./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/loop-acceleration/array_2-1-simple.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_40ca0b76-edbe-49c0-a738-414261171251/bin/utaipan-TEXQjIfE4P/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40ca0b76-edbe-49c0-a738-414261171251/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_40ca0b76-edbe-49c0-a738-414261171251/bin/utaipan-TEXQjIfE4P/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40ca0b76-edbe-49c0-a738-414261171251/bin/utaipan-TEXQjIfE4P/config/TaipanReach.xml -i ../../sv-benchmarks/c/loop-acceleration/array_2-1-simple.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40ca0b76-edbe-49c0-a738-414261171251/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_40ca0b76-edbe-49c0-a738-414261171251/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 ef2ac183abfa5be888591001d2f7376a659c701d3e7fb64cad1cba56a829d8b3 --- Real Ultimate output --- This is Ultimate 0.2.1-dev-53f42b1 [2021-11-21 01:54:17,012 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-21 01:54:17,022 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-21 01:54:17,054 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-21 01:54:17,055 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-21 01:54:17,056 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-21 01:54:17,058 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-21 01:54:17,061 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-21 01:54:17,063 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-21 01:54:17,064 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-21 01:54:17,066 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-21 01:54:17,067 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-21 01:54:17,068 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-21 01:54:17,069 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-21 01:54:17,071 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-21 01:54:17,072 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-21 01:54:17,073 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-21 01:54:17,075 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-21 01:54:17,077 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-21 01:54:17,080 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-21 01:54:17,082 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-21 01:54:17,083 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-21 01:54:17,085 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-21 01:54:17,092 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-21 01:54:17,096 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-21 01:54:17,098 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-21 01:54:17,098 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-21 01:54:17,099 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-21 01:54:17,100 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-21 01:54:17,101 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-21 01:54:17,101 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-21 01:54:17,102 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-21 01:54:17,103 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-21 01:54:17,104 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-21 01:54:17,106 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-21 01:54:17,106 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-21 01:54:17,107 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-21 01:54:17,107 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-21 01:54:17,108 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-21 01:54:17,109 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-21 01:54:17,110 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-21 01:54:17,111 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40ca0b76-edbe-49c0-a738-414261171251/bin/utaipan-TEXQjIfE4P/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-21 01:54:17,136 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-21 01:54:17,137 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-21 01:54:17,137 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-21 01:54:17,138 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-21 01:54:17,138 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-21 01:54:17,138 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-21 01:54:17,139 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-21 01:54:17,139 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-21 01:54:17,139 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-21 01:54:17,139 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-21 01:54:17,139 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-21 01:54:17,140 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-21 01:54:17,140 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-21 01:54:17,140 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-21 01:54:17,140 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-21 01:54:17,140 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-21 01:54:17,141 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-21 01:54:17,141 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-21 01:54:17,142 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-21 01:54:17,142 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-21 01:54:17,142 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-21 01:54:17,142 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-21 01:54:17,142 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-21 01:54:17,142 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-21 01:54:17,143 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-21 01:54:17,143 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-21 01:54:17,143 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-21 01:54:17,143 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-21 01:54:17,143 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-21 01:54:17,144 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-21 01:54:17,144 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-21 01:54:17,144 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-21 01:54:17,144 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-21 01:54:17,144 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-21 01:54:17,145 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-21 01:54:17,145 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-21 01:54:17,145 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-21 01:54:17,145 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-21 01:54:17,145 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-21 01:54:17,146 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-21 01:54:17,146 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-21 01:54:17,146 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_40ca0b76-edbe-49c0-a738-414261171251/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40ca0b76-edbe-49c0-a738-414261171251/bin/utaipan-TEXQjIfE4P Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> ef2ac183abfa5be888591001d2f7376a659c701d3e7fb64cad1cba56a829d8b3 [2021-11-21 01:54:17,392 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-21 01:54:17,413 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-21 01:54:17,416 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-21 01:54:17,417 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-21 01:54:17,418 INFO L275 PluginConnector]: CDTParser initialized [2021-11-21 01:54:17,419 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40ca0b76-edbe-49c0-a738-414261171251/bin/utaipan-TEXQjIfE4P/../../sv-benchmarks/c/loop-acceleration/array_2-1-simple.i [2021-11-21 01:54:17,520 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40ca0b76-edbe-49c0-a738-414261171251/bin/utaipan-TEXQjIfE4P/data/fca2d3922/ec18bcf340354ee5bf3eebedce3d343c/FLAG83825476b [2021-11-21 01:54:18,049 INFO L306 CDTParser]: Found 1 translation units. [2021-11-21 01:54:18,050 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40ca0b76-edbe-49c0-a738-414261171251/sv-benchmarks/c/loop-acceleration/array_2-1-simple.i [2021-11-21 01:54:18,056 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40ca0b76-edbe-49c0-a738-414261171251/bin/utaipan-TEXQjIfE4P/data/fca2d3922/ec18bcf340354ee5bf3eebedce3d343c/FLAG83825476b [2021-11-21 01:54:18,399 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40ca0b76-edbe-49c0-a738-414261171251/bin/utaipan-TEXQjIfE4P/data/fca2d3922/ec18bcf340354ee5bf3eebedce3d343c [2021-11-21 01:54:18,402 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-21 01:54:18,403 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-21 01:54:18,418 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-21 01:54:18,418 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-21 01:54:18,426 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-21 01:54:18,427 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.11 01:54:18" (1/1) ... [2021-11-21 01:54:18,429 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@37948015 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:54:18, skipping insertion in model container [2021-11-21 01:54:18,432 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.11 01:54:18" (1/1) ... [2021-11-21 01:54:18,439 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-21 01:54:18,455 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-21 01:54:18,609 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_40ca0b76-edbe-49c0-a738-414261171251/sv-benchmarks/c/loop-acceleration/array_2-1-simple.i[809,822] [2021-11-21 01:54:18,625 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-21 01:54:18,634 INFO L203 MainTranslator]: Completed pre-run [2021-11-21 01:54:18,646 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_40ca0b76-edbe-49c0-a738-414261171251/sv-benchmarks/c/loop-acceleration/array_2-1-simple.i[809,822] [2021-11-21 01:54:18,652 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-21 01:54:18,666 INFO L208 MainTranslator]: Completed translation [2021-11-21 01:54:18,667 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:54:18 WrapperNode [2021-11-21 01:54:18,667 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-21 01:54:18,668 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-21 01:54:18,669 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-21 01:54:18,669 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-21 01:54:18,676 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:54:18" (1/1) ... [2021-11-21 