./Ultimate.py --spec ../../sv-benchmarks/c/properties/valid-memsafety.prp --file ../../sv-benchmarks/c/loop-acceleration/array3.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for memory safety (deref-memtrack) Using default analysis Version 53f42b1a Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_05bfa4f4-06e3-4fa5-985d-771be0ff54c3/bin/utaipan-TEXQjIfE4P/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_05bfa4f4-06e3-4fa5-985d-771be0ff54c3/bin/utaipan-TEXQjIfE4P/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_05bfa4f4-06e3-4fa5-985d-771be0ff54c3/bin/utaipan-TEXQjIfE4P/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_05bfa4f4-06e3-4fa5-985d-771be0ff54c3/bin/utaipan-TEXQjIfE4P/config/TaipanMemDerefMemtrack.xml -i ../../sv-benchmarks/c/loop-acceleration/array3.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_05bfa4f4-06e3-4fa5-985d-771be0ff54c3/bin/utaipan-TEXQjIfE4P/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_05bfa4f4-06e3-4fa5-985d-771be0ff54c3/bin/utaipan-TEXQjIfE4P --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 9dfb76d38495bc50f893b9a1fbc1c4079ae42ab458f1c235795d8ebc0da579ea --- Real Ultimate output --- This is Ultimate 0.2.1-dev-53f42b1 [2021-11-21 00:13:17,952 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-21 00:13:17,954 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-21 00:13:18,000 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-21 00:13:18,000 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-21 00:13:18,005 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-21 00:13:18,006 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-21 00:13:18,010 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-21 00:13:18,012 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-21 00:13:18,018 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-21 00:13:18,019 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-21 00:13:18,021 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-21 00:13:18,021 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-21 00:13:18,023 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-21 00:13:18,025 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-21 00:13:18,032 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-21 00:13:18,034 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-21 00:13:18,036 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-21 00:13:18,038 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-21 00:13:18,047 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-21 00:13:18,048 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-21 00:13:18,050 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-21 00:13:18,053 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-21 00:13:18,054 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-21 00:13:18,063 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-21 00:13:18,063 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-21 00:13:18,063 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-21 00:13:18,066 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-21 00:13:18,069 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-21 00:13:18,071 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-21 00:13:18,072 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-21 00:13:18,073 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-21 00:13:18,075 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-21 00:13:18,076 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-21 00:13:18,078 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-21 00:13:18,078 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-21 00:13:18,078 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-21 00:13:18,079 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-21 00:13:18,079 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-21 00:13:18,080 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-21 00:13:18,081 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-21 00:13:18,082 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_05bfa4f4-06e3-4fa5-985d-771be0ff54c3/bin/utaipan-TEXQjIfE4P/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Default.epf [2021-11-21 00:13:18,126 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-21 00:13:18,126 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-21 00:13:18,126 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-21 00:13:18,126 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-21 00:13:18,127 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-21 00:13:18,127 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-21 00:13:18,127 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-21 00:13:18,134 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-21 00:13:18,134 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-21 00:13:18,134 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-21 00:13:18,135 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-21 00:13:18,135 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-21 00:13:18,135 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-21 00:13:18,136 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-21 00:13:18,136 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-21 00:13:18,136 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-21 00:13:18,136 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-21 00:13:18,137 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-21 00:13:18,137 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-11-21 00:13:18,137 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-11-21 00:13:18,138 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-21 00:13:18,138 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-21 00:13:18,138 INFO L138 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2021-11-21 00:13:18,140 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-21 00:13:18,140 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-21 00:13:18,140 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-21 00:13:18,140 INFO L138 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2021-11-21 00:13:18,141 INFO L138 SettingsManager]: * Bitprecise bitfields=true [2021-11-21 00:13:18,141 INFO L138 SettingsManager]: * SV-COMP memtrack compatibility mode=true [2021-11-21 00:13:18,141 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-21 00:13:18,141 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-11-21 00:13:18,141 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-21 00:13:18,142 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-21 00:13:18,142 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-21 00:13:18,142 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-21 00:13:18,142 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-21 00:13:18,142 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-21 00:13:18,143 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-21 00:13:18,143 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-21 00:13:18,143 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-21 00:13:18,143 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-21 00:13:18,143 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-21 00:13:18,144 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_05bfa4f4-06e3-4fa5-985d-771be0ff54c3/bin/utaipan-TEXQjIfE4P/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_05bfa4f4-06e3-4fa5-985d-771be0ff54c3/bin/utaipan-TEXQjIfE4P Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 9dfb76d38495bc50f893b9a1fbc1c4079ae42ab458f1c235795d8ebc0da579ea [2021-11-21 00:13:18,436 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-21 00:13:18,464 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-21 00:13:18,466 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-21 00:13:18,466 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-21 00:13:18,468 INFO L275 PluginConnector]: CDTParser initialized [2021-11-21 00:13:18,469 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_05bfa4f4-06e3-4fa5-985d-771be0ff54c3/bin/utaipan-TEXQjIfE4P/../../sv-benchmarks/c/loop-acceleration/array3.i [2021-11-21 00:13:18,540 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_05bfa4f4-06e3-4fa5-985d-771be0ff54c3/bin/utaipan-TEXQjIfE4P/data/3905a615c/f4f844c47361478287f9517df8ecb012/FLAG8390e4857 [2021-11-21 00:13:18,996 INFO L306 CDTParser]: Found 1 translation units. [2021-11-21 00:13:18,996 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_05bfa4f4-06e3-4fa5-985d-771be0ff54c3/sv-benchmarks/c/loop-acceleration/array3.i [2021-11-21 00:13:19,006 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_05bfa4f4-06e3-4fa5-985d-771be0ff54c3/bin/utaipan-TEXQjIfE4P/data/3905a615c/f4f844c47361478287f9517df8ecb012/FLAG8390e4857 [2021-11-21 00:13:19,391 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_05bfa4f4-06e3-4fa5-985d-771be0ff54c3/bin/utaipan-TEXQjIfE4P/data/3905a615c/f4f844c47361478287f9517df8ecb012 [2021-11-21 00:13:19,393 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-21 00:13:19,394 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-21 00:13:19,396 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-21 00:13:19,396 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-21 00:13:19,399 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-21 00:13:19,400 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.11 12:13:19" (1/1) ... [2021-11-21 00:13:19,401 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@17ef956f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:13:19, skipping insertion in model container [2021-11-21 00:13:19,401 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.11 12:13:19" (1/1) ... [2021-11-21 00:13:19,418 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-21 00:13:19,439 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-21 00:13:19,638 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_05bfa4f4-06e3-4fa5-985d-771be0ff54c3/sv-benchmarks/c/loop-acceleration/array3.i[846,859] [2021-11-21 00:13:19,654 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-21 00:13:19,682 INFO L203 MainTranslator]: Completed pre-run [2021-11-21 00:13:19,695 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_05bfa4f4-06e3-4fa5-985d-771be0ff54c3/sv-benchmarks/c/loop-acceleration/array3.i[846,859] [2021-11-21 00:13:19,702 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-21 00:13:19,719 INFO L208 MainTranslator]: Completed translation [2021-11-21 00:13:19,720 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:13:19 WrapperNode [2021-11-21 00:13:19,720 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-21 00:13:19,722 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-21 00:13:19,722 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-21 00:13:19,722 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-21 00:13:19,730 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:13:19" (1/1) ... [2021-11-21 00:13:19,738 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:13:19" (1/1) ... [2021-11-21 00:13:19,760 INFO L137 Inliner]: procedures = 16, calls = 11, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 44 [2021-11-21 00:13:19,761 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-21 00:13:19,762 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-21 00:13:19,762 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-21 00:13:19,762 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-21 00:13:19,770 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:13:19" (1/1) ... [2021-11-21 00:13:19,771 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:13:19" (1/1) ... [2021-11-21 00:13:19,782 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:13:19" (1/1) ... [2021-11-21 00:13:19,783 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:13:19" (1/1) ... [2021-11-21 00:13:19,795 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:13:19" (1/1) ... [2021-11-21 00:13:19,801 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:13:19" (1/1) ... [2021-11-21 00:13:19,803 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:13:19" (1/1) ... [2021-11-21 00:13:19,809 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-21 00:13:19,811 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-21 00:13:19,812 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-21 00:13:19,812 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-21 00:13:19,813 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:13:19" (1/1) ... [2021-11-21 00:13:19,820 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-21 00:13:19,835 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_05bfa4f4-06e3-4fa5-985d-771be0ff54c3/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:13:19,854 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_05bfa4f4-06e3-4fa5-985d-771be0ff54c3/bin/utaipan-TEXQjIfE4P/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-21 00:13:19,871 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_05bfa4f4-06e3-4fa5-985d-771be0ff54c3/bin/utaipan-TEXQjIfE4P/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-21 00:13:19,904 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-21 00:13:19,905 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-21 00:13:19,905 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-11-21 00:13:19,905 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-11-21 00:13:19,906 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-21 00:13:19,906 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-21 00:13:19,906 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-11-21 00:13:19,906 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-11-21 00:13:19,976 INFO L236 CfgBuilder]: Building ICFG [2021-11-21 00:13:19,978 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-21 00:13:20,149 INFO L277 CfgBuilder]: Performing block encoding [2021-11-21 00:13:20,191 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-21 00:13:20,192 INFO L301 CfgBuilder]: Removed 2 assume(true) statements. [2021-11-21 00:13:20,194 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.11 12:13:20 BoogieIcfgContainer [2021-11-21 00:13:20,194 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-21 00:13:20,196 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-21 00:13:20,196 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-21 00:13:20,200 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-21 00:13:20,201 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.11 12:13:19" (1/3) ... [2021-11-21 00:13:20,201 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@d532148 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.11 12:13:20, skipping insertion in model container [2021-11-21 00:13:20,202 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 12:13:19" (2/3) ... [2021-11-21 00:13:20,202 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@d532148 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.11 12:13:20, skipping insertion in model container [2021-11-21 00:13:20,202 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.11 12:13:20" (3/3) ... [2021-11-21 00:13:20,204 INFO L111 eAbstractionObserver]: Analyzing ICFG array3.i [2021-11-21 00:13:20,209 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-21 00:13:20,209 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 6 error locations. [2021-11-21 00:13:20,254 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-21 00:13:20,262 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=false, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=All, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mLoopAccelerationTechnique=FAST_UPR [2021-11-21 00:13:20,263 INFO L340 AbstractCegarLoop]: Starting to check reachability of 6 error locations. [2021-11-21 00:13:20,277 INFO L276 IsEmpty]: Start isEmpty. Operand has 18 states, 11 states have (on average 2.0) internal successors, (22), 17 states have internal predecessors, (22), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:13:20,284 