./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/loop-acceleration/array_2-1.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 53f42b1a Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_942c7569-ce20-4a70-8ae9-3ae6500cbaba/bin/utaipan-TEXQjIfE4P/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_942c7569-ce20-4a70-8ae9-3ae6500cbaba/bin/utaipan-TEXQjIfE4P/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_942c7569-ce20-4a70-8ae9-3ae6500cbaba/bin/utaipan-TEXQjIfE4P/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_942c7569-ce20-4a70-8ae9-3ae6500cbaba/bin/utaipan-TEXQjIfE4P/config/TaipanReach.xml -i ../../sv-benchmarks/c/loop-acceleration/array_2-1.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_942c7569-ce20-4a70-8ae9-3ae6500cbaba/bin/utaipan-TEXQjIfE4P/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_942c7569-ce20-4a70-8ae9-3ae6500cbaba/bin/utaipan-TEXQjIfE4P --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash d1726b0c52a0be10cb8b374bfde8cdbfe3513d4b934203f7e56a3a1bce5e9e5b --- Real Ultimate output --- This is Ultimate 0.2.1-dev-53f42b1 [2021-11-21 00:33:51,358 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-21 00:33:51,360 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-21 00:33:51,393 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-21 00:33:51,394 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-21 00:33:51,396 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-21 00:33:51,398 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-21 00:33:51,401 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-21 00:33:51,403 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-21 00:33:51,405 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-21 00:33:51,406 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-21 00:33:51,408 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-21 00:33:51,409 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-21 00:33:51,411 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-21 00:33:51,413 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-21 00:33:51,415 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-21 00:33:51,416 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-21 00:33:51,418 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-21 00:33:51,420 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-21 00:33:51,424 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-21 00:33:51,426 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-21 00:33:51,428 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-21 00:33:51,431 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-21 00:33:51,432 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-21 00:33:51,437 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-21 00:33:51,437 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-21 00:33:51,438 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-21 00:33:51,439 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-21 00:33:51,440 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-21 00:33:51,442 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-21 00:33:51,442 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-21 00:33:51,444 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-21 00:33:51,445 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-21 00:33:51,446 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-21 00:33:51,448 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-21 00:33:51,448 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-21 00:33:51,450 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-21 00:33:51,450 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-21 00:33:51,451 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-21 00:33:51,452 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-21 00:33:51,454 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-21 00:33:51,455 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_942c7569-ce20-4a70-8ae9-3ae6500cbaba/bin/utaipan-TEXQjIfE4P/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-21 00:33:51,484 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-21 00:33:51,484 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-21 00:33:51,485 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-21 00:33:51,486 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-21 00:33:51,487 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-21 00:33:51,487 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-21 00:33:51,488 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-21 00:33:51,488 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-21 00:33:51,489 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-21 00:33:51,489 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-21 00:33:51,490 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-21 00:33:51,490 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-21 00:33:51,491 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-21 00:33:51,491 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-21 00:33:51,492 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-21 00:33:51,493 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-21 00:33:51,493 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-21 00:33:51,494 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-21 00:33:51,495 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-21 00:33:51,495 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-21 00:33:51,495 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-21 00:33:51,496 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-21 00:33:51,496 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-21 00:33:51,496 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-21 00:33:51,497 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-21 00:33:51,497 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-21 00:33:51,497 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-21 00:33:51,498 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-21 00:33:51,498 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-21 00:33:51,498 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-21 00:33:51,499 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-21 00:33:51,499 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-21 00:33:51,500 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-21 00:33:51,500 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-21 00:33:51,500 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-21 00:33:51,501 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-21 00:33:51,501 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-21 00:33:51,501 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-21 00:33:51,502 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-21 00:33:51,502 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-21 00:33:51,502 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-21 00:33:51,503 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_942c7569-ce20-4a70-8ae9-3ae6500cbaba/bin/utaipan-TEXQjIfE4P/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_942c7569-ce20-4a70-8ae9-3ae6500cbaba/bin/utaipan-TEXQjIfE4P Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> d1726b0c52a0be10cb8b374bfde8cdbfe3513d4b934203f7e56a3a1bce5e9e5b [2021-11-21 00:33:51,803 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-21 00:33:51,828 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-21 00:33:51,831 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-21 00:33:51,833 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-21 00:33:51,834 INFO L275 PluginConnector]: CDTParser initialized [2021-11-21 00:33:51,836 