./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/ldv-regression/test27-1.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 53f42b1a Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_94c494a0-a6dc-4a19-ba44-aca4f1217779/bin/utaipan-TEXQjIfE4P/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_94c494a0-a6dc-4a19-ba44-aca4f1217779/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_94c494a0-a6dc-4a19-ba44-aca4f1217779/bin/utaipan-TEXQjIfE4P/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_94c494a0-a6dc-4a19-ba44-aca4f1217779/bin/utaipan-TEXQjIfE4P/config/TaipanReach.xml -i ../../sv-benchmarks/c/ldv-regression/test27-1.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_94c494a0-a6dc-4a19-ba44-aca4f1217779/bin/utaipan-TEXQjIfE4P/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_94c494a0-a6dc-4a19-ba44-aca4f1217779/bin/utaipan-TEXQjIfE4P --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 78863f43fa37191b47f0d738bb1bc2018c82b38cb68dad85c455cdbd7fd69aa4 --- Real Ultimate output --- This is Ultimate 0.2.1-dev-53f42b1 [2021-11-21 01:55:35,360 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-21 01:55:35,362 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-21 01:55:35,398 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-21 01:55:35,400 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-21 01:55:35,404 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-21 01:55:35,408 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-21 01:55:35,412 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-21 01:55:35,414 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-21 01:55:35,420 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-21 01:55:35,421 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-21 01:55:35,423 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-21 01:55:35,423 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-21 01:55:35,426 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-21 01:55:35,428 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-21 01:55:35,431 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-21 01:55:35,433 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-21 01:55:35,434 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-21 01:55:35,438 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-21 01:55:35,445 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-21 01:55:35,447 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-21 01:55:35,449 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-21 01:55:35,452 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-21 01:55:35,453 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-21 01:55:35,462 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-21 01:55:35,464 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-21 01:55:35,464 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-21 01:55:35,466 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-21 01:55:35,467 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-21 01:55:35,468 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-21 01:55:35,469 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-21 01:55:35,470 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-21 01:55:35,472 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-21 01:55:35,473 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-21 01:55:35,474 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-21 01:55:35,475 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-21 01:55:35,475 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-21 01:55:35,476 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-21 01:55:35,476 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-21 01:55:35,477 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-21 01:55:35,477 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-21 01:55:35,478 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_94c494a0-a6dc-4a19-ba44-aca4f1217779/bin/utaipan-TEXQjIfE4P/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-21 01:55:35,526 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-21 01:55:35,528 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-21 01:55:35,529 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-21 01:55:35,529 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-21 01:55:35,536 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-21 01:55:35,536 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-21 01:55:35,537 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-21 01:55:35,537 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-21 01:55:35,537 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-21 01:55:35,537 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-21 01:55:35,538 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-21 01:55:35,539 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-21 01:55:35,539 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-21 01:55:35,539 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-21 01:55:35,539 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-21 01:55:35,540 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-21 01:55:35,540 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-21 01:55:35,540 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-21 01:55:35,541 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-21 01:55:35,541 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-21 01:55:35,541 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-21 01:55:35,541 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-21 01:55:35,542 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-21 01:55:35,542 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-21 01:55:35,542 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-21 01:55:35,543 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-21 01:55:35,544 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-21 01:55:35,544 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-21 01:55:35,545 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-21 01:55:35,545 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-21 01:55:35,545 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-21 01:55:35,545 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-21 01:55:35,546 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-21 01:55:35,546 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-21 01:55:35,546 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-21 01:55:35,546 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-21 01:55:35,547 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-21 01:55:35,547 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-21 01:55:35,547 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-21 01:55:35,547 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-21 01:55:35,548 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-21 01:55:35,548 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_94c494a0-a6dc-4a19-ba44-aca4f1217779/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_94c494a0-a6dc-4a19-ba44-aca4f1217779/bin/utaipan-TEXQjIfE4P Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 78863f43fa37191b47f0d738bb1bc2018c82b38cb68dad85c455cdbd7fd69aa4 [2021-11-21 01:55:35,873 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-21 01:55:35,897 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-21 01:55:35,900 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-21 01:55:35,901 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-21 01:55:35,902 INFO L275 PluginConnector]: CDTParser initialized [2021-11-21 01:55:35,904 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_94c494a0-a6dc-4a19-ba44-aca4f1217779/bin/utaipan-TEXQjIfE4P/../../sv-benchmarks/c/ldv-regression/test27-1.c [2021-11-21 01:55:35,982 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_94c494a0-a6dc-4a19-ba44-aca4f1217779/bin/utaipan-TEXQjIfE4P/data/c598033c9/c677a891187243feab502ed95c1a0fb6/FLAG2b89fa982 [2021-11-21 01:55:36,491 INFO L306 CDTParser]: Found 1 translation units. [2021-11-21 01:55:36,492 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_94c494a0-a6dc-4a19-ba44-aca4f1217779/sv-benchmarks/c/ldv-regression/test27-1.c [2021-11-21 01:55:36,502 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_94c494a0-a6dc-4a19-ba44-aca4f1217779/bin/utaipan-TEXQjIfE4P/data/c598033c9/c677a891187243feab502ed95c1a0fb6/FLAG2b89fa982 [2021-11-21 01:55:36,876 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_94c494a0-a6dc-4a19-ba44-aca4f1217779/bin/utaipan-TEXQjIfE4P/data/c598033c9/c677a891187243feab502ed95c1a0fb6 [2021-11-21 01:55:36,879 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-21 01:55:36,880 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-21 01:55:36,897 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-21 01:55:36,897 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-21 01:55:36,900 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-21 01:55:36,900 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.11 01:55:36" (1/1) ... [2021-11-21 01:55:36,901 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@39eb108 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:55:36, skipping insertion in model container [2021-11-21 01:55:36,902 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.11 01:55:36" (1/1) ... [2021-11-21 01:55:36,908 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-21 01:55:36,922 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-21 01:55:37,110 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_94c494a0-a6dc-4a19-ba44-aca4f1217779/sv-benchmarks/c/ldv-regression/test27-1.c[1154,1167] [2021-11-21 01:55:37,113 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-21 01:55:37,120 INFO L203 MainTranslator]: Completed pre-run [2021-11-21 01:55:37,140 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_94c494a0-a6dc-4a19-ba44-aca4f1217779/sv-benchmarks/c/ldv-regression/test27-1.c[1154,1167] [2021-11-21 01:55:37,142 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-21 01:55:37,155 INFO L208 MainTranslator]: Completed translation [2021-11-21 01:55:37,155 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:55:37 WrapperNode [2021-11-21 01:55:37,156 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-21 01:55:37,157 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-21 01:55:37,157 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-21 01:55:37,157 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-21 01:55:37,166 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:55:37" (1/1) ... [2021-11-21 01:55:37,184 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:55:37" (1/1) ... [2021-11-21 01:55:37,208 INFO L137 Inliner]: procedures = 16, calls = 42, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 113 [2021-11-21 01:55:37,208 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-21 01:55:37,209 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-21 01:55:37,209 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-21 01:55:37,209 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-21 01:55:37,218 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:55:37" (1/1) ... [2021-11-21 01:55:37,218 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:55:37" (1/1) ... [2021-11-21 01:55:37,221 