01:54:18,684 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:54:18" (1/1) ... [2021-11-21 01:54:18,702 INFO L137 Inliner]: procedures = 16, calls = 17, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 44 [2021-11-21 01:54:18,703 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-21 01:54:18,704 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-21 01:54:18,704 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-21 01:54:18,704 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-21 01:54:18,712 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:54:18" (1/1) ... [2021-11-21 01:54:18,712 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:54:18" (1/1) ... [2021-11-21 01:54:18,714 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:54:18" (1/1) ... [2021-11-21 01:54:18,715 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:54:18" (1/1) ... [2021-11-21 01:54:18,720 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:54:18" (1/1) ... [2021-11-21 01:54:18,732 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:54:18" (1/1) ... [2021-11-21 01:54:18,735 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:54:18" (1/1) ... [2021-11-21 01:54:18,737 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-21 01:54:18,738 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-21 01:54:18,738 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-21 01:54:18,738 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-21 01:54:18,745 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:54:18" (1/1) ... [2021-11-21 01:54:18,752 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-21 01:54:18,765 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40ca0b76-edbe-49c0-a738-414261171251/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:54:18,783 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40ca0b76-edbe-49c0-a738-414261171251/bin/utaipan-TEXQjIfE4P/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-21 01:54:18,816 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40ca0b76-edbe-49c0-a738-414261171251/bin/utaipan-TEXQjIfE4P/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-21 01:54:18,835 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-21 01:54:18,835 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-21 01:54:18,835 INFO L130 BoogieDeclarations]: Found specification of procedure write~unchecked~int [2021-11-21 01:54:18,835 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-11-21 01:54:18,835 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-11-21 01:54:18,835 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-21 01:54:18,836 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-21 01:54:18,836 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-11-21 01:54:18,836 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-11-21 01:54:18,906 INFO L236 CfgBuilder]: Building ICFG [2021-11-21 01:54:18,907 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-21 01:54:18,991 INFO L277 CfgBuilder]: Performing block encoding [2021-11-21 01:54:19,013 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-21 01:54:19,013 INFO L301 CfgBuilder]: Removed 1 assume(true) statements. [2021-11-21 01:54:19,016 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.11 01:54:19 BoogieIcfgContainer [2021-11-21 01:54:19,016 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-21 01:54:19,018 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-21 01:54:19,018 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-21 01:54:19,022 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-21 01:54:19,023 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.11 01:54:18" (1/3) ... [2021-11-21 01:54:19,023 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5e185fc and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.11 01:54:19, skipping insertion in model container [2021-11-21 01:54:19,024 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:54:18" (2/3) ... [2021-11-21 01:54:19,024 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5e185fc and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.11 01:54:19, skipping insertion in model container [2021-11-21 01:54:19,024 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.11 01:54:19" (3/3) ... [2021-11-21 01:54:19,026 INFO L111 eAbstractionObserver]: Analyzing ICFG array_2-1-simple.i [2021-11-21 01:54:19,031 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-21 01:54:19,031 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-21 01:54:19,073 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-21 01:54:19,081 INFO L339 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mLoopAccelerationTechnique=FAST_UPR [2021-11-21 01:54:19,081 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-21 01:54:19,095 INFO L276 IsEmpty]: Start isEmpty. Operand has 7 states, 5 states have (on average 1.6) internal successors, (8), 6 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:54:19,099 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2021-11-21 01:54:19,100 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:54:19,100 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1] [2021-11-21 01:54:19,101 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:54:19,107 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:54:19,107 INFO L85 PathProgramCache]: Analyzing trace with hash 1941830, now seen corresponding path program 1 times [2021-11-21 01:54:19,116 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:54:19,117 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1481691356] [2021-11-21 01:54:19,117 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:54:19,118 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:54:19,217 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:54:19,307 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:54:19,307 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:54:19,308 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1481691356] [2021-11-21 01:54:19,322 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1481691356] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 01:54:19,322 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 01:54:19,323 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-21 01:54:19,325 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2016330035] [2021-11-21 01:54:19,326 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:54:19,330 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-21 01:54:19,331 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:54:19,358 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-21 01:54:19,359 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-21 01:54:19,361 INFO L87 Difference]: Start difference. First operand has 7 states, 5 states have (on average 1.6) internal successors, (8), 6 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 3 states, 3 states have (on average 1.3333333333333333) internal successors, (4), 2 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:54:19,390 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:54:19,391 INFO L93 Difference]: Finished difference Result 13 states and 15 transitions. [2021-11-21 01:54:19,392 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-21 01:54:19,394 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 1.3333333333333333) internal successors, (4), 2 states have internal predecessors, (4), 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 4 [2021-11-21 01:54:19,394 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:54:19,401 INFO L225 Difference]: With dead ends: 13 [2021-11-21 01:54:19,402 INFO L226 Difference]: Without dead ends: 6 [2021-11-21 01:54:19,405 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-21 01:54:19,409 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 0 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 7 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 6 SdHoareTripleChecker+Invalid, 7 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 7 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-21 01:54:19,410 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 6 Invalid, 7 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 7 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-21 01:54:19,428 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6 states. [2021-11-21 01:54:19,439 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6 to 6. [2021-11-21 01:54:19,441 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 6 states, 5 states have (on average 1.2) internal successors, (6), 5 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:54:19,441 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6 states to 6 states and 6 transitions. [2021-11-21 01:54:19,443 INFO L78 Accepts]: Start accepts. Automaton has 6 states and 6 transitions. Word has length 4 [2021-11-21 01:54:19,443 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:54:19,443 INFO L470 AbstractCegarLoop]: Abstraction has 6 states and 6 transitions. [2021-11-21 01:54:19,443 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 1.3333333333333333) internal successors, (4), 2 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:54:19,444 INFO L276 IsEmpty]: Start isEmpty. Operand 6 states and 6 transitions. [2021-11-21 01:54:19,444 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2021-11-21 01:54:19,444 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:54:19,445 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1] [2021-11-21 01:54:19,445 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-21 01:54:19,445 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:54:19,446 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:54:19,447 INFO L85 PathProgramCache]: Analyzing trace with hash 60064071, now seen corresponding path program 1 times [2021-11-21 01:54:19,447 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:54:19,447 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [840106635] [2021-11-21 01:54:19,448 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:54:19,448 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:54:19,465 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:54:19,495 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:54:19,496 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:54:19,496 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [840106635] [2021-11-21 01:54:19,496 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [840106635] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:54:19,497 