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_942c7569-ce20-4a70-8ae9-3ae6500cbaba/bin/utaipan-TEXQjIfE4P/../../sv-benchmarks/c/loop-acceleration/array_2-1.i [2021-11-21 00:33:51,914 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_942c7569-ce20-4a70-8ae9-3ae6500cbaba/bin/utaipan-TEXQjIfE4P/data/e1f6062ac/e45e337b228f4585963b6df0e9dea950/FLAG7417d3c8c [2021-11-21 00:33:52,419 INFO L306 CDTParser]: Found 1 translation units. [2021-11-21 00:33:52,419 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_942c7569-ce20-4a70-8ae9-3ae6500cbaba/sv-benchmarks/c/loop-acceleration/array_2-1.i [2021-11-21 00:33:52,427 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_942c7569-ce20-4a70-8ae9-3ae6500cbaba/bin/utaipan-TEXQjIfE4P/data/e1f6062ac/e45e337b228f4585963b6df0e9dea950/FLAG7417d3c8c [2021-11-21 00:33:52,790 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_942c7569-ce20-4a70-8ae9-3ae6500cbaba/bin/utaipan-TEXQjIfE4P/data/e1f6062ac/e45e337b228f4585963b6df0e9dea950 [2021-11-21 00:33:52,792 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-21 00:33:52,794 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-21 00:33:52,800 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-21 00:33:52,801 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-21 00:33:52,806 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-21 00:33:52,807 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.11 12:33:52" (1/1) ... [2021-11-21 00:33:52,809 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@efe3ceb and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:33:52, skipping insertion in model container [2021-11-21 00:33:52,809 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.11 12:33:52" (1/1) ... [2021-11-21 00:33:52,821 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-21 00:33:52,835 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-21 00:33:53,032 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_942c7569-ce20-4a70-8ae9-3ae6500cbaba/sv-benchmarks/c/loop-acceleration/array_2-1.i[849,862] [2021-11-21 00:33:53,047 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-21 00:33:53,056 INFO L203 MainTranslator]: Completed pre-run [2021-11-21 00:33:53,071 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_942c7569-ce20-4a70-8ae9-3ae6500cbaba/sv-benchmarks/c/loop-acceleration/array_2-1.i[849,862] [2021-11-21 00:33:53,078 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-21 00:33:53,093 INFO L208 MainTranslator]: Completed translation [2021-11-21 00:33:53,094 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:33:53 WrapperNode [2021-11-21 00:33:53,094 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-21 00:33:53,095 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-21 00:33:53,095 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-21 00:33:53,096 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-21 00:33:53,105 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:33:53" (1/1) ... [2021-11-21 00:33:53,114 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:33:53" (1/1) ... [2021-11-21 00:33:53,138 INFO L137 Inliner]: procedures = 16, calls = 17, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 54 [2021-11-21 00:33:53,139 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-21 00:33:53,140 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-21 00:33:53,140 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-21 00:33:53,140 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-21 00:33:53,150 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:33:53" (1/1) ... [2021-11-21 00:33:53,150 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:33:53" (1/1) ... [2021-11-21 00:33:53,152 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:33:53" (1/1) ... [2021-11-21 00:33:53,153 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:33:53" (1/1) ... [2021-11-21 00:33:53,159 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:33:53" (1/1) ... [2021-11-21 00:33:53,164 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:33:53" (1/1) ... [2021-11-21 00:33:53,166 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:33:53" (1/1) ... [2021-11-21 00:33:53,168 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-21 00:33:53,169 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-21 00:33:53,169 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-21 00:33:53,169 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-21 00:33:53,171 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:33:53" (1/1) ... [2021-11-21 00:33:53,180 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-21 00:33:53,196 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_942c7569-ce20-4a70-8ae9-3ae6500cbaba/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:33:53,210 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_942c7569-ce20-4a70-8ae9-3ae6500cbaba/bin/utaipan-TEXQjIfE4P/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-21 00:33:53,214 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_942c7569-ce20-4a70-8ae9-3ae6500cbaba/bin/utaipan-TEXQjIfE4P/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-21 00:33:53,261 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-21 00:33:53,261 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-21 00:33:53,262 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-11-21 00:33:53,262 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-11-21 00:33:53,262 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-21 00:33:53,262 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-21 00:33:53,262 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-11-21 00:33:53,263 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-11-21 00:33:53,343 INFO L236 CfgBuilder]: Building ICFG [2021-11-21 00:33:53,345 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-21 00:33:53,484 INFO L277 CfgBuilder]: Performing block encoding [2021-11-21 00:33:53,518 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-21 00:33:53,518 INFO L301 CfgBuilder]: Removed 2 assume(true) statements. [2021-11-21 00:33:53,521 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.11 12:33:53 BoogieIcfgContainer [2021-11-21 00:33:53,521 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-21 00:33:53,523 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-21 00:33:53,523 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-21 00:33:53,534 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-21 00:33:53,534 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.11 12:33:52" (1/3) ... [2021-11-21 00:33:53,535 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@39e826f2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.11 12:33:53, skipping insertion in model container [2021-11-21 00:33:53,536 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:33:53" (2/3) ... [2021-11-21 00:33:53,536 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@39e826f2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.11 12:33:53, skipping insertion in model container [2021-11-21 00:33:53,536 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.11 12:33:53" (3/3) ... [2021-11-21 00:33:53,539 INFO L111 eAbstractionObserver]: Analyzing ICFG array_2-1.i [2021-11-21 00:33:53,549 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-21 00:33:53,550 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-21 00:33:53,625 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-21 00:33:53,638 INFO L339 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mLoopAccelerationTechnique=FAST_UPR [2021-11-21 00:33:53,638 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-21 00:33:53,669 INFO L276 IsEmpty]: Start isEmpty. Operand has 8 states, 6 states have (on average 1.6666666666666667) internal successors, (10), 7 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:33:53,680 