./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/array-crafted/zero_sum_m3.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_73fd7ef1-177b-4e6a-8abd-c8718fa70b47/bin/utaipan-TEXQjIfE4P/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73fd7ef1-177b-4e6a-8abd-c8718fa70b47/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_73fd7ef1-177b-4e6a-8abd-c8718fa70b47/bin/utaipan-TEXQjIfE4P/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73fd7ef1-177b-4e6a-8abd-c8718fa70b47/bin/utaipan-TEXQjIfE4P/config/TaipanReach.xml -i ../../sv-benchmarks/c/array-crafted/zero_sum_m3.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73fd7ef1-177b-4e6a-8abd-c8718fa70b47/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_73fd7ef1-177b-4e6a-8abd-c8718fa70b47/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 1743decb4413dd023f2c21969cafbefd9f03a99467b1795f9affedc42875deb2 --- Real Ultimate output --- This is Ultimate 0.2.1-dev-53f42b1 [2021-11-20 23:17:37,178 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-20 23:17:37,181 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-20 23:17:37,238 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-20 23:17:37,239 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-20 23:17:37,245 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-20 23:17:37,248 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-20 23:17:37,253 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-20 23:17:37,257 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-20 23:17:37,268 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-20 23:17:37,270 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-20 23:17:37,272 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-20 23:17:37,273 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-20 23:17:37,277 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-20 23:17:37,282 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-20 23:17:37,289 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-20 23:17:37,293 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-20 23:17:37,295 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-20 23:17:37,298 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-20 23:17:37,303 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-20 23:17:37,311 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-20 23:17:37,313 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-20 23:17:37,318 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-20 23:17:37,319 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-20 23:17:37,328 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-20 23:17:37,329 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-20 23:17:37,330 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-20 23:17:37,333 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-20 23:17:37,334 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-20 23:17:37,336 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-20 23:17:37,337 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-20 23:17:37,338 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-20 23:17:37,341 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-20 23:17:37,342 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-20 23:17:37,344 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-20 23:17:37,345 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-20 23:17:37,346 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-20 23:17:37,346 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-20 23:17:37,346 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-20 23:17:37,348 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-20 23:17:37,349 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-20 23:17:37,350 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73fd7ef1-177b-4e6a-8abd-c8718fa70b47/bin/utaipan-TEXQjIfE4P/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-20 23:17:37,412 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-20 23:17:37,412 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-20 23:17:37,413 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-20 23:17:37,413 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-20 23:17:37,414 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-20 23:17:37,414 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-20 23:17:37,415 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-20 23:17:37,415 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-20 23:17:37,415 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-20 23:17:37,416 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-20 23:17:37,416 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-20 23:17:37,416 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-20 23:17:37,416 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-20 23:17:37,417 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-20 23:17:37,417 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-20 23:17:37,417 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-20 23:17:37,418 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-20 23:17:37,418 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-20 23:17:37,419 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-20 23:17:37,419 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-20 23:17:37,420 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-20 23:17:37,420 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-20 23:17:37,420 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-20 23:17:37,421 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-20 23:17:37,421 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-20 23:17:37,421 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-20 23:17:37,422 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-20 23:17:37,422 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-20 23:17:37,422 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-20 23:17:37,422 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-20 23:17:37,423 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-20 23:17:37,423 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-20 23:17:37,423 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-20 23:17:37,424 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-20 23:17:37,424 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-20 23:17:37,424 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-20 23:17:37,425 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-20 23:17:37,425 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-20 23:17:37,425 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-20 23:17:37,425 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-20 23:17:37,426 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-20 23:17:37,426 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_73fd7ef1-177b-4e6a-8abd-c8718fa70b47/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73fd7ef1-177b-4e6a-8abd-c8718fa70b47/bin/utaipan-TEXQjIfE4P Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 1743decb4413dd023f2c21969cafbefd9f03a99467b1795f9affedc42875deb2 [2021-11-20 23:17:37,808 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-20 23:17:37,838 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-20 23:17:37,842 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-20 23:17:37,843 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-20 23:17:37,845 INFO L275 PluginConnector]: CDTParser initialized [2021-11-20 23:17:37,846 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73fd7ef1-177b-4e6a-8abd-c8718fa70b47/bin/utaipan-TEXQjIfE4P/../../sv-benchmarks/c/array-crafted/zero_sum_m3.c [2021-11-20 23:17:37,925 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73fd7ef1-177b-4e6a-8abd-c8718fa70b47/bin/utaipan-TEXQjIfE4P/data/ef96cfbb5/9709047f4fd44f7696fe5375052b1da3/FLAGad04115ca [2021-11-20 23:17:38,470 INFO L306 CDTParser]: Found 1 translation units. [2021-11-20 23:17:38,471 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73fd7ef1-177b-4e6a-8abd-c8718fa70b47/sv-benchmarks/c/array-crafted/zero_sum_m3.c [2021-11-20 23:17:38,492 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73fd7ef1-177b-4e6a-8abd-c8718fa70b47/bin/utaipan-TEXQjIfE4P/data/ef96cfbb5/9709047f4fd44f7696fe5375052b1da3/FLAGad04115ca [2021-11-20 23:17:38,827 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73fd7ef1-177b-4e6a-8abd-c8718fa70b47/bin/utaipan-TEXQjIfE4P/data/ef96cfbb5/9709047f4fd44f7696fe5375052b1da3 [2021-11-20 23:17:38,830 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-20 23:17:38,832 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-20 23:17:38,834 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-20 23:17:38,835 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-20 23:17:38,851 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-20 23:17:38,852 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.11 11:17:38" (1/1) ... [2021-11-20 23:17:38,854 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3e5ca320 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:17:38, skipping insertion in model container [2021-11-20 23:17:38,854 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.11 11:17:38" (1/1) ... [2021-11-20 23:17:38,863 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-20 23:17:38,889 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-20 23:17:39,093 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_73fd7ef1-177b-4e6a-8abd-c8718fa70b47/sv-benchmarks/c/array-crafted/zero_sum_m3.c[402,415] [2021-11-20 23:17:39,117 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-20 23:17:39,126 INFO L203 MainTranslator]: Completed pre-run [2021-11-20 23:17:39,141 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_73fd7ef1-177b-4e6a-8abd-c8718fa70b47/sv-benchmarks/c/array-crafted/zero_sum_m3.c[402,415] [2021-11-20 23:17:39,154 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-20 23:17:39,171 INFO L208 MainTranslator]: Completed translation [2021-11-20 23:17:39,172 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:17:39 WrapperNode [2021-11-20 23:17:39,172 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-20 23:17:39,174 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-20 23:17:39,174 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-20 23:17:39,174 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-20 23:17:39,184 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:17:39" (1/1) ... [2021-11-20 23:17:39,194 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:17:39" (1/1) ... [2021-11-20 23:17:39,233 INFO L137 Inliner]: procedures = 15, calls = 17, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 105 [2021-11-20 23:17:39,234 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-20 23:17:39,235 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-20 23:17:39,235 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-20 23:17:39,235 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-20 23:17:39,248 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:17:39" (1/1) ... [2021-11-20 23:17:39,249 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:17:39" (1/1) ... [2021-11-20 23:17:39,253 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:17:39" (1/1) ... [2021-11-20 23:17:39,255 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:17:39" (1/1) ... [2021-11-20 23:17:39,268 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:17:39" (1/1) ... [2021-11-20 23:17:39,285 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:17:39" (1/1) ... [2021-11-20 23:17:39,291 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:17:39" (1/1) ... [2021-11-20 23:17:39,302 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-20 23:17:39,303 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-20 23:17:39,303 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-20 23:17:39,304 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-20 23:17:39,310 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:17:39" (1/1) ... [2021-11-20 23:17:39,319 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-20 23:17:39,336 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73fd7ef1-177b-4e6a-8abd-c8718fa70b47/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:17:39,363 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73fd7ef1-177b-4e6a-8abd-c8718fa70b47/bin/utaipan-TEXQjIfE4P/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-20 23:17:39,392 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73fd7ef1-177b-4e6a-8abd-c8718fa70b47/bin/utaipan-TEXQjIfE4P/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-20 23:17:39,430 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-20 23:17:39,431 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-20 23:17:39,432 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-11-20 23:17:39,432 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2021-11-20 23:17:39,432 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-20 23:17:39,432 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-20 23:17:39,432 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2021-11-20 23:17:39,433 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2021-11-20 23:17:39,516 INFO L236 CfgBuilder]: Building ICFG [2021-11-20 23:17:39,519 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-20 23:17:39,738 INFO L277 CfgBuilder]: Performing block encoding [2021-11-20 23:17:39,790 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-20 23:17:39,791 INFO L301 CfgBuilder]: Removed 7 assume(true) statements. [2021-11-20 23:17:39,794 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.11 11:17:39 BoogieIcfgContainer [2021-11-20 23:17:39,794 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-20 23:17:39,796 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-20 23:17:39,797 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-20 23:17:39,812 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-20 23:17:39,812 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.11 11:17:38" (1/3) ... [2021-11-20 23:17:39,813 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@50fd3113 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.11 11:17:39, skipping insertion in model container [2021-11-20 23:17:39,813 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:17:39" (2/3) ... [2021-11-20 23:17:39,814 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@50fd3113 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.11 11:17:39, skipping insertion in model container [2021-11-20 23:17:39,814 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.11 11:17:39" (3/3) ... [2021-11-20 23:17:39,816 INFO L111 eAbstractionObserver]: Analyzing ICFG zero_sum_m3.c [2021-11-20 23:17:39,823 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-20 23:17:39,823 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-20 23:17:39,951 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-20 23:17:39,961 INFO L339 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mLoopAccelerationTechnique=FAST_UPR [2021-11-20 23:17:39,961 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-20 23:17:39,976 INFO L276 IsEmpty]: Start isEmpty. Operand has 15 states, 13 states have (on average 1.7692307692307692) internal successors, (23), 14 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:17:39,983 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2021-11-20 23:17:39,984 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:17:39,985 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:17:39,985 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:17:39,992 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:17:39,992 INFO L85 PathProgramCache]: Analyzing trace with hash 797261710, now seen corresponding path program 1 times [2021-11-20 23:17:40,005 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:17:40,005 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [900315328] [2021-11-20 23:17:40,006 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:17:40,007 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:17:40,126 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:17:40,286 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:17:40,287 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:17:40,288 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [900315328] [2021-11-20 23:17:40,288 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [900315328] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:17:40,289 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 23:17:40,290 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-20 23:17:40,297 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1928206115] [2021-11-20 23:17:40,298 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:17:40,304 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-20 23:17:40,305 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:17:40,340 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-20 23:17:40,341 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-20 23:17:40,343 INFO L87 Difference]: Start difference. First operand has 15 states, 13 states have (on average 1.7692307692307692) internal successors, (23), 14 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) Second operand has 3 states, 3 states have (on average 3.6666666666666665) internal successors, (11), 3 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:17:40,413 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:17:40,414 INFO L93 Difference]: Finished difference Result 28 states and 43 transitions. [2021-11-20 23:17:40,415 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-20 23:17:40,417 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 3.6666666666666665) internal successors, (11), 3 states have internal predecessors, (11), 0 states have call successors, (0), 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 11 [2021-11-20 23:17:40,418 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:17:40,427 INFO L225 Difference]: With dead ends: 28 [2021-11-20 23:17:40,427 INFO L226 Difference]: Without dead ends: 13 [2021-11-20 23:17:40,431 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-20 23:17:40,436 INFO L933 BasicCegarLoop]: 6 mSDtfsCounter, 0 mSDsluCounter, 5 mSDsCounter, 0 mSdLazyCounter, 33 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 10 SdHoareTripleChecker+Invalid, 33 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 33 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-20 23:17:40,438 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 10 Invalid, 33 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 33 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-20 23:17:40,460 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2021-11-20 23:17:40,475 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2021-11-20 23:17:40,477 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 13 states, 12 states have (on average 1.5833333333333333) internal successors, (19), 12 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:17:40,477 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 19 transitions. [2021-11-20 23:17:40,479 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 19 transitions. Word has length 11 [2021-11-20 23:17:40,479 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:17:40,480 INFO L470 AbstractCegarLoop]: Abstraction has 13 states and 19 transitions. [2021-11-20 23:17:40,480 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 3.6666666666666665) internal successors, (11), 3 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:17:40,480 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 19 transitions. [2021-11-20 23:17:40,481 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2021-11-20 23:17:40,481 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:17:40,481 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:17:40,482 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-20 23:17:40,482 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:17:40,483 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:17:40,483 INFO L85 PathProgramCache]: Analyzing trace with hash -800631237, now seen corresponding path program 1 times [2021-11-20 23:17:40,483 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:17:40,484 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1825934798] [2021-11-20 23:17:40,484 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:17:40,484 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:17:40,514 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:17:40,594 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-20 23:17:40,595 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:17:40,596 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1825934798] [2021-11-20 23:17:40,597 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1825934798] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:17:40,597 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 23:17:40,597 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-20 23:17:40,597 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [59304800] [2021-11-20 23:17:40,624 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:17:40,625 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-20 23:17:40,626 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:17:40,626 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-20 23:17:40,626 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-20 23:17:40,627 INFO L87 Difference]: Start difference. First operand 13 states and 19 transitions. Second operand has 4 states, 4 states have (on average 3.0) internal successors, (12), 4 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:17:40,729 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:17:40,729 INFO L93 Difference]: Finished difference Result 27 states and 43 transitions. [2021-11-20 23:17:40,731 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-20 23:17:40,731 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 3.0) internal successors, (12), 4 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 12 [2021-11-20 23:17:40,731 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:17:40,732 INFO L225 Difference]: With dead ends: 27 [2021-11-20 23:17:40,732 INFO L226 Difference]: Without dead ends: 19 [2021-11-20 23:17:40,733 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-20 23:17:40,735 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 15 mSDsluCounter, 2 mSDsCounter, 0 mSdLazyCounter, 25 mSolverCounterSat, 16 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 15 SdHoareTripleChecker+Valid, 5 SdHoareTripleChecker+Invalid, 41 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 16 IncrementalHoareTripleChecker+Valid, 25 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-20 23:17:40,736 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [15 Valid, 5 Invalid, 41 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [16 Valid, 25 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-20 23:17:40,737 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2021-11-20 23:17:40,742 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2021-11-20 23:17:40,743 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19 states, 18 states have (on average 1.3888888888888888) internal successors, (25), 18 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:17:40,744 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 25 transitions. [2021-11-20 23:17:40,749 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 25 transitions. Word has length 12 [2021-11-20 23:17:40,750 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:17:40,753 INFO L470 AbstractCegarLoop]: Abstraction has 19 states and 25 transitions. [2021-11-20 23:17:40,754 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 3.0) internal successors, (12), 4 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:17:40,754 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 25 transitions. [2021-11-20 23:17:40,755 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2021-11-20 23:17:40,761 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:17:40,761 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:17:40,762 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-11-20 23:17:40,762 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:17:40,763 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:17:40,763 INFO L85 PathProgramCache]: Analyzing trace with hash -801296507, now seen corresponding path program 1 times [2021-11-20 23:17:40,764 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:17:40,764 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1745969888] [2021-11-20 23:17:40,764 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:17:40,764 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:17:40,814 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:17:40,861 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-20 23:17:40,861 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:17:40,862 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1745969888] [2021-11-20 23:17:40,862 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1745969888] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:17:40,862 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [403488345] [2021-11-20 23:17:40,863 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:17:40,863 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:17:40,863 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73fd7ef1-177b-4e6a-8abd-c8718fa70b47/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:17:40,866 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73fd7ef1-177b-4e6a-8abd-c8718fa70b47/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:17:40,876 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73fd7ef1-177b-4e6a-8abd-c8718fa70b47/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-20 23:17:40,960 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:17:40,962 INFO L263 TraceCheckSpWp]: Trace formula consists of 102 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-20 23:17:40,969 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:17:41,106 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-20 23:17:41,107 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:17:41,229 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-20 23:17:41,230 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [403488345] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:17:41,230 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [855041813] [2021-11-20 23:17:41,258 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2021-11-20 23:17:41,258 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:17:41,264 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:17:41,271 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:17:41,271 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:17:41,451 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:17:41,508 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-20 23:17:41,510 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-20 23:17:41,588 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:17:41,596 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 32 [2021-11-20 23:17:41,793 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:17:41,798 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 39 treesize of output 41 [2021-11-20 23:17:42,060 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:17:42,068 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:17:42,071 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:17:42,089 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-20 23:17:42,090 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 240 treesize of output 228 [2021-11-20 23:17:42,509 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 21 [2021-11-20 23:17:43,956 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:17:44,151 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:17:44,151 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:17:44,151 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 7 [2021-11-20 23:17:44,152 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2141980500] [2021-11-20 23:17:44,152 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:17:44,152 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-20 23:17:44,153 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:17:44,153 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-20 23:17:44,154 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=33, Invalid=99, Unknown=0, NotChecked=0, Total=132 [2021-11-20 23:17:44,154 INFO L87 Difference]: Start difference. First operand 19 states and 25 transitions. Second operand has 7 states, 7 states have (on average 3.2857142857142856) internal successors, (23), 7 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:17:44,238 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:17:44,238 INFO L93 Difference]: Finished difference Result 35 states and 47 transitions. [2021-11-20 23:17:44,239 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-20 23:17:44,239 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 3.2857142857142856) internal successors, (23), 7 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 18 [2021-11-20 23:17:44,239 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:17:44,240 INFO L225 Difference]: With dead ends: 35 [2021-11-20 23:17:44,240 INFO L226 Difference]: Without dead ends: 20 [2021-11-20 23:17:44,241 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 45 SyntacticMatches, 1 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 37 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=33, Invalid=99, Unknown=0, NotChecked=0, Total=132 [2021-11-20 23:17:44,243 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 0 mSDsluCounter, 6 mSDsCounter, 0 mSdLazyCounter, 62 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 9 SdHoareTripleChecker+Invalid, 63 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 62 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-20 23:17:44,244 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 9 Invalid, 63 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 62 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-20 23:17:44,245 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2021-11-20 23:17:44,249 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2021-11-20 23:17:44,249 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20 states, 19 states have (on average 1.368421052631579) internal successors, (26), 19 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:17:44,250 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 26 transitions. [2021-11-20 23:17:44,250 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 26 transitions. Word has length 18 [2021-11-20 23:17:44,250 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:17:44,251 INFO L470 AbstractCegarLoop]: Abstraction has 20 states and 26 transitions. [2021-11-20 23:17:44,251 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 3.2857142857142856) internal successors, (23), 7 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:17:44,251 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 26 transitions. [2021-11-20 23:17:44,252 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2021-11-20 23:17:44,252 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:17:44,252 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:17:44,294 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73fd7ef1-177b-4e6a-8abd-c8718fa70b47/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-20 23:17:44,453 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73fd7ef1-177b-4e6a-8abd-c8718fa70b47/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:17:44,453 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:17:44,453 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:17:44,454 INFO L85 PathProgramCache]: Analyzing trace with hash -1102992328, now seen corresponding path program 2 times [2021-11-20 23:17:44,454 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:17:44,454 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1843844480] [2021-11-20 23:17:44,454 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:17:44,454 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:17:44,482 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:17:44,523 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-20 23:17:44,524 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:17:44,524 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1843844480] [2021-11-20 23:17:44,524 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1843844480] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:17:44,525 