./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/array-tiling/rewrev.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version aef121e0 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_56ece289-cfcb-42a3-8cd0-16fb652fd41e/bin/utaipan-EQgc7hIp5V/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_56ece289-cfcb-42a3-8cd0-16fb652fd41e/bin/utaipan-EQgc7hIp5V/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_56ece289-cfcb-42a3-8cd0-16fb652fd41e/bin/utaipan-EQgc7hIp5V/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_56ece289-cfcb-42a3-8cd0-16fb652fd41e/bin/utaipan-EQgc7hIp5V/config/TaipanReach.xml -i ../../sv-benchmarks/c/array-tiling/rewrev.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_56ece289-cfcb-42a3-8cd0-16fb652fd41e/bin/utaipan-EQgc7hIp5V/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_56ece289-cfcb-42a3-8cd0-16fb652fd41e/bin/utaipan-EQgc7hIp5V --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 40cb4a1cdff0a4e27345697e0d771f8cc035da7ed4f2bd40d71a1d68f6e99f3f --- Real Ultimate output --- This is Ultimate 0.2.1-dev-aef121e [2021-11-23 02:04:02,190 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-23 02:04:02,192 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-23 02:04:02,239 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-23 02:04:02,240 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-23 02:04:02,241 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-23 02:04:02,244 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-23 02:04:02,247 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-23 02:04:02,249 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-23 02:04:02,251 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-23 02:04:02,252 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-23 02:04:02,254 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-23 02:04:02,255 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-23 02:04:02,256 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-23 02:04:02,258 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-23 02:04:02,260 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-23 02:04:02,262 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-23 02:04:02,263 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-23 02:04:02,266 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-23 02:04:02,269 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-23 02:04:02,271 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-23 02:04:02,273 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-23 02:04:02,275 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-23 02:04:02,276 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-23 02:04:02,281 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-23 02:04:02,281 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-23 02:04:02,282 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-23 02:04:02,283 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-23 02:04:02,284 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-23 02:04:02,285 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-23 02:04:02,286 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-23 02:04:02,287 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-23 02:04:02,289 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-23 02:04:02,290 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-23 02:04:02,292 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-23 02:04:02,292 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-23 02:04:02,293 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-23 02:04:02,294 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-23 02:04:02,294 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-23 02:04:02,295 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-23 02:04:02,296 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-23 02:04:02,297 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_56ece289-cfcb-42a3-8cd0-16fb652fd41e/bin/utaipan-EQgc7hIp5V/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-23 02:04:02,333 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-23 02:04:02,333 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-23 02:04:02,334 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-23 02:04:02,334 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-23 02:04:02,338 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-23 02:04:02,344 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-23 02:04:02,345 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-23 02:04:02,345 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-23 02:04:02,345 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-23 02:04:02,345 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-23 02:04:02,346 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-23 02:04:02,347 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-23 02:04:02,347 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-23 02:04:02,347 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-23 02:04:02,347 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-23 02:04:02,347 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-23 02:04:02,348 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-23 02:04:02,348 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-23 02:04:02,349 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-23 02:04:02,349 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-23 02:04:02,349 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-23 02:04:02,350 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-23 02:04:02,350 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-23 02:04:02,350 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-23 02:04:02,351 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-23 02:04:02,351 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-23 02:04:02,352 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-23 02:04:02,353 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-23 02:04:02,353 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-23 02:04:02,353 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-23 02:04:02,353 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-23 02:04:02,354 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-23 02:04:02,354 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 02:04:02,354 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-23 02:04:02,354 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-23 02:04:02,354 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-23 02:04:02,355 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-23 02:04:02,355 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-23 02:04:02,355 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-23 02:04:02,355 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-23 02:04:02,355 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-23 02:04:02,356 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_56ece289-cfcb-42a3-8cd0-16fb652fd41e/bin/utaipan-EQgc7hIp5V/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_56ece289-cfcb-42a3-8cd0-16fb652fd41e/bin/utaipan-EQgc7hIp5V Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 40cb4a1cdff0a4e27345697e0d771f8cc035da7ed4f2bd40d71a1d68f6e99f3f [2021-11-23 02:04:02,699 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-23 02:04:02,732 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-23 02:04:02,735 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-23 02:04:02,736 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-23 02:04:02,738 INFO L275 PluginConnector]: CDTParser initialized [2021-11-23 02:04:02,740 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_56ece289-cfcb-42a3-8cd0-16fb652fd41e/bin/utaipan-EQgc7hIp5V/../../sv-benchmarks/c/array-tiling/rewrev.c [2021-11-23 02:04:02,810 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_56ece289-cfcb-42a3-8cd0-16fb652fd41e/bin/utaipan-EQgc7hIp5V/data/c2536a74b/c7258cae6dc94b4dadcfd36889c91cb7/FLAG3b542253f [2021-11-23 02:04:03,318 INFO L306 CDTParser]: Found 1 translation units. [2021-11-23 02:04:03,318 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_56ece289-cfcb-42a3-8cd0-16fb652fd41e/sv-benchmarks/c/array-tiling/rewrev.c [2021-11-23 02:04:03,330 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_56ece289-cfcb-42a3-8cd0-16fb652fd41e/bin/utaipan-EQgc7hIp5V/data/c2536a74b/c7258cae6dc94b4dadcfd36889c91cb7/FLAG3b542253f [2021-11-23 02:04:03,669 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_56ece289-cfcb-42a3-8cd0-16fb652fd41e/bin/utaipan-EQgc7hIp5V/data/c2536a74b/c7258cae6dc94b4dadcfd36889c91cb7 [2021-11-23 02:04:03,672 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-23 02:04:03,674 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-23 02:04:03,676 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-23 02:04:03,676 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-23 02:04:03,680 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-23 02:04:03,681 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 02:04:03" (1/1) ... [2021-11-23 02:04:03,683 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@7ac0c313 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:04:03, skipping insertion in model container [2021-11-23 02:04:03,683 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 02:04:03" (1/1) ... [2021-11-23 02:04:03,698 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-23 02:04:03,717 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-23 02:04:03,940 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_56ece289-cfcb-42a3-8cd0-16fb652fd41e/sv-benchmarks/c/array-tiling/rewrev.c[397,410] [2021-11-23 02:04:03,973 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 02:04:03,985 INFO L203 MainTranslator]: Completed pre-run [2021-11-23 02:04:04,001 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_56ece289-cfcb-42a3-8cd0-16fb652fd41e/sv-benchmarks/c/array-tiling/rewrev.c[397,410] [2021-11-23 02:04:04,007 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 02:04:04,023 INFO L208 MainTranslator]: Completed translation [2021-11-23 02:04:04,023 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:04:04 WrapperNode [2021-11-23 02:04:04,024 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-23 02:04:04,025 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-23 02:04:04,025 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-23 02:04:04,025 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-23 02:04:04,034 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:04:04" (1/1) ... [2021-11-23 02:04:04,042 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:04:04" (1/1) ... [2021-11-23 02:04:04,069 INFO L137 Inliner]: procedures = 16, calls = 12, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 52 [2021-11-23 02:04:04,070 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-23 02:04:04,071 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-23 02:04:04,071 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-23 02:04:04,072 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-23 02:04:04,081 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:04:04" (1/1) ... [2021-11-23 02:04:04,082 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:04:04" (1/1) ... [2021-11-23 02:04:04,096 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:04:04" (1/1) ... [2021-11-23 02:04:04,096 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:04:04" (1/1) ... [2021-11-23 02:04:04,101 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:04:04" (1/1) ... [2021-11-23 02:04:04,105 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:04:04" (1/1) ... [2021-11-23 02:04:04,113 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:04:04" (1/1) ... [2021-11-23 02:04:04,120 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-23 02:04:04,122 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-23 02:04:04,122 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-23 02:04:04,122 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-23 02:04:04,123 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:04:04" (1/1) ... [2021-11-23 02:04:04,131 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 02:04:04,144 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_56ece289-cfcb-42a3-8cd0-16fb652fd41e/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:04:04,165 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_56ece289-cfcb-42a3-8cd0-16fb652fd41e/bin/utaipan-EQgc7hIp5V/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-23 02:04:04,187 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_56ece289-cfcb-42a3-8cd0-16fb652fd41e/bin/utaipan-EQgc7hIp5V/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-23 02:04:04,231 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-23 02:04:04,231 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-23 02:04:04,231 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-11-23 02:04:04,231 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2021-11-23 02:04:04,231 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-23 02:04:04,232 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-23 02:04:04,232 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-11-23 02:04:04,315 INFO L236 CfgBuilder]: Building ICFG [2021-11-23 02:04:04,318 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-23 02:04:04,519 INFO L277 CfgBuilder]: Performing block encoding [2021-11-23 02:04:04,549 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-23 02:04:04,550 INFO L301 CfgBuilder]: Removed 2 assume(true) statements. [2021-11-23 02:04:04,552 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 02:04:04 BoogieIcfgContainer [2021-11-23 02:04:04,553 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-23 02:04:04,555 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-23 02:04:04,555 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-23 02:04:04,560 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-23 02:04:04,560 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.11 02:04:03" (1/3) ... [2021-11-23 02:04:04,561 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@73c421c4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 02:04:04, skipping insertion in model container [2021-11-23 02:04:04,561 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:04:04" (2/3) ... [2021-11-23 02:04:04,562 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@73c421c4 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 02:04:04, skipping insertion in model container [2021-11-23 02:04:04,562 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 02:04:04" (3/3) ... [2021-11-23 02:04:04,564 INFO L111 eAbstractionObserver]: Analyzing ICFG rewrev.c [2021-11-23 02:04:04,570 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-23 02:04:04,570 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-23 02:04:04,628 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-23 02:04:04,637 INFO L339 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mLoopAccelerationTechnique=FAST_UPR [2021-11-23 02:04:04,638 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-23 02:04:04,680 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) [2021-11-23 02:04:04,686 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2021-11-23 02:04:04,686 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:04:04,687 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2021-11-23 02:04:04,688 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:04:04,694 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:04:04,694 INFO L85 PathProgramCache]: Analyzing trace with hash -1711726035, now seen corresponding path