./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/array-cav19/array_init_pair_symmetr2.c --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_d9d08ded-7547-46b1-b24a-3df4843ba7d0/bin/utaipan-TEXQjIfE4P/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9d08ded-7547-46b1-b24a-3df4843ba7d0/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_d9d08ded-7547-46b1-b24a-3df4843ba7d0/bin/utaipan-TEXQjIfE4P/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9d08ded-7547-46b1-b24a-3df4843ba7d0/bin/utaipan-TEXQjIfE4P/config/TaipanReach.xml -i ../../sv-benchmarks/c/array-cav19/array_init_pair_symmetr2.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9d08ded-7547-46b1-b24a-3df4843ba7d0/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_d9d08ded-7547-46b1-b24a-3df4843ba7d0/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 4caa1f295436b297cae57f4102149db941e37f67b5d377cc8e9aa7b58bbf9350 --- Real Ultimate output --- This is Ultimate 0.2.1-dev-53f42b1 [2021-11-21 00:54:26,187 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-21 00:54:26,189 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-21 00:54:26,233 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-21 00:54:26,234 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-21 00:54:26,240 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-21 00:54:26,242 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-21 00:54:26,246 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-21 00:54:26,250 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-21 00:54:26,252 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-21 00:54:26,253 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-21 00:54:26,256 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-21 00:54:26,257 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-21 00:54:26,265 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-21 00:54:26,268 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-21 00:54:26,271 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-21 00:54:26,273 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-21 00:54:26,276 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-21 00:54:26,281 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-21 00:54:26,284 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-21 00:54:26,286 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-21 00:54:26,287 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-21 00:54:26,289 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-21 00:54:26,290 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-21 00:54:26,294 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-21 00:54:26,297 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-21 00:54:26,298 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-21 00:54:26,299 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-21 00:54:26,301 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-21 00:54:26,302 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-21 00:54:26,304 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-21 00:54:26,305 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-21 00:54:26,307 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-21 00:54:26,308 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-21 00:54:26,310 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-21 00:54:26,310 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-21 00:54:26,311 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-21 00:54:26,311 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-21 00:54:26,312 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-21 00:54:26,313 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-21 00:54:26,313 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-21 00:54:26,314 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9d08ded-7547-46b1-b24a-3df4843ba7d0/bin/utaipan-TEXQjIfE4P/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-21 00:54:26,365 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-21 00:54:26,366 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-21 00:54:26,366 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-21 00:54:26,367 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-21 00:54:26,368 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-21 00:54:26,368 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-21 00:54:26,368 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-21 00:54:26,368 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-21 00:54:26,369 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-21 00:54:26,369 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-21 00:54:26,370 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-21 00:54:26,370 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-21 00:54:26,371 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-21 00:54:26,371 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-21 00:54:26,371 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-21 00:54:26,371 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-21 00:54:26,372 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-21 00:54:26,372 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-21 00:54:26,373 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-21 00:54:26,373 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-21 00:54:26,373 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-21 00:54:26,373 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-21 00:54:26,374 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-21 00:54:26,374 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-21 00:54:26,374 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-21 00:54:26,374 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-21 00:54:26,376 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-21 00:54:26,376 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-21 00:54:26,377 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-21 00:54:26,377 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-21 00:54:26,377 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-21 00:54:26,378 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-21 00:54:26,378 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-21 00:54:26,378 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-21 00:54:26,378 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-21 00:54:26,379 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-21 00:54:26,379 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-21 00:54:26,379 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-21 00:54:26,379 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-21 00:54:26,379 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-21 00:54:26,380 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-21 00:54:26,380 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_d9d08ded-7547-46b1-b24a-3df4843ba7d0/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9d08ded-7547-46b1-b24a-3df4843ba7d0/bin/utaipan-TEXQjIfE4P Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 4caa1f295436b297cae57f4102149db941e37f67b5d377cc8e9aa7b58bbf9350 [2021-11-21 00:54:26,686 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-21 00:54:26,707 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-21 00:54:26,710 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-21 00:54:26,711 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-21 00:54:26,712 INFO L275 PluginConnector]: CDTParser initialized [2021-11-21 00:54:26,714 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9d08ded-7547-46b1-b24a-3df4843ba7d0/bin/utaipan-TEXQjIfE4P/../../sv-benchmarks/c/array-cav19/array_init_pair_symmetr2.c [2021-11-21 00:54:26,805 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9d08ded-7547-46b1-b24a-3df4843ba7d0/bin/utaipan-TEXQjIfE4P/data/99b2dfa84/36f6506df4eb4907884ad579299388e3/FLAG109432041 [2021-11-21 00:54:27,232 INFO L306 CDTParser]: Found 1 translation units. [2021-11-21 00:54:27,232 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9d08ded-7547-46b1-b24a-3df4843ba7d0/sv-benchmarks/c/array-cav19/array_init_pair_symmetr2.c [2021-11-21 00:54:27,238 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9d08ded-7547-46b1-b24a-3df4843ba7d0/bin/utaipan-TEXQjIfE4P/data/99b2dfa84/36f6506df4eb4907884ad579299388e3/FLAG109432041 [2021-11-21 00:54:27,620 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9d08ded-7547-46b1-b24a-3df4843ba7d0/bin/utaipan-TEXQjIfE4P/data/99b2dfa84/36f6506df4eb4907884ad579299388e3 [2021-11-21 00:54:27,622 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-21 00:54:27,624 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-21 00:54:27,628 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-21 00:54:27,628 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-21 00:54:27,632 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-21 00:54:27,633 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.11 12:54:27" (1/1) ... [2021-11-21 00:54:27,635 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@5f8cc46d and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:54:27, skipping insertion in model container [2021-11-21 00:54:27,635 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.11 12:54:27" (1/1) ... [2021-11-21 00:54:27,643 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-21 00:54:27,669 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-21 00:54:27,856 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_d9d08ded-7547-46b1-b24a-3df4843ba7d0/sv-benchmarks/c/array-cav19/array_init_pair_symmetr2.c[415,428] [2021-11-21 00:54:27,881 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-21 00:54:27,889 INFO L203 MainTranslator]: Completed pre-run [2021-11-21 00:54:27,905 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_d9d08ded-7547-46b1-b24a-3df4843ba7d0/sv-benchmarks/c/array-cav19/array_init_pair_symmetr2.c[415,428] [2021-11-21 00:54:27,932 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-21 00:54:27,944 INFO L208 MainTranslator]: Completed translation [2021-11-21 00:54:27,948 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:54:27 WrapperNode [2021-11-21 00:54:27,948 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-21 00:54:27,950 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-21 00:54:27,950 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-21 00:54:27,950 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-21 00:54:27,957 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:54:27" (1/1) ... [2021-11-21 00:54:27,976 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:54:27" (1/1) ... [2021-11-21 00:54:28,004 INFO L137 Inliner]: