./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/loop-acceleration/array_3-2.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_dd6fd660-d188-4f34-93aa-eb193ed99d40/bin/utaipan-eEHZpOm5b7/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd6fd660-d188-4f34-93aa-eb193ed99d40/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_dd6fd660-d188-4f34-93aa-eb193ed99d40/bin/utaipan-eEHZpOm5b7/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd6fd660-d188-4f34-93aa-eb193ed99d40/bin/utaipan-eEHZpOm5b7/config/TaipanReach.xml -i ../../sv-benchmarks/c/loop-acceleration/array_3-2.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd6fd660-d188-4f34-93aa-eb193ed99d40/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_dd6fd660-d188-4f34-93aa-eb193ed99d40/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 42bdab47928922c9249a376933fe7b7a33d855d426cfe04eb271066ef5c44d0a --- Real Ultimate output --- This is Ultimate 0.2.2-hotfix-svcomp22-839c364 [2021-11-25 19:39:13,982 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-25 19:39:13,985 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-25 19:39:14,055 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-25 19:39:14,056 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-25 19:39:14,062 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-25 19:39:14,065 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-25 19:39:14,070 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-25 19:39:14,073 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-25 19:39:14,083 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-25 19:39:14,084 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-25 19:39:14,087 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-25 19:39:14,088 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-25 19:39:14,091 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-25 19:39:14,093 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-25 19:39:14,094 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-25 19:39:14,096 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-25 19:39:14,097 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-25 19:39:14,100 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-25 19:39:14,103 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-25 19:39:14,105 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-25 19:39:14,107 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-25 19:39:14,110 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-25 19:39:14,111 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-25 19:39:14,116 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-25 19:39:14,117 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-25 19:39:14,117 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-25 19:39:14,119 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-25 19:39:14,119 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-25 19:39:14,121 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-25 19:39:14,121 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-25 19:39:14,123 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-25 19:39:14,124 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-25 19:39:14,125 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-25 19:39:14,127 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-25 19:39:14,127 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-25 19:39:14,129 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-25 19:39:14,129 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-25 19:39:14,130 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-25 19:39:14,131 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-25 19:39:14,132 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-25 19:39:14,133 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd6fd660-d188-4f34-93aa-eb193ed99d40/bin/utaipan-eEHZpOm5b7/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-25 19:39:14,173 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-25 19:39:14,174 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-25 19:39:14,174 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-25 19:39:14,174 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-25 19:39:14,175 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-25 19:39:14,176 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-25 19:39:14,176 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-25 19:39:14,184 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-25 19:39:14,184 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-25 19:39:14,184 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-25 19:39:14,186 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-25 19:39:14,186 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-25 19:39:14,186 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-25 19:39:14,187 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-25 19:39:14,187 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-25 19:39:14,187 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-25 19:39:14,188 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-25 19:39:14,188 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-25 19:39:14,189 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-25 19:39:14,189 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-25 19:39:14,190 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-25 19:39:14,190 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-25 19:39:14,190 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-25 19:39:14,191 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-25 19:39:14,192 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-25 19:39:14,192 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-25 19:39:14,194 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-25 19:39:14,194 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-25 19:39:14,194 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-25 19:39:14,195 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-25 19:39:14,195 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-25 19:39:14,196 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-25 19:39:14,196 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-25 19:39:14,196 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-25 19:39:14,197 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-25 19:39:14,197 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-25 19:39:14,197 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-25 19:39:14,198 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-25 19:39:14,198 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-25 19:39:14,198 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-25 19:39:14,199 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-25 19:39:14,199 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_dd6fd660-d188-4f34-93aa-eb193ed99d40/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd6fd660-d188-4f34-93aa-eb193ed99d40/bin/utaipan-eEHZpOm5b7 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 42bdab47928922c9249a376933fe7b7a33d855d426cfe04eb271066ef5c44d0a [2021-11-25 19:39:14,520 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-25 19:39:14,552 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-25 19:39:14,555 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-25 19:39:14,557 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-25 19:39:14,558 INFO L275 PluginConnector]: CDTParser initialized [2021-11-25 19:39:14,559 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd6fd660-d188-4f34-93aa-eb193ed99d40/bin/utaipan-eEHZpOm5b7/../../sv-benchmarks/c/loop-acceleration/array_3-2.i [2021-11-25 19:39:14,655 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd6fd660-d188-4f34-93aa-eb193ed99d40/bin/utaipan-eEHZpOm5b7/data/a6fe1a98a/566d41d88dd849e9842bfd95938d8bc3/FLAG50fe8685c [2021-11-25 19:39:15,193 INFO L306 CDTParser]: Found 1 translation units. [2021-11-25 19:39:15,195 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd6fd660-d188-4f34-93aa-eb193ed99d40/sv-benchmarks/c/loop-acceleration/array_3-2.i [2021-11-25 19:39:15,208 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd6fd660-d188-4f34-93aa-eb193ed99d40/bin/utaipan-eEHZpOm5b7/data/a6fe1a98a/566d41d88dd849e9842bfd95938d8bc3/FLAG50fe8685c [2021-11-25 19:39:15,528 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd6fd660-d188-4f34-93aa-eb193ed99d40/bin/utaipan-eEHZpOm5b7/data/a6fe1a98a/566d41d88dd849e9842bfd95938d8bc3 [2021-11-25 19:39:15,532 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-25 19:39:15,533 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-25 19:39:15,535 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-25 19:39:15,535 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-25 19:39:15,538 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-25 19:39:15,539 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 07:39:15" (1/1) ... [2021-11-25 19:39:15,540 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@75e88c6a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:39:15, skipping insertion in model container [2021-11-25 19:39:15,541 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 07:39:15" (1/1) ... [2021-11-25 19:39:15,559 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-25 19:39:15,574 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-25 19:39:15,795 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_dd6fd660-d188-4f34-93aa-eb193ed99d40/sv-benchmarks/c/loop-acceleration/array_3-2.i[809,822] [2021-11-25 19:39:15,808 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-25 19:39:15,816 INFO L203 MainTranslator]: Completed pre-run [2021-11-25 19:39:15,831 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd6fd660-d188-4f34-93aa-eb193ed99d40/sv-benchmarks/c/loop-acceleration/array_3-2.i[809,822] [2021-11-25 19:39:15,836 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-25 19:39:15,851 INFO L208 MainTranslator]: Completed translation [2021-11-25 19:39:15,852 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:39:15 WrapperNode [2021-11-25 19:39:15,852 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-25 19:39:15,853 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-25 19:39:15,853 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-25 19:39:15,854 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-25 19:39:15,862 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:39:15" (1/1) ... [2021-11-25 19:39:15,869 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:39:15" (1/1) ... [2021-11-25 19:39:15,889 INFO L137 Inliner]: procedures = 16, calls = 11, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 47 [2021-11-25 19:39:15,890 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-25 19:39:15,891 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-25 19:39:15,891 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-25 19:39:15,891 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-25 19:39:15,901 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:39:15" (1/1) ... [2021-11-25 19:39:15,901 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:39:15" (1/1) ... [2021-11-25 19:39:15,903 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:39:15" (1/1) ... [2021-11-25 19:39:15,903 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:39:15" (1/1) ... [2021-11-25 19:39:15,908 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:39:15" (1/1) ... [2021-11-25 19:39:15,913 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:39:15" (1/1) ... [2021-11-25 19:39:15,914 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:39:15" (1/1) ... [2021-11-25 19:39:15,916 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-25 19:39:15,917 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-25 19:39:15,918 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-25 19:39:15,918 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-25 19:39:15,919 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:39:15" (1/1) ... [2021-11-25 19:39:15,927 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-25 19:39:15,939 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd6fd660-d188-4f34-93aa-eb193ed99d40/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:39:15,953 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd6fd660-d188-4f34-93aa-eb193ed99d40/bin/utaipan-eEHZpOm5b7/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-25 19:39:15,976 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd6fd660-d188-4f34-93aa-eb193ed99d40/bin/utaipan-eEHZpOm5b7/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-25 19:39:16,018 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-25 19:39:16,020 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-25 19:39:16,020 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-11-25 19:39:16,020 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-11-25 19:39:16,020 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-25 19:39:16,020 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-25 19:39:16,021 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-11-25 19:39:16,021 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-11-25 19:39:16,107 INFO L236 CfgBuilder]: Building ICFG [2021-11-25 19:39:16,109 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-25 19:39:16,265 INFO L277 CfgBuilder]: Performing block encoding [2021-11-25 19:39:16,291 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-25 19:39:16,292 INFO L301 CfgBuilder]: Removed 2 assume(true) statements. [2021-11-25 19:39:16,294 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 07:39:16 BoogieIcfgContainer [2021-11-25 19:39:16,294 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-25 19:39:16,296 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-25 19:39:16,297 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-25 19:39:16,300 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-25 19:39:16,301 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 25.11 07:39:15" (1/3) ... [2021-11-25 19:39:16,302 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@51ba2080 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 07:39:16, skipping insertion in model container [2021-11-25 19:39:16,302 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 