program 1 times [2021-11-23 02:04:04,719 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:04:04,720 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1978782290] [2021-11-23 02:04:04,720 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:04:04,721 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:04:04,823 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:04:04,889 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:04:04,890 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:04:04,890 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1978782290] [2021-11-23 02:04:04,891 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1978782290] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:04:04,892 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:04:04,892 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 02:04:04,894 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2130297913] [2021-11-23 02:04:04,895 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:04:04,899 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 02:04:04,900 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:04:04,931 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 02:04:04,932 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 02:04:04,934 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 3 states, 3 states have (on average 2.0) internal successors, (6), 3 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) [2021-11-23 02:04:04,972 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:04:04,973 INFO L93 Difference]: Finished difference Result 20 states and 24 transitions. [2021-11-23 02:04:04,974 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 02:04:04,976 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.0) internal successors, (6), 3 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 [2021-11-23 02:04:04,976 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:04:04,985 INFO L225 Difference]: With dead ends: 20 [2021-11-23 02:04:04,986 INFO L226 Difference]: Without dead ends: 9 [2021-11-23 02:04:04,989 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 02:04:04,994 INFO L933 BasicCegarLoop]: 5 mSDtfsCounter, 6 mSDsluCounter, 2 mSDsCounter, 0 mSdLazyCounter, 11 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 6 SdHoareTripleChecker+Invalid, 13 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 11 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 02:04:04,996 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [6 Valid, 6 Invalid, 13 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 11 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 02:04:05,019 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9 states. [2021-11-23 02:04:05,033 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9 to 9. [2021-11-23 02:04:05,034 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) [2021-11-23 02:04:05,035 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9 states to 9 states and 10 transitions. [2021-11-23 02:04:05,037 INFO L78 Accepts]: Start accepts. Automaton has 9 states and 10 transitions. Word has length 6 [2021-11-23 02:04:05,037 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:04:05,038 INFO L470 AbstractCegarLoop]: Abstraction has 9 states and 10 transitions. [2021-11-23 02:04:05,038 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 2.0) internal successors, (6), 3 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) [2021-11-23 02:04:05,039 INFO L276 IsEmpty]: Start isEmpty. Operand 9 states and 10 transitions. [2021-11-23 02:04:05,039 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2021-11-23 02:04:05,040 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:04:05,040 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:04:05,040 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-23 02:04:05,041 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:04:05,042 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:04:05,042 INFO L85 PathProgramCache]: Analyzing trace with hash -1524796169, now seen corresponding path program 1 times [2021-11-23 02:04:05,043 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:04:05,043 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1710138395] [2021-11-23 02:04:05,044 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:04:05,044 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:04:05,101 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:04:05,137 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:04:05,138 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:04:05,138 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1710138395] [2021-11-23 02:04:05,139 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1710138395] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:04:05,139 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2040213937] [2021-11-23 02:04:05,140 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:04:05,140 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:04:05,141 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_56ece289-cfcb-42a3-8cd0-16fb652fd41e/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:04:05,143 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_56ece289-cfcb-42a3-8cd0-16fb652fd41e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:04:05,214 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_56ece289-cfcb-42a3-8cd0-16fb652fd41e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-23 02:04:05,280 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:04:05,282 INFO L263 TraceCheckSpWp]: Trace formula consists of 65 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 02:04:05,290 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:04:05,390 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:04:05,391 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:04:05,431 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:04:05,432 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2040213937] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:04:05,432 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [30055523] [2021-11-23 02:04:05,458 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-23 02:04:05,458 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:04:05,464 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:04:05,471 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:04:05,472 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:04:05,732 INFO L354 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2021-11-23 02:04:05,734 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2021-11-23 02:04:05,770 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 32 [2021-11-23 02:04:05,971 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:05,974 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 2 select indices, 2 select index equivalence classes, 7 disjoint index pairs (out of 1 index pairs), introduced 4 new quantified variables, introduced 0 case distinctions, treesize of input 69 treesize of output 91 [2021-11-23 02:04:06,109 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 14 [2021-11-23 02:04:06,194 WARN L234 Elim1Store]: Array PQE input equivalent to false [2021-11-23 02:04:06,532 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:06,539 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:06,541 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:06,543 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:06,549 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:06,553 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:06,557 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:06,559 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:06,629 INFO L354 Elim1Store]: treesize reduction 130, result has 10.3 percent of original size [2021-11-23 02:04:06,642 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 4 select indices, 4 select index equivalence classes, 9 disjoint index pairs (out of 6 index pairs), introduced 6 new quantified variables, introduced 7 case distinctions, treesize of input 312 treesize of output 332 [2021-11-23 02:04:06,811 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:06,813 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:06,814 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:06,817 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:06,824 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 5 select indices, 5 select index equivalence classes, 5 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 0 case distinctions, treesize of input 68 treesize of output 33 [2021-11-23 02:04:06,966 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:06,969 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:06,970 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:06,972 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:06,973 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:06,981 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-23 02:04:06,982 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 6 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 4 case distinctions, treesize of input 301 treesize of output 250 [2021-11-23 02:04:07,259 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 [2021-11-23 02:04:07,269 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:07,270 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 35 treesize of output 34 [2021-11-23 02:04:07,311 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:04:07,564 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '95#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (= |ULTIMATE.start_main_~i~0#1| 0) (= ~MAX~0 100000) (= (ite (<= |ULTIMATE.start_main_~low~0#1| |ULTIMATE.start_main_#t~mem8#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= |ULTIMATE.start_main_~low~0#1| 2) (<= ~SIZE~0 100000) (= 3 |ULTIMATE.start_main_~val2~0#1|) (= 7 |ULTIMATE.start_main_~val1~0#1|) (= (select (select |#memory_int| |ULTIMATE.start_main_~a~0#1.base|) (+ |ULTIMATE.start_main_~a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem8#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-23 02:04:07,565 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:04:07,565 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:04:07,565 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 4 [2021-11-23 02:04:07,566 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [462632942] [2021-11-23 02:04:07,566 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:04:07,567 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 02:04:07,567 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:04:07,567 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 02:04:07,568 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=44, Unknown=0, NotChecked=0, Total=72 [2021-11-23 02:04:07,568 INFO L87 Difference]: Start difference. First operand 9 states and 10 transitions. Second operand has 4 states, 4 states have (on average 1.75) internal successors, (7), 4 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) [2021-11-23 02:04:07,588 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:04:07,588 INFO L93 Difference]: Finished difference Result 15 states and 17 transitions. [2021-11-23 02:04:07,589 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 02:04:07,589 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 1.75) internal successors, (7), 4 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 [2021-11-23 02:04:07,589 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:04:07,590 INFO L225 Difference]: With dead ends: 15 [2021-11-23 02:04:07,590 INFO L226 Difference]: Without dead ends: 10 [2021-11-23 02:04:07,591 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 15 SyntacticMatches, 1 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=28, Invalid=44, Unknown=0, NotChecked=0, Total=72 [2021-11-23 02:04:07,592 INFO L933 BasicCegarLoop]: 4 mSDtfsCounter, 4 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 9 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4 SdHoareTripleChecker+Valid, 4 SdHoareTripleChecker+Invalid, 12 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 9 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 02:04:07,593 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [4 Valid, 4 Invalid, 12 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 9 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 02:04:07,594 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 10 states. [2021-11-23 02:04:07,596 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 10 to 10. [2021-11-23 02:04:07,597 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 10 states, 9 states have (on average 1.2222222222222223) internal successors, (11), 9 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:04:07,597 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 10 states to 10 states and 11 transitions. [2021-11-23 02:04:07,598 INFO L78 Accepts]: Start accepts. Automaton has 10 states and 11 transitions. Word has length 7 [2021-11-23 02:04:07,598 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:04:07,598 INFO L470 AbstractCegarLoop]: Abstraction has 10 states and 11 transitions. [2021-11-23 02:04:07,598 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 1.75) internal successors, (7), 4 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) [2021-11-23 02:04:07,599 INFO L276 IsEmpty]: Start isEmpty. Operand 10 states and 11 transitions. [2021-11-23 02:04:07,599 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2021-11-23 02:04:07,599 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:04:07,599 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1] [2021-11-23 02:04:07,636 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_56ece289-cfcb-42a3-8cd0-16fb652fd41e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-23 02:04:07,822 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_56ece289-cfcb-42a3-8cd0-16fb652fd41e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:04:07,823 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:04:07,823 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:04:07,824 INFO L85 PathProgramCache]: Analyzing trace with hash -24937619, now seen corresponding path program 2 times [2021-11-23 02:04:07,824 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:04:07,824 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1609500722] [2021-11-23 02:04:07,824 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:04:07,824 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:04:07,872 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:04:08,028 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:04:08,029 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:04:08,029 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1609500722] [2021-11-23 02:04:08,031 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1609500722] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:04:08,031 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1361363093] [2021-11-23 02:04:08,032 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 02:04:08,034 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:04:08,034 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_56ece289-cfcb-42a3-8cd0-16fb652fd41e/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:04:08,035 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_56ece289-cfcb-42a3-8cd0-16fb652fd41e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:04:08,059 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_56ece289-cfcb-42a3-8cd0-16fb652fd41e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-23 02:04:08,090 