./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/array-examples/standard_reverse_ground.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_1080b871-a993-4b63-a642-6a0dea8b757e/bin/utaipan-TEXQjIfE4P/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1080b871-a993-4b63-a642-6a0dea8b757e/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_1080b871-a993-4b63-a642-6a0dea8b757e/bin/utaipan-TEXQjIfE4P/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1080b871-a993-4b63-a642-6a0dea8b757e/bin/utaipan-TEXQjIfE4P/config/TaipanReach.xml -i ../../sv-benchmarks/c/array-examples/standard_reverse_ground.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1080b871-a993-4b63-a642-6a0dea8b757e/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_1080b871-a993-4b63-a642-6a0dea8b757e/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 cce6de3c48d80c64796d0d47269c605ab237c0f177720038579dfa7efd061db0 --- Real Ultimate output --- This is Ultimate 0.2.1-dev-53f42b1 [2021-11-20 23:35:33,128 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-20 23:35:33,132 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-20 23:35:33,184 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-20 23:35:33,184 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-20 23:35:33,192 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-20 23:35:33,196 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-20 23:35:33,201 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-20 23:35:33,204 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-20 23:35:33,210 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-20 23:35:33,212 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-20 23:35:33,214 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-20 23:35:33,215 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-20 23:35:33,218 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-20 23:35:33,220 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-20 23:35:33,223 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-20 23:35:33,225 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-20 23:35:33,226 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-20 23:35:33,231 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-20 23:35:33,240 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-20 23:35:33,243 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-20 23:35:33,245 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-20 23:35:33,248 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-20 23:35:33,250 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-20 23:35:33,260 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-20 23:35:33,261 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-20 23:35:33,261 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-20 23:35:33,264 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-20 23:35:33,265 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-20 23:35:33,266 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-20 23:35:33,267 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-20 23:35:33,268 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-20 23:35:33,271 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-20 23:35:33,272 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-20 23:35:33,274 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-20 23:35:33,274 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-20 23:35:33,275 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-20 23:35:33,276 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-20 23:35:33,276 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-20 23:35:33,277 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-20 23:35:33,278 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-20 23:35:33,279 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1080b871-a993-4b63-a642-6a0dea8b757e/bin/utaipan-TEXQjIfE4P/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-20 23:35:33,330 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-20 23:35:33,331 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-20 23:35:33,332 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-20 23:35:33,332 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-20 23:35:33,333 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-20 23:35:33,333 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-20 23:35:33,334 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-20 23:35:33,334 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-20 23:35:33,334 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-20 23:35:33,334 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-20 23:35:33,336 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-20 23:35:33,336 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-20 23:35:33,336 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-20 23:35:33,337 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-20 23:35:33,337 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-20 23:35:33,337 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-20 23:35:33,338 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-20 23:35:33,338 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-20 23:35:33,339 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-20 23:35:33,340 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-20 23:35:33,340 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-20 23:35:33,340 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-20 23:35:33,341 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-20 23:35:33,341 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-20 23:35:33,341 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-20 23:35:33,341 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-20 23:35:33,343 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-20 23:35:33,343 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-20 23:35:33,344 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-20 23:35:33,344 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-20 23:35:33,344 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-20 23:35:33,345 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-20 23:35:33,345 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-20 23:35:33,345 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-20 23:35:33,346 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-20 23:35:33,346 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-20 23:35:33,346 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-20 23:35:33,347 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-20 23:35:33,347 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-20 23:35:33,347 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-20 23:35:33,347 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-20 23:35:33,348 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_1080b871-a993-4b63-a642-6a0dea8b757e/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1080b871-a993-4b63-a642-6a0dea8b757e/bin/utaipan-TEXQjIfE4P Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> cce6de3c48d80c64796d0d47269c605ab237c0f177720038579dfa7efd061db0 [2021-11-20 23:35:33,708 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-20 23:35:33,733 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-20 23:35:33,736 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-20 23:35:33,737 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-20 23:35:33,738 INFO L275 PluginConnector]: CDTParser initialized [2021-11-20 23:35:33,739 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1080b871-a993-4b63-a642-6a0dea8b757e/bin/utaipan-TEXQjIfE4P/../../sv-benchmarks/c/array-examples/standard_reverse_ground.i [2021-11-20 23:35:33,824 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1080b871-a993-4b63-a642-6a0dea8b757e/bin/utaipan-TEXQjIfE4P/data/897682521/7863aa8f0e5e4d0a88e2f41fbfc3b665/FLAGb9764b158 [2021-11-20 23:35:34,345 INFO L306 CDTParser]: Found 1 translation units. [2021-11-20 23:35:34,346 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1080b871-a993-4b63-a642-6a0dea8b757e/sv-benchmarks/c/array-examples/standard_reverse_ground.i [2021-11-20 23:35:34,360 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1080b871-a993-4b63-a642-6a0dea8b757e/bin/utaipan-TEXQjIfE4P/data/897682521/7863aa8f0e5e4d0a88e2f41fbfc3b665/FLAGb9764b158 [2021-11-20 23:35:34,710 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1080b871-a993-4b63-a642-6a0dea8b757e/bin/utaipan-TEXQjIfE4P/data/897682521/7863aa8f0e5e4d0a88e2f41fbfc3b665 [2021-11-20 23:35:34,714 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-20 23:35:34,717 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-20 23:35:34,722 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-20 23:35:34,723 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-20 23:35:34,727 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-20 23:35:34,728 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.11 11:35:34" (1/1) ... [2021-11-20 23:35:34,731 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@6a080c8a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:35:34, skipping insertion in model container [2021-11-20 23:35:34,732 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.11 11:35:34" (1/1) ... [2021-11-20 23:35:34,741 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-20 23:35:34,760 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-20 23:35:34,975 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_1080b871-a993-4b63-a642-6a0dea8b757e/sv-benchmarks/c/array-examples/standard_reverse_ground.i[816,829] [2021-11-20 23:35:34,990 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-20 23:35:34,997 INFO L203 MainTranslator]: Completed pre-run [2021-11-20 23:35:35,009 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_1080b871-a993-4b63-a642-6a0dea8b757e/sv-benchmarks/c/array-examples/standard_reverse_ground.i[816,829] [2021-11-20 23:35:35,015 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-20 23:35:35,030 INFO L208 MainTranslator]: Completed translation [2021-11-20 23:35:35,030 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:35:35 WrapperNode [2021-11-20 23:35:35,030 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-20 23:35:35,031 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-20 23:35:35,032 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-20 23:35:35,032 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-20 23:35:35,042 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:35:35" (1/1) ... [2021-11-20 23:35:35,050 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:35:35" (1/1) ... [2021-11-20 23:35:35,069 INFO L137 Inliner]: procedures = 16, calls = 18, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 63 [2021-11-20 23:35:35,070 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-20 23:35:35,071 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-20 23:35:35,071 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-20 23:35:35,071 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-20 23:35:35,080 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:35:35" (1/1) ... [2021-11-20 23:35:35,080 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:35:35" (1/1) ... [2021-11-20 23:35:35,082 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:35:35" (1/1) ... [2021-11-20 23:35:35,082 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:35:35" (1/1) ... [2021-11-20 23:35:35,087 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:35:35" (1/1) ... [2021-11-20 23:35:35,091 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:35:35" (1/1) ... [2021-11-20 23:35:35,093 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:35:35" (1/1) ... [2021-11-20 23:35:35,094 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-20 23:35:35,095 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-20 23:35:35,096 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-20 23:35:35,096 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-20 23:35:35,097 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:35:35" (1/1) ... [2021-11-20 23:35:35,111 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-20 23:35:35,125 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1080b871-a993-4b63-a642-6a0dea8b757e/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:35:35,140 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1080b871-a993-4b63-a642-6a0dea8b757e/bin/utaipan-TEXQjIfE4P/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-20 23:35:35,152 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1080b871-a993-4b63-a642-6a0dea8b757e/bin/utaipan-TEXQjIfE4P/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-20 23:35:35,181 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-20 23:35:35,181 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-20 23:35:35,182 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-11-20 23:35:35,182 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-11-20 23:35:35,182 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-20 23:35:35,182 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-20 23:35:35,182 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-11-20 23:35:35,182 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-11-20 23:35:35,254 INFO L236 CfgBuilder]: Building ICFG [2021-11-20 23:35:35,257 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-20 23:35:35,461 INFO L277 CfgBuilder]: Performing block encoding [2021-11-20 23:35:35,518 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-20 23:35:35,519 INFO L301 CfgBuilder]: Removed 3 assume(true) statements. [2021-11-20 23:35:35,522 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.11 11:35:35 BoogieIcfgContainer [2021-11-20 23:35:35,522 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-20 23:35:35,525 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-20 23:35:35,525 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-20 23:35:35,529 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-20 23:35:35,529 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.11 11:35:34" (1/3) ... [2021-11-20 23:35:35,530 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@65b0b03e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.11 11:35:35, skipping insertion in model container [2021-11-20 23:35:35,531 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:35:35" (2/3) ... [2021-11-20 23:35:35,531 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@65b0b03e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.11 11:35:35, skipping insertion in model container [2021-11-20 23:35:35,531 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.11 11:35:35" (3/3) ... [2021-11-20 23:35:35,533 INFO L111 eAbstractionObserver]: Analyzing ICFG standard_reverse_ground.i [2021-11-20 23:35:35,543 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-20 23:35:35,543 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-20 23:35:35,611 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-20 23:35:35,624 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 [2021-11-20 23:35:35,624 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-20 23:35:35,655 INFO L276 IsEmpty]: Start isEmpty. Operand has 9 states, 7 states have (on average 1.7142857142857142) internal successors, (12), 8 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:35:35,664 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2021-11-20 23:35:35,667 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:35:35,668 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2021-11-20 23:35:35,668 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:35:35,675 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:35:35,676 INFO L85 PathProgramCache]: Analyzing trace with hash -1598963128, now seen corresponding path program 1 times [2021-11-20 23:35:35,687 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:35:35,687 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1843875541] [2021-11-20 23:35:35,688 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:35:35,689 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:35:35,813 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:35:35,923 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:35:35,939 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:35:35,940 