procedures = 15, calls = 26, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 77 [2021-11-21 00:54:28,005 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-21 00:54:28,006 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-21 00:54:28,006 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-21 00:54:28,006 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-21 00:54:28,015 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:54:27" (1/1) ... [2021-11-21 00:54:28,015 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:54:27" (1/1) ... [2021-11-21 00:54:28,021 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:54:27" (1/1) ... [2021-11-21 00:54:28,021 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:54:27" (1/1) ... [2021-11-21 00:54:28,040 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:54:27" (1/1) ... [2021-11-21 00:54:28,044 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:54:27" (1/1) ... [2021-11-21 00:54:28,050 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:54:27" (1/1) ... [2021-11-21 00:54:28,056 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-21 00:54:28,059 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-21 00:54:28,059 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-21 00:54:28,059 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-21 00:54:28,060 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:54:27" (1/1) ... [2021-11-21 00:54:28,068 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-21 00:54:28,079 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9d08ded-7547-46b1-b24a-3df4843ba7d0/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:54:28,094 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9d08ded-7547-46b1-b24a-3df4843ba7d0/bin/utaipan-TEXQjIfE4P/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-21 00:54:28,125 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9d08ded-7547-46b1-b24a-3df4843ba7d0/bin/utaipan-TEXQjIfE4P/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-21 00:54:28,149 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-21 00:54:28,149 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2021-11-21 00:54:28,149 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2021-11-21 00:54:28,149 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-21 00:54:28,149 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-11-21 00:54:28,149 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-11-21 00:54:28,150 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-21 00:54:28,150 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-21 00:54:28,150 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-11-21 00:54:28,150 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-11-21 00:54:28,204 INFO L236 CfgBuilder]: Building ICFG [2021-11-21 00:54:28,205 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-21 00:54:28,430 INFO L277 CfgBuilder]: Performing block encoding [2021-11-21 00:54:28,475 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-21 00:54:28,475 INFO L301 CfgBuilder]: Removed 3 assume(true) statements. [2021-11-21 00:54:28,477 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.11 12:54:28 BoogieIcfgContainer [2021-11-21 00:54:28,478 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-21 00:54:28,479 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-21 00:54:28,480 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-21 00:54:28,483 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-21 00:54:28,483 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.11 12:54:27" (1/3) ... [2021-11-21 00:54:28,484 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@35dc4349 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.11 12:54:28, skipping insertion in model container [2021-11-21 00:54:28,484 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:54:27" (2/3) ... [2021-11-21 00:54:28,485 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@35dc4349 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.11 12:54:28, skipping insertion in model container [2021-11-21 00:54:28,485 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.11 12:54:28" (3/3) ... [2021-11-21 00:54:28,486 INFO L111 eAbstractionObserver]: Analyzing ICFG array_init_pair_symmetr2.c [2021-11-21 00:54:28,492 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-21 00:54:28,492 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-21 00:54:28,549 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-21 00:54:28,564 INFO L339 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mLoopAccelerationTechnique=FAST_UPR [2021-11-21 00:54:28,564 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-21 00:54:28,596 INFO L276 IsEmpty]: Start isEmpty. Operand has 15 states, 9 states have (on average 1.5555555555555556) internal successors, (14), 10 states have internal predecessors, (14), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-21 00:54:28,601 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2021-11-21 00:54:28,602 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:54:28,602 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2021-11-21 00:54:28,603 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:54:28,608 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:54:28,608 INFO L85 PathProgramCache]: Analyzing trace with hash -1033138693, now seen corresponding path program 1 times [2021-11-21 00:54:28,618 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:54:28,618 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [396449574] [2021-11-21 00:54:28,619 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:54:28,620 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:54:28,716 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:54:28,787 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:54:28,787 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:54:28,788 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [396449574] [2021-11-21 00:54:28,788 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [396449574] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:54:28,789 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 00:54:28,789 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-21 00:54:28,790 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1076770536] [2021-11-21 00:54:28,791 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:54:28,794 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-21 00:54:28,794 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:54:28,819 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-21 00:54:28,820 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-21 00:54:28,822 INFO L87 Difference]: Start difference. First operand has 15 states, 9 states have (on average 1.5555555555555556) internal successors, (14), 10 states have internal predecessors, (14), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Second operand has 3 states, 3 states have (on average 2.0) internal successors, (6), 2 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:54:28,890 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:54:28,890 INFO L93 Difference]: Finished difference Result 27 states and 38 transitions. [2021-11-21 00:54:28,892 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-21 00:54:28,895 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.0) internal successors, (6), 2 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 6 [2021-11-21 00:54:28,895 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:54:28,902 INFO L225 Difference]: With dead ends: 27 [2021-11-21 00:54:28,902 INFO L226 Difference]: Without dead ends: 19 [2021-11-21 00:54:28,905 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-21 00:54:28,913 INFO L933 BasicCegarLoop]: 13 mSDtfsCounter, 1 mSDsluCounter, 7 mSDsCounter, 0 mSdLazyCounter, 21 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4 SdHoareTripleChecker+Valid, 19 SdHoareTripleChecker+Invalid, 21 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 21 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-21 00:54:28,924 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [4 Valid, 19 Invalid, 21 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 21 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-21 00:54:28,941 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2021-11-21 00:54:28,974 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 15. [2021-11-21 00:54:28,975 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 15 states, 10 states have (on average 1.3) internal successors, (13), 10 states have internal predecessors, (13), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-21 00:54:28,977 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 19 transitions. [2021-11-21 00:54:28,978 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 19 transitions. Word has length 6 [2021-11-21 00:54:28,978 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:54:28,978 INFO L470 AbstractCegarLoop]: Abstraction has 15 states and 19 transitions. [2021-11-21 00:54:28,979 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 2.0) internal successors, (6), 2 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:54:28,979 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 19 transitions. [2021-11-21 00:54:28,981 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-11-21 00:54:28,981 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:54:28,982 INFO L514 BasicCegarLoop]: trace histogram [3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:54:28,982 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-21 00:54:28,983 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:54:28,987 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:54:28,987 INFO L85 PathProgramCache]: Analyzing trace with hash 1201809854, now seen corresponding path program 1 times [2021-11-21 00:54:28,988 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:54:28,988 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [934790667] [2021-11-21 00:54:28,988 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:54:28,989 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:54:29,051 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:54:29,152 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-21 00:54:29,152 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:54:29,152 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [934790667] [2021-11-21 00:54:29,153 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [934790667] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:54:29,153 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 00:54:29,153 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-21 