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:55:37" (1/1) ... [2021-11-21 01:55:37,222 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:55:37" (1/1) ... [2021-11-21 01:55:37,231 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:55:37" (1/1) ... [2021-11-21 01:55:37,235 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:55:37" (1/1) ... [2021-11-21 01:55:37,236 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:55:37" (1/1) ... [2021-11-21 01:55:37,239 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-21 01:55:37,240 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-21 01:55:37,240 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-21 01:55:37,241 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-21 01:55:37,241 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:55:37" (1/1) ... [2021-11-21 01:55:37,252 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-21 01:55:37,263 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_94c494a0-a6dc-4a19-ba44-aca4f1217779/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:55:37,289 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_94c494a0-a6dc-4a19-ba44-aca4f1217779/bin/utaipan-TEXQjIfE4P/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-21 01:55:37,316 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_94c494a0-a6dc-4a19-ba44-aca4f1217779/bin/utaipan-TEXQjIfE4P/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-21 01:55:37,336 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2021-11-21 01:55:37,336 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-21 01:55:37,337 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-21 01:55:37,337 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2021-11-21 01:55:37,337 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-11-21 01:55:37,337 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-11-21 01:55:37,337 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-21 01:55:37,337 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-21 01:55:37,338 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-11-21 01:55:37,338 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-11-21 01:55:37,435 INFO L236 CfgBuilder]: Building ICFG [2021-11-21 01:55:37,436 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-21 01:55:37,618 INFO L277 CfgBuilder]: Performing block encoding [2021-11-21 01:55:37,640 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-21 01:55:37,640 INFO L301 CfgBuilder]: Removed 2 assume(true) statements. [2021-11-21 01:55:37,642 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.11 01:55:37 BoogieIcfgContainer [2021-11-21 01:55:37,643 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-21 01:55:37,644 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-21 01:55:37,645 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-21 01:55:37,663 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-21 01:55:37,663 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.11 01:55:36" (1/3) ... [2021-11-21 01:55:37,664 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1601d70a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.11 01:55:37, skipping insertion in model container [2021-11-21 01:55:37,664 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:55:37" (2/3) ... [2021-11-21 01:55:37,664 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1601d70a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.11 01:55:37, skipping insertion in model container [2021-11-21 01:55:37,664 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.11 01:55:37" (3/3) ... [2021-11-21 01:55:37,665 INFO L111 eAbstractionObserver]: Analyzing ICFG test27-1.c [2021-11-21 01:55:37,670 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-21 01:55:37,670 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-21 01:55:37,716 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-21 01:55:37,723 INFO L339 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mLoopAccelerationTechnique=FAST_UPR [2021-11-21 01:55:37,723 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-21 01:55:37,737 INFO L276 IsEmpty]: Start isEmpty. Operand has 13 states, 11 states have (on average 1.6363636363636365) internal successors, (18), 12 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:55:37,742 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2021-11-21 01:55:37,742 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:55:37,743 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:55:37,743 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:55:37,749 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:55:37,749 INFO L85 PathProgramCache]: Analyzing trace with hash 994857001, now seen corresponding path program 1 times [2021-11-21 01:55:37,759 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:55:37,759 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1158133009] [2021-11-21 01:55:37,760 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:55:37,760 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:55:37,872 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:55:37,936 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:55:37,937 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:55:37,937 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1158133009] [2021-11-21 01:55:37,938 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1158133009] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 01:55:37,938 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 01:55:37,939 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-21 01:55:37,940 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1215801636] [2021-11-21 01:55:37,941 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:55:37,945 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-21 01:55:37,946 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:55:37,972 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-21 01:55:37,973 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-21 01:55:37,975 INFO L87 Difference]: Start difference. First operand has 13 states, 11 states have (on average 1.6363636363636365) internal successors, (18), 12 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 2 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:55:38,007 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:55:38,007 INFO L93 Difference]: Finished difference Result 25 states and 35 transitions. [2021-11-21 01:55:38,009 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-21 01:55:38,010 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 2 states have internal predecessors, (8), 0 states have call successors, (0), 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 8 [2021-11-21 01:55:38,010 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:55:38,017 INFO L225 Difference]: With dead ends: 25 [2021-11-21 01:55:38,018 INFO L226 Difference]: Without dead ends: 11 [2021-11-21 01:55:38,020 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-21 01:55:38,024 INFO L933 BasicCegarLoop]: 11 mSDtfsCounter, 0 mSDsluCounter, 13 mSDsCounter, 0 mSdLazyCounter, 9 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 22 SdHoareTripleChecker+Invalid, 9 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 9 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-21 01:55:38,025 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 22 Invalid, 9 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 9 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-21 01:55:38,041 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 11 states. [2021-11-21 01:55:38,052 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 11 to 11. [2021-11-21 01:55:38,053 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 11 states, 10 states have (on average 1.2) internal successors, (12), 10 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) [2021-11-21 01:55:38,054 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11 states to 11 states and 12 transitions. [2021-11-21 01:55:38,055 INFO L78 Accepts]: Start accepts. Automaton has 11 states and 12 transitions. Word has length 8 [2021-11-21 01:55:38,056 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:55:38,056 INFO L470 AbstractCegarLoop]: Abstraction has 11 states and 12 transitions. [2021-11-21 01:55:38,056 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 2 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:55:38,056 INFO L276 IsEmpty]: Start isEmpty. Operand 11 states and 12 transitions. [2021-11-21 01:55:38,057 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2021-11-21 01:55:38,057 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:55:38,057 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:55:38,057 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-21 01:55:38,058 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:55:38,059 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:55:38,059 INFO L85 PathProgramCache]: Analyzing trace with hash 1531794660, now seen corresponding path program 1 times [2021-11-21 01:55:38,059 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:55:38,059 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1272624437] [2021-11-21 01:55:38,059 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:55:38,060 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:55:38,082 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:55:38,116 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:55:38,116 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:55:38,116 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1272624437] [2021-11-21 01:55:38,117 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1272624437] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:55:38,117 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [231540558] [2021-11-21 01:55:38,117 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:55:38,117 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:55:38,118 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_94c494a0-a6dc-4a19-ba44-aca4f1217779/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:55:38,120 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_94c494a0-a6dc-4a19-ba44-aca4f1217779/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:55:38,154 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_94c494a0-a6dc-4a19-ba44-aca4f1217779/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-21 01:55:38,239 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:55:38,243 INFO L263 TraceCheckSpWp]: Trace formula consists of 108 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-21 01:55:38,247 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:55:38,403 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:55:38,403 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:55:38,462 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:55:38,463 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [231540558] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:55:38,463 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [29394550] [2021-11-21 01:55:38,490 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-21 01:55:38,491 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:55:38,495 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:55:38,501 