./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/array-multidimensional/copy-2-u.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 839c364b Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_370ea4c9-fcf2-4465-b16d-c3b3fc1748b2/bin/utaipan-eEHZpOm5b7/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_370ea4c9-fcf2-4465-b16d-c3b3fc1748b2/bin/utaipan-eEHZpOm5b7/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_370ea4c9-fcf2-4465-b16d-c3b3fc1748b2/bin/utaipan-eEHZpOm5b7/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_370ea4c9-fcf2-4465-b16d-c3b3fc1748b2/bin/utaipan-eEHZpOm5b7/config/TaipanReach.xml -i ../../sv-benchmarks/c/array-multidimensional/copy-2-u.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_370ea4c9-fcf2-4465-b16d-c3b3fc1748b2/bin/utaipan-eEHZpOm5b7/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_370ea4c9-fcf2-4465-b16d-c3b3fc1748b2/bin/utaipan-eEHZpOm5b7 --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 d9e382438d8fbe8dfce0f613a239dc56836f436a035cb511dde070c4306eb1f9 --- Real Ultimate output --- This is Ultimate 0.2.2-hotfix-svcomp22-839c364 [2021-11-25 20:17:10,972 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-25 20:17:10,974 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-25 20:17:11,025 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-25 20:17:11,026 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-25 20:17:11,028 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-25 20:17:11,029 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-25 20:17:11,031 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-25 20:17:11,033 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-25 20:17:11,034 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-25 20:17:11,035 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-25 20:17:11,037 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-25 20:17:11,037 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-25 20:17:11,038 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-25 20:17:11,040 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-25 20:17:11,041 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-25 20:17:11,042 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-25 20:17:11,043 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-25 20:17:11,045 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-25 20:17:11,048 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-25 20:17:11,050 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-25 20:17:11,051 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-25 20:17:11,052 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-25 20:17:11,053 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-25 20:17:11,057 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-25 20:17:11,057 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-25 20:17:11,058 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-25 20:17:11,059 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-25 20:17:11,059 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-25 20:17:11,060 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-25 20:17:11,061 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-25 20:17:11,062 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-25 20:17:11,063 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-25 20:17:11,063 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-25 20:17:11,065 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-25 20:17:11,065 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-25 20:17:11,066 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-25 20:17:11,066 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-25 20:17:11,067 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-25 20:17:11,068 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-25 20:17:11,069 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-25 20:17:11,070 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_370ea4c9-fcf2-4465-b16d-c3b3fc1748b2/bin/utaipan-eEHZpOm5b7/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-25 20:17:11,094 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-25 20:17:11,094 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-25 20:17:11,095 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-25 20:17:11,095 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-25 20:17:11,096 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-25 20:17:11,096 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-25 20:17:11,096 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-25 20:17:11,096 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-25 20:17:11,096 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-25 20:17:11,097 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-25 20:17:11,097 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-25 20:17:11,097 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-25 20:17:11,097 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-25 20:17:11,098 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-25 20:17:11,098 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-25 20:17:11,098 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-25 20:17:11,098 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-25 20:17:11,099 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-25 20:17:11,099 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-25 20:17:11,100 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-25 20:17:11,100 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-25 20:17:11,100 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-25 20:17:11,100 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-25 20:17:11,100 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-25 20:17:11,101 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-25 20:17:11,101 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-25 20:17:11,101 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-25 20:17:11,101 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-25 20:17:11,101 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-25 20:17:11,102 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-25 20:17:11,102 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-25 20:17:11,102 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-25 20:17:11,102 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-25 20:17:11,103 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-25 20:17:11,103 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-25 20:17:11,103 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-25 20:17:11,103 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-25 20:17:11,104 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-25 20:17:11,104 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-25 20:17:11,104 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-25 20:17:11,104 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-25 20:17:11,104 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_370ea4c9-fcf2-4465-b16d-c3b3fc1748b2/bin/utaipan-eEHZpOm5b7/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_370ea4c9-fcf2-4465-b16d-c3b3fc1748b2/bin/utaipan-eEHZpOm5b7 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> d9e382438d8fbe8dfce0f613a239dc56836f436a035cb511dde070c4306eb1f9 [2021-11-25 20:17:11,353 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-25 20:17:11,373 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-25 20:17:11,376 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-25 20:17:11,377 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-25 20:17:11,378 INFO L275 PluginConnector]: CDTParser initialized [2021-11-25 20:17:11,379 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_370ea4c9-fcf2-4465-b16d-c3b3fc1748b2/bin/utaipan-eEHZpOm5b7/../../sv-benchmarks/c/array-multidimensional/copy-2-u.c [2021-11-25 20:17:11,456 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_370ea4c9-fcf2-4465-b16d-c3b3fc1748b2/bin/utaipan-eEHZpOm5b7/data/e91d8acaf/d4efd9752bc645f482de05722eca1017/FLAG8cfabd364 [2021-11-25 20:17:11,823 INFO L306 CDTParser]: Found 1 translation units. [2021-11-25 20:17:11,824 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_370ea4c9-fcf2-4465-b16d-c3b3fc1748b2/sv-benchmarks/c/array-multidimensional/copy-2-u.c [2021-11-25 20:17:11,835 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_370ea4c9-fcf2-4465-b16d-c3b3fc1748b2/bin/utaipan-eEHZpOm5b7/data/e91d8acaf/d4efd9752bc645f482de05722eca1017/FLAG8cfabd364 [2021-11-25 20:17:12,247 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_370ea4c9-fcf2-4465-b16d-c3b3fc1748b2/bin/utaipan-eEHZpOm5b7/data/e91d8acaf/d4efd9752bc645f482de05722eca1017 [2021-11-25 20:17:12,251 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-25 20:17:12,255 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-25 20:17:12,260 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-25 20:17:12,260 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-25 20:17:12,264 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-25 20:17:12,264 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 08:17:12" (1/1) ... [2021-11-25 20:17:12,265 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@48fc8181 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:17:12, skipping insertion in model container [2021-11-25 20:17:12,265 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 08:17:12" (1/1) ... [2021-11-25 20:17:12,272 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-25 20:17:12,286 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-25 20:17:12,447 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_370ea4c9-fcf2-4465-b16d-c3b3fc1748b2/sv-benchmarks/c/array-multidimensional/copy-2-u.c[320,333] [2021-11-25 20:17:12,465 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-25 20:17:12,473 INFO L203 MainTranslator]: Completed pre-run [2021-11-25 20:17:12,485 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_370ea4c9-fcf2-4465-b16d-c3b3fc1748b2/sv-benchmarks/c/array-multidimensional/copy-2-u.c[320,333] [2021-11-25 20:17:12,494 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-25 20:17:12,507 INFO L208 MainTranslator]: Completed translation [2021-11-25 20:17:12,508 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:17:12 WrapperNode [2021-11-25 20:17:12,508 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-25 20:17:12,509 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-25 20:17:12,509 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-25 20:17:12,509 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-25 20:17:12,516 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:17:12" (1/1) ... [2021-11-25 20:17:12,522 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:17:12" (1/1) ... [2021-11-25 20:17:12,543 INFO L137 Inliner]: procedures = 14, calls = 19, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 81 [2021-11-25 20:17:12,543 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-25 20:17:12,544 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-25 20:17:12,544 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-25 20:17:12,544 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-25 20:17:12,553 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:17:12" (1/1) ... [2021-11-25 20:17:12,553 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:17:12" (1/1) ... [2021-11-25 20:17:12,555 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:17:12" (1/1) ... [2021-11-25 20:17:12,555 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:17:12" (1/1) ... [2021-11-25 20:17:12,561 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:17:12" (1/1) ... [2021-11-25 20:17:12,566 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:17:12" (1/1) ... [2021-11-25 20:17:12,568 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:17:12" (1/1) ... [2021-11-25 20:17:12,570 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-25 20:17:12,571 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-25 20:17:12,571 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-25 20:17:12,571 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-25 20:17:12,575 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:17:12" (1/1) ... [2021-11-25 20:17:12,592 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-25 20:17:12,605 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_370ea4c9-fcf2-4465-b16d-c3b3fc1748b2/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:17:12,619 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_370ea4c9-fcf2-4465-b16d-c3b3fc1748b2/bin/utaipan-eEHZpOm5b7/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-25 20:17:12,622 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_370ea4c9-fcf2-4465-b16d-c3b3fc1748b2/bin/utaipan-eEHZpOm5b7/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-25 20:17:12,659 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-25 20:17:12,660 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-25 20:17:12,660 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-11-25 20:17:12,660 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-11-25 20:17:12,660 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-25 20:17:12,660 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-25 20:17:12,660 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-11-25 20:17:12,660 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-11-25 20:17:12,715 INFO L236 CfgBuilder]: Building ICFG [2021-11-25 20:17:12,717 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-25 20:17:12,877 INFO L277 CfgBuilder]: Performing block encoding [2021-11-25 20:17:12,908 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-25 20:17:12,908 INFO L301 CfgBuilder]: Removed 6 assume(true) statements. [2021-11-25 20:17:12,911 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 08:17:12 BoogieIcfgContainer [2021-11-25 20:17:12,911 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-25 20:17:12,913 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-25 20:17:12,913 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-25 20:17:12,916 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-25 20:17:12,917 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 25.11 08:17:12" (1/3) ... [2021-11-25 20:17:12,917 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7e735abe and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 08:17:12, skipping insertion in model container [2021-11-25 20:17:12,918 