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-11-23 02:04:08,090 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:04:08,091 INFO L263 TraceCheckSpWp]: Trace formula consists of 70 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-23 02:04:08,093 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:04:08,133 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 30 treesize of output 26 [2021-11-23 02:04:08,251 INFO L354 Elim1Store]: treesize reduction 10, result has 23.1 percent of original size [2021-11-23 02:04:08,251 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 49 treesize of output 39 [2021-11-23 02:04:08,294 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 02:04:08,294 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:04:08,406 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 13 [2021-11-23 02:04:08,421 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 28 treesize of output 26 [2021-11-23 02:04:08,479 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:04:08,481 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1361363093] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:04:08,485 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [27267125] [2021-11-23 02:04:08,494 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-23 02:04:08,494 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:04:08,495 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:04:08,495 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:04:08,495 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:04:08,568 INFO L354 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2021-11-23 02:04:08,571 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2021-11-23 02:04:08,586 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 32 [2021-11-23 02:04:08,651 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:08,654 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 2 select indices, 2 select index equivalence classes, 7 disjoint index pairs (out of 1 index pairs), introduced 4 new quantified variables, introduced 0 case distinctions, treesize of input 65 treesize of output 87 [2021-11-23 02:04:08,703 WARN L234 Elim1Store]: Array PQE input equivalent to false [2021-11-23 02:04:08,718 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 49 treesize of output 24 [2021-11-23 02:04:08,842 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:08,846 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:08,851 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:08,855 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:08,859 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:08,861 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:08,862 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:08,988 INFO L354 Elim1Store]: treesize reduction 399, result has 16.9 percent of original size [2021-11-23 02:04:08,989 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 4 select indices, 4 select index equivalence classes, 8 disjoint index pairs (out of 6 index pairs), introduced 6 new quantified variables, introduced 11 case distinctions, treesize of input 312 treesize of output 374 [2021-11-23 02:04:09,365 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:09,369 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:09,371 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:09,373 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:09,374 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:09,400 INFO L354 Elim1Store]: treesize reduction 53, result has 25.4 percent of original size [2021-11-23 02:04:09,402 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 5 select indices, 5 select index equivalence classes, 6 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 8 case distinctions, treesize of input 835 treesize of output 808 [2021-11-23 02:04:10,388 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:10,395 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:10,396 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 02:04:10,399 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:10,401 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:10,409 INFO L354 Elim1Store]: treesize reduction 43, result has 2.3 percent of original size [2021-11-23 02:04:10,410 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 5 select indices, 5 select index equivalence classes, 5 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 7 case distinctions, treesize of input 847 treesize of output 746 [2021-11-23 02:04:10,988 WARN L221 IntervalDomain]: Interval conversion did not stabilize in 12 iterations. Over-approximation may be very coarse. [2021-11-23 02:04:10,991 WARN L221 IntervalDomain]: Interval conversion did not stabilize in 12 iterations. Over-approximation may be very coarse. [2021-11-23 02:04:10,996 WARN L221 IntervalDomain]: Interval conversion did not stabilize in 12 iterations. Over-approximation may be very coarse. [2021-11-23 02:04:11,001 WARN L221 IntervalDomain]: Interval conversion did not stabilize in 12 iterations. Over-approximation may be very coarse. [2021-11-23 02:04:11,005 WARN L221 IntervalDomain]: Interval conversion did not stabilize in 12 iterations. Over-approximation may be very coarse. [2021-11-23 02:04:11,030 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 [2021-11-23 02:04:11,037 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:11,038 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 42 treesize of output 41 [2021-11-23 02:04:11,064 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:04:11,344 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '191#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (= |ULTIMATE.start_main_~i~0#1| 0) (= ~MAX~0 100000) (= (ite (<= |ULTIMATE.start_main_~low~0#1| |ULTIMATE.start_main_#t~mem8#1|) 1 0) |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= |ULTIMATE.start_main_~low~0#1| 2) (<= ~SIZE~0 100000) (= 3 |ULTIMATE.start_main_~val2~0#1|) (= 7 |ULTIMATE.start_main_~val1~0#1|) (= (select (select |#memory_int| |ULTIMATE.start_main_~a~0#1.base|) (+ |ULTIMATE.start_main_~a~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| 4))) |ULTIMATE.start_main_#t~mem8#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (< |ULTIMATE.start_main_~i~0#1| ~SIZE~0) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-23 02:04:11,345 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:04:11,345 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:04:11,345 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6, 7] total 15 [2021-11-23 02:04:11,345 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1892406785] [2021-11-23 02:04:11,345 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:04:11,346 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2021-11-23 02:04:11,346 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:04:11,347 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-11-23 02:04:11,348 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=91, Invalid=289, Unknown=0, NotChecked=0, Total=380 [2021-11-23 02:04:11,348 INFO L87 Difference]: Start difference. First operand 10 states and 11 transitions. Second operand has 15 states, 15 states have (on average 1.2666666666666666) internal successors, (19), 15 states have internal predecessors, (19), 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) [2021-11-23 02:04:11,506 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:04:11,506 INFO L93 Difference]: Finished difference Result 20 states and 21 transitions. [2021-11-23 02:04:11,506 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-11-23 02:04:11,507 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.2666666666666666) internal successors, (19), 15 states have internal predecessors, (19), 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 [2021-11-23 02:04:11,507 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:04:11,507 INFO L225 Difference]: With dead ends: 20 [2021-11-23 02:04:11,507 INFO L226 Difference]: Without dead ends: 18 [2021-11-23 02:04:11,508 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 10 SyntacticMatches, 1 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 147 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=127, Invalid=425, Unknown=0, NotChecked=0, Total=552 [2021-11-23 02:04:11,509 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 9 mSDsluCounter, 26 mSDsCounter, 0 mSdLazyCounter, 29 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 9 SdHoareTripleChecker+Valid, 27 SdHoareTripleChecker+Invalid, 43 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 29 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 7 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 02:04:11,510 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [9 Valid, 27 Invalid, 43 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 29 Invalid, 0 Unknown, 7 Unchecked, 0.0s Time] [2021-11-23 02:04:11,511 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2021-11-23 02:04:11,513 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 12. [2021-11-23 02:04:11,513 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 12 states, 11 states have (on average 1.1818181818181819) internal successors, (13), 11 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) [2021-11-23 02:04:11,514 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 13 transitions. [2021-11-23 02:04:11,514 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 13 transitions. Word has length 8 [2021-11-23 02:04:11,514 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:04:11,514 INFO L470 AbstractCegarLoop]: Abstraction has 12 states and 13 transitions. [2021-11-23 02:04:11,515 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 15 states have (on average 1.2666666666666666) internal successors, (19), 15 states have internal predecessors, (19), 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) [2021-11-23 02:04:11,515 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 13 transitions. [2021-11-23 02:04:11,515 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-11-23 02:04:11,515 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:04:11,515 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:04:11,555 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_56ece289-cfcb-42a3-8cd0-16fb652fd41e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-23 02:04:11,715 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_56ece289-cfcb-42a3-8cd0-16fb652fd41e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:04:11,716 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:04:11,716 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:04:11,717 INFO L85 PathProgramCache]: Analyzing trace with hash 117952073, now seen corresponding path program 1 times [2021-11-23 02:04:11,717 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:04:11,717 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1283425501] [2021-11-23 02:04:11,717 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:04:11,717 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:04:11,752 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:04:11,892 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:04:11,892 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:04:11,893 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1283425501] [2021-11-23 02:04:11,893 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1283425501] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:04:11,893 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1291186151] [2021-11-23 02:04:11,893 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:04:11,893 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:04:11,894 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_56ece289-cfcb-42a3-8cd0-16fb652fd41e/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:04:11,895 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_56ece289-cfcb-42a3-8cd0-16fb652fd41e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:04:11,923 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_56ece289-cfcb-42a3-8cd0-16fb652fd41e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-23 02:04:11,949 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:04:11,950 INFO L263 TraceCheckSpWp]: Trace formula consists of 80 conjuncts, 18 conjunts are in the unsatisfiable core [2021-11-23 02:04:11,952 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:04:11,982 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 [2021-11-23 02:04:12,110 INFO L354 Elim1Store]: treesize reduction 171, result has 17.4 percent of original size [2021-11-23 02:04:12,111 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 79 treesize of output 78 [2021-11-23 02:04:12,131 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:12,132 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 43 treesize of output 25 [2021-11-23 02:04:12,178 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:12,179 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 76 treesize of output 31 [2021-11-23 02:04:12,454 INFO L354 Elim1Store]: treesize reduction 46, result has 6.1 percent of original size [2021-11-23 02:04:12,454 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 72 treesize of output 42 [2021-11-23 02:04:12,503 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:04:12,504 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:04:12,677 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 29 [2021-11-23 02:04:12,681 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 92 treesize of output 88 [2021-11-23 02:04:12,728 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:04:12,728 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1291186151] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:04:12,729 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2079520407] [2021-11-23 02:04:12,735 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-23 02:04:12,735 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:04:12,736 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:04:12,736 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:04:12,736 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:04:12,804 INFO L354 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2021-11-23 02:04:12,805 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2021-11-23 02:04:12,817 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 32 [2021-11-23 02:04:12,890 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:12,892 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 2 select indices, 2 select index equivalence classes, 7 disjoint index pairs (out of 1 index pairs), introduced 4 new quantified variables, introduced 0 case distinctions, treesize of input 69 treesize of output 91 [2021-11-23 02:04:12,932 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 42 treesize of output 21 [2021-11-23 02:04:12,965 WARN L234 Elim1Store]: Array PQE input equivalent to false [2021-11-23 02:04:13,077 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:13,082 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:13,083 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:13,085 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:13,088 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:13,090 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:13,092 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:13,093 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:13,127 INFO L354 Elim1Store]: treesize reduction 130, result has 10.3 percent of original size [2021-11-23 02:04:13,132 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 4 select indices, 4 select index equivalence classes, 9 disjoint