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:55:38,502 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:55:38,684 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:55:38,696 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:55:38,702 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:55:38,705 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:55:38,961 INFO L354 Elim1Store]: treesize reduction 315, result has 15.5 percent of original size [2021-11-21 01:55:38,962 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 8 select indices, 8 select index equivalence classes, 14 disjoint index pairs (out of 28 index pairs), introduced 8 new quantified variables, introduced 22 case distinctions, treesize of input 80 treesize of output 121 [2021-11-21 01:55:39,132 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:55:39,133 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:55:39,140 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:55:39,141 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:55:39,147 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 24 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 45 [2021-11-21 01:55:39,403 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:55:39,404 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:55:39,407 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 12 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 54 treesize of output 36 [2021-11-21 01:55:39,558 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 27 treesize of output 15 [2021-11-21 01:55:39,637 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 27 treesize of output 15 [2021-11-21 01:55:39,857 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:55:39,858 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:55:39,861 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:55:39,879 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:55:39,974 INFO L354 Elim1Store]: treesize reduction 200, result has 14.2 percent of original size [2021-11-21 01:55:39,975 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 5 case distinctions, treesize of input 489 treesize of output 453 [2021-11-21 01:55:40,039 INFO L354 Elim1Store]: treesize reduction 44, result has 13.7 percent of original size [2021-11-21 01:55:40,041 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 461 treesize of output 439 [2021-11-21 01:55:40,089 INFO L354 Elim1Store]: treesize reduction 44, result has 13.7 percent of original size [2021-11-21 01:55:40,090 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 436 treesize of output 414 [2021-11-21 01:55:40,138 INFO L354 Elim1Store]: treesize reduction 21, result has 38.2 percent of original size [2021-11-21 01:55:40,139 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 411 treesize of output 416 [2021-11-21 01:55:40,173 INFO L354 Elim1Store]: treesize reduction 21, result has 38.2 percent of original size [2021-11-21 01:55:40,174 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 416 treesize of output 421 [2021-11-21 01:55:42,098 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:55:42,111 INFO L354 Elim1Store]: treesize reduction 18, result has 47.1 percent of original size [2021-11-21 01:55:42,112 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 42 treesize of output 29 [2021-11-21 01:55:42,159 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:55:42,171 INFO L354 Elim1Store]: treesize reduction 27, result has 37.2 percent of original size [2021-11-21 01:55:42,172 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 1 case distinctions, treesize of input 60 treesize of output 25 [2021-11-21 01:55:42,236 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:55:42,249 INFO L354 Elim1Store]: treesize reduction 18, result has 47.1 percent of original size [2021-11-21 01:55:42,249 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 42 treesize of output 29 [2021-11-21 01:55:42,379 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:55:42,380 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 80 treesize of output 52 [2021-11-21 01:55:42,398 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:55:42,400 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:55:42,403 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:55:42,404 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 53 treesize of output 27 [2021-11-21 01:55:42,450 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:55:42,452 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:55:42,453 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:55:42,454 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:55:42,458 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:55:42,478 INFO L354 Elim1Store]: treesize reduction 14, result has 54.8 percent of original size [2021-11-21 01:55:42,479 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 187 treesize of output 50 [2021-11-21 01:55:42,552 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:55:42,554 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:55:42,555 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:55:42,562 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:55:42,583 INFO L354 Elim1Store]: treesize reduction 13, result has 45.8 percent of original size [2021-11-21 01:55:42,584 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 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 1 case distinctions, treesize of input 165 treesize of output 42 [2021-11-21 01:55:43,336 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:55:43,793 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSifa [29394550] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 01:55:43,794 INFO L186 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:55:43,794 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [3, 3, 3] total 11 [2021-11-21 01:55:43,795 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [311748496] [2021-11-21 01:55:43,795 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:55:43,796 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-21 01:55:43,796 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:55:43,797 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-21 01:55:43,797 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=97, Unknown=0, NotChecked=0, Total=132 [2021-11-21 01:55:43,798 INFO L87 Difference]: Start difference. First operand 11 states and 12 transitions. Second operand has 7 states, 7 states have (on average 1.4285714285714286) internal successors, (10), 6 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:55:43,843 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:55:43,844 INFO L93 Difference]: Finished difference Result 17 states and 18 transitions. [2021-11-21 01:55:43,844 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-21 01:55:43,844 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 1.4285714285714286) internal successors, (10), 6 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 [2021-11-21 01:55:43,844 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:55:43,845 INFO L225 Difference]: With dead ends: 17 [2021-11-21 01:55:43,845 INFO L226 Difference]: Without dead ends: 13 [2021-11-21 01:55:43,846 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 38 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=35, Invalid=97, Unknown=0, NotChecked=0, Total=132 [2021-11-21 01:55:43,847 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 2 mSDsluCounter, 8 mSDsCounter, 0 mSdLazyCounter, 15 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 11 SdHoareTripleChecker+Invalid, 30 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 15 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 15 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-21 01:55:43,847 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [2 Valid, 11 Invalid, 30 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 15 Invalid, 0 Unknown, 15 Unchecked, 0.0s Time] [2021-11-21 01:55:43,848 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2021-11-21 01:55:43,851 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2021-11-21 01:55:43,851 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 13 states, 12 states have (on average 1.1666666666666667) internal successors, (14), 12 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:55:43,852 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 14 transitions. [2021-11-21 01:55:43,852 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 14 transitions. Word has length 10 [2021-11-21 01:55:43,852 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:55:43,852 INFO L470 AbstractCegarLoop]: Abstraction has 13 states and 14 transitions. [2021-11-21 01:55:43,852 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 1.4285714285714286) internal successors, (10), 6 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:55:43,853 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 14 transitions. [2021-11-21 01:55:43,853 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-11-21 01:55:43,853 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:55:43,853 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:55:43,890 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_94c494a0-a6dc-4a19-ba44-aca4f1217779/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-21 01:55:44,072 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_94c494a0-a6dc-4a19-ba44-aca4f1217779/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:55:44,072 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:55:44,073 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:55:44,073 INFO L85 PathProgramCache]: Analyzing trace with hash -1089883201, now seen corresponding path program 1 times [2021-11-21 01:55:44,073 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:55:44,073 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2107809219] [2021-11-21 01:55:44,073 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:55:44,073 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:55:44,089 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:55:44,117 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-21 01:55:44,117 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:55:44,118 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2107809219] [2021-11-21 01:55:44,118 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2107809219] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:55:44,118 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1458590088] [2021-11-21 01:55:44,118 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:55:44,118 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:55:44,118 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_94c494a0-a6dc-4a19-ba44-aca4f1217779/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:55:44,130 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_94c494a0-a6dc-4a19-ba44-aca4f1217779/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:55:44,152 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_94c494a0-a6dc-4a19-ba44-aca4f1217779/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-21 01:55:44,204 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:55:44,205 INFO L263 TraceCheckSpWp]: Trace formula consists of 113 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-21 