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 08:17:12" (2/3) ... [2021-11-25 20:17:12,918 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7e735abe and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 08:17:12, skipping insertion in model container [2021-11-25 20:17:12,918 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 08:17:12" (3/3) ... [2021-11-25 20:17:12,920 INFO L111 eAbstractionObserver]: Analyzing ICFG copy-2-u.c [2021-11-25 20:17:12,925 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-25 20:17:12,925 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-25 20:17:12,992 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-25 20:17:13,014 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 [2021-11-25 20:17:13,015 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-25 20:17:13,028 INFO L276 IsEmpty]: Start isEmpty. Operand has 12 states, 10 states have (on average 1.8) internal successors, (18), 11 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) [2021-11-25 20:17:13,032 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2021-11-25 20:17:13,033 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:17:13,033 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:17:13,034 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:17:13,039 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:17:13,039 INFO L85 PathProgramCache]: Analyzing trace with hash -1209143189, now seen corresponding path program 1 times [2021-11-25 20:17:13,069 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:17:13,070 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [940144385] [2021-11-25 20:17:13,070 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:17:13,071 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:17:13,187 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-25 20:17:13,189 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1386363190] [2021-11-25 20:17:13,189 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:17:13,189 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:17:13,190 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_370ea4c9-fcf2-4465-b16d-c3b3fc1748b2/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:17:13,195 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_370ea4c9-fcf2-4465-b16d-c3b3fc1748b2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:17:13,202 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_370ea4c9-fcf2-4465-b16d-c3b3fc1748b2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-25 20:17:13,280 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:17:13,285 INFO L263 TraceCheckSpWp]: Trace formula consists of 80 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-25 20:17:13,289 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:17:13,384 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:17:13,384 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 20:17:13,385 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:17:13,385 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [940144385] [2021-11-25 20:17:13,386 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-25 20:17:13,388 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1386363190] [2021-11-25 20:17:13,389 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1386363190] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 20:17:13,390 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 20:17:13,390 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-25 20:17:13,393 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1862750869] [2021-11-25 20:17:13,393 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 20:17:13,398 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-25 20:17:13,398 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:17:13,424 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-25 20:17:13,424 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 20:17:13,427 INFO L87 Difference]: Start difference. First operand has 12 states, 10 states have (on average 1.8) internal successors, (18), 11 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) Second operand has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 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) [2021-11-25 20:17:13,470 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:17:13,470 INFO L93 Difference]: Finished difference Result 23 states and 35 transitions. [2021-11-25 20:17:13,471 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-25 20:17:13,473 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 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 7 [2021-11-25 20:17:13,473 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:17:13,480 INFO L225 Difference]: With dead ends: 23 [2021-11-25 20:17:13,480 INFO L226 Difference]: Without dead ends: 13 [2021-11-25 20:17:13,483 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-25 20:17:13,487 INFO L933 BasicCegarLoop]: 8 mSDtfsCounter, 2 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 21 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 12 SdHoareTripleChecker+Invalid, 21 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 21 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-25 20:17:13,488 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 12 Invalid, 21 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 21 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-25 20:17:13,505 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2021-11-25 20:17:13,515 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 12. [2021-11-25 20:17:13,516 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 12 states, 11 states have (on average 1.5454545454545454) internal successors, (17), 11 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) [2021-11-25 20:17:13,517 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 17 transitions. [2021-11-25 20:17:13,518 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 17 transitions. Word has length 7 [2021-11-25 20:17:13,518 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:17:13,519 INFO L470 AbstractCegarLoop]: Abstraction has 12 states and 17 transitions. [2021-11-25 20:17:13,519 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 2 states have internal predecessors, (7), 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) [2021-11-25 20:17:13,519 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 17 transitions. [2021-11-25 20:17:13,520 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2021-11-25 20:17:13,520 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:17:13,520 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:17:13,545 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_370ea4c9-fcf2-4465-b16d-c3b3fc1748b2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Ended with exit code 0 [2021-11-25 20:17:13,732 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_370ea4c9-fcf2-4465-b16d-c3b3fc1748b2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable0 [2021-11-25 20:17:13,733 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:17:13,733 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:17:13,734 INFO L85 PathProgramCache]: Analyzing trace with hash 993204907, now seen corresponding path program 1 times [2021-11-25 20:17:13,734 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:17:13,734 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [948521943] [2021-11-25 20:17:13,734 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:17:13,734 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:17:13,751 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-25 20:17:13,751 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [436292443] [2021-11-25 20:17:13,752 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:17:13,752 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:17:13,752 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_370ea4c9-fcf2-4465-b16d-c3b3fc1748b2/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:17:13,756 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_370ea4c9-fcf2-4465-b16d-c3b3fc1748b2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:17:13,770 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_370ea4c9-fcf2-4465-b16d-c3b3fc1748b2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-25 20:17:13,827 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:17:13,832 INFO L263 TraceCheckSpWp]: Trace formula consists of 86 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-25 20:17:13,833 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:17:13,870 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:17:13,871 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-25 20:17:13,881 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:17:13,881 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [948521943] [2021-11-25 20:17:13,881 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-25 20:17:13,881 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [436292443] [2021-11-25 20:17:13,882 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [436292443] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 20:17:13,882 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-25 20:17:13,882 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-25 20:17:13,883 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1223348583] [2021-11-25 20:17:13,883 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 20:17:13,884 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-25 20:17:13,884 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:17:13,884 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-25 20:17:13,885 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-25 20:17:13,885 INFO L87 Difference]: Start difference. First operand 12 states and 17 transitions. Second operand has 4 states, 4 states have (on average 2.25) internal successors, (9), 3 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:17:13,928 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:17:13,929 INFO L93 Difference]: Finished difference Result 31 states and 45 transitions. [2021-11-25 20:17:13,929 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-25 20:17:13,929 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.25) internal successors, (9), 3 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 9 [2021-11-25 20:17:13,930 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:17:13,930 INFO L225 Difference]: With dead ends: 31 [2021-11-25 20:17:13,930 INFO L226 Difference]: Without dead ends: 21 [2021-11-25 20:17:13,931 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-25 20:17:13,933 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 15 mSDsluCounter, 3 mSDsCounter, 0 mSdLazyCounter, 20 mSolverCounterSat, 14 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 15 SdHoareTripleChecker+Valid, 6 SdHoareTripleChecker+Invalid, 34 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 14 IncrementalHoareTripleChecker+Valid, 20 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-25 20:17:13,933 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [15 Valid, 6 Invalid, 34 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [14 Valid, 20 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-25 20:17:13,934 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2021-11-25 20:17:13,938 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 15. [2021-11-25 20:17:13,938 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 15 states, 14 states have (on average 1.4285714285714286) internal successors, (20), 14 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:17:13,939 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 20 transitions. [2021-11-25 20:17:13,939 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 20 transitions. Word has length 9 [2021-11-25 20:17:13,940 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:17:13,940 INFO L470 AbstractCegarLoop]: Abstraction has 15 states and 20 transitions. [2021-11-25 20:17:13,940 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 2.25) internal successors, (9), 3 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:17:13,940 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 20 transitions. [2021-11-25 20:17:13,941 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2021-11-25 20:17:13,941 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:17:13,941 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:17:13,966 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_370ea4c9-fcf2-4465-b16d-c3b3fc1748b2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-25 20:17:14,158 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_370ea4c9-fcf2-4465-b16d-c3b3fc1748b2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1 [2021-11-25 20:17:14,159 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:17:14,159 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:17:14,159 INFO L85 PathProgramCache]: Analyzing trace with hash -2088403375, now seen corresponding path program 1 times [2021-11-25 20:17:14,160 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:17:14,160 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1634076493] [2021-11-25 20:17:14,160 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:17:14,160 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:17:14,175 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-25 20:17:14,177 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [769262246] [2021-11-25 20:17:14,177 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:17:14,177 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:17:14,177 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_370ea4c9-fcf2-4465-b16d-c3b3fc1748b2/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:17:14,188 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_370ea4c9-fcf2-4465-b16d-c3b3fc1748b2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:17:14,189 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_370ea4c9-fcf2-4465-b16d-c3b3fc1748b2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-25 20:17:14,242 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:17:14,243 INFO L263 TraceCheckSpWp]: Trace formula consists of 95 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-25 20:17:14,244 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:17:14,317 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:17:14,319 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:17:14,390 