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2021-11-21 00:13:20,284 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:13:20,285 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1] [2021-11-21 00:13:20,286 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr2REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 2 more)] === [2021-11-21 00:13:20,291 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:13:20,291 INFO L85 PathProgramCache]: Analyzing trace with hash 88499, now seen corresponding path program 1 times [2021-11-21 00:13:20,301 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:13:20,312 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1943813992] [2021-11-21 00:13:20,313 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:13:20,314 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:13:20,442 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:13:20,526 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:13:20,527 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:13:20,527 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1943813992] [2021-11-21 00:13:20,528 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1943813992] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:13:20,528 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 00:13:20,529 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-21 00:13:20,531 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [650149880] [2021-11-21 00:13:20,531 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:13:20,536 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-21 00:13:20,536 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:13:20,561 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-21 00:13:20,562 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-21 00:13:20,564 INFO L87 Difference]: Start difference. First operand has 18 states, 11 states have (on average 2.0) internal successors, (22), 17 states have internal predecessors, (22), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 3 states, 3 states have (on average 1.0) internal successors, (3), 2 states have internal predecessors, (3), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:13:20,646 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:13:20,647 INFO L93 Difference]: Finished difference Result 35 states and 37 transitions. [2021-11-21 00:13:20,648 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-21 00:13:20,649 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 1.0) internal successors, (3), 2 states have internal predecessors, (3), 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 3 [2021-11-21 00:13:20,650 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:13:20,658 INFO L225 Difference]: With dead ends: 35 [2021-11-21 00:13:20,658 INFO L226 Difference]: Without dead ends: 33 [2021-11-21 00:13:20,660 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-21 00:13:20,665 INFO L933 BasicCegarLoop]: 10 mSDtfsCounter, 15 mSDsluCounter, 10 mSDsCounter, 0 mSdLazyCounter, 19 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 15 SdHoareTripleChecker+Valid, 19 SdHoareTripleChecker+Invalid, 21 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 19 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 00:13:20,666 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [15 Valid, 19 Invalid, 21 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 19 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 00:13:20,684 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2021-11-21 00:13:20,695 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 21. [2021-11-21 00:13:20,697 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21 states, 15 states have (on average 1.7333333333333334) internal successors, (26), 20 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) [2021-11-21 00:13:20,699 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 26 transitions. [2021-11-21 00:13:20,700 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 26 transitions. Word has length 3 [2021-11-21 00:13:20,700 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:13:20,700 INFO L470 AbstractCegarLoop]: Abstraction has 21 states and 26 transitions. [2021-11-21 00:13:20,701 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 1.0) internal successors, (3), 2 states have internal predecessors, (3), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:13:20,701 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 26 transitions. [2021-11-21 00:13:20,701 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2021-11-21 00:13:20,702 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:13:20,702 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1] [2021-11-21 00:13:20,703 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-21 00:13:20,704 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 2 more)] === [2021-11-21 00:13:20,709 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:13:20,709 INFO L85 PathProgramCache]: Analyzing trace with hash 86812, now seen corresponding path program 1 times [2021-11-21 00:13:20,709 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:13:20,710 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [846357218] [2021-11-21 00:13:20,711 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:13:20,711 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:13:20,730 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:13:20,754 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:13:20,755 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:13:20,755 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [846357218] [2021-11-21 00:13:20,756 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [846357218] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:13:20,756 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 00:13:20,757 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2021-11-21 00:13:20,757 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1813180136] [2021-11-21 00:13:20,757 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:13:20,758 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-21 00:13:20,758 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:13:20,759 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-21 00:13:20,759 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-21 00:13:20,760 INFO L87 Difference]: Start difference. First operand 21 states and 26 transitions. Second operand has 3 states, 2 states have (on average 1.5) internal successors, (3), 2 states have internal predecessors, (3), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:13:20,781 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:13:20,781 INFO L93 Difference]: Finished difference Result 19 states and 23 transitions. [2021-11-21 00:13:20,782 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-21 00:13:20,782 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 1.5) internal successors, (3), 2 states have internal predecessors, (3), 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 3 [2021-11-21 00:13:20,782 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:13:20,783 INFO L225 Difference]: With dead ends: 19 [2021-11-21 00:13:20,783 INFO L226 Difference]: Without dead ends: 19 [2021-11-21 00:13:20,783 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-21 00:13:20,785 INFO L933 BasicCegarLoop]: 9 mSDtfsCounter, 13 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 10 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 13 SdHoareTripleChecker+Valid, 9 SdHoareTripleChecker+Invalid, 11 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 10 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-21 00:13:20,786 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [13 Valid, 9 Invalid, 11 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 10 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-21 00:13:20,787 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2021-11-21 00:13:20,789 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2021-11-21 00:13:20,789 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19 states, 15 states have (on average 1.5333333333333334) internal successors, (23), 18 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:13:20,794 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 23 transitions. [2021-11-21 00:13:20,795 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 23 transitions. Word has length 3 [2021-11-21 00:13:20,795 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:13:20,796 INFO L470 AbstractCegarLoop]: Abstraction has 19 states and 23 transitions. [2021-11-21 00:13:20,797 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 1.5) internal successors, (3), 2 states have internal predecessors, (3), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:13:20,797 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 23 transitions. [2021-11-21 00:13:20,798 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2021-11-21 00:13:20,798 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:13:20,798 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1] [2021-11-21 00:13:20,798 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-11-21 00:13:20,799 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 2 more)] === [2021-11-21 00:13:20,799 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:13:20,799 INFO L85 PathProgramCache]: Analyzing trace with hash 86813, now seen corresponding path program 1 times [2021-11-21 00:13:20,799 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:13:20,800 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [411109678] [2021-11-21 00:13:20,800 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:13:20,800 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:13:20,827 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:13:20,881 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:13:20,881 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:13:20,882 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [411109678] [2021-11-21 00:13:20,882 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [411109678] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:13:20,882 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 00:13:20,882 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2021-11-21 00:13:20,883 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1663599999] [2021-11-21 00:13:20,883 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:13:20,883 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-21 00:13:20,883 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:13:20,884 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-21 00:13:20,884 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-21 00:13:20,885 INFO L87 Difference]: Start difference. First operand 19 states and 23 transitions. Second operand has 3 states, 2 states have (on average 1.5) internal successors, (3), 2 states have internal predecessors, (3), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:13:20,908 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:13:20,908 INFO L93 Difference]: Finished difference Result 20 states and 24 transitions. [2021-11-21 00:13:20,909 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-21 00:13:20,909 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 1.5) internal successors, (3), 2 states have internal predecessors, (3), 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 3 [2021-11-21 00:13:20,909 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:13:20,910 INFO L225 Difference]: With dead ends: 20 [2021-11-21 00:13:20,910 INFO L226 Difference]: Without dead ends: 20 [2021-11-21 00:13:20,910 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-21 00:13:20,912 INFO L933 BasicCegarLoop]: 12 mSDtfsCounter, 0 mSDsluCounter, 6 mSDsCounter, 0 mSdLazyCounter, 15 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 18 SdHoareTripleChecker+Invalid, 15 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 15 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-21 00:13:20,913 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 18 Invalid, 15 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 15 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-21 00:13:20,914 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2021-11-21 00:13:20,916 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2021-11-21 00:13:20,917 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20 states, 16 states have (on average 1.5) internal successors, (24), 19 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) [2021-11-21 00:13:20,917 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 24 transitions. [2021-11-21 00:13:20,918 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 24 transitions. Word has length 3 [2021-11-21 00:13:20,918 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:13:20,918 INFO L470 AbstractCegarLoop]: Abstraction has 20 states and 24 transitions. [2021-11-21 00:13:20,918 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 1.5) internal successors, (3), 2 states have internal predecessors, (3), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:13:20,919 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 24 transitions. [2021-11-21 00:13:20,919 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2021-11-21 00:13:20,919 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:13:20,919 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1] [2021-11-21 00:13:20,920 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-11-21 00:13:20,920 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 2 more)] === [2021-11-21 00:13:20,921 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:13:20,921 INFO L85 PathProgramCache]: Analyzing trace with hash 83474470, now seen corresponding path program 1 times [2021-11-21 00:13:20,921 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:13:20,921 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1203431278] [2021-11-21 00:13:20,922 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:13:20,922 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:13:20,935 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:13:20,966 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:13:20,967 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:13:20,967 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1203431278] [2021-11-21 00:13:20,968 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1203431278] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:13:20,968 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1215711827] [2021-11-21 00:13:20,968 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:13:20,968 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:13:20,969 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_05bfa4f4-06e3-4fa5-985d-771be0ff54c3/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:13:20,978 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_05bfa4f4-06e3-4fa5-985d-771be0ff54c3/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:13:20,979 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_05bfa4f4-06e3-4fa5-985d-771be0ff54c3/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-21 00:13:21,021 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:13:21,023 INFO L263 TraceCheckSpWp]: Trace formula consists of 46 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-21 00:13:21,027 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:13:21,111 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:13:21,111 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:13:21,137 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:13:21,138 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1215711827] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:13:21,138 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [592103755] [2021-11-21 00:13:21,156 INFO L159 IcfgInterpreter]: Started Sifa with 5 locations of interest [2021-11-21 00:13:21,157 