index pairs (out of 6 index pairs), introduced 6 new quantified variables, introduced 7 case distinctions, treesize of input 312 treesize of output 332 [2021-11-23 02:04:13,246 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:13,247 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:13,248 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:13,250 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 02:04:13,251 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:13,252 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:13,259 INFO L354 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2021-11-23 02:04:13,260 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 5 select indices, 5 select index equivalence classes, 6 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 313 treesize of output 269 [2021-11-23 02:04:13,374 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:13,375 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:13,377 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:13,378 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:13,380 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:13,385 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-23 02:04:13,386 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 6 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 4 case distinctions, treesize of input 301 treesize of output 259 [2021-11-23 02:04:13,576 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 [2021-11-23 02:04:13,582 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:13,583 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 35 treesize of output 34 [2021-11-23 02:04:13,780 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:04:14,432 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '326#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (= ~MAX~0 100000) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= |ULTIMATE.start_main_~low~0#1| 2) (<= ~SIZE~0 100000) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= 3 |ULTIMATE.start_main_~val2~0#1|) (= 7 |ULTIMATE.start_main_~val1~0#1|) (<= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 1) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-23 02:04:14,433 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:04:14,433 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:04:14,433 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 19 [2021-11-23 02:04:14,433 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [91970619] [2021-11-23 02:04:14,433 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:04:14,434 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2021-11-23 02:04:14,434 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:04:14,435 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-11-23 02:04:14,435 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=106, Invalid=494, Unknown=0, NotChecked=0, Total=600 [2021-11-23 02:04:14,435 INFO L87 Difference]: Start difference. First operand 12 states and 13 transitions. Second operand has 19 states, 19 states have (on average 1.4736842105263157) internal successors, (28), 19 states have internal predecessors, (28), 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) [2021-11-23 02:04:14,696 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:04:14,697 INFO L93 Difference]: Finished difference Result 17 states and 18 transitions. [2021-11-23 02:04:14,697 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-23 02:04:14,697 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 1.4736842105263157) internal successors, (28), 19 states have internal predecessors, (28), 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 11 [2021-11-23 02:04:14,698 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:04:14,698 INFO L225 Difference]: With dead ends: 17 [2021-11-23 02:04:14,698 INFO L226 Difference]: Without dead ends: 15 [2021-11-23 02:04:14,699 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 45 GetRequests, 15 SyntacticMatches, 1 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 185 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=174, Invalid=756, Unknown=0, NotChecked=0, Total=930 [2021-11-23 02:04:14,700 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 0 mSDsluCounter, 15 mSDsCounter, 0 mSdLazyCounter, 20 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 17 SdHoareTripleChecker+Invalid, 36 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 20 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 9 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 02:04:14,701 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 17 Invalid, 36 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 20 Invalid, 0 Unknown, 9 Unchecked, 0.0s Time] [2021-11-23 02:04:14,701 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2021-11-23 02:04:14,705 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2021-11-23 02:04:14,706 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 15 states, 14 states have (on average 1.1428571428571428) internal successors, (16), 14 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:04:14,710 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 16 transitions. [2021-11-23 02:04:14,712 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 16 transitions. Word has length 11 [2021-11-23 02:04:14,712 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:04:14,712 INFO L470 AbstractCegarLoop]: Abstraction has 15 states and 16 transitions. [2021-11-23 02:04:14,713 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 19 states have (on average 1.4736842105263157) internal successors, (28), 19 states have internal predecessors, (28), 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) [2021-11-23 02:04:14,713 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 16 transitions. [2021-11-23 02:04:14,713 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2021-11-23 02:04:14,714 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:04:14,714 INFO L514 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 1, 1, 1, 1, 1] [2021-11-23 02:04:14,736 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_56ece289-cfcb-42a3-8cd0-16fb652fd41e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-23 02:04:14,918 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_56ece289-cfcb-42a3-8cd0-16fb652fd41e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:04:14,919 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:04:14,919 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:04:14,919 INFO L85 PathProgramCache]: Analyzing trace with hash 632176109, now seen corresponding path program 2 times [2021-11-23 02:04:14,919 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:04:14,919 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [150868350] [2021-11-23 02:04:14,920 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:04:14,920 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:04:14,931 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:04:14,989 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 3 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:04:14,990 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:04:14,990 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [150868350] [2021-11-23 02:04:14,990 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [150868350] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:04:14,990 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1434494798] [2021-11-23 02:04:14,991 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 02:04:14,991 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:04:14,991 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_56ece289-cfcb-42a3-8cd0-16fb652fd41e/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:04:14,992 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_56ece289-cfcb-42a3-8cd0-16fb652fd41e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:04:15,024 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_56ece289-cfcb-42a3-8cd0-16fb652fd41e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-23 02:04:15,057 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-11-23 02:04:15,057 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:04:15,058 INFO L263 TraceCheckSpWp]: Trace formula consists of 90 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-23 02:04:15,060 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:04:15,145 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 7 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:04:15,145 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:04:15,222 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 7 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:04:15,222 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1434494798] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:04:15,222 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1865473338] [2021-11-23 02:04:15,225 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-23 02:04:15,225 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:04:15,226 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:04:15,226 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:04:15,226 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:04:15,297 INFO L354 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2021-11-23 02:04:15,298 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2021-11-23 02:04:15,318 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 32 [2021-11-23 02:04:15,371 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:15,374 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 2 select indices, 2 select index equivalence classes, 7 disjoint index pairs (out of 1 index pairs), introduced 4 new quantified variables, introduced 0 case distinctions, treesize of input 69 treesize of output 91 [2021-11-23 02:04:15,407 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 14 [2021-11-23 02:04:15,430 WARN L234 Elim1Store]: Array PQE input equivalent to false [2021-11-23 02:04:15,566 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:15,568 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:15,570 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:15,572 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:15,573 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:15,574 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:15,576 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:15,577 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:15,611 INFO L354 Elim1Store]: treesize reduction 130, result has 10.3 percent of original size [2021-11-23 02:04:15,612 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 4 select indices, 4 select index equivalence classes, 9 disjoint index pairs (out of 6 index pairs), introduced 6 new quantified variables, introduced 7 case distinctions, treesize of input 312 treesize of output 332 [2021-11-23 02:04:15,693 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:15,694 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:15,695 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 3 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 0 case distinctions, treesize of input 56 treesize of output 30 [2021-11-23 02:04:15,723 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:15,724 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:15,725 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:15,727 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 02:04:15,728 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:15,729 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:15,735 INFO L354 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2021-11-23 02:04:15,736 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 5 select indices, 5 select index equivalence classes, 6 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 313 treesize of output 253 [2021-11-23 02:04:15,958 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 [2021-11-23 02:04:15,964 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:15,964 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 42 treesize of output 41 [2021-11-23 02:04:16,190 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:04:16,631 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '480#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (= ~MAX~0 100000) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= |ULTIMATE.start_main_~low~0#1| 2) (<= ~SIZE~0 100000) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= 3 |ULTIMATE.start_main_~val2~0#1|) (= 7 |ULTIMATE.start_main_~val1~0#1|) (<= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 1) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-23 02:04:16,631 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:04:16,631 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:04:16,632 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 14 [2021-11-23 02:04:16,632 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1826154055] [2021-11-23 02:04:16,632 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:04:16,633 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2021-11-23 02:04:16,633 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:04:16,633 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-11-23 02:04:16,634 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=104, Invalid=276, Unknown=0, NotChecked=0, Total=380 [2021-11-23 02:04:16,634 INFO L87 Difference]: Start difference. First operand 15 states and 16 transitions. Second operand has 14 states, 14 states have (on average 2.0714285714285716) internal successors, (29), 14 states have internal predecessors, (29), 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) [2021-11-23 02:04:16,697 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:04:16,697 INFO L93 Difference]: Finished difference Result 28 states and 30 transitions. [2021-11-23 02:04:16,699 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-11-23 02:04:16,699 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 2.0714285714285716) internal successors, (29), 14 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 14 [2021-11-23 02:04:16,699 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:04:16,700 INFO L225 Difference]: With dead ends: 28 [2021-11-23 02:04:16,700 INFO L226 Difference]: Without dead ends: 16 [2021-11-23 02:04:16,701 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 30 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 146 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=104, Invalid=276, Unknown=0, NotChecked=0, Total=380 [2021-11-23 02:04:16,702 INFO L933 BasicCegarLoop]: 5 mSDtfsCounter, 16 mSDsluCounter, 19 mSDsCounter, 0 mSdLazyCounter, 47 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 16 SdHoareTripleChecker+Valid, 24 SdHoareTripleChecker+Invalid, 57 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 47 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:04:16,702 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [16 Valid, 24 Invalid, 57 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 47 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 02:04:16,703 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2021-11-23 02:04:16,707 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2021-11-23 02:04:16,708 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 16 states, 15 states have (on average 1.1333333333333333) internal successors, (17), 15 states have internal predecessors, (17), 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) [2021-11-23 02:04:16,708 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 17 transitions. [2021-11-23 02:04:16,709 