01:55:44,207 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:55:44,235 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-21 01:55:44,235 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:55:44,281 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-21 01:55:44,281 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1458590088] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:55:44,281 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [888645491] [2021-11-21 01:55:44,284 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-21 01:55:44,285 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:55:44,285 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:55:44,285 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:55:44,286 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:55:44,363 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:55:44,366 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:55:44,369 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:55:44,375 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:55:44,528 INFO L354 Elim1Store]: treesize reduction 195, result has 25.3 percent of original size [2021-11-21 01:55:44,528 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 8 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 5 case distinctions, treesize of input 31 treesize of output 85 [2021-11-21 01:55:44,631 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:55:44,633 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:55:44,638 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:55:44,641 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:55:44,644 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:55:44,648 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:55:44,650 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:55:44,652 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:55:44,811 INFO L354 Elim1Store]: treesize reduction 315, result has 15.5 percent of original size [2021-11-21 01:55:44,811 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 8 select indices, 8 select index equivalence classes, 14 disjoint index pairs (out of 28 index pairs), introduced 8 new quantified variables, introduced 22 case distinctions, treesize of input 80 treesize of output 121 [2021-11-21 01:55:45,009 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:55:45,021 INFO L354 Elim1Store]: treesize reduction 18, result has 47.1 percent of original size [2021-11-21 01:55:45,022 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 42 treesize of output 29 [2021-11-21 01:55:45,048 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:55:45,060 INFO L354 Elim1Store]: treesize reduction 18, result has 47.1 percent of original size [2021-11-21 01:55:45,060 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 42 treesize of output 29 [2021-11-21 01:55:45,077 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:55:45,090 INFO L354 Elim1Store]: treesize reduction 27, result has 37.2 percent of original size [2021-11-21 01:55:45,091 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 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 60 treesize of output 25 [2021-11-21 01:55:45,185 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:55:45,198 INFO L354 Elim1Store]: treesize reduction 18, result has 47.1 percent of original size [2021-11-21 01:55:45,198 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 42 treesize of output 29 [2021-11-21 01:55:45,230 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:55:45,244 INFO L354 Elim1Store]: treesize reduction 27, result has 37.2 percent of original size [2021-11-21 01:55:45,244 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 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 60 treesize of output 25 [2021-11-21 01:55:45,297 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:55:45,307 INFO L354 Elim1Store]: treesize reduction 18, result has 47.1 percent of original size [2021-11-21 01:55:45,308 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 42 treesize of output 29 [2021-11-21 01:55:45,430 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:55:45,432 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 80 treesize of output 52 [2021-11-21 01:55:45,458 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:55:45,459 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:55:45,461 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:55:45,463 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 53 treesize of output 27 [2021-11-21 01:55:45,492 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:55:45,493 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:55:45,495 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:55:45,495 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:55:45,500 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:55:45,521 INFO L354 Elim1Store]: treesize reduction 14, result has 54.8 percent of original size [2021-11-21 01:55:45,522 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 187 treesize of output 50 [2021-11-21 01:55:45,635 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:55:45,637 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:55:45,638 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:55:45,645 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:55:45,664 INFO L354 Elim1Store]: treesize reduction 13, result has 45.8 percent of original size [2021-11-21 01:55:45,664 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 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 1 case distinctions, treesize of input 165 treesize of output 42 [2021-11-21 01:55:47,068 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:55:47,511 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:55:47,511 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:55:47,511 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3, 3] total 6 [2021-11-21 01:55:47,511 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1752312237] [2021-11-21 01:55:47,511 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:55:47,512 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-21 01:55:47,512 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:55:47,512 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-21 01:55:47,513 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=48, Invalid=162, Unknown=0, NotChecked=0, Total=210 [2021-11-21 01:55:47,513 INFO L87 Difference]: Start difference. First operand 13 states and 14 transitions. Second operand has 7 states, 7 states have (on average 2.2857142857142856) internal successors, (16), 6 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) [2021-11-21 01:55:47,548 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:55:47,549 INFO L93 Difference]: Finished difference Result 26 states and 30 transitions. [2021-11-21 01:55:47,549 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-21 01:55:47,549 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 2.2857142857142856) internal successors, (16), 6 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 12 [2021-11-21 01:55:47,550 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:55:47,550 INFO L225 Difference]: With dead ends: 26 [2021-11-21 01:55:47,550 INFO L226 Difference]: Without dead ends: 16 [2021-11-21 01:55:47,551 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 65 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=48, Invalid=162, Unknown=0, NotChecked=0, Total=210 [2021-11-21 01:55:47,552 INFO L933 BasicCegarLoop]: 7 mSDtfsCounter, 0 mSDsluCounter, 24 mSDsCounter, 0 mSdLazyCounter, 15 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 28 SdHoareTripleChecker+Invalid, 18 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 15 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-21 01:55:47,552 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 28 Invalid, 18 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 15 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-21 01:55:47,553 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2021-11-21 01:55:47,556 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2021-11-21 01:55:47,556 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 16 states, 15 states have (on average 1.1333333333333333) internal successors, (17), 15 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:55:47,557 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 17 transitions. [2021-11-21 01:55:47,557 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 17 transitions. Word has length 12 [2021-11-21 01:55:47,557 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:55:47,557 INFO L470 AbstractCegarLoop]: Abstraction has 16 states and 17 transitions. [2021-11-21 01:55:47,558 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 2.2857142857142856) internal successors, (16), 6 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) [2021-11-21 01:55:47,558 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 17 transitions. [2021-11-21 01:55:47,558 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2021-11-21 01:55:47,558 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:55:47,559 INFO L514 BasicCegarLoop]: trace histogram [4, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:55:47,599 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_94c494a0-a6dc-4a19-ba44-aca4f1217779/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-21 01:55:47,779 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_94c494a0-a6dc-4a19-ba44-aca4f1217779/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:55:47,780 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:55:47,780 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:55:47,780 INFO L85 PathProgramCache]: Analyzing trace with hash -911837772, now seen corresponding path program 2 times [2021-11-21 01:55:47,781 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:55:47,781 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1502246821] [2021-11-21 01:55:47,781 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:55:47,781 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:55:47,834 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:55:47,883 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-21 01:55:47,883 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:55:47,883 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1502246821] [2021-11-21 01:55:47,883 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1502246821] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:55:47,883 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1961282692] [2021-11-21 01:55:47,884 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 01:55:47,884 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:55:47,884 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_94c494a0-a6dc-4a19-ba44-aca4f1217779/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:55:47,885 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_94c494a0-a6dc-4a19-ba44-aca4f1217779/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:55:47,912 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_94c494a0-a6dc-4a19-ba44-aca4f1217779/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-21 01:55:47,989 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-11-21 