00:54:29,153 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [611580553] [2021-11-21 00:54:29,153 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:54:29,155 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-21 00:54:29,155 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:54:29,155 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-21 00:54:29,156 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-21 00:54:29,156 INFO L87 Difference]: Start difference. First operand 15 states and 19 transitions. Second operand has 4 states, 4 states have (on average 2.25) internal successors, (9), 4 states have internal predecessors, (9), 1 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) [2021-11-21 00:54:29,234 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:54:29,234 INFO L93 Difference]: Finished difference Result 25 states and 33 transitions. [2021-11-21 00:54:29,235 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-21 00:54:29,235 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.25) internal successors, (9), 4 states have internal predecessors, (9), 1 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) Word has length 17 [2021-11-21 00:54:29,235 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:54:29,236 INFO L225 Difference]: With dead ends: 25 [2021-11-21 00:54:29,236 INFO L226 Difference]: Without dead ends: 20 [2021-11-21 00:54:29,237 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-21 00:54:29,239 INFO L933 BasicCegarLoop]: 9 mSDtfsCounter, 13 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 25 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 16 SdHoareTripleChecker+Valid, 12 SdHoareTripleChecker+Invalid, 30 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 25 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 00:54:29,239 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [16 Valid, 12 Invalid, 30 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 25 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 00:54:29,241 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2021-11-21 00:54:29,245 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 16. [2021-11-21 00:54:29,246 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 16 states, 11 states have (on average 1.2727272727272727) internal successors, (14), 11 states have internal predecessors, (14), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-21 00:54:29,247 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 20 transitions. [2021-11-21 00:54:29,247 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 20 transitions. Word has length 17 [2021-11-21 00:54:29,247 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:54:29,248 INFO L470 AbstractCegarLoop]: Abstraction has 16 states and 20 transitions. [2021-11-21 00:54:29,248 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 2.25) internal successors, (9), 4 states have internal predecessors, (9), 1 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) [2021-11-21 00:54:29,248 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 20 transitions. [2021-11-21 00:54:29,249 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2021-11-21 00:54:29,249 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:54:29,249 INFO L514 BasicCegarLoop]: trace histogram [3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:54:29,250 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-11-21 00:54:29,250 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:54:29,250 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:54:29,251 INFO L85 PathProgramCache]: Analyzing trace with hash -1407331851, now seen corresponding path program 1 times [2021-11-21 00:54:29,251 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:54:29,251 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1717265150] [2021-11-21 00:54:29,251 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:54:29,252 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:54:29,285 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:54:29,352 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-21 00:54:29,352 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:54:29,352 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1717265150] [2021-11-21 00:54:29,353 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1717265150] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:54:29,353 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2010435086] [2021-11-21 00:54:29,353 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:54:29,353 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:54:29,354 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9d08ded-7547-46b1-b24a-3df4843ba7d0/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:54:29,355 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9d08ded-7547-46b1-b24a-3df4843ba7d0/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:54:29,363 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9d08ded-7547-46b1-b24a-3df4843ba7d0/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-21 00:54:29,440 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:54:29,442 INFO L263 TraceCheckSpWp]: Trace formula consists of 105 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-21 00:54:29,447 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:54:29,618 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-21 00:54:29,619 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:54:29,718 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-21 00:54:29,719 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2010435086] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:54:29,723 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [637760089] [2021-11-21 00:54:29,747 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-21 00:54:29,747 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:54:29,751 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:54:29,756 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:54:29,757 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:54:29,862 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:54:29,865 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:54:29,866 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:54:29,868 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:54:29,870 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:54:30,009 INFO L354 Elim1Store]: treesize reduction 190, result has 19.1 percent of original size [2021-11-21 00:54:30,010 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 7 select indices, 7 select index equivalence classes, 12 disjoint index pairs (out of 21 index pairs), introduced 7 new quantified variables, introduced 15 case distinctions, treesize of input 60 treesize of output 93 [2021-11-21 00:54:30,102 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:54:30,103 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:54:30,104 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:54:30,108 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 16 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 34 treesize of output 46 [2021-11-21 00:54:33,114 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 00:54:33,115 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 00:54:33,149 INFO L354 Elim1Store]: treesize reduction 55, result has 26.7 percent of original size [2021-11-21 00:54:33,150 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 340 treesize of output 320 [2021-11-21 00:55:20,583 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 00:55:20,593 INFO L354 Elim1Store]: treesize reduction 18, result has 47.1 percent of original size [2021-11-21 00:55:20,594 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 42 treesize of output 29 [2021-11-21 00:55:21,615 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:55:21,616 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 00:55:21,625 INFO L354 Elim1Store]: treesize reduction 18, result has 47.1 percent of original size [2021-11-21 00:55:21,626 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 42 treesize of output 29 [2021-11-21 00:55:23,113 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:55:23,114 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 00:55:23,123 INFO L354 Elim1Store]: treesize reduction 18, result has 47.1 percent of original size [2021-11-21 00:55:23,123 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 42 treesize of output 29 [2021-11-21 00:55:23,284 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 00:55:23,284 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 00:55:23,309 INFO L354 Elim1Store]: treesize reduction 42, result has 49.4 percent of original size [2021-11-21 00:55:23,309 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 38 treesize of output 57 [2021-11-21 00:55:23,432 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 00:55:23,433 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 00:55:23,469 INFO L354 Elim1Store]: treesize reduction 42, result has 49.4 percent of original size [2021-11-21 00:55:23,470 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 38 treesize of output 57 [2021-11-21 00:55:23,995 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 21 for LOIs [2021-11-21 00:55:24,024 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:55:24,453 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:55:24,453 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:55:24,453 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 9 [2021-11-21 00:55:24,453 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [705279237] [2021-11-21 00:55:24,453 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 00:55:24,454 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-21 00:55:24,454 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:55:24,454 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-21 00:55:24,456 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=89, Invalid=253, Unknown=0, NotChecked=0, Total=342 [2021-11-21 00:55:24,456 INFO L87 Difference]: Start difference. First operand 16 states and 20 transitions. Second operand has 9 states, 9 states have (on average 2.111111111111111) internal successors, (19), 9 states have internal predecessors, (19), 3 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2021-11-21 00:55:24,602 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:55:24,602 INFO L93 Difference]: Finished difference Result 52 states and 72 transitions. [2021-11-21 00:55:24,603 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-21 00:55:24,603 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.111111111111111) internal