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 17 transitions. Word has length 14 [2021-11-23 02:04:16,709 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:04:16,709 INFO L470 AbstractCegarLoop]: Abstraction has 16 states and 17 transitions. [2021-11-23 02:04:16,709 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 2.0714285714285716) internal successors, (29), 14 states have internal predecessors, (29), 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) [2021-11-23 02:04:16,710 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 17 transitions. [2021-11-23 02:04:16,710 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-11-23 02:04:16,710 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:04:16,711 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 1, 1, 1, 1, 1] [2021-11-23 02:04:16,747 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_56ece289-cfcb-42a3-8cd0-16fb652fd41e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-23 02:04:16,926 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_56ece289-cfcb-42a3-8cd0-16fb652fd41e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:04:16,927 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:04:16,927 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:04:16,927 INFO L85 PathProgramCache]: Analyzing trace with hash -1235212617, now seen corresponding path program 3 times [2021-11-23 02:04:16,927 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:04:16,927 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [739203792] [2021-11-23 02:04:16,927 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:04:16,928 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:04:16,963 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:04:17,152 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 13 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:04:17,152 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:04:17,152 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [739203792] [2021-11-23 02:04:17,152 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [739203792] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:04:17,152 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [158646543] [2021-11-23 02:04:17,153 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-23 02:04:17,153 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:04:17,153 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_56ece289-cfcb-42a3-8cd0-16fb652fd41e/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:04:17,153 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_56ece289-cfcb-42a3-8cd0-16fb652fd41e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:04:17,158 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_56ece289-cfcb-42a3-8cd0-16fb652fd41e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-23 02:04:17,195 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-23 02:04:17,196 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:04:17,197 INFO L263 TraceCheckSpWp]: Trace formula consists of 68 conjuncts, 26 conjunts are in the unsatisfiable core [2021-11-23 02:04:17,200 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:04:17,243 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 [2021-11-23 02:04:17,354 INFO L354 Elim1Store]: treesize reduction 176, result has 17.4 percent of original size [2021-11-23 02:04:17,355 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 66 treesize of output 83 [2021-11-23 02:04:17,397 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:17,398 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 7 [2021-11-23 02:04:17,434 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:17,435 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:17,436 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:17,438 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 3 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 37 treesize of output 10 [2021-11-23 02:04:17,590 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:17,592 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:17,594 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:17,595 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:17,596 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:17,598 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:17,601 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-23 02:04:17,601 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 3 select indices, 3 select index equivalence classes, 6 disjoint index pairs (out of 3 index pairs), introduced 5 new quantified variables, introduced 3 case distinctions, treesize of input 109 treesize of output 105 [2021-11-23 02:04:17,628 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:17,629 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:17,630 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:17,631 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 3 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 64 treesize of output 37 [2021-11-23 02:04:17,684 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:17,685 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:17,686 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:17,689 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-23 02:04:17,689 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 3 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 118 treesize of output 46 [2021-11-23 02:04:18,221 INFO L354 Elim1Store]: treesize reduction 82, result has 3.5 percent of original size [2021-11-23 02:04:18,222 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 86 treesize of output 45 [2021-11-23 02:04:18,265 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 3 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:04:18,265 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:04:18,548 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 47 treesize of output 45 [2021-11-23 02:04:18,555 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 838 treesize of output 830 [2021-11-23 02:04:18,724 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 13 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:04:18,724 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [158646543] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:04:18,725 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [274272994] [2021-11-23 02:04:18,728 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-23 02:04:18,728 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:04:18,729 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:04:18,729 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:04:18,729 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:04:18,795 INFO L354 Elim1Store]: treesize reduction 36, result has 43.8 percent of original size [2021-11-23 02:04:18,796 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 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 24 treesize of output 44 [2021-11-23 02:04:18,849 INFO L354 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2021-11-23 02:04:18,850 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2021-11-23 02:04:18,912 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:18,913 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 2 select indices, 2 select index equivalence classes, 7 disjoint index pairs (out of 1 index pairs), introduced 4 new quantified variables, introduced 0 case distinctions, treesize of input 69 treesize of output 91 [2021-11-23 02:04:18,946 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 38 treesize of output 17 [2021-11-23 02:04:18,970 WARN L234 Elim1Store]: Array PQE input equivalent to false [2021-11-23 02:04:19,074 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:19,076 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:19,078 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:19,080 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:19,081 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:19,082 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:19,083 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:19,084 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:19,116 INFO L354 Elim1Store]: treesize reduction 130, result has 10.3 percent of original size [2021-11-23 02:04:19,117 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 4 select indices, 4 select index equivalence classes, 9 disjoint index pairs (out of 6 index pairs), introduced 6 new quantified variables, introduced 7 case distinctions, treesize of input 312 treesize of output 332 [2021-11-23 02:04:19,238 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:19,239 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:19,240 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:19,242 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:19,245 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:19,253 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-23 02:04:19,253 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 6 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 4 case distinctions, treesize of input 301 treesize of output 258 [2021-11-23 02:04:19,364 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:19,365 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:19,366 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:19,367 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 02:04:19,369 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:19,370 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:19,377 INFO L354 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2021-11-23 02:04:19,377 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 5 select indices, 5 select index equivalence classes, 6 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 313 treesize of output 270 [2021-11-23 02:04:19,551 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 [2021-11-23 02:04:19,559 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:19,559 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 42 treesize of output 41 [2021-11-23 02:04:19,749 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:04:20,459 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '657#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (= ~MAX~0 100000) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= |ULTIMATE.start_main_~low~0#1| 2) (<= ~SIZE~0 100000) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= 3 |ULTIMATE.start_main_~val2~0#1|) (= 7 |ULTIMATE.start_main_~val1~0#1|) (<= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 1) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-23 02:04:20,459 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:04:20,459 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:04:20,459 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10] total 25 [2021-11-23 02:04:20,459 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1508482920] [2021-11-23 02:04:20,459 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:04:20,460 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2021-11-23 02:04:20,460 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:04:20,460 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-11-23 02:04:20,461 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=141, Invalid=789, Unknown=0, NotChecked=0, Total=930 [2021-11-23 02:04:20,461 INFO L87 Difference]: Start difference. First operand 16 states and 17 transitions. Second operand has 25 states, 25 states have (on average 1.6) internal successors, (40), 25 states have internal predecessors, (40), 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) [2021-11-23 02:04:21,073 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:04:21,073 INFO L93 Difference]: Finished difference Result 21 states and 22 transitions. [2021-11-23 02:04:21,083 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-23 02:04:21,084 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 1.6) internal successors, (40), 25 states have internal predecessors, (40), 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 15 [2021-11-23 02:04:21,084 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:04:21,085 INFO L225 Difference]: With dead ends: 21 [2021-11-23 02:04:21,085 INFO L226 Difference]: Without dead ends: 19 [2021-11-23 02:04:21,086 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 64 GetRequests, 23 SyntacticMatches, 3 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 336 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=263, Invalid=1297, Unknown=0, NotChecked=0, Total=1560 [2021-11-23 02:04:21,087 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 0 mSDsluCounter, 23 mSDsCounter, 0 mSdLazyCounter, 37 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 25 SdHoareTripleChecker+Invalid, 67 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 37 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 19 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 02:04:21,088 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 25 Invalid, 67 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 37 Invalid, 0 Unknown, 19 Unchecked, 0.0s Time] [2021-11-23 02:04:21,089 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2021-11-23 02:04:21,094 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2021-11-23 02:04:21,094 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19 states, 18 states have (on average 1.1111111111111112) internal successors, (20), 18 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) [2021-11-23 02:04:21,095 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 20 transitions. [2021-11-23 02:04:21,095 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 20 transitions. Word has length 15 [2021-11-23 02:04:21,095 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:04:21,096 INFO L470 AbstractCegarLoop]: Abstraction has 19 states and 20 transitions. [2021-11-23 02:04:21,096 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 25 states have (on average 1.6) internal successors, (40), 25 states have internal predecessors, (40), 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) [2021-11-23 02:04:21,096 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 20 transitions. [2021-11-23 02:04:21,097 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2021-11-23 02:04:21,097 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:04:21,097 INFO L514 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 1, 1, 1, 1, 1] [2021-11-23 02:04:21,141 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_56ece289-cfcb-42a3-8cd0-16fb652fd41e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-23 02:04:21,310 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_56ece289-cfcb-42a3-8cd0-16fb652fd41e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:04:21,311 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:04:21,311 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:04:21,311 INFO L85 PathProgramCache]: Analyzing trace with hash 1065936575, now seen corresponding path program 4 times [2021-11-23 02:04:21,311 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:04:21,311 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [582336779] [2021-11-23 02:04:21,311 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:04:21,312 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:04:21,329 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:04:21,399 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 8 proven. 