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2021-11-21 00:33:53,680 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:33:53,681 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1] [2021-11-21 00:33:53,682 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:33:53,695 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:33:53,695 INFO L85 PathProgramCache]: Analyzing trace with hash 72740109, now seen corresponding path program 1 times [2021-11-21 00:33:53,707 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:33:53,708 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2015199655] [2021-11-21 00:33:53,708 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:33:53,709 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:33:53,816 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:33:53,880 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:33:53,881 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:33:53,881 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2015199655] [2021-11-21 00:33:53,882 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2015199655] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:33:53,882 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 00:33:53,882 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-21 00:33:53,884 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1137453047] [2021-11-21 00:33:53,885 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:33:53,889 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-21 00:33:53,890 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:33:53,919 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-21 00:33:53,920 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-21 00:33:53,922 INFO L87 Difference]: Start difference. First operand has 8 states, 6 states have (on average 1.6666666666666667) internal successors, (10), 7 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 3 states, 3 states have (on average 1.6666666666666667) internal successors, (5), 2 states have internal predecessors, (5), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:33:53,965 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:33:53,965 INFO L93 Difference]: Finished difference Result 16 states and 21 transitions. [2021-11-21 00:33:53,967 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-21 00:33:53,968 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 1.6666666666666667) internal successors, (5), 2 states have internal predecessors, (5), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 5 [2021-11-21 00:33:53,969 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:33:53,978 INFO L225 Difference]: With dead ends: 16 [2021-11-21 00:33:53,978 INFO L226 Difference]: Without dead ends: 8 [2021-11-21 00:33:53,981 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-21 00:33:53,986 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 0 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 10 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 6 SdHoareTripleChecker+Invalid, 12 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 10 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-21 00:33:53,988 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 6 Invalid, 12 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 10 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-21 00:33:54,011 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8 states. [2021-11-21 00:33:54,035 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8 to 8. [2021-11-21 00:33:54,036 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 8 states, 7 states have (on average 1.2857142857142858) internal successors, (9), 7 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:33:54,052 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8 states to 8 states and 9 transitions. [2021-11-21 00:33:54,053 INFO L78 Accepts]: Start accepts. Automaton has 8 states and 9 transitions. Word has length 5 [2021-11-21 00:33:54,054 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:33:54,054 INFO L470 AbstractCegarLoop]: Abstraction has 8 states and 9 transitions. [2021-11-21 00:33:54,054 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 1.6666666666666667) internal successors, (5), 2 states have internal predecessors, (5), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:33:54,055 INFO L276 IsEmpty]: Start isEmpty. Operand 8 states and 9 transitions. [2021-11-21 00:33:54,055 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2021-11-21 00:33:54,055 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:33:54,055 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:33:54,056 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-21 00:33:54,056 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:33:54,057 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:33:54,057 INFO L85 PathProgramCache]: Analyzing trace with hash 957045146, now seen corresponding path program 1 times [2021-11-21 00:33:54,058 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:33:54,058 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [180321698] [2021-11-21 00:33:54,058 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:33:54,059 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:33:54,078 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:33:54,117 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-21 00:33:54,118 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:33:54,118 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [180321698] [2021-11-21 00:33:54,119 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [180321698] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:33:54,119 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1205666094] [2021-11-21 00:33:54,119 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:33:54,120 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:33:54,120 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_942c7569-ce20-4a70-8ae9-3ae6500cbaba/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:33:54,122 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_942c7569-ce20-4a70-8ae9-3ae6500cbaba/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:33:54,166 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_942c7569-ce20-4a70-8ae9-3ae6500cbaba/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-21 00:33:54,234 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:33:54,236 INFO L263 TraceCheckSpWp]: Trace formula consists of 66 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-21 00:33:54,262 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:33:54,328 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-21 00:33:54,328 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:33:54,372 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-21 00:33:54,373 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1205666094] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:33:54,373 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2027700663] [2021-11-21 00:33:54,416 INFO L159 IcfgInterpreter]: Started Sifa with 6 locations of interest [2021-11-21 00:33:54,416 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:33:54,440 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:33:54,449 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:33:54,450 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:33:54,598 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:33:54,600 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:33:54,668 INFO L354 Elim1Store]: treesize reduction 37, result has 32.7 percent of original size [2021-11-21 00:33:54,670 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 20 treesize of output 34 [2021-11-21 00:33:54,732 