./Ultimate.py --spec ../../sv-benchmarks/c/properties/valid-memsafety.prp --file ../../sv-benchmarks/c/array-memsafety/cstrpbrk-alloca-2.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_40a0d2f8-3e8e-41d4-891b-65088d0c913e/bin/utaipan-TEXQjIfE4P/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a0d2f8-3e8e-41d4-891b-65088d0c913e/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_40a0d2f8-3e8e-41d4-891b-65088d0c913e/bin/utaipan-TEXQjIfE4P/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a0d2f8-3e8e-41d4-891b-65088d0c913e/bin/utaipan-TEXQjIfE4P/config/TaipanMemDerefMemtrack.xml -i ../../sv-benchmarks/c/array-memsafety/cstrpbrk-alloca-2.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a0d2f8-3e8e-41d4-891b-65088d0c913e/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_40a0d2f8-3e8e-41d4-891b-65088d0c913e/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 4f4570e8b350d1c6ecce62e4659f1c324ac9794563382f5f25c3525057748138 --- Real Ultimate output --- This is Ultimate 0.2.1-dev-53f42b1 [2021-11-20 23:36:19,252 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-20 23:36:19,256 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-20 23:36:19,310 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-20 23:36:19,310 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-20 23:36:19,315 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-20 23:36:19,317 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-20 23:36:19,321 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-20 23:36:19,324 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-20 23:36:19,329 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-20 23:36:19,330 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-20 23:36:19,332 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-20 23:36:19,333 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-20 23:36:19,335 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-20 23:36:19,337 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-20 23:36:19,346 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-20 23:36:19,348 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-20 23:36:19,349 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-20 23:36:19,351 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-20 23:36:19,359 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-20 23:36:19,361 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-20 23:36:19,362 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-20 23:36:19,365 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-20 23:36:19,366 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-20 23:36:19,375 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-20 23:36:19,376 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-20 23:36:19,376 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-20 23:36:19,378 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-20 23:36:19,379 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-20 23:36:19,380 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-20 23:36:19,381 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-20 23:36:19,382 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-20 23:36:19,384 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-20 23:36:19,385 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-20 23:36:19,387 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-20 23:36:19,387 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-20 23:36:19,388 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-20 23:36:19,388 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-20 23:36:19,388 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-20 23:36:19,389 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-20 23:36:19,390 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-20 23:36:19,391 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a0d2f8-3e8e-41d4-891b-65088d0c913e/bin/utaipan-TEXQjIfE4P/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Default.epf [2021-11-20 23:36:19,422 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-20 23:36:19,423 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-20 23:36:19,425 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-20 23:36:19,425 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-20 23:36:19,426 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-20 23:36:19,426 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-20 23:36:19,427 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-20 23:36:19,427 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-20 23:36:19,427 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-20 23:36:19,427 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-20 23:36:19,427 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-20 23:36:19,427 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-20 23:36:19,428 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-20 23:36:19,428 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-20 23:36:19,428 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-20 23:36:19,428 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-20 23:36:19,428 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-20 23:36:19,429 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-20 23:36:19,429 INFO L136 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2021-11-20 23:36:19,429 INFO L138 SettingsManager]: * Create parallel compositions if possible=false [2021-11-20 23:36:19,430 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-20 23:36:19,430 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-20 23:36:19,430 INFO L138 SettingsManager]: * Check unreachability of error function in SV-COMP mode=false [2021-11-20 23:36:19,430 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-20 23:36:19,430 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-20 23:36:19,431 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-20 23:36:19,431 INFO L138 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2021-11-20 23:36:19,431 INFO L138 SettingsManager]: * Bitprecise bitfields=true [2021-11-20 23:36:19,431 INFO L138 SettingsManager]: * SV-COMP memtrack compatibility mode=true [2021-11-20 23:36:19,431 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-20 23:36:19,432 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-11-20 23:36:19,432 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-20 23:36:19,432 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-20 23:36:19,432 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-20 23:36:19,432 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-20 23:36:19,432 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-20 23:36:19,433 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-20 23:36:19,433 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-20 23:36:19,433 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-20 23:36:19,433 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-20 23:36:19,433 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-20 23:36:19,434 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-20 23:36:19,434 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_40a0d2f8-3e8e-41d4-891b-65088d0c913e/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a0d2f8-3e8e-41d4-891b-65088d0c913e/bin/utaipan-TEXQjIfE4P Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 4f4570e8b350d1c6ecce62e4659f1c324ac9794563382f5f25c3525057748138 [2021-11-20 23:36:19,761 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-20 23:36:19,798 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-20 23:36:19,800 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-20 23:36:19,801 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-20 23:36:19,802 INFO L275 PluginConnector]: CDTParser initialized [2021-11-20 23:36:19,804 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a0d2f8-3e8e-41d4-891b-65088d0c913e/bin/utaipan-TEXQjIfE4P/../../sv-benchmarks/c/array-memsafety/cstrpbrk-alloca-2.i [2021-11-20 23:36:19,878 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a0d2f8-3e8e-41d4-891b-65088d0c913e/bin/utaipan-TEXQjIfE4P/data/b5855498c/d9640d1598b64f2fbe5aafc7004f60ba/FLAGff042083f [2021-11-20 23:36:20,439 INFO L306 CDTParser]: Found 1 translation units. [2021-11-20 23:36:20,443 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a0d2f8-3e8e-41d4-891b-65088d0c913e/sv-benchmarks/c/array-memsafety/cstrpbrk-alloca-2.i [2021-11-20 23:36:20,468 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a0d2f8-3e8e-41d4-891b-65088d0c913e/bin/utaipan-TEXQjIfE4P/data/b5855498c/d9640d1598b64f2fbe5aafc7004f60ba/FLAGff042083f [2021-11-20 23:36:20,720 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a0d2f8-3e8e-41d4-891b-65088d0c913e/bin/utaipan-TEXQjIfE4P/data/b5855498c/d9640d1598b64f2fbe5aafc7004f60ba [2021-11-20 23:36:20,723 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-20 23:36:20,726 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-20 23:36:20,730 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-20 23:36:20,730 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-20 23:36:20,734 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-20 23:36:20,736 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.11 11:36:20" (1/1) ... [2021-11-20 23:36:20,738 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@2e3d7a45 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:36:20, skipping insertion in model container [2021-11-20 23:36:20,738 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.11 11:36:20" (1/1) ... [2021-11-20 23:36:20,746 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-20 23:36:20,805 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-20 23:36:21,146 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-20 23:36:21,154 INFO L203 MainTranslator]: Completed pre-run [2021-11-20 23:36:21,207 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-20 23:36:21,237 INFO L208 MainTranslator]: Completed translation [2021-11-20 23:36:21,238 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:36:21 WrapperNode [2021-11-20 23:36:21,239 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-20 23:36:21,240 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-20 23:36:21,240 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-20 23:36:21,240 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-20 23:36:21,248 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:36:21" (1/1) ... [2021-11-20 23:36:21,283 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:36:21" (1/1) ... [2021-11-20 23:36:21,311 INFO L137 Inliner]: procedures = 117, calls = 18, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 101 [2021-11-20 23:36:21,311 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-20 23:36:21,312 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-20 23:36:21,312 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-20 23:36:21,312 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-20 23:36:21,320 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:36:21" (1/1) ... [2021-11-20 23:36:21,320 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:36:21" (1/1) ... [2021-11-20 23:36:21,324 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:36:21" (1/1) ... [2021-11-20 23:36:21,324 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:36:21" (1/1) ... [2021-11-20 23:36:21,330 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:36:21" (1/1) ... [2021-11-20 23:36:21,335 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:36:21" (1/1) ... [2021-11-20 23:36:21,337 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:36:21" (1/1) ... [2021-11-20 23:36:21,340 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-20 23:36:21,341 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-20 23:36:21,341 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-20 23:36:21,341 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-20 23:36:21,342 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:36:21" (1/1) ... [2021-11-20 23:36:21,359 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-20 23:36:21,371 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a0d2f8-3e8e-41d4-891b-65088d0c913e/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:36:21,382 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a0d2f8-3e8e-41d4-891b-65088d0c913e/bin/utaipan-TEXQjIfE4P/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-20 23:36:21,387 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a0d2f8-3e8e-41d4-891b-65088d0c913e/bin/utaipan-TEXQjIfE4P/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-20 23:36:21,418 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-11-20 23:36:21,419 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-11-20 23:36:21,419 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-11-20 23:36:21,419 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-11-20 23:36:21,419 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-20 23:36:21,419 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-20 23:36:21,565 INFO L236 CfgBuilder]: Building ICFG [2021-11-20 23:36:21,567 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-20 23:36:21,905 INFO L277 CfgBuilder]: Performing block encoding [2021-11-20 23:36:21,945 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-20 23:36:21,946 INFO L301 CfgBuilder]: Removed 4 assume(true) statements. [2021-11-20 23:36:21,948 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.11 11:36:21 BoogieIcfgContainer [2021-11-20 23:36:21,949 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-20 23:36:21,950 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-20 23:36:21,950 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-20 23:36:21,958 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-20 23:36:21,958 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.11 11:36:20" (1/3) ... [2021-11-20 23:36:21,959 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@70ccbce9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.11 11:36:21, skipping insertion in model container [2021-11-20 23:36:21,960 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:36:21" (2/3) ... [2021-11-20 23:36:21,960 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@70ccbce9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.11 11:36:21, skipping insertion in model container [2021-11-20 23:36:21,960 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.11 11:36:21" (3/3) ... [2021-11-20 23:36:21,962 INFO L111 eAbstractionObserver]: Analyzing ICFG cstrpbrk-alloca-2.i [2021-11-20 23:36:21,971 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-20 23:36:21,971 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 19 error locations. [2021-11-20 23:36:22,020 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-20 23:36:22,027 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 [2021-11-20 23:36:22,027 INFO L340 AbstractCegarLoop]: Starting to check reachability of 19 error locations. [2021-11-20 23:36:22,041 INFO L276 IsEmpty]: Start isEmpty. Operand has 39 states, 19 states have (on average 2.4210526315789473) internal successors, (46), 38 states have internal predecessors, (46), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:36:22,048 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2021-11-20 23:36:22,048 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:36:22,049 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1] [2021-11-20 23:36:22,049 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 15 more)] === [2021-11-20 23:36:22,054 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:36:22,055 INFO L85 PathProgramCache]: Analyzing trace with hash 162186, now seen corresponding path program 1 times [2021-11-20 23:36:22,064 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:36:22,076 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [936923296] [2021-11-20 23:36:22,076 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:36:22,077 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:36:22,221 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:36:22,320 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:36:22,320 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:36:22,321 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [936923296] [2021-11-20 23:36:22,322 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [936923296] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:36:22,322 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 23:36:22,322 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2021-11-20 23:36:22,324 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [998922592] [2021-11-20 23:36:22,325 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:36:22,330 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-20 23:36:22,331 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:36:22,365 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-20 23:36:22,366 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-20 23:36:22,371 INFO L87 Difference]: Start difference. First operand has 39 states, 19 states have (on average 2.4210526315789473) internal successors, (46), 38 states have internal predecessors, (46), 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, 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) [2021-11-20 23:36:22,470 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:36:22,470 INFO L93 Difference]: Finished difference Result 37 states and 42 transitions. [2021-11-20 23:36:22,471 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-20 23:36:22,473 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 [2021-11-20 23:36:22,474 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:36:22,482 INFO L225 Difference]: With dead ends: 37 [2021-11-20 23:36:22,482 INFO L226 Difference]: Without dead ends: 36 [2021-11-20 23:36:22,485 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 [2021-11-20 23:36:22,492 INFO L933 BasicCegarLoop]: 18 mSDtfsCounter, 37 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 27 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 37 SdHoareTripleChecker+Valid, 18 SdHoareTripleChecker+Invalid, 28 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 27 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-20 23:36:22,493 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [37 Valid, 18 Invalid, 28 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 27 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-20 23:36:22,508 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2021-11-20 23:36:22,519 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2021-11-20 23:36:22,520 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 36 states, 19 states have (on average 2.1578947368421053) internal successors, (41), 35 states have internal predecessors, (41), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:36:22,521 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 41 transitions. [2021-11-20 23:36:22,522 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 41 transitions. Word has length 3 [2021-11-20 23:36:22,522 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:36:22,522 INFO L470 AbstractCegarLoop]: Abstraction has 36 states and 41 transitions. [2021-11-20 23:36:22,523 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) [2021-11-20 23:36:22,523 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 41 transitions. [2021-11-20 23:36:22,523 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2021-11-20 23:36:22,523 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:36:22,523 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1] [2021-11-20 23:36:22,523 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-20 23:36:22,524 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 15 more)] === [2021-11-20 23:36:22,524 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:36:22,525 INFO L85 PathProgramCache]: Analyzing trace with hash 162187, now seen corresponding path program 1 times [2021-11-20 23:36:22,525 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:36:22,525 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1172292487] [2021-11-20 23:36:22,525 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:36:22,526 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:36:22,547 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:36:22,608 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:36:22,609 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:36:22,609 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1172292487] [2021-11-20 23:36:22,609 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1172292487] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:36:22,610 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 23:36:22,610 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-20 23:36:22,610 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2024443038] [2021-11-20 23:36:22,610 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:36:22,612 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-20 23:36:22,612 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:36:22,612 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-20 23:36:22,613 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-20 23:36:22,613 INFO L87 Difference]: Start difference. First operand 36 states and 41 transitions. Second operand has 4 states, 3 states have (on average 1.0) internal successors, (3), 3 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) [2021-11-20 23:36:22,716 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:36:22,716 INFO L93 Difference]: Finished difference Result 70 states and 80 transitions. [2021-11-20 23:36:22,716 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-20 23:36:22,716 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 1.0) internal successors, (3), 3 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 [2021-11-20 23:36:22,717 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:36:22,718 INFO L225 Difference]: With dead ends: 70 [2021-11-20 23:36:22,718 INFO L226 Difference]: Without dead ends: 70 [2021-11-20 23:36:22,719 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-20 23:36:22,720 INFO L933 BasicCegarLoop]: 19 mSDtfsCounter, 38 mSDsluCounter, 40 mSDsCounter, 0 mSdLazyCounter, 67 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 38 SdHoareTripleChecker+Valid, 55 SdHoareTripleChecker+Invalid, 67 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 67 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-20 23:36:22,721 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [38 Valid, 55 Invalid, 67 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 67 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-20 23:36:22,722 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2021-11-20 23:36:22,726 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 38. [2021-11-20 23:36:22,727 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 38 states, 21 states have (on average 2.0952380952380953) internal successors, (44), 37 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:36:22,728 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38 states to 38 states and 44 transitions. [2021-11-20 23:36:22,728 INFO L78 Accepts]: Start accepts. Automaton has 38 states and 44 transitions. Word has length 3 [2021-11-20 23:36:22,728 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:36:22,728 INFO L470 AbstractCegarLoop]: Abstraction has 38 states and 44 transitions. [2021-11-20 23:36:22,729 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 1.0) internal successors, (3), 3 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) [2021-11-20 23:36:22,729 INFO L276 IsEmpty]: Start isEmpty. Operand 38 states and 44 transitions. [2021-11-20 23:36:22,729 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2021-11-20 23:36:22,729 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:36:22,729 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1] [2021-11-20 23:36:22,730 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-11-20 23:36:22,730 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 15 more)] === [2021-11-20 23:36:22,730 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:36:22,731 INFO L85 PathProgramCache]: Analyzing trace with hash 5136908, now seen corresponding path program 1 times [2021-11-20 23:36:22,731 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:36:22,731 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [916641543] [2021-11-20 23:36:22,731 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:36:22,732 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:36:22,750 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:36:22,796 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:36:22,796 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:36:22,797 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [916641543] [2021-11-20 23:36:22,797 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [916641543] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:36:22,797 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 23:36:22,797 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2021-11-20 23:36:22,798 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [970850532] [2021-11-20 23:36:22,798 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:36:22,798 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-20 23:36:22,798 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:36:22,799 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-20 23:36:22,799 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-20 23:36:22,799 INFO L87 Difference]: Start difference. First operand 38 states and 44 transitions. Second operand has 3 states, 2 states have (on average 2.0) internal successors, (4), 2 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:36:22,852 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:36:22,853 INFO L93 Difference]: Finished difference Result 37 states and 43 transitions. [2021-11-20 23:36:22,853 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-20 23:36:22,853 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 2.0) internal successors, (4), 2 states have internal predecessors, (4), 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 4 [2021-11-20 23:36:22,853 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:36:22,855 INFO L225 Difference]: With dead ends: 37 [2021-11-20 23:36:22,855 INFO L226 Difference]: Without dead ends: 37 [2021-11-20 23:36:22,856 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 [2021-11-20 23:36:22,860 INFO L933 BasicCegarLoop]: 18 mSDtfsCounter, 37 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 22 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 37 SdHoareTripleChecker+Valid, 18 SdHoareTripleChecker+Invalid, 22 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 22 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-20 23:36:22,860 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [37 Valid, 18 Invalid, 22 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 22 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-20 23:36:22,861 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37 states. [2021-11-20 23:36:22,864 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37 to 37. [2021-11-20 23:36:22,864 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 37 states, 21 states have (on average 2.0476190476190474) internal successors, (43), 36 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:36:22,865 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 43 transitions. [2021-11-20 23:36:22,866 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 43 transitions. Word has length 4 [2021-11-20 23:36:22,866 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:36:22,866 INFO L470 AbstractCegarLoop]: Abstraction has 37 states and 43 transitions. [2021-11-20 23:36:22,866 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 2.0) internal successors, (4), 2 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:36:22,866 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 43 transitions. [2021-11-20 23:36:22,867 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2021-11-20 23:36:22,867 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:36:22,867 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1] [2021-11-20 23:36:22,867 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-11-20 23:36:22,867 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr2REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 15 more)] === [2021-11-20 23:36:22,868 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:36:22,868 INFO L85 PathProgramCache]: Analyzing trace with hash 5134015, now seen corresponding path program 1 times [2021-11-20 23:36:22,868 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:36:22,869 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [211796128] [2021-11-20 23:36:22,869 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:36:22,869 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:36:22,903 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:36:22,927 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:36:22,928 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:36:22,928 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [211796128] [2021-11-20 23:36:22,928 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [211796128] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:36:22,928 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 23:36:22,928 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2021-11-20 23:36:22,929 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1294044677] [2021-11-20 23:36:22,931 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:36:22,931 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-20 23:36:22,931 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:36:22,932 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-20 23:36:22,932 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-20 23:36:22,935 INFO L87 Difference]: Start difference. First operand 37 states and 43 transitions. Second operand has 3 states, 2 states have (on average 2.0) internal successors, (4), 2 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:36:22,989 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:36:22,989 INFO L93 Difference]: Finished difference Result 35 states and 41 transitions. [2021-11-20 23:36:22,990 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-20 23:36:22,990 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 2.0) internal successors, (4), 2 states have internal predecessors, (4), 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 4 [2021-11-20 23:36:22,991 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:36:22,991 INFO L225 Difference]: With dead ends: 35 [2021-11-20 23:36:22,991 INFO L226 Difference]: Without dead ends: 35 [2021-11-20 23:36:22,993 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 [2021-11-20 23:36:22,995 INFO L933 BasicCegarLoop]: 17 mSDtfsCounter, 33 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 23 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 33 SdHoareTripleChecker+Valid, 17 SdHoareTripleChecker+Invalid, 24 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 23 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-20 23:36:22,996 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [33 Valid, 17 Invalid, 24 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 23 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-20 23:36:22,997 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2021-11-20 23:36:22,999 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 35. [2021-11-20 23:36:23,000 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 35 states, 21 states have (on average 1.9523809523809523) internal successors, (41), 34 states have internal predecessors, (41), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:36:23,001 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 41 transitions. [2021-11-20 23:36:23,001 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 41 transitions. Word has length 4 [2021-11-20 23:36:23,001 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:36:23,001 INFO L470 AbstractCegarLoop]: Abstraction has 35 states and 41 transitions. [2021-11-20 23:36:23,002 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 2.0) internal successors, (4), 2 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:36:23,002 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 41 transitions. [2021-11-20 23:36:23,002 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2021-11-20 23:36:23,002 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:36:23,002 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1] [2021-11-20 23:36:23,003 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-11-20 23:36:23,003 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 15 more)] === [2021-11-20 23:36:23,003 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:36:23,003 INFO L85 PathProgramCache]: Analyzing trace with hash 5134016, now seen corresponding path program 1 times [2021-11-20 23:36:23,004 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:36:23,004 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1172438147] [2021-11-20 23:36:23,004 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:36:23,004 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:36:23,017 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:36:23,076 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:36:23,076 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:36:23,077 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1172438147] [2021-11-20 23:36:23,077 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1172438147] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:36:23,077 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 23:36:23,077 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-20 23:36:23,077 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [846190144] [2021-11-20 23:36:23,078 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:36:23,078 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-20 23:36:23,078 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:36:23,079 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-20 23:36:23,079 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-20 23:36:23,079 INFO L87 Difference]: Start difference. First operand 35 states and 41 transitions. Second operand has 5 states, 4 states have (on average 1.0) internal successors, (4), 4 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:36:23,163 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:36:23,163 INFO L93 Difference]: Finished difference Result 63 states and 73 transitions. [2021-11-20 23:36:23,164 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-20 23:36:23,164 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 1.0) internal successors, (4), 4 states have internal predecessors, (4), 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 4 [2021-11-20 23:36:23,164 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:36:23,165 INFO L225 Difference]: With dead ends: 63 [2021-11-20 23:36:23,165 INFO L226 Difference]: Without dead ends: 63 [2021-11-20 23:36:23,165 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-20 23:36:23,172 INFO L933 BasicCegarLoop]: 16 mSDtfsCounter, 68 mSDsluCounter, 34 mSDsCounter, 0 mSdLazyCounter, 65 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 68 SdHoareTripleChecker+Valid, 48 SdHoareTripleChecker+Invalid, 66 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 65 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-20 23:36:23,173 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [68 Valid, 48 Invalid, 66 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 65 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-20 23:36:23,177 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2021-11-20 23:36:23,186 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 37. [2021-11-20 23:36:23,190 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 37 states, 23 states have (on average 1.9130434782608696) internal successors, (44), 36 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:36:23,190 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 44 transitions. [2021-11-20 23:36:23,191 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 44 transitions. Word has length 4 [2021-11-20 23:36:23,192 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:36:23,192 INFO L470 AbstractCegarLoop]: Abstraction has 37 states and 44 transitions. [2021-11-20 23:36:23,192 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 1.0) internal successors, (4), 4 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:36:23,192 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 44 transitions. [2021-11-20 23:36:23,193 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2021-11-20 23:36:23,193 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:36:23,193 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1] [2021-11-20 23:36:23,193 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-11-20 23:36:23,193 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr7REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 15 more)] === [2021-11-20 23:36:23,194 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:36:23,194 INFO L85 PathProgramCache]: Analyzing trace with hash 159244142, now seen corresponding path program 1 times [2021-11-20 23:36:23,194 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:36:23,194 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1916451717] [2021-11-20 23:36:23,195 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:36:23,195 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:36:23,213 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:36:23,275 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:36:23,276 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:36:23,276 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1916451717] [2021-11-20 23:36:23,277 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1916451717] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:36:23,277 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 23:36:23,277 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2021-11-20 23:36:23,277 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [420473078] [2021-11-20 23:36:23,278 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:36:23,278 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-20 23:36:23,279 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:36:23,279 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-20 23:36:23,279 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-20 23:36:23,280 INFO L87 Difference]: Start difference. First operand 37 states and 44 transitions. Second operand has 3 states, 2 states have (on average 2.5) internal successors, (5), 2 states have internal predecessors, (5), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:36:23,315 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:36:23,315 INFO L93 Difference]: Finished difference Result 36 states and 43 transitions. [2021-11-20 23:36:23,316 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-20 23:36:23,317 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 2.5) internal successors, (5), 2 states have internal predecessors, (5), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 5 [2021-11-20 23:36:23,317 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:36:23,319 INFO L225 Difference]: With dead ends: 36 [2021-11-20 23:36:23,319 INFO L226 Difference]: Without dead ends: 36 [2021-11-20 23:36:23,320 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 [2021-11-20 23:36:23,325 INFO L933 BasicCegarLoop]: 16 mSDtfsCounter, 33 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 21 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 33 SdHoareTripleChecker+Valid, 16 SdHoareTripleChecker+Invalid, 21 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 21 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-20 23:36:23,328 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [33 Valid, 16 Invalid, 21 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 21 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-20 23:36:23,329 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2021-11-20 23:36:23,337 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2021-11-20 23:36:23,338 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 36 states, 23 states have (on average 1.8695652173913044) internal successors, (43), 35 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:36:23,340 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 43 transitions. [2021-11-20 23:36:23,341 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 43 transitions. Word has length 5 [2021-11-20 23:36:23,342 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:36:23,342 INFO L470 AbstractCegarLoop]: Abstraction has 36 states and 43 transitions. [2021-11-20 23:36:23,342 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 2.5) internal successors, (5), 2 states have internal predecessors, (5), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:36:23,342 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 43 transitions. [2021-11-20 23:36:23,343 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2021-11-20 23:36:23,343 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:36:23,343 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1] [2021-11-20 23:36:23,344 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2021-11-20 23:36:23,344 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 15 more)] === [2021-11-20 23:36:23,344 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:36:23,345 INFO L85 PathProgramCache]: Analyzing trace with hash 155961429, now seen corresponding path program 1 times [2021-11-20 23:36:23,345 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:36:23,345 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1586287777] [2021-11-20 23:36:23,345 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:36:23,346 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:36:23,378 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:36:23,480 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:36:23,480 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:36:23,480 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1586287777] [2021-11-20 23:36:23,481 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1586287777] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:36:23,481 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2073914055] [2021-11-20 23:36:23,481 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:36:23,481 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:36:23,482 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a0d2f8-3e8e-41d4-891b-65088d0c913e/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:36:23,483 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a0d2f8-3e8e-41d4-891b-65088d0c913e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:36:23,502 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a0d2f8-3e8e-41d4-891b-65088d0c913e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-20 23:36:23,534 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:36:23,537 INFO L263 TraceCheckSpWp]: Trace formula consists of 54 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-20 23:36:23,541 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:36:23,631 INFO L354 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2021-11-20 23:36:23,632 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 1 case distinctions, treesize of input 18 treesize of output 19 [2021-11-20 23:36:23,644 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 13 [2021-11-20 23:36:23,723 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:36:23,723 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:36:23,891 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:36:23,891 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2073914055] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:36:23,891 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2091265262] [2021-11-20 23:36:23,909 INFO L159 IcfgInterpreter]: Started Sifa with 4 locations of interest [2021-11-20 23:36:23,910 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:36:23,914 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:36:23,920 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:36:23,921 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:36:24,105 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:24,107 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-20 23:36:24,403 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 16 [2021-11-20 23:36:24,744 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-20 23:36:24,744 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 194 treesize of output 193 [2021-11-20 23:36:25,620 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:36:25,854 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 23 treesize of output 19 [2021-11-20 23:36:26,002 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:36:26,474 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:36:26,475 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:36:26,475 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3, 3] total 7 [2021-11-20 23:36:26,475 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [55508639] [2021-11-20 23:36:26,475 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:36:26,476 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2021-11-20 23:36:26,476 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:36:26,476 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2021-11-20 23:36:26,476 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=99, Unknown=0, NotChecked=0, Total=132 [2021-11-20 23:36:26,477 INFO L87 Difference]: Start difference. First operand 36 states and 43 transitions. Second operand has 9 states, 8 states have (on average 1.625) internal successors, (13), 8 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) [2021-11-20 23:36:26,705 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:36:26,705 INFO L93 Difference]: Finished difference Result 96 states and 114 transitions. [2021-11-20 23:36:26,706 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-20 23:36:26,706 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 8 states have (on average 1.625) internal successors, (13), 8 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 [2021-11-20 23:36:26,706 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:36:26,707 INFO L225 Difference]: With dead ends: 96 [2021-11-20 23:36:26,707 INFO L226 Difference]: Without dead ends: 96 [2021-11-20 23:36:26,708 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 19 GetRequests, 5 SyntacticMatches, 1 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=56, Invalid=154, Unknown=0, NotChecked=0, Total=210 [2021-11-20 23:36:26,708 INFO L933 BasicCegarLoop]: 48 mSDtfsCounter, 200 mSDsluCounter, 126 mSDsCounter, 0 mSdLazyCounter, 187 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 200 SdHoareTripleChecker+Valid, 160 SdHoareTripleChecker+Invalid, 191 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 187 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-20 23:36:26,709 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [200 Valid, 160 Invalid, 191 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 187 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-20 23:36:26,709 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2021-11-20 23:36:26,712 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 33. [2021-11-20 23:36:26,712 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 33 states, 21 states have (on average 1.8571428571428572) internal successors, (39), 32 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:36:26,713 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 39 transitions. [2021-11-20 23:36:26,713 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 39 transitions. Word has length 5 [2021-11-20 23:36:26,713 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:36:26,713 INFO L470 AbstractCegarLoop]: Abstraction has 33 states and 39 transitions. [2021-11-20 23:36:26,713 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 8 states have (on average 1.625) internal successors, (13), 8 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) [2021-11-20 23:36:26,713 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 39 transitions. [2021-11-20 23:36:26,714 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2021-11-20 23:36:26,714 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:36:26,714 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2021-11-20 23:36:26,755 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a0d2f8-3e8e-41d4-891b-65088d0c913e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-20 23:36:26,914 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a0d2f8-3e8e-41d4-891b-65088d0c913e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:36:26,915 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr8REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 15 more)] === [2021-11-20 23:36:26,915 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:36:26,915 INFO L85 PathProgramCache]: Analyzing trace with hash 641603338, now seen corresponding path program 1 times [2021-11-20 23:36:26,915 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:36:26,916 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [294610144] [2021-11-20 23:36:26,916 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:36:26,916 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:36:26,926 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:36:26,945 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:36:26,945 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:36:26,945 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [294610144] [2021-11-20 23:36:26,945 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [294610144] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:36:26,945 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 23:36:26,946 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-20 23:36:26,946 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1561455432] [2021-11-20 23:36:26,946 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:36:26,946 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-20 23:36:26,946 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:36:26,947 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-20 23:36:26,947 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-20 23:36:26,947 INFO L87 Difference]: Start difference. First operand 33 states and 39 transitions. Second operand has 4 states, 3 states have (on average 2.0) internal successors, (6), 4 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:36:26,989 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:36:26,989 INFO L93 Difference]: Finished difference Result 31 states and 37 transitions. [2021-11-20 23:36:26,989 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-20 23:36:26,989 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 2.0) internal successors, (6), 4 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 6 [2021-11-20 23:36:26,990 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:36:26,990 INFO L225 Difference]: With dead ends: 31 [2021-11-20 23:36:26,990 INFO L226 Difference]: Without dead ends: 31 [2021-11-20 23:36:26,990 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-20 23:36:26,991 INFO L933 BasicCegarLoop]: 14 mSDtfsCounter, 50 mSDsluCounter, 5 mSDsCounter, 0 mSdLazyCounter, 30 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 50 SdHoareTripleChecker+Valid, 17 SdHoareTripleChecker+Invalid, 34 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 30 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-20 23:36:26,992 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [50 Valid, 17 Invalid, 34 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 30 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-20 23:36:26,992 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2021-11-20 23:36:26,994 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2021-11-20 23:36:26,994 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 31 states, 21 states have (on average 1.7619047619047619) internal successors, (37), 30 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) [2021-11-20 23:36:26,994 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 37 transitions. [2021-11-20 23:36:26,994 