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [14410531] [2021-11-21 01:54:19,497 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:54:19,497 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:54:19,497 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40ca0b76-edbe-49c0-a738-414261171251/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:54:19,499 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40ca0b76-edbe-49c0-a738-414261171251/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:54:19,531 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40ca0b76-edbe-49c0-a738-414261171251/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-21 01:54:19,555 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:54:19,557 INFO L263 TraceCheckSpWp]: Trace formula consists of 56 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-21 01:54:19,561 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:54:19,611 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:54:19,611 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:54:19,644 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:54:19,646 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [14410531] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:54:19,647 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1757920408] [2021-11-21 01:54:19,676 INFO L159 IcfgInterpreter]: Started Sifa with 5 locations of interest [2021-11-21 01:54:19,676 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:54:19,681 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:54:19,690 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:54:19,693 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:54:19,815 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:54:19,817 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:54:19,858 INFO L354 Elim1Store]: treesize reduction 37, result has 32.7 percent of original size [2021-11-21 01:54:19,859 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 01:54:19,916 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:54:19,919 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:54:19,924 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:54:19,926 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:54:19,981 INFO L354 Elim1Store]: treesize reduction 60, result has 24.1 percent of original size [2021-11-21 01:54:19,982 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 01:54:20,024 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:54:20,043 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:54:20,044 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:54:20,047 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 5 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 32 treesize of output 34 [2021-11-21 01:54:20,215 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:54:20,216 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:54:20,223 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 3 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 51 treesize of output 48 [2021-11-21 01:54:20,464 INFO L354 Elim1Store]: treesize reduction 68, result has 13.9 percent of original size [2021-11-21 01:54:20,466 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 5 case distinctions, treesize of input 257 treesize of output 246 [2021-11-21 01:54:21,260 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:54:21,272 INFO L354 Elim1Store]: treesize reduction 22, result has 35.3 percent of original size [2021-11-21 01:54:21,273 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 29 treesize of output 28 [2021-11-21 01:54:21,529 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:54:21,662 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:54:21,663 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:54:21,663 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3, 3] total 6 [2021-11-21 01:54:21,664 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1110444449] [2021-11-21 01:54:21,664 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:54:21,664 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-21 01:54:21,664 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:54:21,665 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-21 01:54:21,665 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=60, Unknown=0, NotChecked=0, Total=90 [2021-11-21 01:54:21,666 INFO L87 Difference]: Start difference. First operand 6 states and 6 transitions. Second operand has 7 states, 7 states have (on average 1.4285714285714286) internal successors, (10), 6 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:54:21,689 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:54:21,689 INFO L93 Difference]: Finished difference Result 12 states and 14 transitions. [2021-11-21 01:54:21,690 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-21 01:54:21,690 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 1.4285714285714286) internal successors, (10), 6 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) Word has length 5 [2021-11-21 01:54:21,690 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:54:21,691 INFO L225 Difference]: With dead ends: 12 [2021-11-21 01:54:21,691 INFO L226 Difference]: Without dead ends: 9 [2021-11-21 01:54:21,692 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=30, Invalid=60, Unknown=0, NotChecked=0, Total=90 [2021-11-21 01:54:21,699 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 0 mSDsluCounter, 6 mSDsCounter, 0 mSdLazyCounter, 11 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 8 SdHoareTripleChecker+Invalid, 14 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 11 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-21 01:54:21,700 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 8 Invalid, 14 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 11 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-21 01:54:21,703 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9 states. [2021-11-21 01:54:21,705 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9 to 9. [2021-11-21 01:54:21,705 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 9 states, 8 states have (on average 1.125) internal successors, (9), 8 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:54:21,706 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9 states to 9 states and 9 transitions. [2021-11-21 01:54:21,706 INFO L78 Accepts]: Start accepts. Automaton has 9 states and 9 transitions. Word has length 5 [2021-11-21 01:54:21,707 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:54:21,707 INFO L470 AbstractCegarLoop]: Abstraction has 9 states and 9 transitions. [2021-11-21 01:54:21,707 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 1.4285714285714286) internal successors, (10), 6 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:54:21,708 INFO L276 IsEmpty]: Start isEmpty. Operand 9 states and 9 transitions. [2021-11-21 01:54:21,708 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2021-11-21 01:54:21,709 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:54:21,709 INFO L514 BasicCegarLoop]: trace histogram [4, 1, 1, 1, 1] [2021-11-21 01:54:21,748 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40ca0b76-edbe-49c0-a738-414261171251/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-21 01:54:21,913 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40ca0b76-edbe-49c0-a738-414261171251/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:54:21,914 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:54:21,914 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:54:21,915 INFO L85 PathProgramCache]: Analyzing trace with hash -1764353658, now seen corresponding path program 2 times [2021-11-21 01:54:21,915 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:54:21,915 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [278297407] [2021-11-21 01:54:21,915 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:54:21,915 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:54:21,946 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:54:21,999 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:54:21,999 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:54:21,999 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [278297407] [2021-11-21 01:54:22,000 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [278297407] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:54:22,000 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2023263543] [2021-11-21 01:54:22,000 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 01:54:22,000 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:54:22,001 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40ca0b76-edbe-49c0-a738-414261171251/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:54:22,001 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40ca0b76-edbe-49c0-a738-414261171251/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:54:22,018 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40ca0b76-edbe-49c0-a738-414261171251/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-21 01:54:22,045 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-11-21 01:54:22,045 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:54:22,046 INFO L263 TraceCheckSpWp]: Trace formula consists of 74 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-21 01:54:22,047 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:54:22,074 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:54:22,074 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:54:22,137 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:54:22,137 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2023263543] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:54:22,138 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1972161424] [2021-11-21 01:54:22,140 INFO L159 IcfgInterpreter]: Started Sifa with 5 locations of interest [2021-11-21 01:54:22,140 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:54:22,141 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:54:22,141 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:54:22,141 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:54:22,179 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:54:22,180 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:54:22,181 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:54:22,191 INFO L354 Elim1Store]: treesize reduction 19, result has 32.1 percent of