07:39:15" (2/3) ... [2021-11-25 19:39:16,302 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@51ba2080 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 07:39:16, skipping insertion in model container [2021-11-25 19:39:16,302 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 07:39:16" (3/3) ... [2021-11-25 19:39:16,304 INFO L111 eAbstractionObserver]: Analyzing ICFG array_3-2.i [2021-11-25 19:39:16,310 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-25 19:39:16,311 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-25 19:39:16,368 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-25 19:39:16,376 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 19:39:16,377 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-25 19:39:16,392 INFO L276 IsEmpty]: Start isEmpty. Operand has 10 states, 8 states have (on average 1.625) internal successors, (13), 9 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 19:39:16,398 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2021-11-25 19:39:16,398 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:39:16,399 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2021-11-25 19:39:16,400 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:39:16,406 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:39:16,407 INFO L85 PathProgramCache]: Analyzing trace with hash -1804998677, now seen corresponding path program 1 times [2021-11-25 19:39:16,418 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:39:16,419 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1187037311] [2021-11-25 19:39:16,419 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:39:16,420 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:39:16,537 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:39:16,634 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 19:39:16,635 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:39:16,635 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1187037311] [2021-11-25 19:39:16,636 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1187037311] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:39:16,637 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:39:16,637 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-25 19:39:16,639 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1427610958] [2021-11-25 19:39:16,640 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:39:16,644 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2021-11-25 19:39:16,660 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:39:16,720 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2021-11-25 19:39:16,751 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-11-25 19:39:16,754 INFO L87 Difference]: Start difference. First operand has 10 states, 8 states have (on average 1.625) internal successors, (13), 9 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) Second operand has 2 states, 2 states have (on average 3.0) 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 19:39:16,810 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:39:16,811 INFO L93 Difference]: Finished difference Result 16 states and 19 transitions. [2021-11-25 19:39:16,819 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2021-11-25 19:39:16,821 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 3.0) 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 19:39:16,821 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:39:16,830 INFO L225 Difference]: With dead ends: 16 [2021-11-25 19:39:16,831 INFO L226 Difference]: Without dead ends: 8 [2021-11-25 19:39:16,843 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-11-25 19:39:16,851 INFO L933 BasicCegarLoop]: 5 mSDtfsCounter, 0 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 6 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 5 SdHoareTripleChecker+Invalid, 6 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 6 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-25 19:39:16,854 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 5 Invalid, 6 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 6 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-25 19:39:16,875 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8 states. [2021-11-25 19:39:16,887 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8 to 8. [2021-11-25 19:39:16,889 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 8 states, 7 states have (on average 1.2857142857142858) internal successors, (9), 7 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:39:16,891 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8 states to 8 states and 9 transitions. [2021-11-25 19:39:16,893 INFO L78 Accepts]: Start accepts. Automaton has 8 states and 9 transitions. Word has length 6 [2021-11-25 19:39:16,893 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:39:16,894 INFO L470 AbstractCegarLoop]: Abstraction has 8 states and 9 transitions. [2021-11-25 19:39:16,894 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 3.0) 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 19:39:16,894 INFO L276 IsEmpty]: Start isEmpty. Operand 8 states and 9 transitions. [2021-11-25 19:39:16,895 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2021-11-25 19:39:16,896 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:39:16,896 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:39:16,897 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-25 19:39:16,898 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:39:16,902 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:39:16,903 INFO L85 PathProgramCache]: Analyzing trace with hash -99384387, now seen corresponding path program 1 times [2021-11-25 19:39:16,903 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:39:16,904 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2079703427] [2021-11-25 19:39:16,905 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:39:16,905 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:39:16,948 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:39:16,994 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 19:39:16,994 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:39:16,995 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2079703427] [2021-11-25 19:39:16,995 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2079703427] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:39:16,996 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 19:39:16,996 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-25 19:39:16,996 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1665427655] [2021-11-25 19:39:16,997 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:39:16,999 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 19:39:17,001 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:39:17,002 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 19:39:17,003 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 19:39:17,003 INFO L87 Difference]: Start difference. First operand 8 states and 9 transitions. Second operand has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 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 19:39:17,048 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:39:17,049 INFO L93 Difference]: Finished difference Result 21 states and 23 transitions. [2021-11-25 19:39:17,050 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 19:39:17,052 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 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 19:39:17,052 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:39:17,053 INFO L225 Difference]: With dead ends: 21 [2021-11-25 19:39:17,053 INFO L226 Difference]: Without dead ends: 15 [2021-11-25 19:39:17,059 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 19:39:17,064 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 5 mSDsluCounter, 3 mSDsCounter, 0 mSdLazyCounter, 10 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 6 SdHoareTripleChecker+Invalid, 11 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 10 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-25 19:39:17,066 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [5 Valid, 6 Invalid, 11 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 10 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-25 19:39:17,070 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2021-11-25 19:39:17,076 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 9. [2021-11-25 19:39:17,077 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 9 states, 8 states have (on average 1.25) internal successors, (10), 8 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:39:17,078 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9 states to 9 states and 10 transitions. [2021-11-25 19:39:17,079 INFO L78 Accepts]: Start accepts. Automaton has 9 states and 10 transitions. Word has length 7 [2021-11-25 19:39:17,079 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:39:17,081 INFO L470 AbstractCegarLoop]: Abstraction has 9 states and 10 transitions. [2021-11-25 19:39:17,082 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 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 19:39:17,082 INFO L276 IsEmpty]: Start isEmpty. Operand 9 states and 10 transitions. [2021-11-25 19:39:17,083 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2021-11-25 19:39:17,089 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:39:17,089 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:39:17,090 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-11-25 19:39:17,090 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:39:17,091 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:39:17,092 INFO L85 PathProgramCache]: Analyzing trace with hash -1507211673, now seen corresponding path program 1 times [2021-11-25 19:39:17,092 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:39:17,094 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [250214339] [2021-11-25 19:39:17,094 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:39:17,096 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:39:17,116 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:39:17,175 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 19:39:17,175 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:39:17,175 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [250214339] [2021-11-25 19:39:17,176 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [250214339] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:39:17,176 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [527414694] [2021-11-25 19:39:17,177 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:39:17,177 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:39:17,178 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd6fd660-d188-4f34-93aa-eb193ed99d40/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:39:17,180 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd6fd660-d188-4f34-93aa-eb193ed99d40/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:39:17,200 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd6fd660-d188-4f34-93aa-eb193ed99d40/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-25 19:39:17,257 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:39:17,260 INFO L263 TraceCheckSpWp]: Trace formula consists of 57 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-25 19:39:17,266 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:39:17,330 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 19:39:17,330 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:39:17,364 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 19:39:17,365 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [527414694] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:39:17,365 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1046560893] [2021-11-25 19:39:17,385 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-25 19:39:17,386 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 19:39:17,390 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 19:39:17,404 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 19:39:17,405 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 19:39:17,488 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:39:17,522 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-25 19:39:17,523 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2021-11-25 19:39:17,539 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:39:17,541 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 22 [2021-11-25 19:39:17,600 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:39:17,603 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2021-11-25 19:39:17,831 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:39:17,834 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:39:17,837 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:39:17,853 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-25 19:39:17,854 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 200 treesize of output 188 [2021-11-25 19:39:17,942 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 19:39:18,007 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 19:39:18,156 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSifa [1046560893] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 19:39:18,156 INFO L186 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2021-11-25 19:39:18,157 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [3, 3, 3] total 11 [2021-11-25 19:39:18,158 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [5935242] [2021-11-25 19:39:18,158 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 19:39:18,158 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-25 19:39:18,159 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:39:18,160 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-25 19:39:18,160 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=73, Unknown=0, NotChecked=0, Total=132 [2021-11-25 19:39:18,161 INFO L87 Difference]: Start difference. First operand 9 states and 10 transitions. Second operand has 7 states, 7 states have (on average 1.1428571428571428) internal successors, (8), 6 states have internal predecessors, (8), 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 