./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/loops/n.c24.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_c2289cc5-6a5a-45e8-9837-8c6d2aaeb177/bin/utaipan-TEXQjIfE4P/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2289cc5-6a5a-45e8-9837-8c6d2aaeb177/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_c2289cc5-6a5a-45e8-9837-8c6d2aaeb177/bin/utaipan-TEXQjIfE4P/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2289cc5-6a5a-45e8-9837-8c6d2aaeb177/bin/utaipan-TEXQjIfE4P/config/TaipanReach.xml -i ../../sv-benchmarks/c/loops/n.c24.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2289cc5-6a5a-45e8-9837-8c6d2aaeb177/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_c2289cc5-6a5a-45e8-9837-8c6d2aaeb177/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 ff2f22c8c94593047c07aca289bcba7e507bc3ee948a7529dc94c8d7792bd95d --- Real Ultimate output --- This is Ultimate 0.2.1-dev-53f42b1 [2021-11-21 01:59:00,834 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-21 01:59:00,837 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-21 01:59:00,893 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-21 01:59:00,894 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-21 01:59:00,899 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-21 01:59:00,901 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-21 01:59:00,905 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-21 01:59:00,907 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-21 01:59:00,913 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-21 01:59:00,915 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-21 01:59:00,916 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-21 01:59:00,917 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-21 01:59:00,919 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-21 01:59:00,921 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-21 01:59:00,926 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-21 01:59:00,928 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-21 01:59:00,929 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-21 01:59:00,931 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-21 01:59:00,939 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-21 01:59:00,941 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-21 01:59:00,942 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-21 01:59:00,946 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-21 01:59:00,947 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-21 01:59:00,956 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-21 01:59:00,956 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-21 01:59:00,957 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-21 01:59:00,959 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-21 01:59:00,959 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-21 01:59:00,961 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-21 01:59:00,961 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-21 01:59:00,962 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-21 01:59:00,964 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-21 01:59:00,966 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-21 01:59:00,967 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-21 01:59:00,967 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-21 01:59:00,968 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-21 01:59:00,968 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-21 01:59:00,969 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-21 01:59:00,970 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-21 01:59:00,970 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-21 01:59:00,971 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2289cc5-6a5a-45e8-9837-8c6d2aaeb177/bin/utaipan-TEXQjIfE4P/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-21 01:59:01,005 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-21 01:59:01,005 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-21 01:59:01,005 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-21 01:59:01,006 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-21 01:59:01,006 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-21 01:59:01,006 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-21 01:59:01,007 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-21 01:59:01,007 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-21 01:59:01,007 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-21 01:59:01,007 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-21 01:59:01,007 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-21 01:59:01,008 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-21 01:59:01,008 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-21 01:59:01,008 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-21 01:59:01,008 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-21 01:59:01,009 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-21 01:59:01,009 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-21 01:59:01,009 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-21 01:59:01,010 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-21 01:59:01,010 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-21 01:59:01,010 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-21 01:59:01,010 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-21 01:59:01,011 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-21 01:59:01,011 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-21 01:59:01,011 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-21 01:59:01,011 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-21 01:59:01,011 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-21 01:59:01,012 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-21 01:59:01,012 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-21 01:59:01,012 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-21 01:59:01,012 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-21 01:59:01,012 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-21 01:59:01,013 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-21 01:59:01,013 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-21 01:59:01,013 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-21 01:59:01,013 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-21 01:59:01,014 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-21 01:59:01,014 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-21 01:59:01,014 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-21 01:59:01,014 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-21 01:59:01,014 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-21 01:59:01,015 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_c2289cc5-6a5a-45e8-9837-8c6d2aaeb177/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2289cc5-6a5a-45e8-9837-8c6d2aaeb177/bin/utaipan-TEXQjIfE4P Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> ff2f22c8c94593047c07aca289bcba7e507bc3ee948a7529dc94c8d7792bd95d [2021-11-21 01:59:01,309 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-21 01:59:01,330 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-21 01:59:01,332 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-21 01:59:01,334 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-21 01:59:01,334 INFO L275 PluginConnector]: CDTParser initialized [2021-11-21 01:59:01,336 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2289cc5-6a5a-45e8-9837-8c6d2aaeb177/bin/utaipan-TEXQjIfE4P/../../sv-benchmarks/c/loops/n.c24.i [2021-11-21 01:59:01,408 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2289cc5-6a5a-45e8-9837-8c6d2aaeb177/bin/utaipan-TEXQjIfE4P/data/ef65c44a3/22435258f38f4b7c92bbac83440f3be0/FLAG9e030ceaa [2021-11-21 01:59:02,030 INFO L306 CDTParser]: Found 1 translation units. [2021-11-21 01:59:02,031 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2289cc5-6a5a-45e8-9837-8c6d2aaeb177/sv-benchmarks/c/loops/n.c24.i [2021-11-21 01:59:02,046 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2289cc5-6a5a-45e8-9837-8c6d2aaeb177/bin/utaipan-TEXQjIfE4P/data/ef65c44a3/22435258f38f4b7c92bbac83440f3be0/FLAG9e030ceaa [2021-11-21 01:59:02,354 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2289cc5-6a5a-45e8-9837-8c6d2aaeb177/bin/utaipan-TEXQjIfE4P/data/ef65c44a3/22435258f38f4b7c92bbac83440f3be0 [2021-11-21 01:59:02,359 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-21 01:59:02,360 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-21 01:59:02,366 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-21 01:59:02,366 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-21 01:59:02,370 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-21 01:59:02,370 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.11 01:59:02" (1/1) ... [2021-11-21 01:59:02,373 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@220dc927 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:59:02, skipping insertion in model container [2021-11-21 01:59:02,373 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.11 01:59:02" (1/1) ... [2021-11-21 01:59:02,380 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-21 01:59:02,414 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-21 01:59:02,653 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_c2289cc5-6a5a-45e8-9837-8c6d2aaeb177/sv-benchmarks/c/loops/n.c24.i[805,818] [2021-11-21 01:59:02,706 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-21 01:59:02,716 INFO L203 MainTranslator]: Completed pre-run [2021-11-21 01:59:02,729 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_c2289cc5-6a5a-45e8-9837-8c6d2aaeb177/sv-benchmarks/c/loops/n.c24.i[805,818] [2021-11-21 01:59:02,749 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-21 01:59:02,780 INFO L208 MainTranslator]: Completed translation [2021-11-21 01:59:02,781 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:59:02 WrapperNode [2021-11-21 01:59:02,781 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-21 01:59:02,782 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-21 01:59:02,783 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-21 01:59:02,783 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-21 01:59:02,792 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:59:02" (1/1) ... [2021-11-21 01:59:02,804 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:59:02" (1/1) ... [2021-11-21 01:59:02,835 INFO L137 Inliner]: procedures = 68, calls = 33, calls flagged for inlining = 6, calls inlined = 6, statements flattened = 146 [2021-11-21 01:59:02,840 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-21 01:59:02,841 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-21 01:59:02,841 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-21 01:59:02,841 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-21 01:59:02,848 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:59:02" (1/1) ... [2021-11-21 01:59:02,848 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:59:02" (1/1) ... [2021-11-21 01:59:02,851 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:59:02" (1/1) ... [2021-11-21 01:59:02,851 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:59:02" (1/1) ... [2021-11-21 01:59:02,858 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:59:02" (1/1) ... [2021-11-21 01:59:02,863 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:59:02" (1/1) ... [2021-11-21 01:59:02,865 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:59:02" (1/1) ... [2021-11-21 01:59:02,868 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-21 01:59:02,869 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-21 01:59:02,869 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-21 01:59:02,869 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-21 01:59:02,870 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:59:02" (1/1) ... [2021-11-21 01:59:02,889 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-21 01:59:02,911 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2289cc5-6a5a-45e8-9837-8c6d2aaeb177/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:59:02,922 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2289cc5-6a5a-45e8-9837-8c6d2aaeb177/bin/utaipan-TEXQjIfE4P/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-21 01:59:02,931 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2289cc5-6a5a-45e8-9837-8c6d2aaeb177/bin/utaipan-TEXQjIfE4P/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-21 01:59:02,968 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-21 01:59:02,968 INFO L130 BoogieDeclarations]: Found specification of procedure write~unchecked~int [2021-11-21 01:59:02,968 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-11-21 01:59:02,969 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-11-21 01:59:02,969 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-11-21 01:59:02,969 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-11-21 01:59:02,969 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-21 01:59:02,969 INFO L130 BoogieDeclarations]: Found specification of procedure read~unchecked~int [2021-11-21 01:59:02,969 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-21 01:59:02,969 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-21 01:59:03,046 INFO L236 CfgBuilder]: Building ICFG [2021-11-21 01:59:03,047 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-21 01:59:03,355 INFO L277 CfgBuilder]: Performing block encoding [2021-11-21 01:59:03,465 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-21 01:59:03,477 INFO L301 CfgBuilder]: Removed 4 assume(true) statements. [2021-11-21 01:59:03,480 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.11 01:59:03 BoogieIcfgContainer [2021-11-21 01:59:03,480 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-21 01:59:03,481 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-21 01:59:03,482 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-21 01:59:03,488 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-21 01:59:03,488 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.11 01:59:02" (1/3) ... [2021-11-21 01:59:03,489 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@15105138 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.11 01:59:03, skipping insertion in model container [2021-11-21 01:59:03,489 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:59:02" (2/3) ... [2021-11-21 01:59:03,489 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@15105138 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.11 01:59:03, skipping insertion in model container [2021-11-21 01:59:03,490 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.11 01:59:03" (3/3) ... [2021-11-21 01:59:03,491 INFO L111 eAbstractionObserver]: Analyzing ICFG n.c24.i [2021-11-21 01:59:03,496 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-21 01:59:03,496 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-21 01:59:03,570 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-21 01:59:03,589 INFO L339 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mLoopAccelerationTechnique=FAST_UPR [2021-11-21 01:59:03,589 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-21 01:59:03,613 INFO L276 IsEmpty]: Start isEmpty. Operand has 22 states, 20 states have (on average 1.7) internal successors, (34), 21 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:59:03,618 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2021-11-21 01:59:03,618 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:59:03,619 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1] [2021-11-21 01:59:03,620 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:59:03,626 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:59:03,626 INFO L85 PathProgramCache]: Analyzing trace with hash 155056323, now seen corresponding path program 1 times [2021-11-21 01:59:03,636 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:59:03,638 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1754289811] [2021-11-21 01:59:03,638 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:59:03,639 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:59:03,771 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:59:03,874 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:59:03,875 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:59:03,875 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1754289811] [2021-11-21 01:59:03,876 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1754289811] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 01:59:03,876 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 01:59:03,876 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-21 01:59:03,878 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1051232429] [2021-11-21 01:59:03,879 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:59:03,883 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-21 01:59:03,883 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:59:03,921 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-21 01:59:03,923 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-21 01:59:03,925 INFO L87 Difference]: Start difference. First operand has 22 states, 20 states have (on average 1.7) internal successors, (34), 21 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 3 states, 3 states have (on average 1.6666666666666667) internal successors, (5), 2 states have internal predecessors, (5), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:59:04,030 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:59:04,030 INFO L93 Difference]: Finished difference Result 59 states and 93 transitions. [2021-11-21 01:59:04,031 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-21 01:59:04,033 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 1.6666666666666667) internal successors, (5), 2 states have internal predecessors, (5), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 5 [2021-11-21 01:59:04,034 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:59:04,042 INFO L225 Difference]: With dead ends: 59 [2021-11-21 01:59:04,042 INFO L226 Difference]: Without dead ends: 34 [2021-11-21 01:59:04,045 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-21 01:59:04,053 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 23 mSDsluCounter, 23 mSDsCounter, 0 mSdLazyCounter, 22 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 23 SdHoareTripleChecker+Valid, 40 SdHoareTripleChecker+Invalid, 24 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 22 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 01:59:04,056 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [23 Valid, 40 Invalid, 24 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 22 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 01:59:04,073 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2021-11-21 01:59:04,091 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 21. [2021-11-21 01:59:04,093 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21 states, 20 states have (on average 1.4) internal successors, (28), 20 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:59:04,095 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 28 transitions. [2021-11-21 01:59:04,096 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 28 transitions. Word has length 5 [2021-11-21 01:59:04,096 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:59:04,096 INFO L470 AbstractCegarLoop]: Abstraction has 21 states and 28 transitions. [2021-11-21 01:59:04,097 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 1.6666666666666667) internal successors, (5), 2 states have internal predecessors, (5), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:59:04,097 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 28 transitions. [2021-11-21 01:59:04,098 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2021-11-21 01:59:04,098 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:59:04,098 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:59:04,099 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-21 01:59:04,100 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:59:04,101 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:59:04,101 INFO L85 PathProgramCache]: Analyzing trace with hash -1526546639, now seen corresponding path program 1 times [2021-11-21 01:59:04,101 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:59:04,102 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1881527110] [2021-11-21 01:59:04,103 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:59:04,103 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:59:04,136 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:59:04,198 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-21 01:59:04,199 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:59:04,199 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1881527110] [2021-11-21 01:59:04,200 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1881527110] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:59:04,200 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1308367807] [2021-11-21 01:59:04,200 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:59:04,201 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:59:04,201 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2289cc5-6a5a-45e8-9837-8c6d2aaeb177/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:59:04,203 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2289cc5-6a5a-45e8-9837-8c6d2aaeb177/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:59:04,221 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2289cc5-6a5a-45e8-9837-8c6d2aaeb177/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-21 01:59:04,263 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:59:04,265 INFO L263 TraceCheckSpWp]: Trace formula consists of 71 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-21 01:59:04,270 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:59:04,325 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-21 01:59:04,326 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:59:04,366 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-21 01:59:04,367 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1308367807] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:59:04,367 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1642751483] [2021-11-21 01:59:04,386 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2021-11-21 01:59:04,386 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:59:04,391 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:59:04,397 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:59:04,397 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:59:04,496 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:59:04,498 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:59:04,501 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:59:04,502 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:59:04,550 INFO L354 Elim1Store]: treesize reduction 60, result has 24.1 percent of original size [2021-11-21 01:59:04,551 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 39 treesize of output 53 [2021-11-21 01:59:04,611 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:59:04,612 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:59:04,614 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 7 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 27 [2021-11-21 01:59:04,713 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:59:04,722 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 4 new quantified variables, introduced 0 case distinctions, treesize of input 70 treesize of output 88 [2021-11-21 01:59:04,871 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:59:04,876 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 3 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 45 treesize of output 26 [2021-11-21 01:59:05,130 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:59:05,132 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 3 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 101 treesize of output 51 [2021-11-21 01:59:05,366 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 56 treesize of output 54 [2021-11-21 01:59:05,444 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 14 [2021-11-21 01:59:05,548 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 83 treesize of output 41 [2021-11-21 01:59:06,689 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:59:06,947 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:59:06,947 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:59:06,947 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3, 3] total 6 [2021-11-21 01:59:06,948 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [396976015] [2021-11-21 01:59:06,948 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:59:06,949 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-21 01:59:06,949 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:59:06,950 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-21 01:59:06,951 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=45, Invalid=111, Unknown=0, NotChecked=0, Total=156 [2021-11-21 01:59:06,951 INFO L87 Difference]: Start difference. First operand 21 states and 28 transitions. Second operand has 7 states, 7 states have (on average 2.142857142857143) internal successors, (15), 6 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:59:07,036 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:59:07,037 INFO L93 Difference]: Finished difference Result 84 states and 121 transitions. [2021-11-21 01:59:07,037 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-21 01:59:07,037 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 2.142857142857143) internal successors, (15), 6 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 10 [2021-11-21 01:59:07,038 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:59:07,039 INFO L225 Difference]: With dead ends: 84 [2021-11-21 01:59:07,039 INFO L226 Difference]: Without dead ends: 66 [2021-11-21 01:59:07,040 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 18 SyntacticMatches, 2 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 61 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=45, Invalid=111, Unknown=0, NotChecked=0, Total=156 [2021-11-21 01:59:07,041 INFO L933 BasicCegarLoop]: 15 mSDtfsCounter, 95 mSDsluCounter, 66 mSDsCounter, 0 mSdLazyCounter, 48 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 95 SdHoareTripleChecker+Valid, 73 SdHoareTripleChecker+Invalid, 60 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 48 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 01:59:07,042 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [95 Valid, 73 Invalid, 60 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 48 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 01:59:07,043 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2021-11-21 01:59:07,050 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 66. [2021-11-21 01:59:07,051 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 66 states, 65 states have (on average 1.4) internal successors, (91), 65 states have internal predecessors, (91), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:59:07,053 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 91 transitions. [2021-11-21 01:59:07,054 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 91 transitions. Word has length 10 [2021-11-21 01:59:07,054 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:59:07,054 INFO L470 AbstractCegarLoop]: Abstraction has 66 states and 91 transitions. [2021-11-21 01:59:07,054 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 2.142857142857143) internal successors, (15), 6 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:59:07,055 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 91 transitions. [2021-11-21 01:59:07,056 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2021-11-21 01:59:07,056 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:59:07,056 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 1, 1, 1, 1, 1] [2021-11-21 01:59:07,081 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2289cc5-6a5a-45e8-9837-8c6d2aaeb177/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-21 01:59:07,261 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2289cc5-6a5a-45e8-9837-8c6d2aaeb177/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1 [2021-11-21 01:59:07,262 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:59:07,262 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:59:07,262 INFO L85 PathProgramCache]: Analyzing trace with hash 106849547, now seen corresponding path program 2 times [2021-11-21 01:59:07,262 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:59:07,263 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [26772823] [2021-11-21 01:59:07,263 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:59:07,263 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:59:07,301 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:59:07,350 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 31 trivial. 