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1724986483] [2021-11-20 23:17:44,525 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-20 23:17:44,525 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:17:44,525 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73fd7ef1-177b-4e6a-8abd-c8718fa70b47/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:17:44,526 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73fd7ef1-177b-4e6a-8abd-c8718fa70b47/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:17:44,552 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73fd7ef1-177b-4e6a-8abd-c8718fa70b47/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-20 23:17:44,597 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-11-20 23:17:44,597 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:17:44,598 INFO L263 TraceCheckSpWp]: Trace formula consists of 108 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-20 23:17:44,601 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:17:44,673 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-20 23:17:44,673 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:17:44,732 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-20 23:17:44,733 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1724986483] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:17:44,734 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1796853603] [2021-11-20 23:17:44,739 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2021-11-20 23:17:44,739 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:17:44,740 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:17:44,740 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:17:44,740 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:17:44,835 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:17:44,837 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:17:44,871 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-20 23:17:44,873 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-20 23:17:44,916 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:17:44,922 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 6 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 32 [2021-11-20 23:17:45,026 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:17:45,028 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 34 treesize of output 36 [2021-11-20 23:17:45,136 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:17:45,137 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:17:45,164 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-20 23:17:45,164 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 230 treesize of output 229 [2021-11-20 23:17:45,751 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 21 [2021-11-20 23:17:46,976 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:17:47,177 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:17:47,177 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:17:47,177 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 8 [2021-11-20 23:17:47,178 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [970812948] [2021-11-20 23:17:47,178 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:17:47,178 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-20 23:17:47,178 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:17:47,179 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-20 23:17:47,179 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=118, Unknown=0, NotChecked=0, Total=156 [2021-11-20 23:17:47,180 INFO L87 Difference]: Start difference. First operand 20 states and 26 transitions. Second operand has 8 states, 8 states have (on average 2.875) internal successors, (23), 8 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:17:47,281 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:17:47,281 INFO L93 Difference]: Finished difference Result 39 states and 55 transitions. [2021-11-20 23:17:47,283 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-20 23:17:47,283 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 2.875) internal successors, (23), 8 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 19 [2021-11-20 23:17:47,283 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:17:47,284 INFO L225 Difference]: With dead ends: 39 [2021-11-20 23:17:47,284 INFO L226 Difference]: Without dead ends: 26 [2021-11-20 23:17:47,285 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 47 SyntacticMatches, 2 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 50 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=38, Invalid=118, Unknown=0, NotChecked=0, Total=156 [2021-11-20 23:17:47,286 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 10 mSDsluCounter, 8 mSDsCounter, 0 mSdLazyCounter, 55 mSolverCounterSat, 33 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 11 SdHoareTripleChecker+Invalid, 88 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 33 IncrementalHoareTripleChecker+Valid, 55 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-20 23:17:47,293 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [10 Valid, 11 Invalid, 88 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [33 Valid, 55 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-20 23:17:47,294 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2021-11-20 23:17:47,298 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2021-11-20 23:17:47,299 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 25 states have (on average 1.28) internal successors, (32), 25 states have internal predecessors, (32), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:17:47,300 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 32 transitions. [2021-11-20 23:17:47,300 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 32 transitions. Word has length 19 [2021-11-20 23:17:47,300 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:17:47,300 INFO L470 AbstractCegarLoop]: Abstraction has 26 states and 32 transitions. [2021-11-20 23:17:47,301 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 2.875) internal successors, (23), 8 states have internal predecessors, (23), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:17:47,301 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 32 transitions. [2021-11-20 23:17:47,302 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2021-11-20 23:17:47,302 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:17:47,302 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:17:47,337 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73fd7ef1-177b-4e6a-8abd-c8718fa70b47/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-20 23:17:47,512 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73fd7ef1-177b-4e6a-8abd-c8718fa70b47/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:17:47,512 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:17:47,513 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:17:47,513 INFO L85 PathProgramCache]: Analyzing trace with hash 196438190, now seen corresponding path program 3 times [2021-11-20 23:17:47,513 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:17:47,513 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [233308232] [2021-11-20 23:17:47,514 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:17:47,514 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:17:47,687 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:17:49,092 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:17:49,092 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:17:49,092 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [233308232] [2021-11-20 23:17:49,093 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [233308232] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:17:49,093 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2121590897] [2021-11-20 23:17:49,093 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-20 23:17:49,093 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:17:49,094 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73fd7ef1-177b-4e6a-8abd-c8718fa70b47/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:17:49,096 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73fd7ef1-177b-4e6a-8abd-c8718fa70b47/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:17:49,116 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73fd7ef1-177b-4e6a-8abd-c8718fa70b47/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-20 23:17:49,163 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-20 23:17:49,163 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:17:49,165 WARN L261 TraceCheckSpWp]: Trace formula consists of 101 conjuncts, 55 conjunts are in the unsatisfiable core [2021-11-20 23:17:49,168 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:17:49,945 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-20 23:17:49,945 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:17:50,981 INFO L354 Elim1Store]: treesize reduction 39, result has 52.4 percent of original size [2021-11-20 23:17:50,982 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 36 treesize of output 52 [2021-11-20 23:17:51,093 INFO L354 Elim1Store]: treesize reduction 73, result has 11.0 percent of original size [2021-11-20 23:17:51,094 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 35 treesize of output 17 [2021-11-20 23:17:51,166 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2021-11-20 23:17:51,166 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2121590897] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:17:51,167 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [172145198] [2021-11-20 23:17:51,169 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2021-11-20 23:17:51,169 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:17:51,170 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:17:51,170 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:17:51,170 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:17:51,233 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:17:51,260 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-20 23:17:51,261 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-20 23:17:51,320 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:17:51,322 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 6 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 32 [2021-11-20 23:17:51,375 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:17:51,377 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 39 treesize of output 41 [2021-11-20 23:17:51,520 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:17:51,522 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:17:51,525 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:17:51,540 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-20 23:17:51,540 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 240 treesize of output 228 [2021-11-20 23:17:51,865 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 21 [2021-11-20 23:17:52,715 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:17:52,986 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:17:52,986 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:17:52,986 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 18, 19] total 36 [2021-11-20 23:17:52,986 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1552067522] [2021-11-20 23:17:52,986 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:17:52,987 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 36 states [2021-11-20 23:17:52,987 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:17:52,988 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2021-11-20 23:17:52,989 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=114, Invalid=1526, Unknown=0, NotChecked=0, Total=1640 [2021-11-20 23:17:52,989 INFO L87 Difference]: Start difference. First operand 26 states and 32 transitions. Second operand has 36 states, 36 states have (on average 1.3611111111111112) internal successors, (49), 36 states have internal predecessors, (49), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:17:53,631 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:17:53,631 INFO L93 Difference]: Finished difference Result 45 states and 56 transitions. [2021-11-20 23:17:53,631 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-11-20 23:17:53,632 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 36 states have (on average 1.3611111111111112) internal successors, (49), 36 states have internal predecessors, (49), 0 states have call successors, (0), 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 25 [2021-11-20 23:17:53,632 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:17:53,633 INFO L225 Difference]: With dead ends: 45 [2021-11-20 23:17:53,633 INFO L226 Difference]: Without dead ends: 42 [2021-11-20 23:17:53,634 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 98 GetRequests, 40 SyntacticMatches, 18 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 467 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=120, Invalid=1602, Unknown=0, NotChecked=0, Total=1722 [2021-11-20 23:17:53,635 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 9 mSDsluCounter, 106 mSDsCounter, 0 mSdLazyCounter, 794 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 9 SdHoareTripleChecker+Valid, 57 SdHoareTripleChecker+Invalid, 799 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 794 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-20 23:17:53,636 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [9 Valid, 57 Invalid, 799 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 794 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2021-11-20 23:17:53,639 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2021-11-20 23:17:53,645 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 40. [2021-11-20 23:17:53,646 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40 states, 39 states have (on average 1.3076923076923077) internal successors, (51), 39 states have internal predecessors, (51), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:17:53,647 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 51 transitions. [2021-11-20 23:17:53,648 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 51 transitions. Word has length 25 [2021-11-20 23:17:53,648 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:17:53,648 INFO L470 AbstractCegarLoop]: Abstraction has 40 states and 51 transitions. [2021-11-20 23:17:53,649 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 36 states, 36 states have (on average 1.3611111111111112) internal successors, (49), 36 states have internal predecessors, (49), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:17:53,649 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 51 transitions. [2021-11-20 23:17:53,650 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2021-11-20 23:17:53,650 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:17:53,650 INFO L514 BasicCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:17:53,675 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73fd7ef1-177b-4e6a-8abd-c8718fa70b47/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Ended with exit code 0 [2021-11-20 23:17:53,850 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73fd7ef1-177b-4e6a-8abd-c8718fa70b47/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:17:53,851 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:17:53,852 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:17:53,852 INFO L85 PathProgramCache]: Analyzing trace with hash 261601827, now seen corresponding path program 4 times [2021-11-20 23:17:53,852 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:17:53,852 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1887562657] [2021-11-20 23:17:53,853 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:17:53,853 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:17:53,888 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:17:53,957 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 4 proven. 5 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-20 23:17:53,958 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:17:53,963 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1887562657] [2021-11-20 23:17:53,963 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1887562657] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:17:53,963 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1823782513] [2021-11-20 23:17:53,964 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-20 23:17:53,964 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:17:53,964 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73fd7ef1-177b-4e6a-8abd-c8718fa70b47/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:17:53,965 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73fd7ef1-177b-4e6a-8abd-c8718fa70b47/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:17:53,992 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73fd7ef1-177b-4e6a-8abd-c8718fa70b47/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-20 23:17:54,040 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:17:54,041 INFO L263 TraceCheckSpWp]: Trace formula consists of 143 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-20 23:17:54,043 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:17:54,146 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-20 23:17:54,146 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:17:54,222 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-20 23:17:54,223 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1823782513] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:17:54,223 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1199577728] [2021-11-20 23:17:54,226 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2021-11-20 23:17:54,226 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:17:54,227 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:17:54,227 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:17:54,227 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:17:54,291 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:17:54,321 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-20 23:17:54,321 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-20 23:17:54,356 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:17:54,358 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 32 [2021-11-20 23:17:54,477 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:17:54,479 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 34 treesize of output 36 [2021-11-20 23:17:54,564 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:17:54,565 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:17:54,587 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-20 23:17:54,587 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 230 treesize of output 229 [2021-11-20 23:17:55,163 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 21 [2021-11-20 23:17:56,316 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:17:56,488 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:17:56,488 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:17:56,488 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 13 [2021-11-20 23:17:56,488 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1070611852] [2021-11-20 23:17:56,488 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:17:56,489 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2021-11-20 23:17:56,489 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:17:56,490 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-11-20 23:17:56,490 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=62, Invalid=244, Unknown=0, NotChecked=0, Total=306 [2021-11-20 23:17:56,491 INFO L87 Difference]: Start difference. First operand 40 states and 51 transitions. Second operand has 13 states, 13 states have (on average 2.230769230769231) internal successors, (29), 13 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) [2021-11-20 23:17:56,680 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:17:56,680 INFO L93 Difference]: Finished difference Result 78 states and 100 transitions. [2021-11-20 23:17:56,681 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-20 23:17:56,681 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 2.230769230769231) internal successors, (29), 13 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 26 [2021-11-20 23:17:56,681 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:17:56,682 INFO L225 Difference]: With dead ends: 78 [2021-11-20 23:17:56,682 INFO L226 Difference]: Without dead ends: 41 [2021-11-20 23:17:56,683 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 87 GetRequests, 68 SyntacticMatches, 0 SemanticMatches, 19 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 96 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=85, Invalid=335, Unknown=0, NotChecked=0, Total=420 [2021-11-20 23:17:56,684 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 5 mSDsluCounter, 19 mSDsCounter, 0 mSdLazyCounter, 132 mSolverCounterSat, 75 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 9 SdHoareTripleChecker+Invalid, 207 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 75 IncrementalHoareTripleChecker+Valid, 132 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-20 23:17:56,685 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [5 Valid, 9 Invalid, 207 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [75 Valid, 132 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-20 23:17:56,686 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2021-11-20 23:17:56,692 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2021-11-20 23:17:56,693 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 41 states, 40 states have (on average 1.3) internal successors, (52), 40 states have internal predecessors, (52), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:17:56,694 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 52 transitions. [2021-11-20 23:17:56,694 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 52 transitions. Word has length 26 [2021-11-20 23:17:56,694 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:17:56,694 INFO L470 AbstractCegarLoop]: Abstraction has 41 states and 52 transitions. [2021-11-20 23:17:56,695 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 2.230769230769231) internal successors, (29), 13 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) [2021-11-20 23:17:56,695 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 52 transitions. [2021-11-20 23:17:56,696 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2021-11-20 23:17:56,696 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:17:56,696 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:17:56,746 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73fd7ef1-177b-4e6a-8abd-c8718fa70b47/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-20 23:17:56,912 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73fd7ef1-177b-4e6a-8abd-c8718fa70b47/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:17:56,912 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:17:56,913 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:17:56,913 INFO L85 PathProgramCache]: Analyzing trace with hash -1959144490, now seen corresponding path program 5 times [2021-11-20 23:17:56,913 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:17:56,913 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1597074061] [2021-11-20 23:17:56,913 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:17:56,913 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:17:56,936 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:17:57,041 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 1 proven. 8 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-11-20 23:17:57,041 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:17:57,042 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1597074061] [2021-11-20 23:17:57,042 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1597074061] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:17:57,042 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1443692000] [2021-11-20 23:17:57,042 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-20 23:17:57,043 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:17:57,043 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73fd7ef1-177b-4e6a-8abd-c8718fa70b47/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:17:57,044 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73fd7ef1-177b-4e6a-8abd-c8718fa70b47/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:17:57,068 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73fd7ef1-177b-4e6a-8abd-c8718fa70b47/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-20 23:17:57,120 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-11-20 23:17:57,120 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:17:57,122 INFO L263 TraceCheckSpWp]: Trace formula consists of 149 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-20 23:17:57,124 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:17:57,245 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-11-20 23:17:57,245 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:17:57,335 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-11-20 23:17:57,335 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1443692000] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:17:57,336 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2001842071] [2021-11-20 23:17:57,341 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2021-11-20 23:17:57,341 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:17:57,341 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:17:57,342 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:17:57,342 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:17:57,425 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:17:57,457 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-20 23:17:57,457 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-20 23:17:57,491 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:17:57,493 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 32 [2021-11-20 23:17:57,549 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:17:57,554 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 34 treesize of output 36 [2021-11-20 23:17:57,641 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:17:57,642 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:17:57,671 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-20 23:17:57,672 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 230 treesize of output 229 [2021-11-20 23:17:58,195 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 21 [2021-11-20 23:17:59,229 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:17:59,395 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:17:59,396 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:17:59,396 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 14 [2021-11-20 23:17:59,396 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [462159548] [2021-11-20 23:17:59,396 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:17:59,396 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2021-11-20 23:17:59,397 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:17:59,397 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-11-20 23:17:59,397 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=65, Invalid=277, Unknown=0, NotChecked=0, Total=342 [2021-11-20 23:17:59,397 INFO L87 Difference]: Start difference. First operand 41 states and 52 transitions. Second operand has 14 states, 14 states have (on average 2.0714285714285716) internal successors, (29), 14 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) [2021-11-20 23:17:59,523 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:17:59,523 INFO L93 Difference]: Finished difference Result 62 states and 82 transitions. [2021-11-20 23:17:59,523 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-20 23:17:59,524 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 2.0714285714285716) internal successors, (29), 14 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 27 [2021-11-20 23:17:59,524 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:17:59,524 INFO L225 Difference]: With dead ends: 62 [2021-11-20 23:17:59,524 INFO L226 Difference]: Without dead ends: 33 [2021-11-20 23:17:59,525 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 92 GetRequests, 69 SyntacticMatches, 2 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 126 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=108, Invalid=398, Unknown=0, NotChecked=0, Total=506 [2021-11-20 23:17:59,526 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 39 mSDsluCounter, 8 mSDsCounter, 0 mSdLazyCounter, 94 mSolverCounterSat, 85 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 39 SdHoareTripleChecker+Valid, 11 SdHoareTripleChecker+Invalid, 179 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 85 IncrementalHoareTripleChecker+Valid, 94 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-20 23:17:59,526 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [39 Valid, 11 Invalid, 179 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [85 Valid, 94 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-20 23:17:59,527 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 33 states. [2021-11-20 23:17:59,531 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 33 to 33. [2021-11-20 23:17:59,531 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 33 states, 32 states have (on average 1.21875) internal successors, (39), 32 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:17:59,532 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 39 transitions. [2021-11-20 23:17:59,532 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 39 transitions. Word has length 27 [2021-11-20 23:17:59,533 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:17:59,533 INFO L470 AbstractCegarLoop]: Abstraction has 33 states and 39 transitions. [2021-11-20 23:17:59,533 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 2.0714285714285716) internal successors, (29), 14 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) [2021-11-20 23:17:59,533 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 39 transitions. [2021-11-20 23:17:59,534 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2021-11-20 23:17:59,534 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:17:59,534 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:17:59,564 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73fd7ef1-177b-4e6a-8abd-c8718fa70b47/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-20 23:17:59,748 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73fd7ef1-177b-4e6a-8abd-c8718fa70b47/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:17:59,748 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:17:59,749 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:17:59,749 INFO L85 PathProgramCache]: Analyzing trace with hash 1855861477, now seen corresponding path program 6 times [2021-11-20 23:17:59,749 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:17:59,749 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1544777397] [2021-11-20 23:17:59,749 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:17:59,749 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:17:59,844 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:18:01,584 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:18:01,585 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:18:01,585 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1544777397] [2021-11-20 23:18:01,585 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1544777397] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:18:01,585 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1596500569] [2021-11-20 23:18:01,585 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-20 23:18:01,585 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:18:01,585 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73fd7ef1-177b-4e6a-8abd-c8718fa70b47/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:18:01,587 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73fd7ef1-177b-4e6a-8abd-c8718fa70b47/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:18:01,606 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73fd7ef1-177b-4e6a-8abd-c8718fa70b47/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-20 23:18:01,650 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-20 23:18:01,650 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:18:01,652 WARN L261 TraceCheckSpWp]: Trace formula consists of 131 conjuncts, 79 conjunts are in the unsatisfiable core [2021-11-20 23:18:01,654 