successors, (19), 9 states have internal predecessors, (19), 3 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) Word has length 18 [2021-11-21 00:55:24,603 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:55:24,604 INFO L225 Difference]: With dead ends: 52 [2021-11-21 00:55:24,605 INFO L226 Difference]: Without dead ends: 45 [2021-11-21 00:55:24,605 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 39 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 147 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=111, Invalid=309, Unknown=0, NotChecked=0, Total=420 [2021-11-21 00:55:24,607 INFO L933 BasicCegarLoop]: 6 mSDtfsCounter, 45 mSDsluCounter, 14 mSDsCounter, 0 mSdLazyCounter, 67 mSolverCounterSat, 56 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 48 SdHoareTripleChecker+Valid, 18 SdHoareTripleChecker+Invalid, 123 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 56 IncrementalHoareTripleChecker+Valid, 67 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 00:55:24,607 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [48 Valid, 18 Invalid, 123 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [56 Valid, 67 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 00:55:24,608 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2021-11-21 00:55:24,617 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 34. [2021-11-21 00:55:24,618 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34 states, 20 states have (on average 1.15) internal successors, (23), 20 states have internal predecessors, (23), 12 states have call successors, (12), 1 states have call predecessors, (12), 1 states have return successors, (12), 12 states have call predecessors, (12), 12 states have call successors, (12) [2021-11-21 00:55:24,619 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 47 transitions. [2021-11-21 00:55:24,619 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 47 transitions. Word has length 18 [2021-11-21 00:55:24,620 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:55:24,620 INFO L470 AbstractCegarLoop]: Abstraction has 34 states and 47 transitions. [2021-11-21 00:55:24,620 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 2.111111111111111) internal successors, (19), 9 states have internal predecessors, (19), 3 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2021-11-21 00:55:24,620 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 47 transitions. [2021-11-21 00:55:24,622 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2021-11-21 00:55:24,622 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:55:24,623 INFO L514 BasicCegarLoop]: trace histogram [12, 4, 4, 4, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1] [2021-11-21 00:55:24,646 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9d08ded-7547-46b1-b24a-3df4843ba7d0/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-21 00:55:24,823 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9d08ded-7547-46b1-b24a-3df4843ba7d0/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2021-11-21 00:55:24,824 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:55:24,824 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:55:24,824 INFO L85 PathProgramCache]: Analyzing trace with hash 2143827323, now seen corresponding path program 2 times [2021-11-21 00:55:24,824 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:55:24,824 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1280794228] [2021-11-21 00:55:24,825 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:55:24,825 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:55:24,867 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:55:24,942 INFO L134 CoverageAnalysis]: Checked inductivity of 176 backedges. 0 proven. 34 refuted. 0 times theorem prover too weak. 142 trivial. 0 not checked. [2021-11-21 00:55:24,943 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:55:24,943 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1280794228] [2021-11-21 00:55:24,943 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1280794228] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:55:24,943 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1141444335] [2021-11-21 00:55:24,944 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 00:55:24,944 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:55:24,944 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9d08ded-7547-46b1-b24a-3df4843ba7d0/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:55:24,945 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9d08ded-7547-46b1-b24a-3df4843ba7d0/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:55:24,965 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9d08ded-7547-46b1-b24a-3df4843ba7d0/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-21 00:55:25,014 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-11-21 00:55:25,014 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 00:55:25,015 INFO L263 TraceCheckSpWp]: Trace formula consists of 129 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-21 00:55:25,018 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:55:25,193 INFO L134 CoverageAnalysis]: Checked inductivity of 176 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 166 trivial. 0 not checked. [2021-11-21 00:55:25,194 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:55:25,360 INFO L134 CoverageAnalysis]: Checked inductivity of 176 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 166 trivial. 0 not checked. [2021-11-21 00:55:25,360 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1141444335] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:55:25,360 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1488074175] [2021-11-21 00:55:25,363 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-21 00:55:25,363 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:55:25,363 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:55:25,363 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:55:25,364 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:55:25,403 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:55:25,404 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:55:25,404 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:55:25,471 INFO L354 Elim1Store]: treesize reduction 140, result has 24.3 percent of original size [2021-11-21 00:55:25,471 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 34 treesize of output 66 [2021-11-21 00:55:25,513 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:55:25,515 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:55:25,516 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:55:25,518 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:55:25,519 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:55:25,591 INFO L354 Elim1Store]: treesize reduction 190, result has 19.1 percent of original size [2021-11-21 00:55:25,592 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 7 select indices, 7 select index equivalence classes, 12 disjoint index pairs (out of 21 index pairs), introduced 7 new quantified variables, introduced 15 case distinctions, treesize of input 60 treesize of output 93 [2021-11-21 00:55:27,758 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:55:27,760 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:55:27,761 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:55:27,764 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 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 42 treesize of output 35 [2021-11-21 00:55:33,261 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:55:33,262 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:55:33,264 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 00:55:33,266 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 00:55:33,266 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 00:55:33,340 INFO L354 Elim1Store]: treesize reduction 250, result has 15.5 percent of original size [2021-11-21 00:55:33,340 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 2 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 9 case distinctions, treesize of input 342 treesize of output 332 [2021-11-21 00:55:36,339 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:55:36,341 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 00:55:36,350 INFO L354 Elim1Store]: treesize reduction 18, result has 47.1 percent of original size [2021-11-21 00:55:36,350 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 42 treesize of output 29 [2021-11-21 00:55:37,798 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:55:37,799 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 00:55:37,809 INFO L354 Elim1Store]: treesize reduction 18, result has 47.1 percent of original size [2021-11-21 00:55:37,809 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 42 treesize of output 29 [2021-11-21 00:55:37,961 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 00:55:37,962 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 00:55:37,986 INFO L354 Elim1Store]: treesize reduction 32, result has 49.2 percent of original size [2021-11-21 00:55:37,986 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 23 treesize of output 42 [2021-11-21 00:55:38,141 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 00:55:38,143 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 00:55:38,144 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 00:55:38,145 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 00:55:38,278 INFO L354 Elim1Store]: treesize reduction 208, result has 36.6 percent of original size [2021-11-21 00:55:38,278 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 5 select indices, 5 select index equivalence classes, 0 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 15 case distinctions, treesize of input 87 treesize of output 168 [2021-11-21 00:55:39,194 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 00:55:39,194 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 00:55:39,222 INFO L354 Elim1Store]: treesize reduction 42, result has 49.4 percent of original size [2021-11-21 00:55:39,222 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 38 treesize of output 57 [2021-11-21 00:55:39,985 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 21 for LOIs [2021-11-21 00:55:40,006 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:55:40,394 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:55:40,395 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:55:40,395 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 8] total 19 [2021-11-21 00:55:40,395 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [198674621] [2021-11-21 