original size [2021-11-21 01:54:22,191 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 32 treesize of output 34 [2021-11-21 01:54:22,210 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:54:22,212 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:54:22,242 INFO L354 Elim1Store]: treesize reduction 37, result has 32.7 percent of original size [2021-11-21 01:54:22,242 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 01:54:22,281 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:54:22,283 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:54:22,285 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:54:22,286 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:54:22,326 INFO L354 Elim1Store]: treesize reduction 60, result has 24.1 percent of original size [2021-11-21 01:54:22,326 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 01:54:22,386 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:54:22,387 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:54:22,389 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 51 treesize of output 48 [2021-11-21 01:54:22,599 INFO L354 Elim1Store]: treesize reduction 68, result has 13.9 percent of original size [2021-11-21 01:54:22,602 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 5 case distinctions, treesize of input 257 treesize of output 246 [2021-11-21 01:54:23,210 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:54:23,221 INFO L354 Elim1Store]: treesize reduction 22, result has 35.3 percent of original size [2021-11-21 01:54:23,222 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 29 treesize of output 28 [2021-11-21 01:54:23,440 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:54:23,608 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:54:23,608 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:54:23,609 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 12 [2021-11-21 01:54:23,609 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [230016710] [2021-11-21 01:54:23,609 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:54:23,610 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2021-11-21 01:54:23,610 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:54:23,610 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-11-21 01:54:23,611 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=87, Invalid=153, Unknown=0, NotChecked=0, Total=240 [2021-11-21 01:54:23,611 INFO L87 Difference]: Start difference. First operand 9 states and 9 transitions. Second operand has 13 states, 13 states have (on average 1.2307692307692308) internal successors, (16), 12 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:54:23,666 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:54:23,666 INFO L93 Difference]: Finished difference Result 18 states and 23 transitions. [2021-11-21 01:54:23,667 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-21 01:54:23,667 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 1.2307692307692308) internal successors, (16), 12 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 8 [2021-11-21 01:54:23,667 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:54:23,668 INFO L225 Difference]: With dead ends: 18 [2021-11-21 01:54:23,668 INFO L226 Difference]: Without dead ends: 15 [2021-11-21 01:54:23,669 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 14 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 01:54:23,670 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 0 mSDsluCounter, 6 mSDsCounter, 0 mSdLazyCounter, 16 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 8 SdHoareTripleChecker+Invalid, 22 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 16 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-21 01:54:23,670 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 8 Invalid, 22 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 16 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-21 01:54:23,671 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2021-11-21 01:54:23,673 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2021-11-21 01:54:23,674 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 15 states, 14 states have (on average 1.0714285714285714) internal successors, (15), 14 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:54:23,674 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 15 transitions. [2021-11-21 01:54:23,674 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 15 transitions. Word has length 8 [2021-11-21 01:54:23,674 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:54:23,675 INFO L470 AbstractCegarLoop]: Abstraction has 15 states and 15 transitions. [2021-11-21 01:54:23,675 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 1.2307692307692308) internal successors, (16), 12 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:54:23,675 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 15 transitions. [2021-11-21 01:54:23,676 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2021-11-21 01:54:23,676 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:54:23,676 INFO L514 BasicCegarLoop]: trace histogram [10, 1, 1, 1, 1] [2021-11-21 01:54:23,735 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40ca0b76-edbe-49c0-a738-414261171251/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-21 01:54:23,876 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40ca0b76-edbe-49c0-a738-414261171251/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:54:23,877 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:54:23,877 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:54:23,877 INFO L85 PathProgramCache]: Analyzing trace with hash 193090022, now seen corresponding path program 3 times [2021-11-21 01:54:23,878 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:54:23,878 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [939835428] [2021-11-21 01:54:23,878 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:54:23,878 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:54:23,909 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:54:24,045 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:54:24,046 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:54:24,046 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [939835428] [2021-11-21 01:54:24,046 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [939835428] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:54:24,046 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1610510692] [2021-11-21 01:54:24,047 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-21 01:54:24,047 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:54:24,047 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40ca0b76-edbe-49c0-a738-414261171251/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:54:24,048 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40ca0b76-edbe-49c0-a738-414261171251/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:54:24,071 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40ca0b76-edbe-49c0-a738-414261171251/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-21 01:54:24,114 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-21 01:54:24,114 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:54:24,116 INFO L263 TraceCheckSpWp]: Trace formula consists of 110 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-21 01:54:24,118 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:54:24,161 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:54:24,161 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:54:24,396 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:54:24,396 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1610510692] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:54:24,397 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1365697742] [2021-11-21 01:54:24,399 INFO L159 IcfgInterpreter]: Started Sifa with 5 locations of interest [2021-11-21 01:54:24,399 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:54:24,399 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:54:24,399 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:54:24,399 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:54:24,418 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:54:24,419 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:54:24,461 INFO L354 Elim1Store]: treesize reduction 37, result has 32.7 percent of original size [2021-11-21 01:54:24,461 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 01:54:24,497 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:54:24,498 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:54:24,499 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:54:24,509 INFO L354 Elim1Store]: treesize reduction 19, result has 32.1 percent of original size [2021-11-21 01:54:24,509 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 32 treesize of output 34 [2021-11-21 01:54:24,539 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:54:24,541 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:54:24,543 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:54:24,544 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:54:24,578 INFO L354 Elim1Store]: treesize reduction 60, result has 24.1 percent of original size [2021-11-21 01:54:24,578 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 01:54:24,701 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:54:24,702 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:54:24,704 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 3 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 51 treesize of output 48 [2021-11-21 01:54:24,821 INFO L354 Elim1Store]: treesize reduction 68, result has 13.9 percent of original size [2021-11-21 01:54:24,821 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 5 case distinctions, treesize of input 261 treesize of output 248 [2021-11-21 01:54:25,463 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:54:25,475 INFO L354 Elim1Store]: treesize reduction 22, result has 35.3 percent of original size [2021-11-21 01:54:25,476 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 29 treesize of output 28 [2021-11-21 01:54:25,681 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:54:25,811 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:54:25,812 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:54:25,812 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12] total 24 [2021-11-21 01:54:25,812 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1106928923] [2021-11-21 