01:55:47,989 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:55:47,990 INFO L263 TraceCheckSpWp]: Trace formula consists of 123 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-21 01:55:47,993 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:55:48,131 INFO L354 Elim1Store]: treesize reduction 73, result has 44.7 percent of original size [2021-11-21 01:55:48,131 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 2 case distinctions, treesize of input 241 treesize of output 217 [2021-11-21 01:55:48,198 INFO L354 Elim1Store]: treesize reduction 70, result has 43.1 percent of original size [2021-11-21 01:55:48,199 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 2 case distinctions, treesize of input 217 treesize of output 207 [2021-11-21 01:55:48,327 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-21 01:55:48,327 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 6 new quantified variables, introduced 3 case distinctions, treesize of input 164 treesize of output 121 [2021-11-21 01:55:48,343 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-21 01:55:48,343 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 5 new quantified variables, introduced 3 case distinctions, treesize of input 109 treesize of output 103 [2021-11-21 01:55:48,613 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 17 treesize of output 9 [2021-11-21 01:55:48,633 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-21 01:55:48,634 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:55:48,707 INFO L354 Elim1Store]: treesize reduction 4, result has 93.0 percent of original size [2021-11-21 01:55:48,707 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 59 treesize of output 59 [2021-11-21 01:55:50,783 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-21 01:55:50,783 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1961282692] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:55:50,784 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1366119645] [2021-11-21 01:55:50,786 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-21 01:55:50,786 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:55:50,786 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:55:50,787 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:55:50,787 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:55:50,838 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:55:50,853 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:55:50,854 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:55:50,855 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:55:51,017 INFO L354 Elim1Store]: treesize reduction 195, result has 25.3 percent of original size [2021-11-21 01:55:51,018 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 12 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 5 case distinctions, treesize of input 31 treesize of output 85 [2021-11-21 01:55:51,152 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:55:51,157 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:55:51,160 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:55:51,163 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:55:51,165 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:55:51,167 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:55:51,170 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:55:51,334 INFO L354 Elim1Store]: treesize reduction 315, result has 15.5 percent of original size [2021-11-21 01:55:51,334 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 8 select indices, 8 select index equivalence classes, 14 disjoint index pairs (out of 28 index pairs), introduced 8 new quantified variables, introduced 22 case distinctions, treesize of input 80 treesize of output 121 [2021-11-21 01:55:51,513 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:55:51,526 INFO L354 Elim1Store]: treesize reduction 27, result has 37.2 percent of original size [2021-11-21 01:55:51,526 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 60 treesize of output 25 [2021-11-21 01:55:51,585 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:55:51,598 INFO L354 Elim1Store]: treesize reduction 18, result has 47.1 percent of original size [2021-11-21 01:55:51,599 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 42 treesize of output 29 [2021-11-21 01:55:51,676 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:55:51,688 INFO L354 Elim1Store]: treesize reduction 18, result has 47.1 percent of original size [2021-11-21 01:55:51,688 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 42 treesize of output 29 [2021-11-21 01:55:51,752 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:55:51,766 INFO L354 Elim1Store]: treesize reduction 18, result has 47.1 percent of original size [2021-11-21 01:55:51,767 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 42 treesize of output 29 [2021-11-21 01:55:51,795 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:55:51,811 INFO L354 Elim1Store]: treesize reduction 18, result has 47.1 percent of original size [2021-11-21 01:55:51,811 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 42 treesize of output 29 [2021-11-21 01:55:51,849 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:55:51,859 INFO L354 Elim1Store]: treesize reduction 27, result has 37.2 percent of original size [2021-11-21 01:55:51,860 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 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 60 treesize of output 25 [2021-11-21 01:55:52,005 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:55:52,006 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:55:52,006 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:55:52,010 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:55:52,030 INFO L354 Elim1Store]: treesize reduction 13, result has 45.8 percent of original size [2021-11-21 01:55:52,030 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 165 treesize of output 42 [2021-11-21 01:55:52,090 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:55:52,091 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 80 treesize of output 52 [2021-11-21 01:55:52,113 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:55:52,115 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:55:52,117 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:55:52,119 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 53 treesize of output 27 [2021-11-21 01:55:52,218 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:55:52,220 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:55:52,221 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:55:52,222 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:55:52,228 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:55:52,250 INFO L354 Elim1Store]: treesize reduction 14, result has 54.8 percent of original size [2021-11-21 01:55:52,251 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 187 treesize of output 50 [2021-11-21 01:55:53,580 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:55:54,177 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:55:54,177 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:55:54,177 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 15 [2021-11-21 01:55:54,177 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1140308617] [2021-11-21 01:55:54,177 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:55:54,178 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2021-11-21 01:55:54,178 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:55:54,178 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-11-21 01:55:54,179 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=431, Unknown=1, NotChecked=0, Total=506 [2021-11-21 01:55:54,179 INFO L87 Difference]: Start difference. First operand 16 states and 17 transitions. Second operand has 15 states, 15 states have (on average 1.9333333333333333) internal successors, (29), 15 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:55:54,311 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:55:54,311 INFO L93 Difference]: Finished difference Result 33 states and 38 transitions. [2021-11-21 01:55:54,311 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2021-11-21 01:55:54,312 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.9333333333333333) internal successors, (29), 15 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 15 [2021-11-21 01:55:54,312 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:55:54,312 INFO L225 Difference]: With dead ends: 33 [2021-11-21 01:55:54,312 INFO L226 Difference]: Without dead ends: 23 [2021-11-21 01:55:54,313 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 28 SyntacticMatches, 0 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 161 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=104, Invalid=597, Unknown=1, NotChecked=0, Total=702 [2021-11-21 01:55:54,314 INFO L933 BasicCegarLoop]: 4 mSDtfsCounter, 6 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 56 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 20 SdHoareTripleChecker+Invalid, 60 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 56 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 1 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 01:55:54,315 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [6 Valid, 20 Invalid, 60 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 56 Invalid, 0 Unknown, 1 Unchecked, 0.1s Time] [2021-11-21 01:55:54,316 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2021-11-21 01:55:54,320 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2021-11-21 01:55:54,320 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23 states, 22 states have (on average 1.0909090909090908) internal successors, (24), 22 states have internal predecessors, (24), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:55:54,321 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 24 transitions. [2021-11-21 01:55:54,321 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 24 transitions. Word has length 15 [2021-11-21 01:55:54,321 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:55:54,321 INFO L470 AbstractCegarLoop]: Abstraction has 23 states and 24 transitions. [2021-11-21 01:55:54,322 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 15 states have (on average 1.9333333333333333) internal successors, (29), 15 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:55:54,322 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 24 transitions. [2021-11-21 01:55:54,322 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-11-21 01:55:54,322 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:55:54,323 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 4, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:55:54,345 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_94c494a0-a6dc-4a19-ba44-aca4f1217779/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Ended with exit code 0 [2021-11-21 01:55:54,532 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_94c494a0-a6dc-4a19-ba44-aca4f1217779/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:55:54,532 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:55:54,533 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:55:54,533 INFO L85 PathProgramCache]: Analyzing trace with hash -1639260912, now seen corresponding path program 3 times [2021-11-21 01:55:54,533 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:55:54,533 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1541141577] [2021-11-21 01:55:54,533 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:55:54,533 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:55:54,574 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:55:54,637 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2021-11-21 01:55:54,638 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:55:54,638 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1541141577] [2021-11-21 01:55:54,638 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1541141577] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:55:54,638 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1381655148] [2021-11-21 01:55:54,638 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-21 01:55:54,639 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:55:54,639 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_94c494a0-a6dc-4a19-ba44-aca4f1217779/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:55:54,648 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_94c494a0-a6dc-4a19-ba44-aca4f1217779/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:55:54,649 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_94c494a0-a6dc-4a19-ba44-aca4f1217779/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-21 01:55:54,690 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-21 01:55:54,690 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:55:54,691 INFO L263 TraceCheckSpWp]: Trace formula consists of 47 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-21 01:55:54,693 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:55:54,803 INFO L354 Elim1Store]: treesize reduction 70, result has 43.1 percent of original size [2021-11-21 01:55:54,804 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 2 case distinctions, treesize of input 241 treesize of output 231 [2021-11-21 01:55:54,872 INFO L354 Elim1Store]: treesize reduction 73, result has 44.7 percent of original size [2021-11-21 01:55:54,872 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 2 case distinctions, treesize of input 231 treesize of output 207 [2021-11-21 01:55:54,989 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-21 01:55:54,989 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 6 new quantified variables, introduced 3 case distinctions, treesize of input 164 treesize of output 121 [2021-11-21 01:55:55,011 INFO L354 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2021-11-21 01:55:55,012 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 5 new quantified variables, introduced 3 case distinctions, treesize of input 109 treesize of output 103 [2021-11-21 01:55:55,538 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 17 treesize of output 9 [2021-11-21 01:55:55,554 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-21 01:55:55,554 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:55:55,690 INFO L354 Elim1Store]: treesize reduction 4, result has 93.0 percent of original size [2021-11-21 01:55:55,690 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 59 treesize of output 59 [2021-11-21 01:55:55,938 INFO L134 CoverageAnalysis]: Checked inductivity of 35 backedges. 0 proven. 20 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-21 01:55:55,938 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1381655148] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:55:55,939 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1041346056] [2021-11-21 01:55:55,941 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-21 01:55:55,941 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:55:55,942 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:55:55,942 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:55:55,942 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:55:55,996 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:55:56,000 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:55:56,002 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:55:56,004 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:55:56,006 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:55:56,008 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:55:56,010 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:55:56,168 INFO L354 Elim1Store]: treesize reduction 315, result has 15.5 percent of original size [2021-11-21 01:55:56,168 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 8 select indices, 8 select index equivalence classes, 14 disjoint index pairs (out of 28 index pairs), introduced 8 new quantified variables, introduced 22 case distinctions, treesize of input 80 treesize of output 121 [2021-11-21 01:55:56,248 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:55:56,249 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:55:56,250 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:55:56,251 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:55:56,258 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 23 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 45 [2021-11-21 01:55:56,410 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:55:56,410 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:55:56,411 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 8 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 74 treesize of output 41 [2021-11-21 01:55:56,444 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 5 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 42 treesize of output 25 [2021-11-21 01:55:56,545 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 42 treesize of output 25 [2021-11-21 01:55:56,684 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:55:56,688 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:55:56,689 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:55:56,690 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:55:56,691 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:55:56,693 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:55:56,741 INFO L354 Elim1Store]: treesize reduction 135, result has 12.9 percent of original size [2021-11-21 01:55:56,741 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 509 treesize of output 462 [2021-11-21 01:55:56,761 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:55:56,763 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 476 treesize of output 454 [2021-11-21 01:55:56,780 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:55:56,781 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 451 treesize of output 450 [2021-11-21 01:55:56,800 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:55:56,801 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 447 treesize of output 425 [2021-11-21 01:55:56,819 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:55:56,820 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 422 treesize of output 421 [2021-11-21 01:55:57,431 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:55:57,443 INFO L354 Elim1Store]: treesize reduction 18, result has 47.1 percent of original size [2021-11-21 01:55:57,443 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 1 case distinctions, treesize of input 42 treesize of output 29 [2021-11-21 01:55:57,464 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:55:57,476 INFO L354 Elim1Store]: treesize reduction 27, result has 37.2 percent of original size [2021-11-21 01:55:57,476 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 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 60 treesize of output 25 [2021-11-21 01:55:57,524 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:55:57,536 INFO L354 Elim1Store]: treesize reduction 18, result has 47.1 percent of original size [2021-11-21 01:55:57,536 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 42 treesize of output 29 [2021-11-21 01:55:57,702 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:55:57,703 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:55:57,704 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:55:57,708 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:55:57,725 INFO L354 Elim1Store]: treesize reduction 13, result has 45.8 percent of original size [2021-11-21 01:55:57,725 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 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 1 case distinctions, treesize of input 165 treesize of output 42 [2021-11-21 01:55:57,778 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:55:57,778 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 80 treesize of output 52 [2021-11-21 01:55:57,793 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:55:57,794 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:55:57,796 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:55:57,797 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 53 treesize of output 27 [2021-11-21 01:55:57,843 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:55:57,844 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:55:57,845 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:55:57,846 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:55:57,850 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:55:57,867 INFO L354 Elim1Store]: treesize reduction 14, result has 54.8 percent of original size [2021-11-21 01:55:57,868 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 187 treesize of output 50 [2021-11-21 01:55:59,342 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:56:01,189 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:56:01,190 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:56:01,190 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 9, 9] total 22 [2021-11-21 01:56:01,190 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [750107827] [2021-11-21 01:56:01,190 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:56:01,191 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2021-11-21 01:56:01,191 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:56:01,191 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-11-21 01:56:01,192 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=132, Invalid=738, Unknown=0, NotChecked=0, Total=870 [2021-11-21 01:56:01,192 INFO L87 Difference]: Start difference. First operand 23 states and 24 transitions. Second operand has 22 states, 22 states have (on average 1.9090909090909092) internal successors, (42), 22 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) [2021-11-21 01:56:01,500 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:56:01,500 INFO L93 Difference]: Finished difference Result 52 states and 60 transitions. [2021-11-21 01:56:01,500 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2021-11-21 01:56:01,501 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 1.9090909090909092) internal successors, (42), 22 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 22 [2021-11-21 01:56:01,501 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:56:01,501 INFO L225 Difference]: With dead ends: 52 [2021-11-21 01:56:01,501 INFO L226 Difference]: Without dead ends: 36 [2021-11-21 01:56:01,502 