00:55:40,395 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 00:55:40,395 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2021-11-21 00:55:40,396 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:55:40,396 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-11-21 00:55:40,396 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=241, Invalid=571, Unknown=0, NotChecked=0, Total=812 [2021-11-21 00:55:40,397 INFO L87 Difference]: Start difference. First operand 34 states and 47 transitions. Second operand has 19 states, 19 states have (on average 1.8421052631578947) internal successors, (35), 19 states have internal predecessors, (35), 6 states have call successors, (18), 2 states have call predecessors, (18), 2 states have return successors, (18), 6 states have call predecessors, (18), 6 states have call successors, (18) [2021-11-21 00:55:40,762 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:55:40,762 INFO L93 Difference]: Finished difference Result 121 states and 165 transitions. [2021-11-21 00:55:40,763 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-11-21 00:55:40,763 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 1.8421052631578947) internal successors, (35), 19 states have internal predecessors, (35), 6 states have call successors, (18), 2 states have call predecessors, (18), 2 states have return successors, (18), 6 states have call predecessors, (18), 6 states have call successors, (18) Word has length 54 [2021-11-21 00:55:40,764 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:55:40,769 INFO L225 Difference]: With dead ends: 121 [2021-11-21 00:55:40,769 INFO L226 Difference]: Without dead ends: 111 [2021-11-21 00:55:40,770 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 172 GetRequests, 140 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 496 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=332, Invalid=790, Unknown=0, NotChecked=0, Total=1122 [2021-11-21 00:55:40,773 INFO L933 BasicCegarLoop]: 6 mSDtfsCounter, 167 mSDsluCounter, 39 mSDsCounter, 0 mSdLazyCounter, 193 mSolverCounterSat, 179 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 179 SdHoareTripleChecker+Valid, 42 SdHoareTripleChecker+Invalid, 372 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 179 IncrementalHoareTripleChecker+Valid, 193 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-21 00:55:40,779 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [179 Valid, 42 Invalid, 372 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [179 Valid, 193 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-21 00:55:40,783 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 111 states. [2021-11-21 00:55:40,802 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 111 to 70. [2021-11-21 00:55:40,806 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 70 states, 38 states have (on average 1.0789473684210527) internal successors, (41), 38 states have internal predecessors, (41), 30 states have call successors, (30), 1 states have call predecessors, (30), 1 states have return successors, (30), 30 states have call predecessors, (30), 30 states have call successors, (30) [2021-11-21 00:55:40,810 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 101 transitions. [2021-11-21 00:55:40,810 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 101 transitions. Word has length 54 [2021-11-21 00:55:40,811 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:55:40,811 INFO L470 AbstractCegarLoop]: Abstraction has 70 states and 101 transitions. [2021-11-21 00:55:40,811 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 19 states have (on average 1.8421052631578947) internal successors, (35), 19 states have internal predecessors, (35), 6 states have call successors, (18), 2 states have call predecessors, (18), 2 states have return successors, (18), 6 states have call predecessors, (18), 6 states have call successors, (18) [2021-11-21 00:55:40,812 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 101 transitions. [2021-11-21 00:55:40,821 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 127 [2021-11-21 00:55:40,821 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:55:40,822 INFO L514 BasicCegarLoop]: trace histogram [30, 10, 10, 10, 10, 10, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1] [2021-11-21 00:55:40,860 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9d08ded-7547-46b1-b24a-3df4843ba7d0/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-21 00:55:41,029 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9d08ded-7547-46b1-b24a-3df4843ba7d0/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:55:41,030 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:55:41,030 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:55:41,030 INFO L85 PathProgramCache]: Analyzing trace with hash 1580456123, now seen corresponding path program 3 times [2021-11-21 00:55:41,030 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:55:41,030 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [234815261] [2021-11-21 00:55:41,030 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:55:41,030 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:55:41,111 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:55:41,364 INFO L134 CoverageAnalysis]: Checked inductivity of 1160 backedges. 0 proven. 235 refuted. 0 times theorem prover too weak. 925 trivial. 0 not checked. [2021-11-21 00:55:41,364 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:55:41,365 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [234815261] [2021-11-21 00:55:41,365 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [234815261] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:55:41,365 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [446512285] [2021-11-21 00:55:41,365 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-21 00:55:41,365 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:55:41,366 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9d08ded-7547-46b1-b24a-3df4843ba7d0/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:55:41,370 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9d08ded-7547-46b1-b24a-3df4843ba7d0/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:55:41,392 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9d08ded-7547-46b1-b24a-3df4843ba7d0/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-21 00:55:44,905 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-21 00:55:44,906 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 00:55:44,916 INFO L263 TraceCheckSpWp]: Trace formula consists of 465 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-21 00:55:44,924 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:55:45,428 INFO L134 CoverageAnalysis]: Checked inductivity of 1160 backedges. 0 proven. 235 refuted. 0 times theorem prover too weak. 925 trivial. 0 not checked. [2021-11-21 00:55:45,429 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:55:45,910 INFO L134 CoverageAnalysis]: Checked inductivity of 1160 backedges. 0 proven. 235 refuted. 0 times theorem prover too weak. 925 trivial. 0 not checked. [2021-11-21 00:55:45,910 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [446512285] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:55:45,910 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [335683590] [2021-11-21 00:55:45,913 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-21 00:55:45,913 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:55:45,913 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:55:45,914 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:55:45,914 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:55:45,948 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:55:45,951 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:55:45,954 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:55:46,052 INFO L354 Elim1Store]: treesize reduction 190, result has 19.1 percent of original size [2021-11-21 00:55:46,052 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 7 select indices, 7 select index equivalence classes, 12 disjoint index pairs (out of 21 index pairs), introduced 7 new quantified variables, introduced 15 case distinctions, treesize of input 60 treesize of output 93 [2021-11-21 00:55:46,142 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:55:46,143 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:55:46,144 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:55:46,145 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 16 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 34 treesize of output 46 [2021-11-21 00:55:48,140 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 00:55:48,141 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 00:55:48,162 INFO L354 Elim1Store]: treesize reduction 55, result has 26.7 percent of original size [2021-11-21 00:55:48,163 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 340 treesize of output 320 [2021-11-21 00:56:23,535 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:56:23,537 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:56:23,540 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:56:23,541 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:56:23,542 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:56:23,543 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:56:23,554 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 00:56:23,557 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 00:56:23,559 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:56:23,603 INFO L354 Elim1Store]: treesize reduction 142, result has 12.3 percent of original size [2021-11-21 00:56:23,604 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 4 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 7 case distinctions, treesize of input 348 treesize of output 316 [2021-11-21 00:56:38,767 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:56:38,768 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 00:56:38,778 INFO L354 Elim1Store]: treesize reduction 18, result has 47.1 percent of original size [2021-11-21 00:56:38,778 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 42 treesize of output 29 [2021-11-21 00:56:40,016 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:56:40,017 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 00:56:40,026 INFO L354 Elim1Store]: treesize reduction 18, result has 47.1 percent of original size [2021-11-21 00:56:40,026 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 42 treesize of output 29 [2021-11-21 00:56:40,137 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 00:56:40,138 