01:54:25,812 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:54:25,812 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2021-11-21 01:54:25,813 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:54:25,813 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-11-21 01:54:25,814 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=309, Invalid=447, Unknown=0, NotChecked=0, Total=756 [2021-11-21 01:54:25,815 INFO L87 Difference]: Start difference. First operand 15 states and 15 transitions. Second operand has 25 states, 25 states have (on average 1.12) internal successors, (28), 24 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:54:25,854 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:54:25,854 INFO L93 Difference]: Finished difference Result 30 states and 41 transitions. [2021-11-21 01:54:25,854 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-11-21 01:54:25,855 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 1.12) internal successors, (28), 24 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 14 [2021-11-21 01:54:25,855 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:54:25,856 INFO L225 Difference]: With dead ends: 30 [2021-11-21 01:54:25,856 INFO L226 Difference]: Without dead ends: 27 [2021-11-21 01:54:25,857 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 26 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 139 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=309, Invalid=447, Unknown=0, NotChecked=0, Total=756 [2021-11-21 01:54:25,858 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 0 mSDsluCounter, 2 mSDsCounter, 0 mSdLazyCounter, 27 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 4 SdHoareTripleChecker+Invalid, 41 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 27 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-21 01:54:25,859 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 4 Invalid, 41 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 27 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-21 01:54:25,859 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2021-11-21 01:54:25,863 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2021-11-21 01:54:25,864 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 26 states have (on average 1.0384615384615385) internal successors, (27), 26 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 01:54:25,864 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 27 transitions. [2021-11-21 01:54:25,865 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 27 transitions. Word has length 14 [2021-11-21 01:54:25,865 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:54:25,865 INFO L470 AbstractCegarLoop]: Abstraction has 27 states and 27 transitions. [2021-11-21 01:54:25,865 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 25 states have (on average 1.12) internal successors, (28), 24 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:54:25,865 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 27 transitions. [2021-11-21 01:54:25,866 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-11-21 01:54:25,866 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:54:25,866 INFO L514 BasicCegarLoop]: trace histogram [22, 1, 1, 1, 1] [2021-11-21 01:54:25,887 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40ca0b76-edbe-49c0-a738-414261171251/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-21 01:54:26,069 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40ca0b76-edbe-49c0-a738-414261171251/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:54:26,070 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:54:26,070 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:54:26,070 INFO L85 PathProgramCache]: Analyzing trace with hash 1874160294, now seen corresponding path program 4 times [2021-11-21 01:54:26,070 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:54:26,070 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1523018647] [2021-11-21 01:54:26,070 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:54:26,071 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:54:26,122 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:54:26,452 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:54:26,453 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:54:26,453 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1523018647] [2021-11-21 01:54:26,453 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1523018647] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:54:26,453 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [107580125] [2021-11-21 01:54:26,453 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-21 01:54:26,454 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:54:26,454 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40ca0b76-edbe-49c0-a738-414261171251/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:54:26,454 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40ca0b76-edbe-49c0-a738-414261171251/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:54:26,458 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40ca0b76-edbe-49c0-a738-414261171251/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-21 01:54:26,509 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:54:26,510 INFO L263 TraceCheckSpWp]: Trace formula consists of 182 conjuncts, 24 conjunts are in the unsatisfiable core [2021-11-21 01:54:26,512 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:54:26,621 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:54:26,621 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:54:27,361 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:54:27,362 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [107580125] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:54:27,362 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1987769830] [2021-11-21 01:54:27,364 INFO L159 IcfgInterpreter]: Started Sifa with 5 locations of interest [2021-11-21 01:54:27,365 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:54:27,365 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:54:27,365 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:54:27,365 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:54:27,397 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:54:27,398 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:54:27,422 INFO L354 Elim1Store]: treesize reduction 37, result has 32.7 percent of original size [2021-11-21 01:54:27,423 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 01:54:27,450 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:54:27,451 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:54:27,453 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:54:27,461 INFO L354 Elim1Store]: treesize reduction 19, result has 32.1 percent of original size [2021-11-21 01:54:27,461 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 32 treesize of output 34 [2021-11-21 01:54:27,481 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:54:27,483 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:54:27,513 INFO L354 Elim1Store]: treesize reduction 60, result has 24.1 percent of original size [2021-11-21 01:54:27,514 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 01:54:27,581 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:54:27,582 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:54:27,584 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 51 treesize of output 48 [2021-11-21 01:54:27,730 INFO L354 Elim1Store]: treesize reduction 68, result has 13.9 percent of original size [2021-11-21 01:54:27,731 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 5 case distinctions, treesize of input 261 treesize of output 248 [2021-11-21 01:54:28,281 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:54:28,291 INFO L354 Elim1Store]: treesize reduction 22, result has 35.3 percent of original size [2021-11-21 01:54:28,291 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 29 treesize of output 28 [2021-11-21 01:54:28,502 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:54:28,663 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:54:28,663 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:54:28,664 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24, 24] total 48 [2021-11-21 01:54:28,664 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [476227265] [2021-11-21 01:54:28,664 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:54:28,664 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 49 states [2021-11-21 01:54:28,665 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:54:28,666 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2021-11-21 01:54:28,667 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1185, Invalid=1467, Unknown=0, NotChecked=0, Total=2652 [2021-11-21 01:54:28,668 INFO L87 Difference]: Start difference. First operand 27 states and 27 transitions. Second operand has 49 states, 49 states have (on average 1.0612244897959184) internal successors, (52), 48 states have internal predecessors, (52), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:54:28,763 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:54:28,763 INFO L93 Difference]: Finished difference Result 54 states and 77 transitions. [2021-11-21 01:54:28,763 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2021-11-21 01:54:28,764 INFO L78 Accepts]: Start accepts. Automaton has has 49 states, 49 states have (on average 1.0612244897959184) internal successors, (52), 48 states have internal predecessors, (52), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 26 [2021-11-21 01:54:28,764 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:54:28,767 INFO L225 Difference]: With dead ends: 54 [2021-11-21 01:54:28,767 INFO L226 Difference]: Without dead ends: 51 [2021-11-21 01:54:28,769 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 100 GetRequests, 50 SyntacticMatches, 0 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 295 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=1185, Invalid=1467, Unknown=0, NotChecked=0, Total=2652 [2021-11-21 01:54:28,772 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 0 mSDsluCounter, 8 mSDsCounter, 0 mSdLazyCounter, 54 mSolverCounterSat, 28 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 10 SdHoareTripleChecker+Invalid, 82 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 28 IncrementalHoareTripleChecker+Valid, 54 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 