19:39:18,212 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:39:18,212 INFO L93 Difference]: Finished difference Result 15 states and 16 transitions. [2021-11-25 19:39:18,213 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-25 19:39:18,213 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 1.1428571428571428) internal successors, (8), 6 states have internal predecessors, (8), 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 19:39:18,213 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:39:18,214 INFO L225 Difference]: With dead ends: 15 [2021-11-25 19:39:18,214 INFO L226 Difference]: Without dead ends: 11 [2021-11-25 19:39:18,217 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 15 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 42 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=59, Invalid=73, Unknown=0, NotChecked=0, Total=132 [2021-11-25 19:39:18,221 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 8 mSDsluCounter, 3 mSDsCounter, 0 mSdLazyCounter, 22 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8 SdHoareTripleChecker+Valid, 5 SdHoareTripleChecker+Invalid, 27 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 22 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-25 19:39:18,227 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [8 Valid, 5 Invalid, 27 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 22 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-25 19:39:18,229 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 11 states. [2021-11-25 19:39:18,234 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 11 to 11. [2021-11-25 19:39:18,235 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 11 states, 10 states have (on average 1.2) internal successors, (12), 10 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 19:39:18,235 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11 states to 11 states and 12 transitions. [2021-11-25 19:39:18,236 INFO L78 Accepts]: Start accepts. Automaton has 11 states and 12 transitions. Word has length 8 [2021-11-25 19:39:18,236 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:39:18,239 INFO L470 AbstractCegarLoop]: Abstraction has 11 states and 12 transitions. [2021-11-25 19:39:18,240 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 1.1428571428571428) internal successors, (8), 6 states have internal predecessors, (8), 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 19:39:18,240 INFO L276 IsEmpty]: Start isEmpty. Operand 11 states and 12 transitions. [2021-11-25 19:39:18,240 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2021-11-25 19:39:18,241 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:39:18,241 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:39:18,289 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd6fd660-d188-4f34-93aa-eb193ed99d40/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-25 19:39:18,464 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd6fd660-d188-4f34-93aa-eb193ed99d40/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2021-11-25 19:39:18,465 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:39:18,465 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:39:18,466 INFO L85 PathProgramCache]: Analyzing trace with hash -320276660, now seen corresponding path program 1 times [2021-11-25 19:39:18,466 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:39:18,466 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [815905649] [2021-11-25 19:39:18,466 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:39:18,466 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:39:18,482 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:39:18,508 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-25 19:39:18,508 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:39:18,508 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [815905649] [2021-11-25 19:39:18,509 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [815905649] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:39:18,509 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [26012087] [2021-11-25 19:39:18,509 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:39:18,509 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:39:18,509 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd6fd660-d188-4f34-93aa-eb193ed99d40/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:39:18,510 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd6fd660-d188-4f34-93aa-eb193ed99d40/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:39:18,532 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd6fd660-d188-4f34-93aa-eb193ed99d40/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-25 19:39:18,559 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:39:18,560 INFO L263 TraceCheckSpWp]: Trace formula consists of 62 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-25 19:39:18,561 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:39:18,585 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-25 19:39:18,585 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:39:18,620 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-25 19:39:18,620 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [26012087] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:39:18,620 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [22811316] [2021-11-25 19:39:18,624 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-25 19:39:18,624 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 19:39:18,624 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 19:39:18,625 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 19:39:18,625 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 19:39:18,650 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:39:18,669 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-25 19:39:18,669 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2021-11-25 19:39:18,682 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:39:18,683 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 22 [2021-11-25 19:39:18,730 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:39:18,732 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2021-11-25 19:39:18,829 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:39:18,832 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:39:18,835 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:39:18,851 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-25 19:39:18,852 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 200 treesize of output 188 [2021-11-25 19:39:18,922 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 19:39:19,042 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 19:39:19,149 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '235#(and (<= 0 |ULTIMATE.start_main_~#A~0#1.base|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (ite (<= |ULTIMATE.start_main_~i~0#1| 512) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start_main_~#A~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 19:39:19,152 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 19:39:19,152 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 19:39:19,152 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3, 3] total 6 [2021-11-25 19:39:19,153 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1178243896] [2021-11-25 19:39:19,153 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 19:39:19,153 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-25 19:39:19,153 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:39:19,154 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-25 19:39:19,154 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=60, Unknown=0, NotChecked=0, Total=90 [2021-11-25 19:39:19,154 INFO L87 Difference]: Start difference. First operand 11 states and 12 transitions. Second operand has 7 states, 7 states have (on average 2.0) internal successors, (14), 6 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:39:19,217 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:39:19,217 INFO L93 Difference]: Finished difference Result 40 states and 44 transitions. [2021-11-25 19:39:19,217 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-25 19:39:19,217 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 2.0) internal successors, (14), 6 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 10 [2021-11-25 19:39:19,218 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:39:19,218 INFO L225 Difference]: With dead ends: 40 [2021-11-25 19:39:19,219 INFO L226 Difference]: Without dead ends: 32 [2021-11-25 19:39:19,219 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 21 SyntacticMatches, 2 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 34 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=30, Invalid=60, Unknown=0, NotChecked=0, Total=90 [2021-11-25 19:39:19,220 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 18 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 22 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 18 SdHoareTripleChecker+Valid, 15 SdHoareTripleChecker+Invalid, 31 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 22 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-25 19:39:19,220 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [18 Valid, 15 Invalid, 31 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 22 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-25 19:39:19,221 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2021-11-25 19:39:19,225 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 14. [2021-11-25 19:39:19,225 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 14 states, 13 states have (on average 1.1538461538461537) internal successors, (15), 13 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 19:39:19,226 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 15 transitions. [2021-11-25 19:39:19,226 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 15 transitions. Word has length 10 [2021-11-25 19:39:19,226 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:39:19,226 INFO L470 AbstractCegarLoop]: Abstraction has 14 states and 15 transitions. [2021-11-25 19:39:19,226 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 2.0) internal successors, (14), 6 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:39:19,226 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 15 transitions. [2021-11-25 19:39:19,227 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2021-11-25 19:39:19,227 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:39:19,227 INFO L514 BasicCegarLoop]: trace histogram [4, 2, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 19:39:19,267 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd6fd660-d188-4f34-93aa-eb193ed99d40/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-25 19:39:19,443 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd6fd660-d188-4f34-93aa-eb193ed99d40/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:39:19,443 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:39:19,443 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:39:19,444 INFO L85 PathProgramCache]: Analyzing trace with hash 1870426530, now seen corresponding path program 2 times [2021-11-25 19:39:19,444 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:39:19,444 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1460179481] [2021-11-25 19:39:19,444 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:39:19,444 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:39:19,483 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:39:19,579 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-25 19:39:19,580 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:39:19,580 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1460179481] [2021-11-25 19:39:19,580 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1460179481] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:39:19,580 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2119888753] [2021-11-25 19:39:19,581 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 19:39:19,581 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:39:19,581 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd6fd660-d188-4f34-93aa-eb193ed99d40/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:39:19,585 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd6fd660-d188-4f34-93aa-eb193ed99d40/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:39:19,600 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd6fd660-d188-4f34-93aa-eb193ed99d40/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-25 19:39:19,652 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-11-25 19:39:19,652 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 19:39:19,653 INFO L263 TraceCheckSpWp]: Trace formula consists of 71 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-25 19:39:19,655 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:39:19,718 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-25 19:39:19,718 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:39:19,783 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-25 19:39:19,783 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2119888753] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:39:19,783 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1171385416] [2021-11-25 19:39:19,786 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-25 19:39:19,786 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 19:39:19,787 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 19:39:19,787 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 19:39:19,787 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 19:39:19,808 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:39:19,825 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-25 19:39:19,826 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2021-11-25 19:39:19,838 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:39:19,839 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 22 [2021-11-25 19:39:19,876 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:39:19,878 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2021-11-25 19:39:19,948 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:39:19,949 