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-25 20:17:14,391 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:17:14,391 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1634076493] [2021-11-25 20:17:14,391 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-25 20:17:14,392 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [769262246] [2021-11-25 20:17:14,392 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [769262246] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:17:14,392 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1796456389] [2021-11-25 20:17:14,410 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2021-11-25 20:17:14,411 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:17:14,415 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:17:14,421 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:17:14,421 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:17:14,503 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:17:14,504 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:17:14,583 INFO L354 Elim1Store]: treesize reduction 80, result has 29.8 percent of original size [2021-11-25 20:17:14,584 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 33 treesize of output 57 [2021-11-25 20:17:14,639 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:17:14,643 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:17:14,714 INFO L354 Elim1Store]: treesize reduction 98, result has 24.6 percent of original size [2021-11-25 20:17:14,715 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 6 select indices, 6 select index equivalence classes, 10 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 9 case distinctions, treesize of input 44 treesize of output 69 [2021-11-25 20:17:14,901 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:17:14,903 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 6 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 36 treesize of output 38 [2021-11-25 20:17:15,397 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:17:15,400 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:17:15,404 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:17:15,435 INFO L354 Elim1Store]: treesize reduction 67, result has 9.5 percent of original size [2021-11-25 20:17:15,438 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 339 treesize of output 322 [2021-11-25 20:17:15,606 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 21 treesize of output 17 [2021-11-25 20:17:15,661 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 21 treesize of output 17 [2021-11-25 20:17:15,882 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:17:16,196 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSifa [1796456389] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-25 20:17:16,197 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-25 20:17:16,197 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [4, 4] total 10 [2021-11-25 20:17:16,198 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1680851681] [2021-11-25 20:17:16,198 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-25 20:17:16,198 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-25 20:17:16,198 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:17:16,199 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-25 20:17:16,199 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=68, Unknown=0, NotChecked=0, Total=110 [2021-11-25 20:17:16,199 INFO L87 Difference]: Start difference. First operand 15 states and 20 transitions. Second operand has 5 states, 5 states have (on average 2.0) internal successors, (10), 4 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:17:16,493 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:17:16,493 INFO L93 Difference]: Finished difference Result 31 states and 38 transitions. [2021-11-25 20:17:16,494 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-25 20:17:16,494 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.0) internal successors, (10), 4 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 10 [2021-11-25 20:17:16,494 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:17:16,495 INFO L225 Difference]: With dead ends: 31 [2021-11-25 20:17:16,495 INFO L226 Difference]: Without dead ends: 24 [2021-11-25 20:17:16,496 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 29 GetRequests, 19 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 31 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=53, Invalid=79, Unknown=0, NotChecked=0, Total=132 [2021-11-25 20:17:16,497 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 12 mSDsluCounter, 6 mSDsCounter, 0 mSdLazyCounter, 36 mSolverCounterSat, 22 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 9 SdHoareTripleChecker+Invalid, 58 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 22 IncrementalHoareTripleChecker+Valid, 36 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 20:17:16,498 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [12 Valid, 9 Invalid, 58 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [22 Valid, 36 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 20:17:16,499 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2021-11-25 20:17:16,505 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 16. [2021-11-25 20:17:16,506 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 16 states, 15 states have (on average 1.4) internal successors, (21), 15 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) [2021-11-25 20:17:16,506 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 21 transitions. [2021-11-25 20:17:16,506 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 21 transitions. Word has length 10 [2021-11-25 20:17:16,507 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:17:16,507 INFO L470 AbstractCegarLoop]: Abstraction has 16 states and 21 transitions. [2021-11-25 20:17:16,507 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 2.0) internal successors, (10), 4 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-25 20:17:16,507 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 21 transitions. [2021-11-25 20:17:16,508 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2021-11-25 20:17:16,508 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:17:16,508 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:17:16,545 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_370ea4c9-fcf2-4465-b16d-c3b3fc1748b2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-25 20:17:16,716 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_370ea4c9-fcf2-4465-b16d-c3b3fc1748b2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable2 [2021-11-25 20:17:16,716 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:17:16,717 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:17:16,717 INFO L85 PathProgramCache]: Analyzing trace with hash 280877451, now seen corresponding path program 1 times [2021-11-25 20:17:16,717 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:17:16,717 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1236356586] [2021-11-25 20:17:16,718 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:17:16,718 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:17:16,724 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-25 20:17:16,725 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1255385115] [2021-11-25 20:17:16,725 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:17:16,725 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:17:16,725 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_370ea4c9-fcf2-4465-b16d-c3b3fc1748b2/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:17:16,726 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_370ea4c9-fcf2-4465-b16d-c3b3fc1748b2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:17:16,728 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_370ea4c9-fcf2-4465-b16d-c3b3fc1748b2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-25 20:17:16,774 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:17:16,775 INFO L263 TraceCheckSpWp]: Trace formula consists of 108 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-25 20:17:16,776 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:17:16,821 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-25 20:17:16,822 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:17:16,861 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-25 20:17:16,862 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:17:16,862 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1236356586] [2021-11-25 20:17:16,862 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-25 20:17:16,862 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1255385115] [2021-11-25 20:17:16,863 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1255385115] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:17:16,864 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [234911411] [2021-11-25 20:17:16,871 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-25 20:17:16,871 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:17:16,871 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:17:16,871 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:17:16,871 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:17:16,903 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:17:16,905 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:17:16,960 INFO L354 Elim1Store]: treesize reduction 98, result has 24.6 percent of original size [2021-11-25 20:17:16,960 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 6 select indices, 6 select index equivalence classes, 10 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 9 case distinctions, treesize of input 44 treesize of output 69 [2021-11-25 20:17:16,978 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:17:16,979 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:17:16,980 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 12 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 33 treesize of output 43 [2021-11-25 20:17:17,047 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:17:17,049 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 6 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 32 treesize of output 34 [2021-11-25 20:17:17,279 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:17:17,280 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:17:17,317 INFO L354 Elim1Store]: treesize reduction 100, result has 21.3 percent of original size [2021-11-25 20:17:17,317 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 331 treesize of output 324 [2021-11-25 20:17:17,544 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 21 treesize of output 17 [2021-11-25 20:17:17,582 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 21 treesize of output 17 [2021-11-25 20:17:17,786 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:17:17,796 INFO L354 Elim1Store]: treesize reduction 23, result has 36.1 percent of original size [2021-11-25 20:17:17,796 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 27 treesize of output 27 [2021-11-25 20:17:17,882 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:17:17,884 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:17:17,962 INFO L354 Elim1Store]: treesize reduction 188, result has 23.6 percent of original size [2021-11-25 20:17:17,962 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 6 case distinctions, treesize of input 110 treesize of output 129 [2021-11-25 20:17:18,079 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:17:18,091 INFO L354 Elim1Store]: treesize reduction 27, result has 38.6 percent of original size [2021-11-25 20:17:18,091 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 35 treesize of output 35 [2021-11-25 20:17:18,152 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:17:18,163 INFO L354 Elim1Store]: treesize reduction 27, result has 38.6 percent of original size [2021-11-25 20:17:18,163 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 35 treesize of output 35 [2021-11-25 20:17:18,214 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:17:18,692 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '426#(and (= |ULTIMATE.start_main_~i~0#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#A~0#1.base|) (+ |ULTIMATE.start_main_~#A~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| (* |ULTIMATE.start_main_~n~0#1| 4)) (* |ULTIMATE.start_main_~j~0#1| 4))) |ULTIMATE.start_main_#t~mem6#1|) (<= 0 |ULTIMATE.start_main_~#A~0#1.base|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_#t~mem7#1| |ULTIMATE.start_main_#t~mem6#1|) 1 0)) (= |ULTIMATE.start_main_~#A~0#1.offset| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#B~0#1.base|) (+ |ULTIMATE.start_main_~#B~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| (* |ULTIMATE.start_main_~n~0#1| 4)) (* |ULTIMATE.start_main_~j~0#1| 4))) |ULTIMATE.start_main_#t~mem7#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~#B~0#1.base|) (= |ULTIMATE.start_main_~j~0#1| 0) (= |ULTIMATE.start_main_~#B~0#1.offset| 0) (<= 0 |#StackHeapBarrier|) (= |ULTIMATE.start_main_~n~0#1| 1000) (= |#NULL.base| 0))' at error location [2021-11-25 20:17:18,692 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:17:18,693 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-25 20:17:18,693 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4] total 7 [2021-11-25 20:17:18,693 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1591198929] [2021-11-25 20:17:18,693 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-25 20:17:18,693 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-25 20:17:18,694 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:17:18,694 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-25 20:17:18,694 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=63, Invalid=93, Unknown=0, NotChecked=0, Total=156 [2021-11-25 20:17:18,694 INFO L87 Difference]: Start difference. First operand 16 states and 21 transitions. Second operand has 8 states, 8 states have (on average 2.125) internal successors, (17), 7 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) [2021-11-25 20:17:18,795 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:17:18,795 INFO L93 Difference]: Finished difference Result 52 states and 71 transitions. [2021-11-25 20:17:18,795 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-25 20:17:18,795 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 