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:33:54,736 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:33:54,738 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:33:54,740 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:33:54,792 INFO L354 Elim1Store]: treesize reduction 60, result has 24.1 percent of original size [2021-11-21 00:33:54,793 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 39 treesize of output 53 [2021-11-21 00:33:54,927 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:33:54,929 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:33:54,932 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 6 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 73 treesize of output 61 [2021-11-21 00:33:55,278 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:33:55,281 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:33:55,291 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:33:55,295 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:33:55,296 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:33:55,298 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:33:55,301 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 00:33:55,306 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:33:55,307 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 00:33:55,368 INFO L354 Elim1Store]: treesize reduction 142, result has 12.3 percent of original size [2021-11-21 00:33:55,370 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 4 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 7 case distinctions, treesize of input 300 treesize of output 268 [2021-11-21 00:33:55,830 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 00:33:55,846 INFO L354 Elim1Store]: treesize reduction 18, result has 47.1 percent of original size [2021-11-21 00:33:55,847 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 1 case distinctions, treesize of input 59 treesize of output 45 [2021-11-21 00:33:56,021 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 00:33:56,037 INFO L354 Elim1Store]: treesize reduction 22, result has 35.3 percent of original size [2021-11-21 00:33:56,038 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 29 treesize of output 28 [2021-11-21 00:33:56,142 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:33:56,143 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:33:56,146 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:33:56,147 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 00:33:56,149 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 00:33:56,164 INFO L354 Elim1Store]: treesize reduction 30, result has 28.6 percent of original size [2021-11-21 00:33:56,164 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 61 treesize of output 66 [2021-11-21 00:33:56,249 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 00:33:56,261 INFO L354 Elim1Store]: treesize reduction 22, result has 35.3 percent of original size [2021-11-21 00:33:56,261 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 29 treesize of output 28 [2021-11-21 00:33:56,501 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:33:56,623 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:33:56,623 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:33:56,623 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3, 3] total 6 [2021-11-21 00:33:56,624 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [43732883] [2021-11-21 00:33:56,624 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 00:33:56,625 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-21 00:33:56,625 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:33:56,626 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-21 00:33:56,626 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=60, Unknown=0, NotChecked=0, Total=90 [2021-11-21 00:33:56,627 INFO L87 Difference]: Start difference. First operand 8 states and 9 transitions. Second operand has 7 states, 7 states have (on average 1.7142857142857142) internal successors, (12), 6 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:33:56,671 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:33:56,671 INFO L93 Difference]: Finished difference Result 19 states and 26 transitions. [2021-11-21 00:33:56,671 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-21 00:33:56,672 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 1.7142857142857142) internal successors, (12), 6 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 7 [2021-11-21 00:33:56,672 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:33:56,673 INFO L225 Difference]: With dead ends: 19 [2021-11-21 00:33:56,673 INFO L226 Difference]: Without dead ends: 14 [2021-11-21 00:33:56,674 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=30, Invalid=60, Unknown=0, NotChecked=0, Total=90 [2021-11-21 00:33:56,681 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 0 mSDsluCounter, 8 mSDsCounter, 0 mSdLazyCounter, 19 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 10 SdHoareTripleChecker+Invalid, 30 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 19 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-21 00:33:56,682 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 10 Invalid, 30 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 19 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-21 00:33:56,685 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2021-11-21 00:33:56,694 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2021-11-21 00:33:56,695 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 14 states, 13 states have (on average 1.1538461538461537) internal successors, (15), 13 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:33:56,696 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 15 transitions. [2021-11-21 00:33:56,697 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 15 transitions. Word has length 7 [2021-11-21 00:33:56,697 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:33:56,698 INFO L470 AbstractCegarLoop]: Abstraction has 14 states and 15 transitions. [2021-11-21 00:33:56,698 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 1.7142857142857142) internal successors, (12), 6 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:33:56,698 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 15 transitions. [2021-11-21 00:33:56,699 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2021-11-21 00:33:56,699 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:33:56,700 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 1, 1, 1, 1, 1] [2021-11-21 00:33:56,739 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_942c7569-ce20-4a70-8ae9-3ae6500cbaba/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-21 00:33:56,915 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_942c7569-ce20-4a70-8ae9-3ae6500cbaba/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:33:56,916 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:33:56,917 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:33:56,917 INFO L85 PathProgramCache]: Analyzing trace with hash 104061389, now seen corresponding path program 2 times [2021-11-21 00:33:56,917 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:33:56,917 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1031435489] [2021-11-21 00:33:56,917 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:33:56,917 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:33:56,984 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:33:57,076 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-21 00:33:57,076 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:33:57,076 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1031435489] [2021-11-21 00:33:57,077 