./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/loops/string-1.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 53f42b1a Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7bc8bb1-d703-4dba-9aca-f4b274a5fe95/bin/utaipan-TEXQjIfE4P/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7bc8bb1-d703-4dba-9aca-f4b274a5fe95/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_f7bc8bb1-d703-4dba-9aca-f4b274a5fe95/bin/utaipan-TEXQjIfE4P/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7bc8bb1-d703-4dba-9aca-f4b274a5fe95/bin/utaipan-TEXQjIfE4P/config/TaipanReach.xml -i ../../sv-benchmarks/c/loops/string-1.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7bc8bb1-d703-4dba-9aca-f4b274a5fe95/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_f7bc8bb1-d703-4dba-9aca-f4b274a5fe95/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 7c71ebd98a3b6e7de0397eeeb86fda8d96b2d4c8ea0b8e1766ce392ff80613de --- Real Ultimate output --- This is Ultimate 0.2.1-dev-53f42b1 [2021-11-20 22:48:14,187 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-20 22:48:14,189 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-20 22:48:14,222 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-20 22:48:14,223 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-20 22:48:14,224 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-20 22:48:14,226 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-20 22:48:14,228 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-20 22:48:14,231 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-20 22:48:14,232 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-20 22:48:14,233 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-20 22:48:14,234 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-20 22:48:14,235 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-20 22:48:14,236 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-20 22:48:14,238 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-20 22:48:14,240 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-20 22:48:14,241 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-20 22:48:14,243 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-20 22:48:14,245 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-20 22:48:14,248 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-20 22:48:14,250 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-20 22:48:14,252 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-20 22:48:14,253 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-20 22:48:14,254 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-20 22:48:14,258 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-20 22:48:14,259 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-20 22:48:14,259 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-20 22:48:14,260 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-20 22:48:14,261 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-20 22:48:14,262 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-20 22:48:14,263 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-20 22:48:14,264 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-20 22:48:14,266 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-20 22:48:14,267 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-20 22:48:14,269 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-20 22:48:14,270 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-20 22:48:14,272 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-20 22:48:14,273 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-20 22:48:14,273 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-20 22:48:14,274 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-20 22:48:14,275 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-20 22:48:14,276 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7bc8bb1-d703-4dba-9aca-f4b274a5fe95/bin/utaipan-TEXQjIfE4P/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-20 22:48:14,320 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-20 22:48:14,320 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-20 22:48:14,321 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-20 22:48:14,321 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-20 22:48:14,322 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-20 22:48:14,322 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-20 22:48:14,322 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-20 22:48:14,323 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-20 22:48:14,323 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-20 22:48:14,323 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-20 22:48:14,324 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-20 22:48:14,324 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-20 22:48:14,325 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-20 22:48:14,325 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-20 22:48:14,325 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-20 22:48:14,325 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-20 22:48:14,326 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-20 22:48:14,326 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-20 22:48:14,327 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-20 22:48:14,327 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-20 22:48:14,327 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-20 22:48:14,327 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-20 22:48:14,328 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-20 22:48:14,328 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-20 22:48:14,328 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-20 22:48:14,328 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-20 22:48:14,330 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-20 22:48:14,330 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-20 22:48:14,331 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-20 22:48:14,331 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-20 22:48:14,331 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-20 22:48:14,331 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-20 22:48:14,332 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-20 22:48:14,332 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-20 22:48:14,332 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-20 22:48:14,332 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-20 22:48:14,333 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-20 22:48:14,333 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-20 22:48:14,333 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-20 22:48:14,333 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-20 22:48:14,334 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-20 22:48:14,334 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_f7bc8bb1-d703-4dba-9aca-f4b274a5fe95/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7bc8bb1-d703-4dba-9aca-f4b274a5fe95/bin/utaipan-TEXQjIfE4P Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 7c71ebd98a3b6e7de0397eeeb86fda8d96b2d4c8ea0b8e1766ce392ff80613de [2021-11-20 22:48:14,631 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-20 22:48:14,656 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-20 22:48:14,659 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-20 22:48:14,660 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-20 22:48:14,661 INFO L275 PluginConnector]: CDTParser initialized [2021-11-20 22:48:14,663 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7bc8bb1-d703-4dba-9aca-f4b274a5fe95/bin/utaipan-TEXQjIfE4P/../../sv-benchmarks/c/loops/string-1.i [2021-11-20 22:48:14,749 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7bc8bb1-d703-4dba-9aca-f4b274a5fe95/bin/utaipan-TEXQjIfE4P/data/c73e7a73d/2bd32de77eac4071abd1826f18d4f1a3/FLAGbf435fe21 [2021-11-20 22:48:15,285 INFO L306 CDTParser]: Found 1 translation units. [2021-11-20 22:48:15,286 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7bc8bb1-d703-4dba-9aca-f4b274a5fe95/sv-benchmarks/c/loops/string-1.i [2021-11-20 22:48:15,292 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7bc8bb1-d703-4dba-9aca-f4b274a5fe95/bin/utaipan-TEXQjIfE4P/data/c73e7a73d/2bd32de77eac4071abd1826f18d4f1a3/FLAGbf435fe21 [2021-11-20 22:48:15,685 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7bc8bb1-d703-4dba-9aca-f4b274a5fe95/bin/utaipan-TEXQjIfE4P/data/c73e7a73d/2bd32de77eac4071abd1826f18d4f1a3 [2021-11-20 22:48:15,687 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-20 22:48:15,690 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-20 22:48:15,691 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-20 22:48:15,691 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-20 22:48:15,696 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-20 22:48:15,696 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.11 10:48:15" (1/1) ... [2021-11-20 22:48:15,697 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@5b015298 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 10:48:15, skipping insertion in model container [2021-11-20 22:48:15,698 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.11 10:48:15" (1/1) ... [2021-11-20 22:48:15,706 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-20 22:48:15,722 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-20 22:48:15,881 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_f7bc8bb1-d703-4dba-9aca-f4b274a5fe95/sv-benchmarks/c/loops/string-1.i[896,909] [2021-11-20 22:48:15,900 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-20 22:48:15,906 INFO L203 MainTranslator]: Completed pre-run [2021-11-20 22:48:15,916 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_f7bc8bb1-d703-4dba-9aca-f4b274a5fe95/sv-benchmarks/c/loops/string-1.i[896,909] [2021-11-20 22:48:15,926 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-20 22:48:15,940 INFO L208 MainTranslator]: Completed translation [2021-11-20 22:48:15,940 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 10:48:15 WrapperNode [2021-11-20 22:48:15,940 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-20 22:48:15,942 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-20 