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 37 transitions. Word has length 6 [2021-11-20 23:36:26,995 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:36:26,995 INFO L470 AbstractCegarLoop]: Abstraction has 31 states and 37 transitions. [2021-11-20 23:36:26,995 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 2.0) internal successors, (6), 4 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:36:26,995 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 37 transitions. [2021-11-20 23:36:26,995 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2021-11-20 23:36:26,995 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:36:26,996 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2021-11-20 23:36:26,996 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2021-11-20 23:36:26,996 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 15 more)] === [2021-11-20 23:36:26,996 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:36:26,996 INFO L85 PathProgramCache]: Analyzing trace with hash 641603339, now seen corresponding path program 1 times [2021-11-20 23:36:26,997 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:36:26,997 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [819678938] [2021-11-20 23:36:26,997 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:36:26,997 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:36:27,007 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:36:27,039 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:36:27,039 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:36:27,039 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [819678938] [2021-11-20 23:36:27,040 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [819678938] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:36:27,040 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 23:36:27,040 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-20 23:36:27,040 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [153344259] [2021-11-20 23:36:27,040 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:36:27,041 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-20 23:36:27,041 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:36:27,041 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-20 23:36:27,041 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-20 23:36:27,041 INFO L87 Difference]: Start difference. First operand 31 states and 37 transitions. Second operand has 5 states, 4 states have (on average 1.5) internal successors, (6), 4 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:36:27,095 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:36:27,095 INFO L93 Difference]: Finished difference Result 50 states and 59 transitions. [2021-11-20 23:36:27,095 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-20 23:36:27,095 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 1.5) internal successors, (6), 4 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 6 [2021-11-20 23:36:27,096 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:36:27,096 INFO L225 Difference]: With dead ends: 50 [2021-11-20 23:36:27,096 INFO L226 Difference]: Without dead ends: 50 [2021-11-20 23:36:27,096 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=13, Invalid=17, Unknown=0, NotChecked=0, Total=30 [2021-11-20 23:36:27,097 INFO L933 BasicCegarLoop]: 14 mSDtfsCounter, 75 mSDsluCounter, 16 mSDsCounter, 0 mSdLazyCounter, 39 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 75 SdHoareTripleChecker+Valid, 28 SdHoareTripleChecker+Invalid, 42 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 39 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-20 23:36:27,097 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [75 Valid, 28 Invalid, 42 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 39 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-20 23:36:27,098 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2021-11-20 23:36:27,099 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 34. [2021-11-20 23:36:27,100 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 34 states, 24 states have (on average 1.7083333333333333) internal successors, (41), 33 states have internal predecessors, (41), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:36:27,103 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 34 states to 34 states and 41 transitions. [2021-11-20 23:36:27,104 INFO L78 Accepts]: Start accepts. Automaton has 34 states and 41 transitions. Word has length 6 [2021-11-20 23:36:27,104 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:36:27,104 INFO L470 AbstractCegarLoop]: Abstraction has 34 states and 41 transitions. [2021-11-20 23:36:27,104 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 1.5) internal successors, (6), 4 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:36:27,104 INFO L276 IsEmpty]: Start isEmpty. Operand 34 states and 41 transitions. [2021-11-20 23:36:27,105 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2021-11-20 23:36:27,105 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:36:27,105 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1] [2021-11-20 23:36:27,105 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2021-11-20 23:36:27,105 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 15 more)] === [2021-11-20 23:36:27,107 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:36:27,107 INFO L85 PathProgramCache]: Analyzing trace with hash 638899314, now seen corresponding path program 1 times [2021-11-20 23:36:27,107 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:36:27,107 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [972537850] [2021-11-20 23:36:27,107 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:36:27,108 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:36:27,127 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:36:27,195 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:36:27,195 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:36:27,195 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [972537850] [2021-11-20 23:36:27,195 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [972537850] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:36:27,195 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1635225040] [2021-11-20 23:36:27,196 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:36:27,196 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:36:27,196 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a0d2f8-3e8e-41d4-891b-65088d0c913e/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:36:27,197 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a0d2f8-3e8e-41d4-891b-65088d0c913e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:36:27,220 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a0d2f8-3e8e-41d4-891b-65088d0c913e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-20 23:36:27,245 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:36:27,246 INFO L263 TraceCheckSpWp]: Trace formula consists of 57 conjuncts, 11 conjunts are in the unsatisfiable core [2021-11-20 23:36:27,247 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:36:27,266 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-20 23:36:27,266 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 1 case distinctions, treesize of input 9 treesize of output 15 [2021-11-20 23:36:27,327 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:36:27,327 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:36:27,486 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:36:27,486 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1635225040] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:36:27,486 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1244606993] [2021-11-20 23:36:27,488 INFO L159 IcfgInterpreter]: Started Sifa with 5 locations of interest [2021-11-20 23:36:27,488 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:36:27,489 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:36:27,489 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:36:27,489 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:36:27,557 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:27,558 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-20 23:36:27,909 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 16 [2021-11-20 23:36:28,452 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-20 23:36:28,453 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 208 treesize of output 207 [2021-11-20 23:36:29,104 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:36:29,266 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:36:29,501 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:36:29,502 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:36:29,502 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 9 [2021-11-20 23:36:29,502 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [124334206] [2021-11-20 23:36:29,502 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:36:29,502 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2021-11-20 23:36:29,502 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:36:29,502 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2021-11-20 23:36:29,503 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=50, Invalid=160, Unknown=0, NotChecked=0, Total=210 [2021-11-20 23:36:29,503 INFO L87 Difference]: Start difference. First operand 34 states and 41 transitions. Second operand has 11 states, 10 states have (on average 1.5) internal successors, (15), 10 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:36:29,676 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:36:29,676 INFO L93 Difference]: Finished difference Result 86 states and 102 transitions. [2021-11-20 23:36:29,677 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-20 23:36:29,677 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 10 states have (on average 1.5) internal successors, (15), 10 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 6 [2021-11-20 23:36:29,677 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:36:29,678 INFO L225 Difference]: With dead ends: 86 [2021-11-20 23:36:29,678 INFO L226 Difference]: Without dead ends: 86 [2021-11-20 23:36:29,678 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 23 GetRequests, 6 SyntacticMatches, 1 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 64 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=79, Invalid=227, Unknown=0, NotChecked=0, Total=306 [2021-11-20 23:36:29,679 INFO L933 BasicCegarLoop]: 40 mSDtfsCounter, 306 mSDsluCounter, 86 mSDsCounter, 0 mSdLazyCounter, 148 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 306 SdHoareTripleChecker+Valid, 120 SdHoareTripleChecker+Invalid, 157 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 148 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-20 23:36:29,679 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [306 Valid, 120 Invalid, 157 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 148 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-20 23:36:29,680 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86 states. [2021-11-20 23:36:29,681 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 31. [2021-11-20 23:36:29,682 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 31 states, 22 states have (on average 1.6818181818181819) internal successors, (37), 30 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) [2021-11-20 23:36:29,682 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 37 transitions. [2021-11-20 23:36:29,682 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 37 transitions. Word has length 6 [2021-11-20 23:36:29,682 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:36:29,682 INFO L470 AbstractCegarLoop]: Abstraction has 31 states and 37 transitions. [2021-11-20 23:36:29,682 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 10 states have (on average 1.5) internal successors, (15), 10 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:36:29,683 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 37 transitions. [2021-11-20 23:36:29,683 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2021-11-20 23:36:29,683 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:36:29,683 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:36:29,719 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a0d2f8-3e8e-41d4-891b-65088d0c913e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-20 23:36:29,884 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a0d2f8-3e8e-41d4-891b-65088d0c913e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:36:29,884 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr12REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 15 more)] === [2021-11-20 23:36:29,884 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:36:29,884 INFO L85 PathProgramCache]: Analyzing trace with hash 1400614513, now seen corresponding path program 1 times [2021-11-20 23:36:29,884 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:36:29,885 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1604399202] [2021-11-20 23:36:29,885 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:36:29,885 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:36:29,893 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:36:29,914 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:36:29,914 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:36:29,914 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1604399202] [2021-11-20 23:36:29,915 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1604399202] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:36:29,915 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 23:36:29,915 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-20 23:36:29,915 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1151559923] [2021-11-20 23:36:29,915 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:36:29,916 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-20 23:36:29,916 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:36:29,916 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-20 23:36:29,916 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-20 23:36:29,917 INFO L87 Difference]: Start difference. First operand 31 states and 37 transitions. Second operand has 4 states, 3 states have (on average 3.0) 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) [2021-11-20 23:36:29,963 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:36:29,964 INFO L93 Difference]: Finished difference Result 30 states and 36 transitions. [2021-11-20 23:36:29,964 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-20 23:36:29,964 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 3.0) 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 9 [2021-11-20 23:36:29,964 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:36:29,965 INFO L225 Difference]: With dead ends: 30 [2021-11-20 23:36:29,965 INFO L226 Difference]: Without dead ends: 30 [2021-11-20 23:36:29,965 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-20 23:36:29,966 INFO L933 BasicCegarLoop]: 14 mSDtfsCounter, 33 mSDsluCounter, 10 mSDsCounter, 0 mSdLazyCounter, 41 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 33 SdHoareTripleChecker+Valid, 20 SdHoareTripleChecker+Invalid, 45 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 41 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-20 23:36:29,966 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [33 Valid, 20 Invalid, 45 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 41 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-20 23:36:29,967 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2021-11-20 23:36:29,969 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 28. [2021-11-20 23:36:29,970 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28 states, 22 states have (on average 1.5454545454545454) internal successors, (34), 27 states have internal predecessors, (34), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:36:29,971 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 34 transitions. [2021-11-20 23:36:29,971 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 34 transitions. Word has length 9 [2021-11-20 23:36:29,971 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:36:29,972 INFO L470 AbstractCegarLoop]: Abstraction has 28 states and 34 transitions. [2021-11-20 23:36:29,972 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 3.0) 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) [2021-11-20 23:36:29,972 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 34 transitions. [2021-11-20 23:36:29,972 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2021-11-20 23:36:29,973 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:36:29,973 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:36:29,973 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2021-11-20 23:36:29,973 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 15 more)] === [2021-11-20 23:36:29,973 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:36:29,974 INFO L85 PathProgramCache]: Analyzing trace with hash 1400614514, now seen corresponding path program 1 times [2021-11-20 23:36:29,974 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:36:29,974 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [899164613] [2021-11-20 23:36:29,974 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:36:29,974 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:36:30,003 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:36:30,043 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:36:30,044 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:36:30,044 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [899164613] [2021-11-20 23:36:30,044 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [899164613] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:36:30,044 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 23:36:30,044 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-20 23:36:30,044 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1332433159] [2021-11-20 23:36:30,045 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:36:30,045 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-20 23:36:30,045 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:36:30,046 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-20 23:36:30,047 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-20 23:36:30,047 INFO L87 Difference]: Start difference. First operand 28 states and 34 transitions. Second operand has 5 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) [2021-11-20 23:36:30,125 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:36:30,125 INFO L93 Difference]: Finished difference Result 41 states and 50 transitions. [2021-11-20 23:36:30,125 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-20 23:36:30,126 INFO L78 Accepts]: Start accepts. Automaton has has 5 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 9 [2021-11-20 23:36:30,126 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:36:30,126 INFO L225 Difference]: With dead ends: 41 [2021-11-20 23:36:30,126 INFO L226 Difference]: Without dead ends: 41 [2021-11-20 23:36:30,127 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2021-11-20 23:36:30,127 INFO L933 BasicCegarLoop]: 13 mSDtfsCounter, 79 mSDsluCounter, 13 mSDsCounter, 0 mSdLazyCounter, 48 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 79 SdHoareTripleChecker+Valid, 23 SdHoareTripleChecker+Invalid, 52 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 48 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-20 23:36:30,128 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [79 Valid, 23 Invalid, 52 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 48 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-20 23:36:30,128 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2021-11-20 23:36:30,130 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 33. [2021-11-20 23:36:30,130 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 33 states, 27 states have (on average 1.5185185185185186) internal successors, (41), 32 states have internal predecessors, (41), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:36:30,131 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 41 transitions. [2021-11-20 23:36:30,131 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 41 transitions. Word has length 9 [2021-11-20 23:36:30,131 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:36:30,131 INFO L470 AbstractCegarLoop]: Abstraction has 33 states and 41 transitions. [2021-11-20 23:36:30,131 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 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) [2021-11-20 23:36:30,131 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 41 transitions. [2021-11-20 23:36:30,132 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2021-11-20 23:36:30,132 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:36:30,132 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:36:30,132 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2021-11-20 23:36:30,133 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr18ASSERT_VIOLATIONMEMORY_LEAK === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 15 more)] === [2021-11-20 23:36:30,133 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:36:30,133 INFO L85 PathProgramCache]: Analyzing trace with hash 469310905, now seen corresponding path program 1 times [2021-11-20 23:36:30,133 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:36:30,134 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1330064676] [2021-11-20 23:36:30,134 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:36:30,134 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:36:30,147 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:36:30,172 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:36:30,172 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:36:30,173 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1330064676] [2021-11-20 23:36:30,173 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1330064676] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:36:30,173 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 23:36:30,173 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-20 23:36:30,173 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [559955018] [2021-11-20 23:36:30,173 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:36:30,174 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-20 23:36:30,174 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:36:30,174 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-20 23:36:30,174 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-20 23:36:30,175 INFO L87 Difference]: Start difference. First operand 33 states and 41 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) [2021-11-20 23:36:30,197 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:36:30,197 INFO L93 Difference]: Finished difference Result 32 states and 40 transitions. [2021-11-20 23:36:30,198 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-20 23:36:30,198 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 10 [2021-11-20 23:36:30,198 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:36:30,199 INFO L225 Difference]: With dead ends: 32 [2021-11-20 23:36:30,199 INFO L226 Difference]: Without dead ends: 29 [2021-11-20 23:36:30,199 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-20 23:36:30,200 INFO L933 BasicCegarLoop]: 15 mSDtfsCounter, 20 mSDsluCounter, 18 mSDsCounter, 0 mSdLazyCounter, 28 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 20 SdHoareTripleChecker+Valid, 30 SdHoareTripleChecker+Invalid, 28 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 28 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-20 23:36:30,200 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [20 Valid, 30 Invalid, 28 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 28 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-20 23:36:30,201 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2021-11-20 23:36:30,202 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2021-11-20 23:36:30,202 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29 states, 24 states have (on average 1.4583333333333333) internal successors, (35), 28 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) [2021-11-20 23:36:30,202 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 35 transitions. [2021-11-20 23:36:30,203 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 35 transitions. Word has length 10 [2021-11-20 23:36:30,203 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:36:30,203 INFO L470 AbstractCegarLoop]: Abstraction has 29 states and 35 transitions. [2021-11-20 23:36:30,203 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) [2021-11-20 23:36:30,203 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 35 transitions. [2021-11-20 23:36:30,204 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-11-20 23:36:30,204 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:36:30,204 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:36:30,204 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2021-11-20 23:36:30,204 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 15 more)] === [2021-11-20 23:36:30,205 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:36:30,205 INFO L85 PathProgramCache]: Analyzing trace with hash 101075500, now seen corresponding path program 1 times [2021-11-20 23:36:30,205 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:36:30,205 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [294385712] [2021-11-20 23:36:30,205 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:36:30,206 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:36:30,213 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:36:30,225 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:36:30,225 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:36:30,225 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [294385712] [2021-11-20 23:36:30,225 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [294385712] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:36:30,226 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 23:36:30,226 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-20 23:36:30,226 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1521590830] [2021-11-20 23:36:30,226 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:36:30,226 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-20 23:36:30,227 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:36:30,227 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-20 23:36:30,227 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-20 23:36:30,227 INFO L87 Difference]: Start difference. First operand 29 states and 35 transitions. Second operand has 3 states, 3 states have (on average 4.0) internal successors, (12), 3 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:36:30,245 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:36:30,245 INFO L93 Difference]: Finished difference Result 31 states and 37 transitions. [2021-11-20 23:36:30,245 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-20 23:36:30,245 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 4.0) internal successors, (12), 3 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 12 [2021-11-20 23:36:30,246 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:36:30,246 INFO L225 Difference]: With dead ends: 31 [2021-11-20 23:36:30,246 INFO L226 Difference]: Without dead ends: 31 [2021-11-20 23:36:30,246 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-20 23:36:30,247 INFO L933 BasicCegarLoop]: 14 mSDtfsCounter, 0 mSDsluCounter, 18 mSDsCounter, 0 mSdLazyCounter, 24 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 25 SdHoareTripleChecker+Invalid, 24 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 24 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-20 23:36:30,248 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 25 Invalid, 24 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 24 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-20 23:36:30,248 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2021-11-20 23:36:30,249 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2021-11-20 23:36:30,250 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 31 states, 26 states have (on average 1.4230769230769231) internal successors, (37), 30 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) [2021-11-20 23:36:30,250 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 37 transitions. [2021-11-20 23:36:30,250 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 37 transitions. Word has length 12 [2021-11-20 23:36:30,250 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:36:30,250 INFO L470 AbstractCegarLoop]: Abstraction has 31 states and 37 transitions. [2021-11-20 23:36:30,251 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 4.0) internal successors, (12), 3 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:36:30,251 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 37 transitions. [2021-11-20 23:36:30,251 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2021-11-20 23:36:30,251 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:36:30,252 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:36:30,252 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2021-11-20 23:36:30,252 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 15 more)] === [2021-11-20 23:36:30,252 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:36:30,252 INFO L85 PathProgramCache]: Analyzing trace with hash -1161774215, now seen corresponding path program 1 times [2021-11-20 23:36:30,253 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:36:30,253 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1311306365] [2021-11-20 23:36:30,253 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:36:30,253 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:36:30,270 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:36:30,360 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-20 23:36:30,360 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:36:30,361 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1311306365] [2021-11-20 23:36:30,361 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1311306365] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:36:30,361 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 23:36:30,361 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-20 23:36:30,361 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2101898390] [2021-11-20 23:36:30,361 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:36:30,362 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-20 23:36:30,362 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:36:30,362 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-20 23:36:30,362 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-11-20 23:36:30,363 INFO L87 Difference]: Start difference. First operand 31 states and 37 transitions. Second operand has 7 states, 7 states have (on average 1.8571428571428572) internal successors, (13), 6 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) [2021-11-20 23:36:30,457 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:36:30,457 INFO L93 Difference]: Finished difference Result 39 states and 46 transitions. [2021-11-20 23:36:30,457 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-20 23:36:30,457 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 1.8571428571428572) internal successors, (13), 6 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 13 [2021-11-20 23:36:30,457 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:36:30,458 INFO L225 Difference]: With dead ends: 39 [2021-11-20 23:36:30,458 INFO L226 Difference]: Without dead ends: 33 [2021-11-20 23:36:30,458 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=33, Invalid=57, Unknown=0, NotChecked=0, Total=90 [2021-11-20 23:36:30,459 INFO L933 BasicCegarLoop]: 12 mSDtfsCounter, 13 mSDsluCounter, 57 mSDsCounter, 0 mSdLazyCounter, 71 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 13 SdHoareTripleChecker+Valid, 55 SdHoareTripleChecker+Invalid, 74 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 71 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-20 23:36:30,459 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [13 Valid, 55 Invalid, 74 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 71 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-20 23:36:30,459 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2021-11-20 23:36:30,460 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 32. [2021-11-20 23:36:30,461 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 27 states have (on average 1.4074074074074074) internal successors, (38), 31 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:36:30,461 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 38 transitions. [2021-11-20 23:36:30,461 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 38 transitions. Word has length 13 [2021-11-20 23:36:30,461 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:36:30,461 INFO L470 AbstractCegarLoop]: Abstraction has 32 states and 38 transitions. [2021-11-20 23:36:30,462 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 1.8571428571428572) internal successors, (13), 6 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) [2021-11-20 23:36:30,462 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 38 transitions. [2021-11-20 23:36:30,462 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-11-20 23:36:30,462 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:36:30,462 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:36:30,462 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2021-11-20 23:36:30,463 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 15 more)] === [2021-11-20 23:36:30,463 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:36:30,463 INFO L85 PathProgramCache]: Analyzing trace with hash -1481271869, now seen corresponding path program 1 times [2021-11-20 23:36:30,463 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:36:30,463 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1010934362] [2021-11-20 23:36:30,463 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:36:30,463 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:36:30,477 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:36:30,543 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-20 23:36:30,544 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:36:30,544 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1010934362] [2021-11-20 23:36:30,544 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1010934362] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:36:30,544 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 23:36:30,544 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2021-11-20 23:36:30,544 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [162831514] [2021-11-20 23:36:30,545 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:36:30,545 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-20 23:36:30,545 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:36:30,546 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-20 23:36:30,546 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=41, Unknown=0, NotChecked=0, Total=56 [2021-11-20 23:36:30,546 INFO L87 Difference]: Start difference. First operand 32 states and 38 transitions. Second operand has 8 states, 8 states have (on average 1.875) internal successors, (15), 7 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:36:30,671 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:36:30,671 INFO L93 Difference]: Finished difference Result 49 states and 56 transitions. [2021-11-20 23:36:30,671 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-20 23:36:30,672 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 1.875) internal successors, (15), 7 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 15 [2021-11-20 23:36:30,672 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:36:30,672 INFO L225 Difference]: With dead ends: 49 [2021-11-20 23:36:30,672 INFO L226 Difference]: Without dead ends: 49 [2021-11-20 23:36:30,673 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=52, Invalid=104, Unknown=0, NotChecked=0, Total=156 [2021-11-20 23:36:30,673 INFO L933 BasicCegarLoop]: 9 mSDtfsCounter, 61 mSDsluCounter, 68 mSDsCounter, 0 mSdLazyCounter, 96 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 61 SdHoareTripleChecker+Valid, 56 SdHoareTripleChecker+Invalid, 103 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 96 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-20 23:36:30,673 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [61 Valid, 56 Invalid, 103 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 96 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-20 23:36:30,674 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49 states. [2021-11-20 23:36:30,676 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49 to 46. [2021-11-20 23:36:30,676 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 46 states, 41 states have (on average 1.3414634146341464) internal successors, (55), 45 states have internal predecessors, (55), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:36:30,676 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 46 states to 46 states and 55 transitions. [2021-11-20 23:36:30,676 INFO L78 Accepts]: Start accepts. Automaton has 46 states and 55 transitions. Word has length 15 [2021-11-20 23:36:30,677 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:36:30,677 INFO L470 AbstractCegarLoop]: Abstraction has 46 states and 55 transitions. [2021-11-20 23:36:30,677 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 1.875) internal successors, (15), 7 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:36:30,677 INFO L276 IsEmpty]: Start isEmpty. Operand 46 states and 55 transitions. [2021-11-20 23:36:30,677 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2021-11-20 23:36:30,677 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:36:30,678 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:36:30,685 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2021-11-20 23:36:30,686 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 15 more)] === [2021-11-20 23:36:30,686 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:36:30,686 INFO L85 PathProgramCache]: Analyzing trace with hash 1329745851, now seen corresponding path program 1 times [2021-11-20 23:36:30,686 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:36:30,687 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1342890311] [2021-11-20 23:36:30,687 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:36:30,687 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:36:30,695 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:36:30,753 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-20 23:36:30,753 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:36:30,753 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1342890311] [2021-11-20 23:36:30,753 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1342890311] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:36:30,754 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 23:36:30,754 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2021-11-20 23:36:30,754 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [959395907] [2021-11-20 23:36:30,754 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:36:30,755 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-20 23:36:30,755 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:36:30,755 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-20 23:36:30,756 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2021-11-20 23:36:30,756 INFO L87 Difference]: Start difference. First operand 46 states and 55 transitions. Second operand has 8 states, 8 states have (on average 2.0) internal successors, (16), 8 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:36:30,862 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:36:30,862 INFO L93 Difference]: Finished difference Result 47 states and 52 transitions. [2021-11-20 23:36:30,862 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-11-20 23:36:30,863 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 2.0) internal successors, (16), 8 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 16 [2021-11-20 23:36:30,863 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:36:30,863 INFO L225 Difference]: With dead ends: 47 [2021-11-20 23:36:30,863 INFO L226 Difference]: Without dead ends: 34 [2021-11-20 23:36:30,863 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=46, Invalid=110, Unknown=0, NotChecked=0, Total=156 [2021-11-20 23:36:30,864 INFO L933 BasicCegarLoop]: 9 mSDtfsCounter, 35 mSDsluCounter, 49 mSDsCounter, 0 mSdLazyCounter, 121 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 35 SdHoareTripleChecker+Valid, 36 SdHoareTripleChecker+Invalid, 125 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 121 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-20 23:36:30,864 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [35 Valid, 36 Invalid, 125 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 121 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-20 23:36:30,864 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2021-11-20 23:36:30,865 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 33. [2021-11-20 23:36:30,865 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 33 states, 28 states have (on average 1.3571428571428572) internal successors, (38), 32 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:36:30,865 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 38 transitions. [2021-11-20 23:36:30,865 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 38 transitions. Word has length 16 [2021-11-20 23:36:30,866 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:36:30,866 INFO L470 AbstractCegarLoop]: Abstraction has 33 states and 38 transitions. [2021-11-20 23:36:30,866 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 2.0) internal successors, (16), 8 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:36:30,866 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 38 transitions. [2021-11-20 23:36:30,866 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2021-11-20 23:36:30,866 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:36:30,866 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:36:30,867 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2021-11-20 23:36:30,867 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 15 more)] === [2021-11-20 23:36:30,867 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:36:30,867 INFO L85 PathProgramCache]: Analyzing trace with hash -298912303, now seen corresponding path program 1 times [2021-11-20 23:36:30,867 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:36:30,867 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1553420251] [2021-11-20 23:36:30,867 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:36:30,867 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:36:30,885 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:36:30,991 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-20 23:36:30,991 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:36:30,992 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1553420251] [2021-11-20 23:36:30,992 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1553420251] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:36:30,992 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [778451661] [2021-11-20 23:36:30,992 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:36:30,992 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:36:30,992 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a0d2f8-3e8e-41d4-891b-65088d0c913e/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:36:30,993 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a0d2f8-3e8e-41d4-891b-65088d0c913e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:36:31,013 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a0d2f8-3e8e-41d4-891b-65088d0c913e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-20 23:36:31,050 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:36:31,051 INFO L263 TraceCheckSpWp]: Trace formula consists of 132 conjuncts, 20 conjunts are in the unsatisfiable core [2021-11-20 23:36:31,053 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:36:31,175 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-20 23:36:31,175 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:36:31,287 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 5 treesize of output 3 [2021-11-20 23:36:31,313 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-20 23:36:31,313 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [778451661] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:36:31,313 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1838241230] [2021-11-20 23:36:31,316 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-20 23:36:31,316 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:36:31,316 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:36:31,316 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:36:31,317 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:36:31,347 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:31,348 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-20 23:36:31,642 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 16 [2021-11-20 23:36:31,945 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-20 23:36:31,945 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 194 treesize of output 193 [2021-11-20 23:36:32,706 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:36:32,946 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:36:33,749 INFO L354 Elim1Store]: treesize reduction 22, result has 50.0 percent of original size [2021-11-20 23:36:33,750 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 198 treesize of output 202 [2021-11-20 23:36:34,495 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:36:34,773 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:36:34,912 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 14 treesize of output 10 [2021-11-20 23:36:35,024 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-20 23:36:35,025 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2021-11-20 23:36:39,075 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:36:40,781 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:36:40,781 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:36:40,781 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 17 [2021-11-20 23:36:40,782 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2122450489] [2021-11-20 23:36:40,782 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:36:40,782 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2021-11-20 23:36:40,782 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:36:40,782 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2021-11-20 23:36:40,783 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=128, Invalid=864, Unknown=0, NotChecked=0, Total=992 [2021-11-20 23:36:40,783 INFO L87 Difference]: Start difference. First operand 33 states and 38 transitions. Second operand has 18 states, 17 states have (on average 2.4705882352941178) internal successors, (42), 18 states have internal predecessors, (42), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:36:41,021 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:36:41,022 INFO L93 Difference]: Finished difference Result 47 states and 52 transitions. [2021-11-20 23:36:41,022 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-11-20 23:36:41,022 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 17 states have (on average 2.4705882352941178) internal successors, (42), 18 states have internal predecessors, (42), 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 17 [2021-11-20 23:36:41,022 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:36:41,023 INFO L225 Difference]: With dead ends: 47 [2021-11-20 23:36:41,023 INFO L226 Difference]: Without dead ends: 43 [2021-11-20 23:36:41,024 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 24 SyntacticMatches, 2 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 409 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=189, Invalid=1143, Unknown=0, NotChecked=0, Total=1332 [2021-11-20 23:36:41,025 INFO L933 BasicCegarLoop]: 6 mSDtfsCounter, 163 mSDsluCounter, 39 mSDsCounter, 0 mSdLazyCounter, 159 mSolverCounterSat, 23 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 163 SdHoareTripleChecker+Valid, 32 SdHoareTripleChecker+Invalid, 182 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 23 IncrementalHoareTripleChecker+Valid, 159 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-20 23:36:41,026 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [163 Valid, 32 Invalid, 182 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [23 Valid, 159 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-20 23:36:41,027 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2021-11-20 23:36:41,027 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 29. [2021-11-20 23:36:41,028 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29 states, 26 states have (on average 1.2692307692307692) 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) [2021-11-20 23:36:41,028 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 33 transitions. [2021-11-20 23:36:41,028 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 33 transitions. Word has length 17 [2021-11-20 23:36:41,028 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:36:41,028 INFO L470 AbstractCegarLoop]: Abstraction has 29 states and 33 transitions. [2021-11-20 23:36:41,029 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 17 states have (on average 2.4705882352941178) internal successors, (42), 18 states have internal predecessors, (42), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:36:41,029 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 33 transitions. [2021-11-20 23:36:41,029 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2021-11-20 23:36:41,029 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:36:41,030 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:36:41,065 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a0d2f8-3e8e-41d4-891b-65088d0c913e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-20 23:36:41,244 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a0d2f8-3e8e-41d4-891b-65088d0c913e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2021-11-20 23:36:41,245 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 15 more)] === [2021-11-20 23:36:41,245 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:36:41,245 INFO L85 PathProgramCache]: Analyzing trace with hash 508049194, now seen corresponding path program 1 times [2021-11-20 23:36:41,245 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:36:41,245 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1649390673] [2021-11-20 23:36:41,246 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:36:41,246 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:36:41,263 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:36:41,347 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-20 23:36:41,348 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:36:41,348 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1649390673] [2021-11-20 23:36:41,348 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1649390673] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:36:41,348 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [532919307] [2021-11-20 23:36:41,348 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:36:41,349 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:36:41,349 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a0d2f8-3e8e-41d4-891b-65088d0c913e/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:36:41,363 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a0d2f8-3e8e-41d4-891b-65088d0c913e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:36:41,387 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a0d2f8-3e8e-41d4-891b-65088d0c913e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-20 23:36:41,448 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:36:41,450 INFO L263 TraceCheckSpWp]: Trace formula consists of 140 conjuncts, 26 conjunts are in the