13 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:04:21,399 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:04:21,399 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [582336779] [2021-11-23 02:04:21,399 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [582336779] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:04:21,399 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [350457920] [2021-11-23 02:04:21,399 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-23 02:04:21,399 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:04:21,400 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_56ece289-cfcb-42a3-8cd0-16fb652fd41e/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:04:21,400 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_56ece289-cfcb-42a3-8cd0-16fb652fd41e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:04:21,401 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_56ece289-cfcb-42a3-8cd0-16fb652fd41e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-23 02:04:21,439 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:04:21,440 INFO L263 TraceCheckSpWp]: Trace formula consists of 105 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-23 02:04:21,441 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:04:21,571 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 15 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:04:21,572 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:04:21,659 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 15 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:04:21,659 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [350457920] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:04:21,659 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1033514286] [2021-11-23 02:04:21,661 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-23 02:04:21,661 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:04:21,662 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:04:21,662 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:04:21,662 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:04:21,722 INFO L354 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2021-11-23 02:04:21,722 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2021-11-23 02:04:21,734 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 32 [2021-11-23 02:04:21,779 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:21,781 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 2 select indices, 2 select index equivalence classes, 7 disjoint index pairs (out of 1 index pairs), introduced 4 new quantified variables, introduced 0 case distinctions, treesize of input 65 treesize of output 87 [2021-11-23 02:04:21,806 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 14 [2021-11-23 02:04:21,825 WARN L234 Elim1Store]: Array PQE input equivalent to false [2021-11-23 02:04:21,923 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:21,929 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:21,931 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:21,935 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:21,939 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:21,940 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:21,942 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:22,059 INFO L354 Elim1Store]: treesize reduction 399, result has 16.9 percent of original size [2021-11-23 02:04:22,060 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 4 select indices, 4 select index equivalence classes, 8 disjoint index pairs (out of 6 index pairs), introduced 6 new quantified variables, introduced 11 case distinctions, treesize of input 312 treesize of output 374 [2021-11-23 02:04:22,275 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:22,278 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:22,280 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:22,281 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:22,282 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:22,305 INFO L354 Elim1Store]: treesize reduction 53, result has 25.4 percent of original size [2021-11-23 02:04:22,306 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 5 select indices, 5 select index equivalence classes, 6 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 8 case distinctions, treesize of input 365 treesize of output 338 [2021-11-23 02:04:22,607 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:22,608 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:22,608 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 02:04:22,610 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:22,611 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:22,618 INFO L354 Elim1Store]: treesize reduction 43, result has 2.3 percent of original size [2021-11-23 02:04:22,618 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 5 select indices, 5 select index equivalence classes, 5 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 7 case distinctions, treesize of input 377 treesize of output 317 [2021-11-23 02:04:22,818 WARN L221 IntervalDomain]: Interval conversion did not stabilize in 12 iterations. Over-approximation may be very coarse. [2021-11-23 02:04:22,824 WARN L221 IntervalDomain]: Interval conversion did not stabilize in 12 iterations. Over-approximation may be very coarse. [2021-11-23 02:04:22,846 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 [2021-11-23 02:04:22,851 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:22,851 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 35 treesize of output 34 [2021-11-23 02:04:23,008 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:04:23,478 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '858#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (= ~MAX~0 100000) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= |ULTIMATE.start_main_~low~0#1| 2) (<= ~SIZE~0 100000) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= 3 |ULTIMATE.start_main_~val2~0#1|) (= 7 |ULTIMATE.start_main_~val1~0#1|) (<= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 1) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-23 02:04:23,478 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:04:23,478 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:04:23,478 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 10, 10] total 17 [2021-11-23 02:04:23,478 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [307505358] [2021-11-23 02:04:23,479 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:04:23,479 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2021-11-23 02:04:23,479 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:04:23,480 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-11-23 02:04:23,480 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=141, Invalid=365, Unknown=0, NotChecked=0, Total=506 [2021-11-23 02:04:23,481 INFO L87 Difference]: Start difference. First operand 19 states and 20 transitions. Second operand has 17 states, 17 states have (on average 2.176470588235294) internal successors, (37), 17 states have internal predecessors, (37), 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) [2021-11-23 02:04:23,568 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:04:23,569 INFO L93 Difference]: Finished difference Result 35 states and 37 transitions. [2021-11-23 02:04:23,571 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-11-23 02:04:23,571 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 2.176470588235294) internal successors, (37), 17 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 18 [2021-11-23 02:04:23,572 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:04:23,572 INFO L225 Difference]: With dead ends: 35 [2021-11-23 02:04:23,572 INFO L226 Difference]: Without dead ends: 20 [2021-11-23 02:04:23,573 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 41 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 212 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=141, Invalid=365, Unknown=0, NotChecked=0, Total=506 [2021-11-23 02:04:23,573 INFO L933 BasicCegarLoop]: 6 mSDtfsCounter, 28 mSDsluCounter, 27 mSDsCounter, 0 mSdLazyCounter, 63 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 28 SdHoareTripleChecker+Valid, 33 SdHoareTripleChecker+Invalid, 76 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 63 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:04:23,574 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [28 Valid, 33 Invalid, 76 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 63 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 02:04:23,574 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2021-11-23 02:04:23,580 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2021-11-23 02:04:23,580 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) [2021-11-23 02:04:23,581 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 21 transitions. [2021-11-23 02:04:23,581 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 21 transitions. Word has length 18 [2021-11-23 02:04:23,586 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:04:23,587 INFO L470 AbstractCegarLoop]: Abstraction has 20 states and 21 transitions. [2021-11-23 02:04:23,587 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 17 states have (on average 2.176470588235294) internal successors, (37), 17 states have internal predecessors, (37), 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) [2021-11-23 02:04:23,587 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 21 transitions. [2021-11-23 02:04:23,588 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2021-11-23 02:04:23,588 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:04:23,588 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 1, 1, 1, 1, 1] [2021-11-23 02:04:23,636 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_56ece289-cfcb-42a3-8cd0-16fb652fd41e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-23 02:04:23,802 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_56ece289-cfcb-42a3-8cd0-16fb652fd41e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:04:23,803 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:04:23,803 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:04:23,803 INFO L85 PathProgramCache]: Analyzing trace with hash -534422903, now seen corresponding path program 5 times [2021-11-23 02:04:23,803 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:04:23,804 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [973688827] [2021-11-23 02:04:23,804 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:04:23,804 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:04:23,858 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:04:24,186 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:04:24,186 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:04:24,186 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [973688827] [2021-11-23 02:04:24,186 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [973688827] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:04:24,186 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2024872129] [2021-11-23 02:04:24,187 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 02:04:24,187 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:04:24,187 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_56ece289-cfcb-42a3-8cd0-16fb652fd41e/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:04:24,195 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_56ece289-cfcb-42a3-8cd0-16fb652fd41e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:04:24,196 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_56ece289-cfcb-42a3-8cd0-16fb652fd41e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-23 02:04:24,247 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-11-23 02:04:24,247 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:04:24,248 INFO L263 TraceCheckSpWp]: Trace formula consists of 110 conjuncts, 30 conjunts are in the unsatisfiable core [2021-11-23 02:04:24,250 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:04:24,276 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 [2021-11-23 02:04:24,380 INFO L354 Elim1Store]: treesize reduction 176, result has 17.4 percent of original size [2021-11-23 02:04:24,380 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 66 treesize of output 83 [2021-11-23 02:04:24,395 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:24,396 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 34 treesize of output 16 [2021-11-23 02:04:24,444 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:24,445 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:24,446 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:24,446 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 3 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 58 treesize of output 22 [2021-11-23 02:04:24,626 INFO L354 Elim1Store]: treesize reduction 365, result has 14.3 percent of original size [2021-11-23 02:04:24,626 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 5 new quantified variables, introduced 8 case distinctions, treesize of input 122 treesize of output 127 [2021-11-23 02:04:24,688 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:24,689 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:24,690 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:24,691 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 3 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 55 treesize of output 28 [2021-11-23 02:04:24,733 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:24,734 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:24,735 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:24,736 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:24,737 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:24,738 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:24,738 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 6 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 0 case distinctions, treesize of input 123 treesize of output 51 [2021-11-23 02:04:24,966 INFO L354 Elim1Store]: treesize reduction 545, result has 13.4 percent of original size [2021-11-23 02:04:24,967 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 6 new quantified variables, introduced 13 case distinctions, treesize of input 130 treesize of output 132 [2021-11-23 02:04:25,000 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:25,001 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:25,002 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:25,003 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:25,004 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:25,005 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:25,006 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 6 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 0 case distinctions, treesize of input 85 treesize of output 49 [2021-11-23 02:04:25,035 INFO L354 Elim1Store]: treesize reduction 108, result has 0.9 percent of original size [2021-11-23 02:04:25,036 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 160 treesize of output 61 [2021-11-23 02:04:25,629 INFO L354 Elim1Store]: treesize reduction 166, result has 1.8 percent of original size [2021-11-23 02:04:25,630 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 5 select indices, 5 select index equivalence classes, 0 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 10 case distinctions, treesize of input 114 treesize of output 48 [2021-11-23 02:04:25,667 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 6 proven. 