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:18:03,296 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-20 23:18:03,296 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:18:05,460 INFO L354 Elim1Store]: treesize reduction 114, result has 46.0 percent of original size [2021-11-20 23:18:05,461 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 6 select indices, 6 select index equivalence classes, 0 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 15 case distinctions, treesize of input 53 treesize of output 108 [2021-11-20 23:18:05,874 INFO L354 Elim1Store]: treesize reduction 198, result has 6.2 percent of original size [2021-11-20 23:18:05,875 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 6 select indices, 6 select index equivalence classes, 0 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 15 case distinctions, treesize of input 52 treesize of output 23 [2021-11-20 23:18:05,992 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-20 23:18:05,993 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1596500569] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:18:05,993 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [161857910] [2021-11-20 23:18:05,995 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2021-11-20 23:18:05,995 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:18:05,996 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:18:05,996 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:18:05,996 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:18:06,053 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:18:06,076 INFO L354 Elim1Store]: treesize reduction 24, result has 44.2 percent of original size [2021-11-20 23:18:06,077 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 24 treesize of output 40 [2021-11-20 23:18:06,117 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:18:06,144 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-20 23:18:06,145 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-20 23:18:06,243 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:18:06,244 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 39 treesize of output 41 [2021-11-20 23:18:06,343 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:18:06,347 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:18:06,349 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:18:06,363 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-20 23:18:06,363 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 240 treesize of output 228 [2021-11-20 23:18:06,599 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 0 case distinctions, treesize of input 25 treesize of output 21 [2021-11-20 23:18:07,783 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:18:08,420 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:18:08,420 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:18:08,420 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 24, 25] total 65 [2021-11-20 23:18:08,421 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1990856726] [2021-11-20 23:18:08,421 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:18:08,422 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 65 states [2021-11-20 23:18:08,422 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:18:08,422 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 65 interpolants. [2021-11-20 23:18:08,425 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=220, Invalid=4610, Unknown=0, NotChecked=0, Total=4830 [2021-11-20 23:18:08,426 INFO L87 Difference]: Start difference. First operand 33 states and 39 transitions. Second operand has 65 states, 65 states have (on average 1.2461538461538462) internal successors, (81), 65 states have internal predecessors, (81), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:18:12,980 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:18:12,980 INFO L93 Difference]: Finished difference Result 87 states and 108 transitions. [2021-11-20 23:18:12,980 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2021-11-20 23:18:12,981 INFO L78 Accepts]: Start accepts. Automaton has has 65 states, 65 states have (on average 1.2461538461538462) internal successors, (81), 65 states have internal predecessors, (81), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 32 [2021-11-20 23:18:12,981 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:18:12,983 INFO L225 Difference]: With dead ends: 87 [2021-11-20 23:18:12,983 INFO L226 Difference]: Without dead ends: 84 [2021-11-20 23:18:12,986 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 152 GetRequests, 42 SyntacticMatches, 15 SemanticMatches, 95 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2305 ImplicationChecksByTransitivity, 7.8s TimeCoverageRelationStatistics Valid=486, Invalid=8826, Unknown=0, NotChecked=0, Total=9312 [2021-11-20 23:18:12,987 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 12 mSDsluCounter, 78 mSDsCounter, 0 mSdLazyCounter, 1635 mSolverCounterSat, 141 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 77 SdHoareTripleChecker+Invalid, 1776 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 141 IncrementalHoareTripleChecker+Valid, 1635 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.4s IncrementalHoareTripleChecker+Time [2021-11-20 23:18:12,987 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [12 Valid, 77 Invalid, 1776 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [141 Valid, 1635 Invalid, 0 Unknown, 0 Unchecked, 1.4s Time] [2021-11-20 23:18:12,988 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2021-11-20 23:18:13,000 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 57. [2021-11-20 23:18:13,000 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 57 states, 56 states have (on average 1.2678571428571428) internal successors, (71), 56 states have internal predecessors, (71), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:18:13,001 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 71 transitions. [2021-11-20 23:18:13,002 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 71 transitions. Word has length 32 [2021-11-20 23:18:13,002 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:18:13,002 INFO L470 AbstractCegarLoop]: Abstraction has 57 states and 71 transitions. [2021-11-20 23:18:13,003 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 65 states, 65 states have (on average 1.2461538461538462) internal successors, (81), 65 states have internal predecessors, (81), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:18:13,003 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 71 transitions. [2021-11-20 23:18:13,004 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2021-11-20 23:18:13,004 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:18:13,004 INFO L514 BasicCegarLoop]: trace histogram [4, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:18:13,030 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73fd7ef1-177b-4e6a-8abd-c8718fa70b47/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-20 23:18:13,205 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73fd7ef1-177b-4e6a-8abd-c8718fa70b47/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable7 [2021-11-20 23:18:13,208 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:18:13,209 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:18:13,209 INFO L85 PathProgramCache]: Analyzing trace with hash 268754161, now seen corresponding path program 7 times [2021-11-20 23:18:13,209 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:18:13,209 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [967621354] [2021-11-20 23:18:13,209 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:18:13,209 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:18:13,221 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:18:13,298 INFO L134 CoverageAnalysis]: Checked inductivity of 46 backedges. 7 proven. 9 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2021-11-20 23:18:13,298 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:18:13,298 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [967621354] [2021-11-20 23:18:13,298 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [967621354] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:18:13,299 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [689653307] [2021-11-20 23:18:13,299 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-20 23:18:13,299 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:18:13,299 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73fd7ef1-177b-4e6a-8abd-c8718fa70b47/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:18:13,300 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73fd7ef1-177b-4e6a-8abd-c8718fa70b47/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:18:13,320 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73fd7ef1-177b-4e6a-8abd-c8718fa70b47/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-20 23:18:13,355 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:18:13,356 INFO L263 TraceCheckSpWp]: Trace formula consists of 179 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-20 23:18:13,358 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:18:13,468 INFO L134 CoverageAnalysis]: Checked inductivity of 46 backedges. 10 proven. 6 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2021-11-20 23:18:13,468 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:18:13,567 INFO L134 CoverageAnalysis]: Checked inductivity of 46 backedges. 10 proven. 6 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2021-11-20 23:18:13,567 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [689653307] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:18:13,567 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [253704739] [2021-11-20 23:18:13,570 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2021-11-20 23:18:13,570 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:18:13,570 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:18:13,571 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:18:13,571 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:18:13,621 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:18:13,646 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-20 23:18:13,647 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-20 23:18:13,678 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:18:13,684 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 32 [2021-11-20 23:18:13,758 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:18:13,759 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 39 treesize of output 41 [2021-11-20 23:18:13,915 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:18:13,918 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:18:13,920 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:18:13,936 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-20 23:18:13,937 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 240 treesize of output 228 [2021-11-20 23:18:14,196 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 21 [2021-11-20 23:18:15,279 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:18:15,461 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:18:15,461 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:18:15,461 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 17 [2021-11-20 23:18:15,461 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2125955666] [2021-11-20 23:18:15,461 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:18:15,462 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2021-11-20 23:18:15,462 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:18:15,463 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2021-11-20 23:18:15,463 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=91, Invalid=371, Unknown=0, NotChecked=0, Total=462 [2021-11-20 23:18:15,464 INFO L87 Difference]: Start difference. First operand 57 states and 71 transitions. Second operand has 17 states, 17 states have (on average 1.8823529411764706) internal successors, (32), 17 states have internal predecessors, (32), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:18:15,675 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:18:15,675 INFO L93 Difference]: Finished difference Result 115 states and 142 transitions. [2021-11-20 23:18:15,675 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2021-11-20 23:18:15,676 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 1.8823529411764706) internal successors, (32), 17 states have internal predecessors, (32), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 33 [2021-11-20 23:18:15,676 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:18:15,676 INFO L225 Difference]: With dead ends: 115 [2021-11-20 23:18:15,677 INFO L226 Difference]: Without dead ends: 53 [2021-11-20 23:18:15,678 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 112 GetRequests, 88 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 162 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=131, Invalid=519, Unknown=0, NotChecked=0, Total=650 [2021-11-20 23:18:15,678 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 7 mSDsluCounter, 19 mSDsCounter, 0 mSdLazyCounter, 190 mSolverCounterSat, 75 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 9 SdHoareTripleChecker+Invalid, 265 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 75 IncrementalHoareTripleChecker+Valid, 190 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-20 23:18:15,679 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [7 Valid, 9 Invalid, 265 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [75 Valid, 190 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-20 23:18:15,681 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 53 states. [2021-11-20 23:18:15,692 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 53 to 53. [2021-11-20 23:18:15,693 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 53 states, 52 states have (on average 1.25) internal successors, (65), 52 states have internal predecessors, (65), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:18:15,694 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53 states to 53 states and 65 transitions. [2021-11-20 23:18:15,694 INFO L78 Accepts]: Start accepts. Automaton has 53 states and 65 transitions. Word has length 33 [2021-11-20 23:18:15,695 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:18:15,695 INFO L470 AbstractCegarLoop]: Abstraction has 53 states and 65 transitions. [2021-11-20 23:18:15,695 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 17 states have (on average 1.8823529411764706) internal successors, (32), 17 states have internal predecessors, (32), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:18:15,695 INFO L276 IsEmpty]: Start isEmpty. Operand 53 states and 65 transitions. [2021-11-20 23:18:15,697 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2021-11-20 23:18:15,697 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:18:15,697 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:18:15,725 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73fd7ef1-177b-4e6a-8abd-c8718fa70b47/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-11-20 23:18:15,904 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73fd7ef1-177b-4e6a-8abd-c8718fa70b47/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:18:15,905 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:18:15,905 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:18:15,905 INFO L85 PathProgramCache]: Analyzing trace with hash 972489694, now seen corresponding path program 8 times [2021-11-20 23:18:15,905 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:18:15,905 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [894783110] [2021-11-20 23:18:15,905 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:18:15,906 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:18:15,920 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:18:16,011 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 3 proven. 13 refuted. 0 times theorem prover too weak. 34 trivial. 0 not checked. [2021-11-20 23:18:16,012 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:18:16,012 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [894783110] [2021-11-20 23:18:16,012 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [894783110] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:18:16,013 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [237195620] [2021-11-20 23:18:16,013 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-20 23:18:16,013 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:18:16,013 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73fd7ef1-177b-4e6a-8abd-c8718fa70b47/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:18:16,020 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73fd7ef1-177b-4e6a-8abd-c8718fa70b47/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:18:16,039 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73fd7ef1-177b-4e6a-8abd-c8718fa70b47/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-11-20 23:18:16,111 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-11-20 23:18:16,111 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:18:16,113 INFO L263 TraceCheckSpWp]: Trace formula consists of 185 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-20 23:18:16,116 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:18:16,334 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 6 proven. 10 refuted. 0 times theorem prover too weak. 34 trivial. 0 not checked. [2021-11-20 23:18:16,334 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:18:16,426 INFO L134 CoverageAnalysis]: Checked inductivity of 50 backedges. 6 proven. 10 refuted. 0 times theorem prover too weak. 34 trivial. 0 not checked. [2021-11-20 23:18:16,427 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [237195620] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:18:16,427 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1969762367] [2021-11-20 23:18:16,429 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2021-11-20 23:18:16,429 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:18:16,430 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:18:16,430 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:18:16,430 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:18:16,489 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:18:16,522 INFO L354 Elim1Store]: treesize reduction 24, result has 44.2 percent of original size [2021-11-20 23:18:16,522 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 24 treesize of output 40 [2021-11-20 23:18:16,565 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:18:16,598 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-20 23:18:16,599 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-20 23:18:16,663 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:18:16,664 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 34 treesize of output 36 [2021-11-20 23:18:16,785 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:18:16,786 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:18:16,814 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-20 23:18:16,815 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 230 treesize of output 229 [2021-11-20 23:18:17,266 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 21 [2021-11-20 23:18:18,414 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:18:18,595 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:18:18,595 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:18:18,595 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 20 [2021-11-20 23:18:18,596 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [678271943] [2021-11-20 23:18:18,596 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:18:18,596 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2021-11-20 23:18:18,596 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:18:18,596 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-11-20 23:18:18,597 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=98, Invalid=502, Unknown=0, NotChecked=0, Total=600 [2021-11-20 23:18:18,599 INFO L87 Difference]: Start difference. First operand 53 states and 65 transitions. Second operand has 20 states, 20 states have (on average 2.2) internal successors, (44), 20 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:18:18,802 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:18:18,802 INFO L93 Difference]: Finished difference Result 82 states and 104 transitions. [2021-11-20 23:18:18,802 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-20 23:18:18,803 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 2.2) internal successors, (44), 20 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 34 [2021-11-20 23:18:18,803 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:18:18,803 INFO L225 Difference]: With dead ends: 82 [2021-11-20 23:18:18,803 INFO L226 Difference]: Without dead ends: 45 [2021-11-20 23:18:18,804 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 122 GetRequests, 91 SyntacticMatches, 2 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 247 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=175, Invalid=755, Unknown=0, NotChecked=0, Total=930 [2021-11-20 23:18:18,805 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 14 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 185 mSolverCounterSat, 199 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 7 SdHoareTripleChecker+Invalid, 384 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 199 IncrementalHoareTripleChecker+Valid, 185 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-20 23:18:18,805 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [14 Valid, 7 Invalid, 384 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [199 Valid, 185 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-20 23:18:18,806 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 45 states. [2021-11-20 23:18:18,813 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 45 to 40. [2021-11-20 23:18:18,813 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40 states, 39 states have (on average 1.1794871794871795) internal successors, (46), 39 states have internal predecessors, (46), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:18:18,814 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 46 transitions. [2021-11-20 23:18:18,814 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 46 transitions. Word has length 34 [2021-11-20 23:18:18,814 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:18:18,815 INFO L470 AbstractCegarLoop]: Abstraction has 40 states and 46 transitions. [2021-11-20 23:18:18,815 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 20 states have (on average 2.2) internal successors, (44), 20 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:18:18,815 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 46 transitions. [2021-11-20 23:18:18,816 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 40 [2021-11-20 23:18:18,816 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:18:18,816 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:18:18,839 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73fd7ef1-177b-4e6a-8abd-c8718fa70b47/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-11-20 23:18:19,024 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73fd7ef1-177b-4e6a-8abd-c8718fa70b47/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:18:19,024 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:18:19,025 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:18:19,025 INFO L85 PathProgramCache]: Analyzing trace with hash 2066954702, now seen corresponding path program 9 times [2021-11-20 23:18:19,025 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:18:19,025 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1429231298] [2021-11-20 23:18:19,025 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:18:19,025 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:18:19,186 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:18:21,511 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 0 proven. 70 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:18:21,512 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:18:21,512 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1429231298] [2021-11-20 23:18:21,512 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1429231298] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:18:21,512 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1554383429] [2021-11-20 23:18:21,512 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-20 23:18:21,512 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:18:21,512 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73fd7ef1-177b-4e6a-8abd-c8718fa70b47/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:18:21,513 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73fd7ef1-177b-4e6a-8abd-c8718fa70b47/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:18:21,515 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73fd7ef1-177b-4e6a-8abd-c8718fa70b47/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-11-20 23:18:21,602 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-20 23:18:21,602 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:18:21,605 WARN L261 TraceCheckSpWp]: Trace formula consists of 161 conjuncts, 103 conjunts are in the unsatisfiable core [2021-11-20 23:18:21,608 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:18:23,783 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 0 proven. 60 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-20 23:18:23,783 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:18:26,838 INFO L354 Elim1Store]: treesize reduction 227, result has 43.3 percent of original size [2021-11-20 23:18:26,838 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 8 select indices, 8 select index equivalence classes, 0 disjoint index pairs (out of 28 index pairs), introduced 8 new quantified variables, introduced 28 case distinctions, treesize of input 70 treesize of output 186 [2021-11-20 23:18:27,446 INFO L354 Elim1Store]: treesize reduction 383, result has 4.3 percent of original size [2021-11-20 23:18:27,446 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 8 select indices, 8 select index equivalence classes, 0 disjoint index pairs (out of 28 index pairs), introduced 8 new quantified variables, introduced 28 case distinctions, treesize of input 69 treesize of output 29 [2021-11-20 23:18:27,543 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 0 proven. 60 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-20 23:18:27,543 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1554383429] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:18:27,544 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1570603011] [2021-11-20 23:18:27,546 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2021-11-20 23:18:27,546 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:18:27,546 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:18:27,547 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:18:27,547 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:18:27,604 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:18:27,624 INFO L354 Elim1Store]: treesize reduction 24, result has 44.2 percent of original size [2021-11-20 23:18:27,624 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 24 treesize of output 40 [2021-11-20 23:18:27,656 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:18:27,657 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:18:27,680 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-20 23:18:27,681 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-20 23:18:27,733 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:18:27,734 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 34 treesize of output 36 [2021-11-20 23:18:27,850 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:18:27,851 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:18:27,875 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-20 23:18:27,875 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 230 treesize of output 229 [2021-11-20 23:18:28,335 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 21 [2021-11-20 23:18:29,117 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:18:29,657 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:18:29,657 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:18:29,657 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38, 30, 31] total 87 [2021-11-20 23:18:29,657 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [334925386] [2021-11-20 23:18:29,657 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:18:29,658 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 87 states [2021-11-20 23:18:29,658 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:18:29,659 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 87 interpolants. [2021-11-20 23:18:29,661 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=304, Invalid=8068, Unknown=0, NotChecked=0, Total=8372 [2021-11-20 23:18:29,662 INFO L87 Difference]: Start difference. First operand 40 states and 46 transitions. Second operand has 87 states, 87 states have (on average 1.1839080459770115) internal successors, (103), 87 states have internal predecessors, (103), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:18:36,593 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:18:36,593 INFO L93 Difference]: Finished difference Result 100 states and 119 transitions. [2021-11-20 23:18:36,594 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 54 states. [2021-11-20 23:18:36,594 INFO L78 Accepts]: Start accepts. Automaton has has 87 states, 87 states have (on average 1.1839080459770115) internal successors, (103), 87 states have internal predecessors, (103), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 39 [2021-11-20 23:18:36,595 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:18:36,596 INFO L225 Difference]: With dead ends: 100 [2021-11-20 23:18:36,596 INFO L226 Difference]: Without dead ends: 97 [2021-11-20 23:18:36,601 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 187 GetRequests, 51 SyntacticMatches, 12 SemanticMatches, 124 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3904 ImplicationChecksByTransitivity, 10.9s TimeCoverageRelationStatistics Valid=738, Invalid=15012, Unknown=0, NotChecked=0, Total=15750 [2021-11-20 23:18:36,601 INFO L933 BasicCegarLoop]: 5 mSDtfsCounter, 14 mSDsluCounter, 217 mSDsCounter, 0 mSdLazyCounter, 2809 mSolverCounterSat, 194 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 217 SdHoareTripleChecker+Invalid, 3003 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 194 IncrementalHoareTripleChecker+Valid, 2809 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.3s IncrementalHoareTripleChecker+Time [2021-11-20 23:18:36,602 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [14 Valid, 217 Invalid, 3003 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [194 Valid, 2809 Invalid, 0 Unknown, 0 Unchecked, 2.3s Time] [2021-11-20 23:18:36,602 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 97 states. [2021-11-20 23:18:36,618 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 97 to 57. [2021-11-20 23:18:36,619 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 57 states, 56 states have (on average 1.1964285714285714) internal successors, (67), 56 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:18:36,619 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 67 transitions. [2021-11-20 23:18:36,620 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 67 transitions. Word has length 39 [2021-11-20 23:18:36,620 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:18:36,620 INFO L470 AbstractCegarLoop]: Abstraction has 57 states and 67 transitions. [2021-11-20 23:18:36,621 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 87 states, 87 states have (on average 1.1839080459770115) internal successors, (103), 87 states have internal predecessors, (103), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:18:36,621 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 67 transitions. [2021-11-20 23:18:36,622 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2021-11-20 23:18:36,622 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:18:36,622 INFO L514 BasicCegarLoop]: trace histogram [5, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:18:36,657 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73fd7ef1-177b-4e6a-8abd-c8718fa70b47/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2021-11-20 23:18:36,836 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73fd7ef1-177b-4e6a-8abd-c8718fa70b47/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:18:36,836 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:18:36,836 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:18:36,837 INFO L85 PathProgramCache]: Analyzing trace with hash 379486144, now seen corresponding path program 10 times [2021-11-20 23:18:36,837 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:18:36,837 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [99480503] [2021-11-20 23:18:36,837 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:18:36,837 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:18:36,852 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:18:36,941 INFO L134 CoverageAnalysis]: Checked inductivity of 75 backedges. 