unsatisfiable core [2021-11-20 23:36:41,452 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:36:41,470 INFO L354 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2021-11-20 23:36:41,471 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 1 case distinctions, treesize of input 18 treesize of output 19 [2021-11-20 23:36:41,474 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 13 [2021-11-20 23:36:41,612 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-20 23:36:41,612 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:36:41,822 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-20 23:36:41,822 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [532919307] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:36:41,822 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [355774423] [2021-11-20 23:36:41,825 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2021-11-20 23:36:41,825 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:36:41,826 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:36:41,826 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:36:41,826 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:36:41,943 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:41,945 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-20 23:36:42,168 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:36:42,394 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:42,396 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 200 treesize of output 192 [2021-11-20 23:36:42,929 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:36:43,154 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:36:43,793 INFO L354 Elim1Store]: treesize reduction 22, result has 50.0 percent of original size [2021-11-20 23:36:43,794 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 198 treesize of output 202 [2021-11-20 23:36:44,734 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:36:44,919 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:36:45,088 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 14 treesize of output 10 [2021-11-20 23:36:45,257 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-20 23:36:45,258 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2021-11-20 23:36:52,150 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:36:54,300 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:36:54,301 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:36:54,301 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5, 5] total 15 [2021-11-20 23:36:54,303 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1149615461] [2021-11-20 23:36:54,303 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:36:54,306 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2021-11-20 23:36:54,306 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:36:54,307 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-11-20 23:36:54,307 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=120, Invalid=872, Unknown=0, NotChecked=0, Total=992 [2021-11-20 23:36:54,308 INFO L87 Difference]: Start difference. First operand 29 states and 33 transitions. Second operand has 17 states, 16 states have (on average 3.125) internal successors, (50), 16 states have internal predecessors, (50), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:36:54,525 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:36:54,526 INFO L93 Difference]: Finished difference Result 56 states and 64 transitions. [2021-11-20 23:36:54,526 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-20 23:36:54,526 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 16 states have (on average 3.125) internal successors, (50), 16 states have internal predecessors, (50), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 19 [2021-11-20 23:36:54,527 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:36:54,527 INFO L225 Difference]: With dead ends: 56 [2021-11-20 23:36:54,527 INFO L226 Difference]: Without dead ends: 56 [2021-11-20 23:36:54,528 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 30 SyntacticMatches, 1 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 315 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=183, Invalid=1223, Unknown=0, NotChecked=0, Total=1406 [2021-11-20 23:36:54,529 INFO L933 BasicCegarLoop]: 9 mSDtfsCounter, 168 mSDsluCounter, 34 mSDsCounter, 0 mSdLazyCounter, 116 mSolverCounterSat, 21 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 168 SdHoareTripleChecker+Valid, 38 SdHoareTripleChecker+Invalid, 137 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 21 IncrementalHoareTripleChecker+Valid, 116 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-20 23:36:54,530 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [168 Valid, 38 Invalid, 137 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [21 Valid, 116 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-20 23:36:54,530 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 56 states. [2021-11-20 23:36:54,540 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 56 to 40. [2021-11-20 23:36:54,540 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40 states, 38 states have (on average 1.236842105263158) internal successors, (47), 39 states have internal predecessors, (47), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:36:54,541 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 47 transitions. [2021-11-20 23:36:54,542 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 47 transitions. Word has length 19 [2021-11-20 23:36:54,542 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:36:54,543 INFO L470 AbstractCegarLoop]: Abstraction has 40 states and 47 transitions. [2021-11-20 23:36:54,543 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 16 states have (on average 3.125) internal successors, (50), 16 states have internal predecessors, (50), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:36:54,543 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 47 transitions. [2021-11-20 23:36:54,544 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2021-11-20 23:36:54,544 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:36:54,544 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:36:54,581 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a0d2f8-3e8e-41d4-891b-65088d0c913e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-20 23:36:54,759 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a0d2f8-3e8e-41d4-891b-65088d0c913e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:36:54,759 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 15 more)] === [2021-11-20 23:36:54,759 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:36:54,760 INFO L85 PathProgramCache]: Analyzing trace with hash -1313653928, now seen corresponding path program 2 times [2021-11-20 23:36:54,760 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:36:54,760 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [566499352] [2021-11-20 23:36:54,760 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:36:54,760 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:36:54,772 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:36:54,938 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 4 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-20 23:36:54,938 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:36:54,938 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [566499352] [2021-11-20 23:36:54,938 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [566499352] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:36:54,938 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1211555220] [2021-11-20 23:36:54,938 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-20 23:36:54,939 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:36:54,939 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a0d2f8-3e8e-41d4-891b-65088d0c913e/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:36:54,941 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a0d2f8-3e8e-41d4-891b-65088d0c913e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:36:54,942 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a0d2f8-3e8e-41d4-891b-65088d0c913e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-20 23:36:55,004 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-11-20 23:36:55,004 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:36:55,005 INFO L263 TraceCheckSpWp]: Trace formula consists of 152 conjuncts, 30 conjunts are in the unsatisfiable core [2021-11-20 23:36:55,007 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:36:55,087 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-11-20 23:36:55,337 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 4 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-20 23:36:55,337 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:36:55,427 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 13 [2021-11-20 23:36:55,429 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 22 [2021-11-20 23:36:55,543 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 4 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-20 23:36:55,543 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1211555220] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:36:55,543 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2059362560] [2021-11-20 23:36:55,546 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-20 23:36:55,546 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:36:55,547 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:36:55,547 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:36:55,547 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:36:55,663 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:36:55,665 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-20 23:36:55,868 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 16 [2021-11-20 23:36:56,136 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-20 23:36:56,137 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 194 treesize of output 193 [2021-11-20 23:36:56,834 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:36:56,986 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:36:57,718 INFO L354 Elim1Store]: treesize reduction 28, result has 44.0 percent of original size [2021-11-20 23:36:57,719 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 204 treesize of output 208 [2021-11-20 23:36:58,442 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:36:58,648 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:36:58,888 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 14 treesize of output 10 [2021-11-20 23:36:58,997 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-20 23:36:58,997 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2021-11-20 23:37:02,704 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:37:04,590 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:37:04,590 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:37:04,590 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10] total 25 [2021-11-20 23:37:04,590 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [405779882] [2021-11-20 23:37:04,590 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:37:04,591 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2021-11-20 23:37:04,591 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:37:04,591 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-11-20 23:37:04,592 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=154, Invalid=1328, Unknown=0, NotChecked=0, Total=1482 [2021-11-20 23:37:04,593 INFO L87 Difference]: Start difference. First operand 40 states and 47 transitions. Second operand has 25 states, 25 states have (on average 2.08) internal successors, (52), 25 states have internal predecessors, (52), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:37:04,903 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:37:04,903 INFO L93 Difference]: Finished difference Result 69 states and 77 transitions. [2021-11-20 23:37:04,904 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-20 23:37:04,904 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 2.08) internal successors, (52), 25 states have internal predecessors, (52), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2021-11-20 23:37:04,904 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:37:04,904 INFO L225 Difference]: With dead ends: 69 [2021-11-20 23:37:04,904 INFO L226 Difference]: Without dead ends: 65 [2021-11-20 23:37:04,906 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 81 GetRequests, 33 SyntacticMatches, 2 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 3 DeprecatedPredicates, 670 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=276, Invalid=1980, Unknown=0, NotChecked=0, Total=2256 [2021-11-20 23:37:04,906 INFO L933 BasicCegarLoop]: 6 mSDtfsCounter, 107 mSDsluCounter, 116 mSDsCounter, 0 mSdLazyCounter, 145 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 107 SdHoareTripleChecker+Valid, 79 SdHoareTripleChecker+Invalid, 197 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 145 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 39 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-20 23:37:04,907 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [107 Valid, 79 Invalid, 197 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 145 Invalid, 0 Unknown, 39 Unchecked, 0.1s Time] [2021-11-20 23:37:04,907 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2021-11-20 23:37:04,909 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 63. [2021-11-20 23:37:04,909 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 63 states, 61 states have (on average 1.180327868852459) internal successors, (72), 62 states have internal predecessors, (72), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:37:04,910 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 72 transitions. [2021-11-20 23:37:04,910 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 72 transitions. Word has length 21 [2021-11-20 23:37:04,910 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:37:04,910 INFO L470 AbstractCegarLoop]: Abstraction has 63 states and 72 transitions. [2021-11-20 23:37:04,911 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 25 states have (on average 2.08) internal successors, (52), 25 states have internal predecessors, (52), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:37:04,911 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 72 transitions. [2021-11-20 23:37:04,911 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2021-11-20 23:37:04,912 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:37:04,912 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:37:04,948 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a0d2f8-3e8e-41d4-891b-65088d0c913e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Ended with exit code 0 [2021-11-20 23:37:05,127 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a0d2f8-3e8e-41d4-891b-65088d0c913e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:37:05,127 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 15 more)] === [2021-11-20 23:37:05,128 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:37:05,128 INFO L85 PathProgramCache]: Analyzing trace with hash -1271146266, now seen corresponding path program 3 times [2021-11-20 23:37:05,128 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:37:05,128 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [865976730] [2021-11-20 23:37:05,128 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:37:05,128 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:37:05,139 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:37:05,289 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-20 23:37:05,289 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:37:05,289 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [865976730] [2021-11-20 23:37:05,290 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [865976730] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:37:05,290 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1649150870] [2021-11-20 23:37:05,290 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-20 23:37:05,290 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:37:05,290 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a0d2f8-3e8e-41d4-891b-65088d0c913e/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:37:05,291 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a0d2f8-3e8e-41d4-891b-65088d0c913e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:37:05,291 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a0d2f8-3e8e-41d4-891b-65088d0c913e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-20 23:37:05,357 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-20 23:37:05,357 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:37:05,359 INFO L263 TraceCheckSpWp]: Trace formula consists of 162 conjuncts, 27 conjunts are in the unsatisfiable core [2021-11-20 23:37:05,361 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:37:05,376 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-20 23:37:05,376 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 1 case distinctions, treesize of input 9 treesize of output 15 [2021-11-20 23:37:05,605 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 1 proven. 9 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-20 23:37:05,606 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:37:05,850 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 4 proven. 6 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-20 23:37:05,850 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1649150870] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:37:05,850 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1702607348] [2021-11-20 23:37:05,852 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-20 23:37:05,852 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:37:05,853 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:37:05,853 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:37:05,853 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:37:05,932 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:37:05,936 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-20 23:37:06,098 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 16 [2021-11-20 23:37:06,329 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-20 23:37:06,330 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 194 treesize of output 193 [2021-11-20 23:37:06,888 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:37:07,108 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:37:07,966 INFO L354 Elim1Store]: treesize reduction 28, result has 44.0 percent of original size [2021-11-20 23:37:07,967 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 204 treesize of output 208 [2021-11-20 23:37:08,726 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:37:08,916 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:37:09,056 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 14 treesize of output 10 [2021-11-20 23:37:09,240 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-20 23:37:09,240 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2021-11-20 23:37:12,846 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:37:14,823 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:37:14,823 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:37:14,823 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 9, 9] total 25 [2021-11-20 23:37:14,824 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2041494044] [2021-11-20 23:37:14,824 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:37:14,824 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2021-11-20 23:37:14,824 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:37:14,825 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2021-11-20 23:37:14,825 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=178, Invalid=1462, Unknown=0, NotChecked=0, Total=1640 [2021-11-20 23:37:14,826 INFO L87 Difference]: Start difference. First operand 63 states and 72 transitions. Second operand has 27 states, 26 states have (on average 2.576923076923077) internal successors, (67), 26 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:37:15,240 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:37:15,240 INFO L93 Difference]: Finished difference Result 102 states and 114 transitions. [2021-11-20 23:37:15,240 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-20 23:37:15,241 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 26 states have (on average 2.576923076923077) internal successors, (67), 26 states have internal predecessors, (67), 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 23 [2021-11-20 23:37:15,241 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:37:15,243 INFO L225 Difference]: With dead ends: 102 [2021-11-20 23:37:15,243 INFO L226 Difference]: Without dead ends: 102 [2021-11-20 23:37:15,244 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 35 SyntacticMatches, 1 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 663 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=312, Invalid=1944, Unknown=0, NotChecked=0, Total=2256 [2021-11-20 23:37:15,245 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 178 mSDsluCounter, 91 mSDsCounter, 0 mSdLazyCounter, 392 mSolverCounterSat, 30 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 178 SdHoareTripleChecker+Valid, 71 SdHoareTripleChecker+Invalid, 422 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 30 IncrementalHoareTripleChecker+Valid, 392 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-20 23:37:15,246 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [178 Valid, 71 Invalid, 422 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [30 Valid, 392 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-20 23:37:15,246 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 102 states. [2021-11-20 23:37:15,250 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 102 to 71. [2021-11-20 23:37:15,250 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 71 states, 69 states have (on average 1.1884057971014492) internal successors, (82), 70 states have internal predecessors, (82), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:37:15,251 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 82 transitions. [2021-11-20 23:37:15,251 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 82 transitions. Word has length 23 [2021-11-20 23:37:15,251 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:37:15,252 INFO L470 AbstractCegarLoop]: Abstraction has 71 states and 82 transitions. [2021-11-20 23:37:15,252 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 26 states have (on average 2.576923076923077) internal successors, (67), 26 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:37:15,252 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 82 transitions. [2021-11-20 23:37:15,253 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2021-11-20 23:37:15,253 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:37:15,253 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:37:15,294 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a0d2f8-3e8e-41d4-891b-65088d0c913e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-20 23:37:15,454 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a0d2f8-3e8e-41d4-891b-65088d0c913e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:37:15,454 INFO L402 AbstractCegarLoop]: === Iteration 22 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 15 more)] === [2021-11-20 23:37:15,454 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:37:15,454 INFO L85 PathProgramCache]: Analyzing trace with hash 297700333, now seen corresponding path program 4 times [2021-11-20 23:37:15,454 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:37:15,455 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1106438059] [2021-11-20 23:37:15,455 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:37:15,455 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:37:15,478 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:37:15,744 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 7 proven. 13 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:37:15,744 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:37:15,744 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1106438059] [2021-11-20 23:37:15,745 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1106438059] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:37:15,745 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1358984835] [2021-11-20 23:37:15,745 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-20 23:37:15,745 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:37:15,745 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a0d2f8-3e8e-41d4-891b-65088d0c913e/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:37:15,748 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a0d2f8-3e8e-41d4-891b-65088d0c913e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:37:15,749 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a0d2f8-3e8e-41d4-891b-65088d0c913e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-20 23:37:15,805 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:37:15,806 INFO L263 TraceCheckSpWp]: Trace formula consists of 182 conjuncts, 34 conjunts are in the unsatisfiable core [2021-11-20 23:37:15,809 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:37:15,916 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-11-20 23:37:16,098 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 7 proven. 12 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-20 23:37:16,099 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:37:16,171 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 13 [2021-11-20 23:37:16,174 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 22 [2021-11-20 23:37:16,280 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 7 proven. 12 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-20 23:37:16,280 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1358984835] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:37:16,280 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [887208081] [2021-11-20 23:37:16,282 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-20 23:37:16,283 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:37:16,283 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:37:16,284 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:37:16,284 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:37:16,355 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:37:16,356 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-20 23:37:16,550 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 16 [2021-11-20 23:37:16,821 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-20 23:37:16,821 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 194 treesize of output 193 [2021-11-20 23:37:17,471 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:37:17,672 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:37:18,522 INFO L354 Elim1Store]: treesize reduction 22, result has 50.0 percent of original size [2021-11-20 23:37:18,522 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 198 treesize of output 202 [2021-11-20 23:37:19,471 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:37:19,748 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:37:19,896 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 14 treesize of output 10 [2021-11-20 23:37:20,034 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-20 23:37:20,035 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2021-11-20 23:37:24,316 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:37:26,312 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:37:26,312 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:37:26,313 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 12, 12] total 26 [2021-11-20 23:37:26,313 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [85946297] [2021-11-20 23:37:26,313 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:37:26,313 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2021-11-20 23:37:26,314 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:37:26,314 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-11-20 23:37:26,315 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=138, Invalid=1422, Unknown=0, NotChecked=0, Total=1560 [2021-11-20 23:37:26,315 INFO L87 Difference]: Start difference. First operand 71 states and 82 transitions. Second operand has 26 states, 26 states have (on average 2.1538461538461537) internal successors, (56), 26 states have internal predecessors, (56), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:37:27,231 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:37:27,232 INFO L93 Difference]: Finished difference Result 253 states and 282 transitions. [2021-11-20 23:37:27,235 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2021-11-20 23:37:27,235 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 2.1538461538461537) internal successors, (56), 26 states have internal predecessors, (56), 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 27 [2021-11-20 23:37:27,235 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:37:27,236 INFO L225 Difference]: With dead ends: 253 [2021-11-20 23:37:27,237 INFO L226 Difference]: Without dead ends: 245 [2021-11-20 23:37:27,238 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 113 GetRequests, 53 SyntacticMatches, 3 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 2 DeprecatedPredicates, 897 ImplicationChecksByTransitivity, 2.9s TimeCoverageRelationStatistics Valid=344, Invalid=3078, Unknown=0, NotChecked=0, Total=3422 [2021-11-20 23:37:27,238 INFO L933 BasicCegarLoop]: 15 mSDtfsCounter, 293 mSDsluCounter, 243 mSDsCounter, 0 mSdLazyCounter, 427 mSolverCounterSat, 26 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 293 SdHoareTripleChecker+Valid, 185 SdHoareTripleChecker+Invalid, 612 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 26 IncrementalHoareTripleChecker+Valid, 427 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 159 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-20 23:37:27,240 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [293 Valid, 185 Invalid, 612 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [26 Valid, 427 Invalid, 0 Unknown, 159 Unchecked, 0.3s Time] [2021-11-20 23:37:27,241 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 245 states. [2021-11-20 23:37:27,248 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 245 to 102. [2021-11-20 23:37:27,250 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 102 states, 100 states have (on average 1.17) internal successors, (117), 101 states have internal predecessors, (117), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:37:27,250 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 102 states to 102 states and 117 transitions. [2021-11-20 23:37:27,251 INFO L78 Accepts]: Start accepts. Automaton has 102 states and 117 transitions. Word has length 27 [2021-11-20 23:37:27,251 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:37:27,251 INFO L470 AbstractCegarLoop]: Abstraction has 102 states and 117 transitions. [2021-11-20 23:37:27,251 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 26 states have (on average 2.1538461538461537) internal successors, (56), 26 states have internal predecessors, (56), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:37:27,251 INFO L276 IsEmpty]: Start isEmpty. Operand 102 states and 117 transitions. [2021-11-20 23:37:27,255 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-11-20 23:37:27,258 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:37:27,258 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:37:27,296 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a0d2f8-3e8e-41d4-891b-65088d0c913e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-11-20 23:37:27,471 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a0d2f8-3e8e-41d4-891b-65088d0c913e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:37:27,471 INFO L402 AbstractCegarLoop]: === Iteration 23 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 15 more)] === [2021-11-20 23:37:27,471 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:37:27,471 INFO L85 PathProgramCache]: Analyzing trace with hash 1136510355, now seen corresponding path program 2 times [2021-11-20 23:37:27,472 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:37:27,472 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1685756659] [2021-11-20 23:37:27,472 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:37:27,472 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:37:27,490 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:37:27,680 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 9 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-20 23:37:27,680 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:37:27,680 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1685756659] [2021-11-20 23:37:27,680 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1685756659] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:37:27,680 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1513013110] [2021-11-20 23:37:27,680 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-20 23:37:27,680 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:37:27,680 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a0d2f8-3e8e-41d4-891b-65088d0c913e/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:37:27,681 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a0d2f8-3e8e-41d4-891b-65088d0c913e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:37:27,682 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a0d2f8-3e8e-41d4-891b-65088d0c913e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-11-20 23:37:27,752 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-11-20 23:37:27,752 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:37:27,754 INFO L263 TraceCheckSpWp]: Trace formula consists of 185 conjuncts, 39 conjunts are in the unsatisfiable core [2021-11-20 23:37:27,756 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:37:27,764 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-11-20 23:37:27,855 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-11-20 23:37:27,908 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-20 23:37:27,908 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 35 treesize of output 34 [2021-11-20 23:37:28,861 INFO L354 Elim1Store]: treesize reduction 61, result has 29.9 percent of original size [2021-11-20 23:37:28,862 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 53 treesize of output 52 [2021-11-20 23:37:28,896 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 2 proven. 10 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-20 23:37:28,897 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:37:31,494 WARN L838 $PredicateComparison]: unable to prove that (forall ((|ULTIMATE.start_cstrpbrk_~s~0#1.offset| Int) (|ULTIMATE.start_main_~nondetString2~0#1.offset| Int) (|ULTIMATE.start_main_~length2~0#1| Int) (|ULTIMATE.start_cstrpbrk_~s~0#1.base| Int)) (let ((.cse1 (store |c_#memory_int| |c_ULTIMATE.start_main_~nondetString2~0#1.base| (store (select |c_#memory_int| |c_ULTIMATE.start_main_~nondetString2~0#1.base|) (+ (- 1) |ULTIMATE.start_main_~nondetString2~0#1.offset| |ULTIMATE.start_main_~length2~0#1|) 0)))) (let ((.cse0 (select (select .cse1 |ULTIMATE.start_cstrpbrk_~s~0#1.base|) |ULTIMATE.start_cstrpbrk_~s~0#1.offset|))) (or (= .cse0 0) (not (= .cse0 (select (select .cse1 |c_ULTIMATE.start_main_~nondetString1~0#1.base|) (+ |c_ULTIMATE.start_main_~nondetString1~0#1.offset| 1)))))))) is different from false [2021-11-20 23:37:31,505 INFO L354 Elim1Store]: treesize reduction 12, result has 7.7 percent of original size [2021-11-20 23:37:31,505 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 415 treesize of output 371 [2021-11-20 23:37:31,718 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 2 proven. 10 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-20 23:37:31,718 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1513013110] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:37:31,718 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1646494444] [2021-11-20 23:37:31,721 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2021-11-20 23:37:31,721 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:37:31,721 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:37:31,721 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:37:31,721 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:37:31,854 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:37:31,856 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-20 23:37:32,023 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 16 [2021-11-20 23:37:32,341 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-20 23:37:32,342 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 194 treesize of output 193 [2021-11-20 23:37:33,197 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:37:33,424 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:37:34,144 INFO L354 Elim1Store]: treesize reduction 28, result has 44.0 percent of original size [2021-11-20 23:37:34,145 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 204 treesize of output 208 [2021-11-20 23:37:35,047 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:37:35,215 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:37:35,406 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 14 treesize of output 10 [2021-11-20 23:37:35,596 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-20 23:37:35,596 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2021-11-20 23:37:42,952 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:37:46,161 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:37:46,162 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:37:46,162 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 12, 12] total 31 [2021-11-20 23:37:46,162 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1538445450] [2021-11-20 23:37:46,162 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:37:46,162 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2021-11-20 23:37:46,162 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:37:46,163 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2021-11-20 23:37:46,163 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=166, Invalid=1905, Unknown=3, NotChecked=88, Total=2162 [2021-11-20 23:37:46,164 INFO L87 Difference]: Start difference. First operand 102 states and 117 transitions. Second operand has 32 states, 32 states have (on average 2.5625) internal successors, (82), 31 states have internal predecessors, (82), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:38:06,046 WARN L227 SmtUtils]: Spent 19.68s on a formula simplification. DAG size of input: 38 DAG size of output: 35 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-20 23:38:06,199 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:38:06,200 INFO L93 Difference]: Finished difference Result 165 states and 185 transitions. [2021-11-20 23:38:06,200 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-20 23:38:06,200 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 2.5625) internal successors, (82), 31 states have internal predecessors, (82), 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 [2021-11-20 23:38:06,200 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:38:06,201 INFO L225 Difference]: With dead ends: 165 [2021-11-20 23:38:06,201 INFO L226 Difference]: Without dead ends: 131 [2021-11-20 23:38:06,202 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 100 GetRequests, 47 SyntacticMatches, 0 SemanticMatches, 53 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 681 ImplicationChecksByTransitivity, 26.1s TimeCoverageRelationStatistics Valid=229, Invalid=2634, Unknown=3, NotChecked=104, Total=2970 [2021-11-20 23:38:06,203 INFO L933 BasicCegarLoop]: 7 mSDtfsCounter, 21 mSDsluCounter, 147 mSDsCounter, 0 mSdLazyCounter, 107 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 21 SdHoareTripleChecker+Valid, 124 SdHoareTripleChecker+Invalid, 182 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 107 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 71 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-20 23:38:06,203 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [21 Valid, 124 Invalid, 182 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 107 Invalid, 0 Unknown, 71 Unchecked, 0.1s Time] [2021-11-20 23:38:06,204 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 131 states. [2021-11-20 23:38:06,206 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 131 to 129. [2021-11-20 23:38:06,206 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 129 states, 127 states have (on average 1.1574803149606299) internal successors, (147), 128 states have internal predecessors, (147), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:38:06,207 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 129 states to 129 states and 147 transitions. [2021-11-20 23:38:06,207 INFO L78 Accepts]: Start accepts. Automaton has 129 states and 147 transitions. Word has length 28 [2021-11-20 23:38:06,207 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:38:06,208 INFO L470 AbstractCegarLoop]: Abstraction has 129 states and 147 transitions. [2021-11-20 23:38:06,208 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 32 states have (on average 2.5625) internal successors, (82), 31 states have internal predecessors, (82), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:38:06,208 INFO L276 IsEmpty]: Start isEmpty. Operand 129 states and 147 transitions. [2021-11-20 23:38:06,209 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-11-20 23:38:06,209 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:38:06,209 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:38:06,246 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a0d2f8-3e8e-41d4-891b-65088d0c913e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-11-20 23:38:06,409 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a0d2f8-3e8e-41d4-891b-65088d0c913e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable22 [2021-11-20 23:38:06,410 INFO L402 AbstractCegarLoop]: === Iteration 24 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 15 more)] === [2021-11-20 23:38:06,410 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:38:06,410 INFO L85 PathProgramCache]: Analyzing trace with hash -1739438341, now seen corresponding path program 5 times [2021-11-20 23:38:06,410 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:38:06,410 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [432453865] [2021-11-20 23:38:06,410 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:38:06,410 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:38:06,432 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:38:06,613 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 1 proven. 23 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-20 23:38:06,613 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:38:06,613 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [432453865] [2021-11-20 23:38:06,613 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [432453865] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:38:06,613 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [689092252] [2021-11-20 23:38:06,613 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-20 23:38:06,614 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:38:06,614 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a0d2f8-3e8e-41d4-891b-65088d0c913e/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:38:06,615 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a0d2f8-3e8e-41d4-891b-65088d0c913e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:38:06,635 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a0d2f8-3e8e-41d4-891b-65088d0c913e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-11-20 23:38:06,702 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-11-20 23:38:06,702 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:38:06,704 INFO L263 TraceCheckSpWp]: Trace formula consists of 192 conjuncts, 30 conjunts are in the unsatisfiable core [2021-11-20 23:38:06,706 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:38:06,721 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-20 23:38:06,722 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 1 case distinctions, treesize of input 9 treesize of output 15 [2021-11-20 23:38:07,023 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 4 proven. 20 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-20 23:38:07,023 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:38:07,389 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 9 proven. 15 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-20 23:38:07,389 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [689092252] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:38:07,389 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1451909812] [2021-11-20 23:38:07,391 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-20 23:38:07,391 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:38:07,391 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:38:07,392 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:38:07,392 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:38:07,476 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:38:07,479 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-20 23:38:07,607 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 16 [2021-11-20 23:38:07,869 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-20 23:38:07,870 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 194 treesize of output 193 [2021-11-20 23:38:08,487 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:38:08,670 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:38:09,544 INFO L354 Elim1Store]: treesize reduction 22, result has 50.0 percent of original size [2021-11-20 23:38:09,544 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 198 treesize of output 202 [2021-11-20 23:38:10,250 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:38:10,494 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:38:10,696 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 14 treesize of output 10 [2021-11-20 23:38:10,848 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-20 23:38:10,849 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2021-11-20 23:38:14,697 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:38:16,631 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:38:16,631 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:38:16,631 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 11, 11] total 32 [2021-11-20 23:38:16,632 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [528371080] [2021-11-20 23:38:16,632 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:38:16,632 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2021-11-20 23:38:16,632 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:38:16,633 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2021-11-20 23:38:16,633 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=239, Invalid=2017, Unknown=0, NotChecked=0, Total=2256 [2021-11-20 23:38:16,634 INFO L87 Difference]: Start difference. First operand 129 states and 147 transitions. Second operand has 34 states, 33 states have (on average 2.6363636363636362) internal successors, (87), 33 states have internal predecessors, (87), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:38:17,269 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:38:17,269 INFO L93 Difference]: Finished difference Result 206 states and 230 transitions. [2021-11-20 23:38:17,270 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-11-20 23:38:17,270 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 33 states have (on average 2.6363636363636362) internal successors, (87), 33 states have internal predecessors, (87), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 29 [2021-11-20 23:38:17,270 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:38:17,272 INFO L225 Difference]: With dead ends: 206 [2021-11-20 23:38:17,272 INFO L226 Difference]: Without dead ends: 206 [2021-11-20 23:38:17,273 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 105 GetRequests, 49 SyntacticMatches, 0 SemanticMatches, 56 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 999 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=472, Invalid=2834, Unknown=0, NotChecked=0, Total=3306 [2021-11-20 23:38:17,274 INFO L933 BasicCegarLoop]: 15 mSDtfsCounter, 303 mSDsluCounter, 168 mSDsCounter, 0 mSdLazyCounter, 660 mSolverCounterSat, 31 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 303 SdHoareTripleChecker+Valid, 131 SdHoareTripleChecker+Invalid, 691 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 31 IncrementalHoareTripleChecker+Valid, 660 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-20 23:38:17,274 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [303 Valid, 131 Invalid, 691 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [31 Valid, 660 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-20 23:38:17,275 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 206 states. [2021-11-20 23:38:17,279 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 206 to 162. [2021-11-20 23:38:17,280 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 162 states, 160 states have (on average 1.16875) internal successors, (187), 161 states have internal predecessors, (187), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:38:17,280 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 162 states to 162 states and 187 transitions. [2021-11-20 23:38:17,281 INFO L78 Accepts]: Start accepts. Automaton has 162 states and 187 transitions. Word has length 29 [2021-11-20 23:38:17,281 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:38:17,281 INFO L470 AbstractCegarLoop]: Abstraction has 162 states and 187 transitions. [2021-11-20 23:38:17,281 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 34 states, 33 states have (on average 2.6363636363636362) internal successors, (87), 33 states have internal predecessors, (87), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:38:17,281 INFO L276 IsEmpty]: Start isEmpty. Operand 162 states and 187 transitions. [2021-11-20 23:38:17,282 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2021-11-20 23:38:17,282 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:38:17,282 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:38:17,316 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a0d2f8-3e8e-41d4-891b-65088d0c913e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Ended with exit code 0 [2021-11-20 23:38:17,507 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a0d2f8-3e8e-41d4-891b-65088d0c913e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable23 [2021-11-20 23:38:17,507 INFO L402 AbstractCegarLoop]: === Iteration 25 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 15 more)] === [2021-11-20 23:38:17,507 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:38:17,508 INFO L85 PathProgramCache]: Analyzing trace with hash -1151087095, now seen corresponding path program 3 times [2021-11-20 23:38:17,508 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:38:17,508 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1369981829] [2021-11-20 23:38:17,508 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:38:17,508 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:38:17,530 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:38:17,674 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-20 23:38:17,674 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:38:17,674 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1369981829] [2021-11-20 23:38:17,674 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1369981829] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:38:17,674 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1396989382] [2021-11-20 23:38:17,674 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-20 23:38:17,674 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:38:17,675 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a0d2f8-3e8e-41d4-891b-65088d0c913e/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:38:17,679 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a0d2f8-3e8e-41d4-891b-65088d0c913e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:38:17,703 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a0d2f8-3e8e-41d4-891b-65088d0c913e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-11-20 23:38:17,756 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-20 23:38:17,756 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:38:17,758 INFO L263 TraceCheckSpWp]: Trace formula consists of 195 conjuncts, 25 conjunts are in the unsatisfiable core [2021-11-20 23:38:17,760 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:38:17,920 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 1 proven. 