22:48:15,942 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-20 22:48:15,942 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-20 22:48:15,950 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 10:48:15" (1/1) ... [2021-11-20 22:48:15,958 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 10:48:15" (1/1) ... [2021-11-20 22:48:15,981 INFO L137 Inliner]: procedures = 17, calls = 27, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 126 [2021-11-20 22:48:15,981 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-20 22:48:15,982 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-20 22:48:15,982 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-20 22:48:15,983 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-20 22:48:15,991 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 10:48:15" (1/1) ... [2021-11-20 22:48:15,991 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 10:48:15" (1/1) ... [2021-11-20 22:48:15,994 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 10:48:15" (1/1) ... [2021-11-20 22:48:15,994 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 10:48:15" (1/1) ... [2021-11-20 22:48:16,001 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 10:48:15" (1/1) ... [2021-11-20 22:48:16,005 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 10:48:15" (1/1) ... [2021-11-20 22:48:16,007 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 10:48:15" (1/1) ... [2021-11-20 22:48:16,010 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-20 22:48:16,010 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-20 22:48:16,011 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-20 22:48:16,011 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-20 22:48:16,012 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 10:48:15" (1/1) ... [2021-11-20 22:48:16,020 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-20 22:48:16,031 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7bc8bb1-d703-4dba-9aca-f4b274a5fe95/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 22:48:16,043 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7bc8bb1-d703-4dba-9aca-f4b274a5fe95/bin/utaipan-TEXQjIfE4P/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-20 22:48:16,052 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7bc8bb1-d703-4dba-9aca-f4b274a5fe95/bin/utaipan-TEXQjIfE4P/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-20 22:48:16,085 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-20 22:48:16,086 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-20 22:48:16,086 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-11-20 22:48:16,086 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-11-20 22:48:16,086 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-20 22:48:16,086 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-20 22:48:16,086 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-11-20 22:48:16,086 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-11-20 22:48:16,143 INFO L236 CfgBuilder]: Building ICFG [2021-11-20 22:48:16,144 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-20 22:48:16,333 INFO L277 CfgBuilder]: Performing block encoding [2021-11-20 22:48:16,407 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-20 22:48:16,408 INFO L301 CfgBuilder]: Removed 5 assume(true) statements. [2021-11-20 22:48:16,410 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.11 10:48:16 BoogieIcfgContainer [2021-11-20 22:48:16,410 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-20 22:48:16,412 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-20 22:48:16,412 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-20 22:48:16,416 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-20 22:48:16,416 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.11 10:48:15" (1/3) ... [2021-11-20 22:48:16,423 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6ac02641 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.11 10:48:16, skipping insertion in model container [2021-11-20 22:48:16,423 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 10:48:15" (2/3) ... [2021-11-20 22:48:16,424 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6ac02641 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.11 10:48:16, skipping insertion in model container [2021-11-20 22:48:16,424 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.11 10:48:16" (3/3) ... [2021-11-20 22:48:16,425 INFO L111 eAbstractionObserver]: Analyzing ICFG string-1.i [2021-11-20 22:48:16,431 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-20 22:48:16,431 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-20 22:48:16,479 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-20 22:48:16,486 INFO L339 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mLoopAccelerationTechnique=FAST_UPR [2021-11-20 22:48:16,486 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-20 22:48:16,522 INFO L276 IsEmpty]: Start isEmpty. Operand has 18 states, 16 states have (on average 1.75) internal successors, (28), 17 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 22:48:16,527 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-11-20 22:48:16,527 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 22:48:16,528 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 22:48:16,528 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 22:48:16,533 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 22:48:16,533 INFO L85 PathProgramCache]: Analyzing trace with hash -431386043, now seen corresponding path program 1 times [2021-11-20 22:48:16,542 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 22:48:16,542 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [756060000] [2021-11-20 22:48:16,542 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 22:48:16,543 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 22:48:16,625 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 22:48:16,686 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 22:48:16,687 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 22:48:16,687 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [756060000] [2021-11-20 22:48:16,688 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [756060000] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 22:48:16,688 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 22:48:16,689 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-20 22:48:16,690 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [857430628] [2021-11-20 22:48:16,691 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 22:48:16,695 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-20 22:48:16,696 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 22:48:16,731 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-20 22:48:16,732 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-20 22:48:16,734 INFO L87 Difference]: Start difference. First operand has 18 states, 16 states have (on average 1.75) internal successors, (28), 17 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 3 states, 3 states have (on average 4.0) internal successors, (12), 2 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 22:48:16,789 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 22:48:16,789 INFO L93 Difference]: Finished difference Result 43 states and 65 transitions. [2021-11-20 22:48:16,790 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-20 22:48:16,792 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 4.0) internal successors, (12), 2 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 12 [2021-11-20 22:48:16,792 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 22:48:16,799 INFO L225 Difference]: With dead ends: 43 [2021-11-20 22:48:16,799 INFO L226 Difference]: Without dead ends: 21 [2021-11-20 22:48:16,802 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-20 22:48:16,806 INFO L933 BasicCegarLoop]: 17 mSDtfsCounter, 6 mSDsluCounter, 16 mSDsCounter, 0 mSdLazyCounter, 16 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 32 SdHoareTripleChecker+Invalid, 19 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 16 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-20 22:48:16,807 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [6 Valid, 32 Invalid, 19 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 16 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-20 22:48:16,824 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2021-11-20 22:48:16,836 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 17. [2021-11-20 22:48:16,837 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17 states, 16 states have (on average 1.3125) internal successors, (21), 16 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 22:48:16,838 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 21 transitions. [2021-11-20 22:48:16,839 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 21 transitions. Word has length 12 [2021-11-20 22:48:16,840 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 22:48:16,840 INFO L470 AbstractCegarLoop]: Abstraction has 17 states and 21 transitions. [2021-11-20 22:48:16,840 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 4.0) internal successors, (12), 2 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 22:48:16,840 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 21 transitions. [2021-11-20 22:48:16,841 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2021-11-20 22:48:16,841 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 22:48:16,841 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 22:48:16,842 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-20 22:48:16,842 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 22:48:16,843 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 22:48:16,843 INFO L85 PathProgramCache]: Analyzing trace with hash 1062173536, now seen corresponding path program 1 times [2021-11-20 22:48:16,843 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 22:48:16,844 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1240948525] [2021-11-20 22:48:16,844 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 22:48:16,844 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 22:48:16,862 