11 proven. 14 refuted. 0 times theorem prover too weak. 50 trivial. 0 not checked. [2021-11-20 23:18:36,941 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:18:36,942 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [99480503] [2021-11-20 23:18:36,942 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [99480503] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:18:36,942 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1275432612] [2021-11-20 23:18:36,942 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-20 23:18:36,942 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:18:36,943 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73fd7ef1-177b-4e6a-8abd-c8718fa70b47/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:18:36,944 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73fd7ef1-177b-4e6a-8abd-c8718fa70b47/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:18:36,967 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73fd7ef1-177b-4e6a-8abd-c8718fa70b47/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-11-20 23:18:37,032 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:18:37,034 INFO L263 TraceCheckSpWp]: Trace formula consists of 215 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-20 23:18:37,036 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:18:37,186 INFO L134 CoverageAnalysis]: Checked inductivity of 75 backedges. 15 proven. 10 refuted. 0 times theorem prover too weak. 50 trivial. 0 not checked. [2021-11-20 23:18:37,186 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:18:37,289 INFO L134 CoverageAnalysis]: Checked inductivity of 75 backedges. 15 proven. 10 refuted. 0 times theorem prover too weak. 50 trivial. 0 not checked. [2021-11-20 23:18:37,289 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1275432612] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:18:37,289 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2029643605] [2021-11-20 23:18:37,291 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2021-11-20 23:18:37,292 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:18:37,292 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:18:37,292 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:18:37,292 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:18:37,337 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:18:37,359 INFO L354 Elim1Store]: treesize reduction 24, result has 44.2 percent of original size [2021-11-20 23:18:37,359 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 24 treesize of output 40 [2021-11-20 23:18:37,391 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:18:37,411 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-20 23:18:37,412 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-20 23:18:37,484 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:18:37,485 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 39 treesize of output 41 [2021-11-20 23:18:37,585 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:18:37,588 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:18:37,590 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:18:37,604 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-20 23:18:37,604 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 240 treesize of output 228 [2021-11-20 23:18:37,835 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 21 [2021-11-20 23:18:38,834 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:18:39,011 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:18:39,012 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:18:39,012 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 20 [2021-11-20 23:18:39,012 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [630839737] [2021-11-20 23:18:39,012 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:18:39,012 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2021-11-20 23:18:39,012 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:18:39,013 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-11-20 23:18:39,013 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=118, Invalid=482, Unknown=0, NotChecked=0, Total=600 [2021-11-20 23:18:39,014 INFO L87 Difference]: Start difference. First operand 57 states and 67 transitions. Second operand has 20 states, 20 states have (on average 1.75) internal successors, (35), 20 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:18:39,209 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:18:39,209 INFO L93 Difference]: Finished difference Result 134 states and 159 transitions. [2021-11-20 23:18:39,210 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-11-20 23:18:39,210 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 1.75) internal successors, (35), 20 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 40 [2021-11-20 23:18:39,210 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:18:39,211 INFO L225 Difference]: With dead ends: 134 [2021-11-20 23:18:39,211 INFO L226 Difference]: Without dead ends: 58 [2021-11-20 23:18:39,212 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 136 GetRequests, 108 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 218 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=175, Invalid=695, Unknown=0, NotChecked=0, Total=870 [2021-11-20 23:18:39,213 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 5 mSDsluCounter, 21 mSDsCounter, 0 mSdLazyCounter, 200 mSolverCounterSat, 102 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 11 SdHoareTripleChecker+Invalid, 302 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 102 IncrementalHoareTripleChecker+Valid, 200 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-20 23:18:39,213 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [5 Valid, 11 Invalid, 302 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [102 Valid, 200 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-20 23:18:39,214 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2021-11-20 23:18:39,230 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 58. [2021-11-20 23:18:39,230 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 58 states, 57 states have (on average 1.1929824561403508) internal successors, (68), 57 states have internal predecessors, (68), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:18:39,231 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 68 transitions. [2021-11-20 23:18:39,231 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 68 transitions. Word has length 40 [2021-11-20 23:18:39,231 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:18:39,232 INFO L470 AbstractCegarLoop]: Abstraction has 58 states and 68 transitions. [2021-11-20 23:18:39,232 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 20 states have (on average 1.75) internal successors, (35), 20 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:18:39,232 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 68 transitions. [2021-11-20 23:18:39,233 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 42 [2021-11-20 23:18:39,234 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:18:39,234 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:18:39,259 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73fd7ef1-177b-4e6a-8abd-c8718fa70b47/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2021-11-20 23:18:39,444 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73fd7ef1-177b-4e6a-8abd-c8718fa70b47/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2021-11-20 23:18:39,444 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:18:39,445 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:18:39,445 INFO L85 PathProgramCache]: Analyzing trace with hash -796122061, now seen corresponding path program 11 times [2021-11-20 23:18:39,445 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:18:39,445 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2120181311] [2021-11-20 23:18:39,445 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:18:39,445 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:18:39,458 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:18:39,558 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 6 proven. 19 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2021-11-20 23:18:39,558 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:18:39,559 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2120181311] [2021-11-20 23:18:39,559 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2120181311] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:18:39,560 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [470559276] [2021-11-20 23:18:39,560 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-20 23:18:39,560 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:18:39,560 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73fd7ef1-177b-4e6a-8abd-c8718fa70b47/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:18:39,561 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73fd7ef1-177b-4e6a-8abd-c8718fa70b47/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:18:39,588 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73fd7ef1-177b-4e6a-8abd-c8718fa70b47/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2021-11-20 23:18:39,661 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-11-20 23:18:39,662 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:18:39,664 INFO L263 TraceCheckSpWp]: Trace formula consists of 221 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-20 23:18:39,666 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:18:39,844 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 10 proven. 15 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2021-11-20 23:18:39,845 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:18:39,959 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 10 proven. 15 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2021-11-20 23:18:39,959 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [470559276] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:18:39,960 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [677354009] [2021-11-20 23:18:39,961 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2021-11-20 23:18:39,961 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:18:39,962 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:18:39,962 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:18:39,962 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:18:40,011 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:18:40,034 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-20 23:18:40,035 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-20 23:18:40,075 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:18:40,077 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 32 [2021-11-20 23:18:40,150 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:18:40,151 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 39 treesize of output 41 [2021-11-20 23:18:40,257 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:18:40,267 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:18:40,270 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:18:40,285 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-20 23:18:40,286 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 240 treesize of output 228 [2021-11-20 23:18:40,506 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 21 [2021-11-20 23:18:41,266 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:18:41,423 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:18:41,423 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:18:41,423 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 20 [2021-11-20 23:18:41,423 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2010527520] [2021-11-20 23:18:41,423 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:18:41,424 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2021-11-20 23:18:41,424 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:18:41,424 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-11-20 23:18:41,424 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=113, Invalid=487, Unknown=0, NotChecked=0, Total=600 [2021-11-20 23:18:41,425 INFO L87 Difference]: Start difference. First operand 58 states and 68 transitions. Second operand has 20 states, 20 states have (on average 2.45) internal successors, (49), 20 states have internal predecessors, (49), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:18:41,605 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:18:41,605 INFO L93 Difference]: Finished difference Result 92 states and 112 transitions. [2021-11-20 23:18:41,606 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-11-20 23:18:41,606 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 2.45) internal successors, (49), 20 states have internal predecessors, (49), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 41 [2021-11-20 23:18:41,606 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:18:41,607 INFO L225 Difference]: With dead ends: 92 [2021-11-20 23:18:41,607 INFO L226 Difference]: Without dead ends: 47 [2021-11-20 23:18:41,607 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 140 GetRequests, 109 SyntacticMatches, 2 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 266 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=207, Invalid=723, Unknown=0, NotChecked=0, Total=930 [2021-11-20 23:18:41,608 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 64 mSDsluCounter, 8 mSDsCounter, 0 mSdLazyCounter, 126 mSolverCounterSat, 180 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 64 SdHoareTripleChecker+Valid, 11 SdHoareTripleChecker+Invalid, 306 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 180 IncrementalHoareTripleChecker+Valid, 126 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-20 23:18:41,608 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [64 Valid, 11 Invalid, 306 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [180 Valid, 126 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-20 23:18:41,609 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2021-11-20 23:18:41,621 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 47. [2021-11-20 23:18:41,621 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 47 states, 46 states have (on average 1.1521739130434783) internal successors, (53), 46 states have internal predecessors, (53), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:18:41,622 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 53 transitions. [2021-11-20 23:18:41,623 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 53 transitions. Word has length 41 [2021-11-20 23:18:41,623 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:18:41,623 INFO L470 AbstractCegarLoop]: Abstraction has 47 states and 53 transitions. [2021-11-20 23:18:41,623 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 20 states have (on average 2.45) internal successors, (49), 20 states have internal predecessors, (49), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:18:41,624 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 53 transitions. [2021-11-20 23:18:41,625 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2021-11-20 23:18:41,625 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:18:41,625 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:18:41,648 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73fd7ef1-177b-4e6a-8abd-c8718fa70b47/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2021-11-20 23:18:41,828 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73fd7ef1-177b-4e6a-8abd-c8718fa70b47/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2021-11-20 23:18:41,828 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:18:41,829 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:18:41,829 INFO L85 PathProgramCache]: Analyzing trace with hash -1528902075, now seen corresponding path program 12 times [2021-11-20 23:18:41,829 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:18:41,829 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [751027855] [2021-11-20 23:18:41,829 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:18:41,829 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:18:41,945 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:18:44,465 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 3 proven. 102 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:18:44,465 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:18:44,465 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [751027855] [2021-11-20 23:18:44,465 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [751027855] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:18:44,466 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [367109588] [2021-11-20 23:18:44,466 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-20 23:18:44,466 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:18:44,466 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73fd7ef1-177b-4e6a-8abd-c8718fa70b47/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:18:44,467 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73fd7ef1-177b-4e6a-8abd-c8718fa70b47/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:18:44,468 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73fd7ef1-177b-4e6a-8abd-c8718fa70b47/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2021-11-20 23:18:44,537 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-20 23:18:44,537 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:18:44,540 WARN L261 TraceCheckSpWp]: Trace formula consists of 191 conjuncts, 127 conjunts are in the unsatisfiable core [2021-11-20 23:18:44,544 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:18:47,591 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 0 proven. 90 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-20 23:18:47,591 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:18:52,598 INFO L354 Elim1Store]: treesize reduction 378, result has 41.8 percent of original size [2021-11-20 23:18:52,598 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 10 select indices, 10 select index equivalence classes, 0 disjoint index pairs (out of 45 index pairs), introduced 10 new quantified variables, introduced 45 case distinctions, treesize of input 87 treesize of output 286 [2021-11-20 23:18:54,429 INFO L354 Elim1Store]: treesize reduction 628, result has 3.2 percent of original size [2021-11-20 23:18:54,429 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 10 select indices, 10 select index equivalence classes, 0 disjoint index pairs (out of 45 index pairs), introduced 10 new quantified variables, introduced 45 case distinctions, treesize of input 86 treesize of output 35 [2021-11-20 23:18:54,544 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 0 proven. 90 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-20 23:18:54,544 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [367109588] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:18:54,544 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2075904326] [2021-11-20 23:18:54,546 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2021-11-20 23:18:54,546 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:18:54,547 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:18:54,547 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:18:54,547 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:18:54,592 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:18:54,610 INFO L354 Elim1Store]: treesize reduction 24, result has 44.2 percent of original size [2021-11-20 23:18:54,611 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 24 treesize of output 40 [2021-11-20 23:18:54,629 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:18:54,649 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-20 23:18:54,650 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-20 23:18:54,719 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:18:54,719 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 39 treesize of output 41 [2021-11-20 23:18:54,812 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:18:54,816 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:18:54,818 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:18:54,831 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-20 23:18:54,832 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 240 treesize of output 228 [2021-11-20 23:18:55,073 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 21 [2021-11-20 23:18:55,835 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:18:56,487 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:18:56,487 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:18:56,487 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [45, 36, 37] total 104 [2021-11-20 23:18:56,488 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1570139666] [2021-11-20 23:18:56,488 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:18:56,488 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 104 states [2021-11-20 23:18:56,488 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:18:56,489 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 104 interpolants. [2021-11-20 23:18:56,493 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=356, Invalid=11416, Unknown=0, NotChecked=0, Total=11772 [2021-11-20 23:18:56,493 INFO L87 Difference]: Start difference. First operand 47 states and 53 transitions. Second operand has 104 states, 104 states have (on average 1.1538461538461537) internal successors, (120), 104 states have internal predecessors, (120), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:19:06,969 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:19:06,969 INFO L93 Difference]: Finished difference Result 117 states and 135 transitions. [2021-11-20 23:19:06,970 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 66 states. [2021-11-20 23:19:06,970 INFO L78 Accepts]: Start accepts. Automaton has has 104 states, 104 states have (on average 1.1538461538461537) internal successors, (120), 104 states have internal predecessors, (120), 0 states have call successors, (0), 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 46 [2021-11-20 23:19:06,970 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:19:06,971 INFO L225 Difference]: With dead ends: 117 [2021-11-20 23:19:06,971 INFO L226 Difference]: Without dead ends: 114 [2021-11-20 23:19:06,974 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 226 GetRequests, 62 SyntacticMatches, 12 SemanticMatches, 152 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5662 ImplicationChecksByTransitivity, 16.5s TimeCoverageRelationStatistics Valid=1056, Invalid=22506, Unknown=0, NotChecked=0, Total=23562 [2021-11-20 23:19:06,975 INFO L933 BasicCegarLoop]: 5 mSDtfsCounter, 15 mSDsluCounter, 290 mSDsCounter, 0 mSdLazyCounter, 4244 mSolverCounterSat, 256 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 15 SdHoareTripleChecker+Valid, 289 SdHoareTripleChecker+Invalid, 4500 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 256 IncrementalHoareTripleChecker+Valid, 4244 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.1s IncrementalHoareTripleChecker+Time [2021-11-20 23:19:06,975 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [15 Valid, 289 Invalid, 4500 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [256 Valid, 4244 Invalid, 0 Unknown, 0 Unchecked, 3.1s Time] [2021-11-20 23:19:06,976 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 114 states. [2021-11-20 23:19:06,999 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 114 to 67. [2021-11-20 23:19:07,000 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 67 states, 66 states have (on average 1.1666666666666667) internal successors, (77), 66 states have internal predecessors, (77), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:19:07,000 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 77 transitions. [2021-11-20 23:19:07,001 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 77 transitions. Word has length 46 [2021-11-20 23:19:07,001 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:19:07,001 INFO L470 AbstractCegarLoop]: Abstraction has 67 states and 77 transitions. [2021-11-20 23:19:07,001 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 104 states, 104 states have (on average 1.1538461538461537) internal successors, (120), 104 states have internal predecessors, (120), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:19:07,002 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 77 transitions. [2021-11-20 23:19:07,003 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2021-11-20 23:19:07,003 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:19:07,003 INFO L514 BasicCegarLoop]: trace histogram [6, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:19:07,041 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73fd7ef1-177b-4e6a-8abd-c8718fa70b47/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2021-11-20 23:19:07,224 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13,13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73fd7ef1-177b-4e6a-8abd-c8718fa70b47/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:19:07,224 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:19:07,225 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:19:07,225 INFO L85 PathProgramCache]: Analyzing trace with hash 1525914513, now seen corresponding path program 13 times [2021-11-20 23:19:07,225 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:19:07,225 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [202195303] [2021-11-20 23:19:07,225 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:19:07,225 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:19:07,242 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:19:07,345 INFO L134 CoverageAnalysis]: Checked inductivity of 111 backedges. 16 proven. 20 refuted. 0 times theorem prover too weak. 75 trivial. 0 not checked. [2021-11-20 23:19:07,345 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:19:07,345 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [202195303] [2021-11-20 23:19:07,345 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [202195303] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:19:07,346 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [493803510] [2021-11-20 23:19:07,346 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-20 23:19:07,346 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:19:07,346 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73fd7ef1-177b-4e6a-8abd-c8718fa70b47/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:19:07,347 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73fd7ef1-177b-4e6a-8abd-c8718fa70b47/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:19:07,382 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73fd7ef1-177b-4e6a-8abd-c8718fa70b47/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2021-11-20 23:19:07,428 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:19:07,429 INFO L263 TraceCheckSpWp]: Trace formula consists of 251 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-20 23:19:07,431 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:19:07,629 INFO L134 CoverageAnalysis]: Checked inductivity of 111 backedges. 21 proven. 15 refuted. 0 times theorem prover too weak. 75 trivial. 0 not checked. [2021-11-20 23:19:07,629 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:19:07,736 INFO L134 CoverageAnalysis]: Checked inductivity of 111 backedges. 21 proven. 15 refuted. 0 times theorem prover too weak. 75 trivial. 0 not checked. [2021-11-20 23:19:07,737 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [493803510] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:19:07,737 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1845482621] [2021-11-20 23:19:07,740 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2021-11-20 23:19:07,740 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:19:07,741 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:19:07,741 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:19:07,741 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:19:07,789 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:19:07,811 INFO L354 Elim1Store]: treesize reduction 24, result has 44.2 percent of original size [2021-11-20 23:19:07,811 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 24 treesize of output 40 [2021-11-20 23:19:07,841 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:19:07,865 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-20 23:19:07,865 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-20 23:19:07,959 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:19:07,960 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 39 treesize of output 41 [2021-11-20 23:19:08,044 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:19:08,050 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:19:08,053 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:19:08,063 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-20 23:19:08,064 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 240 treesize of output 228 [2021-11-20 23:19:08,230 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 21 [2021-11-20 23:19:08,921 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:19:09,078 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:19:09,079 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:19:09,079 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 23 [2021-11-20 23:19:09,079 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1268383614] [2021-11-20 23:19:09,079 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:19:09,080 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2021-11-20 23:19:09,080 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:19:09,080 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-11-20 23:19:09,080 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=149, Invalid=607, Unknown=0, NotChecked=0, Total=756 [2021-11-20 23:19:09,080 INFO L87 Difference]: Start difference. First operand 67 states and 77 transitions. Second operand has 23 states, 23 states have (on average 1.6521739130434783) internal successors, (38), 23 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:19:09,317 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:19:09,317 INFO L93 Difference]: Finished difference Result 158 states and 183 transitions. [2021-11-20 23:19:09,318 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-11-20 23:19:09,318 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 1.6521739130434783) internal successors, (38), 23 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 47 [2021-11-20 23:19:09,318 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:19:09,318 INFO L225 Difference]: With dead ends: 158 [2021-11-20 23:19:09,318 INFO L226 Difference]: Without dead ends: 68 [2021-11-20 23:19:09,319 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 160 GetRequests, 128 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 281 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=226, Invalid=896, Unknown=0, NotChecked=0, Total=1122 [2021-11-20 23:19:09,320 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 9 mSDsluCounter, 25 mSDsCounter, 0 mSdLazyCounter, 342 mSolverCounterSat, 83 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 9 SdHoareTripleChecker+Valid, 15 SdHoareTripleChecker+Invalid, 425 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 83 IncrementalHoareTripleChecker+Valid, 342 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-20 23:19:09,320 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [9 Valid, 15 Invalid, 425 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [83 Valid, 342 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-20 23:19:09,321 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2021-11-20 23:19:09,339 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 68. [2021-11-20 23:19:09,339 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 68 states, 67 states have (on average 1.164179104477612) internal successors, (78), 67 states have internal predecessors, (78), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:19:09,339 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 78 transitions. [2021-11-20 23:19:09,339 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 78 transitions. Word has length 47 [2021-11-20 23:19:09,340 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:19:09,340 INFO L470 AbstractCegarLoop]: Abstraction has 68 states and 78 transitions. [2021-11-20 23:19:09,340 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 23 states have (on average 1.6521739130434783) internal successors, (38), 23 states have internal predecessors, (38), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:19:09,340 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 78 transitions. [2021-11-20 23:19:09,340 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2021-11-20 23:19:09,341 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:19:09,341 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:19:09,363 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73fd7ef1-177b-4e6a-8abd-c8718fa70b47/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2021-11-20 23:19:09,544 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73fd7ef1-177b-4e6a-8abd-c8718fa70b47/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2021-11-20 23:19:09,544 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:19:09,544 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:19:09,545 INFO L85 PathProgramCache]: Analyzing trace with hash -145973314, now seen corresponding path program 14 times [2021-11-20 23:19:09,545 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:19:09,545 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [112627875] [2021-11-20 23:19:09,545 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:19:09,545 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:19:09,564 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:19:09,668 INFO L134 CoverageAnalysis]: Checked inductivity of 117 backedges. 