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1843875541] [2021-11-20 23:35:35,941 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1843875541] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:35:35,941 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 23:35:35,941 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-20 23:35:35,943 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [123770277] [2021-11-20 23:35:35,944 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:35:35,948 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-20 23:35:35,949 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:35:36,031 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-20 23:35:36,032 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-20 23:35:36,034 INFO L87 Difference]: Start difference. First operand has 9 states, 7 states have (on average 1.7142857142857142) internal successors, (12), 8 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 3 states, 3 states have (on average 2.0) internal successors, (6), 2 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:35:36,126 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:35:36,127 INFO L93 Difference]: Finished difference Result 18 states and 25 transitions. [2021-11-20 23:35:36,128 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-20 23:35:36,129 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.0) internal successors, (6), 2 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 6 [2021-11-20 23:35:36,130 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:35:36,138 INFO L225 Difference]: With dead ends: 18 [2021-11-20 23:35:36,139 INFO L226 Difference]: Without dead ends: 10 [2021-11-20 23:35:36,142 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 [2021-11-20 23:35:36,149 INFO L933 BasicCegarLoop]: 4 mSDtfsCounter, 0 mSDsluCounter, 6 mSDsCounter, 0 mSdLazyCounter, 12 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 8 SdHoareTripleChecker+Invalid, 14 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 12 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-20 23:35:36,151 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 8 Invalid, 14 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 12 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-20 23:35:36,171 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 10 states. [2021-11-20 23:35:36,186 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 10 to 10. [2021-11-20 23:35:36,187 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 10 states, 9 states have (on average 1.3333333333333333) internal successors, (12), 9 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:35:36,189 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 10 states to 10 states and 12 transitions. [2021-11-20 23:35:36,190 INFO L78 Accepts]: Start accepts. Automaton has 10 states and 12 transitions. Word has length 6 [2021-11-20 23:35:36,191 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:35:36,191 INFO L470 AbstractCegarLoop]: Abstraction has 10 states and 12 transitions. [2021-11-20 23:35:36,192 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 2.0) internal successors, (6), 2 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:35:36,192 INFO L276 IsEmpty]: Start isEmpty. Operand 10 states and 12 transitions. [2021-11-20 23:35:36,192 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2021-11-20 23:35:36,193 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:35:36,193 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:35:36,194 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-20 23:35:36,195 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:35:36,197 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:35:36,198 INFO L85 PathProgramCache]: Analyzing trace with hash 757882845, now seen corresponding path program 1 times [2021-11-20 23:35:36,198 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:35:36,199 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [564849700] [2021-11-20 23:35:36,200 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:35:36,200 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:35:36,239 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:35:36,299 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-20 23:35:36,300 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:35:36,301 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [564849700] [2021-11-20 23:35:36,301 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [564849700] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:35:36,302 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [424265952] [2021-11-20 23:35:36,302 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:35:36,302 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:35:36,303 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1080b871-a993-4b63-a642-6a0dea8b757e/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:35:36,305 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1080b871-a993-4b63-a642-6a0dea8b757e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:35:36,327 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1080b871-a993-4b63-a642-6a0dea8b757e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-20 23:35:36,382 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:35:36,384 INFO L263 TraceCheckSpWp]: Trace formula consists of 65 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-20 23:35:36,389 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:35:36,476 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-20 23:35:36,476 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:35:36,530 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-20 23:35:36,531 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [424265952] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:35:36,535 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1963158619] [2021-11-20 23:35:36,570 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-20 23:35:36,571 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:35:36,576 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:35:36,582 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:35:36,583 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:35:36,717 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:35:36,725 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:35:36,792 INFO L354 Elim1Store]: treesize reduction 37, result has 32.7 percent of original size [2021-11-20 23:35:36,793 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 [2021-11-20 23:35:36,904 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:35:36,906 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:35:36,910 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:35:36,911 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:35:36,963 INFO L354 Elim1Store]: treesize reduction 60, result has 24.1 percent of original size [2021-11-20 23:35:36,964 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 [2021-11-20 23:35:37,106 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:35:37,111 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 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 0 case distinctions, treesize of input 39 treesize of output 41 [2021-11-20 23:35:37,379 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:35:37,382 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:35:37,389 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:35:37,407 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-20 23:35:37,408 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 240 treesize of output 228 [2021-11-20 23:35:37,749 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 21 [2021-11-20 23:35:37,877 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:35:37,878 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 25 [2021-11-20 23:35:37,975 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:35:37,976 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:35:37,981 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:35:37,983 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:35:38,005 INFO L354 Elim1Store]: treesize reduction 72, result has 14.3 percent of original size [2021-11-20 23:35:38,006 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 55 treesize of output 60 [2021-11-20 23:35:38,105 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:35:38,106 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 25 [2021-11-20 23:35:38,429 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:35:38,602 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:35:38,602 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:35:38,603 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3, 3] total 6 [2021-11-20 23:35:38,603 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1743022827] [2021-11-20 23:35:38,604 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:35:38,604 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-20 23:35:38,605 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:35:38,605 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-20 23:35:38,606 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=75, Unknown=0, NotChecked=0, Total=110 [2021-11-20 23:35:38,606 INFO L87 Difference]: Start difference. First operand 10 states and 12 transitions. Second operand has 7 states, 7 states have (on average 1.8571428571428572) internal successors, (13), 6 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:35:38,653 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:35:38,653 INFO L93 Difference]: Finished difference Result 23 states and 32 transitions. [2021-11-20 23:35:38,653 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-20 23:35:38,654 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 1.8571428571428572) internal successors, (13), 6 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 8 [2021-11-20 23:35:38,654 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:35:38,655 INFO L225 Difference]: With dead ends: 23 [2021-11-20 23:35:38,655 INFO L226 Difference]: Without dead ends: 16 [2021-11-20 23:35:38,657 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 16 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 28 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=35, Invalid=75, Unknown=0, NotChecked=0, Total=110 [2021-11-20 23:35:38,661 INFO L933 BasicCegarLoop]: 4 mSDtfsCounter, 0 mSDsluCounter, 10 mSDsCounter, 0 mSdLazyCounter, 20 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 12 SdHoareTripleChecker+Invalid, 34 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 20 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-20 23:35:38,662 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 12 Invalid, 34 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 20 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-20 23:35:38,665 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2021-11-20 23:35:38,670 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2021-11-20 23:35:38,670 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 16 states, 15 states have (on average 1.2) internal successors, (18), 15 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:35:38,671 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 18 transitions. [2021-11-20 23:35:38,672 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 18 transitions. Word has length 8 [2021-11-20 23:35:38,672 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:35:38,672 INFO L470 AbstractCegarLoop]: Abstraction has 16 states and 18 transitions. [2021-11-20 23:35:38,672 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 1.8571428571428572) internal successors, (13), 6 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:35:38,673 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 18 transitions. [2021-11-20 23:35:38,673 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2021-11-20 23:35:38,674 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:35:38,674 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 1, 1, 1, 1, 1, 1] [2021-11-20 23:35:38,714 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1080b871-a993-4b63-a642-6a0dea8b757e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-20 23:35:38,887 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1080b871-a993-4b63-a642-6a0dea8b757e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:35:38,888 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:35:38,888 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:35:38,888 INFO L85 PathProgramCache]: Analyzing trace with hash 910138760, now seen corresponding path program 2 times [2021-11-20 23:35:38,888 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:35:38,889 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1791543811] [2021-11-20 23:35:38,889 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:35:38,889 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:35:38,945 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:35:39,033 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-20 23:35:39,034 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:35:39,034 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1791543811] [2021-11-20 23:35:39,034 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1791543811] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:35:39,037 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [930943513] [2021-11-20 23:35:39,038 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-20 23:35:39,038 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:35:39,038 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1080b871-a993-4b63-a642-6a0dea8b757e/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:35:39,039 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1080b871-a993-4b63-a642-6a0dea8b757e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:35:39,055 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1080b871-a993-4b63-a642-6a0dea8b757e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-20 23:35:39,085 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-11-20 23:35:39,085 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:35:39,087 INFO L263 TraceCheckSpWp]: Trace formula consists of 75 conjuncts, 16 conjunts are in the unsatisfiable core [2021-11-20 23:35:39,088 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:35:39,099 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-11-20 23:35:39,192 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 33 treesize of output 32 [2021-11-20 23:35:39,384 INFO L354 Elim1Store]: treesize reduction 88, result has 7.4 percent of original size [2021-11-20 23:35:39,385 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 69 treesize of output 39 [2021-11-20 23:35:39,403 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-11-20 23:35:39,404 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-20 23:35:39,404 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [930943513] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:35:39,404 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-20 23:35:39,405 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [6] total 10 [2021-11-20 23:35:39,405 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1432753525] [2021-11-20 23:35:39,405 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:35:39,406 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-20 23:35:39,406 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:35:39,407 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-20 23:35:39,408 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=79, Unknown=0, NotChecked=0, Total=110 [2021-11-20 23:35:39,408 INFO L87 Difference]: Start difference. First operand 16 states and 18 transitions. Second operand has 6 states, 6 states have (on average 1.5) internal successors, (9), 5 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) [2021-11-20 23:35:39,436 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:35:39,436 INFO L93 Difference]: Finished difference Result 22 states and 24 transitions. [2021-11-20 23:35:39,437 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-20 23:35:39,437 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 1.5) internal successors, (9), 5 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) Word has length 14 [2021-11-20 23:35:39,438 