2.125) internal successors, (17), 7 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 13 [2021-11-25 20:17:18,796 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:17:18,796 INFO L225 Difference]: With dead ends: 52 [2021-11-25 20:17:18,796 INFO L226 Difference]: Without dead ends: 38 [2021-11-25 20:17:18,797 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 23 SyntacticMatches, 3 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 85 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=85, Invalid=125, Unknown=0, NotChecked=0, Total=210 [2021-11-25 20:17:18,798 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 60 mSDsluCounter, 9 mSDsCounter, 0 mSdLazyCounter, 31 mSolverCounterSat, 64 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 60 SdHoareTripleChecker+Valid, 12 SdHoareTripleChecker+Invalid, 95 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 64 IncrementalHoareTripleChecker+Valid, 31 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 20:17:18,798 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [60 Valid, 12 Invalid, 95 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [64 Valid, 31 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 20:17:18,799 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38 states. [2021-11-25 20:17:18,807 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38 to 31. [2021-11-25 20:17:18,807 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 31 states, 30 states have (on average 1.3) internal successors, (39), 30 states have internal predecessors, (39), 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) [2021-11-25 20:17:18,808 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 39 transitions. [2021-11-25 20:17:18,808 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 39 transitions. Word has length 13 [2021-11-25 20:17:18,809 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:17:18,809 INFO L470 AbstractCegarLoop]: Abstraction has 31 states and 39 transitions. [2021-11-25 20:17:18,809 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 2.125) internal successors, (17), 7 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) [2021-11-25 20:17:18,809 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 39 transitions. [2021-11-25 20:17:18,810 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2021-11-25 20:17:18,810 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:17:18,810 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:17:18,847 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_370ea4c9-fcf2-4465-b16d-c3b3fc1748b2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-25 20:17:19,022 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_370ea4c9-fcf2-4465-b16d-c3b3fc1748b2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:17:19,022 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:17:19,023 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:17:19,023 INFO L85 PathProgramCache]: Analyzing trace with hash -406304509, now seen corresponding path program 2 times [2021-11-25 20:17:19,023 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:17:19,023 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [156009711] [2021-11-25 20:17:19,023 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:17:19,023 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:17:19,032 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-25 20:17:19,032 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1725412838] [2021-11-25 20:17:19,032 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 20:17:19,032 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:17:19,033 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_370ea4c9-fcf2-4465-b16d-c3b3fc1748b2/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:17:19,033 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_370ea4c9-fcf2-4465-b16d-c3b3fc1748b2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:17:19,065 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_370ea4c9-fcf2-4465-b16d-c3b3fc1748b2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-25 20:17:19,099 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-11-25 20:17:19,099 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:17:19,100 INFO L263 TraceCheckSpWp]: Trace formula consists of 92 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-25 20:17:19,101 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:17:19,173 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-11-25 20:17:19,173 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:17:19,223 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-11-25 20:17:19,223 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:17:19,223 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [156009711] [2021-11-25 20:17:19,223 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-25 20:17:19,224 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1725412838] [2021-11-25 20:17:19,224 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1725412838] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:17:19,224 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1582870501] [2021-11-25 20:17:19,226 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-25 20:17:19,227 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:17:19,227 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:17:19,227 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:17:19,227 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:17:19,253 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:17:19,254 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:17:19,301 INFO L354 Elim1Store]: treesize reduction 80, result has 29.8 percent of original size [2021-11-25 20:17:19,302 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 33 treesize of output 57 [2021-11-25 20:17:19,319 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:17:19,322 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:17:19,377 INFO L354 Elim1Store]: treesize reduction 98, result has 24.6 percent of original size [2021-11-25 20:17:19,377 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 6 select indices, 6 select index equivalence classes, 10 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 9 case distinctions, treesize of input 44 treesize of output 69 [2021-11-25 20:17:19,452 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:17:19,453 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 6 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 36 treesize of output 38 [2021-11-25 20:17:19,677 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:17:19,680 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:17:19,682 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:17:19,702 INFO L354 Elim1Store]: treesize reduction 67, result has 9.5 percent of original size [2021-11-25 20:17:19,703 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 339 treesize of output 322 [2021-11-25 20:17:19,802 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 21 treesize of output 17 [2021-11-25 20:17:19,853 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 21 treesize of output 17 [2021-11-25 20:17:20,007 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:17:20,016 INFO L354 Elim1Store]: treesize reduction 23, result has 36.1 percent of original size [2021-11-25 20:17:20,017 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 27 treesize of output 27 [2021-11-25 20:17:20,083 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:17:20,084 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:17:20,142 INFO L354 Elim1Store]: treesize reduction 178, result has 27.6 percent of original size [2021-11-25 20:17:20,143 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 6 case distinctions, treesize of input 110 treesize of output 139 [2021-11-25 20:17:20,232 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:17:20,261 INFO L354 Elim1Store]: treesize reduction 27, result has 38.6 percent of original size [2021-11-25 20:17:20,262 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 35 treesize of output 35 [2021-11-25 20:17:20,331 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:17:20,341 INFO L354 Elim1Store]: treesize reduction 27, result has 38.6 percent of original size [2021-11-25 20:17:20,342 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 35 treesize of output 35 [2021-11-25 20:17:20,389 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:17:20,856 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '692#(and (= |ULTIMATE.start_main_~i~0#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#A~0#1.base|) (+ |ULTIMATE.start_main_~#A~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| (* |ULTIMATE.start_main_~n~0#1| 4)) (* |ULTIMATE.start_main_~j~0#1| 4))) |ULTIMATE.start_main_#t~mem6#1|) (<= 0 |ULTIMATE.start_main_~#A~0#1.base|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_#t~mem7#1| |ULTIMATE.start_main_#t~mem6#1|) 1 0)) (= |ULTIMATE.start_main_~#A~0#1.offset| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#B~0#1.base|) (+ |ULTIMATE.start_main_~#B~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| (* |ULTIMATE.start_main_~n~0#1| 4)) (* |ULTIMATE.start_main_~j~0#1| 4))) |ULTIMATE.start_main_#t~mem7#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~#B~0#1.base|) (= |ULTIMATE.start_main_~j~0#1| 0) (= |ULTIMATE.start_main_~#B~0#1.offset| 0) (<= 0 |#StackHeapBarrier|) (= |ULTIMATE.start_main_~n~0#1| 1000) (= |#NULL.base| 0))' at error location [2021-11-25 20:17:20,856 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:17:20,856 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-25 20:17:20,856 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3] total 5 [2021-11-25 20:17:20,856 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [912782700] [2021-11-25 20:17:20,856 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-25 20:17:20,857 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-25 20:17:20,857 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:17:20,857 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-25 20:17:20,857 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=66, Unknown=0, NotChecked=0, Total=110 [2021-11-25 20:17:20,858 INFO L87 Difference]: Start difference. First operand 31 states and 39 transitions. Second operand has 6 states, 6 states have (on average 3.0) internal successors, (18), 5 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) [2021-11-25 20:17:20,921 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:17:20,921 INFO L93 Difference]: Finished difference Result 72 states and 92 transitions. [2021-11-25 20:17:20,921 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-25 20:17:20,922 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 3.0) internal successors, (18), 5 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 19 [2021-11-25 20:17:20,922 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:17:20,924 INFO L225 Difference]: With dead ends: 72 [2021-11-25 20:17:20,924 INFO L226 Difference]: Without dead ends: 49 [2021-11-25 20:17:20,924 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 40 SyntacticMatches, 6 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 62 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=44, Invalid=66, Unknown=0, NotChecked=0, Total=110 [2021-11-25 20:17:20,927 INFO L933 BasicCegarLoop]: 6 mSDtfsCounter, 18 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 40 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 18 SdHoareTripleChecker+Valid, 18 SdHoareTripleChecker+Invalid, 47 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 40 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-25 20:17:20,927 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [18 Valid, 18 Invalid, 47 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 40 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-25 20:17:20,928 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2021-11-25 20:17:20,949 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 49. [2021-11-25 20:17:20,950 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 49 states, 48 states have (on average 1.25) internal successors, (60), 48 states have internal predecessors, (60), 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) [2021-11-25 20:17:20,952 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 60 transitions. [2021-11-25 20:17:20,953 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 60 transitions. Word has length 19 [2021-11-25 20:17:20,953 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:17:20,953 INFO L470 AbstractCegarLoop]: Abstraction has 49 states and 60 transitions. [2021-11-25 20:17:20,953 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 3.0) internal successors, (18), 5 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) [2021-11-25 20:17:20,953 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 60 transitions. [2021-11-25 20:17:20,954 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2021-11-25 20:17:20,954 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:17:20,955 INFO L514 BasicCegarLoop]: trace histogram [16, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:17:20,993 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_370ea4c9-fcf2-4465-b16d-c3b3fc1748b2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-25 20:17:21,172 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_370ea4c9-fcf2-4465-b16d-c3b3fc1748b2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:17:21,172 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:17:21,173 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:17:21,173 INFO L85 PathProgramCache]: Analyzing trace with hash 2101584963, now seen corresponding path program 3 times [2021-11-25 20:17:21,173 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:17:21,173 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [468180205] [2021-11-25 20:17:21,173 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:17:21,173 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:17:21,194 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-25 20:17:21,194 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1331392705] [2021-11-25 20:17:21,194 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 20:17:21,194 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:17:21,194 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_370ea4c9-fcf2-4465-b16d-c3b3fc1748b2/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:17:21,195 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_370ea4c9-fcf2-4465-b16d-c3b3fc1748b2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:17:21,216 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_370ea4c9-fcf2-4465-b16d-c3b3fc1748b2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-25 20:17:21,263 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 20:17:21,263 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:17:21,264 INFO L263 TraceCheckSpWp]: Trace formula consists of 85 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-25 20:17:21,266 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:17:21,366 INFO L134 CoverageAnalysis]: Checked inductivity of 211 backedges. 