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 81 GetRequests, 43 SyntacticMatches, 0 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 372 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=267, Invalid=1293, Unknown=0, NotChecked=0, Total=1560 [2021-11-21 01:56:01,503 INFO L933 BasicCegarLoop]: 4 mSDtfsCounter, 15 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 69 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 15 SdHoareTripleChecker+Valid, 20 SdHoareTripleChecker+Invalid, 76 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 69 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 1 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 01:56:01,503 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [15 Valid, 20 Invalid, 76 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 69 Invalid, 0 Unknown, 1 Unchecked, 0.1s Time] [2021-11-21 01:56:01,504 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2021-11-21 01:56:01,509 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2021-11-21 01:56:01,510 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 36 states, 35 states have (on average 1.0571428571428572) internal successors, (37), 35 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:56:01,511 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 37 transitions. [2021-11-21 01:56:01,511 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 37 transitions. Word has length 22 [2021-11-21 01:56:01,511 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:56:01,511 INFO L470 AbstractCegarLoop]: Abstraction has 36 states and 37 transitions. [2021-11-21 01:56:01,512 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 22 states have (on average 1.9090909090909092) internal successors, (42), 22 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) [2021-11-21 01:56:01,512 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 37 transitions. [2021-11-21 01:56:01,513 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2021-11-21 01:56:01,513 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:56:01,513 INFO L514 BasicCegarLoop]: trace histogram [11, 10, 6, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:56:01,534 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_94c494a0-a6dc-4a19-ba44-aca4f1217779/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-21 01:56:01,716 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_94c494a0-a6dc-4a19-ba44-aca4f1217779/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:56:01,716 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:56:01,718 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:56:01,718 INFO L85 PathProgramCache]: Analyzing trace with hash -848017977, now seen corresponding path program 4 times [2021-11-21 01:56:01,718 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:56:01,718 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1773525991] [2021-11-21 01:56:01,718 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:56:01,719 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:56:01,766 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:56:01,856 INFO L134 CoverageAnalysis]: Checked inductivity of 131 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 110 trivial. 0 not checked. [2021-11-21 01:56:01,856 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:56:01,856 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1773525991] [2021-11-21 01:56:01,857 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1773525991] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:56:01,857 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [344308303] [2021-11-21 01:56:01,857 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-21 01:56:01,857 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:56:01,857 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_94c494a0-a6dc-4a19-ba44-aca4f1217779/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:56:01,864 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_94c494a0-a6dc-4a19-ba44-aca4f1217779/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:56:01,884 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_94c494a0-a6dc-4a19-ba44-aca4f1217779/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-21 01:56:01,937 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:56:01,939 INFO L263 TraceCheckSpWp]: Trace formula consists of 208 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-21 01:56:01,941 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:56:02,024 INFO L134 CoverageAnalysis]: Checked inductivity of 131 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 110 trivial. 0 not checked. [2021-11-21 01:56:02,024 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:56:02,151 INFO L134 CoverageAnalysis]: Checked inductivity of 131 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 110 trivial. 0 not checked. [2021-11-21 01:56:02,151 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [344308303] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:56:02,151 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [704641960] [2021-11-21 01:56:02,154 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2021-11-21 01:56:02,154 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:56:02,154 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:56:02,154 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:56:02,155 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:56:02,209 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:56:02,210 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:56:02,211 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:56:02,212 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:56:02,364 INFO L354 Elim1Store]: treesize reduction 195, result has 25.3 percent of original size [2021-11-21 01:56:02,364 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 9 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 5 case distinctions, treesize of input 31 treesize of output 85 [2021-11-21 01:56:02,463 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:56:02,468 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:56:02,471 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:56:02,474 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:56:02,477 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:56:02,479 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:56:02,482 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:56:02,647 INFO L354 Elim1Store]: treesize reduction 315, result has 15.5 percent of original size [2021-11-21 01:56:02,648 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 8 select indices, 8 select index equivalence classes, 14 disjoint index pairs (out of 28 index pairs), introduced 8 new quantified variables, introduced 22 case distinctions, treesize of input 80 treesize of output 121 [2021-11-21 01:56:02,866 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:56:02,880 INFO L354 Elim1Store]: treesize reduction 18, result has 47.1 percent of original size [2021-11-21 01:56:02,880 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 42 treesize of output 29 [2021-11-21 01:56:02,921 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:56:02,934 INFO L354 Elim1Store]: treesize reduction 27, result has 37.2 percent of original size [2021-11-21 01:56:02,935 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 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 60 treesize of output 25 [2021-11-21 01:56:02,982 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:56:02,992 INFO L354 Elim1Store]: treesize reduction 18, result has 47.1 percent of original size [2021-11-21 01:56:02,993 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 42 treesize of output 29 [2021-11-21 01:56:03,025 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:56:03,037 INFO L354 Elim1Store]: treesize reduction 27, result has 37.2 percent of original size [2021-11-21 01:56:03,037 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 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 60 treesize of output 25 [2021-11-21 01:56:03,109 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:56:03,132 INFO L354 Elim1Store]: treesize reduction 18, result has 47.1 percent of original size [2021-11-21 01:56:03,132 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 42 treesize of output 29 [2021-11-21 01:56:03,243 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:56:03,256 INFO L354 Elim1Store]: treesize reduction 18, result has 47.1 percent of original size [2021-11-21 01:56:03,256 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 42 treesize of output 29 [2021-11-21 01:56:03,352 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:56:03,353 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 80 treesize of output 52 [2021-11-21 01:56:03,367 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:56:03,368 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:56:03,370 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:56:03,371 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 53 treesize of output 27 [2021-11-21 01:56:03,395 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:56:03,396 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:56:03,396 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:56:03,401 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:56:03,414 INFO L354 Elim1Store]: treesize reduction 13, result has 45.8 percent of original size [2021-11-21 01:56:03,415 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 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 1 case distinctions, treesize of input 165 treesize of output 42 [2021-11-21 01:56:03,514 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:56:03,515 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:56:03,517 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:56:03,517 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-21 01:56:03,523 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-21 01:56:03,541 INFO L354 Elim1Store]: treesize reduction 14, result has 54.8 percent of original size [2021-11-21 01:56:03,541 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 4 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 1 case distinctions, treesize of input 187 treesize of output 50 [2021-11-21 01:56:05,007 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:56:05,543 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:56:05,543 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:56:05,544 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 12 [2021-11-21 01:56:05,544 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [847934568] [2021-11-21 01:56:05,544 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:56:05,545 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2021-11-21 01:56:05,545 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:56:05,545 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-11-21 01:56:05,545 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=105, Invalid=315, Unknown=0, NotChecked=0, Total=420 [2021-11-21 01:56:05,546 INFO L87 Difference]: Start difference. First operand 36 states and 37 transitions. Second operand has 13 states, 13 states have (on average 1.7692307692307692) internal successors, (23), 12 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:56:05,591 