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 00:56:40,162 INFO L354 Elim1Store]: treesize reduction 32, result has 49.2 percent of original size [2021-11-21 00:56:40,163 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 23 treesize of output 42 [2021-11-21 00:56:40,285 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 00:56:40,287 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 00:56:40,287 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 00:56:40,288 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 00:56:40,412 INFO L354 Elim1Store]: treesize reduction 210, result has 36.0 percent of original size [2021-11-21 00:56:40,413 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 5 select indices, 5 select index equivalence classes, 0 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 15 case distinctions, treesize of input 87 treesize of output 166 [2021-11-21 00:56:41,167 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 00:56:41,168 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 00:56:41,195 INFO L354 Elim1Store]: treesize reduction 42, result has 49.4 percent of original size [2021-11-21 00:56:41,196 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 38 treesize of output 57 [2021-11-21 00:56:41,842 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 21 for LOIs [2021-11-21 00:56:41,871 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:56:42,449 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:56:42,450 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:56:42,450 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 36 [2021-11-21 00:56:42,450 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1480414175] [2021-11-21 00:56:42,450 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 00:56:42,451 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 36 states [2021-11-21 00:56:42,452 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:56:42,452 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2021-11-21 00:56:42,453 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=702, Invalid=1368, Unknown=0, NotChecked=0, Total=2070 [2021-11-21 00:56:42,454 INFO L87 Difference]: Start difference. First operand 70 states and 101 transitions. Second operand has 36 states, 36 states have (on average 2.0277777777777777) internal successors, (73), 36 states have internal predecessors, (73), 30 states have call successors, (90), 2 states have call predecessors, (90), 2 states have return successors, (90), 30 states have call predecessors, (90), 30 states have call successors, (90) [2021-11-21 00:56:43,307 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:56:43,307 INFO L93 Difference]: Finished difference Result 259 states and 351 transitions. [2021-11-21 00:56:43,308 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-11-21 00:56:43,308 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 36 states have (on average 2.0277777777777777) internal successors, (73), 36 states have internal predecessors, (73), 30 states have call successors, (90), 2 states have call predecessors, (90), 2 states have return successors, (90), 30 states have call predecessors, (90), 30 states have call successors, (90) Word has length 126 [2021-11-21 00:56:43,309 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:56:43,312 INFO L225 Difference]: With dead ends: 259 [2021-11-21 00:56:43,312 INFO L226 Difference]: Without dead ends: 243 [2021-11-21 00:56:43,314 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 400 GetRequests, 345 SyntacticMatches, 0 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1391 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=1022, Invalid=2170, Unknown=0, NotChecked=0, Total=3192 [2021-11-21 00:56:43,315 INFO L933 BasicCegarLoop]: 6 mSDtfsCounter, 444 mSDsluCounter, 81 mSDsCounter, 0 mSdLazyCounter, 439 mSolverCounterSat, 381 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 447 SdHoareTripleChecker+Valid, 84 SdHoareTripleChecker+Invalid, 820 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 381 IncrementalHoareTripleChecker+Valid, 439 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-21 00:56:43,315 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [447 Valid, 84 Invalid, 820 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [381 Valid, 439 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2021-11-21 00:56:43,316 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 243 states. [2021-11-21 00:56:43,338 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 243 to 142. [2021-11-21 00:56:43,339 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 142 states, 74 states have (on average 1.0405405405405406) internal successors, (77), 74 states have internal predecessors, (77), 66 states have call successors, (66), 1 states have call predecessors, (66), 1 states have return successors, (66), 66 states have call predecessors, (66), 66 states have call successors, (66) [2021-11-21 00:56:43,342 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 142 states to 142 states and 209 transitions. [2021-11-21 00:56:43,342 INFO L78 Accepts]: Start accepts. Automaton has 142 states and 209 transitions. Word has length 126 [2021-11-21 00:56:43,343 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:56:43,343 INFO L470 AbstractCegarLoop]: Abstraction has 142 states and 209 transitions. [2021-11-21 00:56:43,344 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 36 states, 36 states have (on average 2.0277777777777777) internal successors, (73), 36 states have internal predecessors, (73), 30 states have call successors, (90), 2 states have call predecessors, (90), 2 states have return successors, (90), 30 states have call predecessors, (90), 30 states have call successors, (90) [2021-11-21 00:56:43,344 INFO L276 IsEmpty]: Start isEmpty. Operand 142 states and 209 transitions. [2021-11-21 00:56:43,350 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 271 [2021-11-21 00:56:43,350 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:56:43,351 INFO L514 BasicCegarLoop]: trace histogram [66, 22, 22, 22, 22, 22, 22, 22, 22, 22, 1, 1, 1, 1, 1, 1] [2021-11-21 00:56:43,393 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9d08ded-7547-46b1-b24a-3df4843ba7d0/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-21 00:56:43,565 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9d08ded-7547-46b1-b24a-3df4843ba7d0/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:56:43,566 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:56:43,566 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:56:43,566 INFO L85 PathProgramCache]: Analyzing trace with hash 81571643, now seen corresponding path program 4 times [2021-11-21 00:56:43,566 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:56:43,566 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1816051460] [2021-11-21 00:56:43,566 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:56:43,567 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:56:43,724 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:56:44,165 INFO L134 CoverageAnalysis]: Checked inductivity of 5720 backedges. 0 proven. 1177 refuted. 0 times theorem prover too weak. 4543 trivial. 0 not checked. [2021-11-21 00:56:44,165 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:56:44,166 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1816051460] [2021-11-21 00:56:44,166 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1816051460] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:56:44,166 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [693023626] [2021-11-21 00:56:44,166 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-21 00:56:44,166 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:56:44,166 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9d08ded-7547-46b1-b24a-3df4843ba7d0/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:56:44,170 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9d08ded-7547-46b1-b24a-3df4843ba7d0/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:56:44,189 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9d08ded-7547-46b1-b24a-3df4843ba7d0/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-21 00:56:44,345 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:56:44,350 INFO L263 TraceCheckSpWp]: Trace formula consists of 945 conjuncts, 25 conjunts are in the unsatisfiable core [2021-11-21 00:56:44,370 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:56:45,665 INFO L134 CoverageAnalysis]: Checked inductivity of 5720 backedges. 0 proven. 1177 refuted. 0 times theorem prover too weak. 4543 trivial. 0 not checked. [2021-11-21 00:56:45,665 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:56:46,969 INFO L134 CoverageAnalysis]: Checked inductivity of 5720 backedges. 0 proven. 1177 refuted. 0 times theorem prover too weak. 4543 trivial. 0 not checked. [2021-11-21 00:56:46,969 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [693023626] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:56:46,969 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [328287776] [2021-11-21 00:56:46,973 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-21 00:56:46,973 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:56:46,973 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:56:46,973 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:56:46,974 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:56:47,020 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:56:47,021 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:56:47,023 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:56:47,024 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:56:47,026 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:56:47,027 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:56:47,104 INFO L354 Elim1Store]: treesize reduction 190, result has 19.1 percent of original size [2021-11-21 00:56:47,104 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 7 select indices, 7 select index equivalence classes, 12 disjoint index pairs (out of 21 index pairs), introduced 7 new quantified variables, introduced 15 case distinctions, treesize of input 60 treesize of output 93 [2021-11-21 00:56:47,151 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:56:47,152 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:56:47,153 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:56:47,156 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 15 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 34 treesize of output 46 [2021-11-21 00:56:48,979 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 00:56:48,981 