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 22:48:16,893 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-20 22:48:16,893 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 22:48:16,893 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1240948525] [2021-11-20 22:48:16,894 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1240948525] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 22:48:16,894 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [486092865] [2021-11-20 22:48:16,894 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 22:48:16,895 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 22:48:16,895 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7bc8bb1-d703-4dba-9aca-f4b274a5fe95/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 22:48:16,897 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7bc8bb1-d703-4dba-9aca-f4b274a5fe95/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 22:48:16,899 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7bc8bb1-d703-4dba-9aca-f4b274a5fe95/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-20 22:48:16,959 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 22:48:16,961 INFO L263 TraceCheckSpWp]: Trace formula consists of 90 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-20 22:48:16,966 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 22:48:17,033 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-20 22:48:17,033 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 22:48:17,091 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-20 22:48:17,091 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [486092865] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 22:48:17,092 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [228176792] [2021-11-20 22:48:17,113 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-20 22:48:17,113 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 22:48:17,119 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 22:48:17,125 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 22:48:17,126 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 22:48:17,240 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 22:48:17,243 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 22:48:17,314 INFO L354 Elim1Store]: treesize reduction 60, result has 24.1 percent of original size [2021-11-20 22:48:17,315 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 39 treesize of output 53 [2021-11-20 22:48:17,388 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 22:48:17,389 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 22:48:17,393 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 7 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 27 [2021-11-20 22:48:17,496 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 22:48:17,500 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 37 treesize of output 39 [2021-11-20 22:48:17,788 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 22:48:17,825 INFO L354 Elim1Store]: treesize reduction 90, result has 14.3 percent of original size [2021-11-20 22:48:17,826 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 240 treesize of output 230 [2021-11-20 22:48:18,134 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 22:48:18,344 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 22:48:18,346 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 29 treesize of output 28 [2021-11-20 22:48:18,460 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 22:48:18,484 INFO L354 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2021-11-20 22:48:18,485 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 3 case distinctions, treesize of input 66 treesize of output 62 [2021-11-20 22:48:18,636 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 22:48:19,280 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 22:48:19,807 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSifa [228176792] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 22:48:19,808 INFO L186 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2021-11-20 22:48:19,808 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [12] imperfect sequences [3, 3, 3] total 16 [2021-11-20 22:48:19,809 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [899351051] [2021-11-20 22:48:19,809 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 22:48:19,811 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2021-11-20 22:48:19,811 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 22:48:19,811 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-11-20 22:48:19,814 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=64, Invalid=208, Unknown=0, NotChecked=0, Total=272 [2021-11-20 22:48:19,814 INFO L87 Difference]: Start difference. First operand 17 states and 21 transitions. Second operand has 13 states, 13 states have (on average 1.2307692307692308) internal successors, (16), 12 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 22:48:19,984 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 22:48:19,984 INFO L93 Difference]: Finished difference Result 33 states and 42 transitions. [2021-11-20 22:48:19,990 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-11-20 22:48:19,991 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 1.2307692307692308) internal successors, (16), 12 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 16 [2021-11-20 22:48:19,992 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 22:48:19,994 INFO L225 Difference]: With dead ends: 33 [2021-11-20 22:48:19,994 INFO L226 Difference]: Without dead ends: 26 [2021-11-20 22:48:19,995 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 34 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 62 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=64, Invalid=208, Unknown=0, NotChecked=0, Total=272 [2021-11-20 22:48:20,003 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 19 mSDsluCounter, 17 mSDsCounter, 0 mSdLazyCounter, 118 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 19 SdHoareTripleChecker+Valid, 20 SdHoareTripleChecker+Invalid, 128 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 118 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-20 22:48:20,004 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [19 Valid, 20 Invalid, 128 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 118 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-20 22:48:20,007 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2021-11-20 22:48:20,017 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 22. [2021-11-20 22:48:20,018 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22 states, 21 states have (on average 1.2857142857142858) internal successors, (27), 21 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 22:48:20,020 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 27 transitions. [2021-11-20 22:48:20,020 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 27 transitions. Word has length 16 [2021-11-20 22:48:20,021 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 22:48:20,021 INFO L470 AbstractCegarLoop]: Abstraction has 22 states and 27 transitions. [2021-11-20 22:48:20,021 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 1.2307692307692308) internal successors, (16), 12 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 22:48:20,021 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 27 transitions. [2021-11-20 22:48:20,022 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2021-11-20 22:48:20,023 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 22:48:20,023 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 22:48:20,061 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7bc8bb1-d703-4dba-9aca-f4b274a5fe95/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-20 22:48:20,238 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7bc8bb1-d703-4dba-9aca-f4b274a5fe95/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 22:48:20,239 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 22:48:20,240 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 22:48:20,240 INFO L85 PathProgramCache]: Analyzing trace with hash -96510459, now seen corresponding path program 1 times [2021-11-20 22:48:20,240 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 22:48:20,240 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1331461179] [2021-11-20 22:48:20,240 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 22:48:20,240 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 22:48:20,266 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 22:48:20,300 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-20 22:48:20,300 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 22:48:20,300 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1331461179] [2021-11-20 22:48:20,300 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1331461179] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 22:48:20,301 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [880033469] [2021-11-20 22:48:20,301 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 22:48:20,301 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 22:48:20,301 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7bc8bb1-d703-4dba-9aca-f4b274a5fe95/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 22:48:20,302 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7bc8bb1-d703-4dba-9aca-f4b274a5fe95/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 22:48:20,322 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7bc8bb1-d703-4dba-9aca-f4b274a5fe95/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-20 22:48:20,353 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 22:48:20,355 INFO L263 TraceCheckSpWp]: Trace formula consists of 95 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-20 22:48:20,356 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 22:48:20,395 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-20 22:48:20,395 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 22:48:20,453 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-20 22:48:20,454 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [880033469] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 22:48:20,454 