6 proven. 5 refuted. 0 times theorem prover too weak. 200 trivial. 0 not checked. [2021-11-25 20:17:21,366 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:17:21,469 INFO L134 CoverageAnalysis]: Checked inductivity of 211 backedges. 6 proven. 5 refuted. 0 times theorem prover too weak. 200 trivial. 0 not checked. [2021-11-25 20:17:21,470 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:17:21,470 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [468180205] [2021-11-25 20:17:21,470 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-25 20:17:21,470 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1331392705] [2021-11-25 20:17:21,470 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1331392705] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:17:21,471 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2111391298] [2021-11-25 20:17:21,473 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-25 20:17:21,473 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:17:21,473 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:17:21,474 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:17:21,474 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:17:21,491 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:17:21,492 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:17:21,547 INFO L354 Elim1Store]: treesize reduction 80, result has 29.8 percent of original size [2021-11-25 20:17:21,547 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 33 treesize of output 57 [2021-11-25 20:17:21,583 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:17:21,587 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:17:21,645 INFO L354 Elim1Store]: treesize reduction 98, result has 24.6 percent of original size [2021-11-25 20:17:21,646 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 6 select indices, 6 select index equivalence classes, 10 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 9 case distinctions, treesize of input 44 treesize of output 69 [2021-11-25 20:17:21,708 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:17:21,711 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 6 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 32 treesize of output 34 [2021-11-25 20:17:21,899 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:17:21,901 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:17:21,927 INFO L354 Elim1Store]: treesize reduction 100, result has 21.3 percent of original size [2021-11-25 20:17:21,928 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 331 treesize of output 324 [2021-11-25 20:17:22,085 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 21 treesize of output 17 [2021-11-25 20:17:22,115 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 21 treesize of output 17 [2021-11-25 20:17:22,270 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:17:22,278 INFO L354 Elim1Store]: treesize reduction 23, result has 36.1 percent of original size [2021-11-25 20:17:22,279 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 27 treesize of output 27 [2021-11-25 20:17:22,341 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:17:22,342 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:17:22,392 INFO L354 Elim1Store]: treesize reduction 188, result has 23.6 percent of original size [2021-11-25 20:17:22,393 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 6 case distinctions, treesize of input 110 treesize of output 129 [2021-11-25 20:17:22,487 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:17:22,497 INFO L354 Elim1Store]: treesize reduction 27, result has 38.6 percent of original size [2021-11-25 20:17:22,497 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 35 treesize of output 35 [2021-11-25 20:17:22,562 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:17:22,573 INFO L354 Elim1Store]: treesize reduction 27, result has 38.6 percent of original size [2021-11-25 20:17:22,573 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 35 treesize of output 35 [2021-11-25 20:17:22,614 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:17:23,155 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1151#(and (= |ULTIMATE.start_main_~i~0#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#A~0#1.base|) (+ |ULTIMATE.start_main_~#A~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| (* |ULTIMATE.start_main_~n~0#1| 4)) (* |ULTIMATE.start_main_~j~0#1| 4))) |ULTIMATE.start_main_#t~mem6#1|) (<= 0 |ULTIMATE.start_main_~#A~0#1.base|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_#t~mem7#1| |ULTIMATE.start_main_#t~mem6#1|) 1 0)) (= |ULTIMATE.start_main_~#A~0#1.offset| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#B~0#1.base|) (+ |ULTIMATE.start_main_~#B~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| (* |ULTIMATE.start_main_~n~0#1| 4)) (* |ULTIMATE.start_main_~j~0#1| 4))) |ULTIMATE.start_main_#t~mem7#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~#B~0#1.base|) (= |ULTIMATE.start_main_~j~0#1| 0) (= |ULTIMATE.start_main_~#B~0#1.offset| 0) (<= 0 |#StackHeapBarrier|) (= |ULTIMATE.start_main_~n~0#1| 1000) (= |#NULL.base| 0))' at error location [2021-11-25 20:17:23,155 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:17:23,155 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-25 20:17:23,155 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9] total 16 [2021-11-25 20:17:23,155 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1329738906] [2021-11-25 20:17:23,155 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-25 20:17:23,156 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-25 20:17:23,156 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:17:23,156 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-25 20:17:23,158 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=121, Invalid=299, Unknown=0, NotChecked=0, Total=420 [2021-11-25 20:17:23,158 INFO L87 Difference]: Start difference. First operand 49 states and 60 transitions. Second operand has 16 states, 16 states have (on average 1.5) internal successors, (24), 16 states have internal predecessors, (24), 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) [2021-11-25 20:17:23,584 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:17:23,584 INFO L93 Difference]: Finished difference Result 148 states and 173 transitions. [2021-11-25 20:17:23,585 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-11-25 20:17:23,585 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 1.5) internal successors, (24), 16 states have internal predecessors, (24), 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 37 [2021-11-25 20:17:23,585 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:17:23,587 INFO L225 Difference]: With dead ends: 148 [2021-11-25 20:17:23,587 INFO L226 Difference]: Without dead ends: 132 [2021-11-25 20:17:23,588 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 135 GetRequests, 93 SyntacticMatches, 6 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 502 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=416, Invalid=990, Unknown=0, NotChecked=0, Total=1406 [2021-11-25 20:17:23,589 INFO L933 BasicCegarLoop]: 12 mSDtfsCounter, 92 mSDsluCounter, 58 mSDsCounter, 0 mSdLazyCounter, 165 mSolverCounterSat, 140 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 92 SdHoareTripleChecker+Valid, 70 SdHoareTripleChecker+Invalid, 305 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 140 IncrementalHoareTripleChecker+Valid, 165 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-25 20:17:23,589 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [92 Valid, 70 Invalid, 305 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [140 Valid, 165 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-25 20:17:23,590 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 132 states. [2021-11-25 20:17:23,607 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 132 to 67. [2021-11-25 20:17:23,607 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 67 states, 66 states have (on average 1.2272727272727273) internal successors, (81), 66 states have internal predecessors, (81), 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) [2021-11-25 20:17:23,608 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 81 transitions. [2021-11-25 20:17:23,608 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 81 transitions. Word has length 37 [2021-11-25 20:17:23,609 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:17:23,609 INFO L470 AbstractCegarLoop]: Abstraction has 67 states and 81 transitions. [2021-11-25 20:17:23,609 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 1.5) internal successors, (24), 16 states have internal predecessors, (24), 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) [2021-11-25 20:17:23,609 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 81 transitions. [2021-11-25 20:17:23,611 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2021-11-25 20:17:23,611 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:17:23,611 INFO L514 BasicCegarLoop]: trace histogram [16, 16, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:17:23,650 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_370ea4c9-fcf2-4465-b16d-c3b3fc1748b2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-25 20:17:23,838 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_370ea4c9-fcf2-4465-b16d-c3b3fc1748b2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:17:23,839 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:17:23,839 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:17:23,839 INFO L85 PathProgramCache]: Analyzing trace with hash -1621711157, now seen corresponding path program 4 times [2021-11-25 20:17:23,840 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:17:23,840 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1628410462] [2021-11-25 20:17:23,840 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:17:23,840 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:17:23,882 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-25 20:17:23,883 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1743178877] [2021-11-25 20:17:23,883 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 20:17:23,883 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:17:23,883 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_370ea4c9-fcf2-4465-b16d-c3b3fc1748b2/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:17:23,900 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_370ea4c9-fcf2-4465-b16d-c3b3fc1748b2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:17:23,902 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_370ea4c9-fcf2-4465-b16d-c3b3fc1748b2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-25 20:17:24,015 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:17:24,017 INFO L263 TraceCheckSpWp]: Trace formula consists of 384 conjuncts, 7 conjunts are in the unsatisfiable core [2021-11-25 20:17:24,020 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:17:24,166 INFO L134 CoverageAnalysis]: Checked inductivity of 400 backedges. 79 proven. 10 refuted. 0 times theorem prover too weak. 311 trivial. 0 not checked. [2021-11-25 20:17:24,166 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:17:24,316 INFO L134 CoverageAnalysis]: Checked inductivity of 400 backedges. 79 proven. 10 refuted. 0 times theorem prover too weak. 311 trivial. 0 not checked. [2021-11-25 20:17:24,316 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:17:24,316 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1628410462] [2021-11-25 20:17:24,317 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-25 20:17:24,317 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1743178877] [2021-11-25 20:17:24,317 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1743178877] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:17:24,317 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1601400929] [2021-11-25 20:17:24,320 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-25 20:17:24,320 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:17:24,320 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:17:24,321 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:17:24,321 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:17:24,341 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:17:24,342 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:17:24,389 INFO L354 Elim1Store]: treesize reduction 80, result has 29.8 percent of original size [2021-11-25 20:17:24,390 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 33 treesize of output 57 [2021-11-25 20:17:24,411 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:17:24,415 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:17:24,458 INFO L354 Elim1Store]: treesize reduction 98, result has 24.6 percent of original size [2021-11-25 20:17:24,459 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 6 select indices, 6 select index equivalence classes, 10 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 9 case distinctions, treesize of input 44 treesize of output 69 [2021-11-25 20:17:24,528 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:17:24,529 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 6 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 36 treesize of output 38 [2021-11-25 20:17:24,707 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:17:24,709 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:17:24,711 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:17:24,729 INFO L354 Elim1Store]: treesize reduction 67, result has 9.5 percent of original size [2021-11-25 20:17:24,729 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 339 treesize of output 322 [2021-11-25 