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 00:56:49,002 INFO L354 Elim1Store]: treesize reduction 55, result has 26.7 percent of original size [2021-11-21 00:56:49,002 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 335 treesize of output 315 [2021-11-21 00:57:29,803 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 00:57:29,813 INFO L354 Elim1Store]: treesize reduction 18, result has 47.1 percent of original size [2021-11-21 00:57:29,814 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 42 treesize of output 29 [2021-11-21 00:57:30,767 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:57:30,768 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 00:57:30,779 INFO L354 Elim1Store]: treesize reduction 18, result has 47.1 percent of original size [2021-11-21 00:57:30,779 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 42 treesize of output 29 [2021-11-21 00:57:32,482 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:57:32,483 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 00:57:32,493 INFO L354 Elim1Store]: treesize reduction 18, result has 47.1 percent of original size [2021-11-21 00:57:32,493 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 42 treesize of output 29 [2021-11-21 00:57:32,591 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 00:57:32,592 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 00:57:32,616 INFO L354 Elim1Store]: treesize reduction 32, result has 49.2 percent of original size [2021-11-21 00:57:32,617 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 23 treesize of output 42 [2021-11-21 00:57:32,733 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 00:57:32,734 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 00:57:32,767 INFO L354 Elim1Store]: treesize reduction 42, result has 49.4 percent of original size [2021-11-21 00:57:32,768 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 38 treesize of output 57 [2021-11-21 00:57:33,454 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 21 for LOIs [2021-11-21 00:57:33,476 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:57:34,010 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:57:34,010 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:57:34,010 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 25] total 72 [2021-11-21 00:57:34,010 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [821459622] [2021-11-21 00:57:34,011 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 00:57:34,013 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 72 states [2021-11-21 00:57:34,013 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:57:34,015 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 72 interpolants. [2021-11-21 00:57:34,017 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2526, Invalid=4116, Unknown=0, NotChecked=0, Total=6642 [2021-11-21 00:57:34,021 INFO L87 Difference]: Start difference. First operand 142 states and 209 transitions. Second operand has 72 states, 72 states have (on average 2.013888888888889) internal successors, (145), 72 states have internal predecessors, (145), 66 states have call successors, (198), 2 states have call predecessors, (198), 2 states have return successors, (198), 66 states have call predecessors, (198), 66 states have call successors, (198) [2021-11-21 00:57:36,294 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:57:36,294 INFO L93 Difference]: Finished difference Result 535 states and 723 transitions. [2021-11-21 00:57:36,295 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2021-11-21 00:57:36,295 INFO L78 Accepts]: Start accepts. Automaton has has 72 states, 72 states have (on average 2.013888888888889) internal successors, (145), 72 states have internal predecessors, (145), 66 states have call successors, (198), 2 states have call predecessors, (198), 2 states have return successors, (198), 66 states have call predecessors, (198), 66 states have call successors, (198) Word has length 270 [2021-11-21 00:57:36,297 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:57:36,301 INFO L225 Difference]: With dead ends: 535 [2021-11-21 00:57:36,301 INFO L226 Difference]: Without dead ends: 507 [2021-11-21 00:57:36,305 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 856 GetRequests, 753 SyntacticMatches, 0 SemanticMatches, 103 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4559 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=3746, Invalid=7174, Unknown=0, NotChecked=0, Total=10920 [2021-11-21 00:57:36,306 INFO L933 BasicCegarLoop]: 6 mSDtfsCounter, 1152 mSDsluCounter, 171 mSDsCounter, 0 mSdLazyCounter, 934 mSolverCounterSat, 836 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1155 SdHoareTripleChecker+Valid, 174 SdHoareTripleChecker+Invalid, 1770 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 836 IncrementalHoareTripleChecker+Valid, 934 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.1s IncrementalHoareTripleChecker+Time [2021-11-21 00:57:36,306 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1155 Valid, 174 Invalid, 1770 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [836 Valid, 934 Invalid, 0 Unknown, 0 Unchecked, 1.1s Time] [2021-11-21 00:57:36,307 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 507 states. [2021-11-21 00:57:36,342 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 507 to 286. [2021-11-21 00:57:36,344 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 286 states, 146 states have (on average 1.0205479452054795) internal successors, (149), 146 states have internal predecessors, (149), 138 states have call successors, (138), 1 states have call predecessors, (138), 1 states have return successors, (138), 138 states have call predecessors, (138), 138 states have call successors, (138) [2021-11-21 00:57:36,349 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 286 states to 286 states and 425 transitions. [2021-11-21 00:57:36,349 INFO L78 Accepts]: Start accepts. Automaton has 286 states and 425 transitions. Word has length 270 [2021-11-21 00:57:36,350 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:57:36,351 INFO L470 AbstractCegarLoop]: Abstraction has 286 states and 425 transitions. [2021-11-21 00:57:36,351 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 72 states, 72 states have (on average 2.013888888888889) internal successors, (145), 72 states have internal predecessors, (145), 66 states have call successors, (198), 2 states have call predecessors, (198), 2 states have return successors, (198), 66 states have call predecessors, (198), 66 states have call successors, (198) [2021-11-21 00:57:36,352 INFO L276 IsEmpty]: Start isEmpty. Operand 286 states and 425 transitions. [2021-11-21 00:57:36,367 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 559 [2021-11-21 00:57:36,368 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:57:36,368 INFO L514 BasicCegarLoop]: trace histogram [138, 46, 46, 46, 46, 46, 46, 46, 46, 46, 1, 1, 1, 1, 1, 1] [2021-11-21 00:57:36,403 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9d08ded-7547-46b1-b24a-3df4843ba7d0/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-21 00:57:36,593 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9d08ded-7547-46b1-b24a-3df4843ba7d0/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2021-11-21 00:57:36,594 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 00:57:36,594 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:57:36,594 INFO L85 PathProgramCache]: Analyzing trace with hash -117138373, now seen corresponding path program 5 times [2021-11-21 00:57:36,594 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:57:36,594 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [725870589] [2021-11-21 00:57:36,594 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:57:36,594 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:57:36,797 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:57:38,165 INFO L134 CoverageAnalysis]: Checked inductivity of 25208 backedges. 0 proven. 5221 refuted. 0 times theorem prover too weak. 19987 trivial. 0 not checked. [2021-11-21 00:57:38,165 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:57:38,165 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [725870589] [2021-11-21 00:57:38,165 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [725870589] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:57:38,166 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1778850020] [2021-11-21 00:57:38,166 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 00:57:38,166 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:57:38,166 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9d08ded-7547-46b1-b24a-3df4843ba7d0/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:57:38,167 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9d08ded-7547-46b1-b24a-3df4843ba7d0/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:57:38,183 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9d08ded-7547-46b1-b24a-3df4843ba7d0/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-21 01:00:20,445 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 24 check-sat command(s) [2021-11-21 01:00:20,445 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:00:20,567 INFO L263 TraceCheckSpWp]: Trace formula consists of 621 conjuncts, 49 conjunts are in the unsatisfiable core [2021-11-21 01:00:20,586 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:00:22,816 INFO L134 CoverageAnalysis]: Checked inductivity of 25208 backedges. 0 proven. 1081 refuted. 0 times theorem prover too weak. 24127 trivial. 0 not checked. [2021-11-21 01:00:22,816 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:00:26,358 INFO L134 CoverageAnalysis]: Checked inductivity of 25208 backedges. 0 proven. 1081 refuted. 0 times theorem prover too weak. 24127 trivial. 