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1178248287] [2021-11-20 22:48:20,468 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-20 22:48:20,468 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 22:48:20,468 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 22:48:20,469 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 22:48:20,469 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 22:48:20,506 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 22:48:20,507 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 22:48:20,534 INFO L354 Elim1Store]: treesize reduction 37, result has 32.7 percent of original size [2021-11-20 22:48:20,535 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 20 treesize of output 34 [2021-11-20 22:48:20,566 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 22:48:20,568 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 22:48:20,569 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 22:48:20,604 INFO L354 Elim1Store]: treesize reduction 60, result has 24.1 percent of original size [2021-11-20 22:48:20,605 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 39 treesize of output 53 [2021-11-20 22:48:20,734 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 22:48:20,735 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 34 treesize of output 36 [2021-11-20 22:48:20,816 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 22:48:20,849 INFO L354 Elim1Store]: treesize reduction 86, result has 23.2 percent of original size [2021-11-20 22:48:20,849 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 5 case distinctions, treesize of input 234 treesize of output 231 [2021-11-20 22:48:21,337 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 22:48:21,471 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 22:48:21,472 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 29 treesize of output 28 [2021-11-20 22:48:21,539 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 22:48:21,558 INFO L354 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2021-11-20 22:48:21,559 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 3 case distinctions, treesize of input 66 treesize of output 62 [2021-11-20 22:48:21,675 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 22:48:22,699 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 22:48:23,179 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSifa [1178248287] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 22:48:23,180 INFO L186 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2021-11-20 22:48:23,180 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [12] imperfect sequences [3, 3, 3] total 16 [2021-11-20 22:48:23,180 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1441152772] [2021-11-20 22:48:23,180 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 22:48:23,181 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2021-11-20 22:48:23,181 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 22:48:23,181 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-11-20 22:48:23,182 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=214, Unknown=0, NotChecked=0, Total=272 [2021-11-20 22:48:23,182 INFO L87 Difference]: Start difference. First operand 22 states and 27 transitions. Second operand has 13 states, 13 states have (on average 1.3076923076923077) internal successors, (17), 12 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 22:48:23,465 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 22:48:23,465 INFO L93 Difference]: Finished difference Result 32 states and 40 transitions. [2021-11-20 22:48:23,466 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-11-20 22:48:23,466 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 1.3076923076923077) internal successors, (17), 12 states have internal predecessors, (17), 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 18 [2021-11-20 22:48:23,466 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 22:48:23,467 INFO L225 Difference]: With dead ends: 32 [2021-11-20 22:48:23,467 INFO L226 Difference]: Without dead ends: 20 [2021-11-20 22:48:23,467 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 40 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 77 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=80, Invalid=300, Unknown=0, NotChecked=0, Total=380 [2021-11-20 22:48:23,468 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 13 mSDsluCounter, 29 mSDsCounter, 0 mSdLazyCounter, 149 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 13 SdHoareTripleChecker+Valid, 32 SdHoareTripleChecker+Invalid, 158 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 149 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-20 22:48:23,469 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [13 Valid, 32 Invalid, 158 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 149 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-20 22:48:23,469 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2021-11-20 22:48:23,472 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 19. [2021-11-20 22:48:23,472 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19 states, 18 states have (on average 1.2777777777777777) internal successors, (23), 18 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 22:48:23,473 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 23 transitions. [2021-11-20 22:48:23,473 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 23 transitions. Word has length 18 [2021-11-20 22:48:23,473 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 22:48:23,473 INFO L470 AbstractCegarLoop]: Abstraction has 19 states and 23 transitions. [2021-11-20 22:48:23,474 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 1.3076923076923077) internal successors, (17), 12 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 22:48:23,474 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 23 transitions. [2021-11-20 22:48:23,474 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2021-11-20 22:48:23,474 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 22:48:23,474 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 22:48:23,511 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7bc8bb1-d703-4dba-9aca-f4b274a5fe95/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Ended with exit code 0 [2021-11-20 22:48:23,686 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7bc8bb1-d703-4dba-9aca-f4b274a5fe95/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 22:48:23,687 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 22:48:23,687 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 22:48:23,687 INFO L85 PathProgramCache]: Analyzing trace with hash 616504091, now seen corresponding path program 1 times [2021-11-20 22:48:23,687 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 22:48:23,688 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1294713935] [2021-11-20 22:48:23,688 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 22:48:23,688 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 22:48:23,698 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 22:48:23,723 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-20 22:48:23,723 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 22:48:23,723 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1294713935] [2021-11-20 22:48:23,724 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1294713935] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 22:48:23,724 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [79681707] [2021-11-20 22:48:23,724 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 22:48:23,724 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 22:48:23,724 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7bc8bb1-d703-4dba-9aca-f4b274a5fe95/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 22:48:23,735 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7bc8bb1-d703-4dba-9aca-f4b274a5fe95/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 22:48:23,752 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7bc8bb1-d703-4dba-9aca-f4b274a5fe95/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-20 22:48:23,794 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 22:48:23,794 INFO L263 TraceCheckSpWp]: Trace formula consists of 95 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-20 22:48:23,796 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 22:48:23,828 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-20 22:48:23,828 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 22:48:23,873 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-20 22:48:23,874 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [79681707] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 22:48:23,874 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1403535291] [2021-11-20 22:48:23,877 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-20 22:48:23,877 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 22:48:23,877 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 22:48:23,877 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 22:48:23,878 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 22:48:23,923 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 22:48:23,924 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 22:48:23,947 INFO L354 Elim1Store]: treesize reduction 37, result has 32.7 percent of original size [2021-11-20 22:48:23,948 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 20 treesize of output 34 [2021-11-20 22:48:23,975 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 22:48:23,976 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 22:48:23,978 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 22:48:23,979 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 22:48:24,023 INFO L354 Elim1Store]: treesize reduction 60, result has 24.1 percent of original size [2021-11-20 22:48:24,024 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 39 treesize of output 53 [2021-11-20 22:48:24,100 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 22:48:24,102 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 34 treesize of output 36 [2021-11-20 22:48:24,252 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 