10 proven. 26 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2021-11-20 23:19:09,668 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:19:09,669 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [112627875] [2021-11-20 23:19:09,669 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [112627875] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:19:09,669 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [207937675] [2021-11-20 23:19:09,669 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-20 23:19:09,669 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:19:09,669 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73fd7ef1-177b-4e6a-8abd-c8718fa70b47/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:19:09,670 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73fd7ef1-177b-4e6a-8abd-c8718fa70b47/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:19:09,702 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73fd7ef1-177b-4e6a-8abd-c8718fa70b47/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2021-11-20 23:19:09,771 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2021-11-20 23:19:09,771 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:19:09,773 INFO L263 TraceCheckSpWp]: Trace formula consists of 257 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-20 23:19:09,774 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:19:09,953 INFO L134 CoverageAnalysis]: Checked inductivity of 117 backedges. 15 proven. 21 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2021-11-20 23:19:09,954 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:19:10,066 INFO L134 CoverageAnalysis]: Checked inductivity of 117 backedges. 15 proven. 21 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2021-11-20 23:19:10,066 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [207937675] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:19:10,067 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [987837519] [2021-11-20 23:19:10,069 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2021-11-20 23:19:10,069 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:19:10,070 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:19:10,070 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:19:10,070 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:19:10,122 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:19:10,143 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-20 23:19:10,143 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-20 23:19:10,168 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:19:10,169 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 32 [2021-11-20 23:19:10,243 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:19:10,244 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 34 treesize of output 36 [2021-11-20 23:19:10,329 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:19:10,330 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:19:10,350 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-20 23:19:10,351 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 230 treesize of output 229 [2021-11-20 23:19:10,680 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 21 [2021-11-20 23:19:11,445 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:19:11,596 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:19:11,596 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:19:11,596 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 23 [2021-11-20 23:19:11,597 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [680415550] [2021-11-20 23:19:11,597 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:19:11,597 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2021-11-20 23:19:11,597 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:19:11,598 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2021-11-20 23:19:11,598 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=143, Invalid=613, Unknown=0, NotChecked=0, Total=756 [2021-11-20 23:19:11,598 INFO L87 Difference]: Start difference. First operand 68 states and 78 transitions. Second operand has 23 states, 23 states have (on average 1.9565217391304348) internal successors, (45), 23 states have internal predecessors, (45), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:19:11,859 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:19:11,860 INFO L93 Difference]: Finished difference Result 107 states and 127 transitions. [2021-11-20 23:19:11,860 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2021-11-20 23:19:11,860 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 1.9565217391304348) internal successors, (45), 23 states have internal predecessors, (45), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 48 [2021-11-20 23:19:11,860 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:19:11,861 INFO L225 Difference]: With dead ends: 107 [2021-11-20 23:19:11,861 INFO L226 Difference]: Without dead ends: 54 [2021-11-20 23:19:11,862 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 164 GetRequests, 129 SyntacticMatches, 2 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 351 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=270, Invalid=920, Unknown=0, NotChecked=0, Total=1190 [2021-11-20 23:19:11,862 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 38 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 171 mSolverCounterSat, 161 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 38 SdHoareTripleChecker+Valid, 15 SdHoareTripleChecker+Invalid, 332 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 161 IncrementalHoareTripleChecker+Valid, 171 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-20 23:19:11,863 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [38 Valid, 15 Invalid, 332 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [161 Valid, 171 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-20 23:19:11,863 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2021-11-20 23:19:11,884 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 54. [2021-11-20 23:19:11,884 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 54 states, 53 states have (on average 1.1320754716981132) internal successors, (60), 53 states have internal predecessors, (60), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:19:11,884 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54 states to 54 states and 60 transitions. [2021-11-20 23:19:11,884 INFO L78 Accepts]: Start accepts. Automaton has 54 states and 60 transitions. Word has length 48 [2021-11-20 23:19:11,885 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:19:11,885 INFO L470 AbstractCegarLoop]: Abstraction has 54 states and 60 transitions. [2021-11-20 23:19:11,885 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 23 states have (on average 1.9565217391304348) internal successors, (45), 23 states have internal predecessors, (45), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:19:11,885 INFO L276 IsEmpty]: Start isEmpty. Operand 54 states and 60 transitions. [2021-11-20 23:19:11,886 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2021-11-20 23:19:11,886 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:19:11,886 INFO L514 BasicCegarLoop]: trace histogram [6, 6, 6, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:19:11,914 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73fd7ef1-177b-4e6a-8abd-c8718fa70b47/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2021-11-20 23:19:12,088 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73fd7ef1-177b-4e6a-8abd-c8718fa70b47/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2021-11-20 23:19:12,088 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:19:12,089 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:19:12,089 INFO L85 PathProgramCache]: Analyzing trace with hash 2929390, now seen corresponding path program 15 times [2021-11-20 23:19:12,089 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:19:12,089 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [316443408] [2021-11-20 23:19:12,089 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:19:12,089 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:19:12,269 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:19:16,697 INFO L134 CoverageAnalysis]: Checked inductivity of 147 backedges. 1 proven. 146 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:19:16,698 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:19:16,698 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [316443408] [2021-11-20 23:19:16,698 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [316443408] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:19:16,698 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1732184036] [2021-11-20 23:19:16,698 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-20 23:19:16,698 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:19:16,699 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73fd7ef1-177b-4e6a-8abd-c8718fa70b47/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:19:16,699 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73fd7ef1-177b-4e6a-8abd-c8718fa70b47/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:19:16,701 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73fd7ef1-177b-4e6a-8abd-c8718fa70b47/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2021-11-20 23:19:16,840 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-20 23:19:16,840 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:19:16,844 WARN L261 TraceCheckSpWp]: Trace formula consists of 221 conjuncts, 151 conjunts are in the unsatisfiable core [2021-11-20 23:19:16,846 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:19:22,126 INFO L134 CoverageAnalysis]: Checked inductivity of 147 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-11-20 23:19:22,127 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:19:30,462 INFO L354 Elim1Store]: treesize reduction 567, result has 40.8 percent of original size [2021-11-20 23:19:30,463 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 12 select indices, 12 select index equivalence classes, 0 disjoint index pairs (out of 66 index pairs), introduced 12 new quantified variables, introduced 66 case distinctions, treesize of input 104 treesize of output 408 [2021-11-20 23:19:34,295 INFO L354 Elim1Store]: treesize reduction 933, result has 2.6 percent of original size [2021-11-20 23:19:34,296 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 12 select indices, 12 select index equivalence classes, 0 disjoint index pairs (out of 66 index pairs), introduced 12 new quantified variables, introduced 66 case distinctions, treesize of input 103 treesize of output 41 [2021-11-20 23:19:34,479 INFO L134 CoverageAnalysis]: Checked inductivity of 147 backedges. 0 proven. 126 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-11-20 23:19:34,479 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1732184036] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:19:34,479 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1728732029] [2021-11-20 23:19:34,481 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2021-11-20 23:19:34,481 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:19:34,482 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:19:34,482 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:19:34,482 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:19:34,541 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:19:34,565 INFO L354 Elim1Store]: treesize reduction 24, result has 44.2 percent of original size [2021-11-20 23:19:34,566 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 24 treesize of output 40 [2021-11-20 23:19:34,621 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:19:34,653 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-20 23:19:34,653 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-20 23:19:34,749 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:19:34,750 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 34 treesize of output 36 [2021-11-20 23:19:34,877 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:19:34,878 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:19:34,906 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-20 23:19:34,906 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 230 treesize of output 229 [2021-11-20 23:19:35,304 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 21 [2021-11-20 23:19:36,227 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:19:37,253 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:19:37,254 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:19:37,254 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [52, 42, 43] total 124 [2021-11-20 23:19:37,254 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1185010878] [2021-11-20 23:19:37,254 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:19:37,255 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 124 states [2021-11-20 23:19:37,255 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:19:37,256 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 124 interpolants. [2021-11-20 23:19:37,257 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=424, Invalid=16088, Unknown=0, NotChecked=0, Total=16512 [2021-11-20 23:19:37,258 INFO L87 Difference]: Start difference. First operand 54 states and 60 transitions. Second operand has 124 states, 124 states have (on average 1.1290322580645162) internal successors, (140), 124 states have internal predecessors, (140), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:19:46,462 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:19:46,462 INFO L93 Difference]: Finished difference Result 93 states and 104 transitions. [2021-11-20 23:19:46,462 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2021-11-20 23:19:46,462 INFO L78 Accepts]: Start accepts. Automaton has has 124 states, 124 states have (on average 1.1290322580645162) internal successors, (140), 124 states have internal predecessors, (140), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 53 [2021-11-20 23:19:46,462 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:19:46,463 INFO L225 Difference]: With dead ends: 93 [2021-11-20 23:19:46,463 INFO L226 Difference]: Without dead ends: 90 [2021-11-20 23:19:46,465 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 244 GetRequests, 71 SyntacticMatches, 11 SemanticMatches, 162 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5953 ImplicationChecksByTransitivity, 21.8s TimeCoverageRelationStatistics Valid=813, Invalid=25919, Unknown=0, NotChecked=0, Total=26732 [2021-11-20 23:19:46,465 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 19 mSDsluCounter, 155 mSDsCounter, 0 mSdLazyCounter, 4135 mSolverCounterSat, 104 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 19 SdHoareTripleChecker+Valid, 145 SdHoareTripleChecker+Invalid, 4239 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 104 IncrementalHoareTripleChecker+Valid, 4135 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.2s IncrementalHoareTripleChecker+Time [2021-11-20 23:19:46,466 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [19 Valid, 145 Invalid, 4239 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [104 Valid, 4135 Invalid, 0 Unknown, 0 Unchecked, 3.2s Time] [2021-11-20 23:19:46,466 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2021-11-20 23:19:46,501 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 84. [2021-11-20 23:19:46,502 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 84 states, 83 states have (on average 1.144578313253012) internal successors, (95), 83 states have internal predecessors, (95), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:19:46,502 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 84 states to 84 states and 95 transitions. [2021-11-20 23:19:46,503 INFO L78 Accepts]: Start accepts. Automaton has 84 states and 95 transitions. Word has length 53 [2021-11-20 23:19:46,503 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:19:46,503 INFO L470 AbstractCegarLoop]: Abstraction has 84 states and 95 transitions. [2021-11-20 23:19:46,503 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 124 states, 124 states have (on average 1.1290322580645162) internal successors, (140), 124 states have internal predecessors, (140), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:19:46,504 INFO L276 IsEmpty]: Start isEmpty. Operand 84 states and 95 transitions. [2021-11-20 23:19:46,504 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2021-11-20 23:19:46,504 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:19:46,505 INFO L514 BasicCegarLoop]: trace histogram [7, 6, 6, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:19:46,532 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73fd7ef1-177b-4e6a-8abd-c8718fa70b47/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2021-11-20 23:19:46,724 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73fd7ef1-177b-4e6a-8abd-c8718fa70b47/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2021-11-20 23:19:46,724 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:19:46,724 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:19:46,725 INFO L85 PathProgramCache]: Analyzing trace with hash -514525469, now seen corresponding path program 16 times [2021-11-20 23:19:46,725 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:19:46,725 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [127824390] [2021-11-20 23:19:46,725 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:19:46,725 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:19:46,740 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:19:46,849 INFO L134 CoverageAnalysis]: Checked inductivity of 154 backedges. 22 proven. 27 refuted. 0 times theorem prover too weak. 105 trivial. 0 not checked. [2021-11-20 23:19:46,850 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:19:46,850 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [127824390] [2021-11-20 23:19:46,850 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [127824390] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:19:46,850 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [569725536] [2021-11-20 23:19:46,850 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-20 23:19:46,851 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:19:46,851 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73fd7ef1-177b-4e6a-8abd-c8718fa70b47/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:19:46,852 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73fd7ef1-177b-4e6a-8abd-c8718fa70b47/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:19:46,871 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73fd7ef1-177b-4e6a-8abd-c8718fa70b47/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2021-11-20 23:19:46,927 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:19:46,929 INFO L263 TraceCheckSpWp]: Trace formula consists of 287 conjuncts, 16 conjunts are in the unsatisfiable core [2021-11-20 23:19:46,930 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:19:47,143 INFO L134 CoverageAnalysis]: Checked inductivity of 154 backedges. 28 proven. 21 refuted. 0 times theorem prover too weak. 105 trivial. 0 not checked. [2021-11-20 23:19:47,143 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:19:47,237 INFO L134 CoverageAnalysis]: Checked inductivity of 154 backedges. 28 proven. 21 refuted. 0 times theorem prover too weak. 105 trivial. 0 not checked. [2021-11-20 23:19:47,237 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [569725536] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:19:47,237 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1256987004] [2021-11-20 23:19:47,239 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2021-11-20 23:19:47,239 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:19:47,239 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:19:47,239 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:19:47,239 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:19:47,281 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:19:47,301 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-20 23:19:47,302 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-20 23:19:47,329 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:19:47,330 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 32 [2021-11-20 23:19:47,368 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:19:47,369 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 39 treesize of output 41 [2021-11-20 23:19:47,455 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:19:47,458 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:19:47,460 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:19:47,472 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-20 23:19:47,472 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 240 treesize of output 228 [2021-11-20 23:19:47,654 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 21 [2021-11-20 23:19:48,375 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:19:48,541 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:19:48,541 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:19:48,541 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 16] total 25 [2021-11-20 23:19:48,541 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [358047526] [2021-11-20 23:19:48,541 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:19:48,542 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2021-11-20 23:19:48,542 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:19:48,542 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2021-11-20 23:19:48,542 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=174, Invalid=696, Unknown=0, NotChecked=0, Total=870 [2021-11-20 23:19:48,542 INFO L87 Difference]: Start difference. First operand 84 states and 95 transitions. Second operand has 25 states, 25 states have (on average 1.64) internal successors, (41), 25 states have internal predecessors, (41), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:19:48,817 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:19:48,818 INFO L93 Difference]: Finished difference Result 166 states and 188 transitions. [2021-11-20 23:19:48,818 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-11-20 23:19:48,818 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 1.64) internal successors, (41), 25 states have internal predecessors, (41), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 54 [2021-11-20 23:19:48,818 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:19:48,818 INFO L225 Difference]: With dead ends: 166 [2021-11-20 23:19:48,819 INFO L226 Difference]: Without dead ends: 85 [2021-11-20 23:19:48,819 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 183 GetRequests, 148 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 326 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=267, Invalid=1065, Unknown=0, NotChecked=0, Total=1332 [2021-11-20 23:19:48,819 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 11 mSDsluCounter, 30 mSDsCounter, 0 mSdLazyCounter, 379 mSolverCounterSat, 100 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 17 SdHoareTripleChecker+Invalid, 479 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 100 IncrementalHoareTripleChecker+Valid, 379 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-20 23:19:48,820 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [11 Valid, 17 Invalid, 479 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [100 Valid, 379 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-20 23:19:48,820 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 85 states. [2021-11-20 23:19:48,844 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 85 to 85. [2021-11-20 23:19:48,845 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 85 states, 84 states have (on average 1.1428571428571428) internal successors, (96), 84 states have internal predecessors, (96), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:19:48,845 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 96 transitions. [2021-11-20 23:19:48,845 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 96 transitions. Word has length 54 [2021-11-20 23:19:48,845 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:19:48,845 INFO L470 AbstractCegarLoop]: Abstraction has 85 states and 96 transitions. [2021-11-20 23:19:48,845 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 25 states have (on average 1.64) internal successors, (41), 25 states have internal predecessors, (41), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:19:48,845 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 96 transitions. [2021-11-20 23:19:48,846 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2021-11-20 23:19:48,846 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:19:48,846 INFO L514 BasicCegarLoop]: trace histogram [7, 7, 6, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:19:48,866 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73fd7ef1-177b-4e6a-8abd-c8718fa70b47/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2021-11-20 23:19:49,046 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73fd7ef1-177b-4e6a-8abd-c8718fa70b47/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2021-11-20 23:19:49,046 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:19:49,047 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:19:49,047 INFO L85 PathProgramCache]: Analyzing trace with hash 639915542, now seen corresponding path program 17 times [2021-11-20 23:19:49,047 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:19:49,047 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [976701374] [2021-11-20 23:19:49,047 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:19:49,047 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:19:49,065 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:19:49,191 INFO L134 CoverageAnalysis]: Checked inductivity of 161 backedges. 15 proven. 34 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2021-11-20 23:19:49,191 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:19:49,191 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [976701374] [2021-11-20 23:19:49,191 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [976701374] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:19:49,192 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [458282964] [2021-11-20 23:19:49,192 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-20 23:19:49,192 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:19:49,192 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73fd7ef1-177b-4e6a-8abd-c8718fa70b47/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:19:49,193 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73fd7ef1-177b-4e6a-8abd-c8718fa70b47/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:19:49,204 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73fd7ef1-177b-4e6a-8abd-c8718fa70b47/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2021-11-20 23:19:49,299 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2021-11-20 23:19:49,299 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:19:49,301 INFO L263 TraceCheckSpWp]: Trace formula consists of 293 conjuncts, 16 conjunts are in the unsatisfiable core [2021-11-20 23:19:49,303 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:19:49,509 INFO L134 CoverageAnalysis]: Checked inductivity of 161 backedges. 21 proven. 28 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2021-11-20 23:19:49,509 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:19:49,648 INFO L134 CoverageAnalysis]: Checked inductivity of 161 backedges. 21 proven. 