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1031435489] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:33:57,077 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [509004357] [2021-11-21 00:33:57,077 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 00:33:57,077 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:33:57,077 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_942c7569-ce20-4a70-8ae9-3ae6500cbaba/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:33:57,080 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_942c7569-ce20-4a70-8ae9-3ae6500cbaba/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:33:57,107 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_942c7569-ce20-4a70-8ae9-3ae6500cbaba/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-21 00:33:57,168 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-11-21 00:33:57,168 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 00:33:57,170 INFO L263 TraceCheckSpWp]: Trace formula consists of 108 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-21 00:33:57,171 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:33:57,219 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-21 00:33:57,219 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:33:57,290 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-21 00:33:57,291 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [509004357] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:33:57,291 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2061156247] [2021-11-21 00:33:57,306 INFO L159 IcfgInterpreter]: Started Sifa with 6 locations of interest [2021-11-21 00:33:57,307 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:33:57,308 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:33:57,308 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:33:57,308 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:33:57,344 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:33:57,345 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:33:57,373 INFO L354 Elim1Store]: treesize reduction 37, result has 32.7 percent of original size [2021-11-21 00:33:57,373 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 20 treesize of output 34 [2021-11-21 00:33:57,414 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:33:57,416 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:33:57,418 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:33:57,419 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:33:57,450 INFO L354 Elim1Store]: treesize reduction 60, result has 24.1 percent of original size [2021-11-21 00:33:57,450 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 39 treesize of output 53 [2021-11-21 00:33:57,520 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:33:57,521 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:33:57,528 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 6 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 58 treesize of output 51 [2021-11-21 00:33:57,717 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:33:57,718 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:33:57,719 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 00:33:57,720 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 00:33:57,721 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 00:33:57,796 INFO L354 Elim1Store]: treesize reduction 250, result has 15.5 percent of original size [2021-11-21 00:33:57,797 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 2 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 9 case distinctions, treesize of input 280 treesize of output 270 [2021-11-21 00:33:58,693 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 00:33:58,705 INFO L354 Elim1Store]: treesize reduction 18, result has 47.1 percent of original size [2021-11-21 00:33:58,705 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 1 case distinctions, treesize of input 59 treesize of output 45 [2021-11-21 00:33:58,824 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 00:33:58,831 INFO L354 Elim1Store]: treesize reduction 17, result has 29.2 percent of original size [2021-11-21 00:33:58,832 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 19 treesize of output 18 [2021-11-21 00:33:58,910 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 00:33:58,912 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 00:33:58,954 INFO L354 Elim1Store]: treesize reduction 95, result has 34.9 percent of original size [2021-11-21 00:33:58,955 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 6 case distinctions, treesize of input 51 treesize of output 80 [2021-11-21 00:33:59,057 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 00:33:59,072 INFO L354 Elim1Store]: treesize reduction 22, result has 35.3 percent of original size [2021-11-21 00:33:59,073 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 29 treesize of output 28 [2021-11-21 00:33:59,272 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:33:59,390 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:33:59,390 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:33:59,390 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 12 [2021-11-21 00:33:59,390 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1235031785] [2021-11-21 00:33:59,391 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 00:33:59,391 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2021-11-21 00:33:59,391 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:33:59,392 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-11-21 00:33:59,392 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=87, Invalid=153, Unknown=0, NotChecked=0, Total=240 [2021-11-21 00:33:59,392 INFO L87 Difference]: Start difference. First operand 14 states and 15 transitions. Second operand has 13 states, 13 states have (on average 1.3846153846153846) internal successors, (18), 12 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:33:59,464 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:33:59,464 INFO L93 Difference]: Finished difference Result 34 states and 47 transitions. [2021-11-21 00:33:59,467 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-21 00:33:59,467 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 1.3846153846153846) internal successors, (18), 12 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 13 [2021-11-21 00:33:59,468 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:33:59,468 INFO L225 Difference]: With dead ends: 34 [2021-11-21 00:33:59,468 INFO L226 Difference]: Without dead ends: 26 [2021-11-21 00:33:59,469 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 29 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 61 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=87, Invalid=153, Unknown=0, NotChecked=0, Total=240 [2021-11-21 00:33:59,470 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 0 mSDsluCounter, 8 mSDsCounter, 0 mSdLazyCounter, 29 mSolverCounterSat, 30 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 10 SdHoareTripleChecker+Invalid, 59 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 30 IncrementalHoareTripleChecker+Valid, 29 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 00:33:59,470 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 10 Invalid, 59 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [30 Valid, 29 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 00:33:59,471 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2021-11-21 00:33:59,474 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2021-11-21 00:33:59,474 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 25 states have (on average 1.08) internal successors, (27), 25 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:33:59,479 