01:54:28,773 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 10 Invalid, 82 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [28 Valid, 54 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 01:54:28,775 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2021-11-21 01:54:28,788 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 51. [2021-11-21 01:54:28,788 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 51 states, 50 states have (on average 1.02) internal successors, (51), 50 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 01:54:28,792 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 51 transitions. [2021-11-21 01:54:28,793 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 51 transitions. Word has length 26 [2021-11-21 01:54:28,793 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:54:28,793 INFO L470 AbstractCegarLoop]: Abstraction has 51 states and 51 transitions. [2021-11-21 01:54:28,795 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 49 states, 49 states have (on average 1.0612244897959184) internal successors, (52), 48 states have internal predecessors, (52), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:54:28,795 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 51 transitions. [2021-11-21 01:54:28,801 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2021-11-21 01:54:28,802 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:54:28,802 INFO L514 BasicCegarLoop]: trace histogram [46, 1, 1, 1, 1] [2021-11-21 01:54:28,845 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40ca0b76-edbe-49c0-a738-414261171251/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-21 01:54:29,017 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40ca0b76-edbe-49c0-a738-414261171251/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:54:29,017 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:54:29,017 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:54:29,017 INFO L85 PathProgramCache]: Analyzing trace with hash -1326564314, now seen corresponding path program 5 times [2021-11-21 01:54:29,018 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:54:29,018 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1597513254] [2021-11-21 01:54:29,018 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:54:29,018 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:54:29,086 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:54:30,079 INFO L134 CoverageAnalysis]: Checked inductivity of 1081 backedges. 0 proven. 1081 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:54:30,079 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:54:30,079 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1597513254] [2021-11-21 01:54:30,080 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1597513254] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:54:30,080 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1536140741] [2021-11-21 01:54:30,080 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 01:54:30,080 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:54:30,080 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40ca0b76-edbe-49c0-a738-414261171251/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:54:30,087 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40ca0b76-edbe-49c0-a738-414261171251/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:54:30,088 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40ca0b76-edbe-49c0-a738-414261171251/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-21 01:54:31,376 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 24 check-sat command(s) [2021-11-21 01:54:31,377 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:54:31,384 INFO L263 TraceCheckSpWp]: Trace formula consists of 326 conjuncts, 48 conjunts are in the unsatisfiable core [2021-11-21 01:54:31,387 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:54:31,601 INFO L134 CoverageAnalysis]: Checked inductivity of 1081 backedges. 0 proven. 1081 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:54:31,601 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:54:34,374 INFO L134 CoverageAnalysis]: Checked inductivity of 1081 backedges. 0 proven. 1081 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:54:34,374 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1536140741] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:54:34,374 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [447088371] [2021-11-21 01:54:34,376 INFO L159 IcfgInterpreter]: Started Sifa with 5 locations of interest [2021-11-21 01:54:34,376 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:54:34,376 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:54:34,377 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:54:34,377 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:54:34,405 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:54:34,406 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:54:34,430 INFO L354 Elim1Store]: treesize reduction 37, result has 32.7 percent of original size [2021-11-21 01:54:34,430 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 01:54:34,462 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:54:34,464 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:54:34,466 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:54:34,467 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:54:34,496 INFO L354 Elim1Store]: treesize reduction 60, result has 24.1 percent of original size [2021-11-21 01:54:34,497 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 01:54:34,520 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:54:34,522 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:54:34,522 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:54:34,523 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 5 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 32 treesize of output 34 [2021-11-21 01:54:34,618 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:54:34,619 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:54:34,620 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 3 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 51 treesize of output 48 [2021-11-21 01:54:34,733 INFO L354 Elim1Store]: treesize reduction 68, result has 13.9 percent of original size [2021-11-21 01:54:34,733 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 5 case distinctions, treesize of input 257 treesize of output 246 [2021-11-21 01:54:35,210 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:54:35,217 INFO L354 Elim1Store]: treesize reduction 22, result has 35.3 percent of original size [2021-11-21 01:54:35,217 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 29 treesize of output 28 [2021-11-21 01:54:35,383 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:54:35,558 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:54:35,558 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:54:35,558 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [48, 48, 48] total 96 [2021-11-21 01:54:35,559 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1278297753] [2021-11-21 01:54:35,559 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:54:35,559 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 97 states [2021-11-21 01:54:35,560 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:54:35,561 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 97 interpolants. [2021-11-21 01:54:35,566 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=4665, Invalid=5235, Unknown=0, NotChecked=0, Total=9900 [2021-11-21 01:54:35,566 INFO L87 Difference]: Start difference. First operand 51 states and 51 transitions. Second operand has 97 states, 97 states have (on average 1.0309278350515463) internal successors, (100), 96 states have internal predecessors, (100), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:54:35,748 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:54:35,749 INFO L93 Difference]: Finished difference Result 102 states and 149 transitions. [2021-11-21 01:54:35,749 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 96 states. [2021-11-21 01:54:35,750 INFO L78 Accepts]: Start accepts. Automaton has has 97 states, 97 states have (on average 1.0309278350515463) internal successors, (100), 96 states have internal predecessors, (100), 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 50 [2021-11-21 01:54:35,750 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:54:35,751 INFO L225 Difference]: With dead ends: 102 [2021-11-21 01:54:35,751 INFO L226 Difference]: Without dead ends: 99 [2021-11-21 01:54:35,755 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 196 GetRequests, 98 SyntacticMatches, 0 SemanticMatches, 98 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 607 ImplicationChecksByTransitivity, 3.6s TimeCoverageRelationStatistics Valid=4665, Invalid=5235, Unknown=0, NotChecked=0, Total=9900 [2021-11-21 01:54:35,756 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 0 mSDsluCounter, 6 mSDsCounter, 0 mSdLazyCounter, 100 mSolverCounterSat, 55 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 8 SdHoareTripleChecker+Invalid, 155 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 55 IncrementalHoareTripleChecker+Valid, 100 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 01:54:35,757 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 8 Invalid, 155 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [55 Valid, 100 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 01:54:35,757 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 99 states. [2021-11-21 01:54:35,767 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 99 to 99. [2021-11-21 01:54:35,767 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 99 states, 98 states have (on average 1.010204081632653) internal successors, (99), 98 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 01:54:35,769 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99 states to 99 states and 99 transitions. [2021-11-21 01:54:35,769 INFO L78 Accepts]: Start accepts. Automaton has 99 states and 99 transitions. Word has length 50 [2021-11-21 01:54:35,770 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:54:35,770 INFO L470 AbstractCegarLoop]: Abstraction has 99 states and 99 transitions. [2021-11-21 01:54:35,770 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 97 states, 97 states have (on average 1.0309278350515463) internal successors, (100), 96 states have internal predecessors, (100), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:54:35,770 INFO L276 IsEmpty]: Start isEmpty. Operand 99 states and 99 transitions. [2021-11-21 01:54:35,774 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 99 [2021-11-21 01:54:35,774 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:54:35,774 INFO L514 BasicCegarLoop]: trace histogram [94, 1, 1, 1, 1] [2021-11-21 01:54:35,814 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40ca0b76-edbe-49c0-a738-414261171251/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-21 01:54:36,001 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40ca0b76-edbe-49c0-a738-414261171251/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2021-11-21 01:54:36,002 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:54:36,002 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:54:36,002 INFO L85 PathProgramCache]: Analyzing trace with hash 1575640870, now seen corresponding path program 6 times [2021-11-21 01:54:36,002 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:54:36,002 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [602052634] [2021-11-21 01:54:36,003 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:54:36,003 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:54:36,130 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:54:39,456 INFO L134 CoverageAnalysis]: Checked inductivity of 4465 backedges. 