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 48 states, 48 states have (on average 1.25) internal successors, (60), 48 states have internal predecessors, (60), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 18:48:06,220 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 70 transitions. [2021-11-25 18:48:06,222 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2021-11-25 18:48:06,222 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:48:06,223 INFO L514 BasicCegarLoop]: trace histogram [45, 15, 1, 1, 1, 1, 1, 1] [2021-11-25 18:48:06,256 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4f2b7679-16c3-4008-aa87-8868619d0779/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-25 18:48:06,445 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4f2b7679-16c3-4008-aa87-8868619d0779/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2021-11-25 18:48:06,446 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:48:06,446 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:48:06,446 INFO L85 PathProgramCache]: Analyzing trace with hash 1491282492, now seen corresponding path program 5 times [2021-11-25 18:48:06,446 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:48:06,446 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1829452769] [2021-11-25 18:48:06,446 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:48:06,447 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:48:06,620 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:48:06,954 INFO L134 CoverageAnalysis]: Checked inductivity of 1155 backedges. 0 proven. 120 refuted. 0 times theorem prover too weak. 1035 trivial. 0 not checked. [2021-11-25 18:48:06,954 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:48:06,954 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1829452769] [2021-11-25 18:48:06,955 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1829452769] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:48:06,955 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [82348855] [2021-11-25 18:48:06,955 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 18:48:06,955 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:48:06,955 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4f2b7679-16c3-4008-aa87-8868619d0779/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:48:06,959 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4f2b7679-16c3-4008-aa87-8868619d0779/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:48:06,977 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4f2b7679-16c3-4008-aa87-8868619d0779/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-25 18:48:10,968 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2021-11-25 18:48:10,968 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 18:48:10,976 INFO L263 TraceCheckSpWp]: Trace formula consists of 348 conjuncts, 17 conjunts are in the unsatisfiable core [2021-11-25 18:48:10,980 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:48:11,178 INFO L134 CoverageAnalysis]: Checked inductivity of 1155 backedges. 0 proven. 120 refuted. 0 times theorem prover too weak. 1035 trivial. 0 not checked. [2021-11-25 18:48:11,178 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:48:11,742 INFO L134 CoverageAnalysis]: Checked inductivity of 1155 backedges. 0 proven. 120 refuted. 0 times theorem prover too weak. 1035 trivial. 0 not checked. [2021-11-25 18:48:11,742 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [82348855] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:48:11,742 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [361588813] [2021-11-25 18:48:11,748 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-25 18:48:11,749 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:48:11,749 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:48:11,749 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:48:11,750 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:48:11,774 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:11,776 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:11,816 INFO L354 Elim1Store]: treesize reduction 60, result has 24.1 percent of original size [2021-11-25 18:48:11,816 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 39 treesize of output 53 [2021-11-25 18:48:11,829 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:11,830 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:11,833 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 8 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 27 [2021-11-25 18:48:11,863 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:11,865 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2021-11-25 18:48:11,942 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:11,945 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:11,948 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:11,963 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-25 18:48:11,964 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 262 treesize of output 250 [2021-11-25 18:48:12,031 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-25 18:48:12,050 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:12,052 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 20 treesize of output 20 [2021-11-25 18:48:12,079 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:12,086 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:12,143 INFO L354 Elim1Store]: treesize reduction 118, result has 31.8 percent of original size [2021-11-25 18:48:12,143 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 5 case distinctions, treesize of input 81 treesize of output 109 [2021-11-25 18:48:12,223 INFO L354 Elim1Store]: treesize reduction 50, result has 19.4 percent of original size [2021-11-25 18:48:12,223 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 25 treesize of output 25 [2021-11-25 18:48:12,244 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:48:12,394 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1822#(and (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (= |ULTIMATE.start_main_~#b~0#1.offset| 0) (= |ULTIMATE.start_main_~i~0#1| 1) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (ite (= |ULTIMATE.start_main_#t~mem4#1| |ULTIMATE.start_main_#t~mem3#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start_main_#t~mem4#1| (select (select |#memory_int| |ULTIMATE.start_main_~#b~0#1.base|) (+ |ULTIMATE.start_main_~#b~0#1.offset| 4 (* |ULTIMATE.start_main_~j~0#1| 16)))) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start_main_#t~mem3#1| (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~j~0#1| 4)))) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start_main_~j~0#1| 0) (<= 0 |ULTIMATE.start_main_~#b~0#1.base|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 18:48:12,394 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:48:12,394 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 18:48:12,394 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 18] total 35 [2021-11-25 18:48:12,395 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [822400924] [2021-11-25 18:48:12,395 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 18:48:12,396 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2021-11-25 18:48:12,396 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:48:12,397 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2021-11-25 18:48:12,398 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=713, Invalid=847, Unknown=0, NotChecked=0, Total=1560 [2021-11-25 18:48:12,398 INFO L87 Difference]: Start difference. First operand 68 states and 70 transitions. Second operand has 35 states, 35 states have (on average 1.1714285714285715) internal successors, (41), 35 states have internal predecessors, (41), 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) [2021-11-25 18:48:12,794 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:48:12,794 INFO L93 Difference]: Finished difference Result 246 states and 265 transitions. [2021-11-25 18:48:12,795 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2021-11-25 18:48:12,795 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 35 states have (on average 1.1714285714285715) internal successors, (41), 35 states have internal predecessors, (41), 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 66 [2021-11-25 18:48:12,795 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:48:12,798 INFO L225 Difference]: With dead ends: 246 [2021-11-25 18:48:12,798 INFO L226 Difference]: Without dead ends: 241 [2021-11-25 18:48:12,799 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 214 GetRequests, 176 SyntacticMatches, 0 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 350 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=713, Invalid=847, Unknown=0, NotChecked=0, Total=1560 [2021-11-25 18:48:12,800 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 436 mSDsluCounter, 93 mSDsCounter, 0 mSdLazyCounter, 135 mSolverCounterSat, 239 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 436 SdHoareTripleChecker+Valid, 96 SdHoareTripleChecker+Invalid, 374 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 239 IncrementalHoareTripleChecker+Valid, 135 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-25 18:48:12,800 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [436 Valid, 96 Invalid, 374 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [239 Valid, 135 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-25 18:48:12,801 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 241 states. [2021-11-25 18:48:12,812 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 241 to 85. [2021-11-25 18:48:12,812 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 85 states, 84 states have (on average 1.0357142857142858) internal successors, (87), 84 states have internal predecessors, (87), 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) [2021-11-25 18:48:12,814 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 87 transitions. [2021-11-25 18:48:12,814 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 87 transitions. Word has length 66 [2021-11-25 18:48:12,815 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:48:12,815 INFO L470 AbstractCegarLoop]: Abstraction has 85 states and 87 transitions. [2021-11-25 18:48:12,815 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 35 states have (on average 1.1714285714285715) internal successors, (41), 35 states have internal predecessors, (41), 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) [2021-11-25 18:48:12,815 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 87 transitions. [2021-11-25 18:48:12,818 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2021-11-25 18:48:12,818 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:48:12,819 INFO L514 BasicCegarLoop]: trace histogram [45, 32, 1, 1, 1, 1, 1, 1] [2021-11-25 18:48:12,864 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4f2b7679-16c3-4008-aa87-8868619d0779/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-25 18:48:13,033 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4f2b7679-16c3-4008-aa87-8868619d0779/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:48:13,034 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:48:13,034 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:48:13,034 INFO L85 PathProgramCache]: Analyzing trace with hash -331046608, now seen corresponding path program 6 times [2021-11-25 18:48:13,034 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:48:13,034 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [512447813] [2021-11-25 18:48:13,034 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:48:13,035 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:48:13,149 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:48:13,850 INFO L134 CoverageAnalysis]: Checked inductivity of 1563 backedges. 