28 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2021-11-20 23:19:49,648 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [458282964] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:19:49,648 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [968807944] [2021-11-20 23:19:49,649 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2021-11-20 23:19:49,649 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:19:49,650 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:19:49,650 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:19:49,650 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:19:49,690 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:19:49,717 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-20 23:19:49,717 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-20 23:19:49,738 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:19:49,739 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 32 [2021-11-20 23:19:49,811 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:19:49,812 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 39 treesize of output 41 [2021-11-20 23:19:49,892 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:19:49,894 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:19:49,896 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:19:49,907 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-20 23:19:49,907 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 240 treesize of output 228 [2021-11-20 23:19:50,086 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 21 [2021-11-20 23:19:50,768 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:19:50,918 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:19:50,918 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:19:50,919 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17] total 26 [2021-11-20 23:19:50,919 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1376954949] [2021-11-20 23:19:50,919 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:19:50,919 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2021-11-20 23:19:50,919 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:19:50,920 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-11-20 23:19:50,920 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=177, Invalid=753, Unknown=0, NotChecked=0, Total=930 [2021-11-20 23:19:50,920 INFO L87 Difference]: Start difference. First operand 85 states and 96 transitions. Second operand has 26 states, 26 states have (on average 1.9615384615384615) internal successors, (51), 26 states have internal predecessors, (51), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:19:51,191 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:19:51,191 INFO L93 Difference]: Finished difference Result 122 states and 142 transitions. [2021-11-20 23:19:51,191 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-11-20 23:19:51,191 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 1.9615384615384615) internal successors, (51), 26 states have internal predecessors, (51), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 55 [2021-11-20 23:19:51,192 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:19:51,192 INFO L225 Difference]: With dead ends: 122 [2021-11-20 23:19:51,192 INFO L226 Difference]: Without dead ends: 61 [2021-11-20 23:19:51,192 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 188 GetRequests, 149 SyntacticMatches, 2 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 446 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=342, Invalid=1140, Unknown=0, NotChecked=0, Total=1482 [2021-11-20 23:19:51,193 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 66 mSDsluCounter, 6 mSDsCounter, 0 mSdLazyCounter, 135 mSolverCounterSat, 321 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 66 SdHoareTripleChecker+Valid, 9 SdHoareTripleChecker+Invalid, 456 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 321 IncrementalHoareTripleChecker+Valid, 135 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-20 23:19:51,193 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [66 Valid, 9 Invalid, 456 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [321 Valid, 135 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-20 23:19:51,193 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61 states. [2021-11-20 23:19:51,208 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61 to 61. [2021-11-20 23:19:51,208 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 61 states, 60 states have (on average 1.1166666666666667) internal successors, (67), 60 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:19:51,208 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 67 transitions. [2021-11-20 23:19:51,208 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 67 transitions. Word has length 55 [2021-11-20 23:19:51,208 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:19:51,208 INFO L470 AbstractCegarLoop]: Abstraction has 61 states and 67 transitions. [2021-11-20 23:19:51,209 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 26 states have (on average 1.9615384615384615) internal successors, (51), 26 states have internal predecessors, (51), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:19:51,209 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 67 transitions. [2021-11-20 23:19:51,209 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2021-11-20 23:19:51,209 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:19:51,210 INFO L514 BasicCegarLoop]: trace histogram [7, 7, 7, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:19:51,232 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73fd7ef1-177b-4e6a-8abd-c8718fa70b47/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Forceful destruction successful, exit code 0 [2021-11-20 23:19:51,413 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73fd7ef1-177b-4e6a-8abd-c8718fa70b47/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:19:51,414 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:19:51,414 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:19:51,414 INFO L85 PathProgramCache]: Analyzing trace with hash 1609630117, now seen corresponding path program 18 times [2021-11-20 23:19:51,414 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:19:51,414 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2134725461] [2021-11-20 23:19:51,414 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:19:51,415 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:19:51,631 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:19:56,253 INFO L134 CoverageAnalysis]: Checked inductivity of 196 backedges. 0 proven. 196 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:19:56,253 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:19:56,254 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2134725461] [2021-11-20 23:19:56,254 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2134725461] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:19:56,254 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [174217069] [2021-11-20 23:19:56,254 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-20 23:19:56,254 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:19:56,254 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73fd7ef1-177b-4e6a-8abd-c8718fa70b47/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:19:56,255 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73fd7ef1-177b-4e6a-8abd-c8718fa70b47/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:19:56,256 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73fd7ef1-177b-4e6a-8abd-c8718fa70b47/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2021-11-20 23:19:56,358 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-20 23:19:56,358 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:19:56,362 WARN L261 TraceCheckSpWp]: Trace formula consists of 251 conjuncts, 175 conjunts are in the unsatisfiable core [2021-11-20 23:19:56,364 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:20:00,589 INFO L354 Elim1Store]: treesize reduction 7, result has 30.0 percent of original size [2021-11-20 23:20:00,589 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 37 treesize of output 20 [2021-11-20 23:20:00,800 INFO L134 CoverageAnalysis]: Checked inductivity of 196 backedges. 0 proven. 168 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-11-20 23:20:00,801 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:20:12,229 INFO L354 Elim1Store]: treesize reduction 794, result has 40.2 percent of original size [2021-11-20 23:20:12,230 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 14 select indices, 14 select index equivalence classes, 0 disjoint index pairs (out of 91 index pairs), introduced 14 new quantified variables, introduced 91 case distinctions, treesize of input 120 treesize of output 551 [2021-11-20 23:20:16,565 INFO L354 Elim1Store]: treesize reduction 1298, result has 2.2 percent of original size [2021-11-20 23:20:16,566 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 14 select indices, 14 select index equivalence classes, 0 disjoint index pairs (out of 91 index pairs), introduced 14 new quantified variables, introduced 91 case distinctions, treesize of input 121 treesize of output 48 [2021-11-20 23:20:16,751 INFO L134 CoverageAnalysis]: Checked inductivity of 196 backedges. 0 proven. 168 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-11-20 23:20:16,751 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [174217069] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:20:16,751 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [420254680] [2021-11-20 23:20:16,753 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2021-11-20 23:20:16,753 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:20:16,754 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:20:16,754 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:20:16,754 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:20:16,834 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:20:16,864 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-20 23:20:16,865 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-20 23:20:16,899 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:20:16,900 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 6 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 32 [2021-11-20 23:20:17,003 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:20:17,003 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 39 treesize of output 41 [2021-11-20 23:20:17,053 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:20:17,055 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:20:17,057 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:20:17,069 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-20 23:20:17,070 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 240 treesize of output 228 [2021-11-20 23:20:17,335 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 21 [2021-11-20 23:20:18,218 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:20:19,250 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:20:19,251 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:20:19,251 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [59, 48, 49] total 129 [2021-11-20 23:20:19,251 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1940385301] [2021-11-20 23:20:19,251 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:20:19,251 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 129 states [2021-11-20 23:20:19,252 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:20:19,252 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 129 interpolants. [2021-11-20 23:20:19,253 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=485, Invalid=17337, Unknown=0, NotChecked=0, Total=17822 [2021-11-20 23:20:19,253 INFO L87 Difference]: Start difference. First operand 61 states and 67 transitions. Second operand has 129 states, 129 states have (on average 1.124031007751938) internal successors, (145), 129 states have internal predecessors, (145), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:20:34,014 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:20:34,014 INFO L93 Difference]: Finished difference Result 105 states and 116 transitions. [2021-11-20 23:20:34,014 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 55 states. [2021-11-20 23:20:34,015 INFO L78 Accepts]: Start accepts. Automaton has has 129 states, 129 states have (on average 1.124031007751938) internal successors, (145), 129 states have internal predecessors, (145), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 60 [2021-11-20 23:20:34,015 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:20:34,015 INFO L225 Difference]: With dead ends: 105 [2021-11-20 23:20:34,016 INFO L226 Difference]: Without dead ends: 102 [2021-11-20 23:20:34,017 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 276 GetRequests, 87 SyntacticMatches, 18 SemanticMatches, 171 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6386 ImplicationChecksByTransitivity, 26.9s TimeCoverageRelationStatistics Valid=944, Invalid=28812, Unknown=0, NotChecked=0, Total=29756 [2021-11-20 23:20:34,017 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 13 mSDsluCounter, 186 mSDsCounter, 0 mSdLazyCounter, 5671 mSolverCounterSat, 114 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 13 SdHoareTripleChecker+Valid, 173 SdHoareTripleChecker+Invalid, 5785 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 114 IncrementalHoareTripleChecker+Valid, 5671 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 5.4s IncrementalHoareTripleChecker+Time [2021-11-20 23:20:34,017 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [13 Valid, 173 Invalid, 5785 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [114 Valid, 5671 Invalid, 0 Unknown, 0 Unchecked, 5.4s Time] [2021-11-20 23:20:34,018 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 102 states. [2021-11-20 23:20:34,046 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 102 to 95. [2021-11-20 23:20:34,046 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 95 states, 94 states have (on average 1.127659574468085) internal successors, (106), 94 states have internal predecessors, (106), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:20:34,046 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 95 states to 95 states and 106 transitions. [2021-11-20 23:20:34,047 INFO L78 Accepts]: Start accepts. Automaton has 95 states and 106 transitions. Word has length 60 [2021-11-20 23:20:34,047 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:20:34,047 INFO L470 AbstractCegarLoop]: Abstraction has 95 states and 106 transitions. [2021-11-20 23:20:34,047 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 129 states, 129 states have (on average 1.124031007751938) internal successors, (145), 129 states have internal predecessors, (145), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:20:34,047 INFO L276 IsEmpty]: Start isEmpty. Operand 95 states and 106 transitions. [2021-11-20 23:20:34,047 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2021-11-20 23:20:34,047 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:20:34,048 INFO L514 BasicCegarLoop]: trace histogram [8, 7, 7, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:20:34,068 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73fd7ef1-177b-4e6a-8abd-c8718fa70b47/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Forceful destruction successful, exit code 0 [2021-11-20 23:20:34,248 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73fd7ef1-177b-4e6a-8abd-c8718fa70b47/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:20:34,248 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:20:34,249 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:20:34,249 INFO L85 PathProgramCache]: Analyzing trace with hash -195002848, now seen corresponding path program 19 times [2021-11-20 23:20:34,249 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:20:34,249 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1553441468] [2021-11-20 23:20:34,249 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:20:34,249 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:20:34,270 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:20:34,406 INFO L134 CoverageAnalysis]: Checked inductivity of 204 backedges. 29 proven. 35 refuted. 0 times theorem prover too weak. 140 trivial. 0 not checked. [2021-11-20 23:20:34,406 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:20:34,406 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1553441468] [2021-11-20 23:20:34,406 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1553441468] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:20:34,407 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1045115106] [2021-11-20 23:20:34,407 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-20 23:20:34,407 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:20:34,407 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73fd7ef1-177b-4e6a-8abd-c8718fa70b47/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:20:34,412 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73fd7ef1-177b-4e6a-8abd-c8718fa70b47/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:20:34,448 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73fd7ef1-177b-4e6a-8abd-c8718fa70b47/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2021-11-20 23:20:34,513 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:20:34,515 INFO L263 TraceCheckSpWp]: Trace formula consists of 323 conjuncts, 18 conjunts are in the unsatisfiable core [2021-11-20 23:20:34,517 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:20:34,819 INFO L134 CoverageAnalysis]: Checked inductivity of 204 backedges. 36 proven. 28 refuted. 0 times theorem prover too weak. 140 trivial. 0 not checked. [2021-11-20 23:20:34,819 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:20:34,972 INFO L134 CoverageAnalysis]: Checked inductivity of 204 backedges. 36 proven. 28 refuted. 0 times theorem prover too weak. 140 trivial. 0 not checked. [2021-11-20 23:20:34,973 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1045115106] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:20:34,973 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1980188273] [2021-11-20 23:20:34,975 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2021-11-20 23:20:34,975 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:20:34,975 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:20:34,975 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:20:34,975 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:20:35,031 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:20:35,059 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-20 23:20:35,059 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-20 23:20:35,093 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:20:35,094 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 32 [2021-11-20 23:20:35,195 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:20:35,196 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 34 treesize of output 36 [2021-11-20 23:20:35,297 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:20:35,297 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:20:35,318 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-20 23:20:35,319 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 230 treesize of output 229 [2021-11-20 23:20:35,734 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 21 [2021-11-20 23:20:36,604 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:20:36,817 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:20:36,817 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:20:36,818 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 18] total 28 [2021-11-20 23:20:36,818 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1641171087] [2021-11-20 23:20:36,818 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:20:36,818 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2021-11-20 23:20:36,818 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:20:36,819 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2021-11-20 23:20:36,819 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=212, Invalid=844, Unknown=0, NotChecked=0, Total=1056 [2021-11-20 23:20:36,819 INFO L87 Difference]: Start difference. First operand 95 states and 106 transitions. Second operand has 28 states, 28 states have (on average 1.5714285714285714) internal successors, (44), 28 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:20:37,205 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:20:37,205 INFO L93 Difference]: Finished difference Result 188 states and 210 transitions. [2021-11-20 23:20:37,206 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-11-20 23:20:37,206 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 28 states have (on average 1.5714285714285714) internal successors, (44), 28 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 61 [2021-11-20 23:20:37,206 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:20:37,207 INFO L225 Difference]: With dead ends: 188 [2021-11-20 23:20:37,207 INFO L226 Difference]: Without dead ends: 96 [2021-11-20 23:20:37,208 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 207 GetRequests, 168 SyntacticMatches, 0 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 401 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=330, Invalid=1310, Unknown=0, NotChecked=0, Total=1640 [2021-11-20 23:20:37,209 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 7 mSDsluCounter, 33 mSDsCounter, 0 mSdLazyCounter, 391 mSolverCounterSat, 116 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 21 SdHoareTripleChecker+Invalid, 507 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 116 IncrementalHoareTripleChecker+Valid, 391 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-20 23:20:37,209 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [7 Valid, 21 Invalid, 507 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [116 Valid, 391 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-20 23:20:37,210 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2021-11-20 23:20:37,246 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 96. [2021-11-20 23:20:37,246 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 96 states, 95 states have (on average 1.1263157894736842) internal successors, (107), 95 states have internal predecessors, (107), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:20:37,247 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 96 states to 96 states and 107 transitions. [2021-11-20 23:20:37,247 INFO L78 Accepts]: Start accepts. Automaton has 96 states and 107 transitions. Word has length 61 [2021-11-20 23:20:37,247 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:20:37,247 INFO L470 AbstractCegarLoop]: Abstraction has 96 states and 107 transitions. [2021-11-20 23:20:37,247 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 28 states, 28 states have (on average 1.5714285714285714) internal successors, (44), 28 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:20:37,248 INFO L276 IsEmpty]: Start isEmpty. Operand 96 states and 107 transitions. [2021-11-20 23:20:37,248 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2021-11-20 23:20:37,248 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:20:37,248 INFO L514 BasicCegarLoop]: trace histogram [8, 8, 7, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:20:37,273 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73fd7ef1-177b-4e6a-8abd-c8718fa70b47/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Forceful destruction successful, exit code 0 [2021-11-20 23:20:37,449 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20,20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73fd7ef1-177b-4e6a-8abd-c8718fa70b47/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:20:37,449 INFO L402 AbstractCegarLoop]: === Iteration 22 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:20:37,449 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:20:37,449 INFO L85 PathProgramCache]: Analyzing trace with hash -1170985075, now seen corresponding path program 20 times [2021-11-20 23:20:37,449 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:20:37,450 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [984698408] [2021-11-20 23:20:37,450 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:20:37,450 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:20:37,475 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:20:37,675 INFO L134 CoverageAnalysis]: Checked inductivity of 212 backedges. 21 proven. 43 refuted. 0 times theorem prover too weak. 148 trivial. 0 not checked. [2021-11-20 23:20:37,675 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:20:37,676 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [984698408] [2021-11-20 23:20:37,676 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [984698408] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:20:37,676 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1678394379] [2021-11-20 23:20:37,676 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-20 23:20:37,676 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:20:37,676 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73fd7ef1-177b-4e6a-8abd-c8718fa70b47/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:20:37,680 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73fd7ef1-177b-4e6a-8abd-c8718fa70b47/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:20:37,708 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73fd7ef1-177b-4e6a-8abd-c8718fa70b47/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2021-11-20 23:20:37,840 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2021-11-20 23:20:37,841 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:20:37,844 INFO L263 TraceCheckSpWp]: Trace formula consists of 329 conjuncts, 18 conjunts are in the unsatisfiable core [2021-11-20 23:20:37,846 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:20:38,196 INFO L134 CoverageAnalysis]: Checked inductivity of 212 backedges. 28 proven. 36 refuted. 0 times theorem prover too weak. 148 trivial. 0 not checked. [2021-11-20 23:20:38,196 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:20:38,348 INFO L134 CoverageAnalysis]: Checked inductivity of 212 backedges. 28 proven. 36 refuted. 0 times theorem prover too weak. 148 trivial. 0 not checked. [2021-11-20 23:20:38,349 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1678394379] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:20:38,349 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1544459992] [2021-11-20 23:20:38,351 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2021-11-20 23:20:38,351 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:20:38,351 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:20:38,352 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:20:38,352 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:20:38,422 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:20:38,444 INFO L354 Elim1Store]: treesize reduction 24, result has 44.2 percent of original size [2021-11-20 23:20:38,444 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 24 treesize of output 40 [2021-11-20 23:20:38,468 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:20:38,498 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-20 23:20:38,498 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-20 23:20:38,570 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:20:38,571 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 34 treesize of output 36 [2021-11-20 23:20:38,670 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:20:38,671 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:20:38,693 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-20 23:20:38,693 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 230 treesize of output 229 [2021-11-20 23:20:39,133 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 21 [2021-11-20 23:20:40,141 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:20:40,388 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:20:40,388 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:20:40,388 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19] total 29 [2021-11-20 23:20:40,389 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [284486244] [2021-11-20 23:20:40,389 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:20:40,389 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2021-11-20 23:20:40,389 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:20:40,389 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2021-11-20 23:20:40,390 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=215, Invalid=907, Unknown=0, NotChecked=0, Total=1122 [2021-11-20 23:20:40,390 INFO L87 Difference]: Start difference. First operand 96 states and 107 transitions. Second operand has 29 states, 29 states have (on average 1.5172413793103448) internal successors, (44), 29 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:20:40,729 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:20:40,730 INFO L93 Difference]: Finished difference Result 137 states and 157 transitions. [2021-11-20 23:20:40,732 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2021-11-20 23:20:40,733 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 29 states have (on average 1.5172413793103448) internal successors, (44), 29 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 62 [2021-11-20 23:20:40,733 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:20:40,733 INFO L225 Difference]: With dead ends: 137 [2021-11-20 23:20:40,733 INFO L226 Difference]: Without dead ends: 68 [2021-11-20 23:20:40,734 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 212 GetRequests, 169 SyntacticMatches, 2 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 551 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=423, Invalid=1383, Unknown=0, NotChecked=0, Total=1806 [2021-11-20 23:20:40,735 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 23 mSDsluCounter, 6 mSDsCounter, 0 mSdLazyCounter, 157 mSolverCounterSat, 275 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 23 SdHoareTripleChecker+Valid, 9 SdHoareTripleChecker+Invalid, 432 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 275 IncrementalHoareTripleChecker+Valid, 157 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-20 23:20:40,735 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [23 Valid, 9 Invalid, 432 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [275 Valid, 157 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-20 23:20:40,736 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 68 states. [2021-11-20 23:20:40,759 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 68 to 68. [2021-11-20 23:20:40,759 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 68 states, 67 states have (on average 1.1044776119402986) internal successors, (74), 67 states have internal predecessors, (74), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:20:40,760 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 68 states to 68 states and 74 transitions. [2021-11-20 23:20:40,760 INFO L78 Accepts]: Start accepts. Automaton has 68 states and 74 transitions. Word has length 62 [2021-11-20 23:20:40,760 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:20:40,761 INFO L470 AbstractCegarLoop]: Abstraction has 68 states and 74 transitions. [2021-11-20 23:20:40,761 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 29 states have (on average 1.5172413793103448) internal successors, (44), 29 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:20:40,761 INFO L276 IsEmpty]: Start isEmpty. Operand 68 states and 74 transitions. [2021-11-20 23:20:40,762 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2021-11-20 23:20:40,762 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:20:40,762 INFO L514 BasicCegarLoop]: trace histogram [8, 8, 8, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:20:40,793 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73fd7ef1-177b-4e6a-8abd-c8718fa70b47/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Forceful destruction successful, exit code 0 [2021-11-20 23:20:40,973 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21,21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73fd7ef1-177b-4e6a-8abd-c8718fa70b47/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:20:40,973 INFO L402 AbstractCegarLoop]: === Iteration 23 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:20:40,974 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:20:40,974 INFO L85 PathProgramCache]: Analyzing trace with hash 961532942, now seen corresponding path program 21 times [2021-11-20 23:20:40,974 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:20:40,975 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [14031043] [2021-11-20 23:20:40,975 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:20:40,975 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:20:41,406 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:20:48,403 INFO L134 CoverageAnalysis]: Checked inductivity of 252 backedges. 22 proven. 230 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:20:48,403 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:20:48,403 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [14031043] [2021-11-20 23:20:48,403 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [14031043] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:20:48,404 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1326707740] [2021-11-20 23:20:48,404 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-20 23:20:48,404 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:20:48,404 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73fd7ef1-177b-4e6a-8abd-c8718fa70b47/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:20:48,405 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73fd7ef1-177b-4e6a-8abd-c8718fa70b47/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:20:48,406 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73fd7ef1-177b-4e6a-8abd-c8718fa70b47/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2021-11-20 23:20:48,541 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-20 23:20:48,541 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:20:48,546 WARN L261 TraceCheckSpWp]: Trace formula consists of 281 conjuncts, 199 conjunts are in the unsatisfiable core [2021-11-20 23:20:48,549 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:20:54,972 INFO L354 Elim1Store]: treesize reduction 7, result has 30.0 percent of original size [2021-11-20 23:20:54,972 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 39 treesize of output 22 [2021-11-20 23:20:55,213 INFO L134 CoverageAnalysis]: Checked inductivity of 252 backedges. 0 proven. 216 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-11-20 23:20:55,214 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:21:11,219 INFO L354 Elim1Store]: treesize reduction 1059, result has 39.7 percent of original size [2021-11-20 23:21:11,220 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 16 new quantified variables, introduced 120 case distinctions, treesize of input 138 treesize of output 718 [2021-11-20 23:21:27,891 INFO L354 Elim1Store]: treesize reduction 1723, result has 1.9 percent of original size [2021-11-20 23:21:27,891 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 16 new quantified variables, introduced 120 case distinctions, treesize of input 137 treesize of output 53 [2021-11-20 23:21:28,136 INFO L134 CoverageAnalysis]: Checked inductivity of 252 backedges. 0 proven. 