22:48:24,281 INFO L354 Elim1Store]: treesize reduction 86, result has 23.2 percent of original size [2021-11-20 22:48:24,282 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 5 case distinctions, treesize of input 234 treesize of output 231 [2021-11-20 22:48:24,662 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 22:48:24,823 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 22:48:24,824 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 32 treesize of output 31 [2021-11-20 22:48:24,901 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 22:48:24,904 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 22:48:24,917 INFO L354 Elim1Store]: treesize reduction 37, result has 19.6 percent of original size [2021-11-20 22:48:24,917 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 72 treesize of output 61 [2021-11-20 22:48:25,019 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 22:48:25,902 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 22:48:26,254 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSifa [1403535291] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 22:48:26,254 INFO L186 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2021-11-20 22:48:26,255 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [12] imperfect sequences [3, 3, 3] total 16 [2021-11-20 22:48:26,255 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1455589317] [2021-11-20 22:48:26,255 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 22:48:26,255 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2021-11-20 22:48:26,255 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 22:48:26,256 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-11-20 22:48:26,256 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=64, Invalid=208, Unknown=0, NotChecked=0, Total=272 [2021-11-20 22:48:26,256 INFO L87 Difference]: Start difference. First operand 19 states and 23 transitions. Second operand has 13 states, 13 states have (on average 1.3076923076923077) internal successors, (17), 12 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 22:48:26,345 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 22:48:26,345 INFO L93 Difference]: Finished difference Result 29 states and 36 transitions. [2021-11-20 22:48:26,345 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-11-20 22:48:26,345 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 1.3076923076923077) internal successors, (17), 12 states have internal predecessors, (17), 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 18 [2021-11-20 22:48:26,346 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 22:48:26,346 INFO L225 Difference]: With dead ends: 29 [2021-11-20 22:48:26,346 INFO L226 Difference]: Without dead ends: 22 [2021-11-20 22:48:26,347 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 40 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 62 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=64, Invalid=208, Unknown=0, NotChecked=0, Total=272 [2021-11-20 22:48:26,347 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 10 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 113 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 15 SdHoareTripleChecker+Invalid, 123 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 113 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-20 22:48:26,348 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [10 Valid, 15 Invalid, 123 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 113 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-20 22:48:26,349 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2021-11-20 22:48:26,352 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 21. [2021-11-20 22:48:26,352 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21 states, 20 states have (on average 1.25) internal successors, (25), 20 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 22:48:26,352 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 25 transitions. [2021-11-20 22:48:26,353 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 25 transitions. Word has length 18 [2021-11-20 22:48:26,353 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 22:48:26,353 INFO L470 AbstractCegarLoop]: Abstraction has 21 states and 25 transitions. [2021-11-20 22:48:26,353 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 1.3076923076923077) internal successors, (17), 12 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 22:48:26,353 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 25 transitions. [2021-11-20 22:48:26,354 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2021-11-20 22:48:26,354 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 22:48:26,354 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 22:48:26,374 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7bc8bb1-d703-4dba-9aca-f4b274a5fe95/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Ended with exit code 0 [2021-11-20 22:48:26,558 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7bc8bb1-d703-4dba-9aca-f4b274a5fe95/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 22:48:26,559 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 22:48:26,559 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 22:48:26,559 INFO L85 PathProgramCache]: Analyzing trace with hash 1111882496, now seen corresponding path program 1 times [2021-11-20 22:48:26,559 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 22:48:26,560 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1417482378] [2021-11-20 22:48:26,560 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 22:48:26,560 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 22:48:26,568 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 22:48:26,596 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-11-20 22:48:26,596 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 22:48:26,596 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1417482378] [2021-11-20 22:48:26,596 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1417482378] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 22:48:26,596 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [435697417] [2021-11-20 22:48:26,596 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 22:48:26,597 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 22:48:26,597 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7bc8bb1-d703-4dba-9aca-f4b274a5fe95/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 22:48:26,607 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7bc8bb1-d703-4dba-9aca-f4b274a5fe95/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 22:48:26,608 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7bc8bb1-d703-4dba-9aca-f4b274a5fe95/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-20 22:48:26,642 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 22:48:26,642 INFO L263 TraceCheckSpWp]: Trace formula consists of 100 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-20 22:48:26,644 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 22:48:26,675 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-11-20 22:48:26,675 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 22:48:26,716 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-11-20 22:48:26,716 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [435697417] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 22:48:26,716 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1728910692] [2021-11-20 22:48:26,718 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-20 22:48:26,718 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 22:48:26,719 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 22:48:26,719 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 22:48:26,719 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 22:48:26,741 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 22:48:26,742 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 22:48:26,763 INFO L354 Elim1Store]: treesize reduction 37, result has 32.7 percent of original size [2021-11-20 22:48:26,763 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 20 treesize of output 34 [2021-11-20 22:48:26,788 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 22:48:26,789 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 22:48:26,790 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 22:48:26,814 INFO L354 Elim1Store]: treesize reduction 60, result has 24.1 percent of original size [2021-11-20 22:48:26,814 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 39 treesize of output 53 [2021-11-20 22:48:26,945 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 22:48:26,946 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 34 treesize of output 36 [2021-11-20 22:48:27,018 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 22:48:27,049 INFO L354 Elim1Store]: treesize reduction 86, result has 23.2 percent of original size [2021-11-20 22:48:27,049 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 5 case distinctions, treesize of input 234 treesize of output 231 [2021-11-20 22:48:27,432 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 22:48:27,548 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 22:48:27,548 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 32 treesize of output 31 [2021-11-20 22:48:27,631 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 22:48:27,634 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 22:48:27,644 INFO L354 Elim1Store]: treesize reduction 37, result has 19.6 percent of original size [2021-11-20 22:48:27,645 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 72 treesize of output 61 [2021-11-20 22:48:27,712 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 22:48:28,802 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 22:48:29,166 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSifa [1728910692] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 22:48:29,167 INFO L186 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2021-11-20 22:48:29,167 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [12] imperfect sequences [3, 3, 3] total 16 [2021-11-20 22:48:29,167 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1107642849] [2021-11-20 