19 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:04:25,667 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:04:25,999 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 63 treesize of output 61 [2021-11-23 02:04:26,004 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 3434 treesize of output 3426 [2021-11-23 02:04:26,712 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 25 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:04:26,713 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2024872129] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:04:26,713 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2122932375] [2021-11-23 02:04:26,715 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-23 02:04:26,715 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:04:26,715 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:04:26,716 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:04:26,716 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:04:26,778 INFO L354 Elim1Store]: treesize reduction 36, result has 43.8 percent of original size [2021-11-23 02:04:26,778 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 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 24 treesize of output 44 [2021-11-23 02:04:26,820 INFO L354 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2021-11-23 02:04:26,820 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2021-11-23 02:04:26,851 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:26,852 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 2 select indices, 2 select index equivalence classes, 7 disjoint index pairs (out of 1 index pairs), introduced 4 new quantified variables, introduced 0 case distinctions, treesize of input 65 treesize of output 87 [2021-11-23 02:04:26,884 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 42 treesize of output 21 [2021-11-23 02:04:26,906 WARN L234 Elim1Store]: Array PQE input equivalent to false [2021-11-23 02:04:26,988 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:26,991 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:26,998 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:27,000 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:27,003 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:27,004 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:27,006 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:27,082 INFO L354 Elim1Store]: treesize reduction 399, result has 16.9 percent of original size [2021-11-23 02:04:27,082 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 4 select indices, 4 select index equivalence classes, 8 disjoint index pairs (out of 6 index pairs), introduced 6 new quantified variables, introduced 11 case distinctions, treesize of input 312 treesize of output 374 [2021-11-23 02:04:27,360 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:27,363 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:27,365 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:27,366 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:27,367 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:27,390 INFO L354 Elim1Store]: treesize reduction 53, result has 25.4 percent of original size [2021-11-23 02:04:27,391 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 5 select indices, 5 select index equivalence classes, 6 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 8 case distinctions, treesize of input 590 treesize of output 538 [2021-11-23 02:04:27,889 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:27,890 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:27,891 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 02:04:27,894 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:27,895 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:27,901 INFO L354 Elim1Store]: treesize reduction 43, result has 2.3 percent of original size [2021-11-23 02:04:27,901 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 5 select indices, 5 select index equivalence classes, 5 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 7 case distinctions, treesize of input 602 treesize of output 551 [2021-11-23 02:04:28,187 WARN L221 IntervalDomain]: Interval conversion did not stabilize in 12 iterations. Over-approximation may be very coarse. [2021-11-23 02:04:28,191 WARN L221 IntervalDomain]: Interval conversion did not stabilize in 12 iterations. Over-approximation may be very coarse. [2021-11-23 02:04:28,214 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 [2021-11-23 02:04:28,220 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:28,221 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 42 treesize of output 41 [2021-11-23 02:04:28,372 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:04:28,939 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1081#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (= ~MAX~0 100000) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= |ULTIMATE.start_main_~low~0#1| 2) (<= ~SIZE~0 100000) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= 3 |ULTIMATE.start_main_~val2~0#1|) (= 7 |ULTIMATE.start_main_~val1~0#1|) (<= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 1) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-23 02:04:28,939 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:04:28,940 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:04:28,940 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12] total 31 [2021-11-23 02:04:28,940 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1283712433] [2021-11-23 02:04:28,940 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:04:28,940 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 31 states [2021-11-23 02:04:28,941 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:04:28,941 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2021-11-23 02:04:28,942 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=199, Invalid=1133, Unknown=0, NotChecked=0, Total=1332 [2021-11-23 02:04:28,942 INFO L87 Difference]: Start difference. First operand 20 states and 21 transitions. Second operand has 31 states, 31 states have (on average 1.6774193548387097) internal successors, (52), 31 states have internal predecessors, (52), 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) [2021-11-23 02:04:31,547 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:04:31,548 INFO L93 Difference]: Finished difference Result 25 states and 26 transitions. [2021-11-23 02:04:31,548 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-11-23 02:04:31,549 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 31 states have (on average 1.6774193548387097) internal successors, (52), 31 states have internal predecessors, (52), 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 [2021-11-23 02:04:31,549 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:04:31,550 INFO L225 Difference]: With dead ends: 25 [2021-11-23 02:04:31,550 INFO L226 Difference]: Without dead ends: 23 [2021-11-23 02:04:31,551 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 34 SyntacticMatches, 1 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 564 ImplicationChecksByTransitivity, 3.8s TimeCoverageRelationStatistics Valid=397, Invalid=1955, Unknown=0, NotChecked=0, Total=2352 [2021-11-23 02:04:31,551 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 0 mSDsluCounter, 36 mSDsCounter, 0 mSdLazyCounter, 51 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 37 SdHoareTripleChecker+Invalid, 96 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 51 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 34 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:04:31,552 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 37 Invalid, 96 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 51 Invalid, 0 Unknown, 34 Unchecked, 0.1s Time] [2021-11-23 02:04:31,553 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2021-11-23 02:04:31,558 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2021-11-23 02:04:31,558 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23 states, 22 states have (on average 1.0909090909090908) internal successors, (24), 22 states have internal predecessors, (24), 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) [2021-11-23 02:04:31,559 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 24 transitions. [2021-11-23 02:04:31,559 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 24 transitions. Word has length 19 [2021-11-23 02:04:31,559 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:04:31,559 INFO L470 AbstractCegarLoop]: Abstraction has 23 states and 24 transitions. [2021-11-23 02:04:31,560 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 31 states, 31 states have (on average 1.6774193548387097) internal successors, (52), 31 states have internal predecessors, (52), 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) [2021-11-23 02:04:31,560 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 24 transitions. [2021-11-23 02:04:31,561 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-11-23 02:04:31,561 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:04:31,561 INFO L514 BasicCegarLoop]: trace histogram [5, 4, 4, 4, 1, 1, 1, 1, 1] [2021-11-23 02:04:31,590 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_56ece289-cfcb-42a3-8cd0-16fb652fd41e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-11-23 02:04:31,761 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_56ece289-cfcb-42a3-8cd0-16fb652fd41e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:04:31,765 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:04:31,766 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:04:31,766 INFO L85 PathProgramCache]: Analyzing trace with hash 456280493, now seen corresponding path program 6 times [2021-11-23 02:04:31,766 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:04:31,766 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1409700730] [2021-11-23 02:04:31,766 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:04:31,766 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:04:31,790 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:04:31,879 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 16 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:04:31,879 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:04:31,879 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1409700730] [2021-11-23 02:04:31,879 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1409700730] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:04:31,879 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2071690973] [2021-11-23 02:04:31,880 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-23 02:04:31,880 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:04:31,880 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_56ece289-cfcb-42a3-8cd0-16fb652fd41e/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:04:31,881 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_56ece289-cfcb-42a3-8cd0-16fb652fd41e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:04:31,882 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_56ece289-cfcb-42a3-8cd0-16fb652fd41e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-11-23 02:04:31,924 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-23 02:04:31,924 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 02:04:31,925 INFO L263 TraceCheckSpWp]: Trace formula consists of 93 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-23 02:04:31,927 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:04:32,063 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 26 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:04:32,063 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:04:32,191 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 26 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:04:32,192 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2071690973] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:04:32,192 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1937810952] [2021-11-23 02:04:32,195 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-23 02:04:32,196 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:04:32,196 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:04:32,196 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:04:32,197 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 02:04:32,265 INFO L354 Elim1Store]: treesize reduction 36, result has 43.8 percent of original size [2021-11-23 02:04:32,266 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 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 24 treesize of output 44 [2021-11-23 02:04:32,327 INFO L354 Elim1Store]: treesize reduction 54, result has 34.1 percent of original size [2021-11-23 02:04:32,328 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 32 treesize of output 53 [2021-11-23 02:04:32,384 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:32,385 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 2 select indices, 2 select index equivalence classes, 7 disjoint index pairs (out of 1 index pairs), introduced 4 new quantified variables, introduced 0 case distinctions, treesize of input 65 treesize of output 87 [2021-11-23 02:04:32,422 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 14 [2021-11-23 02:04:32,440 WARN L234 Elim1Store]: Array PQE input equivalent to false [2021-11-23 02:04:32,538 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:32,542 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:32,547 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:32,550 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:32,553 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:32,554 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:32,556 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:32,668 INFO L354 Elim1Store]: treesize reduction 399, result has 16.9 percent of original size [2021-11-23 02:04:32,668 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 4 select indices, 4 select index equivalence classes, 8 disjoint index pairs (out of 6 index pairs), introduced 6 new quantified variables, introduced 11 case distinctions, treesize of input 312 treesize of output 374 [2021-11-23 02:04:32,812 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:32,816 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:32,818 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:32,820 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:32,822 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:32,848 INFO L354 Elim1Store]: treesize reduction 53, result has 25.4 percent of original size [2021-11-23 02:04:32,849 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 5 select indices, 5 select index equivalence classes, 6 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 8 case distinctions, treesize of input 365 treesize of output 338 [2021-11-23 02:04:33,109 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:33,110 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:33,111 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-23 02:04:33,112 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:33,113 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:33,139 INFO L354 Elim1Store]: treesize reduction 43, result has 2.3 percent of original size [2021-11-23 02:04:33,140 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 5 select indices, 5 select index equivalence classes, 5 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 7 case distinctions, treesize of input 377 treesize of output 317 [2021-11-23 02:04:33,415 WARN L221 IntervalDomain]: Interval conversion did not stabilize in 12 iterations. Over-approximation may be very coarse. [2021-11-23 02:04:33,419 WARN L221 IntervalDomain]: Interval conversion did not stabilize in 12 iterations. Over-approximation may be very coarse. [2021-11-23 02:04:33,441 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 [2021-11-23 