20:17:24,830 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 21 treesize of output 17 [2021-11-25 20:17:24,861 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 21 treesize of output 17 [2021-11-25 20:17:24,995 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:17:25,004 INFO L354 Elim1Store]: treesize reduction 27, result has 38.6 percent of original size [2021-11-25 20:17:25,005 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 35 treesize of output 35 [2021-11-25 20:17:25,081 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:17:25,082 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:17:25,083 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:17:25,084 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:17:25,085 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:17:25,098 INFO L354 Elim1Store]: treesize reduction 35, result has 32.7 percent of original size [2021-11-25 20:17:25,099 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 3 case distinctions, treesize of input 118 treesize of output 123 [2021-11-25 20:17:25,140 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:17:25,148 INFO L354 Elim1Store]: treesize reduction 27, result has 38.6 percent of original size [2021-11-25 20:17:25,148 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 35 treesize of output 35 [2021-11-25 20:17:25,174 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:17:25,183 INFO L354 Elim1Store]: treesize reduction 27, result has 38.6 percent of original size [2021-11-25 20:17:25,183 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 35 treesize of output 35 [2021-11-25 20:17:25,285 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:17:25,742 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1913#(and (= |ULTIMATE.start_main_~i~0#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#A~0#1.base|) (+ |ULTIMATE.start_main_~#A~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| (* |ULTIMATE.start_main_~n~0#1| 4)) (* |ULTIMATE.start_main_~j~0#1| 4))) |ULTIMATE.start_main_#t~mem6#1|) (<= 0 |ULTIMATE.start_main_~#A~0#1.base|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_#t~mem7#1| |ULTIMATE.start_main_#t~mem6#1|) 1 0)) (= |ULTIMATE.start_main_~#A~0#1.offset| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#B~0#1.base|) (+ |ULTIMATE.start_main_~#B~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| (* |ULTIMATE.start_main_~n~0#1| 4)) (* |ULTIMATE.start_main_~j~0#1| 4))) |ULTIMATE.start_main_#t~mem7#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~#B~0#1.base|) (= |ULTIMATE.start_main_~j~0#1| 0) (= |ULTIMATE.start_main_~#B~0#1.offset| 0) (<= 0 |#StackHeapBarrier|) (= |ULTIMATE.start_main_~n~0#1| 1000) (= |#NULL.base| 0))' at error location [2021-11-25 20:17:25,742 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:17:25,742 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-25 20:17:25,742 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7] total 13 [2021-11-25 20:17:25,742 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2004453811] [2021-11-25 20:17:25,743 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-25 20:17:25,743 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2021-11-25 20:17:25,743 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:17:25,744 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-11-25 20:17:25,744 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=147, Invalid=233, Unknown=0, NotChecked=0, Total=380 [2021-11-25 20:17:25,744 INFO L87 Difference]: Start difference. First operand 67 states and 81 transitions. Second operand has 14 states, 14 states have (on average 1.8571428571428572) internal successors, (26), 13 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) [2021-11-25 20:17:26,000 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:17:26,001 INFO L93 Difference]: Finished difference Result 212 states and 290 transitions. [2021-11-25 20:17:26,001 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-11-25 20:17:26,001 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 1.8571428571428572) internal successors, (26), 13 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) Word has length 55 [2021-11-25 20:17:26,002 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:17:26,003 INFO L225 Difference]: With dead ends: 212 [2021-11-25 20:17:26,003 INFO L226 Difference]: Without dead ends: 152 [2021-11-25 20:17:26,004 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 168 GetRequests, 144 SyntacticMatches, 1 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 224 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=232, Invalid=368, Unknown=0, NotChecked=0, Total=600 [2021-11-25 20:17:26,005 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 140 mSDsluCounter, 27 mSDsCounter, 0 mSdLazyCounter, 61 mSolverCounterSat, 129 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 140 SdHoareTripleChecker+Valid, 30 SdHoareTripleChecker+Invalid, 190 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 129 IncrementalHoareTripleChecker+Valid, 61 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-25 20:17:26,005 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [140 Valid, 30 Invalid, 190 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [129 Valid, 61 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-25 20:17:26,006 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 152 states. [2021-11-25 20:17:26,031 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 152 to 133. [2021-11-25 20:17:26,031 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 133 states, 132 states have (on average 1.1590909090909092) internal successors, (153), 132 states have internal predecessors, (153), 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) [2021-11-25 20:17:26,033 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 133 states to 133 states and 153 transitions. [2021-11-25 20:17:26,033 INFO L78 Accepts]: Start accepts. Automaton has 133 states and 153 transitions. Word has length 55 [2021-11-25 20:17:26,034 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:17:26,034 INFO L470 AbstractCegarLoop]: Abstraction has 133 states and 153 transitions. [2021-11-25 20:17:26,034 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 1.8571428571428572) internal successors, (26), 13 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) [2021-11-25 20:17:26,034 INFO L276 IsEmpty]: Start isEmpty. Operand 133 states and 153 transitions. [2021-11-25 20:17:26,036 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 104 [2021-11-25 20:17:26,036 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:17:26,036 INFO L514 BasicCegarLoop]: trace histogram [40, 40, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:17:26,065 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_370ea4c9-fcf2-4465-b16d-c3b3fc1748b2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-11-25 20:17:26,250 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_370ea4c9-fcf2-4465-b16d-c3b3fc1748b2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2021-11-25 20:17:26,250 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:17:26,251 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:17:26,251 INFO L85 PathProgramCache]: Analyzing trace with hash -1833412405, now seen corresponding path program 5 times [2021-11-25 20:17:26,251 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:17:26,251 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1853906221] [2021-11-25 20:17:26,251 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:17:26,251 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:17:26,286 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-25 20:17:26,286 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1244975864] [2021-11-25 20:17:26,286 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 20:17:26,287 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:17:26,287 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_370ea4c9-fcf2-4465-b16d-c3b3fc1748b2/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:17:26,288 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_370ea4c9-fcf2-4465-b16d-c3b3fc1748b2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:17:26,312 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_370ea4c9-fcf2-4465-b16d-c3b3fc1748b2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-11-25 20:17:39,188 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 13 check-sat command(s) [2021-11-25 20:17:39,188 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:17:39,212 INFO L263 TraceCheckSpWp]: Trace formula consists of 424 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-25 20:17:39,216 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:17:39,508 INFO L134 CoverageAnalysis]: Checked inductivity of 1912 backedges. 367 proven. 55 refuted. 0 times theorem prover too weak. 1490 trivial. 0 not checked. [2021-11-25 20:17:39,508 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:17:39,874 INFO L134 CoverageAnalysis]: Checked inductivity of 1912 backedges. 4 proven. 418 refuted. 0 times theorem prover too weak. 1490 trivial. 0 not checked. [2021-11-25 20:17:39,874 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:17:39,874 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1853906221] [2021-11-25 20:17:39,874 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-25 20:17:39,874 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1244975864] [2021-11-25 20:17:39,875 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1244975864] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:17:39,875 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1869614805] [2021-11-25 20:17:39,879 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-25 20:17:39,880 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:17:39,880 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:17:39,880 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:17:39,880 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:17:39,899 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:17:39,901 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:17:39,951 INFO L354 Elim1Store]: treesize reduction 98, result has 24.6 percent of original size [2021-11-25 20:17:39,952 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 6 select indices, 6 select index equivalence classes, 10 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 9 case distinctions, treesize of input 44 treesize of output 69 [2021-11-25 20:17:39,965 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:17:39,966 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:17:39,967 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 12 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 33 treesize of output 43 [2021-11-25 20:17:40,034 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:17:40,035 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 6 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 36 treesize of output 38 [2021-11-25 20:17:40,213 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:17:40,215 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:17:40,218 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:17:40,235 INFO L354 Elim1Store]: treesize reduction 67, result has 9.5 percent of original size [2021-11-25 20:17:40,235 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 339 treesize of output 322 [2021-11-25 20:17:40,323 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 21 treesize of output 17 [2021-11-25 20:17:40,352 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 21 treesize of output 17 [2021-11-25 20:17:40,524 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:17:40,535 INFO L354 Elim1Store]: treesize reduction 27, result has 38.6 percent of original size [2021-11-25 20:17:40,536 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 35 treesize of output 35 [2021-11-25 20:17:40,591 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:17:40,592 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:17:40,594 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:17:40,595 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:17:40,596 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:17:40,607 INFO L354 Elim1Store]: treesize reduction 35, result has 32.7 percent of original size [2021-11-25 20:17:40,607 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 3 case distinctions, treesize of input 118 treesize of output 123 [2021-11-25 20:17:40,666 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:17:40,676 INFO L354 Elim1Store]: treesize reduction 27, result has 38.6 percent of original size [2021-11-25 20:17:40,677 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 35 treesize of output 35 [2021-11-25 20:17:40,703 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:17:40,712 INFO L354 Elim1Store]: treesize reduction 27, result has 38.6 percent of original size [2021-11-25 20:17:40,712 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 35 treesize of output 35 [2021-11-25 20:17:40,791 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:17:41,239 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3207#(and (= |ULTIMATE.start_main_~i~0#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#A~0#1.base|) (+ |ULTIMATE.start_main_~#A~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| (* |ULTIMATE.start_main_~n~0#1| 4)) (* |ULTIMATE.start_main_~j~0#1| 4))) |ULTIMATE.start_main_#t~mem6#1|) (<= 0 |ULTIMATE.start_main_~#A~0#1.base|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_#t~mem7#1| |ULTIMATE.start_main_#t~mem6#1|) 1 0)) (= |ULTIMATE.start_main_~#A~0#1.offset| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#B~0#1.base|) (+ |ULTIMATE.start_main_~#B~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| (* |ULTIMATE.start_main_~n~0#1| 4)) (* |ULTIMATE.start_main_~j~0#1| 4))) |ULTIMATE.start_main_#t~mem7#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~#B~0#1.base|) (= |ULTIMATE.start_main_~j~0#1| 0) (= |ULTIMATE.start_main_~#B~0#1.offset| 0) (<= 0 |#StackHeapBarrier|) (= |ULTIMATE.start_main_~n~0#1| 1000) (= |#NULL.base| 0))' at error location [2021-11-25 20:17:41,239 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:17:41,239 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-25 20:17:41,239 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 25 [2021-11-25 20:17:41,239 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1598052459] [2021-11-25 20:17:41,239 