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:39:19,987 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-25 19:39:19,988 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 190 treesize of output 189 [2021-11-25 19:39:20,087 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 19:39:20,223 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 19:39:20,339 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '392#(and (<= 0 |ULTIMATE.start_main_~#A~0#1.base|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (ite (<= |ULTIMATE.start_main_~i~0#1| 512) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start_main_~#A~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 19:39:20,339 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 19:39:20,339 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 19:39:20,339 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 9 [2021-11-25 19:39:20,339 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1774514694] [2021-11-25 19:39:20,339 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 19:39:20,340 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-25 19:39:20,340 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:39:20,341 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-25 19:39:20,341 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=97, Unknown=0, NotChecked=0, Total=132 [2021-11-25 19:39:20,341 INFO L87 Difference]: Start difference. First operand 14 states and 15 transitions. Second operand has 9 states, 9 states have (on average 2.3333333333333335) internal successors, (21), 9 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:39:20,425 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:39:20,425 INFO L93 Difference]: Finished difference Result 28 states and 31 transitions. [2021-11-25 19:39:20,426 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-25 19:39:20,426 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.3333333333333335) internal successors, (21), 9 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 13 [2021-11-25 19:39:20,426 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:39:20,427 INFO L225 Difference]: With dead ends: 28 [2021-11-25 19:39:20,427 INFO L226 Difference]: Without dead ends: 20 [2021-11-25 19:39:20,427 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 29 SyntacticMatches, 3 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 56 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=56, Invalid=154, Unknown=0, NotChecked=0, Total=210 [2021-11-25 19:39:20,428 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 5 mSDsluCounter, 20 mSDsCounter, 0 mSdLazyCounter, 36 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 19 SdHoareTripleChecker+Invalid, 46 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 36 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-25 19:39:20,428 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [5 Valid, 19 Invalid, 46 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 36 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-25 19:39:20,429 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2021-11-25 19:39:20,432 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2021-11-25 19:39:20,433 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20 states, 19 states have (on average 1.105263157894737) internal successors, (21), 19 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:39:20,433 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 21 transitions. [2021-11-25 19:39:20,434 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 21 transitions. Word has length 13 [2021-11-25 19:39:20,434 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:39:20,434 INFO L470 AbstractCegarLoop]: Abstraction has 20 states and 21 transitions. [2021-11-25 19:39:20,434 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 2.3333333333333335) internal successors, (21), 9 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:39:20,434 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 21 transitions. [2021-11-25 19:39:20,435 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2021-11-25 19:39:20,435 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:39:20,436 INFO L514 BasicCegarLoop]: trace histogram [5, 4, 4, 1, 1, 1, 1, 1, 1] [2021-11-25 19:39:20,480 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd6fd660-d188-4f34-93aa-eb193ed99d40/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-25 19:39:20,652 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd6fd660-d188-4f34-93aa-eb193ed99d40/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:39:20,653 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:39:20,653 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:39:20,653 INFO L85 PathProgramCache]: Analyzing trace with hash -11023279, now seen corresponding path program 3 times [2021-11-25 19:39:20,653 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:39:20,653 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [81025272] [2021-11-25 19:39:20,653 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:39:20,654 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:39:20,695 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:39:20,754 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2021-11-25 19:39:20,754 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:39:20,754 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [81025272] [2021-11-25 19:39:20,754 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [81025272] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:39:20,754 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [682031946] [2021-11-25 19:39:20,755 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 19:39:20,755 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:39:20,755 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd6fd660-d188-4f34-93aa-eb193ed99d40/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:39:20,756 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd6fd660-d188-4f34-93aa-eb193ed99d40/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:39:20,812 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd6fd660-d188-4f34-93aa-eb193ed99d40/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-25 19:39:20,878 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 19:39:20,878 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 19:39:20,879 INFO L263 TraceCheckSpWp]: Trace formula consists of 104 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-25 19:39:20,881 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:39:20,930 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2021-11-25 19:39:20,930 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:39:21,040 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2021-11-25 19:39:21,040 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [682031946] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:39:21,040 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [318407444] [2021-11-25 19:39:21,043 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-25 19:39:21,043 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 19:39:21,043 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 19:39:21,044 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 19:39:21,044 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 19:39:21,059 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:39:21,073 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-25 19:39:21,074 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2021-11-25 19:39:21,083 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:39:21,085 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 22 [2021-11-25 19:39:21,118 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:39:21,120 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2021-11-25 19:39:21,179 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:39:21,180 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:39:21,205 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-25 19:39:21,206 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 190 treesize of output 189 [2021-11-25 19:39:21,333 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 19:39:21,431 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 19:39:21,583 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '590#(and (<= 0 |ULTIMATE.start_main_~#A~0#1.base|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (ite (<= |ULTIMATE.start_main_~i~0#1| 512) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start_main_~#A~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 19:39:21,583 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 19:39:21,584 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 19:39:21,584 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 12 [2021-11-25 19:39:21,584 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [22435944] [2021-11-25 19:39:21,584 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 19:39:21,585 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2021-11-25 19:39:21,585 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:39:21,585 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-11-25 19:39:21,585 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=87, Invalid=153, Unknown=0, NotChecked=0, Total=240 [2021-11-25 19:39:21,586 INFO L87 Difference]: Start difference. First operand 20 states and 21 transitions. Second operand has 13 states, 13 states have (on average 1.5384615384615385) internal successors, (20), 12 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:39:21,677 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:39:21,678 INFO L93 Difference]: Finished difference Result 76 states and 83 transitions. [2021-11-25 19:39:21,678 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-25 19:39:21,678 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 1.5384615384615385) internal successors, (20), 12 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 19 [2021-11-25 19:39:21,679 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:39:21,679 INFO L225 Difference]: With dead ends: 76 [2021-11-25 19:39:21,680 INFO L226 Difference]: Without dead ends: 62 [2021-11-25 19:39:21,680 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 42 SyntacticMatches, 5 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 136 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=87, Invalid=153, Unknown=0, NotChecked=0, Total=240 [2021-11-25 19:39:21,682 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 63 mSDsluCounter, 21 mSDsCounter, 0 mSdLazyCounter, 43 mSolverCounterSat, 26 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 63 SdHoareTripleChecker+Valid, 24 SdHoareTripleChecker+Invalid, 69 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 26 IncrementalHoareTripleChecker+Valid, 43 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 19:39:21,682 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [63 Valid, 24 Invalid, 69 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [26 Valid, 43 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 19:39:21,683 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2021-11-25 19:39:21,690 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 26. [2021-11-25 19:39:21,690 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 25 states have (on average 1.08) internal successors, (27), 25 states have internal predecessors, (27), 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 19:39:21,691 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 27 transitions. [2021-11-25 19:39:21,691 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 27 transitions. Word has length 19 [2021-11-25 19:39:21,691 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:39:21,691 INFO L470 AbstractCegarLoop]: Abstraction has 26 states and 27 transitions. [2021-11-25 19:39:21,692 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 1.5384615384615385) internal successors, (20), 12 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:39:21,692 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 27 transitions. [2021-11-25 19:39:21,693 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2021-11-25 19:39:21,693 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:39:21,693 INFO L514 BasicCegarLoop]: trace histogram [10, 5, 4, 1, 1, 1, 1, 1, 1] [2021-11-25 19:39:21,735 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd6fd660-d188-4f34-93aa-eb193ed99d40/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-25 19:39:21,908 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd6fd660-d188-4f34-93aa-eb193ed99d40/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:39:21,909 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:39:21,909 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:39:21,909 INFO L85 PathProgramCache]: Analyzing trace with hash -1846920175, now seen corresponding path program 4 times [2021-11-25 19:39:21,909 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:39:21,909 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2000382169] [2021-11-25 19:39:21,909 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:39:21,909 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:39:21,951 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:39:22,079 INFO L134 CoverageAnalysis]: Checked inductivity of 75 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2021-11-25 19:39:22,080 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:39:22,080 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2000382169] [2021-11-25 19:39:22,080 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2000382169] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:39:22,080 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [578751966] [2021-11-25 19:39:22,080 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 19:39:22,081 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:39:22,081 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd6fd660-d188-4f34-93aa-eb193ed99d40/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:39:22,082 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd6fd660-d188-4f34-93aa-eb193ed99d40/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:39:22,084 