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:35:39,439 INFO L225 Difference]: With dead ends: 22 [2021-11-20 23:35:39,439 INFO L226 Difference]: Without dead ends: 20 [2021-11-20 23:35:39,441 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=31, Invalid=79, Unknown=0, NotChecked=0, Total=110 [2021-11-20 23:35:39,452 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 2 mSDsluCounter, 10 mSDsCounter, 0 mSdLazyCounter, 17 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 8 SdHoareTripleChecker+Invalid, 30 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 17 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 13 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-20 23:35:39,452 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 8 Invalid, 30 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 17 Invalid, 0 Unknown, 13 Unchecked, 0.0s Time] [2021-11-20 23:35:39,453 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2021-11-20 23:35:39,457 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 18. [2021-11-20 23:35:39,457 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 18 states, 17 states have (on average 1.1764705882352942) internal successors, (20), 17 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:35:39,458 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 20 transitions. [2021-11-20 23:35:39,458 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 20 transitions. Word has length 14 [2021-11-20 23:35:39,458 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:35:39,458 INFO L470 AbstractCegarLoop]: Abstraction has 18 states and 20 transitions. [2021-11-20 23:35:39,459 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 1.5) internal successors, (9), 5 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) [2021-11-20 23:35:39,459 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 20 transitions. [2021-11-20 23:35:39,459 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-11-20 23:35:39,459 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:35:39,459 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 2, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:35:39,499 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1080b871-a993-4b63-a642-6a0dea8b757e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-20 23:35:39,660 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1080b871-a993-4b63-a642-6a0dea8b757e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:35:39,660 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:35:39,661 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:35:39,661 INFO L85 PathProgramCache]: Analyzing trace with hash -179519022, now seen corresponding path program 1 times [2021-11-20 23:35:39,661 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:35:39,661 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1635584416] [2021-11-20 23:35:39,661 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:35:39,662 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:35:39,688 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:35:39,750 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-20 23:35:39,750 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:35:39,751 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1635584416] [2021-11-20 23:35:39,751 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1635584416] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:35:39,751 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [691486673] [2021-11-20 23:35:39,751 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:35:39,751 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:35:39,752 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1080b871-a993-4b63-a642-6a0dea8b757e/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:35:39,753 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1080b871-a993-4b63-a642-6a0dea8b757e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:35:39,770 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1080b871-a993-4b63-a642-6a0dea8b757e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-20 23:35:39,801 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:35:39,802 INFO L263 TraceCheckSpWp]: Trace formula consists of 107 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-20 23:35:39,803 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:35:39,852 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-20 23:35:39,852 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:35:39,926 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-20 23:35:39,926 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [691486673] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:35:39,926 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [670571281] [2021-11-20 23:35:39,929 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-20 23:35:39,929 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:35:39,929 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:35:39,930 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:35:39,930 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:35:39,950 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:35:39,951 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:35:39,980 INFO L354 Elim1Store]: treesize reduction 37, result has 32.7 percent of original size [2021-11-20 23:35:39,980 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 [2021-11-20 23:35:40,014 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:35:40,016 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:35:40,017 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:35:40,077 INFO L354 Elim1Store]: treesize reduction 60, result has 24.1 percent of original size [2021-11-20 23:35:40,078 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 [2021-11-20 23:35:40,207 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:35:40,208 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 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 0 case distinctions, treesize of input 34 treesize of output 36 [2021-11-20 23:35:40,336 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:35:40,337 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:35:40,363 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-20 23:35:40,364 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 230 treesize of output 229 [2021-11-20 23:35:40,894 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 21 [2021-11-20 23:35:40,981 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:35:40,982 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 25 [2021-11-20 23:35:41,039 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:35:41,041 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:35:41,044 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:35:41,046 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:35:41,061 INFO L354 Elim1Store]: treesize reduction 72, result has 14.3 percent of original size [2021-11-20 23:35:41,061 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 55 treesize of output 60 [2021-11-20 23:35:41,153 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:35:41,154 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 25 [2021-11-20 23:35:42,306 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:35:42,545 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:35:42,545 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:35:42,545 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 12 [2021-11-20 23:35:42,546 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [311547034] [2021-11-20 23:35:42,546 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:35:42,546 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2021-11-20 23:35:42,546 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:35:42,547 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-11-20 23:35:42,547 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=97, Invalid=209, Unknown=0, NotChecked=0, Total=306 [2021-11-20 23:35:42,547 INFO L87 Difference]: Start difference. First operand 18 states and 20 transitions. Second operand has 13 states, 13 states have (on average 1.6153846153846154) internal successors, (21), 12 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:35:42,621 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:35:42,621 INFO L93 Difference]: Finished difference Result 42 states and 57 transitions. [2021-11-20 23:35:42,622 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-20 23:35:42,622 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 1.6153846153846154) internal successors, (21), 12 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 17 [2021-11-20 23:35:42,622 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:35:42,623 INFO L225 Difference]: With dead ends: 42 [2021-11-20 23:35:42,623 INFO L226 Difference]: Without dead ends: 30 [2021-11-20 23:35:42,624 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 39 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 94 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=97, Invalid=209, Unknown=0, NotChecked=0, Total=306 [2021-11-20 23:35:42,625 INFO L933 BasicCegarLoop]: 4 mSDtfsCounter, 0 mSDsluCounter, 25 mSDsCounter, 0 mSdLazyCounter, 38 mSolverCounterSat, 29 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 24 SdHoareTripleChecker+Invalid, 67 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 29 IncrementalHoareTripleChecker+Valid, 38 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-20 23:35:42,625 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 24 Invalid, 67 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [29 Valid, 38 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-20 23:35:42,626 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2021-11-20 23:35:42,632 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 30. [2021-11-20 23:35:42,632 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 30 states, 29 states have (on average 1.103448275862069) internal successors, (32), 29 states have internal predecessors, (32), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:35:42,633 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 30 states to 30 states and 32 transitions. [2021-11-20 23:35:42,634 INFO L78 Accepts]: Start accepts. Automaton has 30 states and 32 transitions. Word has length 17 [2021-11-20 23:35:42,634 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:35:42,634 INFO L470 AbstractCegarLoop]: Abstraction has 30 states and 32 transitions. [2021-11-20 23:35:42,634 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 1.6153846153846154) internal successors, (21), 12 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:35:42,635 INFO L276 IsEmpty]: Start isEmpty. Operand 30 states and 32 transitions. [2021-11-20 23:35:42,635 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-11-20 23:35:42,636 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:35:42,636 INFO L514 BasicCegarLoop]: trace histogram [10, 10, 2, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:35:42,679 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1080b871-a993-4b63-a642-6a0dea8b757e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-20 23:35:42,853 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1080b871-a993-4b63-a642-6a0dea8b757e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:35:42,853 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:35:42,854 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:35:42,854 INFO L85 PathProgramCache]: Analyzing trace with hash -830818062, now seen corresponding path program 2 times [2021-11-20 23:35:42,854 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:35:42,854 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1375294065] [2021-11-20 23:35:42,854 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:35:42,854 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:35:42,894 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:35:43,017 INFO L134 CoverageAnalysis]: Checked inductivity of 112 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2021-11-20 23:35:43,017 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:35:43,017 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1375294065] [2021-11-20 23:35:43,017 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1375294065] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:35:43,018 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [661896453] [2021-11-20 23:35:43,018 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-20 23:35:43,018 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:35:43,018 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1080b871-a993-4b63-a642-6a0dea8b757e/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:35:43,019 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1080b871-a993-4b63-a642-6a0dea8b757e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:35:43,022 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1080b871-a993-4b63-a642-6a0dea8b757e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-20 23:35:43,086 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-11-20 23:35:43,086 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:35:43,087 INFO L263 TraceCheckSpWp]: Trace formula consists of 107 conjuncts, 19 conjunts are in the unsatisfiable core [2021-11-20 23:35:43,089 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:35:43,094 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-11-20 23:35:43,156 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 25 [2021-11-20 23:35:43,216 INFO L354 Elim1Store]: treesize reduction 58, result has 17.1 percent of original size [2021-11-20 23:35:43,217 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 54 treesize of output 59 [2021-11-20 23:35:43,527 INFO L354 Elim1Store]: treesize reduction 265, result has 2.6 percent of original size [2021-11-20 23:35:43,528 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 6 select indices, 6 select index equivalence classes, 0 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 15 case distinctions, treesize of input 95 treesize of output 42 [2021-11-20 23:35:43,547 INFO L134 CoverageAnalysis]: Checked inductivity of 112 backedges. 18 proven. 3 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2021-11-20 23:35:43,547 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:35:43,750 INFO L354 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2021-11-20 23:35:43,751 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 1314 treesize of output 1 [2021-11-20 23:35:43,787 INFO L134 CoverageAnalysis]: Checked inductivity of 112 backedges. 18 proven. 3 refuted. 0 times theorem prover too weak. 91 trivial. 