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-25 20:17:41,240 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2021-11-25 20:17:41,240 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:17:41,240 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-11-25 20:17:41,241 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=405, Invalid=587, Unknown=0, NotChecked=0, Total=992 [2021-11-25 20:17:41,241 INFO L87 Difference]: Start difference. First operand 133 states and 153 transitions. Second operand has 26 states, 26 states have (on average 1.5769230769230769) internal successors, (41), 25 states have internal predecessors, (41), 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) [2021-11-25 20:17:41,803 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:17:41,803 INFO L93 Difference]: Finished difference Result 428 states and 566 transitions. [2021-11-25 20:17:41,804 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-11-25 20:17:41,804 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 1.5769230769230769) internal successors, (41), 25 states have internal predecessors, (41), 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 103 [2021-11-25 20:17:41,804 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:17:41,806 INFO L225 Difference]: With dead ends: 428 [2021-11-25 20:17:41,806 INFO L226 Difference]: Without dead ends: 308 [2021-11-25 20:17:41,808 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 318 GetRequests, 276 SyntacticMatches, 1 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 614 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=724, Invalid=1082, Unknown=0, NotChecked=0, Total=1806 [2021-11-25 20:17:41,809 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 348 mSDsluCounter, 63 mSDsCounter, 0 mSdLazyCounter, 106 mSolverCounterSat, 243 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 348 SdHoareTripleChecker+Valid, 66 SdHoareTripleChecker+Invalid, 349 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 243 IncrementalHoareTripleChecker+Valid, 106 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-25 20:17:41,809 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [348 Valid, 66 Invalid, 349 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [243 Valid, 106 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-25 20:17:41,810 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 308 states. [2021-11-25 20:17:41,851 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 308 to 265. [2021-11-25 20:17:41,852 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 265 states, 264 states have (on average 1.125) internal successors, (297), 264 states have internal predecessors, (297), 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) [2021-11-25 20:17:41,854 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 265 states to 265 states and 297 transitions. [2021-11-25 20:17:41,855 INFO L78 Accepts]: Start accepts. Automaton has 265 states and 297 transitions. Word has length 103 [2021-11-25 20:17:41,855 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:17:41,855 INFO L470 AbstractCegarLoop]: Abstraction has 265 states and 297 transitions. [2021-11-25 20:17:41,855 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 26 states have (on average 1.5769230769230769) internal successors, (41), 25 states have internal predecessors, (41), 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) [2021-11-25 20:17:41,856 INFO L276 IsEmpty]: Start isEmpty. Operand 265 states and 297 transitions. [2021-11-25 20:17:41,859 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 200 [2021-11-25 20:17:41,859 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:17:41,860 INFO L514 BasicCegarLoop]: trace histogram [88, 88, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:17:41,892 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_370ea4c9-fcf2-4465-b16d-c3b3fc1748b2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-11-25 20:17:42,086 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_370ea4c9-fcf2-4465-b16d-c3b3fc1748b2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable7 [2021-11-25 20:17:42,086 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:17:42,087 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:17:42,087 INFO L85 PathProgramCache]: Analyzing trace with hash 841137355, now seen corresponding path program 6 times [2021-11-25 20:17:42,087 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:17:42,087 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [102472684] [2021-11-25 20:17:42,087 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:17:42,087 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:17:42,138 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-25 20:17:42,138 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [591643333] [2021-11-25 20:17:42,138 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-25 20:17:42,139 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:17:42,139 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_370ea4c9-fcf2-4465-b16d-c3b3fc1748b2/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:17:42,140 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_370ea4c9-fcf2-4465-b16d-c3b3fc1748b2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:17:42,188 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_370ea4c9-fcf2-4465-b16d-c3b3fc1748b2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-11-25 20:17:42,447 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-25 20:17:42,448 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-25 20:17:42,452 INFO L263 TraceCheckSpWp]: Trace formula consists of 691 conjuncts, 29 conjunts are in the unsatisfiable core [2021-11-25 20:17:42,459 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:17:43,314 INFO L134 CoverageAnalysis]: Checked inductivity of 8392 backedges. 231 proven. 3206 refuted. 0 times theorem prover too weak. 4955 trivial. 0 not checked. [2021-11-25 20:17:43,314 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:17:44,078 INFO L134 CoverageAnalysis]: Checked inductivity of 8392 backedges. 231 proven. 3206 refuted. 0 times theorem prover too weak. 4955 trivial. 0 not checked. [2021-11-25 20:17:44,078 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:17:44,079 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [102472684] [2021-11-25 20:17:44,079 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-25 20:17:44,079 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [591643333] [2021-11-25 20:17:44,079 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [591643333] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:17:44,079 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [491795256] [2021-11-25 20:17:44,081 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-25 20:17:44,082 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:17:44,082 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:17:44,082 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:17:44,082 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:17:44,108 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:17:44,110 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:17:44,160 INFO L354 Elim1Store]: treesize reduction 98, result has 24.6 percent of original size [2021-11-25 20:17:44,160 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 6 select indices, 6 select index equivalence classes, 10 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 9 case distinctions, treesize of input 44 treesize of output 69 [2021-11-25 20:17:44,186 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:17:44,187 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:17:44,188 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 12 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 33 treesize of output 43 [2021-11-25 20:17:44,232 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:17:44,235 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 6 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 36 treesize of output 38 [2021-11-25 20:17:44,442 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:17:44,445 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:17:44,447 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:17:44,461 INFO L354 Elim1Store]: treesize reduction 67, result has 9.5 percent of original size [2021-11-25 20:17:44,461 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 339 treesize of output 322 [2021-11-25 20:17:44,526 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 21 treesize of output 17 [2021-11-25 20:17:44,553 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 21 treesize of output 17 [2021-11-25 20:17:44,703 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:17:44,712 INFO L354 Elim1Store]: treesize reduction 27, result has 38.6 percent of original size [2021-11-25 20:17:44,713 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 35 treesize of output 35 [2021-11-25 20:17:44,796 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:17:44,797 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:17:44,799 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:17:44,800 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:17:44,801 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:17:44,816 INFO L354 Elim1Store]: treesize reduction 35, result has 32.7 percent of original size [2021-11-25 20:17:44,816 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 3 case distinctions, treesize of input 118 treesize of output 123 [2021-11-25 20:17:44,856 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:17:44,865 INFO L354 Elim1Store]: treesize reduction 27, result has 38.6 percent of original size [2021-11-25 20:17:44,866 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 35 treesize of output 35 [2021-11-25 20:17:44,893 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:17:44,901 INFO L354 Elim1Store]: treesize reduction 27, result has 38.6 percent of original size [2021-11-25 20:17:44,902 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 35 treesize of output 35 [2021-11-25 20:17:44,991 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:17:45,717 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5763#(and (= |ULTIMATE.start_main_~i~0#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#A~0#1.base|) (+ |ULTIMATE.start_main_~#A~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| (* |ULTIMATE.start_main_~n~0#1| 4)) (* |ULTIMATE.start_main_~j~0#1| 4))) |ULTIMATE.start_main_#t~mem6#1|) (<= 0 |ULTIMATE.start_main_~#A~0#1.base|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_#t~mem7#1| |ULTIMATE.start_main_#t~mem6#1|) 1 0)) (= |ULTIMATE.start_main_~#A~0#1.offset| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#B~0#1.base|) (+ |ULTIMATE.start_main_~#B~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| (* |ULTIMATE.start_main_~n~0#1| 4)) (* |ULTIMATE.start_main_~j~0#1| 4))) |ULTIMATE.start_main_#t~mem7#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~#B~0#1.base|) (= |ULTIMATE.start_main_~j~0#1| 0) (= |ULTIMATE.start_main_~#B~0#1.offset| 0) (<= 0 |#StackHeapBarrier|) (= |ULTIMATE.start_main_~n~0#1| 1000) (= |#NULL.base| 0))' at error location [2021-11-25 20:17:45,717 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:17:45,717 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-25 20:17:45,717 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 30] total 58 [2021-11-25 20:17:45,717 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1467551721] [2021-11-25 20:17:45,717 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-25 20:17:45,718 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 58 states [2021-11-25 20:17:45,718 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:17:45,719 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 58 interpolants. [2021-11-25 20:17:45,721 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1262, Invalid=2770, Unknown=0, NotChecked=0, Total=4032 [2021-11-25 20:17:45,721 INFO L87 Difference]: Start difference. First operand 265 states and 297 transitions. Second operand has 58 states, 58 states have (on average 1.3448275862068966) internal successors, (78), 58 states have internal predecessors, (78), 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) [2021-11-25 20:17:49,208 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:17:49,208 INFO L93 Difference]: Finished difference Result 1487 states and 1700 transitions. [2021-11-25 20:17:49,208 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 112 states. [2021-11-25 20:17:49,209 INFO L78 Accepts]: Start accepts. Automaton has has 58 states, 58 states have (on average 1.3448275862068966) internal successors, (78), 58 states have internal predecessors, (78), 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 199 [2021-11-25 20:17:49,209 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:17:49,216 INFO L225 Difference]: With dead ends: 1487 [2021-11-25 20:17:49,216 INFO L226 Difference]: Without dead ends: 1320 [2021-11-25 20:17:49,229 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 756 GetRequests, 589 SyntacticMatches, 1 SemanticMatches, 166 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10864 ImplicationChecksByTransitivity, 3.6s TimeCoverageRelationStatistics Valid=8545, Invalid=19511, Unknown=0, NotChecked=0, Total=28056 [2021-11-25 20:17:49,230 INFO L933 BasicCegarLoop]: 66 mSDtfsCounter, 459 mSDsluCounter, 607 mSDsCounter, 0 mSdLazyCounter, 1015 mSolverCounterSat, 487 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 459 SdHoareTripleChecker+Valid, 673 SdHoareTripleChecker+Invalid, 1502 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 487 IncrementalHoareTripleChecker+Valid, 1015 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2021-11-25 20:17:49,230 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [459 Valid, 673 Invalid, 1502 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [487 Valid, 1015 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2021-11-25 20:17:49,232 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1320 states. [2021-11-25 20:17:49,318 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1320 to 553. [2021-11-25 20:17:49,320 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 553 states, 552 states have (on average 1.0815217391304348) internal successors, (597), 552 states have internal predecessors, (597), 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) [2021-11-25 