14 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-20 23:38:17,920 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:38:18,084 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 5 treesize of output 3 [2021-11-20 23:38:18,110 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 1 proven. 14 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-20 23:38:18,110 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1396989382] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:38:18,110 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1243285586] [2021-11-20 23:38:18,112 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2021-11-20 23:38:18,112 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:38:18,112 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:38:18,112 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:38:18,112 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:38:18,203 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:38:18,204 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-20 23:38:18,343 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:38:18,550 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:38:18,550 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 200 treesize of output 192 [2021-11-20 23:38:19,035 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:38:19,235 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:38:20,002 INFO L354 Elim1Store]: treesize reduction 22, result has 50.0 percent of original size [2021-11-20 23:38:20,002 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 198 treesize of output 202 [2021-11-20 23:38:20,724 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:38:20,972 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:38:21,202 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 14 treesize of output 10 [2021-11-20 23:38:21,305 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-20 23:38:21,306 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2021-11-20 23:38:28,359 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:38:30,441 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:38:30,441 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:38:30,441 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 8, 8] total 18 [2021-11-20 23:38:30,441 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1812434526] [2021-11-20 23:38:30,441 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:38:30,442 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2021-11-20 23:38:30,442 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:38:30,442 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-11-20 23:38:30,443 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=147, Invalid=1043, Unknown=0, NotChecked=0, Total=1190 [2021-11-20 23:38:30,443 INFO L87 Difference]: Start difference. First operand 162 states and 187 transitions. Second operand has 20 states, 19 states have (on average 3.736842105263158) internal successors, (71), 19 states have internal predecessors, (71), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:38:30,767 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:38:30,767 INFO L93 Difference]: Finished difference Result 286 states and 327 transitions. [2021-11-20 23:38:30,768 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-20 23:38:30,768 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 19 states have (on average 3.736842105263158) internal successors, (71), 19 states have internal predecessors, (71), 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 30 [2021-11-20 23:38:30,768 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:38:30,770 INFO L225 Difference]: With dead ends: 286 [2021-11-20 23:38:30,770 INFO L226 Difference]: Without dead ends: 286 [2021-11-20 23:38:30,771 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 102 GetRequests, 60 SyntacticMatches, 2 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 399 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=239, Invalid=1483, Unknown=0, NotChecked=0, Total=1722 [2021-11-20 23:38:30,772 INFO L933 BasicCegarLoop]: 15 mSDtfsCounter, 275 mSDsluCounter, 108 mSDsCounter, 0 mSdLazyCounter, 300 mSolverCounterSat, 31 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 275 SdHoareTripleChecker+Valid, 110 SdHoareTripleChecker+Invalid, 331 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 31 IncrementalHoareTripleChecker+Valid, 300 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-20 23:38:30,772 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [275 Valid, 110 Invalid, 331 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [31 Valid, 300 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-20 23:38:30,773 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 286 states. [2021-11-20 23:38:30,781 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 286 to 224. [2021-11-20 23:38:30,782 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 224 states, 222 states have (on average 1.1666666666666667) internal successors, (259), 223 states have internal predecessors, (259), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:38:30,783 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 224 states to 224 states and 259 transitions. [2021-11-20 23:38:30,783 INFO L78 Accepts]: Start accepts. Automaton has 224 states and 259 transitions. Word has length 30 [2021-11-20 23:38:30,783 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:38:30,783 INFO L470 AbstractCegarLoop]: Abstraction has 224 states and 259 transitions. [2021-11-20 23:38:30,784 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 19 states have (on average 3.736842105263158) internal successors, (71), 19 states have internal predecessors, (71), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:38:30,784 INFO L276 IsEmpty]: Start isEmpty. Operand 224 states and 259 transitions. [2021-11-20 23:38:30,785 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2021-11-20 23:38:30,785 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:38:30,785 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:38:30,811 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a0d2f8-3e8e-41d4-891b-65088d0c913e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2021-11-20 23:38:30,999 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24,11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a0d2f8-3e8e-41d4-891b-65088d0c913e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:38:30,999 INFO L402 AbstractCegarLoop]: === Iteration 26 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 15 more)] === [2021-11-20 23:38:30,999 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:38:30,999 INFO L85 PathProgramCache]: Analyzing trace with hash 169207682, now seen corresponding path program 6 times [2021-11-20 23:38:31,000 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:38:31,000 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1289944662] [2021-11-20 23:38:31,000 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:38:31,000 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:38:31,019 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:38:31,177 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 10 proven. 27 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-20 23:38:31,177 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:38:31,177 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1289944662] [2021-11-20 23:38:31,177 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1289944662] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:38:31,178 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [935243887] [2021-11-20 23:38:31,178 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-20 23:38:31,178 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:38:31,178 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a0d2f8-3e8e-41d4-891b-65088d0c913e/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:38:31,179 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a0d2f8-3e8e-41d4-891b-65088d0c913e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:38:31,198 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a0d2f8-3e8e-41d4-891b-65088d0c913e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2021-11-20 23:38:31,260 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-20 23:38:31,260 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:38:31,262 INFO L263 TraceCheckSpWp]: Trace formula consists of 212 conjuncts, 38 conjunts are in the unsatisfiable core [2021-11-20 23:38:31,264 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:38:31,380 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-11-20 23:38:31,553 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 10 proven. 27 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-20 23:38:31,554 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:38:31,633 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 13 [2021-11-20 23:38:31,635 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 22 [2021-11-20 23:38:31,766 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 10 proven. 27 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-20 23:38:31,766 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [935243887] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:38:31,766 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2059902152] [2021-11-20 23:38:31,768 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-20 23:38:31,768 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:38:31,769 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:38:31,769 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:38:31,769 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:38:31,888 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:38:31,889 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-20 23:38:32,031 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 16 [2021-11-20 23:38:32,241 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-20 23:38:32,241 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 194 treesize of output 193 [2021-11-20 23:38:32,839 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:38:33,093 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:38:33,858 INFO L354 Elim1Store]: treesize reduction 28, result has 44.0 percent of original size [2021-11-20 23:38:33,858 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 204 treesize of output 208 [2021-11-20 23:38:34,598 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:38:34,821 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:38:35,040 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 14 treesize of output 10 [2021-11-20 23:38:35,134 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-20 23:38:35,134 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2021-11-20 23:38:38,935 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:38:40,917 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:38:40,918 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:38:40,918 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14, 14] total 27 [2021-11-20 23:38:40,918 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [643440577] [2021-11-20 23:38:40,918 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:38:40,918 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2021-11-20 23:38:40,918 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:38:40,919 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2021-11-20 23:38:40,919 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=153, Invalid=1487, Unknown=0, NotChecked=0, Total=1640 [2021-11-20 23:38:40,920 INFO L87 Difference]: Start difference. First operand 224 states and 259 transitions. Second operand has 27 states, 27 states have (on average 2.3703703703703702) internal successors, (64), 27 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:38:41,599 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:38:41,599 INFO L93 Difference]: Finished difference Result 337 states and 376 transitions. [2021-11-20 23:38:41,600 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-11-20 23:38:41,600 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 27 states have (on average 2.3703703703703702) internal successors, (64), 27 states have internal predecessors, (64), 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 33 [2021-11-20 23:38:41,600 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:38:41,602 INFO L225 Difference]: With dead ends: 337 [2021-11-20 23:38:41,602 INFO L226 Difference]: Without dead ends: 312 [2021-11-20 23:38:41,603 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 122 GetRequests, 69 SyntacticMatches, 3 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 2 DeprecatedPredicates, 667 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=294, Invalid=2358, Unknown=0, NotChecked=0, Total=2652 [2021-11-20 23:38:41,604 INFO L933 BasicCegarLoop]: 28 mSDtfsCounter, 203 mSDsluCounter, 365 mSDsCounter, 0 mSdLazyCounter, 602 mSolverCounterSat, 23 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 203 SdHoareTripleChecker+Valid, 280 SdHoareTripleChecker+Invalid, 677 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 23 IncrementalHoareTripleChecker+Valid, 602 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 52 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-20 23:38:41,604 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [203 Valid, 280 Invalid, 677 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [23 Valid, 602 Invalid, 0 Unknown, 52 Unchecked, 0.3s Time] [2021-11-20 23:38:41,605 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 312 states. [2021-11-20 23:38:41,611 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 312 to 282. [2021-11-20 23:38:41,612 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 282 states, 280 states have (on average 1.1607142857142858) internal successors, (325), 281 states have internal predecessors, (325), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:38:41,613 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 282 states to 282 states and 325 transitions. [2021-11-20 23:38:41,613 INFO L78 Accepts]: Start accepts. Automaton has 282 states and 325 transitions. Word has length 33 [2021-11-20 23:38:41,614 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:38:41,614 INFO L470 AbstractCegarLoop]: Abstraction has 282 states and 325 transitions. [2021-11-20 23:38:41,614 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 27 states have (on average 2.3703703703703702) internal successors, (64), 27 states have internal predecessors, (64), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:38:41,614 INFO L276 IsEmpty]: Start isEmpty. Operand 282 states and 325 transitions. [2021-11-20 23:38:41,615 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2021-11-20 23:38:41,615 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:38:41,615 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:38:41,654 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a0d2f8-3e8e-41d4-891b-65088d0c913e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2021-11-20 23:38:41,832 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a0d2f8-3e8e-41d4-891b-65088d0c913e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable25 [2021-11-20 23:38:41,833 INFO L402 AbstractCegarLoop]: === Iteration 27 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 15 more)] === [2021-11-20 23:38:41,833 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:38:41,833 INFO L85 PathProgramCache]: Analyzing trace with hash 675848208, now seen corresponding path program 7 times [2021-11-20 23:38:41,833 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:38:41,833 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [833987732] [2021-11-20 23:38:41,833 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:38:41,833 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:38:41,852 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:38:42,091 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 4 proven. 40 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-20 23:38:42,091 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:38:42,091 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [833987732] [2021-11-20 23:38:42,091 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [833987732] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:38:42,091 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1345698717] [2021-11-20 23:38:42,091 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-20 23:38:42,092 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:38:42,092 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a0d2f8-3e8e-41d4-891b-65088d0c913e/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:38:42,093 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a0d2f8-3e8e-41d4-891b-65088d0c913e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:38:42,114 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a0d2f8-3e8e-41d4-891b-65088d0c913e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2021-11-20 23:38:42,169 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:38:42,171 INFO L263 TraceCheckSpWp]: Trace formula consists of 222 conjuncts, 35 conjunts are in the unsatisfiable core [2021-11-20 23:38:42,173 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:38:42,381 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 9 proven. 35 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-20 23:38:42,381 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:38:42,630 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 5 treesize of output 3 [2021-11-20 23:38:42,679 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 9 proven. 35 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-20 23:38:42,680 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1345698717] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:38:42,680 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [968603650] [2021-11-20 23:38:42,683 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-20 23:38:42,684 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:38:42,684 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:38:42,685 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:38:42,685 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:38:42,711 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:38:42,712 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-20 23:38:42,979 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 16 [2021-11-20 23:38:43,232 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-20 23:38:43,233 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 194 treesize of output 193 [2021-11-20 23:38:43,807 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:38:43,997 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:38:44,659 INFO L354 Elim1Store]: treesize reduction 22, result has 50.0 percent of original size [2021-11-20 23:38:44,659 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 198 treesize of output 202 [2021-11-20 23:38:45,648 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:38:45,869 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:38:46,030 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 14 treesize of output 10 [2021-11-20 23:38:46,111 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-20 23:38:46,111 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2021-11-20 23:38:49,786 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:38:51,679 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:38:51,679 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:38:51,679 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 13, 13] total 28 [2021-11-20 23:38:51,679 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [217441910] [2021-11-20 23:38:51,679 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:38:51,680 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2021-11-20 23:38:51,680 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:38:51,680 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2021-11-20 23:38:51,681 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=181, Invalid=1625, Unknown=0, NotChecked=0, Total=1806 [2021-11-20 23:38:51,681 INFO L87 Difference]: Start difference. First operand 282 states and 325 transitions. Second operand has 29 states, 28 states have (on average 2.7857142857142856) internal successors, (78), 29 states have internal predecessors, (78), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:38:52,436 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:38:52,436 INFO L93 Difference]: Finished difference Result 374 states and 419 transitions. [2021-11-20 23:38:52,437 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-11-20 23:38:52,437 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 28 states have (on average 2.7857142857142856) internal successors, (78), 29 states have internal predecessors, (78), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 35 [2021-11-20 23:38:52,437 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:38:52,439 INFO L225 Difference]: With dead ends: 374 [2021-11-20 23:38:52,439 INFO L226 Difference]: Without dead ends: 374 [2021-11-20 23:38:52,440 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 126 GetRequests, 72 SyntacticMatches, 2 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 804 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=388, Invalid=2474, Unknown=0, NotChecked=0, Total=2862 [2021-11-20 23:38:52,441 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 291 mSDsluCounter, 242 mSDsCounter, 0 mSdLazyCounter, 949 mSolverCounterSat, 30 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 291 SdHoareTripleChecker+Valid, 189 SdHoareTripleChecker+Invalid, 979 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 30 IncrementalHoareTripleChecker+Valid, 949 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-20 23:38:52,441 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [291 Valid, 189 Invalid, 979 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [30 Valid, 949 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-20 23:38:52,442 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 374 states. [2021-11-20 23:38:52,452 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 374 to 298. [2021-11-20 23:38:52,452 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 298 states, 296 states have (on average 1.162162162162162) internal successors, (344), 297 states have internal predecessors, (344), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:38:52,453 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 298 states to 298 states and 344 transitions. [2021-11-20 23:38:52,454 INFO L78 Accepts]: Start accepts. Automaton has 298 states and 344 transitions. Word has length 35 [2021-11-20 23:38:52,454 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:38:52,454 INFO L470 AbstractCegarLoop]: Abstraction has 298 states and 344 transitions. [2021-11-20 23:38:52,454 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 28 states have (on average 2.7857142857142856) internal successors, (78), 29 states have internal predecessors, (78), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:38:52,455 INFO L276 IsEmpty]: Start isEmpty. Operand 298 states and 344 transitions. [2021-11-20 23:38:52,456 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2021-11-20 23:38:52,456 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:38:52,456 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:38:52,494 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a0d2f8-3e8e-41d4-891b-65088d0c913e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2021-11-20 23:38:52,671 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a0d2f8-3e8e-41d4-891b-65088d0c913e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable26 [2021-11-20 23:38:52,672 INFO L402 AbstractCegarLoop]: === Iteration 28 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 15 more)] === [2021-11-20 23:38:52,672 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:38:52,672 INFO L85 PathProgramCache]: Analyzing trace with hash -1772114409, now seen corresponding path program 8 times [2021-11-20 23:38:52,672 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:38:52,672 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [709334332] [2021-11-20 23:38:52,672 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:38:52,672 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:38:52,702 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:38:52,915 INFO L134 CoverageAnalysis]: Checked inductivity of 62 backedges. 13 proven. 48 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-20 23:38:52,915 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:38:52,915 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [709334332] [2021-11-20 23:38:52,915 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [709334332] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:38:52,915 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [710176604] [2021-11-20 23:38:52,915 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-20 23:38:52,915 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:38:52,915 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a0d2f8-3e8e-41d4-891b-65088d0c913e/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:38:52,916 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a0d2f8-3e8e-41d4-891b-65088d0c913e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:38:52,939 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a0d2f8-3e8e-41d4-891b-65088d0c913e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2021-11-20 23:38:53,079 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2021-11-20 23:38:53,079 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:38:53,081 INFO L263 TraceCheckSpWp]: Trace formula consists of 242 conjuncts, 42 conjunts are in the unsatisfiable core [2021-11-20 23:38:53,084 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:38:53,100 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-20 23:38:53,101 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 1 case distinctions, treesize of input 9 treesize of output 15 [2021-11-20 23:38:53,297 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:38:53,739 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-20 23:38:53,740 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 42 treesize of output 38 [2021-11-20 23:38:53,898 INFO L134 CoverageAnalysis]: Checked inductivity of 62 backedges. 9 proven. 52 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-20 23:38:53,898 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:38:54,573 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 29 treesize of output 27 [2021-11-20 23:38:54,575 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 35 treesize of output 33 [2021-11-20 23:38:55,139 INFO L134 CoverageAnalysis]: Checked inductivity of 62 backedges. 16 proven. 45 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-20 23:38:55,139 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [710176604] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:38:55,139 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [430479245] [2021-11-20 23:38:55,141 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-20 23:38:55,141 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:38:55,142 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:38:55,142 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:38:55,142 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:38:55,243 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:38:55,246 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-20 23:38:55,352 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 16 [2021-11-20 23:38:55,580 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-20 23:38:55,580 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 194 treesize of output 193 [2021-11-20 23:38:56,163 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:38:56,342 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:38:57,023 INFO L354 Elim1Store]: treesize reduction 22, result has 50.0 percent of original size [2021-11-20 23:38:57,024 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 198 treesize of output 202 [2021-11-20 23:38:57,829 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:38:57,998 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:38:58,201 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 14 treesize of output 10 [2021-11-20 23:38:58,405 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-20 23:38:58,405 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2021-11-20 23:39:01,815 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:39:04,254 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:39:04,254 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:39:04,254 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 16] total 48 [2021-11-20 23:39:04,254 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1089563007] [2021-11-20 23:39:04,254 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:39:04,255 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 49 states [2021-11-20 23:39:04,255 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:39:04,255 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2021-11-20 23:39:04,257 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=314, Invalid=3592, Unknown=0, NotChecked=0, Total=3906 [2021-11-20 23:39:04,257 INFO L87 Difference]: Start difference. First operand 298 states and 344 transitions. Second operand has 49 states, 49 states have (on average 2.3877551020408165) internal successors, (117), 48 states have internal predecessors, (117), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:39:06,117 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:39:06,117 INFO L93 Difference]: Finished difference Result 371 states and 418 transitions. [2021-11-20 23:39:06,117 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2021-11-20 23:39:06,117 INFO L78 Accepts]: Start accepts. Automaton has has 49 states, 49 states have (on average 2.3877551020408165) internal successors, (117), 48 states have internal predecessors, (117), 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 39 [2021-11-20 23:39:06,118 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:39:06,120 INFO L225 Difference]: With dead ends: 371 [2021-11-20 23:39:06,120 INFO L226 Difference]: Without dead ends: 346 [2021-11-20 23:39:06,123 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 181 GetRequests, 81 SyntacticMatches, 2 SemanticMatches, 98 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2803 ImplicationChecksByTransitivity, 4.9s TimeCoverageRelationStatistics Valid=920, Invalid=8980, Unknown=0, NotChecked=0, Total=9900 [2021-11-20 23:39:06,124 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 472 mSDsluCounter, 461 mSDsCounter, 0 mSdLazyCounter, 994 mSolverCounterSat, 48 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 472 SdHoareTripleChecker+Valid, 394 SdHoareTripleChecker+Invalid, 1355 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 48 IncrementalHoareTripleChecker+Valid, 994 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 313 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-20 23:39:06,124 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [472 Valid, 394 Invalid, 1355 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [48 Valid, 994 Invalid, 0 Unknown, 313 Unchecked, 0.5s Time] [2021-11-20 23:39:06,125 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 346 states. [2021-11-20 23:39:06,132 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 346 to 331. [2021-11-20 23:39:06,132 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 331 states, 329 states have (on average 1.1610942249240122) internal successors, (382), 330 states have internal predecessors, (382), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:39:06,134 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 331 states to 331 states and 382 transitions. [2021-11-20 23:39:06,134 INFO L78 Accepts]: Start accepts. Automaton has 331 states and 382 transitions. Word has length 39 [2021-11-20 23:39:06,134 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:39:06,134 INFO L470 AbstractCegarLoop]: Abstraction has 331 states and 382 transitions. [2021-11-20 23:39:06,135 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 49 states, 49 states have (on average 2.3877551020408165) internal successors, (117), 48 states have internal predecessors, (117), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:39:06,135 INFO L276 IsEmpty]: Start isEmpty. Operand 331 states and 382 transitions. [2021-11-20 23:39:06,136 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2021-11-20 23:39:06,136 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:39:06,136 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:39:06,166 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a0d2f8-3e8e-41d4-891b-65088d0c913e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2021-11-20 23:39:06,351 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable27,14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a0d2f8-3e8e-41d4-891b-65088d0c913e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:39:06,351 INFO L402 AbstractCegarLoop]: === Iteration 29 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 15 more)] === [2021-11-20 23:39:06,351 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:39:06,351 INFO L85 PathProgramCache]: Analyzing trace with hash 155482516, now seen corresponding path program 4 times [2021-11-20 23:39:06,352 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:39:06,352 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1147498072] [2021-11-20 23:39:06,352 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:39:06,352 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:39:06,384 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:39:06,845 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 3 proven. 32 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:39:06,845 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:39:06,845 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1147498072] [2021-11-20 23:39:06,845 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1147498072] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:39:06,846 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [81579803] [2021-11-20 23:39:06,846 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-20 23:39:06,846 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:39:06,846 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a0d2f8-3e8e-41d4-891b-65088d0c913e/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:39:06,846 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a0d2f8-3e8e-41d4-891b-65088d0c913e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:39:06,847 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a0d2f8-3e8e-41d4-891b-65088d0c913e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2021-11-20 23:39:06,906 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:39:06,908 INFO L263 TraceCheckSpWp]: Trace formula consists of 240 conjuncts, 46 conjunts are in the unsatisfiable core [2021-11-20 23:39:06,910 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:39:06,923 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-20 23:39:06,924 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 1 case distinctions, treesize of input 9 treesize of output 15 [2021-11-20 23:39:07,208 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-11-20 23:39:07,283 INFO L354 Elim1Store]: treesize reduction 44, result has 18.5 percent of original size [2021-11-20 23:39:07,283 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 44 treesize of output 43 [2021-11-20 23:39:08,361 INFO L354 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-11-20 23:39:08,362 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 23 [2021-11-20 23:39:09,329 INFO L354 Elim1Store]: treesize reduction 61, result has 29.9 percent of original size [2021-11-20 23:39:09,330 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 67 treesize of output 66 [2021-11-20 23:39:09,372 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 3 proven. 32 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:39:09,372 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:39:10,266 INFO L354 Elim1Store]: treesize reduction 12, result has 7.7 percent of original size [2021-11-20 23:39:10,266 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 425 treesize of output 381 [2021-11-20 23:39:11,238 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 3 proven. 32 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:39:11,238 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [81579803] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:39:11,238 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1496034825] [2021-11-20 23:39:11,240 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2021-11-20 23:39:11,240 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:39:11,240 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:39:11,240 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:39:11,240 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:39:11,365 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:39:11,366 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-20 23:39:11,482 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 16 [2021-11-20 23:39:11,750 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-20 23:39:11,750 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 194 treesize of output 193 [2021-11-20 23:39:12,496 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:39:12,773 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:39:13,454 INFO L354 Elim1Store]: treesize reduction 22, result has 50.0 percent of original size [2021-11-20 23:39:13,455 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 198 treesize of output 202 [2021-11-20 23:39:14,347 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:39:14,572 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:39:14,720 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 14 treesize of output 10 [2021-11-20 23:39:14,981 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-20 23:39:14,981 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2021-11-20 23:39:22,711 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:39:25,795 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:39:25,796 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:39:25,796 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 18, 18] total 52 [2021-11-20 23:39:25,796 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [780754665] [2021-11-20 23:39:25,796 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:39:25,796 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 53 states [2021-11-20 23:39:25,796 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:39:25,797 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2021-11-20 23:39:25,798 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=260, Invalid=4296, Unknown=0, NotChecked=0, Total=4556 [2021-11-20 23:39:25,798 INFO L87 Difference]: Start difference. First operand 331 states and 382 transitions. Second operand has 53 states, 53 states have (on average 2.0943396226415096) internal successors, (111), 52 states have internal predecessors, (111), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:39:44,084 WARN L227 SmtUtils]: Spent 12.11s on a formula simplification. DAG size of input: 78 DAG size of output: 76 (called from [L 360] de.uni_freiburg.informatik.ultimate.lib.modelcheckerutils.smt.predicates.PredicateUnifier.getOrConstructPredicate) [2021-11-20 23:39:46,905 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:39:46,906 INFO L93 Difference]: Finished difference Result 446 states and 508 transitions. [2021-11-20 23:39:46,906 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 39 states. [2021-11-20 23:39:46,906 INFO L78 Accepts]: Start accepts. Automaton has has 53 states, 53 states have (on average 2.0943396226415096) internal successors, (111), 52 states have internal predecessors, (111), 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 39 [2021-11-20 23:39:46,906 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:39:46,908 INFO L225 Difference]: With dead ends: 446 [2021-11-20 23:39:46,908 INFO L226 Difference]: Without dead ends: 413 [2021-11-20 23:39:46,910 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 162 GetRequests, 71 SyntacticMatches, 1 SemanticMatches, 90 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1693 ImplicationChecksByTransitivity, 26.2s TimeCoverageRelationStatistics Valid=531, Invalid=7840, Unknown=1, NotChecked=0, Total=8372 [2021-11-20 23:39:46,911 INFO L933 BasicCegarLoop]: 9 mSDtfsCounter, 91 mSDsluCounter, 281 mSDsCounter, 0 mSdLazyCounter, 350 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 91 SdHoareTripleChecker+Valid, 274 SdHoareTripleChecker+Invalid, 715 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 350 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 352 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-20 23:39:46,912 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [91 Valid, 274 Invalid, 715 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 350 Invalid, 0 Unknown, 352 Unchecked, 0.2s Time] [2021-11-20 23:39:46,913 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 413 states. [2021-11-20 23:39:46,921 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 413 to 400. [2021-11-20 23:39:46,922 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 400 states, 398 states have (on average 1.1532663316582914) internal successors, (459), 399 states have internal predecessors, (459), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:39:46,924 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 400 states to 400 states and 459 transitions. [2021-11-20 23:39:46,924 INFO L78 Accepts]: Start accepts. Automaton has 400 states and 459 transitions. Word has length 39 [2021-11-20 23:39:46,924 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:39:46,925 INFO L470 AbstractCegarLoop]: Abstraction has 400 states and 459 transitions. [2021-11-20 23:39:46,925 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 53 states, 53 states have (on average 2.0943396226415096) internal successors, (111), 52 states have internal predecessors, (111), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:39:46,925 INFO L276 IsEmpty]: Start isEmpty. Operand 400 states and 459 transitions. [2021-11-20 23:39:46,926 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2021-11-20 23:39:46,926 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:39:46,927 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:39:46,955 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a0d2f8-3e8e-41d4-891b-65088d0c913e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2021-11-20 23:39:47,139 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a0d2f8-3e8e-41d4-891b-65088d0c913e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable28 [2021-11-20 23:39:47,139 INFO L402 AbstractCegarLoop]: === Iteration 30 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 15 more)] === [2021-11-20 23:39:47,139 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:39:47,140 INFO L85 PathProgramCache]: Analyzing trace with hash -2031375522, now seen corresponding path program 5 times [2021-11-20 23:39:47,140 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:39:47,140 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1584346648] [2021-11-20 23:39:47,140 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:39:47,140 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:39:47,150 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:39:47,301 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 1 proven. 38 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-20 23:39:47,301 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:39:47,301 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1584346648] [2021-11-20 23:39:47,301 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1584346648] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:39:47,301 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1246251233] [2021-11-20 23:39:47,302 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-20 23:39:47,302 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:39:47,302 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a0d2f8-3e8e-41d4-891b-65088d0c913e/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:39:47,315 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a0d2f8-3e8e-41d4-891b-65088d0c913e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:39:47,316 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a0d2f8-3e8e-41d4-891b-65088d0c913e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2021-11-20 23:39:47,422 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-11-20 23:39:47,422 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:39:47,425 INFO L263 TraceCheckSpWp]: Trace formula consists of 250 conjuncts, 28 conjunts are in the unsatisfiable core [2021-11-20 23:39:47,427 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:39:47,730 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 4 proven. 35 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-20 23:39:47,730 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:39:48,052 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 5 [2021-11-20 23:39:48,086 INFO L134 CoverageAnalysis]: Checked inductivity of 40 backedges. 4 proven. 35 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-20 23:39:48,086 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1246251233] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:39:48,087 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [565803330] [2021-11-20 23:39:48,088 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2021-11-20 23:39:48,088 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:39:48,088 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:39:48,088 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:39:48,088 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:39:48,155 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:39:48,156 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-20 23:39:48,383 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 16 [2021-11-20 23:39:48,601 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-20 23:39:48,601 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 194 treesize of output 193 [2021-11-20 23:39:49,369 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:39:49,615 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:39:50,565 INFO L354 Elim1Store]: treesize reduction 28, result has 44.0 percent of original size [2021-11-20 23:39:50,565 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 204 treesize of output 208 [2021-11-20 23:39:51,389 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:39:51,647 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:39:51,857 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 14 treesize of output 10 [2021-11-20 23:39:51,994 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-20 23:39:51,995 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2021-11-20 23:39:59,668 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:40:02,007 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:40:02,007 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:40:02,007 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 10, 10] total 25 [2021-11-20 23:40:02,008 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1538805890] [2021-11-20 23:40:02,008 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:40:02,008 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2021-11-20 23:40:02,008 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:40:02,009 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2021-11-20 23:40:02,009 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=194, Invalid=1528, Unknown=0, NotChecked=0, Total=1722 [2021-11-20 23:40:02,010 INFO L87 Difference]: Start difference. First operand 400 states and 459 transitions. Second operand has 27 states, 26 states have (on average 4.3076923076923075) internal successors, (112), 26 states have internal predecessors, (112), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:40:02,506 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:40:02,506 INFO L93 Difference]: Finished difference Result 756 states and 872 transitions. [2021-11-20 23:40:02,506 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-11-20 23:40:02,506 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 26 states have (on average 4.3076923076923075) internal successors, (112), 26 states have internal predecessors, (112), 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 41 [2021-11-20 23:40:02,507 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:40:02,511 INFO L225 Difference]: With dead ends: 756 [2021-11-20 23:40:02,511 INFO L226 Difference]: Without dead ends: 756 [2021-11-20 23:40:02,511 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 139 GetRequests, 89 SyntacticMatches, 1 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 687 ImplicationChecksByTransitivity, 2.9s TimeCoverageRelationStatistics Valid=345, Invalid=2205, Unknown=0, NotChecked=0, Total=2550 [2021-11-20 23:40:02,512 INFO L933 BasicCegarLoop]: 25 mSDtfsCounter, 271 mSDsluCounter, 171 mSDsCounter, 0 mSdLazyCounter, 458 mSolverCounterSat, 24 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 271 SdHoareTripleChecker+Valid, 167 SdHoareTripleChecker+Invalid, 482 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 24 IncrementalHoareTripleChecker+Valid, 458 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-20 23:40:02,513 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [271 Valid, 167 Invalid, 482 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [24 Valid, 458 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-20 23:40:02,519 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 756 states. [2021-11-20 23:40:02,534 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 756 to 521. [2021-11-20 23:40:02,536 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 521 states, 519 states have (on average 1.1560693641618498) internal successors, (600), 520 states have internal predecessors, (600), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:40:02,538 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 521 states to 521 states and 600 transitions. [2021-11-20 23:40:02,538 INFO L78 Accepts]: Start accepts. Automaton has 521 states and 600 transitions. Word has length 41 [2021-11-20 23:40:02,539 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:40:02,539 INFO L470 AbstractCegarLoop]: Abstraction has 521 states and 600 transitions. [2021-11-20 23:40:02,539 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 26 states have (on average 4.3076923076923075) internal successors, (112), 26 states have internal predecessors, (112), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:40:02,539 INFO L276 IsEmpty]: Start isEmpty. Operand 521 states and 600 transitions. [2021-11-20 23:40:02,540 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 43 [2021-11-20 23:40:02,541 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:40:02,541 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 5, 4, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:40:02,576 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a0d2f8-3e8e-41d4-891b-65088d0c913e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2021-11-20 23:40:02,764 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29,16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a0d2f8-3e8e-41d4-891b-65088d0c913e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:40:02,764 INFO L402 AbstractCegarLoop]: === Iteration 31 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 15 more)] === [2021-11-20 23:40:02,765 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:40:02,765 INFO L85 PathProgramCache]: Analyzing trace with hash 237556233, now seen corresponding path program 1 times [2021-11-20 23:40:02,765 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:40:02,765 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1168060296] [2021-11-20 23:40:02,765 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:40:02,766 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:40:02,796 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:40:03,377 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 13 proven. 