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:13:21,161 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:13:21,166 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:13:21,167 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:13:21,244 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:13:21,246 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:13:21,254 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 22 [2021-11-21 00:13:21,482 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:13:21,484 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 34 treesize of output 36 [2021-11-21 00:13:21,770 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:13:21,772 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 00:13:21,800 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-21 00:13:21,801 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 190 treesize of output 189 [2021-11-21 00:13:22,486 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 21 [2021-11-21 00:13:22,626 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 21 [2021-11-21 00:13:22,836 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:13:23,086 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSifa [592103755] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:13:23,087 INFO L186 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:13:23,087 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [3, 3, 3] total 9 [2021-11-21 00:13:23,088 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1397162452] [2021-11-21 00:13:23,088 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:13:23,089 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-21 00:13:23,089 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:13:23,090 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-21 00:13:23,090 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=58, Unknown=0, NotChecked=0, Total=90 [2021-11-21 00:13:23,091 INFO L87 Difference]: Start difference. First operand 20 states and 24 transitions. Second operand has 5 states, 4 states have (on average 1.25) internal successors, (5), 4 states have internal predecessors, (5), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:13:23,299 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:13:23,299 INFO L93 Difference]: Finished difference Result 20 states and 23 transitions. [2021-11-21 00:13:23,300 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-21 00:13:23,300 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 1.25) internal successors, (5), 4 states have internal predecessors, (5), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 5 [2021-11-21 00:13:23,300 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:13:23,301 INFO L225 Difference]: With dead ends: 20 [2021-11-21 00:13:23,301 INFO L226 Difference]: Without dead ends: 20 [2021-11-21 00:13:23,302 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 27 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=36, Invalid=74, Unknown=0, NotChecked=0, Total=110 [2021-11-21 00:13:23,303 INFO L933 BasicCegarLoop]: 10 mSDtfsCounter, 3 mSDsluCounter, 16 mSDsCounter, 0 mSdLazyCounter, 21 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 26 SdHoareTripleChecker+Invalid, 32 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 21 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 11 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-21 00:13:23,304 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3 Valid, 26 Invalid, 32 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 21 Invalid, 0 Unknown, 11 Unchecked, 0.0s Time] [2021-11-21 00:13:23,305 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2021-11-21 00:13:23,306 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2021-11-21 00:13:23,307 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20 states, 16 states have (on average 1.4375) internal successors, (23), 19 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:13:23,307 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 23 transitions. [2021-11-21 00:13:23,311 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 23 transitions. Word has length 5 [2021-11-21 00:13:23,312 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:13:23,313 INFO L470 AbstractCegarLoop]: Abstraction has 20 states and 23 transitions. [2021-11-21 00:13:23,314 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 1.25) internal successors, (5), 4 states have internal predecessors, (5), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:13:23,315 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 23 transitions. [2021-11-21 00:13:23,316 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2021-11-21 00:13:23,316 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:13:23,316 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1] [2021-11-21 00:13:23,355 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_05bfa4f4-06e3-4fa5-985d-771be0ff54c3/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-21 00:13:23,517 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_05bfa4f4-06e3-4fa5-985d-771be0ff54c3/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:13:23,517 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 2 more)] === [2021-11-21 00:13:23,518 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:13:23,518 INFO L85 PathProgramCache]: Analyzing trace with hash 83472783, now seen corresponding path program 1 times [2021-11-21 00:13:23,518 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:13:23,519 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [4871088] [2021-11-21 00:13:23,519 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:13:23,519 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:13:23,536 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:13:23,600 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:13:23,600 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:13:23,601 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [4871088] [2021-11-21 00:13:23,601 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [4871088] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:13:23,601 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1738500777] [2021-11-21 00:13:23,601 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:13:23,601 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:13:23,602 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_05bfa4f4-06e3-4fa5-985d-771be0ff54c3/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:13:23,603 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_05bfa4f4-06e3-4fa5-985d-771be0ff54c3/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:13:23,623 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_05bfa4f4-06e3-4fa5-985d-771be0ff54c3/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-21 00:13:23,640 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:13:23,641 INFO L263 TraceCheckSpWp]: Trace formula consists of 46 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-21 00:13:23,642 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:13:23,655 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 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 6 treesize of output 5 [2021-11-21 00:13:23,705 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:13:23,705 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:13:23,753 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:13:23,753 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1738500777] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:13:23,754 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1751264901] [2021-11-21 00:13:23,756 INFO L159 IcfgInterpreter]: Started Sifa with 4 locations of interest [2021-11-21 00:13:23,756 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:13:23,756 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:13:23,757 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:13:23,757 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:13:23,775 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:13:23,776 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:13:23,777 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 22 [2021-11-21 00:13:23,944 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:13:23,946 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 34 treesize of output 36 [2021-11-21 00:13:24,117 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:13:24,118 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 00:13:24,149 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-21 00:13:24,150 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 190 treesize of output 189 [2021-11-21 00:13:24,746 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 21 [2021-11-21 00:13:24,844 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 21 [2021-11-21 00:13:24,909 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:13:25,144 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:13:25,144 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:13:25,144 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 2, 2] total 6 [2021-11-21 00:13:25,144 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [668527531] [2021-11-21 00:13:25,145 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 00:13:25,145 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-21 00:13:25,145 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:13:25,146 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-21 00:13:25,146 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=82, Unknown=0, NotChecked=0, Total=110 [2021-11-21 00:13:25,146 INFO L87 Difference]: Start difference. First operand 20 states and 23 transitions. Second operand has 8 states, 7 states have (on average 1.8571428571428572) internal successors, (13), 7 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:13:25,272 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:13:25,273 INFO L93 Difference]: Finished difference Result 46 states and 50 transitions. [2021-11-21 00:13:25,273 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-21 00:13:25,273 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 1.8571428571428572) internal successors, (13), 7 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 5 [2021-11-21 00:13:25,273 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:13:25,275 INFO L225 Difference]: With dead ends: 46 [2021-11-21 00:13:25,275 INFO L226 Difference]: Without dead ends: 46 [2021-11-21 00:13:25,276 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 7 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=35, Invalid=97, Unknown=0, NotChecked=0, Total=132 [2021-11-21 00:13:25,277 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 83 mSDsluCounter, 23 mSDsCounter, 0 mSdLazyCounter, 50 mSolverCounterSat, 32 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 83 SdHoareTripleChecker+Valid, 34 SdHoareTripleChecker+Invalid, 82 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 32 IncrementalHoareTripleChecker+Valid, 50 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 00:13:25,278 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [83 Valid, 34 Invalid, 82 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [32 Valid, 50 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 00:13:25,278 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2021-11-21 00:13:25,288 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 31. [2021-11-21 00:13:25,288 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 31 states, 28 states have (on average 1.25) internal successors, (35), 30 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:13:25,289 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 35 transitions. [2021-11-21 00:13:25,289 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 35 transitions. Word has length 5 [2021-11-21 00:13:25,289 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:13:25,289 INFO L470 AbstractCegarLoop]: Abstraction has 31 states and 35 transitions. [2021-11-21 00:13:25,290 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 1.8571428571428572) internal successors, (13), 7 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:13:25,290 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 35 transitions. [2021-11-21 00:13:25,290 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-11-21 00:13:25,290 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:13:25,291 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:13:25,336 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_05bfa4f4-06e3-4fa5-985d-771be0ff54c3/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-21 00:13:25,520 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_05bfa4f4-06e3-4fa5-985d-771be0ff54c3/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:13:25,520 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr4ASSERT_VIOLATIONMEMORY_LEAK === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 2 more)] === [2021-11-21 00:13:25,521 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:13:25,521 INFO L85 PathProgramCache]: Analyzing trace with hash -1320329847, now seen corresponding path program 1 times [2021-11-21 00:13:25,521 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:13:25,521 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1949982146] [2021-11-21 00:13:25,521 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:13:25,521 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:13:25,539 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:13:25,577 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2021-11-21 00:13:25,578 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:13:25,578 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1949982146] [2021-11-21 00:13:25,578 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1949982146] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:13:25,578 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 00:13:25,578 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-21 00:13:25,579 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1463137279] [2021-11-21 00:13:25,579 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:13:25,579 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-21 00:13:25,579 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:13:25,580 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-21 00:13:25,580 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-21 00:13:25,580 INFO L87 Difference]: Start difference. First operand 31 states and 35 transitions. Second operand has 4 states, 4 states have (on average 2.25) internal successors, (9), 4 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) [2021-11-21 00:13:25,606 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:13:25,607 INFO L93 Difference]: Finished difference Result 29 states and 33 transitions. [2021-11-21 00:13:25,607 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-21 00:13:25,607 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.25) internal successors, (9), 4 states have internal predecessors, (9), 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 15 [2021-11-21 00:13:25,608 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:13:25,608 INFO L225 Difference]: With dead ends: 29 [2021-11-21 00:13:25,608 INFO L226 Difference]: Without dead ends: 29 [2021-11-21 00:13:25,608 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-21 00:13:25,610 INFO L933 BasicCegarLoop]: 4 mSDtfsCounter, 10 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 17 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 6 SdHoareTripleChecker+Invalid, 20 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 17 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-21 00:13:25,610 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [10 Valid, 6 Invalid, 20 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 17 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-21 00:13:25,611 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2021-11-21 