22:48:29,167 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 22:48:29,167 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2021-11-20 22:48:29,168 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 22:48:29,168 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-11-20 22:48:29,168 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=61, Invalid=211, Unknown=0, NotChecked=0, Total=272 [2021-11-20 22:48:29,168 INFO L87 Difference]: Start difference. First operand 21 states and 25 transitions. Second operand has 13 states, 13 states have (on average 1.3846153846153846) internal successors, (18), 12 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 22:48:29,408 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 22:48:29,408 INFO L93 Difference]: Finished difference Result 26 states and 31 transitions. [2021-11-20 22:48:29,409 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-11-20 22:48:29,409 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 1.3846153846153846) internal successors, (18), 12 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2021-11-20 22:48:29,410 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 22:48:29,410 INFO L225 Difference]: With dead ends: 26 [2021-11-20 22:48:29,410 INFO L226 Difference]: Without dead ends: 23 [2021-11-20 22:48:29,411 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 64 GetRequests, 46 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 72 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=83, Invalid=297, Unknown=0, NotChecked=0, Total=380 [2021-11-20 22:48:29,412 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 8 mSDsluCounter, 18 mSDsCounter, 0 mSdLazyCounter, 160 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8 SdHoareTripleChecker+Valid, 21 SdHoareTripleChecker+Invalid, 170 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 160 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-20 22:48:29,412 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [8 Valid, 21 Invalid, 170 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 160 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-20 22:48:29,413 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2021-11-20 22:48:29,416 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 22. [2021-11-20 22:48:29,416 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22 states, 21 states have (on average 1.2380952380952381) internal successors, (26), 21 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 22:48:29,424 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 26 transitions. [2021-11-20 22:48:29,424 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 26 transitions. Word has length 20 [2021-11-20 22:48:29,424 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 22:48:29,424 INFO L470 AbstractCegarLoop]: Abstraction has 22 states and 26 transitions. [2021-11-20 22:48:29,425 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 1.3846153846153846) internal successors, (18), 12 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 22:48:29,425 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 26 transitions. [2021-11-20 22:48:29,425 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-11-20 22:48:29,426 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 22:48:29,426 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 22:48:29,463 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7bc8bb1-d703-4dba-9aca-f4b274a5fe95/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-20 22:48:29,638 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7bc8bb1-d703-4dba-9aca-f4b274a5fe95/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 22:48:29,639 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 22:48:29,639 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 22:48:29,640 INFO L85 PathProgramCache]: Analyzing trace with hash 108814125, now seen corresponding path program 1 times [2021-11-20 22:48:29,640 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 22:48:29,640 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [256263169] [2021-11-20 22:48:29,640 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 22:48:29,640 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 22:48:29,648 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 22:48:29,680 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-20 22:48:29,680 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 22:48:29,680 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [256263169] [2021-11-20 22:48:29,680 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [256263169] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 22:48:29,680 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2105272714] [2021-11-20 22:48:29,681 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 22:48:29,681 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 22:48:29,681 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7bc8bb1-d703-4dba-9aca-f4b274a5fe95/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 22:48:29,682 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7bc8bb1-d703-4dba-9aca-f4b274a5fe95/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 22:48:29,682 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7bc8bb1-d703-4dba-9aca-f4b274a5fe95/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-20 22:48:29,725 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 22:48:29,725 INFO L263 TraceCheckSpWp]: Trace formula consists of 103 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-20 22:48:29,727 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 22:48:29,757 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-20 22:48:29,757 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 22:48:29,802 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-20 22:48:29,802 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2105272714] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 22:48:29,802 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [258770115] [2021-11-20 22:48:29,805 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-20 22:48:29,805 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 22:48:29,805 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 22:48:29,805 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 22:48:29,806 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 22:48:29,825 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 22:48:29,831 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 22:48:29,861 INFO L354 Elim1Store]: treesize reduction 60, result has 24.1 percent of original size [2021-11-20 22:48:29,862 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 7 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 6 case distinctions, treesize of input 39 treesize of output 53 [2021-11-20 22:48:29,897 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 22:48:29,898 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 22:48:29,899 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 7 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 27 [2021-11-20 22:48:29,969 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 22:48:29,970 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 37 treesize of output 39 [2021-11-20 22:48:30,047 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 22:48:30,078 INFO L354 Elim1Store]: treesize reduction 90, result has 14.3 percent of original size [2021-11-20 22:48:30,079 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 240 treesize of output 230 [2021-11-20 22:48:30,300 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 22:48:30,383 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 22:48:30,384 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 29 treesize of output 28 [2021-11-20 22:48:30,449 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 22:48:30,476 INFO L354 Elim1Store]: treesize reduction 54, result has 28.0 percent of original size [2021-11-20 22:48:30,478 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 3 case distinctions, treesize of input 66 treesize of output 62 [2021-11-20 22:48:30,558 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 22:48:32,777 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 22:48:33,107 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSifa [258770115] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 22:48:33,107 INFO L186 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2021-11-20 22:48:33,107 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [12] imperfect sequences [3, 3, 3] total 16 [2021-11-20 22:48:33,108 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1897997456] [2021-11-20 22:48:33,108 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 22:48:33,108 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2021-11-20 22:48:33,108 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 22:48:33,109 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-11-20 22:48:33,109 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=217, Unknown=0, NotChecked=0, Total=272 [2021-11-20 22:48:33,109 INFO L87 Difference]: Start difference. First operand 22 states and 26 transitions. Second operand has 13 states, 13 states have (on average 1.4615384615384615) internal successors, (19), 12 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 22:48:33,343 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 22:48:33,343 INFO L93 Difference]: Finished difference Result 22 states and 26 transitions. [2021-11-20 22:48:33,344 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-11-20 22:48:33,344 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 1.4615384615384615) internal successors, (19), 12 states have internal predecessors, (19), 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 21 [2021-11-20 22:48:33,345 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 22:48:33,345 INFO L225 Difference]: With dead ends: 22 [2021-11-20 22:48:33,345 INFO L226 Difference]: Without dead ends: 0 [2021-11-20 22:48:33,345 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 68 GetRequests, 49 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 81 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=90, Invalid=330, Unknown=0, NotChecked=0, Total=420 [2021-11-20 22:48:33,346 INFO L933 BasicCegarLoop]: 1 mSDtfsCounter, 9 mSDsluCounter, 3 mSDsCounter, 0 mSdLazyCounter, 97 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 9 SdHoareTripleChecker+Valid, 4 SdHoareTripleChecker+Invalid, 109 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 97 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-20 22:48:33,346 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [9 Valid, 4 Invalid, 109 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 97 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-20 22:48:33,347 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 0 states. [2021-11-20 22:48:33,347 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 0 to 0. [2021-11-20 22:48:33,347 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 0 states, 0 states have (on average 0.0) internal successors, (0), 0 states have internal predecessors, (0), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 22:48:33,347 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 0 states to 0 states and 0 transitions. [2021-11-20 22:48:33,348 INFO L78 Accepts]: Start accepts. Automaton has 0 states and 0 transitions. Word has length 21 [2021-11-20 22:48:33,348 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 22:48:33,348 INFO L470 AbstractCegarLoop]: Abstraction has 0 states and 0 transitions. [2021-11-20 22:48:33,348 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 1.4615384615384615) internal successors, (19), 12 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 22:48:33,348 INFO L276 IsEmpty]: Start isEmpty. Operand 0 states and 0 transitions. [2021-11-20 22:48:33,348 INFO L282 IsEmpty]: Finished isEmpty. No accepting run. [2021-11-20 22:48:33,350 INFO L764 garLoopResultBuilder]: Registering result SAFE for location ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION (0 of 1 remaining) [2021-11-20 22:48:33,377 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7bc8bb1-d703-4dba-9aca-f4b274a5fe95/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-20 22:48:33,558 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7bc8bb1-d703-4dba-9aca-f4b274a5fe95/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2021-11-20 22:48:33,560 INFO L343 DoubleDeckerVisitor]: Before removal of dead ends 0 states and 0 transitions. [2021-11-20 22:48:33,969 INFO L858 garLoopResultBuilder]: For program point L19(lines 19 21) no Hoare annotation was computed. [2021-11-20 22:48:33,969 INFO L861 garLoopResultBuilder]: At program point L19-2(lines 18 23) the Hoare annotation is: true [2021-11-20 22:48:33,970 INFO L858 garLoopResultBuilder]: For program point ULTIMATE.startENTRY(line -1) no Hoare annotation was computed. [2021-11-20 22:48:33,970 INFO L858 garLoopResultBuilder]: For program point ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION(line 20) no Hoare annotation was computed. [2021-11-20 22:48:33,971 INFO L858 garLoopResultBuilder]: For program point L20(line 20) no Hoare annotation was computed. [2021-11-20 22:48:33,971 INFO L854 garLoopResultBuilder]: At program point L37-3(lines 37 38) the Hoare annotation is: (and (<= 0 |#NULL.base|) (<= 0 |ULTIMATE.start_main_~#string_A~0#1.offset|) (<= 0 |ULTIMATE.start_main_~#string_B~0#1.base|) (<= |#NULL.offset| 0) (<= |ULTIMATE.start_main_~#string_A~0#1.offset| 0) (<= |ULTIMATE.start_main_~found~0#1| 0) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= |#NULL.base| 0) (<= 0 |ULTIMATE.start_main_~#string_A~0#1.base|) (<= |ULTIMATE.start_main_~#string_B~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~#string_B~0#1.offset|) (<= 0 |ULTIMATE.start_main_~found~0#1|) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|)) [2021-11-20 22:48:33,971 INFO L858 garLoopResultBuilder]: For program point ULTIMATE.startEXIT(line -1) no Hoare annotation was computed. [2021-11-20 22:48:33,971 INFO L854 garLoopResultBuilder]: At program point L33-3(lines 33 34) the Hoare annotation is: (and (<= 0 |#NULL.base|) (<= 0 |ULTIMATE.start_main_~#string_A~0#1.offset|) (<= 0 |ULTIMATE.start_main_~#string_B~0#1.base|) (<= |#NULL.offset| 0) (<= |ULTIMATE.start_main_~#string_A~0#1.offset| 0) (<= |ULTIMATE.start_main_~found~0#1| 0) (<= 0 |ULTIMATE.start_main_~i~0#1|) (<= |#NULL.base| 0) (<= 0 |ULTIMATE.start_main_~#string_A~0#1.base|) (<= |ULTIMATE.start_main_~#string_B~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~#string_B~0#1.offset|) (<= 0 |ULTIMATE.start_main_~found~0#1|) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|)) [2021-11-20 22:48:33,971 INFO L858 garLoopResultBuilder]: For program point L46-1(lines 46 47) no Hoare annotation was computed. [2021-11-20 22:48:33,971 INFO L854 garLoopResultBuilder]: At program point L46-3(lines 46 47) the Hoare annotation is: (and (<= 0 |#NULL.base|) (<= 0 |ULTIMATE.start_main_~#string_A~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nc_B~0#1|) (<= 0 |ULTIMATE.start_main_~#string_B~0#1.base|) (<= 5 |ULTIMATE.start_main_~i~0#1|) (<= |#NULL.offset| 0) (<= |ULTIMATE.start_main_~#string_A~0#1.offset| 0) (<= |ULTIMATE.start_main_~found~0#1| 0) (<= |#NULL.base| 0) (<= 0 |ULTIMATE.start_main_~#string_A~0#1.base|) (<= |ULTIMATE.start_main_~#string_B~0#1.offset| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#string_A~0#1.base|) (+ |ULTIMATE.start_main_~nc_A~0#1| |ULTIMATE.start_main_~#string_A~0#1.offset|)) 0) (<= 0 |ULTIMATE.start_main_~nc_A~0#1|) (<= 0 |ULTIMATE.start_main_~#string_B~0#1.offset|) (<= 0 |ULTIMATE.start_main_~found~0#1|) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|)) [2021-11-20 22:48:33,971 INFO L858 garLoopResultBuilder]: For program point L46-4(lines 29 72) no Hoare annotation was computed. [2021-11-20 22:48:33,971 INFO L858 garLoopResultBuilder]: For program point L42-1(lines 42 43) no Hoare annotation was computed. [2021-11-20 22:48:33,971 INFO L854 garLoopResultBuilder]: At program point L42-3(lines 42 43) the Hoare annotation is: (and (<= 0 |#NULL.base|) (<= 0 |ULTIMATE.start_main_~#string_A~0#1.offset|) (<= 0 |ULTIMATE.start_main_~#string_B~0#1.base|) (<= 5 |ULTIMATE.start_main_~i~0#1|) (<= |#NULL.offset| 0) (<= |ULTIMATE.start_main_~#string_A~0#1.offset| 0) (<= |ULTIMATE.start_main_~found~0#1| 0) (<= |#NULL.base| 0) (<= 0 |ULTIMATE.start_main_~#string_A~0#1.base|) (<= |ULTIMATE.start_main_~#string_B~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nc_A~0#1|) (<= 0 |ULTIMATE.start_main_~#string_B~0#1.offset|) (<= 0 |ULTIMATE.start_main_~found~0#1|) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|)) [2021-11-20 22:48:33,971 INFO L861 garLoopResultBuilder]: At program point L71(lines 28 72) the Hoare annotation is: true [2021-11-20 22:48:33,972 INFO L858 garLoopResultBuilder]: For program point L42-4(lines 42 43) no Hoare annotation was computed. [2021-11-20 22:48:33,973 INFO L854 garLoopResultBuilder]: At program point L55-2(lines 53 65) the Hoare annotation is: (and (<= 0 |#NULL.base|) (<= 0 |ULTIMATE.start_main_~#string_A~0#1.offset|) (<= 0 |ULTIMATE.start_main_~nc_B~0#1|) (<= 0 |ULTIMATE.start_main_~#string_B~0#1.base|) (<= |#NULL.offset| 0) (<= |ULTIMATE.start_main_~#string_A~0#1.offset| 0) (<= |ULTIMATE.start_main_~found~0#1| 0) (<= |#NULL.base| 0) (<= 0 |ULTIMATE.start_main_~#string_A~0#1.base|) (<= |ULTIMATE.start_main_~#string_B~0#1.offset| 0) (<= 0 |ULTIMATE.start_main_~nc_A~0#1|) (<= 0 |ULTIMATE.start_main_~#string_B~0#1.offset|) (<= 0 |ULTIMATE.start_main_~found~0#1|) (<= 0 |#NULL.offset|) (<= 0 |#StackHeapBarrier|)) [2021-11-20 22:48:33,973 INFO L858 garLoopResultBuilder]: For program point L39(line 39) no Hoare annotation was computed. [2021-11-20 22:48:33,973 INFO L858 garLoopResultBuilder]: For program point L35(line 35) no Hoare annotation was computed. [2021-11-20 22:48:33,977 INFO L732 BasicCegarLoop]: Path program histogram: [1, 1, 1, 1, 1, 1] [2021-11-20 22:48:33,978 INFO L179 ceAbstractionStarter]: Computing trace abstraction results [2021-11-20 22:48:34,003 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction CFG 20.11 10:48:34 BoogieIcfgContainer [2021-11-20 22:48:34,003 INFO L132 PluginConnector]: ------------------------ END TraceAbstraction---------------------------- [2021-11-20 22:48:34,004 INFO L113 PluginConnector]: ------------------------Witness Printer---------------------------- [2021-11-20 22:48:34,004 INFO L271 PluginConnector]: Initializing Witness Printer... [2021-11-20 22:48:34,004 INFO L275 PluginConnector]: Witness Printer initialized [2021-11-20 22:48:34,005 INFO L185 PluginConnector]: Executing the observer RCFGCatcher from plugin Witness Printer for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.11 10:48:16" (3/4) ... [2021-11-20 22:48:34,007 INFO L137 WitnessPrinter]: Generating witness for correct program [2021-11-20 22:48:34,017 INFO L910 BoogieBacktranslator]: Reduced CFG by removing 23 nodes and edges [2021-11-20 22:48:34,017 INFO L910 BoogieBacktranslator]: Reduced CFG by removing 8 nodes and edges [2021-11-20 22:48:34,017 INFO L910 BoogieBacktranslator]: Reduced CFG by removing 3 nodes and edges [2021-11-20 22:48:34,018 INFO L910 BoogieBacktranslator]: Reduced CFG by removing 1 nodes and edges [2021-11-20 22:48:34,052 INFO L141 WitnessManager]: Wrote witness to /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7bc8bb1-d703-4dba-9aca-f4b274a5fe95/bin/utaipan-TEXQjIfE4P/witness.graphml [2021-11-20 22:48:34,052 INFO L132 PluginConnector]: ------------------------ END Witness Printer---------------------------- [2021-11-20 22:48:34,053 INFO L158 Benchmark]: Toolchain (without parser) took 18363.08ms. Allocated memory was 104.9MB in the beginning and 182.5MB in the end (delta: 77.6MB). Free memory was 72.3MB in the beginning and 153.1MB in the end (delta: -80.8MB). There was no memory consumed. Max. memory is 16.1GB. [2021-11-20 22:48:34,053 INFO L158 Benchmark]: CDTParser took 0.27ms. Allocated memory is still 104.9MB. Free memory was 57.5MB in the beginning and 57.4MB in the end (delta: 83.9kB). There was no memory consumed. Max. memory is 16.1GB. [2021-11-20 22:48:34,054 INFO L158 Benchmark]: CACSL2BoogieTranslator took 250.00ms. Allocated memory is still 104.9MB. Free memory was 72.0MB in the beginning and 78.2MB in the end (delta: -6.1MB). Peak memory consumption was 6.3MB. Max. memory is 16.1GB. [2021-11-20 