0 proven. 528 refuted. 0 times theorem prover too weak. 1035 trivial. 0 not checked. [2021-11-25 18:48:13,850 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:48:13,850 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [512447813] [2021-11-25 18:48:13,851 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [512447813] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:48:13,851 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1718799697] [2021-11-25 18:48:13,851 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 18:48:13,851 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:48:13,851 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4f2b7679-16c3-4008-aa87-8868619d0779/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:48:13,852 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4f2b7679-16c3-4008-aa87-8868619d0779/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:48:13,879 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4f2b7679-16c3-4008-aa87-8868619d0779/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-25 18:48:14,111 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 18:48:14,112 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 18:48:14,117 INFO L263 TraceCheckSpWp]: Trace formula consists of 762 conjuncts, 47 conjunts are in the unsatisfiable core [2021-11-25 18:48:14,122 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:48:14,682 INFO L134 CoverageAnalysis]: Checked inductivity of 1563 backedges. 0 proven. 1035 refuted. 0 times theorem prover too weak. 528 trivial. 0 not checked. [2021-11-25 18:48:14,683 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:48:17,223 INFO L134 CoverageAnalysis]: Checked inductivity of 1563 backedges. 0 proven. 1035 refuted. 0 times theorem prover too weak. 528 trivial. 0 not checked. [2021-11-25 18:48:17,224 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1718799697] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:48:17,224 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1987056885] [2021-11-25 18:48:17,226 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-25 18:48:17,227 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:48:17,227 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:48:17,227 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:48:17,227 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:48:17,255 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:17,256 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:17,290 INFO L354 Elim1Store]: treesize reduction 37, result has 32.7 percent of original size [2021-11-25 18:48:17,290 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 20 treesize of output 34 [2021-11-25 18:48:17,309 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:17,312 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:17,353 INFO L354 Elim1Store]: treesize reduction 60, result has 24.1 percent of original size [2021-11-25 18:48:17,354 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 39 treesize of output 53 [2021-11-25 18:48:17,383 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:17,385 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 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 [2021-11-25 18:48:17,459 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:17,460 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 18:48:17,490 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-25 18:48:17,491 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 252 treesize of output 251 [2021-11-25 18:48:17,654 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-25 18:48:17,696 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:17,697 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 22 treesize of output 22 [2021-11-25 18:48:17,732 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:17,780 INFO L354 Elim1Store]: treesize reduction 131, result has 21.6 percent of original size [2021-11-25 18:48:17,781 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 5 case distinctions, treesize of input 83 treesize of output 102 [2021-11-25 18:48:17,885 INFO L354 Elim1Store]: treesize reduction 50, result has 19.4 percent of original size [2021-11-25 18:48:17,886 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 25 treesize of output 25 [2021-11-25 18:48:17,910 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:48:18,067 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2959#(and (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (= |ULTIMATE.start_main_~#b~0#1.offset| 0) (= |ULTIMATE.start_main_~i~0#1| 1) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (ite (= |ULTIMATE.start_main_#t~mem4#1| |ULTIMATE.start_main_#t~mem3#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start_main_#t~mem4#1| (select (select |#memory_int| |ULTIMATE.start_main_~#b~0#1.base|) (+ |ULTIMATE.start_main_~#b~0#1.offset| 4 (* |ULTIMATE.start_main_~j~0#1| 16)))) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start_main_#t~mem3#1| (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~j~0#1| 4)))) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start_main_~j~0#1| 0) (<= 0 |ULTIMATE.start_main_~#b~0#1.base|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 18:48:18,067 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:48:18,067 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 18:48:18,067 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 47, 47] total 116 [2021-11-25 18:48:18,068 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [541200744] [2021-11-25 18:48:18,068 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 18:48:18,069 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 116 states [2021-11-25 18:48:18,069 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:48:18,072 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 116 interpolants. [2021-11-25 18:48:18,080 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7027, Invalid=7493, Unknown=0, NotChecked=0, Total=14520 [2021-11-25 18:48:18,081 INFO L87 Difference]: Start difference. First operand 85 states and 87 transitions. Second operand has 116 states, 116 states have (on average 1.1637931034482758) internal successors, (135), 116 states have internal predecessors, (135), 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) [2021-11-25 18:48:19,734 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:48:19,734 INFO L93 Difference]: Finished difference Result 429 states and 513 transitions. [2021-11-25 18:48:19,734 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 116 states. [2021-11-25 18:48:19,735 INFO L78 Accepts]: Start accepts. Automaton has has 116 states, 116 states have (on average 1.1637931034482758) internal successors, (135), 116 states have internal predecessors, (135), 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 83 [2021-11-25 18:48:19,735 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:48:19,738 INFO L225 Difference]: With dead ends: 429 [2021-11-25 18:48:19,738 INFO L226 Difference]: Without dead ends: 391 [2021-11-25 18:48:19,744 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 282 GetRequests, 163 SyntacticMatches, 0 SemanticMatches, 119 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7229 ImplicationChecksByTransitivity, 3.3s TimeCoverageRelationStatistics Valid=7027, Invalid=7493, Unknown=0, NotChecked=0, Total=14520 [2021-11-25 18:48:19,744 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 999 mSDsluCounter, 204 mSDsCounter, 0 mSdLazyCounter, 328 mSolverCounterSat, 718 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 999 SdHoareTripleChecker+Valid, 207 SdHoareTripleChecker+Invalid, 1046 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 718 IncrementalHoareTripleChecker+Valid, 328 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-25 18:48:19,745 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [999 Valid, 207 Invalid, 1046 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [718 Valid, 328 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2021-11-25 18:48:19,746 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 391 states. [2021-11-25 18:48:19,761 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 391 to 166. [2021-11-25 18:48:19,762 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 166 states, 165 states have (on average 1.018181818181818) internal successors, (168), 165 states have internal predecessors, (168), 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) [2021-11-25 18:48:19,764 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 166 states to 166 states and 168 transitions. [2021-11-25 18:48:19,764 INFO L78 Accepts]: Start accepts. Automaton has 166 states and 168 transitions. Word has length 83 [2021-11-25 18:48:19,765 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:48:19,765 INFO L470 AbstractCegarLoop]: Abstraction has 166 states and 168 transitions. [2021-11-25 18:48:19,765 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 116 states, 116 states have (on average 1.1637931034482758) internal successors, (135), 116 states have internal predecessors, (135), 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) [2021-11-25 18:48:19,765 INFO L276 IsEmpty]: Start isEmpty. Operand 166 states and 168 transitions. [2021-11-25 18:48:19,768 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 165 [2021-11-25 18:48:19,768 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:48:19,769 INFO L514 BasicCegarLoop]: trace histogram [113, 45, 1, 1, 1, 1, 1, 1] [2021-11-25 18:48:19,800 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4f2b7679-16c3-4008-aa87-8868619d0779/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Ended with exit code 0 [2021-11-25 18:48:19,981 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4f2b7679-16c3-4008-aa87-8868619d0779/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:48:19,982 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:48:19,982 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:48:19,982 INFO L85 PathProgramCache]: Analyzing trace with hash -2085187588, now seen corresponding path program 7 times [2021-11-25 18:48:19,982 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:48:19,983 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1099871793] [2021-11-25 18:48:19,983 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:48:19,983 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:48:20,221 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:48:21,516 INFO L134 CoverageAnalysis]: Checked inductivity of 7476 backedges. 0 proven. 1035 refuted. 0 times theorem prover too weak. 6441 trivial. 