0 not checked. [2021-11-20 23:35:43,787 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [661896453] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:35:43,788 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [526007160] [2021-11-20 23:35:43,793 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-20 23:35:43,794 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:35:43,795 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:35:43,795 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:35:43,796 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:35:43,832 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:35:43,834 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:35:43,867 INFO L354 Elim1Store]: treesize reduction 60, result has 24.1 percent of original size [2021-11-20 23:35:43,868 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 [2021-11-20 23:35:43,911 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:35:43,912 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:35:43,914 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 [2021-11-20 23:35:44,015 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:35:44,017 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 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 0 case distinctions, treesize of input 34 treesize of output 36 [2021-11-20 23:35:44,125 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:35:44,126 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:35:44,154 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-20 23:35:44,154 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 230 treesize of output 229 [2021-11-20 23:35:44,674 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 21 [2021-11-20 23:35:44,775 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:35:44,776 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 17 [2021-11-20 23:35:44,852 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:35:44,864 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:35:44,889 INFO L354 Elim1Store]: treesize reduction 92, result has 20.0 percent of original size [2021-11-20 23:35:44,890 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 5 case distinctions, treesize of input 47 treesize of output 58 [2021-11-20 23:35:44,958 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:35:44,959 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 25 [2021-11-20 23:35:46,076 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:35:46,391 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:35:46,392 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:35:46,392 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 7, 7] total 23 [2021-11-20 23:35:46,392 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1588635019] [2021-11-20 23:35:46,392 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:35:46,393 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2021-11-20 23:35:46,393 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:35:46,393 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-11-20 23:35:46,394 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=159, Invalid=597, Unknown=0, NotChecked=0, Total=756 [2021-11-20 23:35:46,394 INFO L87 Difference]: Start difference. First operand 30 states and 32 transitions. Second operand has 23 states, 23 states have (on average 1.826086956521739) internal successors, (42), 23 states have internal predecessors, (42), 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) [2021-11-20 23:35:46,845 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:35:46,845 INFO L93 Difference]: Finished difference Result 54 states and 61 transitions. [2021-11-20 23:35:46,846 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-11-20 23:35:46,847 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 1.826086956521739) internal successors, (42), 23 states have internal predecessors, (42), 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 29 [2021-11-20 23:35:46,847 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:35:46,848 INFO L225 Difference]: With dead ends: 54 [2021-11-20 23:35:46,848 INFO L226 Difference]: Without dead ends: 36 [2021-11-20 23:35:46,849 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 114 GetRequests, 70 SyntacticMatches, 1 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 389 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=449, Invalid=1531, Unknown=0, NotChecked=0, Total=1980 [2021-11-20 23:35:46,850 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 0 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 40 mSolverCounterSat, 41 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 13 SdHoareTripleChecker+Invalid, 108 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 41 IncrementalHoareTripleChecker+Valid, 40 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 27 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-20 23:35:46,850 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 13 Invalid, 108 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [41 Valid, 40 Invalid, 0 Unknown, 27 Unchecked, 0.1s Time] [2021-11-20 23:35:46,851 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2021-11-20 23:35:46,865 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 34. [2021-11-20 23:35:46,865 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34 states, 33 states have (on average 1.0909090909090908) internal successors, (36), 33 states have internal predecessors, (36), 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) [2021-11-20 23:35:46,871 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 36 transitions. [2021-11-20 23:35:46,871 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 36 transitions. Word has length 29 [2021-11-20 23:35:46,872 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:35:46,872 INFO L470 AbstractCegarLoop]: Abstraction has 34 states and 36 transitions. [2021-11-20 23:35:46,874 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 23 states have (on average 1.826086956521739) internal successors, (42), 23 states have internal predecessors, (42), 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) [2021-11-20 23:35:46,875 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 36 transitions. [2021-11-20 23:35:46,876 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2021-11-20 23:35:46,876 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:35:46,876 INFO L514 BasicCegarLoop]: trace histogram [11, 10, 3, 2, 2, 1, 1, 1, 1, 1] [2021-11-20 23:35:46,903 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1080b871-a993-4b63-a642-6a0dea8b757e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-20 23:35:47,091 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1080b871-a993-4b63-a642-6a0dea8b757e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:35:47,092 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:35:47,092 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:35:47,092 INFO L85 PathProgramCache]: Analyzing trace with hash 1864862372, now seen corresponding path program 3 times [2021-11-20 23:35:47,092 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:35:47,092 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1394885411] [2021-11-20 23:35:47,092 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:35:47,092 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:35:47,129 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:35:47,245 INFO L134 CoverageAnalysis]: Checked inductivity of 128 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 62 trivial. 0 not checked. [2021-11-20 23:35:47,245 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:35:47,245 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1394885411] [2021-11-20 23:35:47,246 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1394885411] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:35:47,246 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1827549519] [2021-11-20 23:35:47,246 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-20 23:35:47,246 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:35:47,246 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1080b871-a993-4b63-a642-6a0dea8b757e/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:35:47,252 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1080b871-a993-4b63-a642-6a0dea8b757e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:35:47,276 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1080b871-a993-4b63-a642-6a0dea8b757e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-20 23:35:47,322 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-20 23:35:47,322 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:35:47,324 INFO L263 TraceCheckSpWp]: Trace formula consists of 185 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-20 23:35:47,326 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:35:47,403 INFO L134 CoverageAnalysis]: Checked inductivity of 128 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 62 trivial. 0 not checked. [2021-11-20 23:35:47,403 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:35:47,686 INFO L134 CoverageAnalysis]: Checked inductivity of 128 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 62 trivial. 0 not checked. [2021-11-20 23:35:47,686 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1827549519] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:35:47,687 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [955913943] [2021-11-20 23:35:47,689 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-20 23:35:47,689 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:35:47,689 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:35:47,690 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:35:47,690 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:35:47,734 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:35:47,735 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:35:47,760 INFO L354 Elim1Store]: treesize reduction 37, result has 32.7 percent of original size [2021-11-20 23:35:47,761 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 [2021-11-20 23:35:47,799 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:35:47,800 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:35:47,803 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:35:47,804 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:35:47,841 INFO L354 Elim1Store]: treesize reduction 60, result has 24.1 percent of original size [2021-11-20 23:35:47,841 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 [2021-11-20 23:35:47,896 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:35:47,897 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 34 treesize of output 36 [2021-11-20 23:35:48,022 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:35:48,025 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:35:48,045 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-20 23:35:48,046 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 230 treesize of output 229 [2021-11-20 23:35:48,580 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 21 [2021-11-20 23:35:48,640 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:35:48,641 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 25 [2021-11-20 23:35:48,687 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:35:48,689 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:35:48,691 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:35:48,692 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:35:48,703 INFO L354 Elim1Store]: treesize reduction 72, result has 14.3 percent of original size [2021-11-20 23:35:48,704 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 55 treesize of output 60 [2021-11-20 23:35:48,790 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:35:48,795 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 25 [2021-11-20 23:35:49,806 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:35:50,025 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:35:50,025 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:35:50,025 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 26 [2021-11-20 23:35:50,026 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [949869104] [2021-11-20 23:35:50,026 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:35:50,026 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2021-11-20 23:35:50,027 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:35:50,027 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2021-11-20 23:35:50,028 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=370, Invalid=622, Unknown=0, NotChecked=0, Total=992 [2021-11-20 23:35:50,028 INFO L87 Difference]: Start difference. First operand 34 states and 36 transitions. Second operand has 27 states, 27 states have (on average 1.2962962962962963) internal successors, (35), 26 states have internal predecessors, (35), 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) [2021-11-20 23:35:50,193 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:35:50,193 INFO L93 Difference]: Finished difference Result 82 states and 112 transitions. [2021-11-20 23:35:50,194 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-11-20 23:35:50,194 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 27 states have (on average 1.2962962962962963) internal successors, (35), 26 states have internal predecessors, (35), 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 33 [2021-11-20 23:35:50,194 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:35:50,195 INFO L225 Difference]: With dead ends: 82 [2021-11-20 23:35:50,196 INFO L226 Difference]: Without dead ends: 61 [2021-11-20 23:35:50,197 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 110 GetRequests, 80 SyntacticMatches, 0 SemanticMatches, 30 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 227 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=370, Invalid=622, Unknown=0, NotChecked=0, Total=992 [2021-11-20 23:35:50,198 INFO L933 BasicCegarLoop]: 4 mSDtfsCounter, 0 mSDsluCounter, 20 mSDsCounter, 0 mSdLazyCounter, 62 mSolverCounterSat, 94 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 20 SdHoareTripleChecker+Invalid, 156 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 94 IncrementalHoareTripleChecker+Valid, 62 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-20 23:35:50,198 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 20 Invalid, 156 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [94 Valid, 62 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-20 23:35:50,199 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2021-11-20 23:35:50,212 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 61. [2021-11-20 23:35:50,213 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 61 states, 60 states have (on average 1.05) internal successors, (63), 60 states have internal predecessors, (63), 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) [2021-11-20 23:35:50,214 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 63 transitions. [2021-11-20 23:35:50,214 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 63 transitions. Word has length 33 [2021-11-20 23:35:50,215 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:35:50,215 INFO L470 AbstractCegarLoop]: Abstraction has 61 states and 63 transitions. [2021-11-20 23:35:50,215 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 27 states have (on average 1.2962962962962963) internal successors, (35), 26 states have internal predecessors, (35), 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) [2021-11-20 23:35:50,215 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 63 transitions. [2021-11-20 23:35:50,217 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2021-11-20 23:35:50,217 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:35:50,218 INFO L514 BasicCegarLoop]: trace histogram [24, 24, 3, 2, 2, 1, 1, 1, 1, 1] [2021-11-20 23:35:50,262 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1080b871-a993-4b63-a642-6a0dea8b757e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-20 23:35:50,433 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1080b871-a993-4b63-a642-6a0dea8b757e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:35:50,433 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:35:50,434 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:35:50,434 INFO L85 PathProgramCache]: Analyzing trace with hash 654932360, now seen corresponding path program 4 times [2021-11-20 23:35:50,434 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:35:50,434 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1746512934] [2021-11-20 23:35:50,434 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:35:50,434 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:35:50,494 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:35:50,830 INFO L134 CoverageAnalysis]: Checked inductivity of 607 backedges. 0 proven. 300 refuted. 0 times theorem prover too weak. 307 trivial. 0 not checked. [2021-11-20 23:35:50,830 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:35:50,830 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1746512934] [2021-11-20 23:35:50,830 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1746512934] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:35:50,830 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1315935970] [2021-11-20 23:35:50,831 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-20 23:35:50,831 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:35:50,831 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1080b871-a993-4b63-a642-6a0dea8b757e/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:35:50,831 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1080b871-a993-4b63-a642-6a0dea8b757e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:35:50,832 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1080b871-a993-4b63-a642-6a0dea8b757e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-20 23:35:50,918 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:35:50,921 INFO L263 TraceCheckSpWp]: Trace formula consists of 319 conjuncts, 26 conjunts are in the unsatisfiable core [2021-11-20 23:35:50,925 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:35:51,090 INFO L134 CoverageAnalysis]: Checked inductivity of 607 backedges. 