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd6fd660-d188-4f34-93aa-eb193ed99d40/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-25 19:39:22,151 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:39:22,153 INFO L263 TraceCheckSpWp]: Trace formula consists of 158 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-25 19:39:22,154 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:39:22,223 INFO L134 CoverageAnalysis]: Checked inductivity of 75 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2021-11-25 19:39:22,224 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:39:22,460 INFO L134 CoverageAnalysis]: Checked inductivity of 75 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2021-11-25 19:39:22,460 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [578751966] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:39:22,460 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [548674113] [2021-11-25 19:39:22,463 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-25 19:39:22,464 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 19:39:22,464 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 19:39:22,464 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 19:39:22,464 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 19:39:22,483 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:39:22,499 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-25 19:39:22,499 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 17 treesize of output 26 [2021-11-25 19:39:22,512 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:39:22,528 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-25 19:39:22,528 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2021-11-25 19:39:22,549 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:39:22,550 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2021-11-25 19:39:22,600 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:39:22,602 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:39:22,605 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:39:22,618 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-25 19:39:22,619 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 200 treesize of output 188 [2021-11-25 19:39:22,663 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 19:39:22,750 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 19:39:22,944 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '907#(and (<= 0 |ULTIMATE.start_main_~#A~0#1.base|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (ite (<= |ULTIMATE.start_main_~i~0#1| 512) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start_main_~#A~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 19:39:22,944 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 19:39:22,945 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 19:39:22,945 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12] total 24 [2021-11-25 19:39:22,945 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [653518182] [2021-11-25 19:39:22,945 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 19:39:22,945 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2021-11-25 19:39:22,946 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:39:22,946 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-11-25 19:39:22,947 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=309, Invalid=447, Unknown=0, NotChecked=0, Total=756 [2021-11-25 19:39:22,947 INFO L87 Difference]: Start difference. First operand 26 states and 27 transitions. Second operand has 25 states, 25 states have (on average 1.28) internal successors, (32), 24 states have internal predecessors, (32), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:39:23,174 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:39:23,174 INFO L93 Difference]: Finished difference Result 160 states and 173 transitions. [2021-11-25 19:39:23,174 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-11-25 19:39:23,175 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 1.28) internal successors, (32), 24 states have internal predecessors, (32), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 25 [2021-11-25 19:39:23,175 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:39:23,176 INFO L225 Difference]: With dead ends: 160 [2021-11-25 19:39:23,177 INFO L226 Difference]: Without dead ends: 146 [2021-11-25 19:39:23,177 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 54 SyntacticMatches, 5 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 304 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=309, Invalid=447, Unknown=0, NotChecked=0, Total=756 [2021-11-25 19:39:23,178 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 219 mSDsluCounter, 63 mSDsCounter, 0 mSdLazyCounter, 96 mSolverCounterSat, 70 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 219 SdHoareTripleChecker+Valid, 66 SdHoareTripleChecker+Invalid, 166 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 70 IncrementalHoareTripleChecker+Valid, 96 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 19:39:23,179 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [219 Valid, 66 Invalid, 166 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [70 Valid, 96 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-25 19:39:23,180 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 146 states. [2021-11-25 19:39:23,188 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 146 to 38. [2021-11-25 19:39:23,189 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 38 states, 37 states have (on average 1.054054054054054) internal successors, (39), 37 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:39:23,190 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 39 transitions. [2021-11-25 19:39:23,190 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 39 transitions. Word has length 25 [2021-11-25 19:39:23,190 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:39:23,190 INFO L470 AbstractCegarLoop]: Abstraction has 38 states and 39 transitions. [2021-11-25 19:39:23,191 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 25 states have (on average 1.28) internal successors, (32), 24 states have internal predecessors, (32), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:39:23,191 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 39 transitions. [2021-11-25 19:39:23,192 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2021-11-25 19:39:23,192 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:39:23,192 INFO L514 BasicCegarLoop]: trace histogram [22, 5, 4, 1, 1, 1, 1, 1, 1] [2021-11-25 19:39:23,225 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd6fd660-d188-4f34-93aa-eb193ed99d40/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Ended with exit code 0 [2021-11-25 19:39:23,420 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd6fd660-d188-4f34-93aa-eb193ed99d40/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:39:23,421 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:39:23,421 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:39:23,421 INFO L85 PathProgramCache]: Analyzing trace with hash -385700975, now seen corresponding path program 5 times [2021-11-25 19:39:23,421 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:39:23,421 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [464164758] [2021-11-25 19:39:23,421 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:39:23,422 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:39:23,486 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:39:23,833 INFO L134 CoverageAnalysis]: Checked inductivity of 273 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2021-11-25 19:39:23,833 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:39:23,833 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [464164758] [2021-11-25 19:39:23,834 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [464164758] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:39:23,834 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [61306732] [2021-11-25 19:39:23,834 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 19:39:23,834 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:39:23,834 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd6fd660-d188-4f34-93aa-eb193ed99d40/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:39:23,838 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd6fd660-d188-4f34-93aa-eb193ed99d40/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:39:23,868 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd6fd660-d188-4f34-93aa-eb193ed99d40/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-25 19:39:23,943 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2021-11-25 19:39:23,944 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 19:39:23,945 INFO L263 TraceCheckSpWp]: Trace formula consists of 140 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-25 19:39:23,947 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:39:24,061 INFO L134 CoverageAnalysis]: Checked inductivity of 273 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 253 trivial. 0 not checked. [2021-11-25 19:39:24,062 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:39:24,319 INFO L134 CoverageAnalysis]: Checked inductivity of 273 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 253 trivial. 0 not checked. [2021-11-25 19:39:24,319 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [61306732] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:39:24,319 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [725300242] [2021-11-25 19:39:24,322 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-25 19:39:24,322 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 19:39:24,322 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 19:39:24,322 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 19:39:24,323 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 19:39:24,345 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:39:24,361 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-25 19:39:24,362 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2021-11-25 19:39:24,373 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:39:24,375 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 22 [2021-11-25 19:39:24,403 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:39:24,404 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2021-11-25 19:39:24,455 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:39:24,457 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:39:24,460 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:39:24,475 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-25 19:39:24,475 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 200 treesize of output 188 [2021-11-25 19:39:24,529 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 19:39:24,624 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 19:39:24,945 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1435#(and (<= 0 |ULTIMATE.start_main_~#A~0#1.base|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (ite (<= |ULTIMATE.start_main_~i~0#1| 512) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start_main_~#A~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 19:39:24,945 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 19:39:24,945 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 19:39:24,945 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 8, 8] total 32 [2021-11-25 19:39:24,946 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1108919157] [2021-11-25 19:39:24,946 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 19:39:24,947 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2021-11-25 19:39:24,947 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:39:24,947 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2021-11-25 19:39:24,948 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=476, Invalid=714, Unknown=0, NotChecked=0, Total=1190 [2021-11-25 19:39:24,949 INFO L87 Difference]: Start difference. First operand 38 states and 39 transitions. Second operand has 32 states, 32 states have (on average 1.78125) internal successors, (57), 32 states have internal predecessors, (57), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:39:25,739 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:39:25,739 INFO L93 Difference]: Finished difference Result 154 states and 185 transitions. [2021-11-25 19:39:25,740 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 54 states. [2021-11-25 19:39:25,740 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 1.78125) internal successors, (57), 32 states have internal predecessors, (57), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 37 [2021-11-25 19:39:25,740 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:39:25,741 INFO L225 Difference]: With dead ends: 154 [2021-11-25 19:39:25,741 INFO L226 Difference]: Without dead ends: 92 [2021-11-25 19:39:25,744 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 157 GetRequests, 94 SyntacticMatches, 6 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 694 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=1124, Invalid=2298, Unknown=0, NotChecked=0, Total=3422 [2021-11-25 19:39:25,745 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 187 mSDsluCounter, 41 mSDsCounter, 0 mSdLazyCounter, 127 mSolverCounterSat, 107 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 187 SdHoareTripleChecker+Valid, 42 SdHoareTripleChecker+Invalid, 234 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 107 IncrementalHoareTripleChecker+Valid, 127 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 19:39:25,745 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [187 Valid, 42 Invalid, 234 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [107 Valid, 127 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-25 19:39:25,746 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 92 states. [2021-11-25 19:39:25,765 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 92 to 92. [2021-11-25 19:39:25,766 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 92 states, 91 states have (on average 1.021978021978022) internal successors, (93), 91 states have internal predecessors, (93), 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 19:39:25,768 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 92 states to 92 states and 93 transitions. [2021-11-25 19:39:25,768 INFO L78 Accepts]: Start accepts. Automaton has 92 states and 93 transitions. Word has length 37 [2021-11-25 19:39:25,768 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:39:25,768 INFO L470 AbstractCegarLoop]: Abstraction has 92 states and 93 transitions. [2021-11-25 19:39:25,769 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 32 states have (on average 1.78125) internal successors, (57), 32 states have internal predecessors, (57), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 19:39:25,769 INFO L276 IsEmpty]: Start isEmpty. Operand 92 states and 93 transitions. [2021-11-25 19:39:25,772 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 92 [2021-11-25 19:39:25,773 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:39:25,773 INFO L514 BasicCegarLoop]: trace histogram [29, 28, 28, 1, 1, 1, 1, 1, 1] [2021-11-25 19:39:25,799 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd6fd660-d188-4f34-93aa-eb193ed99d40/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-25 19:39:25,980 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd6fd660-d188-4f34-93aa-eb193ed99d40/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable7 [2021-11-25 19:39:25,981 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:39:25,981 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:39:25,981 INFO L85 PathProgramCache]: Analyzing trace with hash -1548067895, now seen corresponding path program 6 times [2021-11-25 19:39:25,981 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:39:25,982 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1478087165] [2021-11-25 19:39:25,982 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:39:25,982 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:39:26,176 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:39:26,656 INFO L134 CoverageAnalysis]: Checked inductivity of 1218 backedges. 