00:13:25,613 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2021-11-21 00:13:25,614 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29 states, 27 states have (on average 1.2222222222222223) internal successors, (33), 28 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:13:25,614 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 33 transitions. [2021-11-21 00:13:25,615 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 33 transitions. Word has length 15 [2021-11-21 00:13:25,615 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:13:25,615 INFO L470 AbstractCegarLoop]: Abstraction has 29 states and 33 transitions. [2021-11-21 00:13:25,615 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 2.25) internal successors, (9), 4 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:13:25,615 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 33 transitions. [2021-11-21 00:13:25,616 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2021-11-21 00:13:25,616 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:13:25,616 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:13:25,616 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2021-11-21 00:13:25,616 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr5ASSERT_VIOLATIONMEMORY_LEAK === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 2 more)] === [2021-11-21 00:13:25,617 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:13:25,617 INFO L85 PathProgramCache]: Analyzing trace with hash 2019452749, now seen corresponding path program 1 times [2021-11-21 00:13:25,617 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:13:25,617 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1046427759] [2021-11-21 00:13:25,617 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:13:25,618 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:13:25,658 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:13:25,721 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:13:25,722 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:13:25,722 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1046427759] [2021-11-21 00:13:25,722 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1046427759] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:13:25,722 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2087194015] [2021-11-21 00:13:25,722 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:13:25,723 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:13:25,723 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_05bfa4f4-06e3-4fa5-985d-771be0ff54c3/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:13:25,724 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_05bfa4f4-06e3-4fa5-985d-771be0ff54c3/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:13:25,743 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_05bfa4f4-06e3-4fa5-985d-771be0ff54c3/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-21 00:13:25,765 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:13:25,766 INFO L263 TraceCheckSpWp]: Trace formula consists of 90 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-21 00:13:25,767 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:13:25,809 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:13:25,809 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:13:25,883 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:13:25,883 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2087194015] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:13:25,883 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2143862571] [2021-11-21 00:13:25,885 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-21 00:13:25,886 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:13:25,886 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:13:25,886 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:13:25,886 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:13:25,918 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:13:25,918 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:13:25,920 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 22 [2021-11-21 00:13:26,023 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:13:26,025 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 34 treesize of output 36 [2021-11-21 00:13:26,196 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:13:26,197 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 00:13:26,220 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-21 00:13:26,221 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 190 treesize of output 189 [2021-11-21 00:13:26,776 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 21 [2021-11-21 00:13:26,881 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 21 [2021-11-21 00:13:27,272 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 80 treesize of output 77 [2021-11-21 00:13:27,489 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:13:27,970 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:13:27,970 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:13:27,970 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 12 [2021-11-21 00:13:27,971 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2020523221] [2021-11-21 00:13:27,971 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 00:13:27,971 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2021-11-21 00:13:27,971 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:13:27,972 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-11-21 00:13:27,972 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=165, Invalid=255, Unknown=0, NotChecked=0, Total=420 [2021-11-21 00:13:27,972 INFO L87 Difference]: Start difference. First operand 29 states and 33 transitions. Second operand has 13 states, 13 states have (on average 2.230769230769231) internal successors, (29), 12 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:13:28,105 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:13:28,105 INFO L93 Difference]: Finished difference Result 117 states and 118 transitions. [2021-11-21 00:13:28,106 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-21 00:13:28,106 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 2.230769230769231) internal successors, (29), 12 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 16 [2021-11-21 00:13:28,106 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:13:28,108 INFO L225 Difference]: With dead ends: 117 [2021-11-21 00:13:28,108 INFO L226 Difference]: Without dead ends: 117 [2021-11-21 00:13:28,109 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 33 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 171 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=165, Invalid=255, Unknown=0, NotChecked=0, Total=420 [2021-11-21 00:13:28,110 INFO L933 BasicCegarLoop]: 5 mSDtfsCounter, 160 mSDsluCounter, 50 mSDsCounter, 0 mSdLazyCounter, 66 mSolverCounterSat, 28 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 160 SdHoareTripleChecker+Valid, 55 SdHoareTripleChecker+Invalid, 94 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 28 IncrementalHoareTripleChecker+Valid, 66 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 00:13:28,110 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [160 Valid, 55 Invalid, 94 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [28 Valid, 66 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 00:13:28,111 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 117 states. [2021-11-21 00:13:28,116 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 117 to 41. [2021-11-21 00:13:28,117 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 41 states, 39 states have (on average 1.1538461538461537) internal successors, (45), 40 states have internal predecessors, (45), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:13:28,118 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 45 transitions. [2021-11-21 00:13:28,118 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 45 transitions. Word has length 16 [2021-11-21 00:13:28,118 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:13:28,118 INFO L470 AbstractCegarLoop]: Abstraction has 41 states and 45 transitions. [2021-11-21 00:13:28,119 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 2.230769230769231) internal successors, (29), 12 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:13:28,119 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 45 transitions. [2021-11-21 00:13:28,120 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-11-21 00:13:28,120 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:13:28,120 INFO L514 BasicCegarLoop]: trace histogram [10, 10, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 00:13:28,157 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_05bfa4f4-06e3-4fa5-985d-771be0ff54c3/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Ended with exit code 0 [2021-11-21 00:13:28,333 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_05bfa4f4-06e3-4fa5-985d-771be0ff54c3/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:13:28,334 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr5ASSERT_VIOLATIONMEMORY_LEAK === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 2 more)] === [2021-11-21 00:13:28,334 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:13:28,334 INFO L85 PathProgramCache]: Analyzing trace with hash 264809377, now seen corresponding path program 2 times [2021-11-21 00:13:28,334 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:13:28,334 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [543669337] [2021-11-21 00:13:28,334 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:13:28,335 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:13:28,367 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:13:28,473 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 00:13:28,473 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:13:28,473 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [543669337] [2021-11-21 00:13:28,474 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [543669337] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:13:28,474 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1395595844] [2021-11-21 00:13:28,474 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 00:13:28,474 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:13:28,475 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_05bfa4f4-06e3-4fa5-985d-771be0ff54c3/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:13:28,475 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_05bfa4f4-06e3-4fa5-985d-771be0ff54c3/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:13:28,499 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_05bfa4f4-06e3-4fa5-985d-771be0ff54c3/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-21 00:13:28,519 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 1 check-sat command(s) [2021-11-21 00:13:28,519 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 00:13:28,520 INFO L263 TraceCheckSpWp]: Trace formula consists of 50 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-21 00:13:28,522 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:13:28,694 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2021-11-21 00:13:28,695 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-21 00:13:28,695 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1395595844] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 00:13:28,695 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-21 00:13:28,695 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [12] total 14 [2021-11-21 00:13:28,696 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [640233929] [2021-11-21 00:13:28,696 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 00:13:28,696 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-21 00:13:28,696 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:13:28,697 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-21 00:13:28,697 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=82, Invalid=128, Unknown=0, NotChecked=0, Total=210 [2021-11-21 00:13:28,697 INFO L87 Difference]: Start difference. First operand 41 states and 45 transitions. Second operand has 4 states, 3 states have (on average 3.3333333333333335) internal successors, (10), 3 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) [2021-11-21 00:13:28,708 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:13:28,708 INFO L93 Difference]: Finished difference Result 40 states and 44 transitions. [2021-11-21 00:13:28,708 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-21 00:13:28,709 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 3.3333333333333335) internal successors, (10), 3 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 28 [2021-11-21 00:13:28,709 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:13:28,709 INFO L225 Difference]: With dead ends: 40 [2021-11-21 00:13:28,710 INFO L226 Difference]: Without dead ends: 36 [2021-11-21 00:13:28,710 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 26 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=82, Invalid=128, Unknown=0, NotChecked=0, Total=210 [2021-11-21 00:13:28,711 INFO L933 BasicCegarLoop]: 5 mSDtfsCounter, 3 mSDsluCounter, 7 mSDsCounter, 0 mSdLazyCounter, 8 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 10 SdHoareTripleChecker+Invalid, 14 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 8 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 6 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-21 00:13:28,711 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3 Valid, 10 Invalid, 14 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 8 Invalid, 0 Unknown, 6 Unchecked, 0.0s Time] [2021-11-21 00:13:28,712 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2021-11-21 00:13:28,714 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2021-11-21 00:13:28,715 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 36 states, 35 states have (on average 1.0571428571428572) internal successors, (37), 35 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:13:28,715 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 37 transitions. [2021-11-21 00:13:28,716 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 37 transitions. Word has length 28 [2021-11-21 00:13:28,716 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:13:28,716 INFO L470 AbstractCegarLoop]: Abstraction has 36 states and 37 transitions. [2021-11-21 00:13:28,716 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 3.3333333333333335) internal successors, (10), 3 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) [2021-11-21 00:13:28,717 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 37 transitions. [2021-11-21 00:13:28,717 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2021-11-21 00:13:28,718 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:13:28,718 INFO L514 BasicCegarLoop]: trace histogram [10, 10, 4, 4, 4, 1, 1, 1] [2021-11-21 00:13:28,753 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_05bfa4f4-06e3-4fa5-985d-771be0ff54c3/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Ended with exit code 0 [2021-11-21 00:13:28,935 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_05bfa4f4-06e3-4fa5-985d-771be0ff54c3/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:13:28,935 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 2 more)] === [2021-11-21 00:13:28,935 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:13:28,935 INFO L85 PathProgramCache]: Analyzing trace with hash 150833704, now seen corresponding path program 1 times [2021-11-21 00:13:28,936 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:13:28,936 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1871890794] [2021-11-21 00:13:28,936 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:13:28,936 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:13:28,961 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:13:29,064 INFO L134 CoverageAnalysis]: Checked inductivity of 122 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2021-11-21 00:13:29,064 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:13:29,065 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1871890794] [2021-11-21 00:13:29,065 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1871890794] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:13:29,065 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2003035014] [2021-11-21 00:13:29,065 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:13:29,065 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:13:29,066 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_05bfa4f4-06e3-4fa5-985d-771be0ff54c3/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:13:29,072 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_05bfa4f4-06e3-4fa5-985d-771be0ff54c3/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:13:29,091 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_05bfa4f4-06e3-4fa5-985d-771be0ff54c3/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-21 00:13:29,128 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:13:29,129 INFO L263 TraceCheckSpWp]: Trace formula consists of 176 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-21 00:13:29,131 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:13:29,205 INFO L134 CoverageAnalysis]: Checked inductivity of 122 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2021-11-21 00:13:29,205 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:13:29,436 INFO L134 CoverageAnalysis]: Checked inductivity of 122 backedges. 