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 27 transitions. [2021-11-21 00:33:59,479 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 27 transitions. Word has length 13 [2021-11-21 00:33:59,479 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:33:59,480 INFO L470 AbstractCegarLoop]: Abstraction has 26 states and 27 transitions. [2021-11-21 00:33:59,480 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 1.3846153846153846) internal successors, (18), 12 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:33:59,480 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 27 transitions. [2021-11-21 00:33:59,481 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2021-11-21 00:33:59,481 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:33:59,481 INFO L514 BasicCegarLoop]: trace histogram [10, 10, 1, 1, 1, 1, 1] [2021-11-21 00:33:59,523 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_942c7569-ce20-4a70-8ae9-3ae6500cbaba/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-21 00:33:59,702 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_942c7569-ce20-4a70-8ae9-3ae6500cbaba/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:33:59,703 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:33:59,703 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:33:59,703 INFO L85 PathProgramCache]: Analyzing trace with hash 777265389, now seen corresponding path program 3 times [2021-11-21 00:33:59,704 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:33:59,704 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1219702525] [2021-11-21 00:33:59,704 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:33:59,704 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:33:59,754 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:33:59,905 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2021-11-21 00:33:59,906 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:33:59,906 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1219702525] [2021-11-21 00:33:59,906 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1219702525] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:33:59,906 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1343496931] [2021-11-21 00:33:59,907 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-21 00:33:59,907 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:33:59,907 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_942c7569-ce20-4a70-8ae9-3ae6500cbaba/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:33:59,908 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_942c7569-ce20-4a70-8ae9-3ae6500cbaba/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:33:59,911 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_942c7569-ce20-4a70-8ae9-3ae6500cbaba/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-21 00:33:59,970 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-21 00:33:59,971 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 00:33:59,972 INFO L263 TraceCheckSpWp]: Trace formula consists of 192 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-21 00:33:59,974 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:34:00,032 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2021-11-21 00:34:00,032 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:34:00,266 INFO L134 CoverageAnalysis]: Checked inductivity of 110 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2021-11-21 00:34:00,266 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1343496931] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:34:00,266 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [6018279] [2021-11-21 00:34:00,268 INFO L159 IcfgInterpreter]: Started Sifa with 6 locations of interest [2021-11-21 00:34:00,269 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:34:00,269 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:34:00,269 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:34:00,269 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:34:00,287 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:34:00,288 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:34:00,315 INFO L354 Elim1Store]: treesize reduction 37, result has 32.7 percent of original size [2021-11-21 00:34:00,316 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 20 treesize of output 34 [2021-11-21 00:34:00,369 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:34:00,371 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:34:00,372 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:34:00,373 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:34:00,400 INFO L354 Elim1Store]: treesize reduction 60, result has 24.1 percent of original size [2021-11-21 00:34:00,400 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 39 treesize of output 53 [2021-11-21 00:34:00,468 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:34:00,469 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:34:00,471 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 58 treesize of output 51 [2021-11-21 00:34:00,599 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:34:00,600 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:34:00,601 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 00:34:00,602 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 00:34:00,603 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 00:34:00,668 INFO L354 Elim1Store]: treesize reduction 250, result has 15.5 percent of original size [2021-11-21 00:34:00,669 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 2 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 9 case distinctions, treesize of input 280 treesize of output 270 [2021-11-21 00:34:01,425 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 00:34:01,436 INFO L354 Elim1Store]: treesize reduction 18, result has 47.1 percent of original size [2021-11-21 00:34:01,437 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 1 case distinctions, treesize of input 59 treesize of output 45 [2021-11-21 00:34:01,587 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 00:34:01,596 INFO L354 Elim1Store]: treesize reduction 22, result has 35.3 percent of original size [2021-11-21 00:34:01,597 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 29 treesize of output 28 [2021-11-21 00:34:01,651 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:34:01,652 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:34:01,656 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:34:01,657 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 00:34:01,657 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 00:34:01,668 INFO L354 Elim1Store]: treesize reduction 30, result has 28.6 percent of original size [2021-11-21 00:34:01,668 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 61 treesize of output 66 [2021-11-21 00:34:01,733 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 00:34:01,741 INFO L354 Elim1Store]: treesize reduction 22, result has 35.3 percent of original size [2021-11-21 00:34:01,742 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 29 treesize of output 28 [2021-11-21 00:34:01,932 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:34:02,047 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:34:02,047 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:34:02,047 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12] total 24 [2021-11-21 00:34:02,047 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [709511113] [2021-11-21 00:34:02,047 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 00:34:02,048 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2021-11-21 00:34:02,048 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:34:02,048 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-11-21 