37 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-20 23:40:03,377 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:40:03,377 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1168060296] [2021-11-20 23:40:03,377 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1168060296] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:40:03,378 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [35792373] [2021-11-20 23:40:03,378 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:40:03,378 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:40:03,378 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a0d2f8-3e8e-41d4-891b-65088d0c913e/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:40:03,379 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a0d2f8-3e8e-41d4-891b-65088d0c913e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:40:03,379 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a0d2f8-3e8e-41d4-891b-65088d0c913e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2021-11-20 23:40:03,444 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:40:03,446 INFO L263 TraceCheckSpWp]: Trace formula consists of 257 conjuncts, 34 conjunts are in the unsatisfiable core [2021-11-20 23:40:03,447 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:40:03,625 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 27 treesize of output 23 [2021-11-20 23:40:04,301 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 13 proven. 33 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-20 23:40:04,301 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:40:04,594 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 22 treesize of output 20 [2021-11-20 23:40:04,596 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 32 treesize of output 28 [2021-11-20 23:40:04,872 INFO L134 CoverageAnalysis]: Checked inductivity of 56 backedges. 13 proven. 33 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-20 23:40:04,872 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [35792373] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:40:04,872 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1561731524] [2021-11-20 23:40:04,874 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2021-11-20 23:40:04,874 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:40:04,875 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:40:04,875 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:40:04,875 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:40:04,905 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:40:04,906 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-20 23:40:05,189 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 16 [2021-11-20 23:40:05,443 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-20 23:40:05,444 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 194 treesize of output 193 [2021-11-20 23:40:06,014 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:40:06,258 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:40:06,938 INFO L354 Elim1Store]: treesize reduction 22, result has 50.0 percent of original size [2021-11-20 23:40:06,939 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 198 treesize of output 202 [2021-11-20 23:40:08,008 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:40:08,189 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:40:08,391 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 14 treesize of output 10 [2021-11-20 23:40:08,575 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-20 23:40:08,576 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2021-11-20 23:40:21,993 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:40:24,326 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:40:24,326 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:40:24,326 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 13, 13] total 34 [2021-11-20 23:40:24,326 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1307995015] [2021-11-20 23:40:24,326 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:40:24,327 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2021-11-20 23:40:24,327 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:40:24,327 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2021-11-20 23:40:24,328 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=203, Invalid=2247, Unknown=0, NotChecked=0, Total=2450 [2021-11-20 23:40:24,328 INFO L87 Difference]: Start difference. First operand 521 states and 600 transitions. Second operand has 35 states, 35 states have (on average 2.6285714285714286) internal successors, (92), 34 states have internal predecessors, (92), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:40:26,499 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:40:26,500 INFO L93 Difference]: Finished difference Result 685 states and 773 transitions. [2021-11-20 23:40:26,505 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2021-11-20 23:40:26,505 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 35 states have (on average 2.6285714285714286) internal successors, (92), 34 states have internal predecessors, (92), 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 42 [2021-11-20 23:40:26,505 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:40:26,508 INFO L225 Difference]: With dead ends: 685 [2021-11-20 23:40:26,508 INFO L226 Difference]: Without dead ends: 675 [2021-11-20 23:40:26,509 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 171 GetRequests, 91 SyntacticMatches, 1 SemanticMatches, 79 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1630 ImplicationChecksByTransitivity, 4.8s TimeCoverageRelationStatistics Valid=601, Invalid=5879, Unknown=0, NotChecked=0, Total=6480 [2021-11-20 23:40:26,510 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 347 mSDsluCounter, 514 mSDsCounter, 0 mSdLazyCounter, 911 mSolverCounterSat, 47 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 347 SdHoareTripleChecker+Valid, 370 SdHoareTripleChecker+Invalid, 1256 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 47 IncrementalHoareTripleChecker+Valid, 911 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 298 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-20 23:40:26,510 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [347 Valid, 370 Invalid, 1256 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [47 Valid, 911 Invalid, 0 Unknown, 298 Unchecked, 0.5s Time] [2021-11-20 23:40:26,511 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 675 states. [2021-11-20 23:40:26,522 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 675 to 437. [2021-11-20 23:40:26,523 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 437 states, 435 states have (on average 1.1471264367816092) internal successors, (499), 436 states have internal predecessors, (499), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:40:26,525 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 437 states to 437 states and 499 transitions. [2021-11-20 23:40:26,525 INFO L78 Accepts]: Start accepts. Automaton has 437 states and 499 transitions. Word has length 42 [2021-11-20 23:40:26,525 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:40:26,526 INFO L470 AbstractCegarLoop]: Abstraction has 437 states and 499 transitions. [2021-11-20 23:40:26,526 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 35 states have (on average 2.6285714285714286) internal successors, (92), 34 states have internal predecessors, (92), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:40:26,526 INFO L276 IsEmpty]: Start isEmpty. Operand 437 states and 499 transitions. [2021-11-20 23:40:26,527 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2021-11-20 23:40:26,527 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:40:26,527 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1] [2021-11-20 23:40:26,553 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a0d2f8-3e8e-41d4-891b-65088d0c913e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Ended with exit code 0 [2021-11-20 23:40:26,739 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30,17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a0d2f8-3e8e-41d4-891b-65088d0c913e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:40:26,739 INFO L402 AbstractCegarLoop]: === Iteration 32 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 15 more)] === [2021-11-20 23:40:26,739 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:40:26,740 INFO L85 PathProgramCache]: Analyzing trace with hash -229729232, now seen corresponding path program 6 times [2021-11-20 23:40:26,740 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:40:26,740 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [272761264] [2021-11-20 23:40:26,740 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:40:26,740 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:40:26,760 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:40:27,220 INFO L134 CoverageAnalysis]: Checked inductivity of 43 backedges. 3 proven. 40 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:40:27,220 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:40:27,221 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [272761264] [2021-11-20 23:40:27,221 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [272761264] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:40:27,221 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1314017900] [2021-11-20 23:40:27,221 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-20 23:40:27,222 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:40:27,222 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a0d2f8-3e8e-41d4-891b-65088d0c913e/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:40:27,225 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a0d2f8-3e8e-41d4-891b-65088d0c913e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:40:27,228 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a0d2f8-3e8e-41d4-891b-65088d0c913e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2021-11-20 23:40:27,305 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-20 23:40:27,305 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:40:27,308 INFO L263 TraceCheckSpWp]: Trace formula consists of 260 conjuncts, 63 conjunts are in the unsatisfiable core [2021-11-20 23:40:27,309 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:40:27,485 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-11-20 23:40:27,559 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-20 23:40:27,560 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 31 treesize of output 30 [2021-11-20 23:40:28,740 INFO L354 Elim1Store]: treesize reduction 108, result has 21.2 percent of original size [2021-11-20 23:40:28,740 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 5 select indices, 5 select index equivalence classes, 0 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 10 case distinctions, treesize of input 62 treesize of output 54 [2021-11-20 23:40:28,775 INFO L134 CoverageAnalysis]: Checked inductivity of 43 backedges. 3 proven. 31 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-20 23:40:28,776 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:40:31,093 WARN L838 $PredicateComparison]: unable to prove that (forall ((|ULTIMATE.start_main_~nondetString2~0#1.offset| Int) (|ULTIMATE.start_main_~nondetString2~0#1.base| Int) (|ULTIMATE.start_main_~length2~0#1| Int)) (let ((.cse2 (store (select |c_#memory_int| |ULTIMATE.start_main_~nondetString2~0#1.base|) (+ (- 1) |ULTIMATE.start_main_~nondetString2~0#1.offset| |ULTIMATE.start_main_~length2~0#1|) 0))) (let ((.cse0 (select .cse2 |ULTIMATE.start_main_~nondetString2~0#1.offset|)) (.cse1 (select (store |c_#memory_int| |ULTIMATE.start_main_~nondetString2~0#1.base| .cse2) |c_ULTIMATE.start_main_~nondetString1~0#1.base|))) (or (not (= .cse0 (select .cse1 |c_ULTIMATE.start_main_~nondetString1~0#1.offset|))) (= .cse0 0) (not (= .cse0 (select .cse1 (+ |c_ULTIMATE.start_main_~nondetString1~0#1.offset| 2)))))))) is different from false [2021-11-20 23:40:31,140 INFO L354 Elim1Store]: treesize reduction 62, result has 32.6 percent of original size [2021-11-20 23:40:31,141 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 375 treesize of output 295 [2021-11-20 23:40:31,159 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-20 23:40:31,159 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 287 treesize of output 271 [2021-11-20 23:40:31,285 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 84 treesize of output 78 [2021-11-20 23:40:31,333 INFO L354 Elim1Store]: treesize reduction 28, result has 20.0 percent of original size [2021-11-20 23:40:31,334 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 25 treesize of output 18 [2021-11-20 23:40:31,680 INFO L134 CoverageAnalysis]: Checked inductivity of 43 backedges. 12 proven. 22 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2021-11-20 23:40:31,680 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1314017900] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:40:31,680 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1589981197] [2021-11-20 23:40:31,682 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2021-11-20 23:40:31,682 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:40:31,682 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:40:31,682 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:40:31,682 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:40:31,782 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:40:31,784 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-20 23:40:31,995 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:40:32,199 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:40:32,200 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 200 treesize of output 192 [2021-11-20 23:40:32,777 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:40:33,000 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:40:33,631 INFO L354 Elim1Store]: treesize reduction 28, result has 44.0 percent of original size [2021-11-20 23:40:33,632 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 204 treesize of output 208 [2021-11-20 23:40:34,504 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:40:34,716 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:40:34,957 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 14 treesize of output 10 [2021-11-20 23:40:35,110 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-20 23:40:35,110 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2021-11-20 23:40:42,735 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:40:45,497 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:40:45,497 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:40:45,497 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 18, 18] total 49 [2021-11-20 23:40:45,498 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1778981378] [2021-11-20 23:40:45,498 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:40:45,498 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 50 states [2021-11-20 23:40:45,498 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:40:45,498 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2021-11-20 23:40:45,499 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=269, Invalid=3766, Unknown=1, NotChecked=124, Total=4160 [2021-11-20 23:40:45,499 INFO L87 Difference]: Start difference. First operand 437 states and 499 transitions. Second operand has 50 states, 50 states have (on average 2.02) internal successors, (101), 49 states have internal predecessors, (101), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:40:47,839 WARN L838 $PredicateComparison]: unable to prove that (and (not (= |c_ULTIMATE.start_main_~nondetString2~0#1.base| |c_ULTIMATE.start_main_~nondetString1~0#1.base|)) (= |c_ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= |c_ULTIMATE.start_main_~i~1#1| 2) (<= 2 |c_ULTIMATE.start_main_~i~1#1|) (<= |c_ULTIMATE.start_main_~length1~0#1| (+ |c_ULTIMATE.start_main_~i~1#1| 1)) (<= |c_ULTIMATE.start_main_~i~0#1| 2) (<= 3 |c_ULTIMATE.start_main_~length1~0#1|) (= (select (select (store |c_#memory_int| |c_ULTIMATE.start_main_~nondetString2~0#1.base| (store (select |c_#memory_int| |c_ULTIMATE.start_main_~nondetString2~0#1.base|) (+ (- 1) |c_ULTIMATE.start_main_~nondetString2~0#1.offset| |c_ULTIMATE.start_main_~length2~0#1|) 0)) |c_ULTIMATE.start_main_~nondetString1~0#1.base|) (+ |c_ULTIMATE.start_main_~nondetString2~0#1.offset| 2)) 0) (< (+ |c_ULTIMATE.start_main_~nondetString2~0#1.offset| |c_ULTIMATE.start_main_~i~1#1|) (+ |c_ULTIMATE.start_main_~nondetString1~0#1.offset| |c_ULTIMATE.start_main_~length1~0#1|)) (= |c_ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (forall ((|ULTIMATE.start_main_~nondetString2~0#1.offset| Int) (|ULTIMATE.start_main_~nondetString2~0#1.base| Int) (|ULTIMATE.start_main_~length2~0#1| Int)) (let ((.cse2 (store (select |c_#memory_int| |ULTIMATE.start_main_~nondetString2~0#1.base|) (+ (- 1) |ULTIMATE.start_main_~nondetString2~0#1.offset| |ULTIMATE.start_main_~length2~0#1|) 0))) (let ((.cse0 (select .cse2 |ULTIMATE.start_main_~nondetString2~0#1.offset|)) (.cse1 (select (store |c_#memory_int| |ULTIMATE.start_main_~nondetString2~0#1.base| .cse2) |c_ULTIMATE.start_main_~nondetString1~0#1.base|))) (or (not (= .cse0 (select .cse1 |c_ULTIMATE.start_main_~nondetString1~0#1.offset|))) (= .cse0 0) (not (= .cse0 (select .cse1 (+ |c_ULTIMATE.start_main_~nondetString1~0#1.offset| 2))))))))) is different from false [2021-11-20 23:40:49,976 WARN L838 $PredicateComparison]: unable to prove that (and (not (= |c_ULTIMATE.start_main_~nondetString2~0#1.base| |c_ULTIMATE.start_main_~nondetString1~0#1.base|)) (= |c_ULTIMATE.start_main_~nondetString2~0#1.offset| 0) (<= |c_ULTIMATE.start_main_~i~0#1| 2) (= (+ |c_ULTIMATE.start_main_~nondetString2~0#1.offset| 3) (+ |c_ULTIMATE.start_main_~nondetString1~0#1.offset| |c_ULTIMATE.start_main_~length1~0#1|)) (<= 3 |c_ULTIMATE.start_main_~length1~0#1|) (= (select (select (store |c_#memory_int| |c_ULTIMATE.start_main_~nondetString2~0#1.base| (store (select |c_#memory_int| |c_ULTIMATE.start_main_~nondetString2~0#1.base|) (+ (- 1) |c_ULTIMATE.start_main_~nondetString2~0#1.offset| |c_ULTIMATE.start_main_~length2~0#1|) 0)) |c_ULTIMATE.start_main_~nondetString1~0#1.base|) (+ |c_ULTIMATE.start_main_~nondetString2~0#1.offset| 2)) 0) (= |c_ULTIMATE.start_main_~nondetString1~0#1.offset| 0) (forall ((|ULTIMATE.start_main_~nondetString2~0#1.offset| Int) (|ULTIMATE.start_main_~nondetString2~0#1.base| Int) (|ULTIMATE.start_main_~length2~0#1| Int)) (let ((.cse2 (store (select |c_#memory_int| |ULTIMATE.start_main_~nondetString2~0#1.base|) (+ (- 1) |ULTIMATE.start_main_~nondetString2~0#1.offset| |ULTIMATE.start_main_~length2~0#1|) 0))) (let ((.cse0 (select .cse2 |ULTIMATE.start_main_~nondetString2~0#1.offset|)) (.cse1 (select (store |c_#memory_int| |ULTIMATE.start_main_~nondetString2~0#1.base| .cse2) |c_ULTIMATE.start_main_~nondetString1~0#1.base|))) (or (not (= .cse0 (select .cse1 |c_ULTIMATE.start_main_~nondetString1~0#1.offset|))) (= .cse0 0) (not (= .cse0 (select .cse1 (+ |c_ULTIMATE.start_main_~nondetString1~0#1.offset| 2))))))))) is different from false [2021-11-20 23:40:50,262 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:40:50,262 INFO L93 Difference]: Finished difference Result 503 states and 569 transitions. [2021-11-20 23:40:50,262 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-11-20 23:40:50,262 INFO L78 Accepts]: Start accepts. Automaton has has 50 states, 50 states have (on average 2.02) internal successors, (101), 49 states have internal predecessors, (101), 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 43 [2021-11-20 23:40:50,269 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:40:50,271 INFO L225 Difference]: With dead ends: 503 [2021-11-20 23:40:50,271 INFO L226 Difference]: Without dead ends: 499 [2021-11-20 23:40:50,272 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 163 GetRequests, 84 SyntacticMatches, 1 SemanticMatches, 78 ConstructedPredicates, 3 IntricatePredicates, 0 DeprecatedPredicates, 1331 ImplicationChecksByTransitivity, 10.7s TimeCoverageRelationStatistics Valid=417, Invalid=5444, Unknown=3, NotChecked=456, Total=6320 [2021-11-20 23:40:50,272 INFO L933 BasicCegarLoop]: 6 mSDtfsCounter, 38 mSDsluCounter, 188 mSDsCounter, 0 mSdLazyCounter, 469 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 38 SdHoareTripleChecker+Valid, 149 SdHoareTripleChecker+Invalid, 583 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 469 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 104 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-20 23:40:50,273 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [38 Valid, 149 Invalid, 583 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 469 Invalid, 0 Unknown, 104 Unchecked, 0.2s Time] [2021-11-20 23:40:50,274 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 499 states. [2021-11-20 23:40:50,282 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 499 to 480. [2021-11-20 23:40:50,283 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 480 states, 478 states have (on average 1.1401673640167365) internal successors, (545), 479 states have internal predecessors, (545), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:40:50,284 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 480 states to 480 states and 545 transitions. [2021-11-20 23:40:50,284 INFO L78 Accepts]: Start accepts. Automaton has 480 states and 545 transitions. Word has length 43 [2021-11-20 23:40:50,285 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:40:50,285 INFO L470 AbstractCegarLoop]: Abstraction has 480 states and 545 transitions. [2021-11-20 23:40:50,285 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 50 states, 50 states have (on average 2.02) internal successors, (101), 49 states have internal predecessors, (101), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:40:50,285 INFO L276 IsEmpty]: Start isEmpty. Operand 480 states and 545 transitions. [2021-11-20 23:40:50,286 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2021-11-20 23:40:50,286 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:40:50,287 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:40:50,321 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a0d2f8-3e8e-41d4-891b-65088d0c913e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Forceful destruction successful, exit code 0 [2021-11-20 23:40:50,503 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31,18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a0d2f8-3e8e-41d4-891b-65088d0c913e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:40:50,503 INFO L402 AbstractCegarLoop]: === Iteration 33 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 15 more)] === [2021-11-20 23:40:50,503 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:40:50,504 INFO L85 PathProgramCache]: Analyzing trace with hash 1705656236, now seen corresponding path program 9 times [2021-11-20 23:40:50,504 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:40:50,504 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2135920615] [2021-11-20 23:40:50,504 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:40:50,504 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:40:50,537 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:40:50,766 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 16 proven. 75 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-20 23:40:50,766 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:40:50,766 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2135920615] [2021-11-20 23:40:50,766 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2135920615] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:40:50,766 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2019335163] [2021-11-20 23:40:50,766 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-20 23:40:50,766 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:40:50,767 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a0d2f8-3e8e-41d4-891b-65088d0c913e/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:40:50,768 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a0d2f8-3e8e-41d4-891b-65088d0c913e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:40:50,768 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a0d2f8-3e8e-41d4-891b-65088d0c913e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2021-11-20 23:40:50,849 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-20 23:40:50,850 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:40:50,851 INFO L263 TraceCheckSpWp]: Trace formula consists of 272 conjuncts, 50 conjunts are in the unsatisfiable core [2021-11-20 23:40:50,852 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:40:50,994 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-11-20 23:40:51,166 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 16 proven. 75 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-20 23:40:51,166 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:40:51,259 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 13 [2021-11-20 23:40:51,261 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 22 [2021-11-20 23:40:51,376 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 16 proven. 75 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-20 23:40:51,376 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2019335163] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:40:51,376 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1024083838] [2021-11-20 23:40:51,377 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-20 23:40:51,378 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:40:51,378 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:40:51,378 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:40:51,378 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:40:51,469 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:40:51,471 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-20 23:40:51,622 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 16 [2021-11-20 23:40:51,832 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-20 23:40:51,832 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 194 treesize of output 193 [2021-11-20 23:40:52,360 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:40:52,580 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:40:53,230 INFO L354 Elim1Store]: treesize reduction 22, result has 50.0 percent of original size [2021-11-20 23:40:53,231 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 198 treesize of output 202 [2021-11-20 23:40:54,062 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:40:54,289 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:40:54,453 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 14 treesize of output 10 [2021-11-20 23:40:54,548 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-20 23:40:54,549 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2021-11-20 23:40:58,755 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:41:00,834 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:41:00,834 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:41:00,834 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 18] total 33 [2021-11-20 23:41:00,834 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1209391225] [2021-11-20 23:41:00,834 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:41:00,835 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 33 states [2021-11-20 23:41:00,835 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:41:00,835 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2021-11-20 23:41:00,835 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=169, Invalid=1993, Unknown=0, NotChecked=0, Total=2162 [2021-11-20 23:41:00,835 INFO L87 Difference]: Start difference. First operand 480 states and 545 transitions. Second operand has 33 states, 33 states have (on average 2.4242424242424243) internal successors, (80), 33 states have internal predecessors, (80), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:41:01,806 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:41:01,806 INFO L93 Difference]: Finished difference Result 920 states and 1043 transitions. [2021-11-20 23:41:01,807 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-11-20 23:41:01,807 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 33 states have (on average 2.4242424242424243) internal successors, (80), 33 states have internal predecessors, (80), 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 45 [2021-11-20 23:41:01,807 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:41:01,811 INFO L225 Difference]: With dead ends: 920 [2021-11-20 23:41:01,811 INFO L226 Difference]: Without dead ends: 887 [2021-11-20 23:41:01,812 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 166 GetRequests, 103 SyntacticMatches, 3 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 2 DeprecatedPredicates, 910 ImplicationChecksByTransitivity, 2.9s TimeCoverageRelationStatistics Valid=332, Invalid=3450, Unknown=0, NotChecked=0, Total=3782 [2021-11-20 23:41:01,813 INFO L933 BasicCegarLoop]: 54 mSDtfsCounter, 397 mSDsluCounter, 905 mSDsCounter, 0 mSdLazyCounter, 1363 mSolverCounterSat, 31 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 397 SdHoareTripleChecker+Valid, 697 SdHoareTripleChecker+Invalid, 1478 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 31 IncrementalHoareTripleChecker+Valid, 1363 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 84 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-20 23:41:01,813 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [397 Valid, 697 Invalid, 1478 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [31 Valid, 1363 Invalid, 0 Unknown, 84 Unchecked, 0.6s Time] [2021-11-20 23:41:01,814 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 887 states. [2021-11-20 23:41:01,827 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 887 to 605. [2021-11-20 23:41:01,828 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 605 states, 603 states have (on average 1.1475953565505805) internal successors, (692), 604 states have internal predecessors, (692), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:41:01,830 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 605 states to 605 states and 692 transitions. [2021-11-20 23:41:01,830 INFO L78 Accepts]: Start accepts. Automaton has 605 states and 692 transitions. Word has length 45 [2021-11-20 23:41:01,830 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:41:01,830 INFO L470 AbstractCegarLoop]: Abstraction has 605 states and 692 transitions. [2021-11-20 23:41:01,830 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 33 states, 33 states have (on average 2.4242424242424243) internal successors, (80), 33 states have internal predecessors, (80), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:41:01,831 INFO L276 IsEmpty]: Start isEmpty. Operand 605 states and 692 transitions. [2021-11-20 23:41:01,832 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2021-11-20 23:41:01,832 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:41:01,832 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:41:01,867 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a0d2f8-3e8e-41d4-891b-65088d0c913e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Forceful destruction successful, exit code 0 [2021-11-20 23:41:02,055 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a0d2f8-3e8e-41d4-891b-65088d0c913e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable32 [2021-11-20 23:41:02,055 INFO L402 AbstractCegarLoop]: === Iteration 34 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 15 more)] === [2021-11-20 23:41:02,056 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:41:02,056 INFO L85 PathProgramCache]: Analyzing trace with hash 1606800489, now seen corresponding path program 1 times [2021-11-20 23:41:02,056 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:41:02,056 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [427119315] [2021-11-20 23:41:02,056 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:41:02,056 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:41:02,095 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:41:02,261 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 25 proven. 17 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-20 23:41:02,261 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:41:02,262 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [427119315] [2021-11-20 23:41:02,262 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [427119315] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:41:02,262 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [234914975] [2021-11-20 23:41:02,262 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:41:02,262 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:41:02,262 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a0d2f8-3e8e-41d4-891b-65088d0c913e/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:41:02,263 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a0d2f8-3e8e-41d4-891b-65088d0c913e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:41:02,264 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a0d2f8-3e8e-41d4-891b-65088d0c913e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2021-11-20 23:41:02,324 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:41:02,326 INFO L263 TraceCheckSpWp]: Trace formula consists of 270 conjuncts, 91 conjunts are in the unsatisfiable core [2021-11-20 23:41:02,328 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:41:02,507 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-11-20 23:41:02,554 INFO L354 Elim1Store]: treesize reduction 38, result has 20.8 percent of original size [2021-11-20 23:41:02,555 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 30 treesize of output 29 [2021-11-20 23:41:03,977 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 7 proven. 39 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-20 23:41:03,977 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:41:08,069 INFO L354 Elim1Store]: treesize reduction 65, result has 36.3 percent of original size [2021-11-20 23:41:08,070 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 1348 treesize of output 1049 [2021-11-20 23:41:08,108 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-20 23:41:08,109 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 933 treesize of output 869 [2021-11-20 23:41:16,648 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:41:16,648 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 179 treesize of output 163 [2021-11-20 23:41:16,828 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:41:16,829 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 183 treesize of output 167 [2021-11-20 23:41:17,018 INFO L354 Elim1Store]: treesize reduction 43, result has 63.2 percent of original size [2021-11-20 23:41:17,018 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 5 select indices, 5 select index equivalence classes, 0 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 10 case distinctions, treesize of input 332 treesize of output 296 [2021-11-20 23:41:19,355 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 5 proven. 41 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-20 23:41:19,355 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [234914975] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:41:19,355 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1974357195] [2021-11-20 23:41:19,357 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2021-11-20 23:41:19,357 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:41:19,357 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:41:19,357 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:41:19,357 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:41:19,414 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:41:19,415 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-20 23:41:19,598 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:41:19,838 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:41:19,839 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 200 treesize of output 192 [2021-11-20 23:41:20,392 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:41:20,577 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:41:21,383 INFO L354 Elim1Store]: treesize reduction 22, result has 50.0 percent of original size [2021-11-20 23:41:21,384 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 198 treesize of output 202 [2021-11-20 23:41:22,128 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:41:22,346 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:41:22,610 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 14 treesize of output 10 [2021-11-20 23:41:22,716 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-20 23:41:22,716 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2021-11-20 23:41:38,775 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:41:41,566 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:41:41,566 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:41:41,567 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 20, 22] total 51 [2021-11-20 23:41:41,567 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [106803179] [2021-11-20 23:41:41,567 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:41:41,567 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 52 states [2021-11-20 23:41:41,567 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:41:41,567 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2021-11-20 23:41:41,568 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=272, Invalid=4150, Unknown=0, NotChecked=0, Total=4422 [2021-11-20 23:41:41,568 INFO L87 Difference]: Start difference. First operand 605 states and 692 transitions. Second operand has 52 states, 52 states have (on average 2.3461538461538463) internal successors, (122), 51 states have internal predecessors, (122), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:41:42,371 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:41:42,371 INFO L93 Difference]: Finished difference Result 651 states and 740 transitions. [2021-11-20 23:41:42,371 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-11-20 23:41:42,371 INFO L78 Accepts]: Start accepts. Automaton has has 52 states, 52 states have (on average 2.3461538461538463) internal successors, (122), 51 states have internal predecessors, (122), 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 45 [2021-11-20 23:41:42,371 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:41:42,374 INFO L225 Difference]: With dead ends: 651 [2021-11-20 23:41:42,374 INFO L226 Difference]: Without dead ends: 627 [2021-11-20 23:41:42,375 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 155 GetRequests, 79 SyntacticMatches, 0 SemanticMatches, 76 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1469 ImplicationChecksByTransitivity, 7.2s TimeCoverageRelationStatistics Valid=378, Invalid=5628, Unknown=0, NotChecked=0, Total=6006 [2021-11-20 23:41:42,376 INFO L933 BasicCegarLoop]: 9 mSDtfsCounter, 34 mSDsluCounter, 289 mSDsCounter, 0 mSdLazyCounter, 457 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 34 SdHoareTripleChecker+Valid, 226 SdHoareTripleChecker+Invalid, 605 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 457 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 136 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-20 23:41:42,376 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [34 Valid, 226 Invalid, 605 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 457 Invalid, 0 Unknown, 136 Unchecked, 0.3s Time] [2021-11-20 23:41:42,377 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 627 states. [2021-11-20 23:41:42,387 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 627 to 603. [2021-11-20 23:41:42,388 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 603 states, 601 states have (on average 1.151414309484193) internal successors, (692), 602 states have internal predecessors, (692), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:41:42,390 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 603 states to 603 states and 692 transitions. [2021-11-20 23:41:42,390 INFO L78 Accepts]: Start accepts. Automaton has 603 states and 692 transitions. Word has length 45 [2021-11-20 23:41:42,390 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:41:42,390 INFO L470 AbstractCegarLoop]: Abstraction has 603 states and 692 transitions. [2021-11-20 23:41:42,390 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 52 states, 52 states have (on average 2.3461538461538463) internal successors, (122), 51 states have internal predecessors, (122), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:41:42,391 INFO L276 IsEmpty]: Start isEmpty. Operand 603 states and 692 transitions. [2021-11-20 23:41:42,392 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2021-11-20 23:41:42,392 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:41:42,392 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:41:42,430 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a0d2f8-3e8e-41d4-891b-65088d0c913e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Forceful destruction successful, exit code 0 [2021-11-20 23:41:42,615 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a0d2f8-3e8e-41d4-891b-65088d0c913e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable33 [2021-11-20 23:41:42,615 INFO L402 AbstractCegarLoop]: === Iteration 35 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 15 more)] === [2021-11-20 23:41:42,615 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:41:42,616 INFO L85 PathProgramCache]: Analyzing trace with hash 1110872890, now seen corresponding path program 10 times [2021-11-20 23:41:42,616 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:41:42,616 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [68412861] [2021-11-20 23:41:42,616 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:41:42,616 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:41:42,633 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:41:42,871 INFO L134 CoverageAnalysis]: Checked inductivity of 103 backedges. 16 proven. 86 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-20 23:41:42,871 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:41:42,871 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [68412861] [2021-11-20 23:41:42,871 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [68412861] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:41:42,871 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1893442310] [2021-11-20 23:41:42,871 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-20 23:41:42,871 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:41:42,872 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a0d2f8-3e8e-41d4-891b-65088d0c913e/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:41:42,872 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a0d2f8-3e8e-41d4-891b-65088d0c913e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:41:42,873 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a0d2f8-3e8e-41d4-891b-65088d0c913e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2021-11-20 23:41:42,930 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:41:42,932 INFO L263 TraceCheckSpWp]: Trace formula consists of 282 conjuncts, 45 conjunts are in the unsatisfiable core [2021-11-20 23:41:42,933 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:41:43,222 INFO L134 CoverageAnalysis]: Checked inductivity of 103 backedges. 25 proven. 77 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-20 23:41:43,222 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:41:43,518 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 5 treesize of output 3 [2021-11-20 23:41:43,561 INFO L134 CoverageAnalysis]: Checked inductivity of 103 backedges. 25 proven. 77 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-20 23:41:43,562 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1893442310] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:41:43,562 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1487942696] [2021-11-20 23:41:43,563 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-20 23:41:43,563 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:41:43,563 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:41:43,563 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:41:43,564 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:41:43,651 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:41:43,652 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-20 23:41:43,810 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:41:44,026 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:41:44,027 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 200 treesize of output 192 [2021-11-20 23:41:44,658 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:41:44,890 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:41:45,575 INFO L354 Elim1Store]: treesize reduction 22, result has 50.0 percent of original size [2021-11-20 23:41:45,576 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 198 treesize of output 202 [2021-11-20 23:41:46,453 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:41:46,729 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:41:46,951 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 14 treesize of output 10 [2021-11-20 23:41:47,202 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-20 23:41:47,202 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2021-11-20 23:41:52,090 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:41:54,181 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:41:54,181 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:41:54,182 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 17, 17] total 36 [2021-11-20 23:41:54,182 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [316454347] [2021-11-20 23:41:54,182 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:41:54,182 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 37 states [2021-11-20 23:41:54,182 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:41:54,182 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2021-11-20 23:41:54,183 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=241, Invalid=2309, Unknown=0, NotChecked=0, Total=2550 [2021-11-20 23:41:54,183 INFO L87 Difference]: Start difference. First operand 603 states and 692 transitions. Second operand has 37 states, 36 states have (on average 2.8333333333333335) internal successors, (102), 37 states have internal predecessors, (102), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:41:55,399 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:41:55,399 INFO L93 Difference]: Finished difference Result 1016 states and 1155 transitions. [2021-11-20 23:41:55,399 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-11-20 23:41:55,400 INFO L78 Accepts]: Start accepts. Automaton has has 37 states, 36 states have (on average 2.8333333333333335) internal successors, (102), 37 states have internal predecessors, (102), 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 47 [2021-11-20 23:41:55,400 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:41:55,404 INFO L225 Difference]: With dead ends: 1016 [2021-11-20 23:41:55,404 INFO L226 Difference]: Without dead ends: 1016 [2021-11-20 23:41:55,404 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 170 GetRequests, 104 SyntacticMatches, 2 SemanticMatches, 64 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1206 ImplicationChecksByTransitivity, 2.9s TimeCoverageRelationStatistics Valid=596, Invalid=3694, Unknown=0, NotChecked=0, Total=4290 [2021-11-20 23:41:55,404 INFO L933 BasicCegarLoop]: 29 mSDtfsCounter, 401 mSDsluCounter, 445 mSDsCounter, 0 mSdLazyCounter, 1775 mSolverCounterSat, 38 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 401 SdHoareTripleChecker+Valid, 334 SdHoareTripleChecker+Invalid, 1813 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 38 IncrementalHoareTripleChecker+Valid, 1775 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2021-11-20 23:41:55,405 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [401 Valid, 334 Invalid, 1813 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [38 Valid, 1775 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2021-11-20 23:41:55,406 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1016 states. [2021-11-20 23:41:55,421 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1016 to 729. [2021-11-20 23:41:55,422 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 729 states, 727 states have (on average 1.1623108665749655) internal successors, (845), 728 states have internal predecessors, (845), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:41:55,424 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 729 states to 729 states and 845 transitions. [2021-11-20 23:41:55,424 INFO L78 Accepts]: Start accepts. Automaton has 729 states and 845 transitions. Word has length 47 [2021-11-20 23:41:55,424 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:41:55,424 INFO L470 AbstractCegarLoop]: Abstraction has 729 states and 845 transitions. [2021-11-20 23:41:55,425 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 37 states, 36 states have (on average 2.8333333333333335) internal successors, (102), 37 states have internal predecessors, (102), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:41:55,425 INFO L276 IsEmpty]: Start isEmpty. Operand 729 states and 845 transitions. [2021-11-20 23:41:55,426 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2021-11-20 23:41:55,426 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:41:55,426 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:41:55,463 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a0d2f8-3e8e-41d4-891b-65088d0c913e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Forceful destruction successful, exit code 0 [2021-11-20 23:41:55,651 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a0d2f8-3e8e-41d4-891b-65088d0c913e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable34 [2021-11-20 23:41:55,651 INFO L402 AbstractCegarLoop]: === Iteration 36 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 15 more)] === [2021-11-20 23:41:55,651 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:41:55,651 INFO L85 PathProgramCache]: Analyzing trace with hash -1932208695, now seen corresponding path program 2 times [2021-11-20 23:41:55,652 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:41:55,652 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [479279693] [2021-11-20 23:41:55,652 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:41:55,652 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:41:55,684 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:41:56,117 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 3 proven. 