0 proven. 100 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2021-11-21 00:13:29,436 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2003035014] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:13:29,436 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2020626990] [2021-11-21 00:13:29,438 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-21 00:13:29,438 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:13:29,439 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:13:29,439 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:13:29,439 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:13:29,471 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:13:29,472 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:13:29,475 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 22 [2021-11-21 00:13:29,575 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:13:29,577 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 34 treesize of output 36 [2021-11-21 00:13:29,761 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:13:29,762 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 00:13:29,785 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-21 00:13:29,785 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 190 treesize of output 189 [2021-11-21 00:13:30,295 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 21 [2021-11-21 00:13:30,406 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 21 [2021-11-21 00:13:31,150 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:13:31,461 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:13:31,461 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:13:31,461 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12] total 24 [2021-11-21 00:13:31,461 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1233334044] [2021-11-21 00:13:31,461 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 00:13:31,462 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2021-11-21 00:13:31,462 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:13:31,462 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-11-21 00:13:31,463 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=317, Invalid=613, Unknown=0, NotChecked=0, Total=930 [2021-11-21 00:13:31,463 INFO L87 Difference]: Start difference. First operand 36 states and 37 transitions. Second operand has 25 states, 25 states have (on average 2.04) internal successors, (51), 24 states have internal predecessors, (51), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:13:31,722 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:13:31,722 INFO L93 Difference]: Finished difference Result 134 states and 135 transitions. [2021-11-21 00:13:31,722 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-11-21 00:13:31,723 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 2.04) internal successors, (51), 24 states have internal predecessors, (51), 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 35 [2021-11-21 00:13:31,723 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:13:31,724 INFO L225 Difference]: With dead ends: 134 [2021-11-21 00:13:31,724 INFO L226 Difference]: Without dead ends: 134 [2021-11-21 00:13:31,725 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 115 GetRequests, 86 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 240 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=317, Invalid=613, Unknown=0, NotChecked=0, Total=930 [2021-11-21 00:13:31,726 INFO L933 BasicCegarLoop]: 1 mSDtfsCounter, 226 mSDsluCounter, 23 mSDsCounter, 0 mSdLazyCounter, 119 mSolverCounterSat, 91 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 226 SdHoareTripleChecker+Valid, 24 SdHoareTripleChecker+Invalid, 210 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 91 IncrementalHoareTripleChecker+Valid, 119 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-21 00:13:31,726 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [226 Valid, 24 Invalid, 210 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [91 Valid, 119 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-21 00:13:31,727 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 134 states. [2021-11-21 00:13:31,731 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 134 to 60. [2021-11-21 00:13:31,732 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 60 states, 59 states have (on average 1.0338983050847457) internal successors, (61), 59 states have internal predecessors, (61), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:13:31,733 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 61 transitions. [2021-11-21 00:13:31,733 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 61 transitions. Word has length 35 [2021-11-21 00:13:31,733 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:13:31,733 INFO L470 AbstractCegarLoop]: Abstraction has 60 states and 61 transitions. [2021-11-21 00:13:31,734 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 25 states have (on average 2.04) internal successors, (51), 24 states have internal predecessors, (51), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:13:31,734 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 61 transitions. [2021-11-21 00:13:31,736 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2021-11-21 00:13:31,736 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:13:31,736 INFO L514 BasicCegarLoop]: trace histogram [22, 22, 4, 4, 4, 1, 1, 1] [2021-11-21 00:13:31,775 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_05bfa4f4-06e3-4fa5-985d-771be0ff54c3/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-21 00:13:31,964 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_05bfa4f4-06e3-4fa5-985d-771be0ff54c3/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable8 [2021-11-21 00:13:31,964 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 2 more)] === [2021-11-21 00:13:31,964 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:13:31,965 INFO L85 PathProgramCache]: Analyzing trace with hash 1333874304, now seen corresponding path program 2 times [2021-11-21 00:13:31,965 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:13:31,965 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1713349993] [2021-11-21 00:13:31,965 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:13:31,965 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:13:32,036 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:13:32,367 INFO L134 CoverageAnalysis]: Checked inductivity of 506 backedges. 0 proven. 484 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2021-11-21 00:13:32,367 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:13:32,368 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1713349993] [2021-11-21 00:13:32,368 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1713349993] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:13:32,368 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [210275002] [2021-11-21 00:13:32,368 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 00:13:32,368 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:13:32,369 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_05bfa4f4-06e3-4fa5-985d-771be0ff54c3/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:13:32,370 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_05bfa4f4-06e3-4fa5-985d-771be0ff54c3/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:13:32,371 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_05bfa4f4-06e3-4fa5-985d-771be0ff54c3/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-21 00:13:32,438 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2021-11-21 00:13:32,438 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 00:13:32,439 INFO L263 TraceCheckSpWp]: Trace formula consists of 116 conjuncts, 11 conjunts are in the unsatisfiable core [2021-11-21 00:13:32,441 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:13:32,711 INFO L134 CoverageAnalysis]: Checked inductivity of 506 backedges. 22 proven. 22 refuted. 0 times theorem prover too weak. 462 trivial. 0 not checked. [2021-11-21 00:13:32,711 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:13:33,158 INFO L134 CoverageAnalysis]: Checked inductivity of 506 backedges. 22 proven. 22 refuted. 0 times theorem prover too weak. 462 trivial. 0 not checked. [2021-11-21 00:13:33,159 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [210275002] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:13:33,159 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1005352832] [2021-11-21 00:13:33,162 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-21 00:13:33,162 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:13:33,162 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:13:33,163 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:13:33,163 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:13:33,177 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:13:33,178 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:13:33,179 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 22 [2021-11-21 00:13:33,322 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:13:33,323 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 39 treesize of output 41 [2021-11-21 00:13:33,482 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:13:33,484 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:13:33,506 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:13:33,519 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-21 00:13:33,520 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 200 treesize of output 188 [2021-11-21 00:13:33,854 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 21 [2021-11-21 00:13:33,933 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 21 [2021-11-21 00:13:34,640 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:13:34,996 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:13:34,996 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:13:34,996 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 8, 8] total 39 [2021-11-21 00:13:34,996 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1197025283] [2021-11-21 00:13:34,996 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 00:13:34,997 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 39 states [2021-11-21 00:13:34,997 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:13:34,998 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2021-11-21 00:13:34,999 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=563, Invalid=1417, Unknown=0, NotChecked=0, Total=1980 [2021-11-21 00:13:35,000 INFO L87 Difference]: Start difference. First operand 60 states and 61 transitions. Second operand has 39 states, 39 states have (on average 2.128205128205128) internal successors, (83), 39 states have internal predecessors, (83), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:13:36,313 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:13:36,313 INFO L93 Difference]: Finished difference Result 135 states and 136 transitions. [2021-11-21 00:13:36,313 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2021-11-21 00:13:36,313 INFO L78 Accepts]: Start accepts. Automaton has has 39 states, 39 states have (on average 2.128205128205128) internal successors, (83), 39 states have internal predecessors, (83), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 59 [2021-11-21 00:13:36,314 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:13:36,315 INFO L225 Difference]: With dead ends: 135 [2021-11-21 00:13:36,315 INFO L226 Difference]: Without dead ends: 135 [2021-11-21 00:13:36,318 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 257 GetRequests, 178 SyntacticMatches, 0 SemanticMatches, 79 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1903 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=1801, Invalid=4679, Unknown=0, NotChecked=0, Total=6480 [2021-11-21 00:13:36,319 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 331 mSDsluCounter, 31 mSDsCounter, 0 mSdLazyCounter, 162 mSolverCounterSat, 149 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 331 SdHoareTripleChecker+Valid, 33 SdHoareTripleChecker+Invalid, 311 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 149 IncrementalHoareTripleChecker+Valid, 162 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-21 00:13:36,319 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [331 Valid, 33 Invalid, 311 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [149 Valid, 162 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-21 00:13:36,320 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 135 states. [2021-11-21 00:13:36,325 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 135 to 80. [2021-11-21 00:13:36,325 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 80 states, 79 states have (on average 1.0253164556962024) internal successors, (81), 79 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) [2021-11-21 00:13:36,326 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 81 transitions. [2021-11-21 00:13:36,326 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 81 transitions. Word has length 59 [2021-11-21 00:13:36,327 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:13:36,327 INFO L470 AbstractCegarLoop]: Abstraction has 80 states and 81 transitions. [2021-11-21 00:13:36,327 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 39 states, 39 states have (on average 2.128205128205128) internal successors, (83), 39 states have internal predecessors, (83), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:13:36,327 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 81 transitions. [2021-11-21 00:13:36,329 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 80 [2021-11-21 00:13:36,329 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:13:36,329 INFO L514 BasicCegarLoop]: trace histogram [23, 23, 10, 10, 10, 1, 1, 1] [2021-11-21 00:13:36,366 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_05bfa4f4-06e3-4fa5-985d-771be0ff54c3/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-21 00:13:36,556 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_05bfa4f4-06e3-4fa5-985d-771be0ff54c3/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2021-11-21 00:13:36,556 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 2 more)] === [2021-11-21 00:13:36,557 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:13:36,557 INFO L85 PathProgramCache]: Analyzing trace with hash -916680654, now seen corresponding path program 3 times [2021-11-21 00:13:36,557 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:13:36,557 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1563826533] [2021-11-21 00:13:36,557 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:13:36,557 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:13:36,600 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:13:36,908 INFO L134 CoverageAnalysis]: Checked inductivity of 674 backedges. 