0 not checked. [2021-11-21 01:59:07,350 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:59:07,350 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [26772823] [2021-11-21 01:59:07,350 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [26772823] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 01:59:07,351 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 01:59:07,351 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-21 01:59:07,351 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1045784744] [2021-11-21 01:59:07,351 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:59:07,352 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-21 01:59:07,352 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:59:07,352 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-21 01:59:07,353 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-21 01:59:07,353 INFO L87 Difference]: Start difference. First operand 66 states and 91 transitions. Second operand has 4 states, 4 states have (on average 3.0) internal successors, (12), 4 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:59:07,391 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:59:07,391 INFO L93 Difference]: Finished difference Result 123 states and 172 transitions. [2021-11-21 01:59:07,391 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-21 01:59:07,392 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 3.0) internal successors, (12), 4 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 25 [2021-11-21 01:59:07,392 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:59:07,394 INFO L225 Difference]: With dead ends: 123 [2021-11-21 01:59:07,394 INFO L226 Difference]: Without dead ends: 120 [2021-11-21 01:59:07,395 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-21 01:59:07,396 INFO L933 BasicCegarLoop]: 20 mSDtfsCounter, 18 mSDsluCounter, 44 mSDsCounter, 0 mSdLazyCounter, 28 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 18 SdHoareTripleChecker+Valid, 55 SdHoareTripleChecker+Invalid, 28 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 28 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-21 01:59:07,397 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [18 Valid, 55 Invalid, 28 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 28 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-21 01:59:07,398 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 120 states. [2021-11-21 01:59:07,407 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 120 to 67. [2021-11-21 01:59:07,408 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 67 states, 66 states have (on average 1.4090909090909092) internal successors, (93), 66 states have internal predecessors, (93), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:59:07,409 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 93 transitions. [2021-11-21 01:59:07,409 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 93 transitions. Word has length 25 [2021-11-21 01:59:07,410 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:59:07,410 INFO L470 AbstractCegarLoop]: Abstraction has 67 states and 93 transitions. [2021-11-21 01:59:07,410 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 3.0) internal successors, (12), 4 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:59:07,410 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 93 transitions. [2021-11-21 01:59:07,411 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-11-21 01:59:07,411 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:59:07,412 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:59:07,412 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-11-21 01:59:07,412 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:59:07,412 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:59:07,412 INFO L85 PathProgramCache]: Analyzing trace with hash -2138311154, now seen corresponding path program 1 times [2021-11-21 01:59:07,413 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:59:07,413 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [71429151] [2021-11-21 01:59:07,413 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:59:07,413 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:59:07,446 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:59:07,495 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-11-21 01:59:07,495 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:59:07,495 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [71429151] [2021-11-21 01:59:07,495 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [71429151] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:59:07,496 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1708306650] [2021-11-21 01:59:07,496 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:59:07,496 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:59:07,496 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2289cc5-6a5a-45e8-9837-8c6d2aaeb177/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:59:07,497 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2289cc5-6a5a-45e8-9837-8c6d2aaeb177/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:59:07,511 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2289cc5-6a5a-45e8-9837-8c6d2aaeb177/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-21 01:59:07,568 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:59:07,569 INFO L263 TraceCheckSpWp]: Trace formula consists of 164 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-21 01:59:07,572 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:59:07,678 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-11-21 01:59:07,679 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:59:07,781 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-11-21 01:59:07,783 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1708306650] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:59:07,783 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1843663867] [2021-11-21 01:59:07,793 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2021-11-21 01:59:07,793 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:59:07,793 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:59:07,793 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:59:07,794 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:59:07,828 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:59:07,830 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:59:07,832 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:59:07,833 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:59:07,864 INFO L354 Elim1Store]: treesize reduction 60, result has 24.1 percent of original size [2021-11-21 01:59:07,865 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 39 treesize of output 53 [2021-11-21 01:59:07,895 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:59:07,896 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:59:07,903 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 7 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 27 [2021-11-21 01:59:08,002 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:59:08,007 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 4 new quantified variables, introduced 0 case distinctions, treesize of input 64 treesize of output 82 [2021-11-21 01:59:08,124 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:59:08,125 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 41 treesize of output 25 [2021-11-21 01:59:08,192 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:59:08,195 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 80 treesize of output 48 [2021-11-21 01:59:08,373 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 56 treesize of output 54 [2021-11-21 01:59:08,425 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 14 [2021-11-21 01:59:08,477 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 83 treesize of output 41 [2021-11-21 01:59:08,757 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 20 treesize of output 16 [2021-11-21 01:59:09,150 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 27 treesize of output 19 [2021-11-21 01:59:09,628 INFO L354 Elim1Store]: treesize reduction 31, result has 3.1 percent of original size [2021-11-21 01:59:09,629 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 80 treesize of output 68 [2021-11-21 01:59:10,250 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 20 treesize of output 16 [2021-11-21 01:59:11,164 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 20 treesize of output 16 [2021-11-21 01:59:11,537 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 27 treesize of output 19 [2021-11-21 01:59:12,104 INFO L354 Elim1Store]: treesize reduction 31, result has 3.1 percent of original size [2021-11-21 01:59:12,105 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 86 treesize of output 74 [2021-11-21 01:59:12,721 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 20 treesize of output 16 [2021-11-21 01:59:13,703 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 20 treesize of output 16 [2021-11-21 01:59:14,136 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 29 treesize of output 21 [2021-11-21 01:59:14,605 INFO L354 Elim1Store]: treesize reduction 31, result has 3.1 percent of original size [2021-11-21 01:59:14,606 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 86 treesize of output 74 [2021-11-21 01:59:15,200 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 20 treesize of output 16 [2021-11-21 01:59:16,064 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 20 treesize of output 16 [2021-11-21 01:59:16,289 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:59:17,069 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:59:17,070 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:59:17,070 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 12 [2021-11-21 01:59:17,070 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2127498843] [2021-11-21 01:59:17,070 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:59:17,071 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2021-11-21 01:59:17,071 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:59:17,072 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-11-21 01:59:17,072 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=109, Invalid=353, Unknown=0, NotChecked=0, Total=462 [2021-11-21 01:59:17,072 INFO L87 Difference]: Start difference. First operand 67 states and 93 transitions. Second operand has 13 states, 13 states have (on average 1.9230769230769231) internal successors, (25), 12 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:59:17,308 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:59:17,309 INFO L93 Difference]: Finished difference Result 231 states and 336 transitions. [2021-11-21 01:59:17,309 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-21 01:59:17,309 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 1.9230769230769231) internal successors, (25), 12 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 29 [2021-11-21 01:59:17,310 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:59:17,312 INFO L225 Difference]: With dead ends: 231 [2021-11-21 01:59:17,313 INFO L226 Difference]: Without dead ends: 170 [2021-11-21 01:59:17,314 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 91 GetRequests, 66 SyntacticMatches, 5 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 265 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=109, Invalid=353, Unknown=0, NotChecked=0, Total=462 [2021-11-21 01:59:17,315 INFO L933 BasicCegarLoop]: 15 mSDtfsCounter, 342 mSDsluCounter, 158 mSDsCounter, 0 mSdLazyCounter, 97 mSolverCounterSat, 32 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 342 SdHoareTripleChecker+Valid, 153 SdHoareTripleChecker+Invalid, 129 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 32 IncrementalHoareTripleChecker+Valid, 97 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-21 01:59:17,316 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [342 Valid, 153 Invalid, 129 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [32 Valid, 97 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-21 01:59:17,317 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 170 states. [2021-11-21 01:59:17,332 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 170 to 157. [2021-11-21 01:59:17,333 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 157 states, 156 states have (on average 1.4038461538461537) internal successors, (219), 156 states have internal predecessors, (219), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:59:17,336 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 157 states to 157 states and 219 transitions. [2021-11-21 01:59:17,336 INFO L78 Accepts]: Start accepts. Automaton has 157 states and 219 transitions. Word has length 29 [2021-11-21 01:59:17,336 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:59:17,336 INFO L470 AbstractCegarLoop]: Abstraction has 157 states and 219 transitions. [2021-11-21 01:59:17,337 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 1.9230769230769231) internal successors, (25), 12 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:59:17,337 INFO L276 IsEmpty]: Start isEmpty. Operand 157 states and 219 transitions. [2021-11-21 01:59:17,339 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2021-11-21 01:59:17,340 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:59:17,340 INFO L514 BasicCegarLoop]: trace histogram [10, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:59:17,380 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2289cc5-6a5a-45e8-9837-8c6d2aaeb177/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-21 01:59:17,562 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2289cc5-6a5a-45e8-9837-8c6d2aaeb177/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:59:17,562 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:59:17,563 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:59:17,563 INFO L85 PathProgramCache]: Analyzing trace with hash -322976646, now seen corresponding path program 2 times [2021-11-21 01:59:17,563 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:59:17,563 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [733923191] [2021-11-21 01:59:17,564 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:59:17,564 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:59:17,650 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:59:17,807 INFO L134 CoverageAnalysis]: Checked inductivity of 255 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 200 trivial. 