216 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2021-11-20 23:21:28,136 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1326707740] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:21:28,137 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [586609089] [2021-11-20 23:21:28,138 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2021-11-20 23:21:28,138 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:21:28,139 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:21:28,139 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:21:28,139 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:21:28,201 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:21:28,232 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-20 23:21:28,233 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-20 23:21:28,276 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:21:28,277 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 6 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 32 [2021-11-20 23:21:28,354 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:21:28,355 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 39 treesize of output 41 [2021-11-20 23:21:28,462 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:21:28,464 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:21:28,466 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:21:28,478 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-20 23:21:28,479 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 240 treesize of output 228 [2021-11-20 23:21:28,707 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 21 [2021-11-20 23:21:29,617 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:21:30,859 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:21:30,859 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:21:30,860 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [66, 54, 55] total 145 [2021-11-20 23:21:30,860 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [190290238] [2021-11-20 23:21:30,860 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:21:30,861 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 145 states [2021-11-20 23:21:30,861 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:21:30,862 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 145 interpolants. [2021-11-20 23:21:30,863 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=514, Invalid=21836, Unknown=0, NotChecked=0, Total=22350 [2021-11-20 23:21:30,863 INFO L87 Difference]: Start difference. First operand 68 states and 74 transitions. Second operand has 145 states, 145 states have (on average 1.110344827586207) internal successors, (161), 145 states have internal predecessors, (161), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:21:56,540 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:21:56,540 INFO L93 Difference]: Finished difference Result 171 states and 189 transitions. [2021-11-20 23:21:56,540 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 94 states. [2021-11-20 23:21:56,541 INFO L78 Accepts]: Start accepts. Automaton has has 145 states, 145 states have (on average 1.110344827586207) internal successors, (161), 145 states have internal predecessors, (161), 0 states have call successors, (0), 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 67 [2021-11-20 23:21:56,541 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:21:56,542 INFO L225 Difference]: With dead ends: 171 [2021-11-20 23:21:56,542 INFO L226 Difference]: Without dead ends: 168 [2021-11-20 23:21:56,545 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 325 GetRequests, 96 SyntacticMatches, 21 SemanticMatches, 208 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10166 ImplicationChecksByTransitivity, 42.5s TimeCoverageRelationStatistics Valid=1596, Invalid=42294, Unknown=0, NotChecked=0, Total=43890 [2021-11-20 23:21:56,546 INFO L933 BasicCegarLoop]: 5 mSDtfsCounter, 17 mSDsluCounter, 346 mSDsCounter, 0 mSdLazyCounter, 6966 mSolverCounterSat, 386 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 6.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 17 SdHoareTripleChecker+Valid, 347 SdHoareTripleChecker+Invalid, 7352 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 386 IncrementalHoareTripleChecker+Valid, 6966 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 7.5s IncrementalHoareTripleChecker+Time [2021-11-20 23:21:56,546 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [17 Valid, 347 Invalid, 7352 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [386 Valid, 6966 Invalid, 0 Unknown, 0 Unchecked, 7.5s Time] [2021-11-20 23:21:56,547 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 168 states. [2021-11-20 23:21:56,595 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 168 to 97. [2021-11-20 23:21:56,595 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 97 states, 96 states have (on average 1.1145833333333333) internal successors, (107), 96 states have internal predecessors, (107), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:21:56,596 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 97 states to 97 states and 107 transitions. [2021-11-20 23:21:56,596 INFO L78 Accepts]: Start accepts. Automaton has 97 states and 107 transitions. Word has length 67 [2021-11-20 23:21:56,596 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:21:56,596 INFO L470 AbstractCegarLoop]: Abstraction has 97 states and 107 transitions. [2021-11-20 23:21:56,596 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 145 states, 145 states have (on average 1.110344827586207) internal successors, (161), 145 states have internal predecessors, (161), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:21:56,597 INFO L276 IsEmpty]: Start isEmpty. Operand 97 states and 107 transitions. [2021-11-20 23:21:56,597 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2021-11-20 23:21:56,597 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:21:56,597 INFO L514 BasicCegarLoop]: trace histogram [9, 8, 8, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:21:56,626 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73fd7ef1-177b-4e6a-8abd-c8718fa70b47/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Forceful destruction successful, exit code 0 [2021-11-20 23:21:56,798 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73fd7ef1-177b-4e6a-8abd-c8718fa70b47/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable22 [2021-11-20 23:21:56,798 INFO L402 AbstractCegarLoop]: === Iteration 24 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:21:56,799 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:21:56,799 INFO L85 PathProgramCache]: Analyzing trace with hash -286447744, now seen corresponding path program 22 times [2021-11-20 23:21:56,799 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:21:56,799 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1666277142] [2021-11-20 23:21:56,800 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:21:56,800 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:21:56,829 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:21:57,041 INFO L134 CoverageAnalysis]: Checked inductivity of 261 backedges. 37 proven. 44 refuted. 0 times theorem prover too weak. 180 trivial. 0 not checked. [2021-11-20 23:21:57,041 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:21:57,041 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1666277142] [2021-11-20 23:21:57,041 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1666277142] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:21:57,041 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [940374350] [2021-11-20 23:21:57,041 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-20 23:21:57,041 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:21:57,042 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73fd7ef1-177b-4e6a-8abd-c8718fa70b47/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:21:57,042 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73fd7ef1-177b-4e6a-8abd-c8718fa70b47/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:21:57,045 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73fd7ef1-177b-4e6a-8abd-c8718fa70b47/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2021-11-20 23:21:57,127 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:21:57,129 INFO L263 TraceCheckSpWp]: Trace formula consists of 359 conjuncts, 20 conjunts are in the unsatisfiable core [2021-11-20 23:21:57,132 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:21:57,431 INFO L134 CoverageAnalysis]: Checked inductivity of 261 backedges. 45 proven. 36 refuted. 0 times theorem prover too weak. 180 trivial. 0 not checked. [2021-11-20 23:21:57,431 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:21:57,560 INFO L134 CoverageAnalysis]: Checked inductivity of 261 backedges. 45 proven. 36 refuted. 0 times theorem prover too weak. 180 trivial. 0 not checked. [2021-11-20 23:21:57,561 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [940374350] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:21:57,561 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1131527113] [2021-11-20 23:21:57,562 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2021-11-20 23:21:57,563 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:21:57,563 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:21:57,563 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:21:57,563 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:21:57,636 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:21:57,655 INFO L354 Elim1Store]: treesize reduction 24, result has 44.2 percent of original size [2021-11-20 23:21:57,655 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 24 treesize of output 40 [2021-11-20 23:21:57,684 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:21:57,705 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-20 23:21:57,705 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-20 23:21:57,756 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:21:57,757 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 39 treesize of output 41 [2021-11-20 23:21:57,864 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:21:57,866 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:21:57,867 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:21:57,879 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-20 23:21:57,879 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 240 treesize of output 228 [2021-11-20 23:21:58,064 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 21 [2021-11-20 23:21:58,851 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:21:59,039 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:21:59,039 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:21:59,039 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 21] total 32 [2021-11-20 23:21:59,040 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [515486792] [2021-11-20 23:21:59,040 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:21:59,040 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2021-11-20 23:21:59,041 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:21:59,041 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2021-11-20 23:21:59,041 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=266, Invalid=1066, Unknown=0, NotChecked=0, Total=1332 [2021-11-20 23:21:59,041 INFO L87 Difference]: Start difference. First operand 97 states and 107 transitions. Second operand has 32 states, 32 states have (on average 1.46875) internal successors, (47), 32 states have internal predecessors, (47), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:21:59,418 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:21:59,419 INFO L93 Difference]: Finished difference Result 230 states and 255 transitions. [2021-11-20 23:21:59,419 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-11-20 23:21:59,419 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 1.46875) internal successors, (47), 32 states have internal predecessors, (47), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 68 [2021-11-20 23:21:59,419 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:21:59,420 INFO L225 Difference]: With dead ends: 230 [2021-11-20 23:21:59,420 INFO L226 Difference]: Without dead ends: 98 [2021-11-20 23:21:59,420 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 232 GetRequests, 188 SyntacticMatches, 0 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 512 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=421, Invalid=1649, Unknown=0, NotChecked=0, Total=2070 [2021-11-20 23:21:59,421 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 3 mSDsluCounter, 23 mSDsCounter, 0 mSdLazyCounter, 422 mSolverCounterSat, 107 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 13 SdHoareTripleChecker+Invalid, 529 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 107 IncrementalHoareTripleChecker+Valid, 422 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-20 23:21:59,421 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [3 Valid, 13 Invalid, 529 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [107 Valid, 422 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-20 23:21:59,422 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 98 states. [2021-11-20 23:21:59,454 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 98 to 98. [2021-11-20 23:21:59,455 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 98 states, 97 states have (on average 1.1134020618556701) internal successors, (108), 97 states have internal predecessors, (108), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:21:59,455 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 98 states to 98 states and 108 transitions. [2021-11-20 23:21:59,455 INFO L78 Accepts]: Start accepts. Automaton has 98 states and 108 transitions. Word has length 68 [2021-11-20 23:21:59,455 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:21:59,455 INFO L470 AbstractCegarLoop]: Abstraction has 98 states and 108 transitions. [2021-11-20 23:21:59,456 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 32 states have (on average 1.46875) internal successors, (47), 32 states have internal predecessors, (47), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:21:59,456 INFO L276 IsEmpty]: Start isEmpty. Operand 98 states and 108 transitions. [2021-11-20 23:21:59,457 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 70 [2021-11-20 23:21:59,457 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:21:59,457 INFO L514 BasicCegarLoop]: trace histogram [9, 9, 8, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:21:59,485 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73fd7ef1-177b-4e6a-8abd-c8718fa70b47/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Forceful destruction successful, exit code 0 [2021-11-20 23:21:59,672 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73fd7ef1-177b-4e6a-8abd-c8718fa70b47/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable23 [2021-11-20 23:21:59,672 INFO L402 AbstractCegarLoop]: === Iteration 25 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:21:59,673 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:21:59,673 INFO L85 PathProgramCache]: Analyzing trace with hash 1889562995, now seen corresponding path program 23 times [2021-11-20 23:21:59,674 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:21:59,674 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [862269985] [2021-11-20 23:21:59,674 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:21:59,674 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:21:59,700 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:21:59,911 INFO L134 CoverageAnalysis]: Checked inductivity of 270 backedges. 28 proven. 53 refuted. 0 times theorem prover too weak. 189 trivial. 0 not checked. [2021-11-20 23:21:59,912 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:21:59,912 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [862269985] [2021-11-20 23:21:59,912 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [862269985] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:21:59,912 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1059082941] [2021-11-20 23:21:59,912 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-20 23:21:59,912 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:21:59,913 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73fd7ef1-177b-4e6a-8abd-c8718fa70b47/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:21:59,916 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73fd7ef1-177b-4e6a-8abd-c8718fa70b47/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:21:59,940 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73fd7ef1-177b-4e6a-8abd-c8718fa70b47/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Waiting until timeout for monitored process [2021-11-20 23:22:00,110 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2021-11-20 23:22:00,110 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:22:00,114 INFO L263 TraceCheckSpWp]: Trace formula consists of 365 conjuncts, 20 conjunts are in the unsatisfiable core [2021-11-20 23:22:00,116 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:22:00,610 INFO L134 CoverageAnalysis]: Checked inductivity of 270 backedges. 36 proven. 45 refuted. 0 times theorem prover too weak. 189 trivial. 0 not checked. [2021-11-20 23:22:00,610 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:22:00,765 INFO L134 CoverageAnalysis]: Checked inductivity of 270 backedges. 36 proven. 45 refuted. 0 times theorem prover too weak. 189 trivial. 0 not checked. [2021-11-20 23:22:00,765 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1059082941] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:22:00,765 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1689904066] [2021-11-20 23:22:00,767 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2021-11-20 23:22:00,767 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:22:00,768 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:22:00,768 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:22:00,768 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:22:00,818 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:22:00,843 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-20 23:22:00,843 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-20 23:22:00,870 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:22:00,871 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 32 [2021-11-20 23:22:00,950 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:22:00,951 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 34 treesize of output 36 [2021-11-20 23:22:01,068 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:22:01,069 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:22:01,096 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-20 23:22:01,097 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 230 treesize of output 229 [2021-11-20 23:22:01,668 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 21 [2021-11-20 23:22:02,601 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:22:02,830 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:22:02,831 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:22:02,831 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 21] total 40 [2021-11-20 23:22:02,831 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [902630216] [2021-11-20 23:22:02,831 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:22:02,831 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 40 states [2021-11-20 23:22:02,832 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:22:02,832 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2021-11-20 23:22:02,833 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=303, Invalid=1677, Unknown=0, NotChecked=0, Total=1980 [2021-11-20 23:22:02,833 INFO L87 Difference]: Start difference. First operand 98 states and 108 transitions. Second operand has 40 states, 40 states have (on average 1.725) internal successors, (69), 40 states have internal predecessors, (69), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:22:03,399 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:22:03,400 INFO L93 Difference]: Finished difference Result 152 states and 172 transitions. [2021-11-20 23:22:03,400 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-11-20 23:22:03,400 INFO L78 Accepts]: Start accepts. Automaton has has 40 states, 40 states have (on average 1.725) internal successors, (69), 40 states have internal predecessors, (69), 0 states have call successors, (0), 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 69 [2021-11-20 23:22:03,400 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:22:03,401 INFO L225 Difference]: With dead ends: 152 [2021-11-20 23:22:03,401 INFO L226 Difference]: Without dead ends: 75 [2021-11-20 23:22:03,402 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 247 GetRequests, 191 SyntacticMatches, 2 SemanticMatches, 54 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 957 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=580, Invalid=2500, Unknown=0, NotChecked=0, Total=3080 [2021-11-20 23:22:03,402 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 17 mSDsluCounter, 14 mSDsCounter, 0 mSdLazyCounter, 577 mSolverCounterSat, 400 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 17 SdHoareTripleChecker+Valid, 17 SdHoareTripleChecker+Invalid, 977 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 400 IncrementalHoareTripleChecker+Valid, 577 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-20 23:22:03,403 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [17 Valid, 17 Invalid, 977 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [400 Valid, 577 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-20 23:22:03,403 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2021-11-20 23:22:03,433 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 75. [2021-11-20 23:22:03,433 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 75 states, 74 states have (on average 1.0945945945945945) internal successors, (81), 74 states have internal predecessors, (81), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:22:03,433 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 81 transitions. [2021-11-20 23:22:03,434 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 81 transitions. Word has length 69 [2021-11-20 23:22:03,434 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:22:03,434 INFO L470 AbstractCegarLoop]: Abstraction has 75 states and 81 transitions. [2021-11-20 23:22:03,434 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 40 states, 40 states have (on average 1.725) internal successors, (69), 40 states have internal predecessors, (69), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:22:03,434 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 81 transitions. [2021-11-20 23:22:03,435 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2021-11-20 23:22:03,435 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:22:03,435 INFO L514 BasicCegarLoop]: trace histogram [9, 9, 9, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:22:03,472 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73fd7ef1-177b-4e6a-8abd-c8718fa70b47/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Ended with exit code 0 [2021-11-20 23:22:03,648 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable24,24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73fd7ef1-177b-4e6a-8abd-c8718fa70b47/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:22:03,648 INFO L402 AbstractCegarLoop]: === Iteration 26 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:22:03,649 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:22:03,649 INFO L85 PathProgramCache]: Analyzing trace with hash -800666363, now seen corresponding path program 24 times [2021-11-20 23:22:03,649 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:22:03,649 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1641500154] [2021-11-20 23:22:03,649 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:22:03,649 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:22:04,003 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:22:14,535 INFO L134 CoverageAnalysis]: Checked inductivity of 315 backedges. 15 proven. 300 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:22:14,535 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:22:14,535 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1641500154] [2021-11-20 23:22:14,535 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1641500154] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:22:14,535 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1655883101] [2021-11-20 23:22:14,536 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-20 23:22:14,536 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:22:14,536 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73fd7ef1-177b-4e6a-8abd-c8718fa70b47/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:22:14,541 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73fd7ef1-177b-4e6a-8abd-c8718fa70b47/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:22:14,543 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73fd7ef1-177b-4e6a-8abd-c8718fa70b47/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Waiting until timeout for monitored process [2021-11-20 23:22:14,689 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-20 23:22:14,689 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:22:14,693 WARN L261 TraceCheckSpWp]: Trace formula consists of 311 conjuncts, 223 conjunts are in the unsatisfiable core [2021-11-20 23:22:14,695 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:22:24,464 INFO L134 CoverageAnalysis]: Checked inductivity of 315 backedges. 0 proven. 270 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2021-11-20 23:22:24,465 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:22:46,471 INFO L354 Elim1Store]: treesize reduction 1362, result has 39.3 percent of original size [2021-11-20 23:22:46,471 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 18 select indices, 18 select index equivalence classes, 0 disjoint index pairs (out of 153 index pairs), introduced 18 new quantified variables, introduced 153 case distinctions, treesize of input 154 treesize of output 905 [2021-11-20 23:23:14,522 INFO L354 Elim1Store]: treesize reduction 2208, result has 1.6 percent of original size [2021-11-20 23:23:14,522 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 18 select indices, 18 select index equivalence classes, 0 disjoint index pairs (out of 153 index pairs), introduced 18 new quantified variables, introduced 153 case distinctions, treesize of input 155 treesize of output 60 [2021-11-20 23:23:14,791 INFO L134 CoverageAnalysis]: Checked inductivity of 315 backedges. 0 proven. 270 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2021-11-20 23:23:14,792 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1655883101] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:23:14,792 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1217177014] [2021-11-20 23:23:14,793 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2021-11-20 23:23:14,793 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:23:14,793 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:23:14,793 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:23:14,793 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:23:14,843 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:23:14,868 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-20 23:23:14,868 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-20 23:23:14,891 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:23:14,892 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 32 [2021-11-20 23:23:14,944 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:23:14,949 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 34 treesize of output 36 [2021-11-20 23:23:15,126 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:23:15,127 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:23:15,152 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-20 23:23:15,152 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 230 treesize of output 229 [2021-11-20 23:23:15,511 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 21 [2021-11-20 23:23:16,341 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:23:17,798 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:23:17,798 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:23:17,799 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [73, 60, 61] total 161 [2021-11-20 23:23:17,799 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1126963493] [2021-11-20 23:23:17,799 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:23:17,800 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 161 states [2021-11-20 23:23:17,800 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:23:17,801 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 161 interpolants. [2021-11-20 23:23:17,803 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=663, Invalid=26727, Unknown=0, NotChecked=0, Total=27390 [2021-11-20 23:23:17,803 INFO L87 Difference]: Start difference. First operand 75 states and 81 transitions. Second operand has 161 states, 161 states have (on average 1.0993788819875776) internal successors, (177), 161 states have internal predecessors, (177), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:23:48,197 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:23:48,198 INFO L93 Difference]: Finished difference Result 186 states and 207 transitions. [2021-11-20 23:23:48,198 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 107 states. [2021-11-20 23:23:48,199 INFO L78 Accepts]: Start accepts. Automaton has has 161 states, 161 states have (on average 1.0993788819875776) internal successors, (177), 161 states have internal predecessors, (177), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 74 [2021-11-20 23:23:48,199 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:23:48,200 INFO L225 Difference]: With dead ends: 186 [2021-11-20 23:23:48,200 INFO L226 Difference]: Without dead ends: 183 [2021-11-20 23:23:48,202 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 354 GetRequests, 100 SyntacticMatches, 29 SemanticMatches, 225 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12749 ImplicationChecksByTransitivity, 55.5s TimeCoverageRelationStatistics Valid=1641, Invalid=49661, Unknown=0, NotChecked=0, Total=51302 [2021-11-20 23:23:48,203 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 20 mSDsluCounter, 186 mSDsCounter, 0 mSdLazyCounter, 7776 mSolverCounterSat, 327 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 8.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 20 SdHoareTripleChecker+Valid, 185 SdHoareTripleChecker+Invalid, 8103 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 327 IncrementalHoareTripleChecker+Valid, 7776 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 9.2s IncrementalHoareTripleChecker+Time [2021-11-20 23:23:48,203 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [20 Valid, 185 Invalid, 8103 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [327 Valid, 7776 Invalid, 0 Unknown, 0 Unchecked, 9.2s Time] [2021-11-20 23:23:48,204 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 183 states. [2021-11-20 23:23:48,271 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 183 to 129. [2021-11-20 23:23:48,272 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 129 states, 128 states have (on average 1.1171875) internal successors, (143), 128 states have internal predecessors, (143), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:23:48,272 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 129 states to 129 states and 143 transitions. [2021-11-20 23:23:48,273 INFO L78 Accepts]: Start accepts. Automaton has 129 states and 143 transitions. Word has length 74 [2021-11-20 23:23:48,273 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:23:48,273 INFO L470 AbstractCegarLoop]: Abstraction has 129 states and 143 transitions. [2021-11-20 23:23:48,273 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 161 states, 161 states have (on average 1.0993788819875776) internal successors, (177), 161 states have internal predecessors, (177), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:23:48,273 INFO L276 IsEmpty]: Start isEmpty. Operand 129 states and 143 transitions. [2021-11-20 23:23:48,274 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2021-11-20 23:23:48,274 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:23:48,274 INFO L514 BasicCegarLoop]: trace histogram [10, 9, 9, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:23:48,316 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73fd7ef1-177b-4e6a-8abd-c8718fa70b47/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Forceful destruction successful, exit code 0 [2021-11-20 23:23:48,488 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73fd7ef1-177b-4e6a-8abd-c8718fa70b47/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable25 [2021-11-20 23:23:48,488 INFO L402 AbstractCegarLoop]: === Iteration 27 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:23:48,489 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:23:48,489 INFO L85 PathProgramCache]: Analyzing trace with hash 1747734737, now seen corresponding path program 25 times [2021-11-20 23:23:48,489 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:23:48,489 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1988776759] [2021-11-20 23:23:48,489 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:23:48,489 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:23:48,520 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:23:48,765 INFO L134 CoverageAnalysis]: Checked inductivity of 325 backedges. 