0 proven. 300 refuted. 0 times theorem prover too weak. 307 trivial. 0 not checked. [2021-11-20 23:35:51,090 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:35:51,855 INFO L134 CoverageAnalysis]: Checked inductivity of 607 backedges. 0 proven. 300 refuted. 0 times theorem prover too weak. 307 trivial. 0 not checked. [2021-11-20 23:35:51,855 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1315935970] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:35:51,855 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1082994669] [2021-11-20 23:35:51,858 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-20 23:35:51,858 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:35:51,858 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:35:51,858 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:35:51,859 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:35:51,903 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:35:51,905 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:35:51,906 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:35:51,941 INFO L354 Elim1Store]: treesize reduction 60, result has 24.1 percent of original size [2021-11-20 23:35:51,941 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 [2021-11-20 23:35:51,985 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:35:51,987 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:35:51,989 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 [2021-11-20 23:35:52,054 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:35:52,055 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 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 0 case distinctions, treesize of input 39 treesize of output 41 [2021-11-20 23:35:52,123 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:35:52,125 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:35:52,127 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:35:52,140 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-20 23:35:52,141 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 240 treesize of output 228 [2021-11-20 23:35:52,353 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 21 [2021-11-20 23:35:52,418 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:35:52,419 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 17 [2021-11-20 23:35:52,456 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:35:52,457 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:35:52,476 INFO L354 Elim1Store]: treesize reduction 92, result has 20.0 percent of original size [2021-11-20 23:35:52,477 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 5 case distinctions, treesize of input 47 treesize of output 58 [2021-11-20 23:35:52,537 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:35:52,538 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 25 [2021-11-20 23:35:53,394 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:35:53,643 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:35:53,643 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:35:53,643 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26, 26] total 52 [2021-11-20 23:35:53,644 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [103274552] [2021-11-20 23:35:53,644 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:35:53,645 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 53 states [2021-11-20 23:35:53,645 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:35:53,646 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2021-11-20 23:35:53,648 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1397, Invalid=1909, Unknown=0, NotChecked=0, Total=3306 [2021-11-20 23:35:53,648 INFO L87 Difference]: Start difference. First operand 61 states and 63 transitions. Second operand has 53 states, 53 states have (on average 1.150943396226415) internal successors, (61), 52 states have internal predecessors, (61), 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) [2021-11-20 23:35:54,073 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:35:54,074 INFO L93 Difference]: Finished difference Result 148 states and 203 transitions. [2021-11-20 23:35:54,079 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2021-11-20 23:35:54,080 INFO L78 Accepts]: Start accepts. Automaton has has 53 states, 53 states have (on average 1.150943396226415) internal successors, (61), 52 states have internal predecessors, (61), 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 60 [2021-11-20 23:35:54,080 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:35:54,086 INFO L225 Difference]: With dead ends: 148 [2021-11-20 23:35:54,086 INFO L226 Difference]: Without dead ends: 113 [2021-11-20 23:35:54,089 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 204 GetRequests, 148 SyntacticMatches, 0 SemanticMatches, 56 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 474 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=1397, Invalid=1909, Unknown=0, NotChecked=0, Total=3306 [2021-11-20 23:35:54,090 INFO L933 BasicCegarLoop]: 4 mSDtfsCounter, 0 mSDsluCounter, 25 mSDsCounter, 0 mSdLazyCounter, 116 mSolverCounterSat, 266 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 24 SdHoareTripleChecker+Invalid, 382 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 266 IncrementalHoareTripleChecker+Valid, 116 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-20 23:35:54,092 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 24 Invalid, 382 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [266 Valid, 116 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-20 23:35:54,095 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 113 states. [2021-11-20 23:35:54,127 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 113 to 113. [2021-11-20 23:35:54,127 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 113 states, 112 states have (on average 1.0267857142857142) internal successors, (115), 112 states have internal predecessors, (115), 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) [2021-11-20 23:35:54,131 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 113 states to 113 states and 115 transitions. [2021-11-20 23:35:54,132 INFO L78 Accepts]: Start accepts. Automaton has 113 states and 115 transitions. Word has length 60 [2021-11-20 23:35:54,132 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:35:54,132 INFO L470 AbstractCegarLoop]: Abstraction has 113 states and 115 transitions. [2021-11-20 23:35:54,133 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 53 states, 53 states have (on average 1.150943396226415) internal successors, (61), 52 states have internal predecessors, (61), 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) [2021-11-20 23:35:54,133 INFO L276 IsEmpty]: Start isEmpty. Operand 113 states and 115 transitions. [2021-11-20 23:35:54,144 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 113 [2021-11-20 23:35:54,145 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:35:54,146 INFO L514 BasicCegarLoop]: trace histogram [50, 50, 3, 2, 2, 1, 1, 1, 1, 1] [2021-11-20 23:35:54,170 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1080b871-a993-4b63-a642-6a0dea8b757e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-20 23:35:54,351 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1080b871-a993-4b63-a642-6a0dea8b757e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:35:54,352 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:35:54,352 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:35:54,352 INFO L85 PathProgramCache]: Analyzing trace with hash 246965928, now seen corresponding path program 5 times [2021-11-20 23:35:54,352 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:35:54,352 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [61844159] [2021-11-20 23:35:54,352 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:35:54,353 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:35:54,496 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:35:55,727 INFO L134 CoverageAnalysis]: Checked inductivity of 2557 backedges. 0 proven. 1275 refuted. 0 times theorem prover too weak. 1282 trivial. 0 not checked. [2021-11-20 23:35:55,727 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:35:55,728 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [61844159] [2021-11-20 23:35:55,728 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [61844159] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:35:55,728 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [335181945] [2021-11-20 23:35:55,728 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-20 23:35:55,728 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:35:55,728 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1080b871-a993-4b63-a642-6a0dea8b757e/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:35:55,732 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1080b871-a993-4b63-a642-6a0dea8b757e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:35:55,752 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1080b871-a993-4b63-a642-6a0dea8b757e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-20 23:35:55,889 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-11-20 23:35:55,889 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:35:55,891 INFO L263 TraceCheckSpWp]: Trace formula consists of 139 conjuncts, 24 conjunts are in the unsatisfiable core [2021-11-20 23:35:55,897 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:35:55,900 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-11-20 23:35:56,120 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 25 [2021-11-20 23:35:56,179 INFO L354 Elim1Store]: treesize reduction 60, result has 16.7 percent of original size [2021-11-20 23:35:56,179 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 47 treesize of output 52 [2021-11-20 23:35:56,269 INFO L354 Elim1Store]: treesize reduction 150, result has 14.3 percent of original size [2021-11-20 23:35:56,270 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 5 select indices, 5 select index equivalence classes, 1 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 75 treesize of output 86 [2021-11-20 23:35:56,833 INFO L354 Elim1Store]: treesize reduction 513, result has 1.3 percent of original size [2021-11-20 23:35:56,833 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 8 select indices, 8 select index equivalence classes, 0 disjoint index pairs (out of 28 index pairs), introduced 8 new quantified variables, introduced 28 case distinctions, treesize of input 116 treesize of output 45 [2021-11-20 23:35:56,864 INFO L134 CoverageAnalysis]: Checked inductivity of 2557 backedges. 145 proven. 9 refuted. 0 times theorem prover too weak. 2403 trivial. 0 not checked. [2021-11-20 23:35:56,864 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:35:57,348 INFO L354 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2021-11-20 23:35:57,349 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 26532 treesize of output 1 [2021-11-20 23:35:57,463 INFO L134 CoverageAnalysis]: Checked inductivity of 2557 backedges. 144 proven. 10 refuted. 0 times theorem prover too weak. 2403 trivial. 0 not checked. [2021-11-20 23:35:57,464 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [335181945] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:35:57,464 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1826020911] [2021-11-20 23:35:57,466 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-20 23:35:57,466 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:35:57,466 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:35:57,467 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:35:57,467 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:35:57,487 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:35:57,488 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:35:57,515 INFO L354 Elim1Store]: treesize reduction 37, result has 32.7 percent of original size [2021-11-20 23:35:57,516 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 [2021-11-20 23:35:57,543 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:35:57,546 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:35:57,547 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:35:57,581 INFO L354 Elim1Store]: treesize reduction 60, result has 24.1 percent of original size [2021-11-20 23:35:57,582 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 [2021-11-20 23:35:57,693 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:35:57,694 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 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 0 case distinctions, treesize of input 34 treesize of output 36 [2021-11-20 23:35:57,764 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:35:57,764 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:35:57,784 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-20 23:35:57,784 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 230 treesize of output 229 [2021-11-20 23:35:58,150 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 21 [2021-11-20 23:35:58,228 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:35:58,228 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 25 [2021-11-20 23:35:58,282 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:35:58,283 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:35:58,286 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:35:58,287 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:35:58,299 INFO L354 Elim1Store]: treesize reduction 72, result has 14.3 percent of original size [2021-11-20 23:35:58,300 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 55 treesize of output 60 [2021-11-20 23:35:58,366 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:35:58,366 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 25 [2021-11-20 23:35:59,321 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:35:59,742 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:35:59,742 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:35:59,743 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [52, 9, 9] total 67 [2021-11-20 23:35:59,743 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2123789183] [2021-11-20 23:35:59,743 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:35:59,744 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 67 states [2021-11-20 23:35:59,744 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:35:59,745 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 67 interpolants. [2021-11-20 23:35:59,747 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1616, Invalid=3496, Unknown=0, NotChecked=0, Total=5112 [2021-11-20 23:35:59,748 INFO L87 Difference]: Start difference. First operand 113 states and 115 transitions. Second operand has 67 states, 67 states have (on average 1.3432835820895523) internal successors, (90), 67 states have internal predecessors, (90), 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) [2021-11-20 23:36:01,907 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:36:01,908 INFO L93 Difference]: Finished difference Result 178 states and 183 transitions. [2021-11-20 23:36:01,908 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 64 states. [2021-11-20 23:36:01,908 INFO L78 Accepts]: Start accepts. Automaton has has 67 states, 67 states have (on average 1.3432835820895523) internal successors, (90), 67 states have internal predecessors, (90), 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 112 [2021-11-20 23:36:01,909 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:36:01,910 INFO L225 Difference]: With dead ends: 178 [2021-11-20 23:36:01,910 INFO L226 Difference]: Without dead ends: 117 [2021-11-20 23:36:01,916 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 443 GetRequests, 315 SyntacticMatches, 1 SemanticMatches, 127 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2787 ImplicationChecksByTransitivity, 4.1s TimeCoverageRelationStatistics Valid=4872, Invalid=11640, Unknown=0, NotChecked=0, Total=16512 [2021-11-20 23:36:01,917 