22:48:34,054 INFO L158 Benchmark]: Boogie Procedure Inliner took 40.08ms. Allocated memory is still 104.9MB. Free memory was 78.2MB in the beginning and 76.4MB in the end (delta: 1.8MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. [2021-11-20 22:48:34,054 INFO L158 Benchmark]: Boogie Preprocessor took 27.46ms. Allocated memory is still 104.9MB. Free memory was 76.4MB in the beginning and 75.2MB in the end (delta: 1.2MB). There was no memory consumed. Max. memory is 16.1GB. [2021-11-20 22:48:34,055 INFO L158 Benchmark]: RCFGBuilder took 399.84ms. Allocated memory is still 104.9MB. Free memory was 75.2MB in the beginning and 62.6MB in the end (delta: 12.6MB). Peak memory consumption was 12.6MB. Max. memory is 16.1GB. [2021-11-20 22:48:34,055 INFO L158 Benchmark]: TraceAbstraction took 17591.24ms. Allocated memory was 104.9MB in the beginning and 182.5MB in the end (delta: 77.6MB). Free memory was 61.8MB in the beginning and 156.3MB in the end (delta: -94.4MB). Peak memory consumption was 92.8MB. Max. memory is 16.1GB. [2021-11-20 22:48:34,056 INFO L158 Benchmark]: Witness Printer took 48.64ms. Allocated memory is still 182.5MB. Free memory was 156.3MB in the beginning and 153.1MB in the end (delta: 3.1MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. [2021-11-20 22:48:34,058 INFO L339 ainManager$Toolchain]: ####################### End [Toolchain 1] ####################### --- Results --- * Results from de.uni_freiburg.informatik.ultimate.core: - StatisticsResult: Toolchain Benchmarks Benchmark results are: * CDTParser took 0.27ms. Allocated memory is still 104.9MB. Free memory was 57.5MB in the beginning and 57.4MB in the end (delta: 83.9kB). There was no memory consumed. Max. memory is 16.1GB. * CACSL2BoogieTranslator took 250.00ms. Allocated memory is still 104.9MB. Free memory was 72.0MB in the beginning and 78.2MB in the end (delta: -6.1MB). Peak memory consumption was 6.3MB. Max. memory is 16.1GB. * Boogie Procedure Inliner took 40.08ms. Allocated memory is still 104.9MB. Free memory was 78.2MB in the beginning and 76.4MB in the end (delta: 1.8MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. * Boogie Preprocessor took 27.46ms. Allocated memory is still 104.9MB. Free memory was 76.4MB in the beginning and 75.2MB in the end (delta: 1.2MB). There was no memory consumed. Max. memory is 16.1GB. * RCFGBuilder took 399.84ms. Allocated memory is still 104.9MB. Free memory was 75.2MB in the beginning and 62.6MB in the end (delta: 12.6MB). Peak memory consumption was 12.6MB. Max. memory is 16.1GB. * TraceAbstraction took 17591.24ms. Allocated memory was 104.9MB in the beginning and 182.5MB in the end (delta: 77.6MB). Free memory was 61.8MB in the beginning and 156.3MB in the end (delta: -94.4MB). Peak memory consumption was 92.8MB. Max. memory is 16.1GB. * Witness Printer took 48.64ms. Allocated memory is still 182.5MB. Free memory was 156.3MB in the beginning and 153.1MB in the end (delta: 3.1MB). Peak memory consumption was 2.1MB. Max. memory is 16.1GB. * Results from de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction: - StatisticsResult: ErrorAutomatonStatistics NumberErrorTraces: 0, NumberStatementsAllTraces: 0, NumberRelevantStatements: 0, 0.0s ErrorAutomatonConstructionTimeTotal, 0.0s FaulLocalizationTime, NumberStatementsFirstTrace: -1, TraceLengthAvg: 0, 0.0s ErrorAutomatonConstructionTimeAvg, 0.0s ErrorAutomatonDifferenceTimeAvg, 0.0s ErrorAutomatonDifferenceTimeTotal, NumberOfNoEnhancement: 0, NumberOfFiniteEnhancement: 0, NumberOfInfiniteEnhancement: 0 - PositiveResult [Line: 20]: call to reach_error is unreachable For all program executions holds that call to reach_error is unreachable at this location - StatisticsResult: Ultimate Automizer benchmark data CFG has 1 procedures, 18 locations, 1 error locations. Started 1 CEGAR loops. OverallTime: 17.5s, OverallIterations: 6, TraceHistogramMax: 2, PathProgramHistogramMax: 1, EmptinessCheckTime: 0.0s, AutomataDifference: 1.2s, DeadEndRemovalTime: 0.0s, HoareAnnotationTime: 0.4s, InitialAbstractionConstructionTime: 0.0s, PartialOrderReductionTime: 0.0s, HoareTripleCheckerStatistics: 0 mSolverCounterUnknown, 65 SdHoareTripleChecker+Valid, 0.6s IncrementalHoareTripleChecker+Time, 0 mSdLazyCounter, 65 mSDsluCounter, 124 SdHoareTripleChecker+Invalid, 0.5s Time, 0 mProtectedAction, 0 SdHoareTripleChecker+Unchecked, 0 IncrementalHoareTripleChecker+Unchecked, 95 mSDsCounter, 54 IncrementalHoareTripleChecker+Valid, 0 mProtectedPredicate, 653 IncrementalHoareTripleChecker+Invalid, 707 SdHoareTripleChecker+Unknown, 0 mSolverCounterNotChecked, 54 mSolverCounterUnsat, 30 mSDtfsCounter, 653 mSolverCounterSat, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Unknown, PredicateUnifierStatistics: 0 DeclaredPredicates, 296 GetRequests, 210 SyntacticMatches, 0 SemanticMatches, 86 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 354 ImplicationChecksByTransitivity, 2.5s Time, 0.0s BasicInterpolantAutomatonTime, BiggestAbstraction: size=22occurred in iteration=2, InterpolantAutomatonStates: 69, traceCheckStatistics: No data available, InterpolantConsolidationStatistics: No data available, PathInvariantsStatistics: No data available, 0/0 InterpolantCoveringCapability, TotalInterpolationStatistics: No data available, 0.0s DumpTime, AutomataMinimizationStatistics: 0.0s AutomataMinimizationTime, 6 MinimizatonAttempts, 11 StatesRemovedByMinimization, 5 NontrivialMinimizations, HoareAnnotationStatistics: 0.0s HoareAnnotationTime, 7 LocationsWithAnnotation, 7 PreInvPairs, 25 NumberOfFragments, 238 HoareAnnotationTreeSize, 7 FomulaSimplifications, 18 FormulaSimplificationTreeSizeReduction, 0.0s HoareSimplificationTime, 7 FomulaSimplificationsInter, 948 FormulaSimplificationTreeSizeReductionInter, 0.4s HoareSimplificationTimeInter, RefinementEngineStatistics: TRACE_CHECK: 0.1s SsaConstructionTime, 0.2s SatisfiabilityAnalysisTime, 0.7s InterpolantComputationTime, 198 NumberOfCodeBlocks, 198 NumberOfCodeBlocksAsserted, 11 NumberOfCheckSat, 275 ConstructedInterpolants, 0 QuantifiedInterpolants, 337 SizeOfPredicates, 0 NumberOfNonLiveVariables, 483 ConjunctsInSsa, 15 ConjunctsInUnsatCore, 16 InterpolantComputations, 1 PerfectInterpolantSequences, 54/69 InterpolantCoveringCapability, INVARIANT_SYNTHESIS: No data available, INTERPOLANT_CONSOLIDATION: No data available, ABSTRACT_INTERPRETATION: No data available, PDR: No data available, ACCELERATED_INTERPOLATION: No data available, SIFA: OVERALL_TIME: 11.5s, ICFG_INTERPRETER_ENTERED_PROCEDURES: 5, DAG_INTERPRETER_EARLY_EXIT_QUERIES_NONTRIVIAL: 70, DAG_INTERPRETER_EARLY_EXITS: 5, TOOLS_POST_APPLICATIONS: 136, TOOLS_POST_TIME: 10.9s, TOOLS_POST_CALL_APPLICATIONS: 0, TOOLS_POST_CALL_TIME: 0.0s, TOOLS_POST_RETURN_APPLICATIONS: 0, TOOLS_POST_RETURN_TIME: 0.0s, TOOLS_QUANTIFIERELIM_APPLICATIONS: 136, TOOLS_QUANTIFIERELIM_TIME: 10.9s, TOOLS_QUANTIFIERELIM_MAX_TIME: 0.5s, FLUID_QUERY_TIME: 0.0s, FLUID_QUERIES: 329, FLUID_YES_ANSWERS: 0, DOMAIN_JOIN_APPLICATIONS: 0, DOMAIN_JOIN_TIME: 0.0s, DOMAIN_ALPHA_APPLICATIONS: 0, DOMAIN_ALPHA_TIME: 0.0s, DOMAIN_WIDEN_APPLICATIONS: 36, DOMAIN_WIDEN_TIME: 0.3s, DOMAIN_ISSUBSETEQ_APPLICATIONS: 53, DOMAIN_ISSUBSETEQ_TIME: 0.1s, DOMAIN_ISBOTTOM_APPLICATIONS: 70, DOMAIN_ISBOTTOM_TIME: 0.0s, LOOP_SUMMARIZER_APPLICATIONS: 17, LOOP_SUMMARIZER_CACHE_MISSES: 17, LOOP_SUMMARIZER_OVERALL_TIME: 7.5s, LOOP_SUMMARIZER_NEW_COMPUTATION_TIME: 7.5s, LOOP_SUMMARIZER_FIXPOINT_ITERATIONS: 53, CALL_SUMMARIZER_APPLICATIONS: 0, CALL_SUMMARIZER_CACHE_MISSES: 0, CALL_SUMMARIZER_OVERALL_TIME: 0.0s, CALL_SUMMARIZER_NEW_COMPUTATION_TIME: 0.0s, PROCEDURE_GRAPH_BUILDER_TIME: 0.0s, PATH_EXPR_TIME: 0.0s, REGEX_TO_DAG_TIME: 0.0s, DAG_COMPRESSION_TIME: 0.0s, DAG_COMPRESSION_PROCESSED_NODES: 879, DAG_COMPRESSION_RETAINED_NODES: 222, ReuseStatistics: No data available - AllSpecificationsHoldResult: All specifications hold 1 specifications checked. All of them hold - InvariantResult [Line: 18]: Loop Invariant Derived loop invariant: 1 - InvariantResult [Line: 46]: Loop Invariant Derived loop invariant: (((((((((((((((0 <= #NULL && 0 <= string_A) && 0 <= nc_B) && 0 <= string_B) && 5 <= i) && #NULL <= 0) && string_A <= 0) && found <= 0) && #NULL <= 0) && 0 <= string_A) && string_B <= 0) && unknown-#memory_int-unknown[string_A][nc_A + string_A] == 0) && 0 <= nc_A) && 0 <= string_B) && 0 <= found) && 0 <= #NULL) && 0 <= unknown-#StackHeapBarrier-unknown - InvariantResult [Line: 53]: Loop Invariant Derived loop invariant: (((((((((((((0 <= #NULL && 0 <= string_A) && 0 <= nc_B) && 0 <= string_B) && #NULL <= 0) && string_A <= 0) && found <= 0) && #NULL <= 0) && 0 <= string_A) && string_B <= 0) && 0 <= nc_A) && 0 <= string_B) && 0 <= found) && 0 <= #NULL) && 0 <= unknown-#StackHeapBarrier-unknown - InvariantResult [Line: 28]: Loop Invariant Derived loop invariant: 1 - InvariantResult [Line: 37]: Loop Invariant Derived loop invariant: ((((((((((((0 <= #NULL && 0 <= string_A) && 0 <= string_B) && #NULL <= 0) && string_A <= 0) && found <= 0) && 0 <= i) && #NULL <= 0) && 0 <= string_A) && string_B <= 0) && 0 <= string_B) && 0 <= found) && 0 <= #NULL) && 0 <= unknown-#StackHeapBarrier-unknown - InvariantResult [Line: 33]: Loop Invariant Derived loop invariant: ((((((((((((0 <= #NULL && 0 <= string_A) && 0 <= string_B) && #NULL <= 0) && string_A <= 0) && found <= 0) && 0 <= i) && #NULL <= 0) && 0 <= string_A) && string_B <= 0) && 0 <= string_B) && 0 <= found) && 0 <= #NULL) && 0 <= unknown-#StackHeapBarrier-unknown - InvariantResult [Line: 42]: Loop Invariant Derived loop invariant: (((((((((((((0 <= #NULL && 0 <= string_A) && 0 <= string_B) && 5 <= i) && #NULL <= 0) && string_A <= 0) && found <= 0) && #NULL <= 0) && 0 <= string_A) && string_B <= 0) && 0 <= nc_A) && 0 <= string_B) && 0 <= found) && 0 <= #NULL) && 0 <= unknown-#StackHeapBarrier-unknown RESULT: Ultimate proved your program to be correct! [2021-11-20 22:48:34,114 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_f7bc8bb1-d703-4dba-9aca-f4b274a5fe95/bin/utaipan-TEXQjIfE4P/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Forceful destruction successful, exit code 0 Received shutdown request... --- End real Ultimate output --- Execution finished normally Writing output log to file Ultimate.log Result: TRUE