0 proven. 529 refuted. 0 times theorem prover too weak. 145 trivial. 0 not checked. [2021-11-21 00:13:36,908 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:13:36,908 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1563826533] [2021-11-21 00:13:36,909 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1563826533] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:13:36,909 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1933809588] [2021-11-21 00:13:36,909 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-21 00:13:36,909 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:13:36,909 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_05bfa4f4-06e3-4fa5-985d-771be0ff54c3/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:13:36,910 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_05bfa4f4-06e3-4fa5-985d-771be0ff54c3/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:13:36,911 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_05bfa4f4-06e3-4fa5-985d-771be0ff54c3/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-21 00:13:37,300 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-21 00:13:37,300 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 00:13:37,303 INFO L263 TraceCheckSpWp]: Trace formula consists of 366 conjuncts, 25 conjunts are in the unsatisfiable core [2021-11-21 00:13:37,306 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:13:37,494 INFO L134 CoverageAnalysis]: Checked inductivity of 674 backedges. 0 proven. 529 refuted. 0 times theorem prover too weak. 145 trivial. 0 not checked. [2021-11-21 00:13:37,496 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:13:38,361 INFO L134 CoverageAnalysis]: Checked inductivity of 674 backedges. 0 proven. 529 refuted. 0 times theorem prover too weak. 145 trivial. 0 not checked. [2021-11-21 00:13:38,361 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1933809588] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:13:38,361 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [167653318] [2021-11-21 00:13:38,364 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-21 00:13:38,364 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:13:38,365 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:13:38,365 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:13:38,365 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:13:38,378 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:13:38,379 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:13:38,380 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 22 [2021-11-21 00:13:38,484 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:13:38,486 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 34 treesize of output 36 [2021-11-21 00:13:38,606 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:13:38,607 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 00:13:38,625 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-21 00:13:38,625 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 190 treesize of output 189 [2021-11-21 00:13:39,055 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 21 [2021-11-21 00:13:39,137 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 21 [2021-11-21 00:13:39,757 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:13:40,042 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:13:40,042 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:13:40,042 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 25] total 50 [2021-11-21 00:13:40,042 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [343787972] [2021-11-21 00:13:40,043 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 00:13:40,043 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 51 states [2021-11-21 00:13:40,043 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:13:40,045 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2021-11-21 00:13:40,046 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1292, Invalid=1900, Unknown=0, NotChecked=0, Total=3192 [2021-11-21 00:13:40,046 INFO L87 Difference]: Start difference. First operand 80 states and 81 transitions. Second operand has 51 states, 51 states have (on average 2.019607843137255) internal successors, (103), 50 states have internal predecessors, (103), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:13:40,494 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:13:40,494 INFO L93 Difference]: Finished difference Result 284 states and 285 transitions. [2021-11-21 00:13:40,494 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2021-11-21 00:13:40,495 INFO L78 Accepts]: Start accepts. Automaton has has 51 states, 51 states have (on average 2.019607843137255) internal successors, (103), 50 states have internal predecessors, (103), 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 79 [2021-11-21 00:13:40,495 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:13:40,496 INFO L225 Difference]: With dead ends: 284 [2021-11-21 00:13:40,496 INFO L226 Difference]: Without dead ends: 284 [2021-11-21 00:13:40,498 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 260 GetRequests, 205 SyntacticMatches, 0 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 526 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=1292, Invalid=1900, Unknown=0, NotChecked=0, Total=3192 [2021-11-21 00:13:40,499 INFO L933 BasicCegarLoop]: 1 mSDtfsCounter, 346 mSDsluCounter, 48 mSDsCounter, 0 mSdLazyCounter, 239 mSolverCounterSat, 139 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 346 SdHoareTripleChecker+Valid, 49 SdHoareTripleChecker+Invalid, 378 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 139 IncrementalHoareTripleChecker+Valid, 239 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-21 00:13:40,499 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [346 Valid, 49 Invalid, 378 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [139 Valid, 239 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-21 00:13:40,500 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 284 states. [2021-11-21 00:13:40,507 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 284 to 130. [2021-11-21 00:13:40,508 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 130 states, 129 states have (on average 1.0155038759689923) internal successors, (131), 129 states have internal predecessors, (131), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:13:40,510 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 130 states to 130 states and 131 transitions. [2021-11-21 00:13:40,510 INFO L78 Accepts]: Start accepts. Automaton has 130 states and 131 transitions. Word has length 79 [2021-11-21 00:13:40,510 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:13:40,510 INFO L470 AbstractCegarLoop]: Abstraction has 130 states and 131 transitions. [2021-11-21 00:13:40,511 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 51 states, 51 states have (on average 2.019607843137255) internal successors, (103), 50 states have internal predecessors, (103), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:13:40,511 INFO L276 IsEmpty]: Start isEmpty. Operand 130 states and 131 transitions. [2021-11-21 00:13:40,513 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 130 [2021-11-21 00:13:40,513 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:13:40,513 INFO L514 BasicCegarLoop]: trace histogram [48, 48, 10, 10, 10, 1, 1, 1] [2021-11-21 00:13:40,544 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_05bfa4f4-06e3-4fa5-985d-771be0ff54c3/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-11-21 00:13:40,727 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_05bfa4f4-06e3-4fa5-985d-771be0ff54c3/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:13:40,727 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 2 more)] === [2021-11-21 00:13:40,727 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:13:40,727 INFO L85 PathProgramCache]: Analyzing trace with hash -708013996, now seen corresponding path program 4 times [2021-11-21 00:13:40,728 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:13:40,728 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [885435804] [2021-11-21 00:13:40,728 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:13:40,728 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:13:40,846 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:13:42,010 INFO L134 CoverageAnalysis]: Checked inductivity of 2449 backedges. 0 proven. 2304 refuted. 0 times theorem prover too weak. 145 trivial. 0 not checked. [2021-11-21 00:13:42,010 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:13:42,010 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [885435804] [2021-11-21 00:13:42,010 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [885435804] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:13:42,010 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1249869883] [2021-11-21 00:13:42,010 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-21 00:13:42,010 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:13:42,011 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_05bfa4f4-06e3-4fa5-985d-771be0ff54c3/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:13:42,011 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_05bfa4f4-06e3-4fa5-985d-771be0ff54c3/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:13:42,012 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_05bfa4f4-06e3-4fa5-985d-771be0ff54c3/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-11-21 00:13:42,129 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:13:42,132 INFO L263 TraceCheckSpWp]: Trace formula consists of 616 conjuncts, 50 conjunts are in the unsatisfiable core [2021-11-21 00:13:42,138 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:13:42,426 INFO L134 CoverageAnalysis]: Checked inductivity of 2449 backedges. 0 proven. 2304 refuted. 0 times theorem prover too weak. 145 trivial. 0 not checked. [2021-11-21 00:13:42,426 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:13:45,155 INFO L134 CoverageAnalysis]: Checked inductivity of 2449 backedges. 0 proven. 2304 refuted. 0 times theorem prover too weak. 145 trivial. 0 not checked. [2021-11-21 00:13:45,155 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1249869883] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:13:45,155 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [232838892] [2021-11-21 00:13:45,157 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-21 00:13:45,158 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:13:45,158 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:13:45,158 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:13:45,158 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:13:45,200 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:13:45,201 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:13:45,202 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 22 [2021-11-21 00:13:45,325 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:13:45,326 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 39 treesize of output 41 [2021-11-21 00:13:45,464 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:13:45,466 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:13:45,468 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:13:45,478 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-21 00:13:45,479 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 200 treesize of output 188 [2021-11-21 00:13:45,735 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 21 [2021-11-21 00:13:45,875 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 21 [2021-11-21 00:13:46,570 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:13:46,990 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:13:46,990 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:13:46,991 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [50, 50, 50] total 100 [2021-11-21 00:13:46,991 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [34767574] [2021-11-21 00:13:46,991 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 00:13:46,992 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 101 states [2021-11-21 00:13:46,992 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:13:46,994 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 101 interpolants. [2021-11-21 00:13:46,997 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5065, Invalid=6065, Unknown=0, NotChecked=0, Total=11130 [2021-11-21 00:13:46,998 INFO L87 Difference]: Start difference. First operand 130 states and 131 transitions. Second operand has 101 states, 101 states have (on average 2.00990099009901) internal successors, (203), 100 states have internal predecessors, (203), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:13:48,730 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:13:48,730 INFO L93 Difference]: Finished difference Result 584 states and 585 transitions. [2021-11-21 00:13:48,730 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 100 states. [2021-11-21 00:13:48,731 INFO L78 Accepts]: Start accepts. Automaton has has 101 states, 101 states have (on average 2.00990099009901) internal successors, (203), 100 states have internal predecessors, (203), 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 129 [2021-11-21 00:13:48,731 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:13:48,735 INFO L225 Difference]: With dead ends: 584 [2021-11-21 00:13:48,735 INFO L226 Difference]: Without dead ends: 584 [2021-11-21 00:13:48,739 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 435 GetRequests, 331 SyntacticMatches, 0 SemanticMatches, 104 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 927 ImplicationChecksByTransitivity, 3.8s TimeCoverageRelationStatistics Valid=5065, Invalid=6065, Unknown=0, NotChecked=0, Total=11130 [2021-11-21 00:13:48,740 INFO L933 BasicCegarLoop]: 1 mSDtfsCounter, 1256 mSDsluCounter, 98 mSDsCounter, 0 mSdLazyCounter, 487 mSolverCounterSat, 438 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1256 SdHoareTripleChecker+Valid, 99 SdHoareTripleChecker+Invalid, 925 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 438 IncrementalHoareTripleChecker+Valid, 487 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-21 00:13:48,740 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1256 Valid, 99 Invalid, 925 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [438 Valid, 487 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2021-11-21 00:13:48,741 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 584 states. [2021-11-21 00:13:48,751 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 584 to 230. [2021-11-21 00:13:48,752 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 230 states, 229 states have (on average 1.0087336244541485) internal successors, (231), 229 states have internal predecessors, (231), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:13:48,754 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 230 states to 230 states and 231 transitions. [2021-11-21 00:13:48,754 INFO L78 Accepts]: Start accepts. Automaton has 230 states and 231 transitions. Word has length 129 [2021-11-21 00:13:48,755 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:13:48,755 INFO L470 AbstractCegarLoop]: Abstraction has 230 states and 231 transitions. [2021-11-21 00:13:48,755 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 101 states, 101 states have (on average 2.00990099009901) internal successors, (203), 100 states have internal predecessors, (203), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:13:48,756 INFO L276 IsEmpty]: Start isEmpty. Operand 230 states and 231 transitions. [2021-11-21 00:13:48,759 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 230 [2021-11-21 00:13:48,759 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:13:48,759 INFO L514 BasicCegarLoop]: trace histogram [98, 98, 10, 10, 10, 1, 1, 1] [2021-11-21 00:13:48,789 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_05bfa4f4-06e3-4fa5-985d-771be0ff54c3/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-11-21 00:13:48,984 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_05bfa4f4-06e3-4fa5-985d-771be0ff54c3/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:13:48,984 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 2 more)] === [2021-11-21 00:13:48,984 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:13:48,985 INFO L85 PathProgramCache]: Analyzing trace with hash -962163944, now seen corresponding path program 5 times [2021-11-21 00:13:48,985 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:13:48,985 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [478057904] [2021-11-21 00:13:48,985 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:13:48,985 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:13:49,125 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:13:52,705 INFO L134 CoverageAnalysis]: Checked inductivity of 9749 backedges. 