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 0 mSDsluCounter, 29 mSDsCounter, 0 mSdLazyCounter, 29 mSolverCounterSat, 64 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 27 SdHoareTripleChecker+Invalid, 127 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 64 IncrementalHoareTripleChecker+Valid, 29 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 34 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-20 23:36:01,917 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 27 Invalid, 127 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [64 Valid, 29 Invalid, 0 Unknown, 34 Unchecked, 0.1s Time] [2021-11-20 23:36:01,918 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 117 states. [2021-11-20 23:36:01,939 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 117 to 117. [2021-11-20 23:36:01,940 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 117 states, 116 states have (on average 1.0258620689655173) internal successors, (119), 116 states have internal predecessors, (119), 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) [2021-11-20 23:36:01,941 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 117 states to 117 states and 119 transitions. [2021-11-20 23:36:01,941 INFO L78 Accepts]: Start accepts. Automaton has 117 states and 119 transitions. Word has length 112 [2021-11-20 23:36:01,941 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:36:01,941 INFO L470 AbstractCegarLoop]: Abstraction has 117 states and 119 transitions. [2021-11-20 23:36:01,942 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 67 states, 67 states have (on average 1.3432835820895523) internal successors, (90), 67 states have internal predecessors, (90), 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) [2021-11-20 23:36:01,942 INFO L276 IsEmpty]: Start isEmpty. Operand 117 states and 119 transitions. [2021-11-20 23:36:01,943 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 117 [2021-11-20 23:36:01,943 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:36:01,944 INFO L514 BasicCegarLoop]: trace histogram [51, 50, 4, 3, 3, 1, 1, 1, 1, 1] [2021-11-20 23:36:01,965 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1080b871-a993-4b63-a642-6a0dea8b757e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-11-20 23:36:02,147 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1080b871-a993-4b63-a642-6a0dea8b757e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable7 [2021-11-20 23:36:02,148 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:36:02,148 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:36:02,148 INFO L85 PathProgramCache]: Analyzing trace with hash 1168344758, now seen corresponding path program 6 times [2021-11-20 23:36:02,148 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:36:02,148 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1658213454] [2021-11-20 23:36:02,148 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:36:02,149 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:36:02,239 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:36:03,242 INFO L134 CoverageAnalysis]: Checked inductivity of 2616 backedges. 0 proven. 1326 refuted. 0 times theorem prover too weak. 1290 trivial. 0 not checked. [2021-11-20 23:36:03,243 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:36:03,243 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1658213454] [2021-11-20 23:36:03,243 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1658213454] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:36:03,243 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [388696086] [2021-11-20 23:36:03,243 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-20 23:36:03,243 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:36:03,243 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1080b871-a993-4b63-a642-6a0dea8b757e/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:36:03,244 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1080b871-a993-4b63-a642-6a0dea8b757e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:36:03,245 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1080b871-a993-4b63-a642-6a0dea8b757e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-11-20 23:36:03,388 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-20 23:36:03,388 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:36:03,392 INFO L263 TraceCheckSpWp]: Trace formula consists of 597 conjuncts, 53 conjunts are in the unsatisfiable core [2021-11-20 23:36:03,397 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:36:03,670 INFO L134 CoverageAnalysis]: Checked inductivity of 2616 backedges. 0 proven. 1326 refuted. 0 times theorem prover too weak. 1290 trivial. 0 not checked. [2021-11-20 23:36:03,671 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:36:06,600 INFO L134 CoverageAnalysis]: Checked inductivity of 2616 backedges. 0 proven. 1326 refuted. 0 times theorem prover too weak. 1290 trivial. 0 not checked. [2021-11-20 23:36:06,600 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [388696086] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:36:06,600 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [441242558] [2021-11-20 23:36:06,602 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-20 23:36:06,603 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:36:06,603 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:36:06,603 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:36:06,603 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:36:06,634 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:06,636 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:06,637 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:06,671 INFO L354 Elim1Store]: treesize reduction 60, result has 24.1 percent of original size [2021-11-20 23:36:06,672 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 [2021-11-20 23:36:06,709 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:06,710 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:06,711 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 [2021-11-20 23:36:06,749 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:06,750 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 34 treesize of output 36 [2021-11-20 23:36:06,882 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:06,883 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:36:06,909 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-20 23:36:06,910 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 230 treesize of output 229 [2021-11-20 23:36:07,353 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 21 [2021-11-20 23:36:07,423 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:07,424 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 17 [2021-11-20 23:36:07,466 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:07,467 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:07,496 INFO L354 Elim1Store]: treesize reduction 92, result has 20.0 percent of original size [2021-11-20 23:36:07,496 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 5 case distinctions, treesize of input 47 treesize of output 58 [2021-11-20 23:36:07,587 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:07,588 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 25 [2021-11-20 23:36:08,483 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:36:08,832 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:36:08,832 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:36:08,832 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [53, 53, 53] total 106 [2021-11-20 23:36:08,833 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1317762994] [2021-11-20 23:36:08,833 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:36:08,833 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 107 states [2021-11-20 23:36:08,834 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:36:08,835 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 107 interpolants. [2021-11-20 23:36:08,839 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5690, Invalid=6742, Unknown=0, NotChecked=0, Total=12432 [2021-11-20 23:36:08,839 INFO L87 Difference]: Start difference. First operand 117 states and 119 transitions. Second operand has 107 states, 107 states have (on average 1.074766355140187) internal successors, (115), 106 states have internal predecessors, (115), 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) [2021-11-20 23:36:09,789 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:36:09,789 INFO L93 Difference]: Finished difference Result 288 states and 398 transitions. [2021-11-20 23:36:09,789 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 106 states. [2021-11-20 23:36:09,790 INFO L78 Accepts]: Start accepts. Automaton has has 107 states, 107 states have (on average 1.074766355140187) internal successors, (115), 106 states have internal predecessors, (115), 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 116 [2021-11-20 23:36:09,791 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:36:09,792 INFO L225 Difference]: With dead ends: 288 [2021-11-20 23:36:09,792 INFO L226 Difference]: Without dead ends: 224 [2021-11-20 23:36:09,798 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 399 GetRequests, 289 SyntacticMatches, 0 SemanticMatches, 110 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 987 ImplicationChecksByTransitivity, 3.9s TimeCoverageRelationStatistics Valid=5690, Invalid=6742, Unknown=0, NotChecked=0, Total=12432 [2021-11-20 23:36:09,799 INFO L933 BasicCegarLoop]: 4 mSDtfsCounter, 0 mSDsluCounter, 30 mSDsCounter, 0 mSdLazyCounter, 228 mSolverCounterSat, 587 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 28 SdHoareTripleChecker+Invalid, 815 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 587 IncrementalHoareTripleChecker+Valid, 228 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-20 23:36:09,799 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 28 Invalid, 815 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [587 Valid, 228 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-20 23:36:09,801 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 224 states. [2021-11-20 23:36:09,848 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 224 to 224. [2021-11-20 23:36:09,848 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 224 states, 223 states have (on average 1.0134529147982063) internal successors, (226), 223 states have internal predecessors, (226), 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) [2021-11-20 23:36:09,850 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 224 states to 224 states and 226 transitions. [2021-11-20 23:36:09,850 INFO L78 Accepts]: Start accepts. Automaton has 224 states and 226 transitions. Word has length 116 [2021-11-20 23:36:09,850 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:36:09,851 INFO L470 AbstractCegarLoop]: Abstraction has 224 states and 226 transitions. [2021-11-20 23:36:09,851 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 107 states, 107 states have (on average 1.074766355140187) internal successors, (115), 106 states have internal predecessors, (115), 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) [2021-11-20 23:36:09,851 INFO L276 IsEmpty]: Start isEmpty. Operand 224 states and 226 transitions. [2021-11-20 23:36:09,854 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 224 [2021-11-20 23:36:09,854 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:36:09,854 INFO L514 BasicCegarLoop]: trace histogram [104, 104, 4, 3, 3, 1, 1, 1, 1, 1] [2021-11-20 23:36:09,876 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1080b871-a993-4b63-a642-6a0dea8b757e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-11-20 23:36:10,059 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1080b871-a993-4b63-a642-6a0dea8b757e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable8 [2021-11-20 23:36:10,060 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:36:10,060 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:36:10,060 INFO L85 PathProgramCache]: Analyzing trace with hash 1434658002, now seen corresponding path program 7 times [2021-11-20 23:36:10,060 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:36:10,060 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [410539538] [2021-11-20 23:36:10,061 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:36:10,061 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:36:10,217 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:36:14,057 INFO L134 CoverageAnalysis]: Checked inductivity of 10935 backedges. 0 proven. 5460 refuted. 0 times theorem prover too weak. 5475 trivial. 0 not checked. [2021-11-20 23:36:14,057 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:36:14,057 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [410539538] [2021-11-20 23:36:14,057 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [410539538] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:36:14,057 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [382651313] [2021-11-20 23:36:14,057 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-20 23:36:14,058 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:36:14,058 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1080b871-a993-4b63-a642-6a0dea8b757e/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:36:14,059 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1080b871-a993-4b63-a642-6a0dea8b757e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:36:14,060 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1080b871-a993-4b63-a642-6a0dea8b757e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-11-20 23:36:14,257 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:36:14,263 INFO L263 TraceCheckSpWp]: Trace formula consists of 1131 conjuncts, 106 conjunts are in the unsatisfiable core [2021-11-20 23:36:14,273 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:36:14,740 INFO L134 CoverageAnalysis]: Checked inductivity of 10935 backedges. 0 proven. 5460 refuted. 0 times theorem prover too weak. 5475 trivial. 0 not checked. [2021-11-20 23:36:14,740 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:36:25,858 INFO L134 CoverageAnalysis]: Checked inductivity of 10935 backedges. 0 proven. 5460 refuted. 0 times theorem prover too weak. 5475 trivial. 