02:04:33,446 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:33,446 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 35 treesize of output 34 [2021-11-23 02:04:33,631 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 02:04:34,179 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1328#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (= ~MAX~0 100000) (<= 1 ~SIZE~0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= |ULTIMATE.start_main_~low~0#1| 2) (<= ~SIZE~0 100000) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= 3 |ULTIMATE.start_main_~val2~0#1|) (= 7 |ULTIMATE.start_main_~val1~0#1|) (<= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 1) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (<= 0 |#StackHeapBarrier|) (= |#NULL.base| 0))' at error location [2021-11-23 02:04:34,179 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 02:04:34,179 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 02:04:34,179 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 12, 12] total 20 [2021-11-23 02:04:34,180 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1428218974] [2021-11-23 02:04:34,180 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 02:04:34,180 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2021-11-23 02:04:34,181 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:04:34,181 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-11-23 02:04:34,181 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=185, Invalid=465, Unknown=0, NotChecked=0, Total=650 [2021-11-23 02:04:34,182 INFO L87 Difference]: Start difference. First operand 23 states and 24 transitions. Second operand has 20 states, 20 states have (on average 2.25) internal successors, (45), 20 states have internal predecessors, (45), 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) [2021-11-23 02:04:34,270 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:04:34,270 INFO L93 Difference]: Finished difference Result 42 states and 44 transitions. [2021-11-23 02:04:34,271 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-11-23 02:04:34,271 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 2.25) internal successors, (45), 20 states have internal predecessors, (45), 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 22 [2021-11-23 02:04:34,271 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:04:34,272 INFO L225 Difference]: With dead ends: 42 [2021-11-23 02:04:34,272 INFO L226 Difference]: Without dead ends: 24 [2021-11-23 02:04:34,272 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 76 GetRequests, 52 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 287 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=185, Invalid=465, Unknown=0, NotChecked=0, Total=650 [2021-11-23 02:04:34,273 INFO L933 BasicCegarLoop]: 7 mSDtfsCounter, 32 mSDsluCounter, 32 mSDsCounter, 0 mSdLazyCounter, 94 mSolverCounterSat, 16 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 32 SdHoareTripleChecker+Valid, 39 SdHoareTripleChecker+Invalid, 110 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 16 IncrementalHoareTripleChecker+Valid, 94 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 02:04:34,273 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [32 Valid, 39 Invalid, 110 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [16 Valid, 94 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 02:04:34,274 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2021-11-23 02:04:34,280 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2021-11-23 02:04:34,280 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 23 states have (on average 1.0869565217391304) internal successors, (25), 23 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:04:34,281 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 25 transitions. [2021-11-23 02:04:34,281 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 25 transitions. Word has length 22 [2021-11-23 02:04:34,281 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:04:34,282 INFO L470 AbstractCegarLoop]: Abstraction has 24 states and 25 transitions. [2021-11-23 02:04:34,282 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 20 states have (on average 2.25) internal successors, (45), 20 states have internal predecessors, (45), 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) [2021-11-23 02:04:34,282 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 25 transitions. [2021-11-23 02:04:34,283 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2021-11-23 02:04:34,283 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:04:34,283 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 1, 1, 1, 1, 1] [2021-11-23 02:04:34,308 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_56ece289-cfcb-42a3-8cd0-16fb652fd41e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-11-23 02:04:34,486 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_56ece289-cfcb-42a3-8cd0-16fb652fd41e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable8 [2021-11-23 02:04:34,487 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:04:34,487 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:04:34,487 INFO L85 PathProgramCache]: Analyzing trace with hash 1836828791, now seen corresponding path program 7 times [2021-11-23 02:04:34,488 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:04:34,488 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [553643214] [2021-11-23 02:04:34,488 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:04:34,488 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:04:34,573 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:04:34,906 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 0 proven. 41 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:04:34,906 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:04:34,906 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [553643214] [2021-11-23 02:04:34,906 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [553643214] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:04:34,907 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1941129715] [2021-11-23 02:04:34,907 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-23 02:04:34,907 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:04:34,907 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_56ece289-cfcb-42a3-8cd0-16fb652fd41e/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:04:34,908 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_56ece289-cfcb-42a3-8cd0-16fb652fd41e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:04:34,939 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_56ece289-cfcb-42a3-8cd0-16fb652fd41e/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-11-23 02:04:34,975 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:04:34,977 INFO L263 TraceCheckSpWp]: Trace formula consists of 125 conjuncts, 38 conjunts are in the unsatisfiable core [2021-11-23 02:04:34,980 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:04:35,019 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 [2021-11-23 02:04:35,120 INFO L354 Elim1Store]: treesize reduction 176, result has 17.4 percent of original size [2021-11-23 02:04:35,121 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 66 treesize of output 83 [2021-11-23 02:04:35,166 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:35,167 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:35,169 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:35,170 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 3 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 46 treesize of output 19 [2021-11-23 02:04:35,205 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:35,206 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 46 treesize of output 19 [2021-11-23 02:04:35,446 INFO L354 Elim1Store]: treesize reduction 365, result has 14.3 percent of original size [2021-11-23 02:04:35,446 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 5 new quantified variables, introduced 8 case distinctions, treesize of input 122 treesize of output 127 [2021-11-23 02:04:35,488 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:35,489 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:35,490 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:35,491 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:35,492 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:35,492 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:35,493 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 6 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 0 case distinctions, treesize of input 67 treesize of output 31 [2021-11-23 02:04:35,544 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:35,545 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:35,546 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:35,547 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 3 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 79 treesize of output 34 [2021-11-23 02:04:35,860 INFO L354 Elim1Store]: treesize reduction 554, result has 13.3 percent of original size [2021-11-23 02:04:35,860 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 6 new quantified variables, introduced 13 case distinctions, treesize of input 146 treesize of output 157 [2021-11-23 02:04:35,932 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:35,934 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:35,935 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:35,936 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:35,937 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:35,938 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:35,940 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 6 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 0 case distinctions, treesize of input 76 treesize of output 40 [2021-11-23 02:04:36,005 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:36,006 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:36,007 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:36,008 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:36,009 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:36,010 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:36,011 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:36,012 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:36,013 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:36,014 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:36,015 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 5 select indices, 5 select index equivalence classes, 10 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 0 case distinctions, treesize of input 168 treesize of output 69 [2021-11-23 02:04:36,225 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:36,226 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:36,228 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:36,229 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:36,231 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:36,232 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:36,233 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:36,234 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:36,236 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:36,237 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:36,238 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:36,239 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:36,241 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:36,242 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:36,243 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:36,247 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-23 02:04:36,248 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 5 select indices, 5 select index equivalence classes, 15 disjoint index pairs (out of 10 index pairs), introduced 7 new quantified variables, introduced 10 case distinctions, treesize of input 151 treesize of output 159 [2021-11-23 02:04:36,272 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:36,273 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:36,274 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:36,275 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:36,276 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:36,277 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:36,278 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:36,279 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:36,280 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:36,281 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:36,282 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 5 select indices, 5 select index equivalence classes, 10 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 0 case distinctions, treesize of input 127 treesize of output 73 [2021-11-23 02:04:36,373 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:36,374 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:36,375 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:36,376 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:36,377 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:36,378 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:36,379 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:36,380 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:36,381 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:36,382 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-23 02:04:36,384 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-23 02:04:36,385 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 5 select indices, 5 select index equivalence classes, 10 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 10 case distinctions, treesize of input 202 treesize of output 85 [2021-11-23 02:04:37,370 INFO L354 Elim1Store]: treesize reduction 218, result has 1.4 percent of original size [2021-11-23 02:04:37,371 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 6 select indices, 6 select index equivalence classes, 0 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 15 case distinctions, treesize of input 124 treesize of output 51 [2021-11-23 02:04:37,432 INFO L134 CoverageAnalysis]: Checked inductivity of 41 backedges. 10 proven. 31 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:04:37,432 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:04:38,041 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 79 treesize of output 77 [2021-11-23 02:04:38,067 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7079916 treesize of output 7075820 [2021-11-23 02:04:56,031 WARN L227 SmtUtils]: Spent 17.96s on a formula simplification that was a NOOP. DAG size: 746 (called from [L1066] de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher.simplify) [2021-11-23 02:11:58,335 WARN L227 SmtUtils]: Spent 6.75m on a formula simplification. DAG size of input: 745 DAG size of output: 744 (called from [L1066] de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher.simplify) [2021-11-23 02:13:19,005 WARN L227 SmtUtils]: Spent 34.86s on a formula simplification. DAG size of input: 703 DAG size of output: 701 (called from [L1066] de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher.simplify) [2021-11-23 02:14:41,283 WARN L227 SmtUtils]: Spent 58.78s on a formula simplification. DAG size of input: 701 DAG size of output: 701 (called from [L1066] de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher.simplify) [2021-11-23 02:16:09,807 WARN L227 SmtUtils]: Spent 53.73s on a formula simplification. DAG size of input: 676 DAG size of output: 676 (called from [L1066] de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher.simplify)