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:56:05,591 INFO L93 Difference]: Finished difference Result 68 states and 73 transitions. [2021-11-21 01:56:05,592 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-21 01:56:05,592 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 1.7692307692307692) internal successors, (23), 12 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 35 [2021-11-21 01:56:05,593 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:56:05,593 INFO L225 Difference]: With dead ends: 68 [2021-11-21 01:56:05,593 INFO L226 Difference]: Without dead ends: 40 [2021-11-21 01:56:05,594 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 111 GetRequests, 91 SyntacticMatches, 1 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 138 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=105, Invalid=315, Unknown=0, NotChecked=0, Total=420 [2021-11-21 01:56:05,595 INFO L933 BasicCegarLoop]: 7 mSDtfsCounter, 0 mSDsluCounter, 24 mSDsCounter, 0 mSdLazyCounter, 21 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 28 SdHoareTripleChecker+Invalid, 22 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 21 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-21 01:56:05,595 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 28 Invalid, 22 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 21 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-21 01:56:05,595 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2021-11-21 01:56:05,604 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 40. [2021-11-21 01:56:05,605 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40 states, 39 states have (on average 1.0512820512820513) internal successors, (41), 39 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) [2021-11-21 01:56:05,607 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 41 transitions. [2021-11-21 01:56:05,607 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 41 transitions. Word has length 35 [2021-11-21 01:56:05,608 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:56:05,608 INFO L470 AbstractCegarLoop]: Abstraction has 40 states and 41 transitions. [2021-11-21 01:56:05,608 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 1.7692307692307692) internal successors, (23), 12 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-21 01:56:05,608 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 41 transitions. [2021-11-21 01:56:05,610 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2021-11-21 01:56:05,610 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:56:05,610 INFO L514 BasicCegarLoop]: trace histogram [11, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:56:05,643 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_94c494a0-a6dc-4a19-ba44-aca4f1217779/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-21 01:56:05,832 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_94c494a0-a6dc-4a19-ba44-aca4f1217779/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2021-11-21 01:56:05,832 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:56:05,833 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:56:05,833 INFO L85 PathProgramCache]: Analyzing trace with hash -8036217, now seen corresponding path program 5 times [2021-11-21 01:56:05,833 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:56:05,833 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1279989571] [2021-11-21 01:56:05,833 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:56:05,833 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:56:06,914 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:56:13,943 INFO L134 CoverageAnalysis]: Checked inductivity of 165 backedges. 0 proven. 165 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:56:13,943 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:56:13,943 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1279989571] [2021-11-21 01:56:13,944 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1279989571] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:56:13,944 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [225803818] [2021-11-21 01:56:13,944 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-21 01:56:13,944 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:56:13,944 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_94c494a0-a6dc-4a19-ba44-aca4f1217779/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:56:13,945 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_94c494a0-a6dc-4a19-ba44-aca4f1217779/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:56:13,961 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_94c494a0-a6dc-4a19-ba44-aca4f1217779/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-21 01:56:14,088 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-11-21 01:56:14,088 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-21 01:56:14,090 INFO L263 TraceCheckSpWp]: Trace formula consists of 148 conjuncts, 36 conjunts are in the unsatisfiable core [2021-11-21 01:56:14,093 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:56:14,103 INFO L354 Elim1Store]: treesize reduction 24, result has 4.0 percent of original size [2021-11-21 01:56:14,103 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 40 treesize of output 34 [2021-11-21 01:56:14,435 INFO L354 Elim1Store]: treesize reduction 103, result has 16.3 percent of original size [2021-11-21 01:56:14,436 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 2 case distinctions, treesize of input 344 treesize of output 301 [2021-11-21 01:56:14,467 INFO L354 Elim1Store]: treesize reduction 131, result has 17.6 percent of original size [2021-11-21 01:56:14,467 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 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 616 treesize of output 498 [2021-11-21 01:56:14,507 INFO L354 Elim1Store]: treesize reduction 217, result has 16.5 percent of original size [2021-11-21 01:56:14,507 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 2 case distinctions, treesize of input 498 treesize of output 338 [2021-11-21 01:56:14,548 INFO L354 Elim1Store]: treesize reduction 664, result has 13.2 percent of original size [2021-11-21 01:56:14,548 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 2 case distinctions, treesize of input 417 treesize of output 376 [2021-11-21 01:56:16,851 INFO L354 Elim1Store]: treesize reduction 134, result has 5.0 percent of original size [2021-11-21 01:56:16,851 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 11 new quantified variables, introduced 10 case distinctions, treesize of input 613 treesize of output 317 [2021-11-21 01:56:16,885 INFO L354 Elim1Store]: treesize reduction 106, result has 6.2 percent of original size [2021-11-21 01:56:16,885 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 9 new quantified variables, introduced 10 case distinctions, treesize of input 246 treesize of output 107 [2021-11-21 01:56:16,893 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 52 treesize of output 28 [2021-11-21 01:56:16,909 INFO L134 CoverageAnalysis]: Checked inductivity of 165 backedges. 19 proven. 10 refuted. 0 times theorem prover too weak. 136 trivial. 0 not checked. [2021-11-21 01:56:16,909 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:56:19,810 INFO L354 Elim1Store]: treesize reduction 1682, result has 28.8 percent of original size [2021-11-21 01:56:19,811 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 7 select indices, 7 select index equivalence classes, 0 disjoint index pairs (out of 21 index pairs), introduced 8 new quantified variables, introduced 21 case distinctions, treesize of input 149850 treesize of output 142526 [2021-11-21 01:56:31,211 WARN L227 SmtUtils]: Spent 10.80s on a formula simplification. DAG size of input: 410 DAG size of output: 188 (called from [L 351] de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.arrays.Elim1Store.elim1) [2021-11-21 01:56:31,212 INFO L354 Elim1Store]: treesize reduction 1124, result has 29.5 percent of original size [2021-11-21 01:56:31,219 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 16 select indices, 16 select index equivalence classes, 0 disjoint index pairs (out of 120 index pairs), introduced 17 new quantified variables, introduced 120 case distinctions, treesize of input 3168246 treesize of output 3015842 [2021-11-21 01:58:46,786 WARN L227 SmtUtils]: Spent 2.26m on a formula simplification. DAG size of input: 4812 DAG size of output: 4809 (called from [L1066] de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher.simplify) [2021-11-21 01:58:57,986 WARN L227 SmtUtils]: Spent 11.17s on a formula simplification that was a NOOP. DAG size: 4796 (called from [L1066] de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher.simplify) [2021-11-21 01:59:09,305 WARN L227 SmtUtils]: Spent 11.09s on a formula simplification that was a NOOP. DAG size: 4800 (called from [L 179] de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher.eliminate) [2021-11-21 01:59:18,926 WARN L227 SmtUtils]: Spent 9.60s on a formula simplification that was a NOOP. DAG size: 4552 (called from [L1066] de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher.simplify) [2021-11-21 01:59:29,980 WARN L227 SmtUtils]: Spent 11.04s on a formula simplification that was a NOOP. DAG size: 4792 (called from [L 184] de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher.eliminate) [2021-11-21 01:59:41,132 WARN L227 SmtUtils]: Spent 10.98s on a formula simplification that was a NOOP. DAG size: 4792 (called from [L1066] de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher.simplify) [2021-11-21 01:59:52,317 WARN L227 SmtUtils]: Spent 11.04s on a formula simplification that was a NOOP. DAG size: 4796 (called from [L 179] de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher.eliminate) [2021-11-21 02:00:01,863 WARN L227 SmtUtils]: Spent 9.52s on a formula simplification that was a NOOP. DAG size: 4557 (called from [L1066] de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher.simplify) [2021-11-21 02:00:12,944 WARN L227 SmtUtils]: Spent 11.07s on a formula simplification that was a NOOP. DAG size: 4788 (called from [L 184] de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher.eliminate) [2021-11-21 02:00:24,181 WARN L227 SmtUtils]: Spent 11.07s on a formula simplification that was a NOOP. DAG size: 4788 (called from [L1066] de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher.simplify) [2021-11-21 02:00:35,947 WARN L227 SmtUtils]: Spent 11.60s on a formula simplification that was a NOOP. DAG size: 4792 (called from [L 179] de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher.eliminate) [2021-11-21 02:00:45,665 WARN L227 SmtUtils]: Spent 9.69s on a formula simplification that was a NOOP. DAG size: 4564 (called from [L1066] de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher.simplify) [2021-11-21 02:00:56,738 WARN L227 SmtUtils]: Spent 11.06s on a formula simplification that was a NOOP. DAG size: 4784 (called from [L 184] de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher.eliminate) [2021-11-21 02:01:07,926 WARN L227 SmtUtils]: Spent 11.02s on a formula simplification that was a NOOP. DAG size: 4784 (called from [L1066] de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher.simplify)