0 proven. 406 refuted. 0 times theorem prover too weak. 812 trivial. 0 not checked. [2021-11-25 19:39:26,656 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:39:26,656 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1478087165] [2021-11-25 19:39:26,656 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1478087165] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:39:26,656 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1993052716] [2021-11-25 19:39:26,656 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 19:39:26,656 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:39:26,657 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd6fd660-d188-4f34-93aa-eb193ed99d40/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:39:26,657 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd6fd660-d188-4f34-93aa-eb193ed99d40/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:39:26,662 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd6fd660-d188-4f34-93aa-eb193ed99d40/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-25 19:39:26,805 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 19:39:26,805 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 19:39:26,809 INFO L263 TraceCheckSpWp]: Trace formula consists of 440 conjuncts, 30 conjunts are in the unsatisfiable core [2021-11-25 19:39:26,814 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:39:27,039 INFO L134 CoverageAnalysis]: Checked inductivity of 1218 backedges. 0 proven. 406 refuted. 0 times theorem prover too weak. 812 trivial. 0 not checked. [2021-11-25 19:39:27,039 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:39:28,222 INFO L134 CoverageAnalysis]: Checked inductivity of 1218 backedges. 0 proven. 406 refuted. 0 times theorem prover too weak. 812 trivial. 0 not checked. [2021-11-25 19:39:28,222 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1993052716] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:39:28,223 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [48699220] [2021-11-25 19:39:28,225 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-25 19:39:28,225 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 19:39:28,225 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 19:39:28,225 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 19:39:28,226 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 19:39:28,253 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:39:28,269 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-25 19:39:28,269 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2021-11-25 19:39:28,281 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:39:28,282 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 22 [2021-11-25 19:39:28,304 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:39:28,306 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2021-11-25 19:39:28,361 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:39:28,363 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:39:28,367 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:39:28,381 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-25 19:39:28,381 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 200 treesize of output 188 [2021-11-25 19:39:28,423 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 19:39:28,509 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 19:39:29,491 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2454#(and (<= 0 |ULTIMATE.start_main_~#A~0#1.base|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (ite (<= |ULTIMATE.start_main_~i~0#1| 512) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start_main_~#A~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 19:39:29,491 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 19:39:29,491 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 19:39:29,492 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 30, 30] total 60 [2021-11-25 19:39:29,492 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [73039738] [2021-11-25 19:39:29,492 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 19:39:29,493 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 61 states [2021-11-25 19:39:29,493 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:39:29,494 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 61 interpolants. [2021-11-25 19:39:29,496 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1839, Invalid=2193, Unknown=0, NotChecked=0, Total=4032 [2021-11-25 19:39:29,497 INFO L87 Difference]: Start difference. First operand 92 states and 93 transitions. Second operand has 61 states, 61 states have (on average 1.1147540983606556) internal successors, (68), 60 states have internal predecessors, (68), 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 19:39:30,133 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:39:30,133 INFO L93 Difference]: Finished difference Result 364 states and 395 transitions. [2021-11-25 19:39:30,134 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 60 states. [2021-11-25 19:39:30,134 INFO L78 Accepts]: Start accepts. Automaton has has 61 states, 61 states have (on average 1.1147540983606556) internal successors, (68), 60 states have internal predecessors, (68), 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 91 [2021-11-25 19:39:30,134 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:39:30,136 INFO L225 Difference]: With dead ends: 364 [2021-11-25 19:39:30,136 INFO L226 Difference]: Without dead ends: 302 [2021-11-25 19:39:30,138 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 301 GetRequests, 210 SyntacticMatches, 29 SemanticMatches, 62 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2896 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=1839, Invalid=2193, Unknown=0, NotChecked=0, Total=4032 [2021-11-25 19:39:30,139 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 522 mSDsluCounter, 105 mSDsCounter, 0 mSdLazyCounter, 218 mSolverCounterSat, 196 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 522 SdHoareTripleChecker+Valid, 108 SdHoareTripleChecker+Invalid, 414 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 196 IncrementalHoareTripleChecker+Valid, 218 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-25 19:39:30,139 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [522 Valid, 108 Invalid, 414 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [196 Valid, 218 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-25 19:39:30,140 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 302 states. [2021-11-25 19:39:30,168 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 302 to 122. [2021-11-25 19:39:30,169 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 122 states, 121 states have (on average 1.0165289256198347) internal successors, (123), 121 states have internal predecessors, (123), 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 19:39:30,170 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 122 states to 122 states and 123 transitions. [2021-11-25 19:39:30,171 INFO L78 Accepts]: Start accepts. Automaton has 122 states and 123 transitions. Word has length 91 [2021-11-25 19:39:30,171 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:39:30,171 INFO L470 AbstractCegarLoop]: Abstraction has 122 states and 123 transitions. [2021-11-25 19:39:30,172 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 61 states, 61 states have (on average 1.1147540983606556) internal successors, (68), 60 states have internal predecessors, (68), 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 19:39:30,172 INFO L276 IsEmpty]: Start isEmpty. Operand 122 states and 123 transitions. [2021-11-25 19:39:30,177 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 122 [2021-11-25 19:39:30,182 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:39:30,182 INFO L514 BasicCegarLoop]: trace histogram [58, 29, 28, 1, 1, 1, 1, 1, 1] [2021-11-25 19:39:30,223 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd6fd660-d188-4f34-93aa-eb193ed99d40/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-11-25 19:39:30,397 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd6fd660-d188-4f34-93aa-eb193ed99d40/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable8 [2021-11-25 19:39:30,398 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:39:30,398 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:39:30,398 INFO L85 PathProgramCache]: Analyzing trace with hash -1453217143, now seen corresponding path program 7 times [2021-11-25 19:39:30,399 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:39:30,399 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [784001323] [2021-11-25 19:39:30,399 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:39:30,399 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:39:30,538 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:39:32,160 INFO L134 CoverageAnalysis]: Checked inductivity of 2523 backedges. 0 proven. 1711 refuted. 0 times theorem prover too weak. 812 trivial. 0 not checked. [2021-11-25 19:39:32,161 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:39:32,161 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [784001323] [2021-11-25 19:39:32,161 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [784001323] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:39:32,161 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [315257008] [2021-11-25 19:39:32,162 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 19:39:32,162 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:39:32,162 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd6fd660-d188-4f34-93aa-eb193ed99d40/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:39:32,165 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd6fd660-d188-4f34-93aa-eb193ed99d40/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:39:32,189 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd6fd660-d188-4f34-93aa-eb193ed99d40/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-11-25 19:39:32,387 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:39:32,392 INFO L263 TraceCheckSpWp]: Trace formula consists of 710 conjuncts, 60 conjunts are in the unsatisfiable core [2021-11-25 19:39:32,404 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:39:32,657 INFO L134 CoverageAnalysis]: Checked inductivity of 2523 backedges. 0 proven. 1711 refuted. 0 times theorem prover too weak. 812 trivial. 0 not checked. [2021-11-25 19:39:32,657 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:39:36,602 INFO L134 CoverageAnalysis]: Checked inductivity of 2523 backedges. 0 proven. 1711 refuted. 0 times theorem prover too weak. 812 trivial. 