0 not checked. [2021-11-21 01:59:17,807 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:59:17,807 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [733923191] [2021-11-21 01:59:17,807 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [733923191] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:59:17,807 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1760222213] [2021-11-21 01:59:17,808 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 01:59:17,808 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:59:17,808 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2289cc5-6a5a-45e8-9837-8c6d2aaeb177/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:59:17,809 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2289cc5-6a5a-45e8-9837-8c6d2aaeb177/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:59:17,821 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2289cc5-6a5a-45e8-9837-8c6d2aaeb177/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-21 01:59:17,889 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-11-21 01:59:17,889 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:59:17,890 INFO L263 TraceCheckSpWp]: Trace formula consists of 130 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-21 01:59:17,893 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:59:18,069 INFO L134 CoverageAnalysis]: Checked inductivity of 255 backedges. 28 proven. 1 refuted. 0 times theorem prover too weak. 226 trivial. 0 not checked. [2021-11-21 01:59:18,069 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:59:18,312 INFO L134 CoverageAnalysis]: Checked inductivity of 255 backedges. 28 proven. 1 refuted. 0 times theorem prover too weak. 226 trivial. 0 not checked. [2021-11-21 01:59:18,313 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1760222213] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:59:18,313 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1986986887] [2021-11-21 01:59:18,315 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2021-11-21 01:59:18,316 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:59:18,336 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:59:18,337 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:59:18,337 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:59:18,364 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:59:18,365 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:59:18,398 INFO L354 Elim1Store]: treesize reduction 33, result has 40.0 percent of original size [2021-11-21 01:59:18,399 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 38 [2021-11-21 01:59:18,445 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:59:18,447 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:59:18,449 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:59:18,450 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:59:18,483 INFO L354 Elim1Store]: treesize reduction 60, result has 24.1 percent of original size [2021-11-21 01:59:18,483 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 39 treesize of output 53 [2021-11-21 01:59:18,538 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:59:18,539 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 4 new quantified variables, introduced 0 case distinctions, treesize of input 64 treesize of output 82 [2021-11-21 01:59:18,612 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:59:18,613 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 3 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 41 treesize of output 25 [2021-11-21 01:59:18,697 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:59:18,698 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 3 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 80 treesize of output 48 [2021-11-21 01:59:18,885 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 56 treesize of output 54 [2021-11-21 01:59:18,918 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 12 [2021-11-21 01:59:18,978 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 83 treesize of output 41 [2021-11-21 01:59:19,290 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 20 treesize of output 16 [2021-11-21 01:59:19,720 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 27 treesize of output 19 [2021-11-21 01:59:20,280 INFO L354 Elim1Store]: treesize reduction 31, result has 3.1 percent of original size [2021-11-21 01:59:20,281 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 80 treesize of output 68 [2021-11-21 01:59:20,752 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 20 treesize of output 16 [2021-11-21 01:59:21,562 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 20 treesize of output 16 [2021-11-21 01:59:21,924 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 27 treesize of output 19 [2021-11-21 01:59:22,336 INFO L354 Elim1Store]: treesize reduction 31, result has 3.1 percent of original size [2021-11-21 01:59:22,337 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 86 treesize of output 74 [2021-11-21 01:59:23,013 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 20 treesize of output 16 [2021-11-21 01:59:23,863 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 20 treesize of output 16 [2021-11-21 01:59:24,201 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 27 treesize of output 19 [2021-11-21 01:59:24,705 INFO L354 Elim1Store]: treesize reduction 31, result has 3.1 percent of original size [2021-11-21 01:59:24,706 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 86 treesize of output 74 [2021-11-21 01:59:25,327 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 20 treesize of output 16 [2021-11-21 01:59:25,627 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 20 treesize of output 16 [2021-11-21 01:59:26,071 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:59:27,143 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:59:27,143 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:59:27,143 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 6, 6] total 20 [2021-11-21 01:59:27,143 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1164021400] [2021-11-21 01:59:27,143 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:59:27,144 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2021-11-21 01:59:27,145 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:59:27,145 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-11-21 01:59:27,146 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=132, Invalid=680, Unknown=0, NotChecked=0, Total=812 [2021-11-21 01:59:27,146 INFO L87 Difference]: Start difference. First operand 157 states and 219 transitions. Second operand has 20 states, 20 states have (on average 2.25) internal successors, (45), 20 states have internal predecessors, (45), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:59:29,342 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:59:29,342 INFO L93 Difference]: Finished difference Result 850 states and 1220 transitions. [2021-11-21 01:59:29,342 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 86 states. [2021-11-21 01:59:29,343 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 2.25) internal successors, (45), 20 states have internal predecessors, (45), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 59 [2021-11-21 01:59:29,343 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:59:29,347 INFO L225 Difference]: With dead ends: 850 [2021-11-21 01:59:29,347 INFO L226 Difference]: Without dead ends: 702 [2021-11-21 01:59:29,353 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 291 GetRequests, 182 SyntacticMatches, 12 SemanticMatches, 97 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3511 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=2159, Invalid=7543, Unknown=0, NotChecked=0, Total=9702 [2021-11-21 01:59:29,354 INFO L933 BasicCegarLoop]: 16 mSDtfsCounter, 3738 mSDsluCounter, 228 mSDsCounter, 0 mSdLazyCounter, 186 mSolverCounterSat, 482 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3738 SdHoareTripleChecker+Valid, 223 SdHoareTripleChecker+Invalid, 668 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 482 IncrementalHoareTripleChecker+Valid, 186 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-21 01:59:29,355 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3738 Valid, 223 Invalid, 668 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [482 Valid, 186 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-21 01:59:29,357 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 702 states. [2021-11-21 01:59:29,385 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 702 to 205. [2021-11-21 01:59:29,386 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 205 states, 204 states have (on average 1.4264705882352942) internal successors, (291), 204 states have internal predecessors, (291), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:59:29,388 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 205 states to 205 states and 291 transitions. [2021-11-21 01:59:29,388 INFO L78 Accepts]: Start accepts. Automaton has 205 states and 291 transitions. Word has length 59 [2021-11-21 01:59:29,388 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:59:29,389 INFO L470 AbstractCegarLoop]: Abstraction has 205 states and 291 transitions. [2021-11-21 01:59:29,389 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 20 states have (on average 2.25) internal successors, (45), 20 states have internal predecessors, (45), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:59:29,389 INFO L276 IsEmpty]: Start isEmpty. Operand 205 states and 291 transitions. [2021-11-21 01:59:29,392 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2021-11-21 01:59:29,393 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:59:29,393 INFO L514 BasicCegarLoop]: trace histogram [11, 11, 11, 11, 11, 4, 4, 4, 4, 1, 1, 1, 1, 1] [2021-11-21 01:59:29,431 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2289cc5-6a5a-45e8-9837-8c6d2aaeb177/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-21 01:59:29,610 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2289cc5-6a5a-45e8-9837-8c6d2aaeb177/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:59:29,610 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:59:29,611 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:59:29,611 INFO L85 PathProgramCache]: Analyzing trace with hash -1548030479, now seen corresponding path program 3 times [2021-11-21 01:59:29,611 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:59:29,611 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1085658515] [2021-11-21 01:59:29,611 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:59:29,611 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:59:29,675 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:59:29,807 INFO L134 CoverageAnalysis]: Checked inductivity of 365 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 299 trivial. 0 not checked. [2021-11-21 01:59:29,807 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:59:29,808 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1085658515] [2021-11-21 01:59:29,808 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1085658515] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:59:29,808 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [789900039] [2021-11-21 01:59:29,808 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-21 01:59:29,808 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:59:29,808 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2289cc5-6a5a-45e8-9837-8c6d2aaeb177/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:59:29,813 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2289cc5-6a5a-45e8-9837-8c6d2aaeb177/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:59:29,841 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2289cc5-6a5a-45e8-9837-8c6d2aaeb177/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-21 01:59:29,915 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-21 01:59:29,915 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:59:29,917 INFO L263 TraceCheckSpWp]: Trace formula consists of 397 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-21 01:59:29,921 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:59:30,062 INFO L134 CoverageAnalysis]: Checked inductivity of 365 backedges. 0 proven. 271 refuted. 0 times theorem prover too weak. 94 trivial. 0 not checked. [2021-11-21 01:59:30,063 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:59:30,348 INFO L134 CoverageAnalysis]: Checked inductivity of 365 backedges. 0 proven. 271 refuted. 0 times theorem prover too weak. 94 trivial. 