48 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-20 23:41:56,117 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:41:56,117 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [479279693] [2021-11-20 23:41:56,117 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [479279693] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:41:56,118 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [969747542] [2021-11-20 23:41:56,118 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-20 23:41:56,118 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:41:56,118 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a0d2f8-3e8e-41d4-891b-65088d0c913e/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:41:56,119 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a0d2f8-3e8e-41d4-891b-65088d0c913e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:41:56,120 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a0d2f8-3e8e-41d4-891b-65088d0c913e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2021-11-20 23:41:56,193 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-11-20 23:41:56,193 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:41:56,195 INFO L263 TraceCheckSpWp]: Trace formula consists of 280 conjuncts, 45 conjunts are in the unsatisfiable core [2021-11-20 23:41:56,196 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:41:56,201 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-11-20 23:41:56,398 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-11-20 23:41:56,449 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-20 23:41:56,449 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 35 treesize of output 34 [2021-11-20 23:41:57,575 INFO L354 Elim1Store]: treesize reduction 61, result has 29.9 percent of original size [2021-11-20 23:41:57,575 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 53 treesize of output 52 [2021-11-20 23:41:57,611 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 3 proven. 39 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2021-11-20 23:41:57,611 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:42:01,404 WARN L838 $PredicateComparison]: unable to prove that (forall ((|ULTIMATE.start_cstrpbrk_~s~0#1.offset| Int) (|ULTIMATE.start_main_~nondetString2~0#1.offset| Int) (|ULTIMATE.start_main_~length2~0#1| Int) (|ULTIMATE.start_cstrpbrk_~s~0#1.base| Int)) (let ((.cse1 (store |c_#memory_int| |c_ULTIMATE.start_main_~nondetString2~0#1.base| (store (select |c_#memory_int| |c_ULTIMATE.start_main_~nondetString2~0#1.base|) (+ (- 1) |ULTIMATE.start_main_~nondetString2~0#1.offset| |ULTIMATE.start_main_~length2~0#1|) 0)))) (let ((.cse0 (select (select .cse1 |ULTIMATE.start_cstrpbrk_~s~0#1.base|) |ULTIMATE.start_cstrpbrk_~s~0#1.offset|))) (or (not (= .cse0 (select (select .cse1 |c_ULTIMATE.start_main_~nondetString1~0#1.base|) (+ |c_ULTIMATE.start_main_~nondetString1~0#1.offset| 2)))) (= .cse0 0))))) is different from false [2021-11-20 23:42:01,415 INFO L354 Elim1Store]: treesize reduction 12, result has 7.7 percent of original size [2021-11-20 23:42:01,416 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 412 treesize of output 368 [2021-11-20 23:42:01,674 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 3 proven. 39 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2021-11-20 23:42:01,674 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [969747542] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:42:01,675 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1459749019] [2021-11-20 23:42:01,676 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2021-11-20 23:42:01,676 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:42:01,676 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:42:01,677 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:42:01,677 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:42:01,765 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:42:01,766 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-20 23:42:01,870 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 16 [2021-11-20 23:42:02,109 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-20 23:42:02,110 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 194 treesize of output 193 [2021-11-20 23:42:02,706 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:42:02,958 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:42:03,835 INFO L354 Elim1Store]: treesize reduction 28, result has 44.0 percent of original size [2021-11-20 23:42:03,836 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 204 treesize of output 208 [2021-11-20 23:42:05,111 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:42:05,250 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:42:05,443 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 14 treesize of output 10 [2021-11-20 23:42:05,530 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-20 23:42:05,531 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2021-11-20 23:42:20,978 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:42:23,475 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:42:23,476 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:42:23,476 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 14, 14] total 44 [2021-11-20 23:42:23,476 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [719396696] [2021-11-20 23:42:23,476 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:42:23,476 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 45 states [2021-11-20 23:42:23,476 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:42:23,477 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 45 interpolants. [2021-11-20 23:42:23,477 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=207, Invalid=3215, Unknown=4, NotChecked=114, Total=3540 [2021-11-20 23:42:23,477 INFO L87 Difference]: Start difference. First operand 729 states and 845 transitions. Second operand has 45 states, 45 states have (on average 2.6222222222222222) internal successors, (118), 44 states have internal predecessors, (118), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:42:32,936 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:42:32,936 INFO L93 Difference]: Finished difference Result 884 states and 1017 transitions. [2021-11-20 23:42:32,936 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-11-20 23:42:32,936 INFO L78 Accepts]: Start accepts. Automaton has has 45 states, 45 states have (on average 2.6222222222222222) internal successors, (118), 44 states have internal predecessors, (118), 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 47 [2021-11-20 23:42:32,936 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:42:32,939 INFO L225 Difference]: With dead ends: 884 [2021-11-20 23:42:32,939 INFO L226 Difference]: Without dead ends: 878 [2021-11-20 23:42:32,940 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 180 GetRequests, 101 SyntacticMatches, 2 SemanticMatches, 77 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 1196 ImplicationChecksByTransitivity, 16.2s TimeCoverageRelationStatistics Valid=384, Invalid=5621, Unknown=5, NotChecked=152, Total=6162 [2021-11-20 23:42:32,940 INFO L933 BasicCegarLoop]: 8 mSDtfsCounter, 72 mSDsluCounter, 256 mSDsCounter, 0 mSdLazyCounter, 411 mSolverCounterSat, 31 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 72 SdHoareTripleChecker+Valid, 213 SdHoareTripleChecker+Invalid, 690 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 31 IncrementalHoareTripleChecker+Valid, 411 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 248 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-20 23:42:32,941 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [72 Valid, 213 Invalid, 690 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [31 Valid, 411 Invalid, 0 Unknown, 248 Unchecked, 0.2s Time] [2021-11-20 23:42:32,942 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 878 states. [2021-11-20 23:42:32,954 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 878 to 853. [2021-11-20 23:42:32,955 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 853 states, 851 states have (on average 1.1598119858989424) internal successors, (987), 852 states have internal predecessors, (987), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:42:32,957 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 853 states to 853 states and 987 transitions. [2021-11-20 23:42:32,957 INFO L78 Accepts]: Start accepts. Automaton has 853 states and 987 transitions. Word has length 47 [2021-11-20 23:42:32,957 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:42:32,957 INFO L470 AbstractCegarLoop]: Abstraction has 853 states and 987 transitions. [2021-11-20 23:42:32,958 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 45 states, 45 states have (on average 2.6222222222222222) internal successors, (118), 44 states have internal predecessors, (118), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:42:32,958 INFO L276 IsEmpty]: Start isEmpty. Operand 853 states and 987 transitions. [2021-11-20 23:42:32,959 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2021-11-20 23:42:32,959 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:42:32,960 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 5, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1] [2021-11-20 23:42:32,990 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a0d2f8-3e8e-41d4-891b-65088d0c913e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Forceful destruction successful, exit code 0 [2021-11-20 23:42:33,175 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable35,22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a0d2f8-3e8e-41d4-891b-65088d0c913e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:42:33,175 INFO L402 AbstractCegarLoop]: === Iteration 37 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 15 more)] === [2021-11-20 23:42:33,175 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:42:33,175 INFO L85 PathProgramCache]: Analyzing trace with hash 221024386, now seen corresponding path program 3 times [2021-11-20 23:42:33,176 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:42:33,176 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [265024686] [2021-11-20 23:42:33,176 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:42:33,176 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:42:33,195 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:42:33,360 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 33 proven. 21 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-20 23:42:33,361 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:42:33,361 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [265024686] [2021-11-20 23:42:33,361 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [265024686] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:42:33,361 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1812235663] [2021-11-20 23:42:33,361 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-20 23:42:33,361 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:42:33,361 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a0d2f8-3e8e-41d4-891b-65088d0c913e/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:42:33,362 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a0d2f8-3e8e-41d4-891b-65088d0c913e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:42:33,382 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a0d2f8-3e8e-41d4-891b-65088d0c913e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2021-11-20 23:42:33,455 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-20 23:42:33,455 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:42:33,457 INFO L263 TraceCheckSpWp]: Trace formula consists of 290 conjuncts, 75 conjunts are in the unsatisfiable core [2021-11-20 23:42:33,459 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:42:33,466 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-11-20 23:42:33,675 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-11-20 23:42:33,726 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 30 treesize of output 29 [2021-11-20 23:42:34,993 INFO L354 Elim1Store]: treesize reduction 72, result has 10.0 percent of original size [2021-11-20 23:42:34,993 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 52 treesize of output 34 [2021-11-20 23:42:35,023 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 3 proven. 59 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-20 23:42:35,024 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:42:36,206 WARN L838 $PredicateComparison]: unable to prove that (forall ((|ULTIMATE.start_main_~length2~0#1| Int)) (let ((.cse1 (store (select |c_#memory_int| |c_ULTIMATE.start_main_~nondetString2~0#1.base|) (+ (- 1) |c_ULTIMATE.start_main_~nondetString2~0#1.offset| |ULTIMATE.start_main_~length2~0#1|) 0))) (let ((.cse0 (select .cse1 (+ |c_ULTIMATE.start_main_~nondetString2~0#1.offset| 1)))) (or (= .cse0 0) (not (= (select (select (store |c_#memory_int| |c_ULTIMATE.start_main_~nondetString2~0#1.base| .cse1) |c_ULTIMATE.start_main_~nondetString1~0#1.base|) (+ |c_ULTIMATE.start_main_~nondetString1~0#1.offset| 2)) .cse0)))))) is different from false [2021-11-20 23:42:36,229 INFO L354 Elim1Store]: treesize reduction 29, result has 43.1 percent of original size [2021-11-20 23:42:36,230 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 217 treesize of output 177 [2021-11-20 23:42:36,236 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-20 23:42:36,236 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 173 treesize of output 167 [2021-11-20 23:42:36,312 INFO L354 Elim1Store]: treesize reduction 10, result has 23.1 percent of original size [2021-11-20 23:42:36,312 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 28 treesize of output 22 [2021-11-20 23:42:36,383 INFO L354 Elim1Store]: treesize reduction 13, result has 66.7 percent of original size [2021-11-20 23:42:36,384 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 84 treesize of output 88 [2021-11-20 23:42:36,602 INFO L134 CoverageAnalysis]: Checked inductivity of 66 backedges. 5 proven. 57 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-20 23:42:36,602 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1812235663] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:42:36,602 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1553004950] [2021-11-20 23:42:36,603 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2021-11-20 23:42:36,604 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:42:36,604 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:42:36,604 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:42:36,604 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:42:36,685 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:42:36,687 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-20 23:42:36,854 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 20 treesize of output 16 [2021-11-20 23:42:37,016 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-20 23:42:37,017 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 194 treesize of output 193 [2021-11-20 23:42:37,644 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:42:37,804 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:42:38,378 INFO L354 Elim1Store]: treesize reduction 22, result has 50.0 percent of original size [2021-11-20 23:42:38,378 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 198 treesize of output 202 [2021-11-20 23:42:39,400 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:42:39,636 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:42:39,896 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 14 treesize of output 10 [2021-11-20 23:42:40,039 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-20 23:42:40,039 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2021-11-20 23:42:55,149 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:42:57,667 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:42:57,667 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:42:57,667 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 18, 18] total 45 [2021-11-20 23:42:57,668 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [566994861] [2021-11-20 23:42:57,668 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:42:57,668 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 46 states [2021-11-20 23:42:57,668 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:42:57,669 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2021-11-20 23:42:57,669 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=206, Invalid=3337, Unknown=1, NotChecked=116, Total=3660 [2021-11-20 23:42:57,669 INFO L87 Difference]: Start difference. First operand 853 states and 987 transitions. Second operand has 46 states, 46 states have (on average 2.891304347826087) internal successors, (133), 45 states have internal predecessors, (133), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:42:58,407 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:42:58,407 INFO L93 Difference]: Finished difference Result 923 states and 1055 transitions. [2021-11-20 23:42:58,408 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-11-20 23:42:58,408 INFO L78 Accepts]: Start accepts. Automaton has has 46 states, 46 states have (on average 2.891304347826087) internal successors, (133), 45 states have internal predecessors, (133), 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 49 [2021-11-20 23:42:58,408 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:42:58,410 INFO L225 Difference]: With dead ends: 923 [2021-11-20 23:42:58,410 INFO L226 Difference]: Without dead ends: 794 [2021-11-20 23:42:58,411 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 173 GetRequests, 99 SyntacticMatches, 0 SemanticMatches, 74 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 1173 ImplicationChecksByTransitivity, 4.9s TimeCoverageRelationStatistics Valid=334, Invalid=5219, Unknown=1, NotChecked=146, Total=5700 [2021-11-20 23:42:58,411 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 65 mSDsluCounter, 296 mSDsCounter, 0 mSdLazyCounter, 385 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 65 SdHoareTripleChecker+Valid, 240 SdHoareTripleChecker+Invalid, 596 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 385 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 198 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-20 23:42:58,411 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [65 Valid, 240 Invalid, 596 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 385 Invalid, 0 Unknown, 198 Unchecked, 0.2s Time] [2021-11-20 23:42:58,412 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 794 states. [2021-11-20 23:42:58,423 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 794 to 673. [2021-11-20 23:42:58,424 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 673 states, 671 states have (on average 1.1684053651266766) internal successors, (784), 672 states have internal predecessors, (784), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:42:58,425 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 673 states to 673 states and 784 transitions. [2021-11-20 23:42:58,426 INFO L78 Accepts]: Start accepts. Automaton has 673 states and 784 transitions. Word has length 49 [2021-11-20 23:42:58,426 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:42:58,426 INFO L470 AbstractCegarLoop]: Abstraction has 673 states and 784 transitions. [2021-11-20 23:42:58,426 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 46 states, 46 states have (on average 2.891304347826087) internal successors, (133), 45 states have internal predecessors, (133), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:42:58,426 INFO L276 IsEmpty]: Start isEmpty. Operand 673 states and 784 transitions. [2021-11-20 23:42:58,428 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2021-11-20 23:42:58,428 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:42:58,428 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 6, 5, 4, 4, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:42:58,463 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a0d2f8-3e8e-41d4-891b-65088d0c913e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Forceful destruction successful, exit code 0 [2021-11-20 23:42:58,655 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a0d2f8-3e8e-41d4-891b-65088d0c913e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable36 [2021-11-20 23:42:58,655 INFO L402 AbstractCegarLoop]: === Iteration 38 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 15 more)] === [2021-11-20 23:42:58,655 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:42:58,655 INFO L85 PathProgramCache]: Analyzing trace with hash -1671404766, now seen corresponding path program 2 times [2021-11-20 23:42:58,655 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:42:58,655 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2038101408] [2021-11-20 23:42:58,656 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:42:58,656 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:42:58,676 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:42:58,871 INFO L134 CoverageAnalysis]: Checked inductivity of 89 backedges. 16 proven. 67 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-20 23:42:58,872 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:42:58,872 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2038101408] [2021-11-20 23:42:58,872 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2038101408] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:42:58,872 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2140320480] [2021-11-20 23:42:58,872 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-20 23:42:58,872 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:42:58,872 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a0d2f8-3e8e-41d4-891b-65088d0c913e/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:42:58,873 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a0d2f8-3e8e-41d4-891b-65088d0c913e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:42:58,902 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a0d2f8-3e8e-41d4-891b-65088d0c913e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Waiting until timeout for monitored process [2021-11-20 23:42:59,032 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2021-11-20 23:42:59,032 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:42:59,035 INFO L263 TraceCheckSpWp]: Trace formula consists of 297 conjuncts, 42 conjunts are in the unsatisfiable core [2021-11-20 23:42:59,036 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:42:59,049 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-20 23:42:59,049 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 1 case distinctions, treesize of input 9 treesize of output 15 [2021-11-20 23:42:59,299 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:42:59,818 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-20 23:42:59,818 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 42 treesize of output 38 [2021-11-20 23:42:59,977 INFO L134 CoverageAnalysis]: Checked inductivity of 89 backedges. 9 proven. 74 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-20 23:42:59,978 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:43:00,709 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 29 treesize of output 27 [2021-11-20 23:43:00,710 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 35 treesize of output 33 [2021-11-20 23:43:01,262 INFO L134 CoverageAnalysis]: Checked inductivity of 89 backedges. 16 proven. 67 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-20 23:43:01,262 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2140320480] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:43:01,262 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1984937442] [2021-11-20 23:43:01,264 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2021-11-20 23:43:01,264 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:43:01,264 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:43:01,264 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:43:01,264 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:43:01,309 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:01,309 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-20 23:43:01,481 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:43:01,657 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:01,657 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 200 treesize of output 192 [2021-11-20 23:43:02,115 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:43:02,333 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:43:03,086 INFO L354 Elim1Store]: treesize reduction 28, result has 44.0 percent of original size [2021-11-20 23:43:03,086 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 204 treesize of output 208 [2021-11-20 23:43:04,231 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:43:04,529 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:43:04,640 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 14 treesize of output 10 [2021-11-20 23:43:04,820 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-20 23:43:04,820 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2021-11-20 23:43:20,340 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:43:22,937 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:43:22,937 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:43:22,937 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 16] total 48 [2021-11-20 23:43:22,937 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [786903229] [2021-11-20 23:43:22,937 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:43:22,938 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 49 states [2021-11-20 23:43:22,938 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:43:22,938 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2021-11-20 23:43:22,939 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=306, Invalid=3726, Unknown=0, NotChecked=0, Total=4032 [2021-11-20 23:43:22,939 INFO L87 Difference]: Start difference. First operand 673 states and 784 transitions. Second operand has 49 states, 49 states have (on average 2.877551020408163) internal successors, (141), 48 states have internal predecessors, (141), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:43:24,813 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:43:24,813 INFO L93 Difference]: Finished difference Result 964 states and 1102 transitions. [2021-11-20 23:43:24,813 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2021-11-20 23:43:24,813 INFO L78 Accepts]: Start accepts. Automaton has has 49 states, 49 states have (on average 2.877551020408163) internal successors, (141), 48 states have internal predecessors, (141), 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 50 [2021-11-20 23:43:24,813 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:43:24,816 INFO L225 Difference]: With dead ends: 964 [2021-11-20 23:43:24,816 INFO L226 Difference]: Without dead ends: 909 [2021-11-20 23:43:24,817 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 217 GetRequests, 115 SyntacticMatches, 2 SemanticMatches, 100 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2935 ImplicationChecksByTransitivity, 5.1s TimeCoverageRelationStatistics Valid=931, Invalid=9371, Unknown=0, NotChecked=0, Total=10302 [2021-11-20 23:43:24,817 INFO L933 BasicCegarLoop]: 22 mSDtfsCounter, 369 mSDsluCounter, 375 mSDsCounter, 0 mSdLazyCounter, 909 mSolverCounterSat, 29 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 369 SdHoareTripleChecker+Valid, 322 SdHoareTripleChecker+Invalid, 1098 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 29 IncrementalHoareTripleChecker+Valid, 909 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 160 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-20 23:43:24,818 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [369 Valid, 322 Invalid, 1098 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [29 Valid, 909 Invalid, 0 Unknown, 160 Unchecked, 0.4s Time] [2021-11-20 23:43:24,818 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 909 states. [2021-11-20 23:43:24,830 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 909 to 685. [2021-11-20 23:43:24,831 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 685 states, 683 states have (on average 1.1669106881405564) internal successors, (797), 684 states have internal predecessors, (797), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:43:24,833 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 685 states to 685 states and 797 transitions. [2021-11-20 23:43:24,833 INFO L78 Accepts]: Start accepts. Automaton has 685 states and 797 transitions. Word has length 50 [2021-11-20 23:43:24,833 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:43:24,833 INFO L470 AbstractCegarLoop]: Abstraction has 685 states and 797 transitions. [2021-11-20 23:43:24,834 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 49 states, 49 states have (on average 2.877551020408163) internal successors, (141), 48 states have internal predecessors, (141), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:43:24,834 INFO L276 IsEmpty]: Start isEmpty. Operand 685 states and 797 transitions. [2021-11-20 23:43:24,835 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2021-11-20 23:43:24,835 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:43:24,835 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:43:24,878 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a0d2f8-3e8e-41d4-891b-65088d0c913e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Forceful destruction successful, exit code 0 [2021-11-20 23:43:25,059 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a0d2f8-3e8e-41d4-891b-65088d0c913e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable37 [2021-11-20 23:43:25,059 INFO L402 AbstractCegarLoop]: === Iteration 39 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 15 more)] === [2021-11-20 23:43:25,059 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:43:25,059 INFO L85 PathProgramCache]: Analyzing trace with hash -928527393, now seen corresponding path program 7 times [2021-11-20 23:43:25,060 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:43:25,060 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1049333301] [2021-11-20 23:43:25,060 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:43:25,060 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:43:25,082 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:43:25,454 INFO L134 CoverageAnalysis]: Checked inductivity of 68 backedges. 4 proven. 63 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-20 23:43:25,455 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:43:25,455 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1049333301] [2021-11-20 23:43:25,455 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1049333301] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:43:25,455 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [434420405] [2021-11-20 23:43:25,455 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-20 23:43:25,455 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:43:25,455 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a0d2f8-3e8e-41d4-891b-65088d0c913e/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:43:25,456 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a0d2f8-3e8e-41d4-891b-65088d0c913e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:43:25,458 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a0d2f8-3e8e-41d4-891b-65088d0c913e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Waiting until timeout for monitored process [2021-11-20 23:43:25,546 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:43:25,549 INFO L263 TraceCheckSpWp]: Trace formula consists of 295 conjuncts, 77 conjunts are in the unsatisfiable core [2021-11-20 23:43:25,551 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:43:25,560 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-11-20 23:43:25,784 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-11-20 23:43:25,840 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 30 treesize of output 29 [2021-11-20 23:43:27,468 INFO L354 Elim1Store]: treesize reduction 125, result has 6.0 percent of original size [2021-11-20 23:43:27,468 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 5 select indices, 5 select index equivalence classes, 0 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 10 case distinctions, treesize of input 65 treesize of output 37 [2021-11-20 23:43:27,505 INFO L134 CoverageAnalysis]: Checked inductivity of 68 backedges. 4 proven. 63 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-20 23:43:27,505 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:43:29,096 INFO L354 Elim1Store]: treesize reduction 62, result has 32.6 percent of original size [2021-11-20 23:43:29,096 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 375 treesize of output 295 [2021-11-20 23:43:29,103 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-20 23:43:29,104 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 287 treesize of output 271 [2021-11-20 23:43:29,360 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:43:29,369 INFO L354 Elim1Store]: treesize reduction 18, result has 28.0 percent of original size [2021-11-20 23:43:29,369 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 40 treesize of output 35 [2021-11-20 23:43:29,481 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:43:29,511 INFO L354 Elim1Store]: treesize reduction 17, result has 68.5 percent of original size [2021-11-20 23:43:29,512 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 4 select indices, 4 select index equivalence classes, 1 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 5 case distinctions, treesize of input 105 treesize of output 118 [2021-11-20 23:43:29,910 INFO L134 CoverageAnalysis]: Checked inductivity of 68 backedges. 13 proven. 54 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-20 23:43:29,911 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [434420405] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:43:29,911 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1260969256] [2021-11-20 23:43:29,912 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2021-11-20 23:43:29,912 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:43:29,912 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:43:29,912 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:43:29,912 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:43:30,009 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:30,011 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-20 23:43:30,174 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:43:30,394 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:30,395 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 200 treesize of output 192 [2021-11-20 23:43:30,982 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:43:31,275 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:43:32,249 INFO L354 Elim1Store]: treesize reduction 22, result has 50.0 percent of original size [2021-11-20 23:43:32,250 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 198 treesize of output 202 [2021-11-20 23:43:33,587 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:43:33,992 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:43:34,172 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 14 treesize of output 10 [2021-11-20 23:43:34,267 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-20 23:43:34,268 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2021-11-20 23:43:43,959 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:43:47,022 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:43:47,023 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:43:47,023 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 20, 20] total 51 [2021-11-20 23:43:47,023 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [253137058] [2021-11-20 23:43:47,023 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:43:47,023 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 52 states [2021-11-20 23:43:47,023 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:43:47,024 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2021-11-20 23:43:47,024 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=257, Invalid=4165, Unknown=0, NotChecked=0, Total=4422 [2021-11-20 23:43:47,024 INFO L87 Difference]: Start difference. First operand 685 states and 797 transitions. Second operand has 52 states, 52 states have (on average 2.326923076923077) internal successors, (121), 51 states have internal predecessors, (121), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:43:48,065 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:43:48,065 INFO L93 Difference]: Finished difference Result 930 states and 1063 transitions. [2021-11-20 23:43:48,065 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-11-20 23:43:48,065 INFO L78 Accepts]: Start accepts. Automaton has has 52 states, 52 states have (on average 2.326923076923077) internal successors, (121), 51 states have internal predecessors, (121), 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 50 [2021-11-20 23:43:48,065 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:43:48,069 INFO L225 Difference]: With dead ends: 930 [2021-11-20 23:43:48,070 INFO L226 Difference]: Without dead ends: 882 [2021-11-20 23:43:48,071 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 183 GetRequests, 102 SyntacticMatches, 1 SemanticMatches, 80 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1343 ImplicationChecksByTransitivity, 6.6s TimeCoverageRelationStatistics Valid=414, Invalid=6228, Unknown=0, NotChecked=0, Total=6642 [2021-11-20 23:43:48,071 INFO L933 BasicCegarLoop]: 9 mSDtfsCounter, 52 mSDsluCounter, 280 mSDsCounter, 0 mSdLazyCounter, 407 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 52 SdHoareTripleChecker+Valid, 217 SdHoareTripleChecker+Invalid, 533 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 407 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 114 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-20 23:43:48,071 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [52 Valid, 217 Invalid, 533 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 407 Invalid, 0 Unknown, 114 Unchecked, 0.2s Time] [2021-11-20 23:43:48,073 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 882 states. [2021-11-20 23:43:48,086 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 882 to 880. [2021-11-20 23:43:48,087 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 880 states, 878 states have (on average 1.15375854214123) internal successors, (1013), 879 states have internal predecessors, (1013), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:43:48,089 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 880 states to 880 states and 1013 transitions. [2021-11-20 23:43:48,089 INFO L78 Accepts]: Start accepts. Automaton has 880 states and 1013 transitions. Word has length 50 [2021-11-20 23:43:48,089 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:43:48,090 INFO L470 AbstractCegarLoop]: Abstraction has 880 states and 1013 transitions. [2021-11-20 23:43:48,090 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 52 states, 52 states have (on average 2.326923076923077) internal successors, (121), 51 states have internal predecessors, (121), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:43:48,090 INFO L276 IsEmpty]: Start isEmpty. Operand 880 states and 1013 transitions. [2021-11-20 23:43:48,092 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2021-11-20 23:43:48,092 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:43:48,092 INFO L514 BasicCegarLoop]: trace histogram [7, 7, 7, 7, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:43:48,129 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a0d2f8-3e8e-41d4-891b-65088d0c913e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Forceful destruction successful, exit code 0 [2021-11-20 23:43:48,307 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable38,25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a0d2f8-3e8e-41d4-891b-65088d0c913e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:43:48,307 INFO L402 AbstractCegarLoop]: === Iteration 40 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 15 more)] === [2021-11-20 23:43:48,307 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:43:48,307 INFO L85 PathProgramCache]: Analyzing trace with hash 1416363073, now seen corresponding path program 11 times [2021-11-20 23:43:48,308 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:43:48,308 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [186495333] [2021-11-20 23:43:48,308 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:43:48,308 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:43:48,328 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:43:48,603 INFO L134 CoverageAnalysis]: Checked inductivity of 128 backedges. 19 proven. 108 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-20 23:43:48,603 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:43:48,603 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [186495333] [2021-11-20 23:43:48,603 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [186495333] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:43:48,603 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1236501664] [2021-11-20 23:43:48,603 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-20 23:43:48,604 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:43:48,604 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a0d2f8-3e8e-41d4-891b-65088d0c913e/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:43:48,607 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a0d2f8-3e8e-41d4-891b-65088d0c913e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:43:48,630 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a0d2f8-3e8e-41d4-891b-65088d0c913e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Waiting until timeout for monitored process [2021-11-20 23:43:48,792 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2021-11-20 23:43:48,793 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:43:48,795 INFO L263 TraceCheckSpWp]: Trace formula consists of 302 conjuncts, 60 conjunts are in the unsatisfiable core [2021-11-20 23:43:48,796 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:43:48,967 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-11-20 23:43:49,162 INFO L134 CoverageAnalysis]: Checked inductivity of 128 backedges. 19 proven. 108 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-20 23:43:49,162 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:43:49,270 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 13 [2021-11-20 23:43:49,277 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 22 [2021-11-20 23:43:49,409 INFO L134 CoverageAnalysis]: Checked inductivity of 128 backedges. 19 proven. 108 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-20 23:43:49,409 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1236501664] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:43:49,409 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1020880407] [2021-11-20 23:43:49,410 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-20 23:43:49,410 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:43:49,410 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:43:49,411 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:43:49,411 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:43:49,446 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:49,447 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-20 23:43:49,707 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:43:49,838 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:43:49,839 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 200 treesize of output 192 [2021-11-20 23:43:50,319 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:43:50,530 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:43:51,303 INFO L354 Elim1Store]: treesize reduction 22, result has 50.0 percent of original size [2021-11-20 23:43:51,303 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 198 treesize of output 202 [2021-11-20 23:43:52,654 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:43:52,872 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:43:53,182 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 14 treesize of output 10 [2021-11-20 23:43:53,237 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-20 23:43:53,237 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2021-11-20 23:43:57,651 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:43:59,885 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:43:59,885 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:43:59,885 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20, 20] total 37 [2021-11-20 23:43:59,885 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1782966590] [2021-11-20 23:43:59,885 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:43:59,886 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 37 states [2021-11-20 23:43:59,886 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:43:59,886 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 37 interpolants. [2021-11-20 23:43:59,886 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=181, Invalid=2369, Unknown=0, NotChecked=0, Total=2550 [2021-11-20 23:43:59,887 INFO L87 Difference]: Start difference. First operand 880 states and 1013 transitions. Second operand has 37 states, 37 states have (on average 2.4324324324324325) internal successors, (90), 37 states have internal predecessors, (90), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:44:01,298 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:44:01,298 INFO L93 Difference]: Finished difference Result 1417 states and 1605 transitions. [2021-11-20 23:44:01,298 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-11-20 23:44:01,298 INFO L78 Accepts]: Start accepts. Automaton has has 37 states, 37 states have (on average 2.4324324324324325) internal successors, (90), 37 states have internal predecessors, (90), 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 51 [2021-11-20 23:44:01,299 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:44:01,303 INFO L225 Difference]: With dead ends: 1417 [2021-11-20 23:44:01,303 INFO L226 Difference]: Without dead ends: 1323 [2021-11-20 23:44:01,303 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 188 GetRequests, 119 SyntacticMatches, 3 SemanticMatches, 66 ConstructedPredicates, 0 IntricatePredicates, 2 DeprecatedPredicates, 1084 ImplicationChecksByTransitivity, 3.3s TimeCoverageRelationStatistics Valid=392, Invalid=4164, Unknown=0, NotChecked=0, Total=4556 [2021-11-20 23:44:01,304 INFO L933 BasicCegarLoop]: 62 mSDtfsCounter, 416 mSDsluCounter, 1117 mSDsCounter, 0 mSdLazyCounter, 2002 mSolverCounterSat, 40 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 416 SdHoareTripleChecker+Valid, 842 SdHoareTripleChecker+Invalid, 2042 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 40 IncrementalHoareTripleChecker+Valid, 2002 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2021-11-20 23:44:01,304 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [416 Valid, 842 Invalid, 2042 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [40 Valid, 2002 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2021-11-20 23:44:01,305 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1323 states. [2021-11-20 23:44:01,322 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1323 to 1043. [2021-11-20 23:44:01,323 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1043 states, 1041 states have (on average 1.1546589817483188) internal successors, (1202), 1042 states have internal predecessors, (1202), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:44:01,326 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1043 states to 1043 states and 1202 transitions. [2021-11-20 23:44:01,326 INFO L78 Accepts]: Start accepts. Automaton has 1043 states and 1202 transitions. Word has length 51 [2021-11-20 23:44:01,327 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:44:01,327 INFO L470 AbstractCegarLoop]: Abstraction has 1043 states and 1202 transitions. [2021-11-20 23:44:01,327 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 37 states, 37 states have (on average 2.4324324324324325) internal successors, (90), 37 states have internal predecessors, (90), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:44:01,327 INFO L276 IsEmpty]: Start isEmpty. Operand 1043 states and 1202 transitions. [2021-11-20 23:44:01,329 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2021-11-20 23:44:01,329 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:44:01,330 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:44:01,370 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a0d2f8-3e8e-41d4-891b-65088d0c913e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Forceful destruction successful, exit code 0 [2021-11-20 23:44:01,543 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a0d2f8-3e8e-41d4-891b-65088d0c913e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable39 [2021-11-20 23:44:01,543 INFO L402 AbstractCegarLoop]: === Iteration 41 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 15 more)] === [2021-11-20 23:44:01,543 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:44:01,543 INFO L85 PathProgramCache]: Analyzing trace with hash 527726549, now seen corresponding path program 8 times [2021-11-20 23:44:01,544 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:44:01,544 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [239438493] [2021-11-20 23:44:01,544 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:44:01,544 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:44:01,559 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:44:01,723 INFO L134 CoverageAnalysis]: Checked inductivity of 75 backedges. 4 proven. 70 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-20 23:44:01,724 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:44:01,724 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [239438493] [2021-11-20 23:44:01,724 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [239438493] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:44:01,724 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1027905701] [2021-11-20 23:44:01,724 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-20 23:44:01,724 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:44:01,724 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a0d2f8-3e8e-41d4-891b-65088d0c913e/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:44:01,725 INFO L229 MonitoredProcess]: Starting monitored process 27 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a0d2f8-3e8e-41d4-891b-65088d0c913e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:44:01,747 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a0d2f8-3e8e-41d4-891b-65088d0c913e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Waiting until timeout for monitored process [2021-11-20 23:44:01,823 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2021-11-20 23:44:01,823 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:44:01,825 INFO L263 TraceCheckSpWp]: Trace formula consists of 305 conjuncts, 32 conjunts are in the unsatisfiable core [2021-11-20 23:44:01,826 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:44:02,083 INFO L134 CoverageAnalysis]: Checked inductivity of 75 backedges. 9 proven. 65 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-20 23:44:02,083 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:44:02,395 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 5 [2021-11-20 23:44:02,436 INFO L134 CoverageAnalysis]: Checked inductivity of 75 backedges. 9 proven. 