0 not checked. [2021-11-25 18:48:21,517 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:48:21,517 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1099871793] [2021-11-25 18:48:21,517 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1099871793] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:48:21,517 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [601434849] [2021-11-25 18:48:21,518 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 18:48:21,518 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:48:21,518 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4f2b7679-16c3-4008-aa87-8868619d0779/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:48:21,525 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4f2b7679-16c3-4008-aa87-8868619d0779/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:48:21,527 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4f2b7679-16c3-4008-aa87-8868619d0779/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-11-25 18:48:21,999 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:48:22,011 INFO L263 TraceCheckSpWp]: Trace formula consists of 1491 conjuncts, 115 conjunts are in the unsatisfiable core [2021-11-25 18:48:22,026 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 18:48:23,863 INFO L134 CoverageAnalysis]: Checked inductivity of 7476 backedges. 0 proven. 6441 refuted. 0 times theorem prover too weak. 1035 trivial. 0 not checked. [2021-11-25 18:48:23,863 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 18:48:33,217 INFO L134 CoverageAnalysis]: Checked inductivity of 7476 backedges. 0 proven. 6441 refuted. 0 times theorem prover too weak. 1035 trivial. 0 not checked. [2021-11-25 18:48:33,218 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [601434849] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 18:48:33,218 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [643506909] [2021-11-25 18:48:33,220 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-25 18:48:33,220 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 18:48:33,221 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 18:48:33,221 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 18:48:33,221 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 18:48:33,252 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:33,254 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:33,287 INFO L354 Elim1Store]: treesize reduction 60, result has 24.1 percent of original size [2021-11-25 18:48:33,287 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 39 treesize of output 53 [2021-11-25 18:48:33,296 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:33,299 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:33,300 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 8 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 27 [2021-11-25 18:48:33,338 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:33,340 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 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 [2021-11-25 18:48:33,399 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:33,402 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 18:48:33,425 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-25 18:48:33,425 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 252 treesize of output 251 [2021-11-25 18:48:33,589 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 12 [2021-11-25 18:48:33,603 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:33,603 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 25 treesize of output 25 [2021-11-25 18:48:33,621 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:33,622 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 18:48:33,660 INFO L354 Elim1Store]: treesize reduction 125, result has 25.1 percent of original size [2021-11-25 18:48:33,661 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 86 treesize of output 108 [2021-11-25 18:48:33,716 INFO L354 Elim1Store]: treesize reduction 50, result has 19.4 percent of original size [2021-11-25 18:48:33,717 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 25 treesize of output 25 [2021-11-25 18:48:33,742 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 18:48:33,894 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5186#(and (<= 0 |ULTIMATE.start_main_~#a~0#1.base|) (= |ULTIMATE.start_main_~#b~0#1.offset| 0) (= |ULTIMATE.start_main_~i~0#1| 1) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (ite (= |ULTIMATE.start_main_#t~mem4#1| |ULTIMATE.start_main_#t~mem3#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start_main_#t~mem4#1| (select (select |#memory_int| |ULTIMATE.start_main_~#b~0#1.base|) (+ |ULTIMATE.start_main_~#b~0#1.offset| 4 (* |ULTIMATE.start_main_~j~0#1| 16)))) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start_main_#t~mem3#1| (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (+ |ULTIMATE.start_main_~#a~0#1.offset| (* |ULTIMATE.start_main_~j~0#1| 4)))) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (= |ULTIMATE.start_main_~j~0#1| 0) (<= 0 |ULTIMATE.start_main_~#b~0#1.base|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 18:48:33,894 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 18:48:33,894 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 18:48:33,894 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [48, 115, 115] total 248 [2021-11-25 18:48:33,894 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1288116405] [2021-11-25 18:48:33,895 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 18:48:33,896 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 248 states [2021-11-25 18:48:33,896 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 18:48:33,905 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 248 interpolants. [2021-11-25 18:48:33,917 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=31381, Invalid=32375, Unknown=0, NotChecked=0, Total=63756 [2021-11-25 