0 proven. 9604 refuted. 0 times theorem prover too weak. 145 trivial. 0 not checked. [2021-11-21 00:13:52,706 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:13:52,706 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [478057904] [2021-11-21 00:13:52,706 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [478057904] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:13:52,706 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2103060482] [2021-11-21 00:13:52,706 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 00:13:52,706 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:13:52,706 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_05bfa4f4-06e3-4fa5-985d-771be0ff54c3/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:13:52,707 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_05bfa4f4-06e3-4fa5-985d-771be0ff54c3/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:13:52,719 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_05bfa4f4-06e3-4fa5-985d-771be0ff54c3/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-11-21 00:13:52,819 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 11 check-sat command(s) [2021-11-21 00:13:52,819 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 00:13:52,821 INFO L263 TraceCheckSpWp]: Trace formula consists of 236 conjuncts, 17 conjunts are in the unsatisfiable core [2021-11-21 00:13:52,828 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:13:53,452 INFO L134 CoverageAnalysis]: Checked inductivity of 9749 backedges. 98 proven. 145 refuted. 0 times theorem prover too weak. 9506 trivial. 0 not checked. [2021-11-21 00:13:53,453 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:13:54,837 INFO L134 CoverageAnalysis]: Checked inductivity of 9749 backedges. 98 proven. 145 refuted. 0 times theorem prover too weak. 9506 trivial. 0 not checked. [2021-11-21 00:13:54,837 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2103060482] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:13:54,838 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [851127947] [2021-11-21 00:13:54,840 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-21 00:13:54,840 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:13:54,840 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:13:54,840 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:13:54,841 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:13:54,858 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:13:54,859 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:13:54,860 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 22 [2021-11-21 00:13:54,987 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:13:54,988 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 39 treesize of output 41 [2021-11-21 00:13:55,114 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:13:55,115 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:13:55,117 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:13:55,127 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-21 00:13:55,127 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 200 treesize of output 188 [2021-11-21 00:13:55,372 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 21 [2021-11-21 00:13:55,450 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 21 [2021-11-21 00:13:56,261 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:13:56,950 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:13:56,950 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:13:56,950 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [100, 14, 14] total 127 [2021-11-21 00:13:56,950 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [449892959] [2021-11-21 00:13:56,951 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 00:13:56,951 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 127 states [2021-11-21 00:13:56,952 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:13:56,953 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 127 interpolants. [2021-11-21 00:13:56,958 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6596, Invalid=10696, Unknown=0, NotChecked=0, Total=17292 [2021-11-21 00:13:56,959 INFO L87 Difference]: Start difference. First operand 230 states and 231 transitions. Second operand has 127 states, 127 states have (on average 2.1338582677165356) internal successors, (271), 127 states have internal predecessors, (271), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:14:09,914 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:14:09,914 INFO L93 Difference]: Finished difference Result 579 states and 580 transitions. [2021-11-21 00:14:09,915 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 181 states. [2021-11-21 00:14:09,915 INFO L78 Accepts]: Start accepts. Automaton has has 127 states, 127 states have (on average 2.1338582677165356) internal successors, (271), 127 states have internal predecessors, (271), 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 229 [2021-11-21 00:14:09,916 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:14:09,919 INFO L225 Difference]: With dead ends: 579 [2021-11-21 00:14:09,919 INFO L226 Difference]: Without dead ends: 579 [2021-11-21 00:14:09,930 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1059 GetRequests, 753 SyntacticMatches, 0 SemanticMatches, 306 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 25827 ImplicationChecksByTransitivity, 15.7s TimeCoverageRelationStatistics Valid=29098, Invalid=65458, Unknown=0, NotChecked=0, Total=94556 [2021-11-21 00:14:09,931 INFO L933 BasicCegarLoop]: 2 mSDtfsCounter, 1746 mSDsluCounter, 115 mSDsCounter, 0 mSdLazyCounter, 559 mSolverCounterSat, 770 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1746 SdHoareTripleChecker+Valid, 117 SdHoareTripleChecker+Invalid, 1329 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 770 IncrementalHoareTripleChecker+Valid, 559 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2021-11-21 00:14:09,931 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1746 Valid, 117 Invalid, 1329 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [770 Valid, 559 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2021-11-21 00:14:09,932 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 579 states. [2021-11-21 00:14:09,943 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 579 to 268. [2021-11-21 00:14:09,943 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 268 states, 267 states have (on average 1.0074906367041199) internal successors, (269), 267 states have internal predecessors, (269), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:14:09,946 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 268 states to 268 states and 269 transitions. [2021-11-21 00:14:09,946 INFO L78 Accepts]: Start accepts. Automaton has 268 states and 269 transitions. Word has length 229 [2021-11-21 00:14:09,947 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:14:09,947 INFO L470 AbstractCegarLoop]: Abstraction has 268 states and 269 transitions. [2021-11-21 00:14:09,947 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 127 states, 127 states have (on average 2.1338582677165356) internal successors, (271), 127 states have internal predecessors, (271), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:14:09,948 INFO L276 IsEmpty]: Start isEmpty. Operand 268 states and 269 transitions. [2021-11-21 00:14:09,952 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 268 [2021-11-21 00:14:09,952 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:14:09,952 INFO L514 BasicCegarLoop]: trace histogram [99, 99, 22, 22, 22, 1, 1, 1] [2021-11-21 00:14:09,983 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_05bfa4f4-06e3-4fa5-985d-771be0ff54c3/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2021-11-21 00:14:10,176 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_05bfa4f4-06e3-4fa5-985d-771be0ff54c3/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2021-11-21 00:14:10,176 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 2 more)] === [2021-11-21 00:14:10,176 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:14:10,176 INFO L85 PathProgramCache]: Analyzing trace with hash -127671414, now seen corresponding path program 6 times [2021-11-21 00:14:10,177 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:14:10,177 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [71010756] [2021-11-21 00:14:10,177 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:14:10,177 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:14:10,303 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:14:13,842 INFO L134 CoverageAnalysis]: Checked inductivity of 10516 backedges. 0 proven. 9801 refuted. 0 times theorem prover too weak. 715 trivial. 0 not checked. [2021-11-21 00:14:13,842 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:14:13,843 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [71010756] [2021-11-21 00:14:13,843 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [71010756] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:14:13,843 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [161737286] [2021-11-21 00:14:13,843 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-21 00:14:13,843 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:14:13,843 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_05bfa4f4-06e3-4fa5-985d-771be0ff54c3/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:14:13,844 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_05bfa4f4-06e3-4fa5-985d-771be0ff54c3/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:14:13,845 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_05bfa4f4-06e3-4fa5-985d-771be0ff54c3/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-11-21 00:14:35,968 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-21 00:14:35,968 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 00:14:36,004 INFO L263 TraceCheckSpWp]: Trace formula consists of 1246 conjuncts, 101 conjunts are in the unsatisfiable core [2021-11-21 00:14:36,009 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:14:36,562 INFO L134 CoverageAnalysis]: Checked inductivity of 10516 backedges. 0 proven. 9801 refuted. 0 times theorem prover too weak. 715 trivial. 0 not checked. [2021-11-21 00:14:36,563 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:14:46,578 INFO L134 CoverageAnalysis]: Checked inductivity of 10516 backedges. 0 proven. 9801 refuted. 0 times theorem prover too weak. 715 trivial. 0 not checked. [2021-11-21 00:14:46,578 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [161737286] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:14:46,579 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [36638309] [2021-11-21 00:14:46,580 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-21 00:14:46,581 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:14:46,581 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:14:46,581 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:14:46,581 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:14:46,610 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:14:46,611 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:14:46,612 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 22 [2021-11-21 00:14:46,725 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:14:46,726 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 34 treesize of output 36 [2021-11-21 00:14:46,842 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:14:46,843 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 00:14:46,869 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-21 00:14:46,869 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 190 treesize of output 189 [2021-11-21 00:14:47,213 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 21 [2021-11-21 00:14:47,268 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 21 [2021-11-21 00:14:47,961 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:14:48,548 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:14:48,549 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:14:48,549 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [101, 101, 101] total 202 [2021-11-21 00:14:48,549 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1745295463] [2021-11-21 00:14:48,549 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 00:14:48,550 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 203 states [2021-11-21 00:14:48,551 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:14:48,556 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 203 interpolants. [2021-11-21 00:14:48,559 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=20518, Invalid=22538, Unknown=0, NotChecked=0, Total=43056 [2021-11-21 00:14:48,560 INFO L87 Difference]: Start difference. First operand 268 states and 269 transitions. Second operand has 203 states, 203 states have (on average 2.0049261083743843) internal successors, (407), 202 states have internal predecessors, (407), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:15:02,951 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:15:02,951 INFO L93 Difference]: Finished difference Result 1184 states and 1185 transitions. [2021-11-21 00:15:02,951 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 202 states. [2021-11-21 00:15:02,952 INFO L78 Accepts]: Start accepts. Automaton has has 203 states, 203 states have (on average 2.0049261083743843) internal successors, (407), 202 states have internal predecessors, (407), 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 267 [2021-11-21 00:15:02,952 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:15:02,959 INFO L225 Difference]: With dead ends: 1184 [2021-11-21 00:15:02,959 INFO L226 Difference]: Without dead ends: 1184 [2021-11-21 00:15:02,962 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 900 GetRequests, 694 SyntacticMatches, 0 SemanticMatches, 206 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1896 ImplicationChecksByTransitivity, 13.3s TimeCoverageRelationStatistics Valid=20518, Invalid=22538, Unknown=0, NotChecked=0, Total=43056 [2021-11-21 00:15:02,965 INFO L933 BasicCegarLoop]: 1 mSDtfsCounter, 2952 mSDsluCounter, 200 mSDsCounter, 0 mSdLazyCounter, 988 mSolverCounterSat, 1075 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2952 SdHoareTripleChecker+Valid, 201 SdHoareTripleChecker+Invalid, 2063 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1075 IncrementalHoareTripleChecker+Valid, 988 