65 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-20 23:44:02,436 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1027905701] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:44:02,436 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [825202786] [2021-11-20 23:44:02,437 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2021-11-20 23:44:02,437 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:44:02,438 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:44:02,438 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:44:02,438 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:44:02,486 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:44:02,486 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-20 23:44:02,657 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:44:02,838 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:44:02,839 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 200 treesize of output 192 [2021-11-20 23:44:03,376 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:44:03,512 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:44:04,142 INFO L354 Elim1Store]: treesize reduction 22, result has 50.0 percent of original size [2021-11-20 23:44:04,142 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 198 treesize of output 202 [2021-11-20 23:44:05,155 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:44:05,458 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:44:05,695 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 14 treesize of output 10 [2021-11-20 23:44:05,894 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-20 23:44:05,894 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2021-11-20 23:44:14,460 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:44:16,656 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:44:16,656 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:44:16,656 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 12, 12] total 30 [2021-11-20 23:44:16,657 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1907260427] [2021-11-20 23:44:16,657 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:44:16,657 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2021-11-20 23:44:16,657 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:44:16,657 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2021-11-20 23:44:16,658 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=235, Invalid=1927, Unknown=0, NotChecked=0, Total=2162 [2021-11-20 23:44:16,658 INFO L87 Difference]: Start difference. First operand 1043 states and 1202 transitions. Second operand has 32 states, 31 states have (on average 4.612903225806452) internal successors, (143), 31 states have internal predecessors, (143), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:44:17,176 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:44:17,176 INFO L93 Difference]: Finished difference Result 1893 states and 2193 transitions. [2021-11-20 23:44:17,176 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-11-20 23:44:17,177 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 31 states have (on average 4.612903225806452) internal successors, (143), 31 states have internal predecessors, (143), 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 52 [2021-11-20 23:44:17,177 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:44:17,183 INFO L225 Difference]: With dead ends: 1893 [2021-11-20 23:44:17,183 INFO L226 Difference]: Without dead ends: 1893 [2021-11-20 23:44:17,183 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 176 GetRequests, 119 SyntacticMatches, 1 SemanticMatches, 56 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 934 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=450, Invalid=2856, Unknown=0, NotChecked=0, Total=3306 [2021-11-20 23:44:17,184 INFO L933 BasicCegarLoop]: 30 mSDtfsCounter, 432 mSDsluCounter, 255 mSDsCounter, 0 mSdLazyCounter, 675 mSolverCounterSat, 39 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 432 SdHoareTripleChecker+Valid, 250 SdHoareTripleChecker+Invalid, 714 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 39 IncrementalHoareTripleChecker+Valid, 675 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-20 23:44:17,184 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [432 Valid, 250 Invalid, 714 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [39 Valid, 675 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-20 23:44:17,185 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1893 states. [2021-11-20 23:44:17,206 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1893 to 1205. [2021-11-20 23:44:17,208 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1205 states, 1203 states have (on average 1.1562759767248545) internal successors, (1391), 1204 states have internal predecessors, (1391), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:44:17,211 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1205 states to 1205 states and 1391 transitions. [2021-11-20 23:44:17,211 INFO L78 Accepts]: Start accepts. Automaton has 1205 states and 1391 transitions. Word has length 52 [2021-11-20 23:44:17,211 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:44:17,211 INFO L470 AbstractCegarLoop]: Abstraction has 1205 states and 1391 transitions. [2021-11-20 23:44:17,212 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 31 states have (on average 4.612903225806452) internal successors, (143), 31 states have internal predecessors, (143), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:44:17,212 INFO L276 IsEmpty]: Start isEmpty. Operand 1205 states and 1391 transitions. [2021-11-20 23:44:17,214 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2021-11-20 23:44:17,214 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:44:17,214 INFO L514 BasicCegarLoop]: trace histogram [7, 7, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:44:17,249 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a0d2f8-3e8e-41d4-891b-65088d0c913e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Forceful destruction successful, exit code 0 [2021-11-20 23:44:17,439 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a0d2f8-3e8e-41d4-891b-65088d0c913e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable40 [2021-11-20 23:44:17,439 INFO L402 AbstractCegarLoop]: === Iteration 42 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 15 more)] === [2021-11-20 23:44:17,439 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:44:17,439 INFO L85 PathProgramCache]: Analyzing trace with hash -1797067441, now seen corresponding path program 12 times [2021-11-20 23:44:17,439 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:44:17,439 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1309375479] [2021-11-20 23:44:17,440 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:44:17,440 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:44:17,456 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:44:17,726 INFO L134 CoverageAnalysis]: Checked inductivity of 141 backedges. 25 proven. 115 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-20 23:44:17,726 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:44:17,726 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1309375479] [2021-11-20 23:44:17,726 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1309375479] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:44:17,726 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [694977494] [2021-11-20 23:44:17,726 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-20 23:44:17,727 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:44:17,727 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a0d2f8-3e8e-41d4-891b-65088d0c913e/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:44:17,728 INFO L229 MonitoredProcess]: Starting monitored process 28 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a0d2f8-3e8e-41d4-891b-65088d0c913e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:44:17,730 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a0d2f8-3e8e-41d4-891b-65088d0c913e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Waiting until timeout for monitored process [2021-11-20 23:44:17,813 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-20 23:44:17,813 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:44:17,815 INFO L263 TraceCheckSpWp]: Trace formula consists of 312 conjuncts, 52 conjunts are in the unsatisfiable core [2021-11-20 23:44:17,816 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:44:17,828 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-20 23:44:17,828 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 1 case distinctions, treesize of input 9 treesize of output 15 [2021-11-20 23:44:18,394 INFO L134 CoverageAnalysis]: Checked inductivity of 141 backedges. 36 proven. 104 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-20 23:44:18,394 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:44:19,151 INFO L134 CoverageAnalysis]: Checked inductivity of 141 backedges. 49 proven. 91 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-20 23:44:19,151 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [694977494] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:44:19,152 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2053785949] [2021-11-20 23:44:19,153 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-20 23:44:19,153 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:44:19,153 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:44:19,153 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:44:19,154 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:44:19,204 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:44:19,205 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-20 23:44:19,417 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:44:19,566 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:44:19,566 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 200 treesize of output 192 [2021-11-20 23:44:20,034 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:44:20,228 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:44:20,933 INFO L354 Elim1Store]: treesize reduction 28, result has 44.0 percent of original size [2021-11-20 23:44:20,933 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 204 treesize of output 208 [2021-11-20 23:44:21,676 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:44:21,974 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:44:22,200 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-20 23:44:22,446 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-20 23:44:22,446 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2021-11-20 23:44:26,760 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:44:29,076 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:44:29,076 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:44:29,076 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 19, 19] total 55 [2021-11-20 23:44:29,076 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [711041422] [2021-11-20 23:44:29,076 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:44:29,077 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 57 states [2021-11-20 23:44:29,077 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:44:29,077 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 57 interpolants. [2021-11-20 23:44:29,077 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=493, Invalid=4477, Unknown=0, NotChecked=0, Total=4970 [2021-11-20 23:44:29,078 INFO L87 Difference]: Start difference. First operand 1205 states and 1391 transitions. Second operand has 57 states, 56 states have (on average 2.8035714285714284) internal successors, (157), 56 states have internal predecessors, (157), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:44:30,879 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:44:30,879 INFO L93 Difference]: Finished difference Result 1682 states and 1911 transitions. [2021-11-20 23:44:30,879 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2021-11-20 23:44:30,880 INFO L78 Accepts]: Start accepts. Automaton has has 57 states, 56 states have (on average 2.8035714285714284) internal successors, (157), 56 states have internal predecessors, (157), 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 53 [2021-11-20 23:44:30,880 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:44:30,885 INFO L225 Difference]: With dead ends: 1682 [2021-11-20 23:44:30,885 INFO L226 Difference]: Without dead ends: 1682 [2021-11-20 23:44:30,886 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 197 GetRequests, 105 SyntacticMatches, 1 SemanticMatches, 91 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2585 ImplicationChecksByTransitivity, 3.9s TimeCoverageRelationStatistics Valid=1292, Invalid=7264, Unknown=0, NotChecked=0, Total=8556 [2021-11-20 23:44:30,886 INFO L933 BasicCegarLoop]: 31 mSDtfsCounter, 617 mSDsluCounter, 694 mSDsCounter, 0 mSdLazyCounter, 2619 mSolverCounterSat, 61 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 617 SdHoareTripleChecker+Valid, 499 SdHoareTripleChecker+Invalid, 2680 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 61 IncrementalHoareTripleChecker+Valid, 2619 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.1s IncrementalHoareTripleChecker+Time [2021-11-20 23:44:30,886 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [617 Valid, 499 Invalid, 2680 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [61 Valid, 2619 Invalid, 0 Unknown, 0 Unchecked, 1.1s Time] [2021-11-20 23:44:30,888 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1682 states. [2021-11-20 23:44:30,905 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1682 to 1233. [2021-11-20 23:44:30,906 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1233 states, 1231 states have (on average 1.1575954508529651) internal successors, (1425), 1232 states have internal predecessors, (1425), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:44:30,909 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1233 states to 1233 states and 1425 transitions. [2021-11-20 23:44:30,909 INFO L78 Accepts]: Start accepts. Automaton has 1233 states and 1425 transitions. Word has length 53 [2021-11-20 23:44:30,909 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:44:30,910 INFO L470 AbstractCegarLoop]: Abstraction has 1233 states and 1425 transitions. [2021-11-20 23:44:30,910 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 57 states, 56 states have (on average 2.8035714285714284) internal successors, (157), 56 states have internal predecessors, (157), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:44:30,910 INFO L276 IsEmpty]: Start isEmpty. Operand 1233 states and 1425 transitions. [2021-11-20 23:44:30,912 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2021-11-20 23:44:30,912 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:44:30,913 INFO L514 BasicCegarLoop]: trace histogram [7, 7, 7, 6, 4, 4, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:44:30,948 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a0d2f8-3e8e-41d4-891b-65088d0c913e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Forceful destruction successful, exit code 0 [2021-11-20 23:44:31,127 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable41,28 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a0d2f8-3e8e-41d4-891b-65088d0c913e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:44:31,127 INFO L402 AbstractCegarLoop]: === Iteration 43 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 15 more)] === [2021-11-20 23:44:31,127 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:44:31,128 INFO L85 PathProgramCache]: Analyzing trace with hash 1899949435, now seen corresponding path program 3 times [2021-11-20 23:44:31,128 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:44:31,128 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [179512136] [2021-11-20 23:44:31,128 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:44:31,128 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:44:31,149 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:44:31,352 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 19 proven. 85 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-20 23:44:31,353 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:44:31,353 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [179512136] [2021-11-20 23:44:31,353 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [179512136] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:44:31,353 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1753765244] [2021-11-20 23:44:31,353 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-20 23:44:31,353 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:44:31,353 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a0d2f8-3e8e-41d4-891b-65088d0c913e/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:44:31,355 INFO L229 MonitoredProcess]: Starting monitored process 29 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a0d2f8-3e8e-41d4-891b-65088d0c913e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:44:31,374 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a0d2f8-3e8e-41d4-891b-65088d0c913e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Waiting until timeout for monitored process [2021-11-20 23:44:31,460 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-20 23:44:31,460 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:44:31,462 INFO L263 TraceCheckSpWp]: Trace formula consists of 317 conjuncts, 44 conjunts are in the unsatisfiable core [2021-11-20 23:44:31,464 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:44:31,618 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-11-20 23:44:31,901 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 19 proven. 85 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-20 23:44:31,901 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:44:32,009 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 13 [2021-11-20 23:44:32,011 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 22 [2021-11-20 23:44:32,119 INFO L134 CoverageAnalysis]: Checked inductivity of 114 backedges. 19 proven. 85 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-20 23:44:32,119 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1753765244] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:44:32,119 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [110280557] [2021-11-20 23:44:32,123 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2021-11-20 23:44:32,124 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:44:32,124 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:44:32,124 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:44:32,124 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:44:32,215 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:44:32,216 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-20 23:44:32,358 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:44:32,640 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:44:32,641 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 200 treesize of output 192 [2021-11-20 23:44:33,230 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:44:33,441 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:44:34,092 INFO L354 Elim1Store]: treesize reduction 22, result has 50.0 percent of original size [2021-11-20 23:44:34,093 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 198 treesize of output 202 [2021-11-20 23:44:34,853 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:44:35,025 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:44:35,215 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 14 treesize of output 10 [2021-11-20 23:44:35,437 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-20 23:44:35,437 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2021-11-20 23:44:50,357 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:44:52,535 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:44:52,535 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:44:52,535 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 16] total 30 [2021-11-20 23:44:52,535 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2020346082] [2021-11-20 23:44:52,535 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:44:52,536 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 30 states [2021-11-20 23:44:52,536 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:44:52,536 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2021-11-20 23:44:52,536 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=168, Invalid=1812, Unknown=0, NotChecked=0, Total=1980 [2021-11-20 23:44:52,536 INFO L87 Difference]: Start difference. First operand 1233 states and 1425 transitions. Second operand has 30 states, 30 states have (on average 3.3) internal successors, (99), 30 states have internal predecessors, (99), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:44:53,332 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:44:53,332 INFO L93 Difference]: Finished difference Result 1491 states and 1703 transitions. [2021-11-20 23:44:53,332 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-11-20 23:44:53,332 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 30 states have (on average 3.3) internal successors, (99), 30 states have internal predecessors, (99), 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 54 [2021-11-20 23:44:53,332 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:44:53,337 INFO L225 Difference]: With dead ends: 1491 [2021-11-20 23:44:53,337 INFO L226 Difference]: Without dead ends: 1431 [2021-11-20 23:44:53,337 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 189 GetRequests, 130 SyntacticMatches, 3 SemanticMatches, 56 ConstructedPredicates, 0 IntricatePredicates, 2 DeprecatedPredicates, 806 ImplicationChecksByTransitivity, 2.9s TimeCoverageRelationStatistics Valid=332, Invalid=2974, Unknown=0, NotChecked=0, Total=3306 [2021-11-20 23:44:53,338 INFO L933 BasicCegarLoop]: 38 mSDtfsCounter, 161 mSDsluCounter, 797 mSDsCounter, 0 mSdLazyCounter, 1220 mSolverCounterSat, 20 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 161 SdHoareTripleChecker+Valid, 586 SdHoareTripleChecker+Invalid, 1285 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 20 IncrementalHoareTripleChecker+Valid, 1220 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 45 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-20 23:44:53,338 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [161 Valid, 586 Invalid, 1285 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [20 Valid, 1220 Invalid, 0 Unknown, 45 Unchecked, 0.5s Time] [2021-11-20 23:44:53,339 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1431 states. [2021-11-20 23:44:53,354 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1431 to 1284. [2021-11-20 23:44:53,355 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1284 states, 1282 states have (on average 1.1583463338533542) internal successors, (1485), 1283 states have internal predecessors, (1485), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:44:53,357 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1284 states to 1284 states and 1485 transitions. [2021-11-20 23:44:53,358 INFO L78 Accepts]: Start accepts. Automaton has 1284 states and 1485 transitions. Word has length 54 [2021-11-20 23:44:53,358 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:44:53,358 INFO L470 AbstractCegarLoop]: Abstraction has 1284 states and 1485 transitions. [2021-11-20 23:44:53,358 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 30 states, 30 states have (on average 3.3) internal successors, (99), 30 states have internal predecessors, (99), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:44:53,358 INFO L276 IsEmpty]: Start isEmpty. Operand 1284 states and 1485 transitions. [2021-11-20 23:44:53,361 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2021-11-20 23:44:53,361 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:44:53,361 INFO L514 BasicCegarLoop]: trace histogram [7, 7, 7, 6, 5, 5, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:44:53,396 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a0d2f8-3e8e-41d4-891b-65088d0c913e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Forceful destruction successful, exit code 0 [2021-11-20 23:44:53,587 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable42,29 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a0d2f8-3e8e-41d4-891b-65088d0c913e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:44:53,587 INFO L402 AbstractCegarLoop]: === Iteration 44 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 15 more)] === [2021-11-20 23:44:53,587 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:44:53,587 INFO L85 PathProgramCache]: Analyzing trace with hash -245475155, now seen corresponding path program 4 times [2021-11-20 23:44:53,587 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:44:53,588 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1284504002] [2021-11-20 23:44:53,588 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:44:53,588 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:44:53,603 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:44:53,812 INFO L134 CoverageAnalysis]: Checked inductivity of 123 backedges. 9 proven. 104 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-20 23:44:53,812 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:44:53,812 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1284504002] [2021-11-20 23:44:53,812 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1284504002] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:44:53,813 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1857473170] [2021-11-20 23:44:53,813 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-20 23:44:53,813 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:44:53,813 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a0d2f8-3e8e-41d4-891b-65088d0c913e/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:44:53,819 INFO L229 MonitoredProcess]: Starting monitored process 30 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a0d2f8-3e8e-41d4-891b-65088d0c913e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:44:53,837 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a0d2f8-3e8e-41d4-891b-65088d0c913e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Waiting until timeout for monitored process [2021-11-20 23:44:53,901 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:44:53,903 INFO L263 TraceCheckSpWp]: Trace formula consists of 327 conjuncts, 40 conjunts are in the unsatisfiable core [2021-11-20 23:44:53,905 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:44:54,232 INFO L134 CoverageAnalysis]: Checked inductivity of 123 backedges. 16 proven. 97 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-20 23:44:54,232 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:44:54,590 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 5 treesize of output 3 [2021-11-20 23:44:54,631 INFO L134 CoverageAnalysis]: Checked inductivity of 123 backedges. 16 proven. 97 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-20 23:44:54,632 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1857473170] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:44:54,632 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [63296510] [2021-11-20 23:44:54,633 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2021-11-20 23:44:54,633 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:44:54,633 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:44:54,633 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:44:54,634 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:44:54,659 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:44:54,660 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-20 23:44:54,861 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:44:55,063 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:44:55,063 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 200 treesize of output 192 [2021-11-20 23:44:55,552 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:44:55,669 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:44:56,376 INFO L354 Elim1Store]: treesize reduction 28, result has 44.0 percent of original size [2021-11-20 23:44:56,376 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 204 treesize of output 208 [2021-11-20 23:44:57,324 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:44:57,560 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:44:57,839 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 14 treesize of output 10 [2021-11-20 23:44:58,145 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-20 23:44:58,145 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2021-11-20 23:45:13,268 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:45:15,333 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:45:15,333 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:45:15,334 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 15, 15] total 32 [2021-11-20 23:45:15,334 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2134922204] [2021-11-20 23:45:15,334 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:45:15,334 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 33 states [2021-11-20 23:45:15,334 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:45:15,334 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2021-11-20 23:45:15,334 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=217, Invalid=2039, Unknown=0, NotChecked=0, Total=2256 [2021-11-20 23:45:15,335 INFO L87 Difference]: Start difference. First operand 1284 states and 1485 transitions. Second operand has 33 states, 32 states have (on average 3.65625) internal successors, (117), 33 states have internal predecessors, (117), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:45:16,121 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:45:16,121 INFO L93 Difference]: Finished difference Result 1695 states and 1911 transitions. [2021-11-20 23:45:16,121 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-11-20 23:45:16,122 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 32 states have (on average 3.65625) internal successors, (117), 33 states have internal predecessors, (117), 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 56 [2021-11-20 23:45:16,122 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:45:16,129 INFO L225 Difference]: With dead ends: 1695 [2021-11-20 23:45:16,129 INFO L226 Difference]: Without dead ends: 1695 [2021-11-20 23:45:16,130 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 193 GetRequests, 132 SyntacticMatches, 2 SemanticMatches, 59 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1044 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=493, Invalid=3167, Unknown=0, NotChecked=0, Total=3660 [2021-11-20 23:45:16,131 INFO L933 BasicCegarLoop]: 23 mSDtfsCounter, 359 mSDsluCounter, 289 mSDsCounter, 0 mSdLazyCounter, 1135 mSolverCounterSat, 31 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 359 SdHoareTripleChecker+Valid, 220 SdHoareTripleChecker+Invalid, 1166 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 31 IncrementalHoareTripleChecker+Valid, 1135 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-20 23:45:16,131 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [359 Valid, 220 Invalid, 1166 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [31 Valid, 1135 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-20 23:45:16,133 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1695 states. [2021-11-20 23:45:16,154 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1695 to 1300. [2021-11-20 23:45:16,155 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1300 states, 1298 states have (on average 1.1594761171032357) internal successors, (1505), 1299 states have internal predecessors, (1505), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:45:16,157 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1300 states to 1300 states and 1505 transitions. [2021-11-20 23:45:16,157 INFO L78 Accepts]: Start accepts. Automaton has 1300 states and 1505 transitions. Word has length 56 [2021-11-20 23:45:16,158 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:45:16,158 INFO L470 AbstractCegarLoop]: Abstraction has 1300 states and 1505 transitions. [2021-11-20 23:45:16,158 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 33 states, 32 states have (on average 3.65625) internal successors, (117), 33 states have internal predecessors, (117), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:45:16,158 INFO L276 IsEmpty]: Start isEmpty. Operand 1300 states and 1505 transitions. [2021-11-20 23:45:16,160 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2021-11-20 23:45:16,160 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:45:16,160 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 5, 4, 4, 4, 4, 4, 4, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:45:16,198 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a0d2f8-3e8e-41d4-891b-65088d0c913e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Forceful destruction successful, exit code 0 [2021-11-20 23:45:16,375 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable43,30 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a0d2f8-3e8e-41d4-891b-65088d0c913e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:45:16,375 INFO L402 AbstractCegarLoop]: === Iteration 45 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 15 more)] === [2021-11-20 23:45:16,375 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:45:16,375 INFO L85 PathProgramCache]: Analyzing trace with hash -2063977640, now seen corresponding path program 4 times [2021-11-20 23:45:16,375 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:45:16,376 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [121581107] [2021-11-20 23:45:16,376 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:45:16,376 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:45:16,400 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:45:16,876 INFO L134 CoverageAnalysis]: Checked inductivity of 87 backedges. 37 proven. 46 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-20 23:45:16,877 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:45:16,877 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [121581107] [2021-11-20 23:45:16,877 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [121581107] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:45:16,877 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1193691873] [2021-11-20 23:45:16,877 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-20 23:45:16,877 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:45:16,877 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a0d2f8-3e8e-41d4-891b-65088d0c913e/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:45:16,879 INFO L229 MonitoredProcess]: Starting monitored process 31 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a0d2f8-3e8e-41d4-891b-65088d0c913e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:45:16,905 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a0d2f8-3e8e-41d4-891b-65088d0c913e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Waiting until timeout for monitored process [2021-11-20 23:45:16,971 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:45:16,973 INFO L263 TraceCheckSpWp]: Trace formula consists of 325 conjuncts, 40 conjunts are in the unsatisfiable core [2021-11-20 23:45:16,974 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:45:16,988 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-20 23:45:16,988 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 1 case distinctions, treesize of input 9 treesize of output 15 [2021-11-20 23:45:17,382 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 26 treesize of output 22 [2021-11-20 23:45:17,456 INFO L354 Elim1Store]: treesize reduction 41, result has 18.0 percent of original size [2021-11-20 23:45:17,456 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 43 treesize of output 42 [2021-11-20 23:45:20,095 INFO L354 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2021-11-20 23:45:20,095 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 56 treesize of output 52 [2021-11-20 23:45:20,105 INFO L354 Elim1Store]: treesize reduction 40, result has 7.0 percent of original size [2021-11-20 23:45:20,105 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 45 treesize of output 31 [2021-11-20 23:45:20,125 INFO L134 CoverageAnalysis]: Checked inductivity of 87 backedges. 67 proven. 16 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-20 23:45:20,125 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:45:20,660 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 56 treesize of output 52 [2021-11-20 23:45:21,255 INFO L134 CoverageAnalysis]: Checked inductivity of 87 backedges. 62 proven. 21 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-20 23:45:21,256 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1193691873] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:45:21,256 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1405940507] [2021-11-20 23:45:21,257 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2021-11-20 23:45:21,257 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:45:21,257 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:45:21,258 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:45:21,258 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:45:21,349 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:45:21,350 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-20 23:45:21,499 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 16 [2021-11-20 23:45:21,733 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-20 23:45:21,733 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 194 treesize of output 193 [2021-11-20 23:45:22,352 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:45:22,495 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:45:23,350 INFO L354 Elim1Store]: treesize reduction 22, result has 50.0 percent of original size [2021-11-20 23:45:23,350 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 198 treesize of output 202 [2021-11-20 23:45:24,757 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:45:25,008 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:45:25,130 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 14 treesize of output 10 [2021-11-20 23:45:25,299 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-20 23:45:25,299 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2021-11-20 23:45:40,568 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:45:43,086 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:45:43,086 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:45:43,086 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 16, 16] total 45 [2021-11-20 23:45:43,086 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2129153751] [2021-11-20 23:45:43,086 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:45:43,086 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 46 states [2021-11-20 23:45:43,087 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:45:43,087 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2021-11-20 23:45:43,087 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=250, Invalid=3410, Unknown=0, NotChecked=0, Total=3660 [2021-11-20 23:45:43,087 INFO L87 Difference]: Start difference. First operand 1300 states and 1505 transitions. Second operand has 46 states, 46 states have (on average 3.0217391304347827) internal successors, (139), 45 states have internal predecessors, (139), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:45:46,415 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:45:46,416 INFO L93 Difference]: Finished difference Result 1331 states and 1536 transitions. [2021-11-20 23:45:46,416 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2021-11-20 23:45:46,416 INFO L78 Accepts]: Start accepts. Automaton has has 46 states, 46 states have (on average 3.0217391304347827) internal successors, (139), 45 states have internal predecessors, (139), 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 56 [2021-11-20 23:45:46,416 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:45:46,421 INFO L225 Difference]: With dead ends: 1331 [2021-11-20 23:45:46,421 INFO L226 Difference]: Without dead ends: 1266 [2021-11-20 23:45:46,422 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 229 GetRequests, 129 SyntacticMatches, 0 SemanticMatches, 100 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2470 ImplicationChecksByTransitivity, 6.8s TimeCoverageRelationStatistics Valid=868, Invalid=9434, Unknown=0, NotChecked=0, Total=10302 [2021-11-20 23:45:46,422 INFO L933 BasicCegarLoop]: 14 mSDtfsCounter, 199 mSDsluCounter, 334 mSDsCounter, 0 mSdLazyCounter, 641 mSolverCounterSat, 110 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 199 SdHoareTripleChecker+Valid, 339 SdHoareTripleChecker+Invalid, 830 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 110 IncrementalHoareTripleChecker+Valid, 641 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 79 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-20 23:45:46,422 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [199 Valid, 339 Invalid, 830 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [110 Valid, 641 Invalid, 0 Unknown, 79 Unchecked, 0.4s Time] [2021-11-20 23:45:46,424 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1266 states. [2021-11-20 23:45:46,435 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1266 to 1264. [2021-11-20 23:45:46,436 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1264 states, 1262 states have (on average 1.1608557844690968) internal successors, (1465), 1263 states have internal predecessors, (1465), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:45:46,438 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1264 states to 1264 states and 1465 transitions. [2021-11-20 23:45:46,438 INFO L78 Accepts]: Start accepts. Automaton has 1264 states and 1465 transitions. Word has length 56 [2021-11-20 23:45:46,438 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:45:46,438 INFO L470 AbstractCegarLoop]: Abstraction has 1264 states and 1465 transitions. [2021-11-20 23:45:46,438 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 46 states, 46 states have (on average 3.0217391304347827) internal successors, (139), 45 states have internal predecessors, (139), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:45:46,438 INFO L276 IsEmpty]: Start isEmpty. Operand 1264 states and 1465 transitions. [2021-11-20 23:45:46,440 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2021-11-20 23:45:46,440 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:45:46,440 INFO L514 BasicCegarLoop]: trace histogram [8, 8, 8, 8, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:45:46,469 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a0d2f8-3e8e-41d4-891b-65088d0c913e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Forceful destruction successful, exit code 0 [2021-11-20 23:45:46,655 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 31 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a0d2f8-3e8e-41d4-891b-65088d0c913e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable44 [2021-11-20 23:45:46,655 INFO L402 AbstractCegarLoop]: === Iteration 46 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 15 more)] === [2021-11-20 23:45:46,655 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:45:46,656 INFO L85 PathProgramCache]: Analyzing trace with hash 1719878614, now seen corresponding path program 13 times [2021-11-20 23:45:46,656 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:45:46,656 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1359303801] [2021-11-20 23:45:46,656 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:45:46,656 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:45:46,677 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:45:46,989 INFO L134 CoverageAnalysis]: Checked inductivity of 170 backedges. 22 proven. 147 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-20 23:45:46,989 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:45:46,989 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1359303801] [2021-11-20 23:45:46,989 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1359303801] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:45:46,989 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1478822343] [2021-11-20 23:45:46,989 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-20 23:45:46,989 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:45:46,989 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a0d2f8-3e8e-41d4-891b-65088d0c913e/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:45:46,990 INFO L229 MonitoredProcess]: Starting monitored process 32 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a0d2f8-3e8e-41d4-891b-65088d0c913e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:45:46,992 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a0d2f8-3e8e-41d4-891b-65088d0c913e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Waiting until timeout for monitored process [2021-11-20 23:45:47,070 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:45:47,072 INFO L263 TraceCheckSpWp]: Trace formula consists of 332 conjuncts, 64 conjunts are in the unsatisfiable core [2021-11-20 23:45:47,074 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:45:47,286 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-11-20 23:45:47,477 INFO L134 CoverageAnalysis]: Checked inductivity of 170 backedges. 22 proven. 147 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-20 23:45:47,477 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:45:47,612 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 13 [2021-11-20 23:45:47,614 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 22 [2021-11-20 23:45:47,760 INFO L134 CoverageAnalysis]: Checked inductivity of 170 backedges. 22 proven. 147 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-20 23:45:47,760 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1478822343] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:45:47,760 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [393192420] [2021-11-20 23:45:47,761 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-20 23:45:47,762 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:45:47,762 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:45:47,762 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:45:47,762 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:45:47,851 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:45:47,852 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-20 23:45:47,970 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 16 [2021-11-20 23:45:48,241 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-20 23:45:48,241 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 194 treesize of output 193 [2021-11-20 23:45:48,841 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:45:49,053 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:45:49,996 INFO L354 Elim1Store]: treesize reduction 22, result has 50.0 percent of original size [2021-11-20 23:45:49,996 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 198 treesize of output 202 [2021-11-20 23:45:50,777 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:45:51,038 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:45:51,213 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 14 treesize of output 10 [2021-11-20 23:45:51,313 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-20 23:45:51,313 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2021-11-20 23:45:55,933 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:45:58,201 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:45:58,201 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:45:58,201 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22, 22] total 39 [2021-11-20 23:45:58,201 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1889270389] [2021-11-20 23:45:58,201 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:45:58,201 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 39 states [2021-11-20 23:45:58,201 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:45:58,202 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2021-11-20 23:45:58,202 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=185, Invalid=2571, Unknown=0, NotChecked=0, Total=2756 [2021-11-20 23:45:58,202 INFO L87 Difference]: Start difference. First operand 1264 states and 1465 transitions. Second operand has 39 states, 39 states have (on average 2.4615384615384617) internal successors, (96), 39 states have internal predecessors, (96), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:45:59,724 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:45:59,724 INFO L93 Difference]: Finished difference Result 1741 states and 1978 transitions. [2021-11-20 23:45:59,725 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2021-11-20 23:45:59,725 INFO L78 Accepts]: Start accepts. Automaton has has 39 states, 39 states have (on average 2.4615384615384617) internal successors, (96), 39 states have internal predecessors, (96), 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 57 [2021-11-20 23:45:59,725 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:45:59,730 INFO L225 Difference]: With dead ends: 1741 [2021-11-20 23:45:59,730 INFO L226 Difference]: Without dead ends: 1633 [2021-11-20 23:45:59,731 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 210 GetRequests, 137 SyntacticMatches, 3 SemanticMatches, 70 ConstructedPredicates, 0 IntricatePredicates, 2 DeprecatedPredicates, 1165 ImplicationChecksByTransitivity, 3.4s TimeCoverageRelationStatistics Valid=418, Invalid=4694, Unknown=0, NotChecked=0, Total=5112 [2021-11-20 23:45:59,731 INFO L933 BasicCegarLoop]: 72 mSDtfsCounter, 517 mSDsluCounter, 1740 mSDsCounter, 0 mSdLazyCounter, 2518 mSolverCounterSat, 53 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 517 SdHoareTripleChecker+Valid, 1291 SdHoareTripleChecker+Invalid, 2781 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 53 IncrementalHoareTripleChecker+Valid, 2518 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 210 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2021-11-20 23:45:59,731 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [517 Valid, 1291 Invalid, 2781 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [53 Valid, 2518 Invalid, 0 Unknown, 210 Unchecked, 1.0s Time] [2021-11-20 23:45:59,733 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1633 states. [2021-11-20 23:45:59,752 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1633 to 1476. [2021-11-20 23:45:59,754 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1476 states, 1474 states have (on average 1.162143826322931) internal successors, (1713), 1475 states have internal predecessors, (1713), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:45:59,757 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1476 states to 1476 states and 1713 transitions. [2021-11-20 23:45:59,758 INFO L78 Accepts]: Start accepts. Automaton has 1476 states and 1713 transitions. Word has length 57 [2021-11-20 23:45:59,758 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:45:59,758 INFO L470 AbstractCegarLoop]: Abstraction has 1476 states and 1713 transitions. [2021-11-20 23:45:59,758 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 39 states, 39 states have (on average 2.4615384615384617) internal successors, (96), 39 states have internal predecessors, (96), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:45:59,758 INFO L276 IsEmpty]: Start isEmpty. Operand 1476 states and 1713 transitions. [2021-11-20 23:45:59,760 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 59 [2021-11-20 23:45:59,760 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:45:59,761 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 5, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:45:59,814 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a0d2f8-3e8e-41d4-891b-65088d0c913e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Forceful destruction successful, exit code 0 [2021-11-20 23:45:59,983 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 32 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a0d2f8-3e8e-41d4-891b-65088d0c913e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable45 [2021-11-20 23:45:59,983 INFO L402 AbstractCegarLoop]: === Iteration 47 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 15 more)] === [2021-11-20 23:45:59,983 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:45:59,983 INFO L85 PathProgramCache]: Analyzing trace with hash 699218186, now seen corresponding path program 5 times [2021-11-20 23:45:59,984 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:45:59,984 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1872757487] [2021-11-20 23:45:59,984 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:45:59,984 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:46:00,002 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:46:00,200 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 37 proven. 