20:17:49,323 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 553 states to 553 states and 597 transitions. [2021-11-25 20:17:49,323 INFO L78 Accepts]: Start accepts. Automaton has 553 states and 597 transitions. Word has length 199 [2021-11-25 20:17:49,324 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:17:49,324 INFO L470 AbstractCegarLoop]: Abstraction has 553 states and 597 transitions. [2021-11-25 20:17:49,324 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 58 states, 58 states have (on average 1.3448275862068966) internal successors, (78), 58 states have internal predecessors, (78), 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) [2021-11-25 20:17:49,324 INFO L276 IsEmpty]: Start isEmpty. Operand 553 states and 597 transitions. [2021-11-25 20:17:49,336 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 488 [2021-11-25 20:17:49,337 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:17:49,337 INFO L514 BasicCegarLoop]: trace histogram [220, 220, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:17:49,372 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_370ea4c9-fcf2-4465-b16d-c3b3fc1748b2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2021-11-25 20:17:49,562 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_370ea4c9-fcf2-4465-b16d-c3b3fc1748b2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:17:49,562 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:17:49,562 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:17:49,563 INFO L85 PathProgramCache]: Analyzing trace with hash 633503579, now seen corresponding path program 7 times [2021-11-25 20:17:49,563 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:17:49,563 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1138116726] [2021-11-25 20:17:49,563 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:17:49,563 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:17:49,679 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-25 20:17:49,679 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1970813141] [2021-11-25 20:17:49,679 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-25 20:17:49,679 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:17:49,679 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_370ea4c9-fcf2-4465-b16d-c3b3fc1748b2/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:17:49,686 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_370ea4c9-fcf2-4465-b16d-c3b3fc1748b2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:17:49,692 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_370ea4c9-fcf2-4465-b16d-c3b3fc1748b2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-11-25 20:17:50,499 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-25 20:17:50,515 INFO L263 TraceCheckSpWp]: Trace formula consists of 3720 conjuncts, 25 conjunts are in the unsatisfiable core [2021-11-25 20:17:50,528 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-25 20:17:51,412 INFO L134 CoverageAnalysis]: Checked inductivity of 52780 backedges. 4771 proven. 253 refuted. 0 times theorem prover too weak. 47756 trivial. 0 not checked. [2021-11-25 20:17:51,413 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-25 20:17:52,864 INFO L134 CoverageAnalysis]: Checked inductivity of 52780 backedges. 4771 proven. 253 refuted. 0 times theorem prover too weak. 47756 trivial. 0 not checked. [2021-11-25 20:17:52,865 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-25 20:17:52,865 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1138116726] [2021-11-25 20:17:52,865 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: SMT_SOLVER_CANNOT_INTERPOLATE_INPUT [2021-11-25 20:17:52,865 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1970813141] [2021-11-25 20:17:52,865 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1970813141] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-25 20:17:52,866 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [667404608] [2021-11-25 20:17:52,868 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-25 20:17:52,869 INFO L166 IcfgInterpreter]: Building call graph [2021-11-25 20:17:52,869 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-25 20:17:52,869 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-25 20:17:52,869 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-25 20:17:52,891 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:17:52,894 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:17:52,949 INFO L354 Elim1Store]: treesize reduction 98, result has 24.6 percent of original size [2021-11-25 20:17:52,950 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 6 select indices, 6 select index equivalence classes, 10 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 9 case distinctions, treesize of input 44 treesize of output 69 [2021-11-25 20:17:52,964 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:17:52,965 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:17:52,966 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 12 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 33 treesize of output 43 [2021-11-25 20:17:53,024 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:17:53,025 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 6 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 36 treesize of output 38 [2021-11-25 20:17:53,196 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:17:53,198 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:17:53,200 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-25 20:17:53,218 INFO L354 Elim1Store]: treesize reduction 67, result has 9.5 percent of original size [2021-11-25 20:17:53,219 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 339 treesize of output 322 [2021-11-25 20:17:53,328 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 21 treesize of output 17 [2021-11-25 20:17:53,363 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 21 treesize of output 17 [2021-11-25 20:17:53,495 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:17:53,506 INFO L354 Elim1Store]: treesize reduction 23, result has 36.1 percent of original size [2021-11-25 20:17:53,508 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 27 treesize of output 27 [2021-11-25 20:17:53,558 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:17:53,559 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:17:53,617 INFO L354 Elim1Store]: treesize reduction 178, result has 27.6 percent of original size [2021-11-25 20:17:53,618 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 6 case distinctions, treesize of input 110 treesize of output 139 [2021-11-25 20:17:53,717 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:17:53,726 INFO L354 Elim1Store]: treesize reduction 27, result has 38.6 percent of original size [2021-11-25 20:17:53,727 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 35 treesize of output 35 [2021-11-25 20:17:53,772 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-25 20:17:53,783 INFO L354 Elim1Store]: treesize reduction 27, result has 38.6 percent of original size [2021-11-25 20:17:53,783 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 35 treesize of output 35 [2021-11-25 20:17:53,826 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-25 20:17:59,989 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '12654#(and (= |ULTIMATE.start_main_~i~0#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#A~0#1.base|) (+ |ULTIMATE.start_main_~#A~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| (* |ULTIMATE.start_main_~n~0#1| 4)) (* |ULTIMATE.start_main_~j~0#1| 4))) |ULTIMATE.start_main_#t~mem6#1|) (<= 0 |ULTIMATE.start_main_~#A~0#1.base|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| (ite (= |ULTIMATE.start_main_#t~mem7#1| |ULTIMATE.start_main_#t~mem6#1|) 1 0)) (= |ULTIMATE.start_main_~#A~0#1.offset| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#B~0#1.base|) (+ |ULTIMATE.start_main_~#B~0#1.offset| (* |ULTIMATE.start_main_~i~0#1| (* |ULTIMATE.start_main_~n~0#1| 4)) (* |ULTIMATE.start_main_~j~0#1| 4))) |ULTIMATE.start_main_#t~mem7#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| |ULTIMATE.start___VERIFIER_assert_#in~cond#1|) (= |#NULL.offset| 0) (<= 0 |ULTIMATE.start_main_~#B~0#1.base|) (= |ULTIMATE.start_main_~j~0#1| 0) (= |ULTIMATE.start_main_~#B~0#1.offset| 0) (<= 0 |#StackHeapBarrier|) (= |ULTIMATE.start_main_~n~0#1| 1000) (= |#NULL.base| 0))' at error location [2021-11-25 20:17:59,989 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-25 20:17:59,989 INFO L186 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2021-11-25 20:17:59,990 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25] total 49 [2021-11-25 20:17:59,990 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [813191793] [2021-11-25 20:17:59,990 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2021-11-25 20:17:59,991 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 50 states [2021-11-25 20:17:59,991 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-25 20:17:59,992 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2021-11-25 20:17:59,993 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1344, Invalid=1626, Unknown=0, NotChecked=0, Total=2970 [2021-11-25 20:17:59,993 INFO L87 Difference]: Start difference. First operand 553 states and 597 transitions. Second operand has 50 states, 50 states have (on average 1.24) internal successors, (62), 49 states have internal predecessors, (62), 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) [2021-11-25 20:18:02,071 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-25 20:18:02,071 INFO L93 Difference]: Finished difference Result 1724 states and 2294 transitions. [2021-11-25 20:18:02,072 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2021-11-25 20:18:02,072 INFO L78 Accepts]: Start accepts. Automaton has has 50 states, 50 states have (on average 1.24) internal successors, (62), 49 states have internal predecessors, (62), 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 487 [2021-11-25 20:18:02,072 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-25 20:18:02,078 INFO L225 Difference]: With dead ends: 1724 [2021-11-25 20:18:02,079 INFO L226 Difference]: Without dead ends: 1196 [2021-11-25 20:18:02,082 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1482 GetRequests, 1175 SyntacticMatches, 231 SemanticMatches, 76 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17830 ImplicationChecksByTransitivity, 8.2s TimeCoverageRelationStatistics Valid=2563, Invalid=3443, Unknown=0, NotChecked=0, Total=6006 [2021-11-25 20:18:02,083 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 804 mSDsluCounter, 135 mSDsCounter, 0 mSdLazyCounter, 214 mSolverCounterSat, 590 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 804 SdHoareTripleChecker+Valid, 138 SdHoareTripleChecker+Invalid, 804 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 590 IncrementalHoareTripleChecker+Valid, 214 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-25 20:18:02,084 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [804 Valid, 138 Invalid, 804 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [590 Valid, 214 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2021-11-25 20:18:02,086 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1196 states. [2021-11-25 20:18:02,235 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1196 to 1105. [2021-11-25 20:18:02,238 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1105 states, 1104 states have (on average 1.0625) internal successors, (1173), 1104 states have internal predecessors, (1173), 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) [2021-11-25 20:18:02,242 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1105 states to 1105 states and 1173 transitions. [2021-11-25 20:18:02,242 INFO L78 Accepts]: Start accepts. Automaton has 1105 states and 1173 transitions. Word has length 487 [2021-11-25 20:18:02,245 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-25 20:18:02,245 INFO L470 AbstractCegarLoop]: Abstraction has 1105 states and 1173 transitions. [2021-11-25 20:18:02,245 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 50 states, 50 states have (on average 1.24) internal successors, (62), 49 states have internal predecessors, (62), 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) [2021-11-25 20:18:02,245 INFO L276 IsEmpty]: Start isEmpty. Operand 1105 states and 1173 transitions. [2021-11-25 20:18:02,287 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 968 [2021-11-25 20:18:02,287 INFO L506 BasicCegarLoop]: Found error trace [2021-11-25 20:18:02,288 INFO L514 BasicCegarLoop]: trace histogram [460, 460, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1] [2021-11-25 20:18:02,334 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_370ea4c9-fcf2-4465-b16d-c3b3fc1748b2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2021-11-25 20:18:02,514 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_370ea4c9-fcf2-4465-b16d-c3b3fc1748b2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2021-11-25 20:18:02,514 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-25 20:18:02,514 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-25 20:18:02,515 INFO L85 PathProgramCache]: Analyzing trace with hash -1638071461, now seen corresponding path program 8 times [2021-11-25 20:18:02,515 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-25 20:18:02,515 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2008626877] [2021-11-25 20:18:02,515 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-25 20:18:02,515 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-25 20:18:02,763 ERROR L247 FreeRefinementEngine]: Caught known exception: Unsupported non-linear arithmetic [2021-11-25 20:18:02,763 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleZ3 [1466391082] [2021-11-25 20:18:02,764 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-25 20:18:02,764 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-25 20:18:02,764 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_370ea4c9-fcf2-4465-b16d-c3b3fc1748b2/bin/utaipan-eEHZpOm5b7/z3 [2021-11-25 20:18:02,766 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_370ea4c9-fcf2-4465-b16d-c3b3fc1748b2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-25 20:18:02,792 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_370ea4c9-fcf2-4465-b16d-c3b3fc1748b2/bin/utaipan-eEHZpOm5b7/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process