0 not checked. [2021-11-25 19:39:36,602 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [315257008] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:39:36,602 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [200890426] [2021-11-25 19:39:36,604 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-25 19:39:36,604 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 19:39:36,605 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 19:39:36,605 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 19:39:36,605 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 19:39:36,625 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:39:36,636 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-25 19:39:36,636 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 17 treesize of output 26 [2021-11-25 19:39:36,645 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:39:36,660 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-25 19:39:36,660 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2021-11-25 19:39:36,694 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:39:36,695 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2021-11-25 19:39:36,746 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:39:36,747 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:39:36,767 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-25 19:39:36,767 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 190 treesize of output 189 [2021-11-25 19:39:36,885 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 19:39:36,963 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 19:39:38,502 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4019#(and (<= 0 |ULTIMATE.start_main_~#A~0#1.base|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (ite (<= |ULTIMATE.start_main_~i~0#1| 512) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start_main_~#A~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 19:39:38,502 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 19:39:38,502 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 19:39:38,503 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [60, 60, 60] total 120 [2021-11-25 19:39:38,503 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1169465459] [2021-11-25 19:39:38,503 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 19:39:38,504 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 121 states [2021-11-25 19:39:38,504 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:39:38,507 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 121 interpolants. [2021-11-25 19:39:38,511 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7269, Invalid=7983, Unknown=0, NotChecked=0, Total=15252 [2021-11-25 19:39:38,512 INFO L87 Difference]: Start difference. First operand 122 states and 123 transitions. Second operand has 121 states, 121 states have (on average 1.0578512396694215) internal successors, (128), 120 states have internal predecessors, (128), 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 19:39:41,688 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:39:41,689 INFO L93 Difference]: Finished difference Result 784 states and 845 transitions. [2021-11-25 19:39:41,689 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 120 states. [2021-11-25 19:39:41,689 INFO L78 Accepts]: Start accepts. Automaton has has 121 states, 121 states have (on average 1.0578512396694215) internal successors, (128), 120 states have internal predecessors, (128), 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 121 [2021-11-25 19:39:41,690 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:39:41,693 INFO L225 Difference]: With dead ends: 784 [2021-11-25 19:39:41,693 INFO L226 Difference]: Without dead ends: 722 [2021-11-25 19:39:41,698 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 421 GetRequests, 270 SyntacticMatches, 29 SemanticMatches, 122 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5896 ImplicationChecksByTransitivity, 6.6s TimeCoverageRelationStatistics Valid=7269, Invalid=7983, Unknown=0, NotChecked=0, Total=15252 [2021-11-25 19:39:41,699 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 2347 mSDsluCounter, 282 mSDsCounter, 0 mSdLazyCounter, 457 mSolverCounterSat, 665 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2347 SdHoareTripleChecker+Valid, 285 SdHoareTripleChecker+Invalid, 1122 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 665 IncrementalHoareTripleChecker+Valid, 457 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2021-11-25 19:39:41,699 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2347 Valid, 285 Invalid, 1122 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [665 Valid, 457 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2021-11-25 19:39:41,700 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 722 states. [2021-11-25 19:39:41,731 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 722 to 182. [2021-11-25 19:39:41,732 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 182 states, 181 states have (on average 1.011049723756906) internal successors, (183), 181 states have internal predecessors, (183), 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 19:39:41,735 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 182 states to 182 states and 183 transitions. [2021-11-25 19:39:41,735 INFO L78 Accepts]: Start accepts. Automaton has 182 states and 183 transitions. Word has length 121 [2021-11-25 19:39:41,736 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:39:41,736 INFO L470 AbstractCegarLoop]: Abstraction has 182 states and 183 transitions. [2021-11-25 19:39:41,736 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 121 states, 121 states have (on average 1.0578512396694215) internal successors, (128), 120 states have internal predecessors, (128), 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 19:39:41,737 INFO L276 IsEmpty]: Start isEmpty. Operand 182 states and 183 transitions. [2021-11-25 19:39:41,741 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 182 [2021-11-25 19:39:41,741 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:39:41,741 INFO L514 BasicCegarLoop]: trace histogram [118, 29, 28, 1, 1, 1, 1, 1, 1] [2021-11-25 19:39:41,769 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd6fd660-d188-4f34-93aa-eb193ed99d40/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-11-25 19:39:41,952 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd6fd660-d188-4f34-93aa-eb193ed99d40/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:39:41,953 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:39:41,953 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:39:41,953 INFO L85 PathProgramCache]: Analyzing trace with hash 346642441, now seen corresponding path program 8 times [2021-11-25 19:39:41,953 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:39:41,953 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [407741746] [2021-11-25 19:39:41,953 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:39:41,954 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:39:42,157 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:39:47,442 INFO L134 CoverageAnalysis]: Checked inductivity of 7833 backedges. 0 proven. 7021 refuted. 0 times theorem prover too weak. 812 trivial. 0 not checked. [2021-11-25 19:39:47,442 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:39:47,442 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [407741746] [2021-11-25 19:39:47,442 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [407741746] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:39:47,442 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1745886898] [2021-11-25 19:39:47,442 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 19:39:47,442 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:39:47,442 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd6fd660-d188-4f34-93aa-eb193ed99d40/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:39:47,443 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd6fd660-d188-4f34-93aa-eb193ed99d40/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:39:47,445 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd6fd660-d188-4f34-93aa-eb193ed99d40/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-11-25 19:47:05,513 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 29 check-sat command(s) [2021-11-25 19:47:05,514 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 19:47:05,867 INFO L263 TraceCheckSpWp]: Trace formula consists of 692 conjuncts, 32 conjunts are in the unsatisfiable core [2021-11-25 19:47:05,875 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:47:06,290 INFO L134 CoverageAnalysis]: Checked inductivity of 7833 backedges. 0 proven. 812 refuted. 0 times theorem prover too weak. 7021 trivial. 0 not checked. [2021-11-25 19:47:06,291 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:47:09,536 INFO L134 CoverageAnalysis]: Checked inductivity of 7833 backedges. 0 proven. 812 refuted. 0 times theorem prover too weak. 7021 trivial. 0 not checked. [2021-11-25 19:47:09,537 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1745886898] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:47:09,537 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [552836982] [2021-11-25 19:47:09,544 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-25 19:47:09,544 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 19:47:09,545 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 19:47:09,545 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 19:47:09,545 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 19:47:09,569 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:47:09,586 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-25 19:47:09,587 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2021-11-25 19:47:09,596 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:47:09,597 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 22 [2021-11-25 19:47:09,619 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:47:09,620 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2021-11-25 19:47:09,688 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:47:09,689 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:47:09,711 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-25 19:47:09,712 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 190 treesize of output 189 [2021-11-25 19:47:09,794 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 19:47:09,889 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 19:47:12,869 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '6635#(and (<= 0 |ULTIMATE.start_main_~#A~0#1.base|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (ite (<= |ULTIMATE.start_main_~i~0#1| 512) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start_main_~#A~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 19:47:12,869 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 19:47:12,869 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 19:47:12,869 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [120, 32, 32] total 152 [2021-11-25 19:47:12,869 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1794751300] [2021-11-25 19:47:12,869 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 19:47:12,870 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 152 states [2021-11-25 19:47:12,870 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:47:12,873 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 152 interpolants. [2021-11-25 19:47:12,878 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11336, Invalid=12534, Unknown=0, NotChecked=0, Total=23870 [2021-11-25 19:47:12,878 INFO L87 Difference]: Start difference. First operand 182 states and 183 transitions. Second operand has 152 states, 152 states have (on average 1.638157894736842) internal successors, (249), 152 states have internal predecessors, (249), 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 19:47:24,588 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:47:24,589 INFO L93 Difference]: Finished difference Result 754 states and 905 transitions. [2021-11-25 19:47:24,589 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 270 states. [2021-11-25 19:47:24,589 INFO L78 Accepts]: Start accepts. Automaton has has 152 states, 152 states have (on average 1.638157894736842) internal successors, (249), 152 states have internal predecessors, (249), 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 181 [2021-11-25 19:47:24,590 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:47:24,593 INFO L225 Difference]: With dead ends: 754 [2021-11-25 19:47:24,593 INFO L226 Difference]: Without dead ends: 452 [2021-11-25 19:47:24,601 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 781 GetRequests, 478 SyntacticMatches, 30 SemanticMatches, 273 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13954 ImplicationChecksByTransitivity, 17.5s TimeCoverageRelationStatistics Valid=26096, Invalid=49254, Unknown=0, NotChecked=0, Total=75350 [2021-11-25 19:47:24,602 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 1234 mSDsluCounter, 146 mSDsCounter, 0 mSdLazyCounter, 581 mSolverCounterSat, 799 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1234 SdHoareTripleChecker+Valid, 147 SdHoareTripleChecker+Invalid, 1380 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 799 IncrementalHoareTripleChecker+Valid, 581 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2021-11-25 19:47:24,602 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1234 Valid, 147 Invalid, 1380 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [799 Valid, 581 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2021-11-25 19:47:24,603 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 452 states. [2021-11-25 19:47:24,786 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 452 to 452. [2021-11-25 19:47:24,787 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 452 states, 451 states have (on average 1.0044345898004434) internal successors, (453), 451 states have internal predecessors, (453), 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 19:47:24,791 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 452 states to 452 states and 453 transitions. [2021-11-25 19:47:24,792 INFO L78 Accepts]: Start accepts. Automaton has 452 states and 453 transitions. Word has length 181 [2021-11-25 19:47:24,792 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:47:24,792 INFO L470 AbstractCegarLoop]: Abstraction has 452 states and 453 transitions. [2021-11-25 19:47:24,793 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 152 states, 152 states have (on average 1.638157894736842) internal successors, (249), 152 states have internal predecessors, (249), 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 19:47:24,793 INFO L276 IsEmpty]: Start isEmpty. Operand 452 states and 453 transitions. [2021-11-25 19:47:24,802 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 452 [2021-11-25 19:47:24,803 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:47:24,803 INFO L514 BasicCegarLoop]: trace histogram [149, 148, 148, 1, 1, 1, 1, 1, 1] [2021-11-25 19:47:24,891 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd6fd660-d188-4f34-93aa-eb193ed99d40/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2021-11-25 19:47:25,028 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd6fd660-d188-4f34-93aa-eb193ed99d40/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:47:25,029 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:47:25,029 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:47:25,029 INFO L85 PathProgramCache]: Analyzing trace with hash -1051002591, now seen corresponding path program 9 times [2021-11-25 19:47:25,030 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:47:25,030 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1573013750] [2021-11-25 19:47:25,030 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:47:25,030 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:47:25,460 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:47:33,411 INFO L134 CoverageAnalysis]: Checked inductivity of 33078 backedges. 