18:48:33,918 INFO L87 Difference]: Start difference. First operand 166 states and 168 transitions. Second operand has 248 states, 248 states have (on average 1.1451612903225807) internal successors, (284), 248 states have internal predecessors, (284), 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) [2021-11-25 18:48:43,173 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 18:48:43,174 INFO L93 Difference]: Finished difference Result 754 states and 919 transitions. [2021-11-25 18:48:43,174 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 248 states. [2021-11-25 18:48:43,174 INFO L78 Accepts]: Start accepts. Automaton has has 248 states, 248 states have (on average 1.1451612903225807) internal successors, (284), 248 states have internal predecessors, (284), 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 164 [2021-11-25 18:48:43,175 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 18:48:43,179 INFO L225 Difference]: With dead ends: 754 [2021-11-25 18:48:43,179 INFO L226 Difference]: Without dead ends: 703 [2021-11-25 18:48:43,184 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 538 GetRequests, 287 SyntacticMatches, 0 SemanticMatches, 251 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 34389 ImplicationChecksByTransitivity, 11.4s TimeCoverageRelationStatistics Valid=31381, Invalid=32375, Unknown=0, NotChecked=0, Total=63756 [2021-11-25 18:48:43,185 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 1363 mSDsluCounter, 387 mSDsCounter, 0 mSdLazyCounter, 643 mSolverCounterSat, 1107 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1363 SdHoareTripleChecker+Valid, 390 SdHoareTripleChecker+Invalid, 1750 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1107 IncrementalHoareTripleChecker+Valid, 643 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.1s IncrementalHoareTripleChecker+Time [2021-11-25 18:48:43,186 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1363 Valid, 390 Invalid, 1750 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1107 Valid, 643 Invalid, 0 Unknown, 0 Unchecked, 1.1s Time] [2021-11-25 18:48:43,187 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 703 states. [2021-11-25 18:48:43,214 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 703 to 328. [2021-11-25 18:48:43,215 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 328 states, 327 states have (on average 1.0091743119266054) internal successors, (330), 327 states have internal predecessors, (330), 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) [2021-11-25 18:48:43,219 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 328 states to 328 states and 330 transitions. [2021-11-25 18:48:43,220 INFO L78 Accepts]: Start accepts. Automaton has 328 states and 330 transitions. Word has length 164 [2021-11-25 18:48:43,220 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 18:48:43,221 INFO L470 AbstractCegarLoop]: Abstraction has 328 states and 330 transitions. [2021-11-25 18:48:43,221 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 248 states, 248 states have (on average 1.1451612903225807) internal successors, (284), 248 states have internal predecessors, (284), 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) [2021-11-25 18:48:43,222 INFO L276 IsEmpty]: Start isEmpty. Operand 328 states and 330 transitions. [2021-11-25 18:48:43,228 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 327 [2021-11-25 18:48:43,228 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 18:48:43,229 INFO L514 BasicCegarLoop]: trace histogram [245, 75, 1, 1, 1, 1, 1, 1] [2021-11-25 18:48:43,266 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4f2b7679-16c3-4008-aa87-8868619d0779/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-11-25 18:48:43,445 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4f2b7679-16c3-4008-aa87-8868619d0779/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:48:43,446 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 18:48:43,446 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 18:48:43,446 INFO L85 PathProgramCache]: Analyzing trace with hash 1270733244, now seen corresponding path program 8 times [2021-11-25 18:48:43,446 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 18:48:43,447 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [713610838] [2021-11-25 18:48:43,447 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 18:48:43,447 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 18:48:43,828 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 18:48:46,805 INFO L134 CoverageAnalysis]: Checked inductivity of 32985 backedges. 0 proven. 2850 refuted. 0 times theorem prover too weak. 30135 trivial. 0 not checked. [2021-11-25 18:48:46,805 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 18:48:46,805 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [713610838] [2021-11-25 18:48:46,806 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [713610838] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 18:48:46,806 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1582422763] [2021-11-25 18:48:46,806 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 18:48:46,806 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 18:48:46,806 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4f2b7679-16c3-4008-aa87-8868619d0779/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 18:48:46,808 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4f2b7679-16c3-4008-aa87-8868619d0779/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 18:48:46,809 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4f2b7679-16c3-4008-aa87-8868619d0779/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process