0 proven. 4465 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:54:39,456 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:54:39,456 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [602052634] [2021-11-21 01:54:39,456 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [602052634] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:54:39,456 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1490622255] [2021-11-21 01:54:39,456 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-21 01:54:39,457 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:54:39,457 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40ca0b76-edbe-49c0-a738-414261171251/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:54:39,457 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40ca0b76-edbe-49c0-a738-414261171251/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:54:39,458 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40ca0b76-edbe-49c0-a738-414261171251/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-21 01:54:39,602 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-21 01:54:39,602 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:54:39,606 INFO L263 TraceCheckSpWp]: Trace formula consists of 614 conjuncts, 96 conjunts are in the unsatisfiable core [2021-11-21 01:54:39,614 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:54:39,906 INFO L134 CoverageAnalysis]: Checked inductivity of 4465 backedges. 0 proven. 4465 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:54:39,906 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:54:49,047 INFO L134 CoverageAnalysis]: Checked inductivity of 4465 backedges. 0 proven. 4465 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:54:49,047 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1490622255] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:54:49,047 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2059379225] [2021-11-21 01:54:49,048 INFO L159 IcfgInterpreter]: Started Sifa with 5 locations of interest [2021-11-21 01:54:49,048 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:54:49,049 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:54:49,049 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:54:49,049 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:54:49,063 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:54:49,064 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:54:49,105 INFO L354 Elim1Store]: treesize reduction 60, result has 24.1 percent of original size [2021-11-21 01:54:49,106 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 01:54:49,136 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:54:49,137 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:54:49,138 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 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 20 treesize of output 27 [2021-11-21 01:54:49,169 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:54:49,170 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:54:49,170 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:54:49,171 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 5 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 32 treesize of output 34 [2021-11-21 01:54:49,206 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:54:49,207 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:54:49,208 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 61 treesize of output 58 [2021-11-21 01:54:49,348 INFO L354 Elim1Store]: treesize reduction 68, result has 13.9 percent of original size [2021-11-21 01:54:49,349 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 5 case distinctions, treesize of input 274 treesize of output 261 [2021-11-21 01:54:49,825 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:54:49,832 INFO L354 Elim1Store]: treesize reduction 22, result has 35.3 percent of original size [2021-11-21 01:54:49,833 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 29 treesize of output 28 [2021-11-21 01:54:49,991 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:54:50,263 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:54:50,264 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:54:50,264 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [96, 96, 96] total 192 [2021-11-21 01:54:50,264 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1452768391] [2021-11-21 01:54:50,265 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:54:50,265 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 193 states [2021-11-21 01:54:50,266 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:54:50,270 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 193 interpolants. [2021-11-21 01:54:50,282 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=18537, Invalid=19683, Unknown=0, NotChecked=0, Total=38220 [2021-11-21 01:54:50,282 INFO L87 Difference]: Start difference. First operand 99 states and 99 transitions. Second operand has 193 states, 193 states have (on average 1.0155440414507773) internal successors, (196), 192 states have internal predecessors, (196), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:54:50,737 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:54:50,737 INFO L93 Difference]: Finished difference Result 198 states and 293 transitions. [2021-11-21 01:54:50,738 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 192 states. [2021-11-21 01:54:50,738 INFO L78 Accepts]: Start accepts. Automaton has has 193 states, 193 states have (on average 1.0155440414507773) internal successors, (196), 192 states have internal predecessors, (196), 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 98 [2021-11-21 01:54:50,739 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:54:50,741 INFO L225 Difference]: With dead ends: 198 [2021-11-21 01:54:50,741 INFO L226 Difference]: Without dead ends: 195 [2021-11-21 01:54:50,745 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 388 GetRequests, 194 SyntacticMatches, 0 SemanticMatches, 194 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1231 ImplicationChecksByTransitivity, 12.0s TimeCoverageRelationStatistics Valid=18537, Invalid=19683, Unknown=0, NotChecked=0, Total=38220 [2021-11-21 01:54:50,746 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 0 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 200 mSolverCounterSat, 100 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 14 SdHoareTripleChecker+Invalid, 300 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 100 IncrementalHoareTripleChecker+Valid, 200 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-21 01:54:50,746 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 14 Invalid, 300 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [100 Valid, 200 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-21 01:54:50,747 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 195 states. [2021-11-21 01:54:50,762 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 195 to 195. [2021-11-21 01:54:50,763 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 195 states, 194 states have (on average 1.0051546391752577) internal successors, (195), 194 states have internal predecessors, (195), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:54:50,765 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 195 states to 195 states and 195 transitions. [2021-11-21 01:54:50,765 INFO L78 Accepts]: Start accepts. Automaton has 195 states and 195 transitions. Word has length 98 [2021-11-21 01:54:50,766 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:54:50,766 INFO L470 AbstractCegarLoop]: Abstraction has 195 states and 195 transitions. [2021-11-21 01:54:50,767 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 193 states, 193 states have (on average 1.0155440414507773) internal successors, (196), 192 states have internal predecessors, (196), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:54:50,767 INFO L276 IsEmpty]: Start isEmpty. Operand 195 states and 195 transitions. [2021-11-21 01:54:50,770 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 195 [2021-11-21 01:54:50,770 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:54:50,770 INFO L514 BasicCegarLoop]: trace histogram [190, 1, 1, 1, 1] [2021-11-21 01:54:50,809 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40ca0b76-edbe-49c0-a738-414261171251/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-21 01:54:50,995 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40ca0b76-edbe-49c0-a738-414261171251/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:54:50,995 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:54:50,995 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:54:50,996 INFO L85 PathProgramCache]: Analyzing trace with hash 1544332582, now seen corresponding path program 7 times [2021-11-21 01:54:50,996 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:54:50,996 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [899205928] [2021-11-21 01:54:50,996 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:54:50,996 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:54:51,329 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:55:03,301 INFO L134 CoverageAnalysis]: Checked inductivity of 18145 backedges. 