0 not checked. [2021-11-20 23:36:25,858 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [382651313] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:36:25,858 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [229543016] [2021-11-20 23:36:25,860 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-20 23:36:25,860 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:36:25,860 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:36:25,860 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:36:25,861 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:36:25,873 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:25,875 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:25,901 INFO L354 Elim1Store]: treesize reduction 60, result has 24.1 percent of original size [2021-11-20 23:36:25,902 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 [2021-11-20 23:36:25,926 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:25,927 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:25,928 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 8 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 27 [2021-11-20 23:36:25,996 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:25,997 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 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 0 case distinctions, treesize of input 34 treesize of output 36 [2021-11-20 23:36:26,068 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:26,069 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:36:26,091 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-20 23:36:26,091 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 230 treesize of output 229 [2021-11-20 23:36:26,474 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 21 [2021-11-20 23:36:26,558 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:26,559 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 25 [2021-11-20 23:36:26,609 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:26,611 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:26,613 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:26,614 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:26,625 INFO L354 Elim1Store]: treesize reduction 72, result has 14.3 percent of original size [2021-11-20 23:36:26,625 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 55 treesize of output 60 [2021-11-20 23:36:26,689 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:26,689 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 25 [2021-11-20 23:36:28,319 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:36:29,121 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:36:29,121 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:36:29,122 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [106, 106, 106] total 212 [2021-11-20 23:36:29,122 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1599406415] [2021-11-20 23:36:29,122 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:36:29,123 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 213 states [2021-11-20 23:36:29,124 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:36:29,128 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 213 interpolants. [2021-11-20 23:36:29,132 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=22594, Invalid=24712, Unknown=0, NotChecked=0, Total=47306 [2021-11-20 23:36:29,133 INFO L87 Difference]: Start difference. First operand 224 states and 226 transitions. Second operand has 213 states, 213 states have (on average 1.0375586854460095) internal successors, (221), 212 states have internal predecessors, (221), 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) [2021-11-20 23:36:35,977 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:36:35,977 INFO L93 Difference]: Finished difference Result 554 states and 769 transitions. [2021-11-20 23:36:35,978 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 212 states. [2021-11-20 23:36:35,978 INFO L78 Accepts]: Start accepts. Automaton has has 213 states, 213 states have (on average 1.0375586854460095) internal successors, (221), 212 states have internal predecessors, (221), 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 223 [2021-11-20 23:36:35,979 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:36:35,981 INFO L225 Difference]: With dead ends: 554 [2021-11-20 23:36:35,981 INFO L226 Difference]: Without dead ends: 436 [2021-11-20 23:36:35,985 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 773 GetRequests, 557 SyntacticMatches, 0 SemanticMatches, 216 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1994 ImplicationChecksByTransitivity, 14.9s TimeCoverageRelationStatistics Valid=22594, Invalid=24712, Unknown=0, NotChecked=0, Total=47306 [2021-11-20 23:36:35,986 INFO L933 BasicCegarLoop]: 4 mSDtfsCounter, 0 mSDsluCounter, 20 mSDsCounter, 0 mSdLazyCounter, 436 mSolverCounterSat, 1444 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 20 SdHoareTripleChecker+Invalid, 1880 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1444 IncrementalHoareTripleChecker+Valid, 436 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.1s IncrementalHoareTripleChecker+Time [2021-11-20 23:36:35,987 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 20 Invalid, 1880 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1444 Valid, 436 Invalid, 0 Unknown, 0 Unchecked, 1.1s Time] [2021-11-20 23:36:35,989 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 436 states. [2021-11-20 23:36:36,056 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 436 to 436. [2021-11-20 23:36:36,057 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 436 states, 435 states have (on average 1.006896551724138) internal successors, (438), 435 states have internal predecessors, (438), 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) [2021-11-20 23:36:36,059 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 436 states to 436 states and 438 transitions. [2021-11-20 23:36:36,059 INFO L78 Accepts]: Start accepts. Automaton has 436 states and 438 transitions. Word has length 223 [2021-11-20 23:36:36,060 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:36:36,060 INFO L470 AbstractCegarLoop]: Abstraction has 436 states and 438 transitions. [2021-11-20 23:36:36,061 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 213 states, 213 states have (on average 1.0375586854460095) internal successors, (221), 212 states have internal predecessors, (221), 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) [2021-11-20 23:36:36,061 INFO L276 IsEmpty]: Start isEmpty. Operand 436 states and 438 transitions. [2021-11-20 23:36:36,069 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 436 [2021-11-20 23:36:36,069 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:36:36,070 INFO L514 BasicCegarLoop]: trace histogram [210, 210, 4, 3, 3, 1, 1, 1, 1, 1] [2021-11-20 23:36:36,103 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1080b871-a993-4b63-a642-6a0dea8b757e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2021-11-20 23:36:36,291 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1080b871-a993-4b63-a642-6a0dea8b757e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:36:36,292 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:36:36,292 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:36:36,292 INFO L85 PathProgramCache]: Analyzing trace with hash 1423041202, now seen corresponding path program 8 times [2021-11-20 23:36:36,292 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:36:36,293 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [224622355] [2021-11-20 23:36:36,293 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:36:36,293 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:36:36,832 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:36:52,219 INFO L134 CoverageAnalysis]: Checked inductivity of 44325 backedges. 0 proven. 22155 refuted. 0 times theorem prover too weak. 22170 trivial. 0 not checked. [2021-11-20 23:36:52,219 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:36:52,219 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [224622355] [2021-11-20 23:36:52,219 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [224622355] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:36:52,220 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [947413814] [2021-11-20 23:36:52,220 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-20 23:36:52,220 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:36:52,220 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1080b871-a993-4b63-a642-6a0dea8b757e/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:36:52,224 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1080b871-a993-4b63-a642-6a0dea8b757e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:36:52,225 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1080b871-a993-4b63-a642-6a0dea8b757e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-11-20 23:36:52,522 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2021-11-20 23:36:52,522 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:36:52,525 INFO L263 TraceCheckSpWp]: Trace formula consists of 171 conjuncts, 44 conjunts are in the unsatisfiable core [2021-11-20 23:36:52,533 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:36:52,541 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-11-20 23:36:55,921 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 25 [2021-11-20 23:36:56,062 INFO L354 Elim1Store]: treesize reduction 60, result has 16.7 percent of original size [2021-11-20 23:36:56,062 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 47 treesize of output 52 [2021-11-20 23:36:56,237 INFO L354 Elim1Store]: treesize reduction 154, result has 14.0 percent of original size [2021-11-20 23:36:56,238 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 5 select indices, 5 select index equivalence classes, 1 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 68 treesize of output 79 [2021-11-20 23:36:56,465 INFO L354 Elim1Store]: treesize reduction 279, result has 11.7 percent of original size [2021-11-20 23:36:56,467 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 7 select indices, 7 select index equivalence classes, 1 disjoint index pairs (out of 21 index pairs), introduced 7 new quantified variables, introduced 12 case distinctions, treesize of input 96 treesize of output 113 [2021-11-20 23:36:58,131 INFO L354 Elim1Store]: treesize reduction 712, result has 1.0 percent of original size [2021-11-20 23:36:58,132 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 10 select indices, 10 select index equivalence classes, 1 disjoint index pairs (out of 45 index pairs), introduced 10 new quantified variables, introduced 45 case distinctions, treesize of input 120 treesize of output 48 [2021-11-20 23:36:58,230 INFO L134 CoverageAnalysis]: Checked inductivity of 44325 backedges. 1029 proven. 645 refuted. 0 times theorem prover too weak. 42651 trivial. 0 not checked. [2021-11-20 23:36:58,230 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:37:00,462 INFO L354 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2021-11-20 23:37:00,465 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 6804192 treesize of output 1 [2021-11-20 23:37:01,002 INFO L134 CoverageAnalysis]: Checked inductivity of 44325 backedges. 828 proven. 21 refuted. 0 times theorem prover too weak. 43476 trivial. 0 not checked. [2021-11-20 23:37:01,002 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [947413814] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:37:01,002 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1929230320] [2021-11-20 23:37:01,005 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-20 23:37:01,006 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:37:01,006 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:37:01,006 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:37:01,007 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:37:01,030 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:37:01,032 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:37:01,064 INFO L354 Elim1Store]: treesize reduction 60, result has 24.1 percent of original size [2021-11-20 23:37:01,064 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 [2021-11-20 23:37:01,102 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:37:01,103 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:37:01,104 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 [2021-11-20 23:37:01,175 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:37:01,176 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 39 treesize of output 41 [2021-11-20 23:37:01,295 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:37:01,297 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:37:01,300 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:37:01,315 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-20 23:37:01,316 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 240 treesize of output 228 [2021-11-20 23:37:01,594 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 21 [2021-11-20 23:37:01,684 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:37:01,685 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 25 [2021-11-20 23:37:01,741 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:37:01,742 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:37:01,745 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:37:01,747 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:37:01,763 INFO L354 Elim1Store]: treesize reduction 72, result has 14.3 percent of original size [2021-11-20 23:37:01,763 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 55 treesize of output 60 [2021-11-20 23:37:01,815 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:37:01,816 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 25 [2021-11-20 23:37:02,859 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:37:03,805 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:37:03,806 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:37:03,806 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [212, 15, 11] total 235 [2021-11-20 23:37:03,806 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1056118469] [2021-11-20 23:37:03,806 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:37:03,807 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 235 states [2021-11-20 23:37:03,808 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:37:03,811 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 235 interpolants. [2021-11-20 23:37:03,813 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=24196, Invalid=33164, Unknown=0, NotChecked=0, Total=57360 [2021-11-20 23:37:03,814 INFO L87 Difference]: Start difference. First operand 436 states and 438 transitions. Second operand has 235 states, 235 states have (on average 1.1148936170212767) internal successors, (262), 235 states have internal predecessors, (262), 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) [2021-11-20 23:37:31,935 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:37:31,936 INFO L93 Difference]: Finished difference Result 668 states and 677 transitions. [2021-11-20 23:37:31,936 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 231 states. [2021-11-20 23:37:31,936 INFO L78 Accepts]: Start accepts. Automaton has has 235 states, 235 states have (on average 1.1148936170212767) internal successors, (262), 235 states have internal predecessors, (262), 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 435 [2021-11-20 23:37:31,937 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:37:31,940 INFO L225 Difference]: With dead ends: 668 [2021-11-20 23:37:31,941 INFO L226 Difference]: Without dead ends: 444 [2021-11-20 23:37:31,953 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1737 GetRequests, 1276 SyntacticMatches, 1 SemanticMatches, 460 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 31820 ImplicationChecksByTransitivity, 46.0s TimeCoverageRelationStatistics Valid=73274, Invalid=139708, Unknown=0, NotChecked=0, Total=212982 [2021-11-20 23:37:31,954 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 0 mSDsluCounter, 30 mSDsCounter, 0 mSdLazyCounter, 210 mSolverCounterSat, 727 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 31 SdHoareTripleChecker+Invalid, 1146 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 727 IncrementalHoareTripleChecker+Valid, 210 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 209 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2021-11-20 23:37:31,955 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 31 Invalid, 1146 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [727 Valid, 210 Invalid, 0 Unknown, 209 Unchecked, 0.7s Time] [2021-11-20 23:37:31,956 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 444 states. [2021-11-20 23:37:32,028 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 444 to 440. [2021-11-20 23:37:32,029 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 440 states, 439 states have (on average 1.0068337129840548) internal successors, (442), 439 states have internal predecessors, (442), 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) [2021-11-20 23:37:32,030 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 440 states to 440 states and 442 transitions. [2021-11-20 23:37:32,030 INFO L78 Accepts]: Start accepts. Automaton has 440 states and 442 transitions. Word has length 435 [2021-11-20 23:37:32,031 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:37:32,031 INFO L470 AbstractCegarLoop]: Abstraction has 440 states and 442 transitions. [2021-11-20 23:37:32,032 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 235 states, 235 states have (on average 1.1148936170212767) internal successors, (262), 235 states have internal predecessors, (262), 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) [2021-11-20 23:37:32,032 INFO L276 IsEmpty]: Start isEmpty. Operand 440 states and 442 transitions. [2021-11-20 23:37:32,041 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 440 [2021-11-20 23:37:32,042 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:37:32,042 INFO L514 BasicCegarLoop]: trace histogram [211, 210, 5, 4, 4, 1, 1, 1, 1, 1] [2021-11-20 23:37:32,081 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1080b871-a993-4b63-a642-6a0dea8b757e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2021-11-20 23:37:32,255 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1080b871-a993-4b63-a642-6a0dea8b757e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2021-11-20 23:37:32,256 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:37:32,256 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:37:32,256 INFO L85 PathProgramCache]: Analyzing trace with hash -1653668892, now seen corresponding path program 9 times [2021-11-20 23:37:32,256 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:37:32,256 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [435007820] [2021-11-20 23:37:32,256 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:37:32,256 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:37:32,779 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:37:48,218 INFO L134 CoverageAnalysis]: Checked inductivity of 44547 backedges. 