42 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2021-11-20 23:46:00,200 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:46:00,200 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1872757487] [2021-11-20 23:46:00,201 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1872757487] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:46:00,201 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1075907369] [2021-11-20 23:46:00,201 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-20 23:46:00,201 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:46:00,201 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a0d2f8-3e8e-41d4-891b-65088d0c913e/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:46:00,202 INFO L229 MonitoredProcess]: Starting monitored process 33 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a0d2f8-3e8e-41d4-891b-65088d0c913e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:46:00,214 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a0d2f8-3e8e-41d4-891b-65088d0c913e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Waiting until timeout for monitored process [2021-11-20 23:46:00,338 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2021-11-20 23:46:00,338 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:46:00,341 INFO L263 TraceCheckSpWp]: Trace formula consists of 335 conjuncts, 51 conjunts are in the unsatisfiable core [2021-11-20 23:46:00,343 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:46:00,348 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 10 treesize of output 8 [2021-11-20 23:46:00,566 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-11-20 23:46:00,622 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-20 23:46:00,623 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 35 treesize of output 34 [2021-11-20 23:46:01,982 INFO L354 Elim1Store]: treesize reduction 57, result has 34.5 percent of original size [2021-11-20 23:46:01,983 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 53 treesize of output 56 [2021-11-20 23:46:02,012 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 7 proven. 75 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-20 23:46:02,012 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:46:03,086 WARN L838 $PredicateComparison]: unable to prove that (forall ((|ULTIMATE.start_main_~nondetString2~0#1.offset| Int) (|ULTIMATE.start_main_~length2~0#1| Int)) (= (select (select (store |c_#memory_int| |c_ULTIMATE.start_main_~nondetString2~0#1.base| (store (select |c_#memory_int| |c_ULTIMATE.start_main_~nondetString2~0#1.base|) (+ (- 1) |ULTIMATE.start_main_~nondetString2~0#1.offset| |ULTIMATE.start_main_~length2~0#1|) 0)) |c_ULTIMATE.start_main_~nondetString1~0#1.base|) (+ |c_ULTIMATE.start_main_~nondetString1~0#1.offset| 3)) 0)) is different from false [2021-11-20 23:46:03,089 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 56 treesize of output 50 [2021-11-20 23:46:03,300 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 4 proven. 78 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-20 23:46:03,301 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1075907369] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:46:03,301 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [328204013] [2021-11-20 23:46:03,302 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2021-11-20 23:46:03,302 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:46:03,302 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:46:03,302 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:46:03,302 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:46:03,398 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:46:03,399 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-20 23:46:03,553 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:46:03,759 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:46:03,760 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 200 treesize of output 192 [2021-11-20 23:46:04,179 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:46:04,363 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:46:05,189 INFO L354 Elim1Store]: treesize reduction 22, result has 50.0 percent of original size [2021-11-20 23:46:05,189 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 198 treesize of output 202 [2021-11-20 23:46:06,232 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:46:06,577 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:46:06,675 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 10 [2021-11-20 23:46:06,888 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-20 23:46:06,889 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2021-11-20 23:46:22,164 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:46:24,511 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:46:24,512 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:46:24,512 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 16, 16] total 40 [2021-11-20 23:46:24,512 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [230144087] [2021-11-20 23:46:24,512 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:46:24,512 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 41 states [2021-11-20 23:46:24,512 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:46:24,513 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2021-11-20 23:46:24,513 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=186, Invalid=2787, Unknown=1, NotChecked=106, Total=3080 [2021-11-20 23:46:24,513 INFO L87 Difference]: Start difference. First operand 1476 states and 1713 transitions. Second operand has 41 states, 41 states have (on average 3.3902439024390243) internal successors, (139), 40 states have internal predecessors, (139), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:46:26,370 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:46:26,370 INFO L93 Difference]: Finished difference Result 1989 states and 2303 transitions. [2021-11-20 23:46:26,370 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-11-20 23:46:26,370 INFO L78 Accepts]: Start accepts. Automaton has has 41 states, 41 states have (on average 3.3902439024390243) internal successors, (139), 40 states have internal predecessors, (139), 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 58 [2021-11-20 23:46:26,370 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:46:26,376 INFO L225 Difference]: With dead ends: 1989 [2021-11-20 23:46:26,376 INFO L226 Difference]: Without dead ends: 1544 [2021-11-20 23:46:26,376 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 192 GetRequests, 130 SyntacticMatches, 1 SemanticMatches, 61 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 862 ImplicationChecksByTransitivity, 5.5s TimeCoverageRelationStatistics Valid=240, Invalid=3545, Unknown=1, NotChecked=120, Total=3906 [2021-11-20 23:46:26,377 INFO L933 BasicCegarLoop]: 37 mSDtfsCounter, 60 mSDsluCounter, 1016 mSDsCounter, 0 mSdLazyCounter, 769 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 60 SdHoareTripleChecker+Valid, 823 SdHoareTripleChecker+Invalid, 1147 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 769 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 372 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-20 23:46:26,377 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [60 Valid, 823 Invalid, 1147 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 769 Invalid, 0 Unknown, 372 Unchecked, 0.3s Time] [2021-11-20 23:46:26,378 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1544 states. [2021-11-20 23:46:26,414 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1544 to 1357. [2021-11-20 23:46:26,416 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1357 states, 1355 states have (on average 1.1749077490774908) internal successors, (1592), 1356 states have internal predecessors, (1592), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:46:26,419 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1357 states to 1357 states and 1592 transitions. [2021-11-20 23:46:26,419 INFO L78 Accepts]: Start accepts. Automaton has 1357 states and 1592 transitions. Word has length 58 [2021-11-20 23:46:26,419 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:46:26,420 INFO L470 AbstractCegarLoop]: Abstraction has 1357 states and 1592 transitions. [2021-11-20 23:46:26,420 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 41 states, 41 states have (on average 3.3902439024390243) internal successors, (139), 40 states have internal predecessors, (139), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:46:26,420 INFO L276 IsEmpty]: Start isEmpty. Operand 1357 states and 1592 transitions. [2021-11-20 23:46:26,421 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2021-11-20 23:46:26,421 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:46:26,422 INFO L514 BasicCegarLoop]: trace histogram [8, 8, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:46:26,448 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a0d2f8-3e8e-41d4-891b-65088d0c913e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Forceful destruction successful, exit code 0 [2021-11-20 23:46:26,639 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable46,33 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a0d2f8-3e8e-41d4-891b-65088d0c913e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:46:26,639 INFO L402 AbstractCegarLoop]: === Iteration 48 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 15 more)] === [2021-11-20 23:46:26,640 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:46:26,640 INFO L85 PathProgramCache]: Analyzing trace with hash -1730629020, now seen corresponding path program 14 times [2021-11-20 23:46:26,640 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:46:26,640 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2087954522] [2021-11-20 23:46:26,640 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:46:26,640 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:46:26,654 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:46:27,002 INFO L134 CoverageAnalysis]: Checked inductivity of 185 backedges. 36 proven. 148 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-20 23:46:27,002 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:46:27,002 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2087954522] [2021-11-20 23:46:27,002 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2087954522] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:46:27,002 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [432522053] [2021-11-20 23:46:27,002 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-20 23:46:27,003 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:46:27,003 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a0d2f8-3e8e-41d4-891b-65088d0c913e/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:46:27,007 INFO L229 MonitoredProcess]: Starting monitored process 34 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a0d2f8-3e8e-41d4-891b-65088d0c913e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:46:27,035 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a0d2f8-3e8e-41d4-891b-65088d0c913e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Waiting until timeout for monitored process [2021-11-20 23:46:27,175 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2021-11-20 23:46:27,175 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:46:27,178 INFO L263 TraceCheckSpWp]: Trace formula consists of 342 conjuncts, 50 conjunts are in the unsatisfiable core [2021-11-20 23:46:27,180 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:46:27,195 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-20 23:46:27,195 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 1 case distinctions, treesize of input 9 treesize of output 15 [2021-11-20 23:46:28,033 INFO L134 CoverageAnalysis]: Checked inductivity of 185 backedges. 49 proven. 135 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-20 23:46:28,033 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:46:28,943 INFO L134 CoverageAnalysis]: Checked inductivity of 185 backedges. 64 proven. 120 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-20 23:46:28,943 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [432522053] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:46:28,943 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [324775882] [2021-11-20 23:46:28,945 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-20 23:46:28,945 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:46:28,945 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:46:28,945 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:46:28,945 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:46:29,054 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:46:29,056 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-20 23:46:29,196 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 16 [2021-11-20 23:46:29,405 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-20 23:46:29,406 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 194 treesize of output 193 [2021-11-20 23:46:29,998 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:46:30,162 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:46:30,884 INFO L354 Elim1Store]: treesize reduction 22, result has 50.0 percent of original size [2021-11-20 23:46:30,885 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 198 treesize of output 202 [2021-11-20 23:46:31,972 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:46:32,261 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:46:32,445 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 14 treesize of output 10 [2021-11-20 23:46:32,649 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-20 23:46:32,649 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2021-11-20 23:46:37,108 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:46:39,371 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:46:39,371 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:46:39,371 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 21, 21] total 62 [2021-11-20 23:46:39,371 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [497101232] [2021-11-20 23:46:39,371 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:46:39,371 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 64 states [2021-11-20 23:46:39,372 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:46:39,372 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 64 interpolants. [2021-11-20 23:46:39,372 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=649, Invalid=5357, Unknown=0, NotChecked=0, Total=6006 [2021-11-20 23:46:39,372 INFO L87 Difference]: Start difference. First operand 1357 states and 1592 transitions. Second operand has 64 states, 63 states have (on average 2.8095238095238093) internal successors, (177), 63 states have internal predecessors, (177), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:46:41,591 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:46:41,591 INFO L93 Difference]: Finished difference Result 1704 states and 1946 transitions. [2021-11-20 23:46:41,591 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2021-11-20 23:46:41,591 INFO L78 Accepts]: Start accepts. Automaton has has 64 states, 63 states have (on average 2.8095238095238093) internal successors, (177), 63 states have internal predecessors, (177), 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 [2021-11-20 23:46:41,592 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:46:41,597 INFO L225 Difference]: With dead ends: 1704 [2021-11-20 23:46:41,597 INFO L226 Difference]: Without dead ends: 1704 [2021-11-20 23:46:41,599 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 220 GetRequests, 119 SyntacticMatches, 0 SemanticMatches, 101 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3184 ImplicationChecksByTransitivity, 4.5s TimeCoverageRelationStatistics Valid=1697, Invalid=8809, Unknown=0, NotChecked=0, Total=10506 [2021-11-20 23:46:41,599 INFO L933 BasicCegarLoop]: 33 mSDtfsCounter, 724 mSDsluCounter, 712 mSDsCounter, 0 mSdLazyCounter, 2860 mSolverCounterSat, 69 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 724 SdHoareTripleChecker+Valid, 515 SdHoareTripleChecker+Invalid, 2929 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 69 IncrementalHoareTripleChecker+Valid, 2860 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.2s IncrementalHoareTripleChecker+Time [2021-11-20 23:46:41,599 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [724 Valid, 515 Invalid, 2929 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [69 Valid, 2860 Invalid, 0 Unknown, 0 Unchecked, 1.2s Time] [2021-11-20 23:46:41,601 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1704 states. [2021-11-20 23:46:41,618 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1704 to 1389. [2021-11-20 23:46:41,619 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1389 states, 1387 states have (on average 1.1759192501802451) internal successors, (1631), 1388 states have internal predecessors, (1631), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:46:41,622 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1389 states to 1389 states and 1631 transitions. [2021-11-20 23:46:41,622 INFO L78 Accepts]: Start accepts. Automaton has 1389 states and 1631 transitions. Word has length 59 [2021-11-20 23:46:41,623 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:46:41,623 INFO L470 AbstractCegarLoop]: Abstraction has 1389 states and 1631 transitions. [2021-11-20 23:46:41,623 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 64 states, 63 states have (on average 2.8095238095238093) internal successors, (177), 63 states have internal predecessors, (177), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:46:41,623 INFO L276 IsEmpty]: Start isEmpty. Operand 1389 states and 1631 transitions. [2021-11-20 23:46:41,625 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2021-11-20 23:46:41,625 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:46:41,625 INFO L514 BasicCegarLoop]: trace histogram [8, 8, 8, 7, 5, 5, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:46:41,666 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a0d2f8-3e8e-41d4-891b-65088d0c913e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Forceful destruction successful, exit code 0 [2021-11-20 23:46:41,851 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 34 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a0d2f8-3e8e-41d4-891b-65088d0c913e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable47 [2021-11-20 23:46:41,851 INFO L402 AbstractCegarLoop]: === Iteration 49 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 15 more)] === [2021-11-20 23:46:41,851 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:46:41,851 INFO L85 PathProgramCache]: Analyzing trace with hash -159526860, now seen corresponding path program 5 times [2021-11-20 23:46:41,851 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:46:41,852 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1913066571] [2021-11-20 23:46:41,852 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:46:41,852 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:46:41,873 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:46:42,105 INFO L134 CoverageAnalysis]: Checked inductivity of 152 backedges. 22 proven. 120 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-20 23:46:42,105 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:46:42,105 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1913066571] [2021-11-20 23:46:42,105 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1913066571] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:46:42,105 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [967313060] [2021-11-20 23:46:42,105 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-20 23:46:42,106 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:46:42,106 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a0d2f8-3e8e-41d4-891b-65088d0c913e/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:46:42,111 INFO L229 MonitoredProcess]: Starting monitored process 35 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a0d2f8-3e8e-41d4-891b-65088d0c913e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:46:42,130 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a0d2f8-3e8e-41d4-891b-65088d0c913e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Waiting until timeout for monitored process [2021-11-20 23:46:42,389 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2021-11-20 23:46:42,389 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:46:42,393 INFO L263 TraceCheckSpWp]: Trace formula consists of 347 conjuncts, 52 conjunts are in the unsatisfiable core [2021-11-20 23:46:42,394 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:46:42,575 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-11-20 23:46:42,911 INFO L134 CoverageAnalysis]: Checked inductivity of 152 backedges. 22 proven. 120 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-20 23:46:42,911 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:46:43,065 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 13 [2021-11-20 23:46:43,067 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 22 [2021-11-20 23:46:43,215 INFO L134 CoverageAnalysis]: Checked inductivity of 152 backedges. 22 proven. 120 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-20 23:46:43,215 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [967313060] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:46:43,215 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2064066940] [2021-11-20 23:46:43,216 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2021-11-20 23:46:43,216 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:46:43,216 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:46:43,217 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:46:43,217 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:46:43,337 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:46:43,339 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-20 23:46:43,499 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 16 [2021-11-20 23:46:43,806 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-20 23:46:43,806 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 194 treesize of output 193 [2021-11-20 23:46:44,427 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:46:44,580 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:46:45,442 INFO L354 Elim1Store]: treesize reduction 28, result has 44.0 percent of original size [2021-11-20 23:46:45,442 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 204 treesize of output 208 [2021-11-20 23:46:46,759 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:46:46,928 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:46:47,069 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 14 treesize of output 10 [2021-11-20 23:46:47,241 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-20 23:46:47,241 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2021-11-20 23:47:02,526 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:47:04,743 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:47:04,743 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:47:04,744 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 18] total 33 [2021-11-20 23:47:04,744 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [984446163] [2021-11-20 23:47:04,744 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:47:04,744 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 33 states [2021-11-20 23:47:04,744 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:47:04,744 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2021-11-20 23:47:04,744 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=176, Invalid=2080, Unknown=0, NotChecked=0, Total=2256 [2021-11-20 23:47:04,745 INFO L87 Difference]: Start difference. First operand 1389 states and 1631 transitions. Second operand has 33 states, 33 states have (on average 3.242424242424242) internal successors, (107), 33 states have internal predecessors, (107), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:47:05,761 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:47:05,761 INFO L93 Difference]: Finished difference Result 1506 states and 1727 transitions. [2021-11-20 23:47:05,761 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-11-20 23:47:05,761 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 33 states have (on average 3.242424242424242) internal successors, (107), 33 states have internal predecessors, (107), 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 60 [2021-11-20 23:47:05,762 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:47:05,766 INFO L225 Difference]: With dead ends: 1506 [2021-11-20 23:47:05,766 INFO L226 Difference]: Without dead ends: 1363 [2021-11-20 23:47:05,766 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 211 GetRequests, 147 SyntacticMatches, 3 SemanticMatches, 61 ConstructedPredicates, 0 IntricatePredicates, 2 DeprecatedPredicates, 929 ImplicationChecksByTransitivity, 3.1s TimeCoverageRelationStatistics Valid=363, Invalid=3543, Unknown=0, NotChecked=0, Total=3906 [2021-11-20 23:47:05,767 INFO L933 BasicCegarLoop]: 49 mSDtfsCounter, 364 mSDsluCounter, 1103 mSDsCounter, 0 mSdLazyCounter, 1568 mSolverCounterSat, 36 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 364 SdHoareTripleChecker+Valid, 814 SdHoareTripleChecker+Invalid, 1745 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 36 IncrementalHoareTripleChecker+Valid, 1568 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 141 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-20 23:47:05,767 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [364 Valid, 814 Invalid, 1745 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [36 Valid, 1568 Invalid, 0 Unknown, 141 Unchecked, 0.6s Time] [2021-11-20 23:47:05,768 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1363 states. [2021-11-20 23:47:05,777 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1363 to 1179. [2021-11-20 23:47:05,778 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1179 states, 1177 states have (on average 1.1690739167374682) internal successors, (1376), 1178 states have internal predecessors, (1376), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:47:05,781 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1179 states to 1179 states and 1376 transitions. [2021-11-20 23:47:05,781 INFO L78 Accepts]: Start accepts. Automaton has 1179 states and 1376 transitions. Word has length 60 [2021-11-20 23:47:05,781 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:47:05,781 INFO L470 AbstractCegarLoop]: Abstraction has 1179 states and 1376 transitions. [2021-11-20 23:47:05,781 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 33 states, 33 states have (on average 3.242424242424242) internal successors, (107), 33 states have internal predecessors, (107), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:47:05,782 INFO L276 IsEmpty]: Start isEmpty. Operand 1179 states and 1376 transitions. [2021-11-20 23:47:05,783 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2021-11-20 23:47:05,783 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:47:05,783 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 5, 5, 5, 5, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:47:05,799 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a0d2f8-3e8e-41d4-891b-65088d0c913e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Forceful destruction successful, exit code 0 [2021-11-20 23:47:05,988 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 35 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a0d2f8-3e8e-41d4-891b-65088d0c913e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable48 [2021-11-20 23:47:05,988 INFO L402 AbstractCegarLoop]: === Iteration 50 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 15 more)] === [2021-11-20 23:47:05,988 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:47:05,988 INFO L85 PathProgramCache]: Analyzing trace with hash 1567102280, now seen corresponding path program 9 times [2021-11-20 23:47:05,988 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:47:05,989 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1458462688] [2021-11-20 23:47:05,989 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:47:05,989 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:47:06,013 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:47:06,456 INFO L134 CoverageAnalysis]: Checked inductivity of 112 backedges. 5 proven. 106 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-20 23:47:06,456 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:47:06,456 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1458462688] [2021-11-20 23:47:06,456 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1458462688] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:47:06,456 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1472197374] [2021-11-20 23:47:06,456 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-20 23:47:06,457 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:47:06,457 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a0d2f8-3e8e-41d4-891b-65088d0c913e/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:47:06,459 INFO L229 MonitoredProcess]: Starting monitored process 36 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a0d2f8-3e8e-41d4-891b-65088d0c913e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:47:06,481 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a0d2f8-3e8e-41d4-891b-65088d0c913e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (36)] Waiting until timeout for monitored process [2021-11-20 23:47:06,576 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-20 23:47:06,576 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:47:06,580 INFO L263 TraceCheckSpWp]: Trace formula consists of 350 conjuncts, 85 conjunts are in the unsatisfiable core [2021-11-20 23:47:06,583 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:47:06,603 INFO L354 Elim1Store]: treesize reduction 11, result has 45.0 percent of original size [2021-11-20 23:47:06,603 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 1 case distinctions, treesize of input 9 treesize of output 15 [2021-11-20 23:47:07,103 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 34 treesize of output 30 [2021-11-20 23:47:07,176 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:47:07,176 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 28 treesize of output 27 [2021-11-20 23:47:08,658 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:47:08,659 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:47:08,672 INFO L354 Elim1Store]: treesize reduction 46, result has 27.0 percent of original size [2021-11-20 23:47:08,673 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 2 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 51 treesize of output 38 [2021-11-20 23:47:08,814 INFO L134 CoverageAnalysis]: Checked inductivity of 112 backedges. 9 proven. 103 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:47:08,814 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:47:10,111 INFO L354 Elim1Store]: treesize reduction 29, result has 43.1 percent of original size [2021-11-20 23:47:10,112 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 207 treesize of output 167 [2021-11-20 23:47:10,119 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-20 23:47:10,119 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 163 treesize of output 157 [2021-11-20 23:47:10,136 INFO L354 Elim1Store]: treesize reduction 12, result has 7.7 percent of original size [2021-11-20 23:47:10,137 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 138 treesize of output 129 [2021-11-20 23:47:10,198 INFO L354 Elim1Store]: treesize reduction 9, result has 74.3 percent of original size [2021-11-20 23:47:10,198 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 85 treesize of output 93 [2021-11-20 23:47:11,395 INFO L134 CoverageAnalysis]: Checked inductivity of 112 backedges. 16 proven. 96 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:47:11,396 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1472197374] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:47:11,396 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [793078606] [2021-11-20 23:47:11,397 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2021-11-20 23:47:11,397 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:47:11,398 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:47:11,398 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:47:11,398 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:47:11,417 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:47:11,418 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-20 23:47:11,644 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 16 [2021-11-20 23:47:11,931 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-20 23:47:11,931 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 194 treesize of output 193 [2021-11-20 23:47:12,569 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:47:12,744 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:47:13,391 INFO L354 Elim1Store]: treesize reduction 28, result has 44.0 percent of original size [2021-11-20 23:47:13,391 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 204 treesize of output 208 [2021-11-20 23:47:14,219 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:47:14,475 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:47:14,671 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 14 treesize of output 10 [2021-11-20 23:47:14,789 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-20 23:47:14,789 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2021-11-20 23:47:23,029 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:47:26,323 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:47:26,323 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:47:26,323 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 23] total 65 [2021-11-20 23:47:26,323 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2081728598] [2021-11-20 23:47:26,323 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:47:26,324 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 66 states [2021-11-20 23:47:26,324 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:47:26,324 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 66 interpolants. [2021-11-20 23:47:26,324 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=435, Invalid=6045, Unknown=0, NotChecked=0, Total=6480 [2021-11-20 23:47:26,324 INFO L87 Difference]: Start difference. First operand 1179 states and 1376 transitions. Second operand has 66 states, 66 states have (on average 2.772727272727273) internal successors, (183), 65 states have internal predecessors, (183), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:47:45,574 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:47:45,574 INFO L93 Difference]: Finished difference Result 3589 states and 4127 transitions. [2021-11-20 23:47:45,574 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 133 states. [2021-11-20 23:47:45,574 INFO L78 Accepts]: Start accepts. Automaton has has 66 states, 66 states have (on average 2.772727272727273) internal successors, (183), 65 states have internal predecessors, (183), 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 61 [2021-11-20 23:47:45,574 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:47:45,589 INFO L225 Difference]: With dead ends: 3589 [2021-11-20 23:47:45,589 INFO L226 Difference]: Without dead ends: 3528 [2021-11-20 23:47:45,590 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 333 GetRequests, 123 SyntacticMatches, 0 SemanticMatches, 210 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12403 ImplicationChecksByTransitivity, 22.8s TimeCoverageRelationStatistics Valid=5769, Invalid=38963, Unknown=0, NotChecked=0, Total=44732 [2021-11-20 23:47:45,591 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 2693 mSDsluCounter, 667 mSDsCounter, 0 mSdLazyCounter, 3721 mSolverCounterSat, 494 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2693 SdHoareTripleChecker+Valid, 681 SdHoareTripleChecker+Invalid, 4412 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 494 IncrementalHoareTripleChecker+Valid, 3721 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 197 IncrementalHoareTripleChecker+Unchecked, 2.3s IncrementalHoareTripleChecker+Time [2021-11-20 23:47:45,591 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2693 Valid, 681 Invalid, 4412 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [494 Valid, 3721 Invalid, 0 Unknown, 197 Unchecked, 2.3s Time] [2021-11-20 23:47:45,593 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3528 states. [2021-11-20 23:47:45,623 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3528 to 1945. [2021-11-20 23:47:45,625 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1945 states, 1943 states have (on average 1.161605764282038) internal successors, (2257), 1944 states have internal predecessors, (2257), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:47:45,628 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1945 states to 1945 states and 2257 transitions. [2021-11-20 23:47:45,629 INFO L78 Accepts]: Start accepts. Automaton has 1945 states and 2257 transitions. Word has length 61 [2021-11-20 23:47:45,629 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:47:45,629 INFO L470 AbstractCegarLoop]: Abstraction has 1945 states and 2257 transitions. [2021-11-20 23:47:45,629 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 66 states, 66 states have (on average 2.772727272727273) internal successors, (183), 65 states have internal predecessors, (183), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:47:45,629 INFO L276 IsEmpty]: Start isEmpty. Operand 1945 states and 2257 transitions. [2021-11-20 23:47:45,631 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2021-11-20 23:47:45,631 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:47:45,631 INFO L514 BasicCegarLoop]: trace histogram [9, 9, 9, 9, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:47:45,652 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a0d2f8-3e8e-41d4-891b-65088d0c913e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (36)] Forceful destruction successful, exit code 0 [2021-11-20 23:47:45,831 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable49,36 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a0d2f8-3e8e-41d4-891b-65088d0c913e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:47:45,832 INFO L402 AbstractCegarLoop]: === Iteration 51 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 15 more)] === [2021-11-20 23:47:45,832 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:47:45,832 INFO L85 PathProgramCache]: Analyzing trace with hash 1094088299, now seen corresponding path program 15 times [2021-11-20 23:47:45,832 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:47:45,832 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1644429984] [2021-11-20 23:47:45,832 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:47:45,832 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:47:45,853 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:47:46,166 INFO L134 CoverageAnalysis]: Checked inductivity of 218 backedges. 25 proven. 192 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-20 23:47:46,167 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:47:46,167 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1644429984] [2021-11-20 23:47:46,167 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1644429984] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:47:46,167 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [503458708] [2021-11-20 23:47:46,167 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-20 23:47:46,167 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:47:46,167 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a0d2f8-3e8e-41d4-891b-65088d0c913e/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:47:46,168 INFO L229 MonitoredProcess]: Starting monitored process 37 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a0d2f8-3e8e-41d4-891b-65088d0c913e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:47:46,169 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a0d2f8-3e8e-41d4-891b-65088d0c913e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (37)] Waiting until timeout for monitored process [2021-11-20 23:47:46,248 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-20 23:47:46,248 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:47:46,250 INFO L263 TraceCheckSpWp]: Trace formula consists of 362 conjuncts, 68 conjunts are in the unsatisfiable core [2021-11-20 23:47:46,251 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:47:46,497 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 21 treesize of output 17 [2021-11-20 23:47:46,701 INFO L134 CoverageAnalysis]: Checked inductivity of 218 backedges. 25 proven. 192 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-20 23:47:46,701 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:47:46,838 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 13 [2021-11-20 23:47:46,839 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 22 [2021-11-20 23:47:46,984 INFO L134 CoverageAnalysis]: Checked inductivity of 218 backedges. 25 proven. 192 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-20 23:47:46,984 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [503458708] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:47:46,984 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [858013531] [2021-11-20 23:47:46,985 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-20 23:47:46,985 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:47:46,985 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:47:46,985 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:47:46,985 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:47:46,999 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:47:47,000 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-20 23:47:47,221 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:47:47,431 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:47:47,432 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 200 treesize of output 192 [2021-11-20 23:47:47,810 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:47:48,042 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:47:48,735 INFO L354 Elim1Store]: treesize reduction 28, result has 44.0 percent of original size [2021-11-20 23:47:48,735 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 204 treesize of output 208 [2021-11-20 23:47:49,781 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:47:50,146 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:47:50,422 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 14 treesize of output 10 [2021-11-20 23:47:50,528 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-20 23:47:50,528 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2021-11-20 23:47:54,722 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:47:57,036 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:47:57,036 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:47:57,036 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24, 24] total 42 [2021-11-20 23:47:57,037 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1113423096] [2021-11-20 23:47:57,037 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:47:57,037 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 42 states [2021-11-20 23:47:57,037 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:47:57,037 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2021-11-20 23:47:57,037 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=193, Invalid=2887, Unknown=0, NotChecked=0, Total=3080 [2021-11-20 23:47:57,038 INFO L87 Difference]: Start difference. First operand 1945 states and 2257 transitions. Second operand has 42 states, 42 states have (on average 2.4761904761904763) internal successors, (104), 42 states have internal predecessors, (104), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:47:59,356 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:47:59,356 INFO L93 Difference]: Finished difference Result 2722 states and 3103 transitions. [2021-11-20 23:47:59,356 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2021-11-20 23:47:59,357 INFO L78 Accepts]: Start accepts. Automaton has has 42 states, 42 states have (on average 2.4761904761904763) internal successors, (104), 42 states have internal predecessors, (104), 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 63 [2021-11-20 23:47:59,357 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:47:59,365 INFO L225 Difference]: With dead ends: 2722 [2021-11-20 23:47:59,365 INFO L226 Difference]: Without dead ends: 2525 [2021-11-20 23:47:59,366 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 232 GetRequests, 154 SyntacticMatches, 3 SemanticMatches, 75 ConstructedPredicates, 0 IntricatePredicates, 2 DeprecatedPredicates, 1312 ImplicationChecksByTransitivity, 3.7s TimeCoverageRelationStatistics Valid=449, Invalid=5403, Unknown=0, NotChecked=0, Total=5852 [2021-11-20 23:47:59,366 INFO L933 BasicCegarLoop]: 82 mSDtfsCounter, 607 mSDsluCounter, 2144 mSDsCounter, 0 mSdLazyCounter, 3454 mSolverCounterSat, 62 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 607 SdHoareTripleChecker+Valid, 1585 SdHoareTripleChecker+Invalid, 3516 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 62 IncrementalHoareTripleChecker+Valid, 3454 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.5s IncrementalHoareTripleChecker+Time [2021-11-20 23:47:59,367 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [607 Valid, 1585 Invalid, 3516 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [62 Valid, 3454 Invalid, 0 Unknown, 0 Unchecked, 1.5s Time] [2021-11-20 23:47:59,369 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2525 states. [2021-11-20 23:47:59,394 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2525 to 2281. [2021-11-20 23:47:59,396 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2281 states, 2279 states have (on average 1.1645458534444932) internal successors, (2654), 2280 states have internal predecessors, (2654), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:47:59,398 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2281 states to 2281 states and 2654 transitions. [2021-11-20 23:47:59,398 INFO L78 Accepts]: Start accepts. Automaton has 2281 states and 2654 transitions. Word has length 63 [2021-11-20 23:47:59,398 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:47:59,398 INFO L470 AbstractCegarLoop]: Abstraction has 2281 states and 2654 transitions. [2021-11-20 23:47:59,398 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 42 states, 42 states have (on average 2.4761904761904763) internal successors, (104), 42 states have internal predecessors, (104), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:47:59,399 INFO L276 IsEmpty]: Start isEmpty. Operand 2281 states and 2654 transitions. [2021-11-20 23:47:59,400 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2021-11-20 23:47:59,401 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:47:59,401 INFO L514 BasicCegarLoop]: trace histogram [9, 9, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:47:59,421 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a0d2f8-3e8e-41d4-891b-65088d0c913e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (37)] Forceful destruction successful, exit code 0 [2021-11-20 23:47:59,601 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 37 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a0d2f8-3e8e-41d4-891b-65088d0c913e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable50 [2021-11-20 23:47:59,601 INFO L402 AbstractCegarLoop]: === Iteration 52 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATION === [ULTIMATE.startErr0REQUIRES_VIOLATION, ULTIMATE.startErr1REQUIRES_VIOLATION, ULTIMATE.startErr2REQUIRES_VIOLATION, ULTIMATE.startErr3REQUIRES_VIOLATION (and 15 more)] === [2021-11-20 23:47:59,602 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:47:59,602 INFO L85 PathProgramCache]: Analyzing trace with hash -453623175, now seen corresponding path program 16 times [2021-11-20 23:47:59,602 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:47:59,602 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [565756869] [2021-11-20 23:47:59,602 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:47:59,602 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:47:59,620 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:48:00,017 INFO L134 CoverageAnalysis]: Checked inductivity of 235 backedges. 49 proven. 185 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-20 23:48:00,018 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:48:00,018 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [565756869] [2021-11-20 23:48:00,018 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [565756869] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:48:00,018 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1377473088] [2021-11-20 23:48:00,018 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-20 23:48:00,018 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:48:00,018 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a0d2f8-3e8e-41d4-891b-65088d0c913e/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:48:00,019 INFO L229 MonitoredProcess]: Starting monitored process 38 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a0d2f8-3e8e-41d4-891b-65088d0c913e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:48:00,030 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_40a0d2f8-3e8e-41d4-891b-65088d0c913e/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (38)] Waiting until timeout for monitored process [2021-11-20 23:48:00,111 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:48:00,113 INFO L263 TraceCheckSpWp]: Trace formula consists of 372 conjuncts, 60 conjunts are in the unsatisfiable core [2021-11-20 23:48:00,114 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:48:00,560 INFO L134 CoverageAnalysis]: Checked inductivity of 235 backedges. 64 proven. 170 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-20 23:48:00,560 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:48:01,054 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 5 treesize of output 3 [2021-11-20 23:48:01,113 INFO L134 CoverageAnalysis]: Checked inductivity of 235 backedges. 64 proven. 170 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-20 23:48:01,113 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1377473088] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:48:01,113 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1985319592] [2021-11-20 23:48:01,114 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2021-11-20 23:48:01,114 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:48:01,114 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:48:01,115 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:48:01,115 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:48:01,164 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:48:01,164 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 11 [2021-11-20 23:48:01,358 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 16 [2021-11-20 23:48:01,551 INFO L354 Elim1Store]: treesize reduction 19, result has 36.7 percent of original size [2021-11-20 23:48:01,551 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 194 treesize of output 193 [2021-11-20 23:48:02,157 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:48:02,380 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:48:03,284 INFO L354 Elim1Store]: treesize reduction 28, result has 44.0 percent of original size [2021-11-20 23:48:03,285 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 204 treesize of output 208 [2021-11-20 23:48:04,378 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:48:04,502 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 19 [2021-11-20 23:48:04,704 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 14 treesize of output 10 [2021-11-20 23:48:04,854 INFO L354 Elim1Store]: treesize reduction 40, result has 20.0 percent of original size [2021-11-20 23:48:04,855 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 25 treesize of output 24 [2021-11-20 23:48:09,267 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:48:11,480 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:48:11,480 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:48:11,480 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 23, 23] total 48 [2021-11-20 23:48:11,481 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [390437537] [2021-11-20 23:48:11,481 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:48:11,481 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 49 states [2021-11-20 23:48:11,481 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:48:11,482 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2021-11-20 23:48:11,482 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=361, Invalid=3545, Unknown=0, NotChecked=0, Total=3906 [2021-11-20 23:48:11,482 INFO L87 Difference]: Start difference. First operand 2281 states and 2654 transitions. Second operand has 49 states, 48 states have (on average 2.875) internal successors, (138), 49 states have internal predecessors, (138), 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)