0 proven. 18145 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:55:03,301 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:55:03,302 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [899205928] [2021-11-21 01:55:03,302 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [899205928] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:55:03,302 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1435283870] [2021-11-21 01:55:03,302 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-21 01:55:03,302 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:55:03,302 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40ca0b76-edbe-49c0-a738-414261171251/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:55:03,303 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40ca0b76-edbe-49c0-a738-414261171251/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:55:03,304 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40ca0b76-edbe-49c0-a738-414261171251/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-21 01:55:03,514 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:55:03,522 INFO L263 TraceCheckSpWp]: Trace formula consists of 1190 conjuncts, 192 conjunts are in the unsatisfiable core [2021-11-21 01:55:03,534 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:55:04,059 INFO L134 CoverageAnalysis]: Checked inductivity of 18145 backedges. 0 proven. 18145 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:55:04,059 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:55:39,583 INFO L134 CoverageAnalysis]: Checked inductivity of 18145 backedges. 0 proven. 18145 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:55:39,583 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1435283870] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:55:39,583 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [650568388] [2021-11-21 01:55:39,585 INFO L159 IcfgInterpreter]: Started Sifa with 5 locations of interest [2021-11-21 01:55:39,585 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:55:39,586 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:55:39,586 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:55:39,586 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:55:39,600 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:55:39,601 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:55:39,602 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:55:39,609 INFO L354 Elim1Store]: treesize reduction 19, result has 32.1 percent of original size [2021-11-21 01:55:39,609 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 32 treesize of output 34 [2021-11-21 01:55:39,631 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:55:39,632 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:55:39,634 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:55:39,659 INFO L354 Elim1Store]: treesize reduction 60, result has 24.1 percent of original size [2021-11-21 01:55:39,660 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 01:55:39,680 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:55:39,683 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:55:39,686 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 7 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 27 [2021-11-21 01:55:39,754 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:55:39,755 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:55:39,755 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 3 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 51 treesize of output 48 [2021-11-21 01:55:39,847 INFO L354 Elim1Store]: treesize reduction 68, result has 13.9 percent of original size [2021-11-21 01:55:39,848 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 5 case distinctions, treesize of input 261 treesize of output 248 [2021-11-21 01:55:40,416 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:55:40,425 INFO L354 Elim1Store]: treesize reduction 22, result has 35.3 percent of original size [2021-11-21 01:55:40,425 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 29 treesize of output 28 [2021-11-21 01:55:40,588 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:55:41,015 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:55:41,015 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:55:41,015 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [192, 192, 192] total 384 [2021-11-21 01:55:41,015 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [717622591] [2021-11-21 01:55:41,015 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:55:41,016 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 385 states [2021-11-21 01:55:41,016 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:55:41,035 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 385 interpolants. [2021-11-21 01:55:41,046 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=73929, Invalid=76227, Unknown=0, NotChecked=0, Total=150156 [2021-11-21 01:55:41,047 INFO L87 Difference]: Start difference. First operand 195 states and 195 transitions. Second operand has 385 states, 385 states have (on average 1.0077922077922077) internal successors, (388), 384 states have internal predecessors, (388), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:55:42,733 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:55:42,733 INFO L93 Difference]: Finished difference Result 390 states and 581 transitions. [2021-11-21 01:55:42,734 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 384 states. [2021-11-21 01:55:42,734 INFO L78 Accepts]: Start accepts. Automaton has has 385 states, 385 states have (on average 1.0077922077922077) internal successors, (388), 384 states have internal predecessors, (388), 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 194 [2021-11-21 01:55:42,735 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:55:42,738 INFO L225 Difference]: With dead ends: 390 [2021-11-21 01:55:42,738 INFO L226 Difference]: Without dead ends: 387 [2021-11-21 01:55:42,746 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 772 GetRequests, 386 SyntacticMatches, 0 SemanticMatches, 386 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2479 ImplicationChecksByTransitivity, 46.8s TimeCoverageRelationStatistics Valid=73929, Invalid=76227, Unknown=0, NotChecked=0, Total=150156 [2021-11-21 01:55:42,746 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 0 mSDsluCounter, 16 mSDsCounter, 0 mSdLazyCounter, 393 mSolverCounterSat, 200 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 18 SdHoareTripleChecker+Invalid, 593 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 200 IncrementalHoareTripleChecker+Valid, 393 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-21 01:55:42,746 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 18 Invalid, 593 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [200 Valid, 393 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-21 01:55:42,747 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 387 states. [2021-11-21 01:55:42,773 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 387 to 387. [2021-11-21 01:55:42,774 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 387 states, 386 states have (on average 1.0025906735751295) internal successors, (387), 386 states have internal predecessors, (387), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:55:42,778 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 387 states to 387 states and 387 transitions. [2021-11-21 01:55:42,778 INFO L78 Accepts]: Start accepts. Automaton has 387 states and 387 transitions. Word has length 194 [2021-11-21 01:55:42,779 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:55:42,779 INFO L470 AbstractCegarLoop]: Abstraction has 387 states and 387 transitions. [2021-11-21 01:55:42,780 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 385 states, 385 states have (on average 1.0077922077922077) internal successors, (388), 384 states have internal predecessors, (388), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:55:42,780 INFO L276 IsEmpty]: Start isEmpty. Operand 387 states and 387 transitions. [2021-11-21 01:55:42,813 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 387 [2021-11-21 01:55:42,814 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:55:42,814 INFO L514 BasicCegarLoop]: trace histogram [382, 1, 1, 1, 1] [2021-11-21 01:55:42,837 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40ca0b76-edbe-49c0-a738-414261171251/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-11-21 01:55:43,021 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40ca0b76-edbe-49c0-a738-414261171251/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:55:43,022 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:55:43,022 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:55:43,022 INFO L85 PathProgramCache]: Analyzing trace with hash -1191628506, now seen corresponding path program 8 times [2021-11-21 01:55:43,022 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:55:43,023 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1242764102] [2021-11-21 01:55:43,023 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:55:43,023 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:55:43,892 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:56:31,563 INFO L134 CoverageAnalysis]: Checked inductivity of 73153 backedges. 0 proven. 73153 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:56:31,563 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:56:31,563 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1242764102] [2021-11-21 01:56:31,563 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1242764102] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:56:31,564 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [412586549] [2021-11-21 01:56:31,564 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 01:56:31,564 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:56:31,564 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40ca0b76-edbe-49c0-a738-414261171251/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:56:31,582 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40ca0b76-edbe-49c0-a738-414261171251/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:56:31,583 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40ca0b76-edbe-49c0-a738-414261171251/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process