0 not checked. [2021-11-21 01:00:26,359 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1778850020] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:00:26,359 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1800021010] [2021-11-21 01:00:26,361 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-21 01:00:26,362 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:00:26,362 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:00:26,362 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:00:26,362 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:00:26,388 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:00:26,388 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:00:26,389 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:00:26,450 INFO L354 Elim1Store]: treesize reduction 140, result has 24.3 percent of original size [2021-11-21 01:00:26,451 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 8 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 34 treesize of output 66 [2021-11-21 01:00:26,509 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:00:26,511 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:00:26,513 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:00:26,514 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:00:26,515 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:00:26,589 INFO L354 Elim1Store]: treesize reduction 190, result has 19.1 percent of original size [2021-11-21 01:00:26,590 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 7 select indices, 7 select index equivalence classes, 12 disjoint index pairs (out of 21 index pairs), introduced 7 new quantified variables, introduced 15 case distinctions, treesize of input 60 treesize of output 93 [2021-11-21 01:00:28,457 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:00:28,458 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:00:28,463 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:00:28,466 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 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 57 treesize of output 45 [2021-11-21 01:00:33,408 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:00:33,410 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:00:33,413 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:00:33,415 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:00:33,416 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:00:33,417 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:00:33,417 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:00:33,419 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:00:33,420 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:00:33,462 INFO L354 Elim1Store]: treesize reduction 142, result has 12.3 percent of original size [2021-11-21 01:00:33,462 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 4 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 7 case distinctions, treesize of input 338 treesize of output 306 [2021-11-21 01:00:50,130 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:00:50,131 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:00:50,144 INFO L354 Elim1Store]: treesize reduction 18, result has 47.1 percent of original size [2021-11-21 01:00:50,144 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 42 treesize of output 29 [2021-11-21 01:00:51,653 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:00:51,654 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:00:51,666 INFO L354 Elim1Store]: treesize reduction 18, result has 47.1 percent of original size [2021-11-21 01:00:51,666 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 42 treesize of output 29 [2021-11-21 01:00:51,807 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:00:51,808 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:00:51,838 INFO L354 Elim1Store]: treesize reduction 32, result has 49.2 percent of original size [2021-11-21 01:00:51,839 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 23 treesize of output 42 [2021-11-21 01:00:51,986 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:00:51,987 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:00:52,019 INFO L354 Elim1Store]: treesize reduction 42, result has 49.4 percent of original size [2021-11-21 01:00:52,020 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 38 treesize of output 57 [2021-11-21 01:00:52,663 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 21 for LOIs [2021-11-21 01:00:52,692 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:00:53,335 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:00:53,337 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:00:53,338 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [49, 49, 50] total 145 [2021-11-21 01:00:53,338 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [137591309] [2021-11-21 01:00:53,338 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:00:53,343 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 145 states [2021-11-21 01:00:53,343 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:00:53,344 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 145 interpolants. [2021-11-21 01:00:53,350 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9690, Invalid=14180, Unknown=0, NotChecked=0, Total=23870 [2021-11-21 01:00:53,351 INFO L87 Difference]: Start difference. First operand 286 states and 425 transitions. Second operand has 145 states, 145 states have (on average 1.4) internal successors, (203), 145 states have internal predecessors, (203), 48 states have call successors, (144), 2 states have call predecessors, (144), 2 states have return successors, (144), 48 states have call predecessors, (144), 48 states have call successors, (144) [2021-11-21 01:01:01,283 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:01:01,283 INFO L93 Difference]: Finished difference Result 1087 states and 1467 transitions. [2021-11-21 01:01:01,283 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 97 states. [2021-11-21 01:01:01,284 INFO L78 Accepts]: Start accepts. Automaton has has 145 states, 145 states have (on average 1.4) internal successors, (203), 145 states have internal predecessors, (203), 48 states have call successors, (144), 2 states have call predecessors, (144), 2 states have return successors, (144), 48 states have call predecessors, (144), 48 states have call successors, (144) Word has length 558 [2021-11-21 01:01:01,285 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:01:01,294 INFO L225 Difference]: With dead ends: 1087 [2021-11-21 01:01:01,294 INFO L226 Difference]: Without dead ends: 1035 [2021-11-21 01:01:01,302 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1768 GetRequests, 1568 SyntacticMatches, 0 SemanticMatches, 200 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16328 ImplicationChecksByTransitivity, 7.3s TimeCoverageRelationStatistics Valid=14484, Invalid=26118, Unknown=0, NotChecked=0, Total=40602 [2021-11-21 01:01:01,303 INFO L933 BasicCegarLoop]: 6 mSDtfsCounter, 2573 mSDsluCounter, 351 mSDsCounter, 0 mSdLazyCounter, 2579 mSolverCounterSat, 2607 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2711 SdHoareTripleChecker+Valid, 351 SdHoareTripleChecker+Invalid, 5186 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2607 IncrementalHoareTripleChecker+Valid, 2579 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.6s IncrementalHoareTripleChecker+Time [2021-11-21 01:01:01,303 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2711 Valid, 351 Invalid, 5186 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2607 Valid, 2579 Invalid, 0 Unknown, 0 Unchecked, 2.6s Time] [2021-11-21 01:01:01,304 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1035 states. [2021-11-21 01:01:01,356 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1035 to 574. [2021-11-21 01:01:01,358 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 574 states, 290 states have (on average 1.0103448275862068) internal successors, (293), 290 states have internal predecessors, (293), 282 states have call successors, (282), 1 states have call predecessors, (282), 1 states have return successors, (282), 282 states have call predecessors, (282), 282 states have call successors, (282) [2021-11-21 01:01:01,366 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 574 states to 574 states and 857 transitions. [2021-11-21 01:01:01,366 INFO L78 Accepts]: Start accepts. Automaton has 574 states and 857 transitions. Word has length 558 [2021-11-21 01:01:01,369 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:01:01,369 INFO L470 AbstractCegarLoop]: Abstraction has 574 states and 857 transitions. [2021-11-21 01:01:01,370 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 145 states, 145 states have (on average 1.4) internal successors, (203), 145 states have internal predecessors, (203), 48 states have call successors, (144), 2 states have call predecessors, (144), 2 states have return successors, (144), 48 states have call predecessors, (144), 48 states have call successors, (144) [2021-11-21 01:01:01,370 INFO L276 IsEmpty]: Start isEmpty. Operand 574 states and 857 transitions. [2021-11-21 01:01:01,431 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1135 [2021-11-21 01:01:01,431 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:01:01,432 INFO L514 BasicCegarLoop]: trace histogram [282, 94, 94, 94, 94, 94, 94, 94, 94, 94, 1, 1, 1, 1, 1, 1] [2021-11-21 01:01:01,489 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9d08ded-7547-46b1-b24a-3df4843ba7d0/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Ended with exit code 0 [2021-11-21 01:01:01,632 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9d08ded-7547-46b1-b24a-3df4843ba7d0/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:01:01,632 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:01:01,633 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:01:01,633 INFO L85 PathProgramCache]: Analyzing trace with hash 1361933883, now seen corresponding path program 6 times [2021-11-21 01:01:01,633 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:01:01,633 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2136472410] [2021-11-21 01:01:01,633 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:01:01,633 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:01:02,032 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:01:06,009 INFO L134 CoverageAnalysis]: Checked inductivity of 105656 backedges. 0 proven. 21949 refuted. 0 times theorem prover too weak. 83707 trivial. 0 not checked. [2021-11-21 01:01:06,009 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:01:06,009 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2136472410] [2021-11-21 01:01:06,010 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2136472410] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:01:06,010 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1441438202] [2021-11-21 01:01:06,010 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-21 01:01:06,010 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:01:06,010 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9d08ded-7547-46b1-b24a-3df4843ba7d0/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:01:06,030 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9d08ded-7547-46b1-b24a-3df4843ba7d0/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:01:06,031 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9d08ded-7547-46b1-b24a-3df4843ba7d0/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process