0 not checked. [2021-11-21 01:59:30,348 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [789900039] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:59:30,348 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [351535860] [2021-11-21 01:59:30,351 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2021-11-21 01:59:30,351 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:59:30,351 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:59:30,351 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:59:30,352 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:59:30,374 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:59:30,375 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:59:30,376 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:59:30,377 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:59:30,401 INFO L354 Elim1Store]: treesize reduction 60, result has 24.1 percent of original size [2021-11-21 01:59:30,401 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 39 treesize of output 53 [2021-11-21 01:59:30,429 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:59:30,430 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:59:30,433 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 7 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 27 [2021-11-21 01:59:30,477 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:59:30,493 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 4 new quantified variables, introduced 0 case distinctions, treesize of input 70 treesize of output 88 [2021-11-21 01:59:30,547 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:59:30,548 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 3 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 40 treesize of output 25 [2021-11-21 01:59:30,636 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:59:30,636 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 3 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 108 treesize of output 54 [2021-11-21 01:59:30,785 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 56 treesize of output 54 [2021-11-21 01:59:30,820 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 14 [2021-11-21 01:59:30,861 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 83 treesize of output 41 [2021-11-21 01:59:31,090 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 20 treesize of output 16 [2021-11-21 01:59:31,349 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 27 treesize of output 19 [2021-11-21 01:59:31,747 INFO L354 Elim1Store]: treesize reduction 31, result has 3.1 percent of original size [2021-11-21 01:59:31,747 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 80 treesize of output 68 [2021-11-21 01:59:32,349 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 20 treesize of output 16 [2021-11-21 01:59:33,119 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 20 treesize of output 16 [2021-11-21 01:59:33,446 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 27 treesize of output 19 [2021-11-21 01:59:33,876 INFO L354 Elim1Store]: treesize reduction 31, result has 3.1 percent of original size [2021-11-21 01:59:33,876 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 86 treesize of output 74 [2021-11-21 01:59:34,527 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 20 treesize of output 16 [2021-11-21 01:59:35,312 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 20 treesize of output 16 [2021-11-21 01:59:35,652 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 27 treesize of output 19 [2021-11-21 01:59:36,116 INFO L354 Elim1Store]: treesize reduction 31, result has 3.1 percent of original size [2021-11-21 01:59:36,116 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 86 treesize of output 74 [2021-11-21 01:59:36,692 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 20 treesize of output 16 [2021-11-21 01:59:37,212 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 20 treesize of output 16 [2021-11-21 01:59:37,374 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:59:38,458 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:59:38,458 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:59:38,458 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 14, 14] total 27 [2021-11-21 01:59:38,458 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1310704223] [2021-11-21 01:59:38,459 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:59:38,459 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2021-11-21 01:59:38,459 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:59:38,460 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2021-11-21 01:59:38,460 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=382, Invalid=878, Unknown=0, NotChecked=0, Total=1260 [2021-11-21 01:59:38,460 INFO L87 Difference]: Start difference. First operand 205 states and 291 transitions. Second operand has 27 states, 27 states have (on average 4.666666666666667) internal successors, (126), 27 states have internal predecessors, (126), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:59:38,893 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:59:38,893 INFO L93 Difference]: Finished difference Result 1048 states and 1570 transitions. [2021-11-21 01:59:38,893 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-11-21 01:59:38,894 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 27 states have (on average 4.666666666666667) internal successors, (126), 27 states have internal predecessors, (126), 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 76 [2021-11-21 01:59:38,894 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:59:38,900 INFO L225 Difference]: With dead ends: 1048 [2021-11-21 01:59:38,901 INFO L226 Difference]: Without dead ends: 856 [2021-11-21 01:59:38,906 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 239 GetRequests, 193 SyntacticMatches, 12 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 874 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=382, Invalid=878, Unknown=0, NotChecked=0, Total=1260 [2021-11-21 01:59:38,910 INFO L933 BasicCegarLoop]: 15 mSDtfsCounter, 1367 mSDsluCounter, 351 mSDsCounter, 0 mSdLazyCounter, 200 mSolverCounterSat, 106 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1367 SdHoareTripleChecker+Valid, 320 SdHoareTripleChecker+Invalid, 306 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 106 IncrementalHoareTripleChecker+Valid, 200 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-21 01:59:38,910 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1367 Valid, 320 Invalid, 306 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [106 Valid, 200 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-21 01:59:38,913 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 856 states. [2021-11-21 01:59:38,977 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 856 to 400. [2021-11-21 01:59:38,978 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 400 states, 399 states have (on average 1.413533834586466) internal successors, (564), 399 states have internal predecessors, (564), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:59:38,984 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 400 states to 400 states and 564 transitions. [2021-11-21 01:59:38,985 INFO L78 Accepts]: Start accepts. Automaton has 400 states and 564 transitions. Word has length 76 [2021-11-21 01:59:38,987 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:59:38,987 INFO L470 AbstractCegarLoop]: Abstraction has 400 states and 564 transitions. [2021-11-21 01:59:38,987 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 27 states have (on average 4.666666666666667) internal successors, (126), 27 states have internal predecessors, (126), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:59:38,987 INFO L276 IsEmpty]: Start isEmpty. Operand 400 states and 564 transitions. [2021-11-21 01:59:38,996 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 142 [2021-11-21 01:59:38,996 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:59:38,997 INFO L514 BasicCegarLoop]: trace histogram [24, 24, 24, 24, 24, 4, 4, 4, 4, 1, 1, 1, 1, 1] [2021-11-21 01:59:39,034 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2289cc5-6a5a-45e8-9837-8c6d2aaeb177/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-21 01:59:39,213 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2289cc5-6a5a-45e8-9837-8c6d2aaeb177/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:59:39,213 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:59:39,214 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:59:39,214 INFO L85 PathProgramCache]: Analyzing trace with hash -1224299137, now seen corresponding path program 4 times [2021-11-21 01:59:39,214 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:59:39,214 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1159659216] [2021-11-21 01:59:39,214 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:59:39,214 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:59:39,294 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:59:39,667 INFO L134 CoverageAnalysis]: Checked inductivity of 1548 backedges. 0 proven. 300 refuted. 0 times theorem prover too weak. 1248 trivial. 0 not checked. [2021-11-21 01:59:39,667 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:59:39,667 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1159659216] [2021-11-21 01:59:39,667 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1159659216] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:59:39,667 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [918636450] [2021-11-21 01:59:39,668 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-21 01:59:39,668 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:59:39,668 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2289cc5-6a5a-45e8-9837-8c6d2aaeb177/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:59:39,669 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2289cc5-6a5a-45e8-9837-8c6d2aaeb177/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:59:39,689 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2289cc5-6a5a-45e8-9837-8c6d2aaeb177/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-21 01:59:39,806 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:59:39,810 INFO L263 TraceCheckSpWp]: Trace formula consists of 696 conjuncts, 26 conjunts are in the unsatisfiable core [2021-11-21 01:59:39,816 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:59:40,138 INFO L134 CoverageAnalysis]: Checked inductivity of 1548 backedges. 0 proven. 300 refuted. 0 times theorem prover too weak. 1248 trivial. 0 not checked. [2021-11-21 01:59:40,138 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:59:41,195 INFO L134 CoverageAnalysis]: Checked inductivity of 1548 backedges. 0 proven. 300 refuted. 0 times theorem prover too weak. 1248 trivial. 0 not checked. [2021-11-21 01:59:41,196 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [918636450] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:59:41,196 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [384430469] [2021-11-21 01:59:41,198 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2021-11-21 01:59:41,198 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:59:41,199 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:59:41,199 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:59:41,199 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:59:41,227 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:59:41,228 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:59:41,230 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:59:41,231 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:59:41,263 INFO L354 Elim1Store]: treesize reduction 60, result has 24.1 percent of original size [2021-11-21 01:59:41,264 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 39 treesize of output 53 [2021-11-21 01:59:41,291 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:59:41,292 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:59:41,293 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 7 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 27 [2021-11-21 01:59:41,380 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:59:41,382 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 4 new quantified variables, introduced 0 case distinctions, treesize of input 70 treesize of output 88 [2021-11-21 01:59:41,411 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:59:41,421 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 40 treesize of output 25 [2021-11-21 01:59:41,510 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:59:41,511 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 108 treesize of output 54 [2021-11-21 01:59:41,609 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 56 treesize of output 54 [2021-11-21 01:59:41,637 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 12 [2021-11-21 01:59:41,677 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 83 treesize of output 41 [2021-11-21 01:59:41,925 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 20 treesize of output 16 [2021-11-21 01:59:42,208 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 27 treesize of output 19 [2021-11-21 01:59:42,567 INFO L354 Elim1Store]: treesize reduction 31, result has 3.1 percent of original size [2021-11-21 01:59:42,568 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 80 treesize of output 68 [2021-11-21 01:59:42,993 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 20 treesize of output 16 [2021-11-21 01:59:43,723 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 20 treesize of output 16 [2021-11-21 01:59:44,117 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 27 treesize of output 19 [2021-11-21 01:59:44,686 INFO L354 Elim1Store]: treesize reduction 31, result has 3.1 percent of original size [2021-11-21 01:59:44,687 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 86 treesize of output 74 [2021-11-21 01:59:45,105 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 20 treesize of output 16 [2021-11-21 01:59:45,985 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 20 treesize of output 16 [2021-11-21 01:59:46,361 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 27 treesize of output 19 [2021-11-21 01:59:46,959 INFO L354 Elim1Store]: treesize reduction 31, result has 3.1 percent of original size [2021-11-21 01:59:46,959 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 86 treesize of output 74 [2021-11-21 01:59:47,418 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 20 treesize of output 16 [2021-11-21 01:59:48,039 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 20 treesize of output 16 [2021-11-21 01:59:48,236 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:59:49,319 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:59:49,320 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:59:49,320 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26, 26] total 52 [2021-11-21 01:59:49,320 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [135010683] [2021-11-21 01:59:49,320 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:59:49,321 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 53 states [2021-11-21 01:59:49,321 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:59:49,322 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2021-11-21 01:59:49,323 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1409, Invalid=2373, Unknown=0, NotChecked=0, Total=3782 [2021-11-21 01:59:49,324 INFO L87 Difference]: Start difference. First operand 400 states and 564 transitions. Second operand has 53 states, 53 states have (on average 1.2264150943396226) internal successors, (65), 52 states have internal predecessors, (65), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:59:50,626 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:59:50,626 INFO L93 Difference]: Finished difference Result 2075 states and 3104 transitions. [2021-11-21 01:59:50,626 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2021-11-21 01:59:50,627 INFO L78 Accepts]: Start accepts. Automaton has has 53 states, 53 states have (on average 1.2264150943396226) internal successors, (65), 52 states have internal predecessors, (65), 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 141 [2021-11-21 01:59:50,627 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:59:50,641 INFO L225 Difference]: With dead ends: 2075 [2021-11-21 01:59:50,641 INFO L226 Difference]: Without dead ends: 1701 [2021-11-21 01:59:50,644 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 447 GetRequests, 362 SyntacticMatches, 25 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2785 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=1409, Invalid=2373, Unknown=0, NotChecked=0, Total=3782 [2021-11-21 01:59:50,645 INFO L933 BasicCegarLoop]: 15 mSDtfsCounter, 3097 mSDsluCounter, 762 mSDsCounter, 0 mSdLazyCounter, 419 mSolverCounterSat, 221 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3097 SdHoareTripleChecker+Valid, 677 SdHoareTripleChecker+Invalid, 640 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 221 IncrementalHoareTripleChecker+Valid, 419 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-21 01:59:50,646 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3097 Valid, 677 Invalid, 640 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [221 Valid, 419 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-21 01:59:50,650 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1701 states. [2021-11-21 01:59:50,726 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1701 to 790. [2021-11-21 01:59:50,728 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 790 states, 789 states have (on average 1.4068441064638784) internal successors, (1110), 789 states have internal predecessors, (1110), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:59:50,731 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 790 states to 790 states and 1110 transitions. [2021-11-21 01:59:50,732 INFO L78 Accepts]: Start accepts. Automaton has 790 states and 1110 transitions. Word has length 141 [2021-11-21 01:59:50,732 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:59:50,732 INFO L470 AbstractCegarLoop]: Abstraction has 790 states and 1110 transitions. [2021-11-21 01:59:50,732 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 53 states, 53 states have (on average 1.2264150943396226) internal successors, (65), 52 states have internal predecessors, (65), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:59:50,733 INFO L276 IsEmpty]: Start isEmpty. Operand 790 states and 1110 transitions. [2021-11-21 01:59:50,743 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 272 [2021-11-21 01:59:50,743 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:59:50,743 INFO L514 BasicCegarLoop]: trace histogram [50, 50, 50, 50, 50, 4, 4, 4, 4, 1, 1, 1, 1, 1] [2021-11-21 01:59:50,782 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2289cc5-6a5a-45e8-9837-8c6d2aaeb177/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-21 01:59:50,965 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2289cc5-6a5a-45e8-9837-8c6d2aaeb177/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2021-11-21 01:59:50,965 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:59:50,966 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:59:50,966 INFO L85 PathProgramCache]: Analyzing trace with hash 1747851091, now seen corresponding path program 5 times [2021-11-21 01:59:50,966 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:59:50,966 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [782615033] [2021-11-21 01:59:50,966 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:59:50,966 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:59:51,181 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:59:52,416 INFO L134 CoverageAnalysis]: Checked inductivity of 6449 backedges. 0 proven. 1275 refuted. 0 times theorem prover too weak. 5174 trivial. 0 not checked. [2021-11-21 01:59:52,417 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:59:52,417 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [782615033] [2021-11-21 01:59:52,417 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [782615033] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:59:52,417 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2144219942] [2021-11-21 01:59:52,417 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 01:59:52,417 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:59:52,417 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2289cc5-6a5a-45e8-9837-8c6d2aaeb177/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:59:52,418 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2289cc5-6a5a-45e8-9837-8c6d2aaeb177/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:59:52,419 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2289cc5-6a5a-45e8-9837-8c6d2aaeb177/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-21 01:59:52,582 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2021-11-21 01:59:52,582 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:59:52,584 INFO L263 TraceCheckSpWp]: Trace formula consists of 289 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-21 01:59:52,592 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:59:53,186 INFO L134 CoverageAnalysis]: Checked inductivity of 6449 backedges. 295 proven. 28 refuted. 0 times theorem prover too weak. 6126 trivial. 0 not checked. [2021-11-21 01:59:53,187 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:59:53,984 INFO L134 CoverageAnalysis]: Checked inductivity of 6449 backedges. 295 proven. 28 refuted. 0 times theorem prover too weak. 6126 trivial. 0 not checked. [2021-11-21 01:59:53,984 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2144219942] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:59:53,984 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1351507630] [2021-11-21 01:59:53,987 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2021-11-21 01:59:53,988 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:59:53,988 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:59:53,988 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:59:53,988 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:59:54,026 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:59:54,028 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:59:54,030 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:59:54,031 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:59:54,071 INFO L354 Elim1Store]: treesize reduction 60, result has 24.1 percent of original size [2021-11-21 01:59:54,071 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 39 treesize of output 53 [2021-11-21 01:59:54,093 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:59:54,096 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:59:54,096 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 7 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 27 [2021-11-21 01:59:54,156 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:59:54,157 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 4 new quantified variables, introduced 0 case distinctions, treesize of input 64 treesize of output 82 [2021-11-21 01:59:54,203 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:59:54,204 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 3 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 45 treesize of output 29 [2021-11-21 01:59:54,300 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:59:54,301 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 3 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 91 treesize of output 55 [2021-11-21 01:59:54,462 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 56 treesize of output 54 [2021-11-21 01:59:54,494 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 14 [2021-11-21 01:59:54,545 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 83 treesize of output 41 [2021-11-21 01:59:54,784 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 20 treesize of output 16 [2021-11-21 01:59:55,068 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 27 treesize of output 19 [2021-11-21 01:59:55,497 INFO L354 Elim1Store]: treesize reduction 31, result has 3.1 percent of original size [2021-11-21 01:59:55,498 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 80 treesize of output 68 [2021-11-21 01:59:56,044 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 20 treesize of output 16 [2021-11-21 01:59:56,770 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 20 treesize of output 16 [2021-11-21 01:59:57,230 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 27 treesize of output 19 [2021-11-21 01:59:57,695 INFO L354 Elim1Store]: treesize reduction 31, result has 3.1 percent of original size [2021-11-21 01:59:57,695 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 86 treesize of output 74 [2021-11-21 01:59:58,126 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 20 treesize of output 16 [2021-11-21 01:59:59,004 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 20 treesize of output 16 [2021-11-21 01:59:59,430 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 27 treesize of output 19 [2021-11-21 01:59:59,956 INFO L354 Elim1Store]: treesize reduction 31, result has 3.1 percent of original size [2021-11-21 01:59:59,957 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 86 treesize of output 74 [2021-11-21 02:00:00,358 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 20 treesize of output 16 [2021-11-21 02:00:00,693 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 20 treesize of output 16 [2021-11-21 02:00:01,201 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 02:00:04,026 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 02:00:04,026 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 02:00:04,027 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [52, 9, 9] total 66 [2021-11-21 02:00:04,027 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [59580030] [2021-11-21 02:00:04,027 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 02:00:04,028 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 66 states [2021-11-21 02:00:04,028 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 02:00:04,028 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 66 interpolants. [2021-11-21 02:00:04,030 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1483, Invalid=4067, Unknown=0, NotChecked=0, Total=5550 [2021-11-21 02:00:04,030 INFO L87 Difference]: Start difference. First operand 790 states and 1110 transitions. Second operand has 66 states, 66 states have (on average 1.6515151515151516) internal successors, (109), 66 states have internal predecessors, (109), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 02:01:44,053 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 02:01:44,053 INFO L93 Difference]: Finished difference Result 7850 states and 11356 transitions. [2021-11-21 02:01:44,054 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 834 states. [2021-11-21 02:01:44,054 INFO L78 Accepts]: Start accepts. Automaton has has 66 states, 66 states have (on average 1.6515151515151516) internal successors, (109), 66 states have internal predecessors, (109), 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 271 [2021-11-21 02:01:44,054 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 02:01:44,095 INFO L225 Difference]: With dead ends: 7850 [2021-11-21 02:01:44,095 INFO L226 Difference]: Without dead ends: 7106 [2021-11-21 02:01:44,149 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1945 GetRequests, 1045 SyntacticMatches, 52 SemanticMatches, 848 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 333252 ImplicationChecksByTransitivity, 77.0s TimeCoverageRelationStatistics Valid=169261, Invalid=552389, Unknown=0, NotChecked=0, Total=721650 [2021-11-21 02:01:44,149 INFO L933 BasicCegarLoop]: 16 mSDtfsCounter, 49899 mSDsluCounter, 831 mSDsCounter, 0 mSdLazyCounter, 617 mSolverCounterSat, 5932 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 49899 SdHoareTripleChecker+Valid, 777 SdHoareTripleChecker+Invalid, 6549 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 5932 IncrementalHoareTripleChecker+Valid, 617 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.1s IncrementalHoareTripleChecker+Time [2021-11-21 02:01:44,150 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [49899 Valid, 777 Invalid, 6549 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [5932 Valid, 617 Invalid, 0 Unknown, 0 Unchecked, 3.1s Time] [2021-11-21 02:01:44,157 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 7106 states. [2021-11-21 02:01:44,309 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 7106 to 871. [2021-11-21 02:01:44,311 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 871 states, 870 states have (on average 1.4172413793103449) internal successors, (1233), 870 states have internal predecessors, (1233), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 02:01:44,312 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 871 states to 871 states and 1233 transitions. [2021-11-21 02:01:44,313 INFO L78 Accepts]: Start accepts. Automaton has 871 states and 1233 transitions. Word has length 271 [2021-11-21 02:01:44,313 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 02:01:44,313 INFO L470 AbstractCegarLoop]: Abstraction has 871 states and 1233 transitions. [2021-11-21 02:01:44,313 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 66 states, 66 states have (on average 1.6515151515151516) internal successors, (109), 66 states have internal predecessors, (109), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 02:01:44,314 INFO L276 IsEmpty]: Start isEmpty. Operand 871 states and 1233 transitions. [2021-11-21 02:01:44,319 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 301 [2021-11-21 02:01:44,319 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 02:01:44,320 INFO L514 BasicCegarLoop]: trace histogram [51, 51, 51, 51, 51, 10, 10, 10, 10, 1, 1, 1, 1, 1] [2021-11-21 02:01:44,353 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2289cc5-6a5a-45e8-9837-8c6d2aaeb177/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-21 02:01:44,533 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2289cc5-6a5a-45e8-9837-8c6d2aaeb177/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable7 [2021-11-21 02:01:44,533 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 02:01:44,534 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 02:01:44,534 INFO L85 PathProgramCache]: Analyzing trace with hash -957412781, now seen corresponding path program 6 times [2021-11-21 02:01:44,534 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 02:01:44,534 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1272259746] [2021-11-21 02:01:44,535 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 02:01:44,535 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 02:01:44,637 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 02:01:45,667 INFO L134 CoverageAnalysis]: Checked inductivity of 7167 backedges. 0 proven. 1326 refuted. 0 times theorem prover too weak. 5841 trivial. 