00:34:02,049 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=309, Invalid=447, Unknown=0, NotChecked=0, Total=756 [2021-11-21 00:34:02,049 INFO L87 Difference]: Start difference. First operand 26 states and 27 transitions. Second operand has 25 states, 25 states have (on average 1.2) internal successors, (30), 24 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:34:02,175 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:34:02,175 INFO L93 Difference]: Finished difference Result 64 states and 89 transitions. [2021-11-21 00:34:02,176 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-11-21 00:34:02,177 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 1.2) internal successors, (30), 24 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 25 [2021-11-21 00:34:02,177 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:34:02,178 INFO L225 Difference]: With dead ends: 64 [2021-11-21 00:34:02,178 INFO L226 Difference]: Without dead ends: 50 [2021-11-21 00:34:02,179 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 85 GetRequests, 59 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 139 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=309, Invalid=447, Unknown=0, NotChecked=0, Total=756 [2021-11-21 00:34:02,180 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 0 mSDsluCounter, 8 mSDsCounter, 0 mSdLazyCounter, 55 mSolverCounterSat, 81 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 10 SdHoareTripleChecker+Invalid, 136 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 81 IncrementalHoareTripleChecker+Valid, 55 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 00:34:02,180 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 10 Invalid, 136 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [81 Valid, 55 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 00:34:02,181 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2021-11-21 00:34:02,187 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 50. [2021-11-21 00:34:02,187 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 50 states, 49 states have (on average 1.0408163265306123) internal successors, (51), 49 states have internal predecessors, (51), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:34:02,188 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 51 transitions. [2021-11-21 00:34:02,189 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 51 transitions. Word has length 25 [2021-11-21 00:34:02,189 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:34:02,189 INFO L470 AbstractCegarLoop]: Abstraction has 50 states and 51 transitions. [2021-11-21 00:34:02,189 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 25 states have (on average 1.2) internal successors, (30), 24 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:34:02,190 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 51 transitions. [2021-11-21 00:34:02,191 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2021-11-21 00:34:02,191 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:34:02,191 INFO L514 BasicCegarLoop]: trace histogram [22, 22, 1, 1, 1, 1, 1] [2021-11-21 00:34:02,230 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_942c7569-ce20-4a70-8ae9-3ae6500cbaba/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-21 00:34:02,406 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_942c7569-ce20-4a70-8ae9-3ae6500cbaba/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:34:02,406 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:34:02,407 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:34:02,407 INFO L85 PathProgramCache]: Analyzing trace with hash -787343571, now seen corresponding path program 4 times [2021-11-21 00:34:02,407 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:34:02,407 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1970661800] [2021-11-21 00:34:02,408 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:34:02,408 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:34:02,515 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:34:02,818 INFO L134 CoverageAnalysis]: Checked inductivity of 506 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 253 trivial. 0 not checked. [2021-11-21 00:34:02,818 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:34:02,818 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1970661800] [2021-11-21 00:34:02,819 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1970661800] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:34:02,819 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [107475357] [2021-11-21 00:34:02,819 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-21 00:34:02,819 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:34:02,819 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_942c7569-ce20-4a70-8ae9-3ae6500cbaba/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:34:02,820 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_942c7569-ce20-4a70-8ae9-3ae6500cbaba/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:34:02,821 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_942c7569-ce20-4a70-8ae9-3ae6500cbaba/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-21 00:34:02,915 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:34:02,918 INFO L263 TraceCheckSpWp]: Trace formula consists of 360 conjuncts, 24 conjunts are in the unsatisfiable core [2021-11-21 00:34:02,921 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:34:03,045 INFO L134 CoverageAnalysis]: Checked inductivity of 506 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 253 trivial. 0 not checked. [2021-11-21 00:34:03,045 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:34:03,755 INFO L134 CoverageAnalysis]: Checked inductivity of 506 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 253 trivial. 0 not checked. [2021-11-21 00:34:03,755 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [107475357] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:34:03,755 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1811443273] [2021-11-21 00:34:03,758 INFO L159 IcfgInterpreter]: Started Sifa with 6 locations of interest [2021-11-21 00:34:03,758 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:34:03,759 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:34:03,759 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:34:03,759 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:34:03,773 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:34:03,774 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:34:03,798 INFO L354 Elim1Store]: treesize reduction 37, result has 32.7 percent of original size [2021-11-21 00:34:03,798 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 20 treesize of output 34 [2021-11-21 00:34:03,828 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:34:03,830 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:34:03,864 INFO L354 Elim1Store]: treesize reduction 60, result has 24.1 percent of original size [2021-11-21 00:34:03,865 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 39 treesize of output 53 [2021-11-21 00:34:03,960 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:34:03,961 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:34:03,963 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 5 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 58 treesize of output 51 [2021-11-21 00:34:04,078 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:34:04,079 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:34:04,080 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 00:34:04,080 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 00:34:04,081 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 00:34:04,142 INFO L354 