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.3s IncrementalHoareTripleChecker+Time [2021-11-21 00:15:02,966 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2952 Valid, 201 Invalid, 2063 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1075 Valid, 988 Invalid, 0 Unknown, 0 Unchecked, 1.3s Time] [2021-11-21 00:15:02,968 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1184 states. [2021-11-21 00:15:02,980 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1184 to 470. [2021-11-21 00:15:02,981 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 470 states, 469 states have (on average 1.004264392324094) internal successors, (471), 469 states have internal predecessors, (471), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:15:02,984 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 470 states to 470 states and 471 transitions. [2021-11-21 00:15:02,984 INFO L78 Accepts]: Start accepts. Automaton has 470 states and 471 transitions. Word has length 267 [2021-11-21 00:15:02,985 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:15:02,985 INFO L470 AbstractCegarLoop]: Abstraction has 470 states and 471 transitions. [2021-11-21 00:15:02,985 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 203 states, 203 states have (on average 2.0049261083743843) internal successors, (407), 202 states have internal predecessors, (407), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:15:02,986 INFO L276 IsEmpty]: Start isEmpty. Operand 470 states and 471 transitions. [2021-11-21 00:15:02,997 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 470 [2021-11-21 00:15:02,997 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:15:02,998 INFO L514 BasicCegarLoop]: trace histogram [200, 200, 22, 22, 22, 1, 1, 1] [2021-11-21 00:15:03,048 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_05bfa4f4-06e3-4fa5-985d-771be0ff54c3/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2021-11-21 00:15:03,224 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_05bfa4f4-06e3-4fa5-985d-771be0ff54c3/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2021-11-21 00:15:03,224 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 2 more)] === [2021-11-21 00:15:03,224 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:15:03,224 INFO L85 PathProgramCache]: Analyzing trace with hash 1229498244, now seen corresponding path program 7 times [2021-11-21 00:15:03,225 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:15:03,225 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1164192881] [2021-11-21 00:15:03,225 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:15:03,225 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:15:03,737 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:15:17,172 INFO L134 CoverageAnalysis]: Checked inductivity of 40715 backedges. 0 proven. 40000 refuted. 0 times theorem prover too weak. 715 trivial. 0 not checked. [2021-11-21 00:15:17,173 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:15:17,173 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1164192881] [2021-11-21 00:15:17,173 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1164192881] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:15:17,173 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [271727106] [2021-11-21 00:15:17,174 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-21 00:15:17,174 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:15:17,174 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_05bfa4f4-06e3-4fa5-985d-771be0ff54c3/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:15:17,199 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_05bfa4f4-06e3-4fa5-985d-771be0ff54c3/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:15:17,216 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_05bfa4f4-06e3-4fa5-985d-771be0ff54c3/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2021-11-21 00:15:17,530 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:15:17,552 INFO L263 TraceCheckSpWp]: Trace formula consists of 2256 conjuncts, 202 conjunts are in the unsatisfiable core [2021-11-21 00:15:17,558 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:15:18,564 INFO L134 CoverageAnalysis]: Checked inductivity of 40715 backedges. 0 proven. 40000 refuted. 0 times theorem prover too weak. 715 trivial. 0 not checked. [2021-11-21 00:15:18,565 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:15:58,678 INFO L134 CoverageAnalysis]: Checked inductivity of 40715 backedges. 0 proven. 40000 refuted. 0 times theorem prover too weak. 715 trivial. 0 not checked. [2021-11-21 00:15:58,678 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [271727106] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:15:58,679 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1691080407] [2021-11-21 00:15:58,680 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-21 00:15:58,680 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:15:58,680 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:15:58,681 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:15:58,681 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:15:58,701 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:15:58,702 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:15:58,703 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 22 [2021-11-21 00:15:58,775 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:15:58,777 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 39 treesize of output 41 [2021-11-21 00:15:58,914 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:15:58,916 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:15:58,918 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:15:58,931 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-21 00:15:58,932 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 200 treesize of output 188 [2021-11-21 00:15:59,263 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 21 [2021-11-21 00:15:59,355 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 21 [2021-11-21 00:16:00,006 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:16:01,064 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:16:01,064 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:16:01,064 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [202, 202, 202] total 404 [2021-11-21 00:16:01,065 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1198479146] [2021-11-21 00:16:01,065 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 00:16:01,067 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 405 states [2021-11-21 00:16:01,067 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:16:01,079 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 405 interpolants. [2021-11-21 00:16:01,085 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=81825, Invalid=85865, Unknown=0, NotChecked=0, Total=167690 [2021-11-21 00:16:01,086 INFO L87 Difference]: Start difference. First operand 470 states and 471 transitions. Second operand has 405 states, 405 states have (on average 2.0024691358024693) internal successors, (811), 404 states have internal predecessors, (811), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:20:05,542 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 00:20:05,542 INFO L93 Difference]: Finished difference Result 2396 states and 2397 transitions. [2021-11-21 00:20:05,543 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 404 states. [2021-11-21 00:20:05,543 INFO L78 Accepts]: Start accepts. Automaton has has 405 states, 405 states have (on average 2.0024691358024693) internal successors, (811), 404 states have internal predecessors, (811), 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 469 [2021-11-21 00:20:05,545 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 00:20:05,558 INFO L225 Difference]: With dead ends: 2396 [2021-11-21 00:20:05,558 INFO L226 Difference]: Without dead ends: 2396 [2021-11-21 00:20:05,572 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1607 GetRequests, 1199 SyntacticMatches, 0 SemanticMatches, 408 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3815 ImplicationChecksByTransitivity, 53.1s TimeCoverageRelationStatistics Valid=81825, Invalid=85865, Unknown=0, NotChecked=0, Total=167690 [2021-11-21 00:20:05,573 INFO L933 BasicCegarLoop]: 1 mSDtfsCounter, 7604 mSDsluCounter, 402 mSDsCounter, 0 mSdLazyCounter, 1997 mSolverCounterSat, 2660 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7604 SdHoareTripleChecker+Valid, 403 SdHoareTripleChecker+Invalid, 4657 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 2660 IncrementalHoareTripleChecker+Valid, 1997 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.1s IncrementalHoareTripleChecker+Time [2021-11-21 00:20:05,573 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [7604 Valid, 403 Invalid, 4657 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [2660 Valid, 1997 Invalid, 0 Unknown, 0 Unchecked, 3.1s Time] [2021-11-21 00:20:05,577 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2396 states. [2021-11-21 00:20:05,601 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2396 to 874. [2021-11-21 00:20:05,603 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 874 states, 873 states have (on average 1.002290950744559) internal successors, (875), 873 states have internal predecessors, (875), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:20:05,607 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 874 states to 874 states and 875 transitions. [2021-11-21 00:20:05,607 INFO L78 Accepts]: Start accepts. Automaton has 874 states and 875 transitions. Word has length 469 [2021-11-21 00:20:05,608 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 00:20:05,608 INFO L470 AbstractCegarLoop]: Abstraction has 874 states and 875 transitions. [2021-11-21 00:20:05,609 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 405 states, 405 states have (on average 2.0024691358024693) internal successors, (811), 404 states have internal predecessors, (811), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 00:20:05,610 INFO L276 IsEmpty]: Start isEmpty. Operand 874 states and 875 transitions. [2021-11-21 00:20:05,649 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 874 [2021-11-21 00:20:05,649 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 00:20:05,650 INFO L514 BasicCegarLoop]: trace histogram [402, 402, 22, 22, 22, 1, 1, 1] [2021-11-21 00:20:05,695 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_05bfa4f4-06e3-4fa5-985d-771be0ff54c3/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2021-11-21 00:20:05,871 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14,12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_05bfa4f4-06e3-4fa5-985d-771be0ff54c3/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:20:05,872 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 2 more)] === [2021-11-21 00:20:05,872 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 00:20:05,872 INFO L85 PathProgramCache]: Analyzing trace with hash 1642720760, now seen corresponding path program 8 times [2021-11-21 00:20:05,873 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 00:20:05,873 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [150068527] [2021-11-21 00:20:05,873 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 00:20:05,873 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 00:20:08,766 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 00:21:03,828 INFO L134 CoverageAnalysis]: Checked inductivity of 162319 backedges. 0 proven. 161604 refuted. 0 times theorem prover too weak. 715 trivial. 0 not checked. [2021-11-21 00:21:03,828 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 00:21:03,828 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [150068527] [2021-11-21 00:21:03,829 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [150068527] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 00:21:03,829 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1759918983] [2021-11-21 00:21:03,829 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 00:21:03,829 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 00:21:03,829 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_05bfa4f4-06e3-4fa5-985d-771be0ff54c3/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 00:21:03,830 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_05bfa4f4-06e3-4fa5-985d-771be0ff54c3/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 00:21:03,831 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_05bfa4f4-06e3-4fa5-985d-771be0ff54c3/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2021-11-21 00:21:04,784 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 23 check-sat command(s) [2021-11-21 00:21:04,784 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 00:21:04,789 INFO L263 TraceCheckSpWp]: Trace formula consists of 476 conjuncts, 29 conjunts are in the unsatisfiable core [2021-11-21 00:21:04,802 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 00:21:06,854 INFO L134 CoverageAnalysis]: Checked inductivity of 162319 backedges. 402 proven. 715 refuted. 0 times theorem prover too weak. 161202 trivial. 0 not checked. [2021-11-21 00:21:06,854 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 00:21:14,241 INFO L134 CoverageAnalysis]: Checked inductivity of 162319 backedges. 402 proven. 715 refuted. 0 times theorem prover too weak. 161202 trivial. 0 not checked. [2021-11-21 00:21:14,241 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1759918983] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 00:21:14,242 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1311104198] [2021-11-21 00:21:14,244 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2021-11-21 00:21:14,244 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 00:21:14,244 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 00:21:14,245 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 00:21:14,245 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 00:21:14,280 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:21:14,281 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:21:14,282 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 22 [2021-11-21 00:21:14,406 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:21:14,408 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 34 treesize of output 36 [2021-11-21 00:21:14,523 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 00:21:14,525 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 00:21:14,549 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-21 00:21:14,549 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 190 treesize of output 189 [2021-11-21 00:21:15,007 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 21 [2021-11-21 00:21:15,096 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 21 [2021-11-21 00:21:15,840 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 00:21:18,204 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 00:21:18,204 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 00:21:18,205 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [404, 26, 26] total 455 [2021-11-21 00:21:18,205 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2112910367] [2021-11-21 00:21:18,205 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 00:21:18,208 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 455 states [2021-11-21 00:21:18,208 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 00:21:18,229 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 455 interpolants. [2021-11-21 00:21:18,245 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=92798, Invalid=118342, Unknown=0, NotChecked=0, Total=211140 [2021-11-21 00:21:18,247 INFO L87 Difference]: Start difference. First operand 874 states and 875 transitions. Second operand has 455 states, 455 states have (on average 2.0901098901098902) internal successors, (951), 455 states have internal predecessors, (951), 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)