0 not checked. [2021-11-21 02:01:45,667 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 02:01:45,667 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1272259746] [2021-11-21 02:01:45,667 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1272259746] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 02:01:45,667 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1508481367] [2021-11-21 02:01:45,667 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-21 02:01:45,667 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 02:01:45,668 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2289cc5-6a5a-45e8-9837-8c6d2aaeb177/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 02:01:45,668 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2289cc5-6a5a-45e8-9837-8c6d2aaeb177/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 02:01:45,669 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2289cc5-6a5a-45e8-9837-8c6d2aaeb177/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-21 02:01:45,860 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-21 02:01:45,861 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 02:01:45,867 INFO L263 TraceCheckSpWp]: Trace formula consists of 1461 conjuncts, 53 conjunts are in the unsatisfiable core [2021-11-21 02:01:45,875 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 02:01:46,392 INFO L134 CoverageAnalysis]: Checked inductivity of 7167 backedges. 0 proven. 5651 refuted. 0 times theorem prover too weak. 1516 trivial. 0 not checked. [2021-11-21 02:01:46,392 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 02:01:49,432 INFO L134 CoverageAnalysis]: Checked inductivity of 7167 backedges. 0 proven. 5651 refuted. 0 times theorem prover too weak. 1516 trivial. 0 not checked. [2021-11-21 02:01:49,432 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1508481367] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 02:01:49,432 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2009329228] [2021-11-21 02:01:49,434 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2021-11-21 02:01:49,434 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 02:01:49,435 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 02:01:49,435 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 02:01:49,435 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 02:01:49,455 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 02:01:49,456 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 02:01:49,476 INFO L354 Elim1Store]: treesize reduction 33, result has 40.0 percent of original size [2021-11-21 02:01:49,477 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 38 [2021-11-21 02:01:49,514 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 02:01:49,515 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 02:01:49,517 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 02:01:49,517 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 02:01:49,541 INFO L354 Elim1Store]: treesize reduction 60, result has 24.1 percent of original size [2021-11-21 02:01:49,542 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 39 treesize of output 53 [2021-11-21 02:01:49,615 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 02:01:49,616 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 4 new quantified variables, introduced 0 case distinctions, treesize of input 70 treesize of output 88 [2021-11-21 02:01:49,675 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 02:01:49,678 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 51 treesize of output 32 [2021-11-21 02:01:49,724 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 02:01:49,724 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 112 treesize of output 58 [2021-11-21 02:01:49,999 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 56 treesize of output 54 [2021-11-21 02:01:50,017 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 14 [2021-11-21 02:01:50,086 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 83 treesize of output 41 [2021-11-21 02:01:50,370 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 20 treesize of output 16 [2021-11-21 02:01:50,661 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 27 treesize of output 19 [2021-11-21 02:01:51,145 INFO L354 Elim1Store]: treesize reduction 31, result has 3.1 percent of original size [2021-11-21 02:01:51,146 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 80 treesize of output 68 [2021-11-21 02:01:51,675 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 20 treesize of output 16 [2021-11-21 02:01:52,658 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 20 treesize of output 16 [2021-11-21 02:01:53,229 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 27 treesize of output 19 [2021-11-21 02:01:54,005 INFO L354 Elim1Store]: treesize reduction 31, result has 3.1 percent of original size [2021-11-21 02:01:54,006 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 86 treesize of output 74 [2021-11-21 02:01:54,928 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 20 treesize of output 16 [2021-11-21 02:01:56,785 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 20 treesize of output 16 [2021-11-21 02:01:57,605 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 29 treesize of output 21 [2021-11-21 02:01:58,667 INFO L354 Elim1Store]: treesize reduction 31, result has 3.1 percent of original size [2021-11-21 02:01:58,668 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 86 treesize of output 74 [2021-11-21 02:02:00,092 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 20 treesize of output 16 [2021-11-21 02:02:01,961 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 20 treesize of output 16 [2021-11-21 02:02:02,447 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 02:02:04,785 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 02:02:04,785 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 02:02:04,786 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [53, 54, 54] total 107 [2021-11-21 02:02:04,786 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1314781568] [2021-11-21 02:02:04,786 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 02:02:04,787 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 107 states [2021-11-21 02:02:04,787 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 02:02:04,789 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 107 interpolants. [2021-11-21 02:02:04,790 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5702, Invalid=7638, Unknown=0, NotChecked=0, Total=13340 [2021-11-21 02:02:04,791 INFO L87 Difference]: Start difference. First operand 871 states and 1233 transitions. Second operand has 107 states, 107 states have (on average 4.542056074766355) internal successors, (486), 107 states have internal predecessors, (486), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 02:02:12,529 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 02:02:12,529 INFO L93 Difference]: Finished difference Result 7838 states and 11900 transitions. [2021-11-21 02:02:12,530 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 106 states. [2021-11-21 02:02:12,530 INFO L78 Accepts]: Start accepts. Automaton has has 107 states, 107 states have (on average 4.542056074766355) internal successors, (486), 107 states have internal predecessors, (486), 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 300 [2021-11-21 02:02:12,530 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 02:02:12,558 INFO L225 Difference]: With dead ends: 7838 [2021-11-21 02:02:12,558 INFO L226 Difference]: Without dead ends: 7020 [2021-11-21 02:02:12,563 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 951 GetRequests, 785 SyntacticMatches, 52 SemanticMatches, 114 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9994 ImplicationChecksByTransitivity, 5.7s TimeCoverageRelationStatistics Valid=5702, Invalid=7638, Unknown=0, NotChecked=0, Total=13340 [2021-11-21 02:02:12,564 INFO L933 BasicCegarLoop]: 15 mSDtfsCounter, 6351 mSDsluCounter, 1557 mSDsCounter, 0 mSdLazyCounter, 843 mSolverCounterSat, 491 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6351 SdHoareTripleChecker+Valid, 1366 SdHoareTripleChecker+Invalid, 1334 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 491 IncrementalHoareTripleChecker+Valid, 843 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.1s IncrementalHoareTripleChecker+Time [2021-11-21 02:02:12,564 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [6351 Valid, 1366 Invalid, 1334 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [491 Valid, 843 Invalid, 0 Unknown, 0 Unchecked, 1.1s Time] [2021-11-21 02:02:12,573 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 7020 states. [2021-11-21 02:02:12,900 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 7020 to 1666. [2021-11-21 02:02:12,904 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1666 states, 1665 states have (on average 1.409009009009009) internal successors, (2346), 1665 states have internal predecessors, (2346), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 02:02:12,909 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1666 states to 1666 states and 2346 transitions. [2021-11-21 02:02:12,909 INFO L78 Accepts]: Start accepts. Automaton has 1666 states and 2346 transitions. Word has length 300 [2021-11-21 02:02:12,909 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 02:02:12,909 INFO L470 AbstractCegarLoop]: Abstraction has 1666 states and 2346 transitions. [2021-11-21 02:02:12,910 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 107 states, 107 states have (on average 4.542056074766355) internal successors, (486), 107 states have internal predecessors, (486), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 02:02:12,910 INFO L276 IsEmpty]: Start isEmpty. Operand 1666 states and 2346 transitions. [2021-11-21 02:02:12,926 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 566 [2021-11-21 02:02:12,926 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 02:02:12,927 INFO L514 BasicCegarLoop]: trace histogram [104, 104, 104, 104, 104, 10, 10, 10, 10, 1, 1, 1, 1, 1] [2021-11-21 02:02:12,965 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2289cc5-6a5a-45e8-9837-8c6d2aaeb177/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-11-21 02:02:13,153 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2289cc5-6a5a-45e8-9837-8c6d2aaeb177/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 02:02:13,153 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 02:02:13,154 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 02:02:13,154 INFO L85 PathProgramCache]: Analyzing trace with hash 1727631025, now seen corresponding path program 7 times [2021-11-21 02:02:13,154 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 02:02:13,154 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [776047186] [2021-11-21 02:02:13,154 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 02:02:13,154 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 02:02:13,490 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 02:02:17,953 INFO L134 CoverageAnalysis]: Checked inductivity of 28208 backedges. 0 proven. 5460 refuted. 0 times theorem prover too weak. 22748 trivial. 0 not checked. [2021-11-21 02:02:17,953 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 02:02:17,954 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [776047186] [2021-11-21 02:02:17,954 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [776047186] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 02:02:17,954 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [25166681] [2021-11-21 02:02:17,954 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-21 02:02:17,954 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 02:02:17,955 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2289cc5-6a5a-45e8-9837-8c6d2aaeb177/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 02:02:17,955 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2289cc5-6a5a-45e8-9837-8c6d2aaeb177/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 02:02:17,956 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2289cc5-6a5a-45e8-9837-8c6d2aaeb177/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-11-21 02:02:18,306 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 02:02:18,319 INFO L263 TraceCheckSpWp]: Trace formula consists of 2680 conjuncts, 106 conjunts are in the unsatisfiable core [2021-11-21 02:02:18,332 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 02:02:19,295 INFO L134 CoverageAnalysis]: Checked inductivity of 28208 backedges. 0 proven. 5460 refuted. 0 times theorem prover too weak. 22748 trivial. 0 not checked. [2021-11-21 02:02:19,296 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 02:02:30,882 INFO L134 CoverageAnalysis]: Checked inductivity of 28208 backedges. 0 proven. 5460 refuted. 0 times theorem prover too weak. 22748 trivial. 