0 proven. 22366 refuted. 0 times theorem prover too weak. 22181 trivial. 0 not checked. [2021-11-20 23:37:48,219 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:37:48,219 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [435007820] [2021-11-20 23:37:48,219 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [435007820] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:37:48,219 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [638999350] [2021-11-20 23:37:48,219 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-20 23:37:48,220 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:37:48,220 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1080b871-a993-4b63-a642-6a0dea8b757e/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:37:48,240 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1080b871-a993-4b63-a642-6a0dea8b757e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:37:48,241 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1080b871-a993-4b63-a642-6a0dea8b757e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2021-11-20 23:37:48,634 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-20 23:37:48,634 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:37:48,649 INFO L263 TraceCheckSpWp]: Trace formula consists of 2209 conjuncts, 213 conjunts are in the unsatisfiable core [2021-11-20 23:37:48,660 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:37:49,513 INFO L134 CoverageAnalysis]: Checked inductivity of 44547 backedges. 0 proven. 22366 refuted. 0 times theorem prover too weak. 22181 trivial. 0 not checked. [2021-11-20 23:37:49,514 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:38:38,165 INFO L134 CoverageAnalysis]: Checked inductivity of 44547 backedges. 0 proven. 22366 refuted. 0 times theorem prover too weak. 22181 trivial. 0 not checked. [2021-11-20 23:38:38,166 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [638999350] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:38:38,166 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [770590810] [2021-11-20 23:38:38,168 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-20 23:38:38,168 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:38:38,168 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:38:38,168 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:38:38,168 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:38:38,182 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:38:38,183 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:38:38,206 INFO L354 Elim1Store]: treesize reduction 37, result has 32.7 percent of original size [2021-11-20 23:38:38,207 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 [2021-11-20 23:38:38,228 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:38:38,230 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:38:38,231 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:38:38,256 INFO L354 Elim1Store]: treesize reduction 60, result has 24.1 percent of original size [2021-11-20 23:38:38,257 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 [2021-11-20 23:38:38,344 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:38:38,345 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 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 0 case distinctions, treesize of input 39 treesize of output 41 [2021-11-20 23:38:38,457 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:38:38,459 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:38:38,461 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:38:38,473 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-20 23:38:38,474 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 240 treesize of output 228 [2021-11-20 23:38:38,668 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 21 [2021-11-20 23:38:38,726 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:38:38,726 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 17 [2021-11-20 23:38:38,774 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:38:38,787 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:38:38,810 INFO L354 Elim1Store]: treesize reduction 92, result has 20.0 percent of original size [2021-11-20 23:38:38,811 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 5 case distinctions, treesize of input 47 treesize of output 58 [2021-11-20 23:38:38,890 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:38:38,890 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 25 [2021-11-20 23:38:40,023 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:38:41,000 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:38:41,001 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:38:41,001 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [213, 213, 213] total 426 [2021-11-20 23:38:41,001 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [331209856] [2021-11-20 23:38:41,001 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:38:41,086 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 427 states [2021-11-20 23:38:41,086 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:38:41,105 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 427 interpolants. [2021-11-20 23:38:41,113 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=90970, Invalid=95222, Unknown=0, NotChecked=0, Total=186192 [2021-11-20 23:38:41,114 INFO L87 Difference]: Start difference. First operand 440 states and 442 transitions. Second operand has 427 states, 427 states have (on average 1.018735362997658) internal successors, (435), 426 states have internal predecessors, (435), 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) [2021-11-20 23:40:26,190 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:40:26,190 INFO L93 Difference]: Finished difference Result 1094 states and 1524 transitions. [2021-11-20 23:40:26,190 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 426 states. [2021-11-20 23:40:26,191 INFO L78 Accepts]: Start accepts. Automaton has has 427 states, 427 states have (on average 1.018735362997658) internal successors, (435), 426 states have internal predecessors, (435), 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 439 [2021-11-20 23:40:26,192 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:40:26,197 INFO L225 Difference]: With dead ends: 1094 [2021-11-20 23:40:26,197 INFO L226 Difference]: Without dead ends: 867 [2021-11-20 23:40:26,211 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1528 GetRequests, 1098 SyntacticMatches, 0 SemanticMatches, 430 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4027 ImplicationChecksByTransitivity, 63.6s TimeCoverageRelationStatistics Valid=90970, Invalid=95222, Unknown=0, NotChecked=0, Total=186192 [2021-11-20 23:40:26,211 INFO L933 BasicCegarLoop]: 4 mSDtfsCounter, 0 mSDsluCounter, 45 mSDsCounter, 0 mSdLazyCounter, 874 mSolverCounterSat, 2478 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 40 SdHoareTripleChecker+Invalid, 3352 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2478 IncrementalHoareTripleChecker+Valid, 874 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.1s IncrementalHoareTripleChecker+Time [2021-11-20 23:40:26,212 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 40 Invalid, 3352 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2478 Valid, 874 Invalid, 0 Unknown, 0 Unchecked, 2.1s Time] [2021-11-20 23:40:26,213 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 867 states. [2021-11-20 23:40:26,353 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 867 to 867. [2021-11-20 23:40:26,355 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 867 states, 866 states have (on average 1.0034642032332564) internal successors, (869), 866 states have internal predecessors, (869), 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) [2021-11-20 23:40:26,358 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 867 states to 867 states and 869 transitions. [2021-11-20 23:40:26,359 INFO L78 Accepts]: Start accepts. Automaton has 867 states and 869 transitions. Word has length 439 [2021-11-20 23:40:26,359 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:40:26,359 INFO L470 AbstractCegarLoop]: Abstraction has 867 states and 869 transitions. [2021-11-20 23:40:26,360 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 427 states, 427 states have (on average 1.018735362997658) internal successors, (435), 426 states have internal predecessors, (435), 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) [2021-11-20 23:40:26,361 INFO L276 IsEmpty]: Start isEmpty. Operand 867 states and 869 transitions. [2021-11-20 23:40:26,368 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 867 [2021-11-20 23:40:26,368 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:40:26,369 INFO L514 BasicCegarLoop]: trace histogram [424, 424, 5, 4, 4, 1, 1, 1, 1, 1] [2021-11-20 23:40:26,409 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1080b871-a993-4b63-a642-6a0dea8b757e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2021-11-20 23:40:26,595 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1080b871-a993-4b63-a642-6a0dea8b757e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:40:26,596 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:40:26,596 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:40:26,596 INFO L85 PathProgramCache]: Analyzing trace with hash 209519176, now seen corresponding path program 10 times [2021-11-20 23:40:26,596 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:40:26,596 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2120081680] [2021-11-20 23:40:26,596 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:40:26,596 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:40:28,473 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:41:31,931 INFO L134 CoverageAnalysis]: Checked inductivity of 180226 backedges. 0 proven. 90100 refuted. 0 times theorem prover too weak. 90126 trivial. 0 not checked. [2021-11-20 23:41:31,931 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:41:31,932 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2120081680] [2021-11-20 23:41:31,932 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2120081680] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:41:31,932 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1824611346] [2021-11-20 23:41:31,932 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-20 23:41:31,932 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:41:31,932 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1080b871-a993-4b63-a642-6a0dea8b757e/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:41:31,933 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1080b871-a993-4b63-a642-6a0dea8b757e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:41:31,934 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_1080b871-a993-4b63-a642-6a0dea8b757e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2021-11-20 23:41:32,706 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:41:32,753 INFO L263 TraceCheckSpWp]: Trace formula consists of 4343 conjuncts, 426 conjunts are in the unsatisfiable core [2021-11-20 23:41:32,778 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:41:34,764 INFO L134 CoverageAnalysis]: Checked inductivity of 180226 backedges. 0 proven. 90100 refuted. 0 times theorem prover too weak. 90126 trivial. 0 not checked. [2021-11-20 23:41:34,764 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:44:45,180 INFO L134 CoverageAnalysis]: Checked inductivity of 180226 backedges. 0 proven. 90100 refuted. 0 times theorem prover too weak. 90126 trivial. 0 not checked. [2021-11-20 23:44:45,180 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1824611346] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:44:45,180 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [60200190] [2021-11-20 23:44:45,183 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2021-11-20 23:44:45,183 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:44:45,184 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:44:45,184 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:44:45,184 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:44:45,216 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:44:45,217 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:44:45,219 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:44:45,220 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:44:45,246 INFO L354 Elim1Store]: treesize reduction 60, result has 24.1 percent of original size [2021-11-20 23:44:45,246 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 [2021-11-20 23:44:45,280 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:44:45,281 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:44:45,282 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 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 [2021-11-20 23:44:45,331 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:44:45,331 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 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 0 case distinctions, treesize of input 39 treesize of output 41 [2021-11-20 23:44:45,411 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:44:45,414 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:44:45,416 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:44:45,431 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-20 23:44:45,431 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 240 treesize of output 228 [2021-11-20 23:44:45,637 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 21 [2021-11-20 23:44:45,692 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:44:45,692 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 25 [2021-11-20 23:44:45,721 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:44:45,722 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:44:45,724 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:44:45,725 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:44:45,735 INFO L354 Elim1Store]: treesize reduction 72, result has 14.3 percent of original size [2021-11-20 23:44:45,736 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 55 treesize of output 60 [2021-11-20 23:44:45,800 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:44:45,800 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 25 [2021-11-20 23:44:46,631 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:44:48,150 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:44:48,150 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:44:48,151 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [426, 426, 426] total 852 [2021-11-20 23:44:48,151 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1239721091] [2021-11-20 23:44:48,151 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:44:48,153 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 853 states [2021-11-20 23:44:48,153 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:44:48,217 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 853 interpolants. [2021-11-20 23:44:48,250 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=363397, Invalid=371909, Unknown=0, NotChecked=0, Total=735306 [2021-11-20 23:44:48,252 INFO L87 Difference]: Start difference. First operand 867 states and 869 transitions. Second operand has 853 states, 853 states have (on average 1.0093786635404456) internal successors, (861), 852 states have internal predecessors, (861), 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)