0 proven. 11026 refuted. 0 times theorem prover too weak. 22052 trivial. 0 not checked. [2021-11-25 19:47:33,411 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:47:33,412 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1573013750] [2021-11-25 19:47:33,412 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1573013750] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:47:33,412 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [505714223] [2021-11-25 19:47:33,412 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 19:47:33,413 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:47:33,413 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd6fd660-d188-4f34-93aa-eb193ed99d40/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:47:33,421 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd6fd660-d188-4f34-93aa-eb193ed99d40/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:47:33,422 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd6fd660-d188-4f34-93aa-eb193ed99d40/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-11-25 19:47:34,010 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 19:47:34,010 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 19:47:34,028 INFO L263 TraceCheckSpWp]: Trace formula consists of 2120 conjuncts, 150 conjunts are in the unsatisfiable core [2021-11-25 19:47:34,043 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:47:34,901 INFO L134 CoverageAnalysis]: Checked inductivity of 33078 backedges. 0 proven. 11026 refuted. 0 times theorem prover too weak. 22052 trivial. 0 not checked. [2021-11-25 19:47:34,901 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:47:59,539 INFO L134 CoverageAnalysis]: Checked inductivity of 33078 backedges. 0 proven. 11026 refuted. 0 times theorem prover too weak. 22052 trivial. 0 not checked. [2021-11-25 19:47:59,539 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [505714223] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:47:59,539 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1681164722] [2021-11-25 19:47:59,542 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-25 19:47:59,542 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 19:47:59,542 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 19:47:59,543 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 19:47:59,543 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 19:47:59,575 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:47:59,586 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-25 19:47:59,587 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 17 treesize of output 26 [2021-11-25 19:47:59,594 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:47:59,607 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-25 19:47:59,608 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2021-11-25 19:47:59,629 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:47:59,631 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 33 [2021-11-25 19:47:59,682 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:47:59,685 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:47:59,687 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:47:59,699 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-25 19:47:59,700 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 200 treesize of output 188 [2021-11-25 19:47:59,738 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 19:47:59,814 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 19:48:17,421 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '11710#(and (<= 0 |ULTIMATE.start_main_~#A~0#1.base|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (ite (<= |ULTIMATE.start_main_~i~0#1| 512) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start_main_~#A~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 19:48:17,422 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 19:48:17,422 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 19:48:17,422 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [150, 150, 150] total 300 [2021-11-25 19:48:17,423 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [764074355] [2021-11-25 19:48:17,423 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 19:48:17,424 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 301 states [2021-11-25 19:48:17,425 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:48:17,430 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 301 interpolants. [2021-11-25 19:48:17,436 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=45159, Invalid=46953, Unknown=0, NotChecked=0, Total=92112 [2021-11-25 19:48:17,437 INFO L87 Difference]: Start difference. First operand 452 states and 453 transitions. Second operand has 301 states, 301 states have (on average 1.0232558139534884) internal successors, (308), 300 states have internal predecessors, (308), 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 19:49:06,988 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 19:49:06,988 INFO L93 Difference]: Finished difference Result 1804 states and 1955 transitions. [2021-11-25 19:49:06,988 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 300 states. [2021-11-25 19:49:06,989 INFO L78 Accepts]: Start accepts. Automaton has has 301 states, 301 states have (on average 1.0232558139534884) internal successors, (308), 300 states have internal predecessors, (308), 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 451 [2021-11-25 19:49:06,990 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 19:49:06,998 INFO L225 Difference]: With dead ends: 1804 [2021-11-25 19:49:06,999 INFO L226 Difference]: Without dead ends: 1502 [2021-11-25 19:49:07,006 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1501 GetRequests, 1050 SyntacticMatches, 149 SemanticMatches, 302 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 68536 ImplicationChecksByTransitivity, 48.7s TimeCoverageRelationStatistics Valid=45159, Invalid=46953, Unknown=0, NotChecked=0, Total=92112 [2021-11-25 19:49:07,007 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 4576 mSDsluCounter, 468 mSDsCounter, 0 mSdLazyCounter, 1056 mSolverCounterSat, 1791 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4576 SdHoareTripleChecker+Valid, 471 SdHoareTripleChecker+Invalid, 2847 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1791 IncrementalHoareTripleChecker+Valid, 1056 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.8s IncrementalHoareTripleChecker+Time [2021-11-25 19:49:07,007 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [4576 Valid, 471 Invalid, 2847 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1791 Valid, 1056 Invalid, 0 Unknown, 0 Unchecked, 1.8s Time] [2021-11-25 19:49:07,010 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1502 states. [2021-11-25 19:49:07,197 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1502 to 602. [2021-11-25 19:49:07,198 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 602 states, 601 states have (on average 1.0033277870216306) internal successors, (603), 601 states have internal predecessors, (603), 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 19:49:07,201 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 602 states to 602 states and 603 transitions. [2021-11-25 19:49:07,201 INFO L78 Accepts]: Start accepts. Automaton has 602 states and 603 transitions. Word has length 451 [2021-11-25 19:49:07,201 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 19:49:07,202 INFO L470 AbstractCegarLoop]: Abstraction has 602 states and 603 transitions. [2021-11-25 19:49:07,202 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 301 states, 301 states have (on average 1.0232558139534884) internal successors, (308), 300 states have internal predecessors, (308), 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 19:49:07,203 INFO L276 IsEmpty]: Start isEmpty. Operand 602 states and 603 transitions. [2021-11-25 19:49:07,219 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 602 [2021-11-25 19:49:07,219 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 19:49:07,220 INFO L514 BasicCegarLoop]: trace histogram [298, 149, 148, 1, 1, 1, 1, 1, 1] [2021-11-25 19:49:07,262 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd6fd660-d188-4f34-93aa-eb193ed99d40/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2021-11-25 19:49:07,432 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd6fd660-d188-4f34-93aa-eb193ed99d40/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2021-11-25 19:49:07,433 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 19:49:07,433 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 19:49:07,433 INFO L85 PathProgramCache]: Analyzing trace with hash -281697567, now seen corresponding path program 10 times [2021-11-25 19:49:07,433 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 19:49:07,433 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1917140926] [2021-11-25 19:49:07,433 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 19:49:07,433 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 19:49:08,326 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:49:40,072 INFO L134 CoverageAnalysis]: Checked inductivity of 66603 backedges. 0 proven. 44551 refuted. 0 times theorem prover too weak. 22052 trivial. 0 not checked. [2021-11-25 19:49:40,073 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 19:49:40,073 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1917140926] [2021-11-25 19:49:40,073 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1917140926] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-25 19:49:40,073 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1077638325] [2021-11-25 19:49:40,074 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 19:49:40,074 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 19:49:40,074 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd6fd660-d188-4f34-93aa-eb193ed99d40/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 19:49:40,093 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd6fd660-d188-4f34-93aa-eb193ed99d40/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 19:49:40,097 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_dd6fd660-d188-4f34-93aa-eb193ed99d40/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2021-11-25 19:49:40,984 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 19:49:41,012 INFO L263 TraceCheckSpWp]: Trace formula consists of 3470 conjuncts, 300 conjunts are in the unsatisfiable core [2021-11-25 19:49:41,028 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 19:49:42,267 INFO L134 CoverageAnalysis]: Checked inductivity of 66603 backedges. 0 proven. 44551 refuted. 0 times theorem prover too weak. 22052 trivial. 0 not checked. [2021-11-25 19:49:42,268 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 19:51:15,396 INFO L134 CoverageAnalysis]: Checked inductivity of 66603 backedges. 0 proven. 44551 refuted. 0 times theorem prover too weak. 22052 trivial. 0 not checked. [2021-11-25 19:51:15,396 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1077638325] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 19:51:15,397 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [335492221] [2021-11-25 19:51:15,399 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-25 19:51:15,399 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 19:51:15,400 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 19:51:15,400 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 19:51:15,400 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 19:51:15,426 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:51:15,439 INFO L354 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2021-11-25 19:51:15,440 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 4 select indices, 4 select index equivalence classes, 5 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 2 case distinctions, treesize of input 27 treesize of output 37 [2021-11-25 19:51:15,448 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:51:15,449 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 22 [2021-11-25 19:51:15,469 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:51:15,470 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2021-11-25 19:51:15,510 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 19:51:15,511 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 19:51:15,536 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-25 19:51:15,537 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 190 treesize of output 189 [2021-11-25 19:51:15,600 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 19:51:15,675 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 19:51:47,854 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '19515#(and (<= 0 |ULTIMATE.start_main_~#A~0#1.base|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (ite (<= |ULTIMATE.start_main_~i~0#1| 512) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start_main_~#A~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-25 19:51:47,854 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 19:51:47,855 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-25 19:51:47,855 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [300, 300, 300] total 600 [2021-11-25 19:51:47,855 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [706860627] [2021-11-25 19:51:47,856 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-25 19:51:47,857 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 601 states [2021-11-25 19:51:47,858 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 19:51:47,879 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 601 interpolants. [2021-11-25 19:51:47,892 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=180309, Invalid=183903, Unknown=0, NotChecked=0, Total=364212 [2021-11-25 19:51:47,893 INFO L87 Difference]: Start difference. First operand 602 states and 603 transitions. Second operand has 601 states, 601 states have (on average 1.0116472545757071) internal successors, (608), 600 states have internal predecessors, (608), 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)