Elim1Store]: treesize reduction 250, result has 15.5 percent of original size [2021-11-21 00:34:04,142 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 2 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 9 case distinctions, treesize of input 280 treesize of output 270 [2021-11-21 00:34:04,942 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 00:34:04,956 INFO L354 Elim1Store]: treesize reduction 18, result has 47.1 percent of original size [2021-11-21 00:34:04,956 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 1 case distinctions, treesize of input 59 treesize of output 45 [2021-11-21 00:34:05,065 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 00:34:05,072 INFO L354 Elim1Store]: treesize reduction 17, result has 29.2 percent of original size [2021-11-21 00:34:05,072 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 19 treesize of output 18 [2021-11-21 00:34:05,153 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 00:34:05,154 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 00:34:05,192 INFO L354 Elim1Store]: treesize reduction 95, result has 34.9 percent of original size [2021-11-21 00:34:05,192 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 6 case distinctions, treesize of input 51 treesize of output 80 [2021-11-21 00:34:05,270 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 00:34:05,277 INFO L354 Elim1Store]: treesize reduction 22, result has 35.3 percent of original size [2021-11-21 00:34:05,278 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 29 treesize of output 28 [2021-11-21 00:34:05,472 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:34:05,602 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:34:05,602 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:34:05,602 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24, 24] total 48 [2021-11-21 00:34:05,602 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2041612058] [2021-11-21 00:34:05,602 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 00:34:05,603 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 49 states [2021-11-21 00:34:05,603 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:34:05,604 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2021-11-21 00:34:05,605 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1185, Invalid=1467, Unknown=0, NotChecked=0, Total=2652 [2021-11-21 00:34:05,606 INFO L87 Difference]: Start difference. First operand 50 states and 51 transitions. Second operand has 49 states, 49 states have (on average 1.1020408163265305) internal successors, (54), 48 states have internal predecessors, (54), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:34:05,864 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:34:05,864 INFO L93 Difference]: Finished difference Result 124 states and 173 transitions. [2021-11-21 00:34:05,865 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2021-11-21 00:34:05,865 INFO L78 Accepts]: Start accepts. Automaton has has 49 states, 49 states have (on average 1.1020408163265305) internal successors, (54), 48 states have internal predecessors, (54), 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 49 [2021-11-21 00:34:05,880 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:34:05,881 INFO L225 Difference]: With dead ends: 124 [2021-11-21 00:34:05,882 INFO L226 Difference]: Without dead ends: 98 [2021-11-21 00:34:05,883 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 169 GetRequests, 119 SyntacticMatches, 0 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 295 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=1185, Invalid=1467, Unknown=0, NotChecked=0, Total=2652 [2021-11-21 00:34:05,884 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 0 mSDsluCounter, 6 mSDsCounter, 0 mSdLazyCounter, 102 mSolverCounterSat, 248 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 8 SdHoareTripleChecker+Invalid, 350 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 248 IncrementalHoareTripleChecker+Valid, 102 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-21 00:34:05,884 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 8 Invalid, 350 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [248 Valid, 102 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-21 00:34:05,885 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 98 states. [2021-11-21 00:34:05,901 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 98 to 98. [2021-11-21 00:34:05,904 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 98 states, 97 states have (on average 1.0206185567010309) internal successors, (99), 97 states have internal predecessors, (99), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:34:05,910 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 98 states to 98 states and 99 transitions. [2021-11-21 00:34:05,911 INFO L78 Accepts]: Start accepts. Automaton has 98 states and 99 transitions. Word has length 49 [2021-11-21 00:34:05,911 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:34:05,911 INFO L470 AbstractCegarLoop]: Abstraction has 98 states and 99 transitions. [2021-11-21 00:34:05,912 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 49 states, 49 states have (on average 1.1020408163265305) internal successors, (54), 48 states have internal predecessors, (54), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:34:05,912 INFO L276 IsEmpty]: Start isEmpty. Operand 98 states and 99 transitions. [2021-11-21 00:34:05,915 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 98 [2021-11-21 00:34:05,917 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:34:05,917 INFO L514 BasicCegarLoop]: trace histogram [46, 46, 1, 1, 1, 1, 1] [2021-11-21 00:34:05,943 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_942c7569-ce20-4a70-8ae9-3ae6500cbaba/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-21 00:34:06,129 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_942c7569-ce20-4a70-8ae9-3ae6500cbaba/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:34:06,130 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:34:06,130 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:34:06,130 INFO L85 PathProgramCache]: Analyzing trace with hash 764126125, now seen corresponding path program 5 times [2021-11-21 00:34:06,130 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:34:06,130 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1178314532] [2021-11-21 00:34:06,130 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:34:06,130 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:34:06,297 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:34:07,256 INFO L134 CoverageAnalysis]: Checked inductivity of 2162 backedges. 0 proven. 1081 refuted. 0 times theorem prover too weak. 1081 trivial. 0 not checked. [2021-11-21 00:34:07,256 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:34:07,256 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1178314532] [2021-11-21 00:34:07,256 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1178314532] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:34:07,257 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [94291379] [2021-11-21 00:34:07,257 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 00:34:07,257 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:34:07,257 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_942c7569-ce20-4a70-8ae9-3ae6500cbaba/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:34:07,261 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_942c7569-ce20-4a70-8ae9-3ae6500cbaba/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:34:07,262 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_942c7569-ce20-4a70-8ae9-3ae6500cbaba/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process