0 not checked. [2021-11-21 02:02:30,883 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [25166681] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 02:02:30,883 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [19099379] [2021-11-21 02:02:30,886 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2021-11-21 02:02:30,886 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 02:02:30,886 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 02:02:30,887 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 02:02:30,887 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 02:02:30,909 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 02:02:30,910 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 02:02:30,943 INFO L354 Elim1Store]: treesize reduction 33, result has 40.0 percent of original size [2021-11-21 02:02:30,943 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 2 case distinctions, treesize of input 20 treesize of output 38 [2021-11-21 02:02:30,984 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 02:02:30,986 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 02:02:30,989 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 02:02:30,990 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 02:02:31,027 INFO L354 Elim1Store]: treesize reduction 60, result has 24.1 percent of original size [2021-11-21 02:02:31,027 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 39 treesize of output 53 [2021-11-21 02:02:31,096 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 02:02:31,098 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 4 new quantified variables, introduced 0 case distinctions, treesize of input 64 treesize of output 82 [2021-11-21 02:02:31,146 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 02:02:31,148 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 45 treesize of output 29 [2021-11-21 02:02:31,280 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 02:02:31,280 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 91 treesize of output 55 [2021-11-21 02:02:31,563 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 56 treesize of output 54 [2021-11-21 02:02:31,596 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 12 [2021-11-21 02:02:31,678 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 83 treesize of output 41 [2021-11-21 02:02:31,971 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 20 treesize of output 16 [2021-11-21 02:02:32,324 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 29 treesize of output 21 [2021-11-21 02:02:32,810 INFO L354 Elim1Store]: treesize reduction 31, result has 3.1 percent of original size [2021-11-21 02:02:32,810 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 80 treesize of output 68 [2021-11-21 02:02:33,439 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 20 treesize of output 16 [2021-11-21 02:02:34,540 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 20 treesize of output 16 [2021-11-21 02:02:35,131 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 27 treesize of output 19 [2021-11-21 02:02:35,975 INFO L354 Elim1Store]: treesize reduction 31, result has 3.1 percent of original size [2021-11-21 02:02:35,975 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 86 treesize of output 74 [2021-11-21 02:02:36,963 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 20 treesize of output 16 [2021-11-21 02:02:38,989 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 20 treesize of output 16 [2021-11-21 02:02:39,730 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 29 treesize of output 21 [2021-11-21 02:02:40,931 INFO L354 Elim1Store]: treesize reduction 31, result has 3.1 percent of original size [2021-11-21 02:02:40,931 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 86 treesize of output 74 [2021-11-21 02:02:42,191 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 20 treesize of output 16 [2021-11-21 02:02:43,179 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 20 treesize of output 16 [2021-11-21 02:02:44,013 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 02:02:50,881 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 02:02:50,881 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 02:02:50,882 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [106, 106, 106] total 212 [2021-11-21 02:02:50,882 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [916829235] [2021-11-21 02:02:50,882 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 02:02:50,884 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 213 states [2021-11-21 02:02:50,884 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 02:02:50,887 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 213 interpolants. [2021-11-21 02:02:50,892 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=22609, Invalid=26453, Unknown=0, NotChecked=0, Total=49062 [2021-11-21 02:02:50,893 INFO L87 Difference]: Start difference. First operand 1666 states and 2346 transitions. Second operand has 213 states, 213 states have (on average 1.056338028169014) internal successors, (225), 212 states have internal predecessors, (225), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 02:04:17,415 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 02:04:17,415 INFO L93 Difference]: Finished difference Result 15523 states and 23560 transitions. [2021-11-21 02:04:17,415 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 212 states. [2021-11-21 02:04:17,416 INFO L78 Accepts]: Start accepts. Automaton has has 213 states, 213 states have (on average 1.056338028169014) internal successors, (225), 212 states have internal predecessors, (225), 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 565 [2021-11-21 02:04:17,416 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 02:04:17,466 INFO L225 Difference]: With dead ends: 15523 [2021-11-21 02:04:17,466 INFO L226 Difference]: Without dead ends: 13963 [2021-11-21 02:04:17,473 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1799 GetRequests, 1474 SyntacticMatches, 105 SemanticMatches, 220 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 36865 ImplicationChecksByTransitivity, 21.3s TimeCoverageRelationStatistics Valid=22609, Invalid=26453, Unknown=0, NotChecked=0, Total=49062 [2021-11-21 02:04:17,474 INFO L933 BasicCegarLoop]: 15 mSDtfsCounter, 17290 mSDsluCounter, 3166 mSDsCounter, 0 mSdLazyCounter, 1701 mSolverCounterSat, 1128 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 17290 SdHoareTripleChecker+Valid, 2761 SdHoareTripleChecker+Invalid, 2829 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 1128 IncrementalHoareTripleChecker+Valid, 1701 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.3s IncrementalHoareTripleChecker+Time [2021-11-21 02:04:17,475 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [17290 Valid, 2761 Invalid, 2829 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [1128 Valid, 1701 Invalid, 0 Unknown, 0 Unchecked, 2.3s Time] [2021-11-21 02:04:17,489 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13963 states. [2021-11-21 02:04:18,018 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13963 to 3256. [2021-11-21 02:04:18,025 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3256 states, 3255 states have (on average 1.4046082949308756) internal successors, (4572), 3255 states have internal predecessors, (4572), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 02:04:18,033 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3256 states to 3256 states and 4572 transitions. [2021-11-21 02:04:18,034 INFO L78 Accepts]: Start accepts. Automaton has 3256 states and 4572 transitions. Word has length 565 [2021-11-21 02:04:18,034 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 02:04:18,034 INFO L470 AbstractCegarLoop]: Abstraction has 3256 states and 4572 transitions. [2021-11-21 02:04:18,035 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 213 states, 213 states have (on average 1.056338028169014) internal successors, (225), 212 states have internal predecessors, (225), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 02:04:18,035 INFO L276 IsEmpty]: Start isEmpty. Operand 3256 states and 4572 transitions. [2021-11-21 02:04:18,051 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1096 [2021-11-21 02:04:18,051 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 02:04:18,052 INFO L514 BasicCegarLoop]: trace histogram [210, 210, 210, 210, 210, 10, 10, 10, 10, 1, 1, 1, 1, 1] [2021-11-21 02:04:18,077 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2289cc5-6a5a-45e8-9837-8c6d2aaeb177/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-11-21 02:04:18,257 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2289cc5-6a5a-45e8-9837-8c6d2aaeb177/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2021-11-21 02:04:18,258 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 02:04:18,258 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 02:04:18,258 INFO L85 PathProgramCache]: Analyzing trace with hash 1693807141, now seen corresponding path program 8 times [2021-11-21 02:04:18,258 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 02:04:18,258 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [437632840] [2021-11-21 02:04:18,258 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 02:04:18,258 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 02:04:19,164 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 02:04:33,973 INFO L134 CoverageAnalysis]: Checked inductivity of 112425 backedges. 0 proven. 22155 refuted. 0 times theorem prover too weak. 90270 trivial. 0 not checked. [2021-11-21 02:04:33,973 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 02:04:33,973 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [437632840] [2021-11-21 02:04:33,973 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [437632840] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 02:04:33,973 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [262161433] [2021-11-21 02:04:33,974 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 02:04:33,974 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 02:04:33,974 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2289cc5-6a5a-45e8-9837-8c6d2aaeb177/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 02:04:33,974 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2289cc5-6a5a-45e8-9837-8c6d2aaeb177/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 02:04:33,975 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c2289cc5-6a5a-45e8-9837-8c6d2aaeb177/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-11-21 02:04:35,567 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2021-11-21 02:04:35,567 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 02:04:35,573 INFO L263 TraceCheckSpWp]: Trace formula consists of 607 conjuncts, 16 conjunts are in the unsatisfiable core [2021-11-21 02:04:35,589 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 02:04:38,120 INFO L134 CoverageAnalysis]: Checked inductivity of 112425 backedges. 2509 proven. 190 refuted. 0 times theorem prover too weak. 109726 trivial. 0 not checked. [2021-11-21 02:04:38,121 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 02:04:40,962 INFO L134 CoverageAnalysis]: Checked inductivity of 112425 backedges. 2509 proven. 190 refuted. 0 times theorem prover too weak. 109726 trivial. 0 not checked. [2021-11-21 02:04:40,962 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [262161433] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 02:04:40,963 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1231711874] [2021-11-21 02:04:40,965 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2021-11-21 02:04:40,965 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 02:04:40,966 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 02:04:40,966 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 02:04:40,966 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 02:04:41,004 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 02:04:41,005 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 02:04:41,032 INFO L354 Elim1Store]: treesize reduction 33, result has 40.0 percent of original size [2021-11-21 02:04:41,033 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 38 [2021-11-21 02:04:41,059 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 02:04:41,061 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 02:04:41,063 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 02:04:41,064 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 02:04:41,095 INFO L354 Elim1Store]: treesize reduction 60, result has 24.1 percent of original size [2021-11-21 02:04:41,095 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 39 treesize of output 53 [2021-11-21 02:04:41,149 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 02:04:41,149 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 4 new quantified variables, introduced 0 case distinctions, treesize of input 64 treesize of output 82 [2021-11-21 02:04:41,191 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 02:04:41,192 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 3 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 30 treesize of output 18 [2021-11-21 02:04:41,276 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 02:04:41,277 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 3 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 76 treesize of output 44 [2021-11-21 02:04:41,426 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 2 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 56 treesize of output 54 [2021-11-21 02:04:41,457 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 14 [2021-11-21 02:04:41,499 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 83 treesize of output 41 [2021-11-21 02:04:41,735 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 20 treesize of output 16 [2021-11-21 02:04:41,993 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 27 treesize of output 19 [2021-11-21 02:04:42,403 INFO L354 Elim1Store]: treesize reduction 31, result has 3.1 percent of original size [2021-11-21 02:04:42,404 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 80 treesize of output 68 [2021-11-21 02:04:43,014 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 20 treesize of output 16 [2021-11-21 02:04:43,936 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 20 treesize of output 16 [2021-11-21 02:04:44,528 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 27 treesize of output 19 [2021-11-21 02:04:45,217 INFO L354 Elim1Store]: treesize reduction 31, result has 3.1 percent of original size [2021-11-21 02:04:45,218 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 86 treesize of output 74 [2021-11-21 02:04:46,224 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 20 treesize of output 16 [2021-11-21 02:04:48,140 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 20 treesize of output 16 [2021-11-21 02:04:49,062 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 27 treesize of output 19 [2021-11-21 02:04:49,989 INFO L354 Elim1Store]: treesize reduction 31, result has 3.1 percent of original size [2021-11-21 02:04:49,989 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 86 treesize of output 74 [2021-11-21 02:04:51,412 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 20 treesize of output 16 [2021-11-21 02:04:52,134 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 20 treesize of output 16 [2021-11-21 02:04:52,492 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 02:05:18,387 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 02:05:18,387 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 02:05:18,388 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [212, 15, 15] total 238 [2021-11-21 02:05:18,388 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1129593794] [2021-11-21 02:05:18,389 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 02:05:18,391 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 238 states [2021-11-21 02:05:18,391 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 02:05:18,396 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 238 interpolants. [2021-11-21 02:05:18,401 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=22893, Invalid=37869, Unknown=0, NotChecked=0, Total=60762 [2021-11-21 02:05:18,402 INFO L87 Difference]: Start difference. First operand 3256 states and 4572 transitions. Second operand has 238 states, 238 states have (on average 1.3319327731092436) internal successors, (317), 238 states have internal predecessors, (317), 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)