46 proven. 54 refuted. 0 times theorem prover too weak. 225 trivial. 0 not checked. [2021-11-20 23:23:48,766 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:23:48,766 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1988776759] [2021-11-20 23:23:48,766 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1988776759] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:23:48,766 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [687668926] [2021-11-20 23:23:48,766 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-20 23:23:48,766 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:23:48,766 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73fd7ef1-177b-4e6a-8abd-c8718fa70b47/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:23:48,767 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73fd7ef1-177b-4e6a-8abd-c8718fa70b47/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:23:48,768 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73fd7ef1-177b-4e6a-8abd-c8718fa70b47/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Waiting until timeout for monitored process [2021-11-20 23:23:48,856 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:23:48,858 INFO L263 TraceCheckSpWp]: Trace formula consists of 395 conjuncts, 22 conjunts are in the unsatisfiable core [2021-11-20 23:23:48,860 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:23:49,249 INFO L134 CoverageAnalysis]: Checked inductivity of 325 backedges. 55 proven. 45 refuted. 0 times theorem prover too weak. 225 trivial. 0 not checked. [2021-11-20 23:23:49,250 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:23:49,424 INFO L134 CoverageAnalysis]: Checked inductivity of 325 backedges. 55 proven. 45 refuted. 0 times theorem prover too weak. 225 trivial. 0 not checked. [2021-11-20 23:23:49,424 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [687668926] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:23:49,425 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [185924900] [2021-11-20 23:23:49,426 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2021-11-20 23:23:49,427 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:23:49,427 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:23:49,427 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:23:49,427 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:23:49,501 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:23:49,525 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-20 23:23:49,525 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-20 23:23:49,545 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:23:49,546 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 32 [2021-11-20 23:23:49,618 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:23:49,619 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 34 treesize of output 36 [2021-11-20 23:23:49,703 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:23:49,704 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:23:49,726 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-20 23:23:49,727 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 230 treesize of output 229 [2021-11-20 23:23:50,178 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 21 [2021-11-20 23:23:51,204 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:23:51,458 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:23:51,458 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:23:51,459 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23, 23] total 35 [2021-11-20 23:23:51,459 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1775465470] [2021-11-20 23:23:51,459 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:23:51,459 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2021-11-20 23:23:51,459 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:23:51,460 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2021-11-20 23:23:51,460 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=313, Invalid=1247, Unknown=0, NotChecked=0, Total=1560 [2021-11-20 23:23:51,461 INFO L87 Difference]: Start difference. First operand 129 states and 143 transitions. Second operand has 35 states, 35 states have (on average 1.4285714285714286) internal successors, (50), 35 states have internal predecessors, (50), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:23:52,069 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:23:52,069 INFO L93 Difference]: Finished difference Result 265 states and 292 transitions. [2021-11-20 23:23:52,069 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-11-20 23:23:52,069 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 35 states have (on average 1.4285714285714286) internal successors, (50), 35 states have internal predecessors, (50), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 75 [2021-11-20 23:23:52,069 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:23:52,070 INFO L225 Difference]: With dead ends: 265 [2021-11-20 23:23:52,070 INFO L226 Difference]: Without dead ends: 119 [2021-11-20 23:23:52,071 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 256 GetRequests, 208 SyntacticMatches, 0 SemanticMatches, 48 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 603 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=500, Invalid=1950, Unknown=0, NotChecked=0, Total=2450 [2021-11-20 23:23:52,071 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 7 mSDsluCounter, 22 mSDsCounter, 0 mSdLazyCounter, 581 mSolverCounterSat, 127 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 11 SdHoareTripleChecker+Invalid, 708 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 127 IncrementalHoareTripleChecker+Valid, 581 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-20 23:23:52,072 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [7 Valid, 11 Invalid, 708 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [127 Valid, 581 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-20 23:23:52,072 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 119 states. [2021-11-20 23:23:52,131 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 119 to 119. [2021-11-20 23:23:52,131 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 119 states, 118 states have (on average 1.1101694915254237) internal successors, (131), 118 states have internal predecessors, (131), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:23:52,132 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 119 states to 119 states and 131 transitions. [2021-11-20 23:23:52,132 INFO L78 Accepts]: Start accepts. Automaton has 119 states and 131 transitions. Word has length 75 [2021-11-20 23:23:52,132 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:23:52,133 INFO L470 AbstractCegarLoop]: Abstraction has 119 states and 131 transitions. [2021-11-20 23:23:52,133 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 35 states have (on average 1.4285714285714286) internal successors, (50), 35 states have internal predecessors, (50), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:23:52,133 INFO L276 IsEmpty]: Start isEmpty. Operand 119 states and 131 transitions. [2021-11-20 23:23:52,134 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2021-11-20 23:23:52,134 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:23:52,134 INFO L514 BasicCegarLoop]: trace histogram [10, 10, 9, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:23:52,166 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73fd7ef1-177b-4e6a-8abd-c8718fa70b47/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Ended with exit code 0 [2021-11-20 23:23:52,348 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73fd7ef1-177b-4e6a-8abd-c8718fa70b47/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable26 [2021-11-20 23:23:52,348 INFO L402 AbstractCegarLoop]: === Iteration 28 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:23:52,349 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:23:52,349 INFO L85 PathProgramCache]: Analyzing trace with hash -140345474, now seen corresponding path program 26 times [2021-11-20 23:23:52,349 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:23:52,349 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [656131907] [2021-11-20 23:23:52,349 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:23:52,349 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:23:52,423 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:23:52,704 INFO L134 CoverageAnalysis]: Checked inductivity of 335 backedges. 36 proven. 64 refuted. 0 times theorem prover too weak. 235 trivial. 0 not checked. [2021-11-20 23:23:52,704 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:23:52,704 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [656131907] [2021-11-20 23:23:52,705 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [656131907] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:23:52,705 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2110663434] [2021-11-20 23:23:52,705 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-20 23:23:52,705 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:23:52,705 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73fd7ef1-177b-4e6a-8abd-c8718fa70b47/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:23:52,708 INFO L229 MonitoredProcess]: Starting monitored process 27 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73fd7ef1-177b-4e6a-8abd-c8718fa70b47/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:23:52,735 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73fd7ef1-177b-4e6a-8abd-c8718fa70b47/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Waiting until timeout for monitored process [2021-11-20 23:23:52,930 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2021-11-20 23:23:52,931 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:23:52,935 INFO L263 TraceCheckSpWp]: Trace formula consists of 401 conjuncts, 22 conjunts are in the unsatisfiable core [2021-11-20 23:23:52,938 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:23:53,614 INFO L134 CoverageAnalysis]: Checked inductivity of 335 backedges. 45 proven. 55 refuted. 0 times theorem prover too weak. 235 trivial. 0 not checked. [2021-11-20 23:23:53,614 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:23:53,831 INFO L134 CoverageAnalysis]: Checked inductivity of 335 backedges. 45 proven. 55 refuted. 0 times theorem prover too weak. 235 trivial. 0 not checked. [2021-11-20 23:23:53,831 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2110663434] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:23:53,831 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [245145997] [2021-11-20 23:23:53,833 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2021-11-20 23:23:53,833 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:23:53,833 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:23:53,833 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:23:53,834 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:23:53,892 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:23:53,921 INFO L354 Elim1Store]: treesize reduction 24, result has 44.2 percent of original size [2021-11-20 23:23:53,921 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 24 treesize of output 40 [2021-11-20 23:23:53,978 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:23:53,981 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:23:54,011 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-20 23:23:54,012 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-20 23:23:54,105 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:23:54,106 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 34 treesize of output 36 [2021-11-20 23:23:54,239 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:23:54,240 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:23:54,272 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-20 23:23:54,272 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 230 treesize of output 229 [2021-11-20 23:23:54,666 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 21 [2021-11-20 23:23:55,670 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:23:55,884 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:23:55,884 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:23:55,884 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23, 23] total 44 [2021-11-20 23:23:55,884 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1150085648] [2021-11-20 23:23:55,884 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:23:55,884 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 44 states [2021-11-20 23:23:55,885 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:23:55,885 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2021-11-20 23:23:55,885 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=359, Invalid=1993, Unknown=0, NotChecked=0, Total=2352 [2021-11-20 23:23:55,886 INFO L87 Difference]: Start difference. First operand 119 states and 131 transitions. Second operand has 44 states, 44 states have (on average 1.6818181818181819) internal successors, (74), 44 states have internal predecessors, (74), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:23:56,450 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:23:56,450 INFO L93 Difference]: Finished difference Result 178 states and 200 transitions. [2021-11-20 23:23:56,451 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2021-11-20 23:23:56,451 INFO L78 Accepts]: Start accepts. Automaton has has 44 states, 44 states have (on average 1.6818181818181819) internal successors, (74), 44 states have internal predecessors, (74), 0 states have call successors, (0), 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 76 [2021-11-20 23:23:56,451 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:23:56,451 INFO L225 Difference]: With dead ends: 178 [2021-11-20 23:23:56,451 INFO L226 Difference]: Without dead ends: 93 [2021-11-20 23:23:56,452 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 272 GetRequests, 211 SyntacticMatches, 2 SemanticMatches, 59 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1150 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=691, Invalid=2969, Unknown=0, NotChecked=0, Total=3660 [2021-11-20 23:23:56,453 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 16 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 570 mSolverCounterSat, 428 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 16 SdHoareTripleChecker+Valid, 15 SdHoareTripleChecker+Invalid, 998 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 428 IncrementalHoareTripleChecker+Valid, 570 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-20 23:23:56,453 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [16 Valid, 15 Invalid, 998 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [428 Valid, 570 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-20 23:23:56,453 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2021-11-20 23:23:56,486 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 82. [2021-11-20 23:23:56,487 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 82 states, 81 states have (on average 1.0864197530864197) internal successors, (88), 81 states have internal predecessors, (88), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:23:56,487 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 88 transitions. [2021-11-20 23:23:56,487 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 88 transitions. Word has length 76 [2021-11-20 23:23:56,488 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:23:56,488 INFO L470 AbstractCegarLoop]: Abstraction has 82 states and 88 transitions. [2021-11-20 23:23:56,488 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 44 states, 44 states have (on average 1.6818181818181819) internal successors, (74), 44 states have internal predecessors, (74), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:23:56,488 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 88 transitions. [2021-11-20 23:23:56,489 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 82 [2021-11-20 23:23:56,489 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:23:56,489 INFO L514 BasicCegarLoop]: trace histogram [10, 10, 10, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:23:56,538 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73fd7ef1-177b-4e6a-8abd-c8718fa70b47/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Forceful destruction successful, exit code 0 [2021-11-20 23:23:56,716 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73fd7ef1-177b-4e6a-8abd-c8718fa70b47/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable27 [2021-11-20 23:23:56,716 INFO L402 AbstractCegarLoop]: === Iteration 29 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:23:56,716 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:23:56,717 INFO L85 PathProgramCache]: Analyzing trace with hash -1043686098, now seen corresponding path program 27 times [2021-11-20 23:23:56,717 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:23:56,717 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [959847651] [2021-11-20 23:23:56,717 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:23:56,717 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:23:57,156 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:24:08,638 INFO L134 CoverageAnalysis]: Checked inductivity of 385 backedges. 15 proven. 370 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:24:08,638 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:24:08,639 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [959847651] [2021-11-20 23:24:08,639 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [959847651] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:24:08,639 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1187781671] [2021-11-20 23:24:08,639 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-20 23:24:08,639 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:24:08,639 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73fd7ef1-177b-4e6a-8abd-c8718fa70b47/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:24:08,640 INFO L229 MonitoredProcess]: Starting monitored process 28 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73fd7ef1-177b-4e6a-8abd-c8718fa70b47/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:24:08,642 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73fd7ef1-177b-4e6a-8abd-c8718fa70b47/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Waiting until timeout for monitored process [2021-11-20 23:24:08,795 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-20 23:24:08,795 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:24:08,800 WARN L261 TraceCheckSpWp]: Trace formula consists of 341 conjuncts, 247 conjunts are in the unsatisfiable core [2021-11-20 23:24:08,803 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:24:20,566 INFO L134 CoverageAnalysis]: Checked inductivity of 385 backedges. 0 proven. 330 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2021-11-20 23:24:20,567 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:24:50,015 INFO L354 Elim1Store]: treesize reduction 1703, result has 39.0 percent of original size [2021-11-20 23:24:50,016 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 20 select indices, 20 select index equivalence classes, 0 disjoint index pairs (out of 190 index pairs), introduced 20 new quantified variables, introduced 190 case distinctions, treesize of input 172 treesize of output 1116 [2021-11-20 23:25:34,753 INFO L354 Elim1Store]: treesize reduction 2753, result has 1.5 percent of original size [2021-11-20 23:25:34,753 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 20 select indices, 20 select index equivalence classes, 0 disjoint index pairs (out of 190 index pairs), introduced 20 new quantified variables, introduced 190 case distinctions, treesize of input 171 treesize of output 65 [2021-11-20 23:25:35,062 INFO L134 CoverageAnalysis]: Checked inductivity of 385 backedges. 0 proven. 330 refuted. 0 times theorem prover too weak. 55 trivial. 0 not checked. [2021-11-20 23:25:35,063 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1187781671] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:25:35,063 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [466653965] [2021-11-20 23:25:35,064 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2021-11-20 23:25:35,065 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:25:35,065 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:25:35,065 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:25:35,066 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:25:35,115 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:25:35,138 INFO L354 Elim1Store]: treesize reduction 24, result has 44.2 percent of original size [2021-11-20 23:25:35,138 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 24 treesize of output 40 [2021-11-20 23:25:35,179 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:25:35,208 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-20 23:25:35,208 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-20 23:25:35,292 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:25:35,293 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 39 treesize of output 41 [2021-11-20 23:25:35,370 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:25:35,372 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:25:35,374 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:25:35,387 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-20 23:25:35,387 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 240 treesize of output 228 [2021-11-20 23:25:35,634 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 21 [2021-11-20 23:25:36,474 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:25:37,776 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:25:37,776 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:25:37,776 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [80, 66, 67] total 178 [2021-11-20 23:25:37,777 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [186947983] [2021-11-20 23:25:37,777 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:25:37,777 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 178 states [2021-11-20 23:25:37,778 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:25:37,778 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 178 interpolants. [2021-11-20 23:25:37,780 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=706, Invalid=32600, Unknown=0, NotChecked=0, Total=33306 [2021-11-20 23:25:37,781 INFO L87 Difference]: Start difference. First operand 82 states and 88 transitions. Second operand has 178 states, 178 states have (on average 1.0898876404494382) internal successors, (194), 178 states have internal predecessors, (194), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:26:17,376 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:26:17,376 INFO L93 Difference]: Finished difference Result 197 states and 217 transitions. [2021-11-20 23:26:17,377 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 118 states. [2021-11-20 23:26:17,377 INFO L78 Accepts]: Start accepts. Automaton has has 178 states, 178 states have (on average 1.0898876404494382) internal successors, (194), 178 states have internal predecessors, (194), 0 states have call successors, (0), 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 81 [2021-11-20 23:26:17,377 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:26:17,378 INFO L225 Difference]: With dead ends: 197 [2021-11-20 23:26:17,379 INFO L226 Difference]: Without dead ends: 194 [2021-11-20 23:26:17,382 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 392 GetRequests, 113 SyntacticMatches, 27 SemanticMatches, 252 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14799 ImplicationChecksByTransitivity, 71.2s TimeCoverageRelationStatistics Valid=2341, Invalid=61921, Unknown=0, NotChecked=0, Total=64262 [2021-11-20 23:26:17,382 INFO L933 BasicCegarLoop]: 5 mSDtfsCounter, 11 mSDsluCounter, 441 mSDsCounter, 0 mSdLazyCounter, 10255 mSolverCounterSat, 357 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 10.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 442 SdHoareTripleChecker+Invalid, 10612 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 357 IncrementalHoareTripleChecker+Valid, 10255 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 11.5s IncrementalHoareTripleChecker+Time [2021-11-20 23:26:17,383 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [11 Valid, 442 Invalid, 10612 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [357 Valid, 10255 Invalid, 0 Unknown, 0 Unchecked, 11.5s Time] [2021-11-20 23:26:17,383 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 194 states. [2021-11-20 23:26:17,446 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 194 to 117. [2021-11-20 23:26:17,446 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 117 states, 116 states have (on average 1.0948275862068966) internal successors, (127), 116 states have internal predecessors, (127), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:26:17,447 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 117 states to 117 states and 127 transitions. [2021-11-20 23:26:17,447 INFO L78 Accepts]: Start accepts. Automaton has 117 states and 127 transitions. Word has length 81 [2021-11-20 23:26:17,447 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:26:17,447 INFO L470 AbstractCegarLoop]: Abstraction has 117 states and 127 transitions. [2021-11-20 23:26:17,448 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 178 states, 178 states have (on average 1.0898876404494382) internal successors, (194), 178 states have internal predecessors, (194), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:26:17,448 INFO L276 IsEmpty]: Start isEmpty. Operand 117 states and 127 transitions. [2021-11-20 23:26:17,448 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2021-11-20 23:26:17,448 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:26:17,449 INFO L514 BasicCegarLoop]: trace histogram [11, 10, 10, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:26:17,474 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73fd7ef1-177b-4e6a-8abd-c8718fa70b47/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Forceful destruction successful, exit code 0 [2021-11-20 23:26:17,660 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73fd7ef1-177b-4e6a-8abd-c8718fa70b47/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable28 [2021-11-20 23:26:17,660 INFO L402 AbstractCegarLoop]: === Iteration 30 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:26:17,660 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:26:17,660 INFO L85 PathProgramCache]: Analyzing trace with hash -1534804128, now seen corresponding path program 28 times [2021-11-20 23:26:17,661 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:26:17,661 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1141906441] [2021-11-20 23:26:17,661 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:26:17,661 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:26:17,694 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:26:17,939 INFO L134 CoverageAnalysis]: Checked inductivity of 396 backedges. 56 proven. 65 refuted. 0 times theorem prover too weak. 275 trivial. 0 not checked. [2021-11-20 23:26:17,940 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:26:17,940 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1141906441] [2021-11-20 23:26:17,940 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1141906441] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:26:17,940 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1545830913] [2021-11-20 23:26:17,940 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-20 23:26:17,940 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:26:17,941 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73fd7ef1-177b-4e6a-8abd-c8718fa70b47/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:26:17,941 INFO L229 MonitoredProcess]: Starting monitored process 29 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73fd7ef1-177b-4e6a-8abd-c8718fa70b47/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:26:17,960 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73fd7ef1-177b-4e6a-8abd-c8718fa70b47/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Waiting until timeout for monitored process [2021-11-20 23:26:18,044 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:26:18,047 INFO L263 TraceCheckSpWp]: Trace formula consists of 431 conjuncts, 24 conjunts are in the unsatisfiable core [2021-11-20 23:26:18,049 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:26:18,498 INFO L134 CoverageAnalysis]: Checked inductivity of 396 backedges. 66 proven. 55 refuted. 0 times theorem prover too weak. 275 trivial. 0 not checked. [2021-11-20 23:26:18,498 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:26:18,683 INFO L134 CoverageAnalysis]: Checked inductivity of 396 backedges. 66 proven. 55 refuted. 0 times theorem prover too weak. 275 trivial. 0 not checked. [2021-11-20 23:26:18,683 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1545830913] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:26:18,683 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [326855508] [2021-11-20 23:26:18,685 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2021-11-20 23:26:18,685 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:26:18,685 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:26:18,685 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:26:18,685 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:26:18,739 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:26:18,762 INFO L354 Elim1Store]: treesize reduction 24, result has 44.2 percent of original size [2021-11-20 23:26:18,762 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 24 treesize of output 40 [2021-11-20 23:26:18,799 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:26:18,823 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-20 23:26:18,824 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-20 23:26:18,895 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:26:18,895 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 34 treesize of output 36 [2021-11-20 23:26:18,975 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:26:18,976 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:26:18,994 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-20 23:26:18,994 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 230 treesize of output 229 [2021-11-20 23:26:19,349 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 21 [2021-11-20 23:26:20,132 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:26:20,352 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:26:20,353 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:26:20,353 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 25] total 38 [2021-11-20 23:26:20,353 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [810299258] [2021-11-20 23:26:20,353 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:26:20,353 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 38 states [2021-11-20 23:26:20,353 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:26:20,354 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2021-11-20 23:26:20,354 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=364, Invalid=1442, Unknown=0, NotChecked=0, Total=1806 [2021-11-20 23:26:20,354 INFO L87 Difference]: Start difference. First operand 117 states and 127 transitions. Second operand has 38 states, 38 states have (on average 1.394736842105263) internal successors, (53), 38 states have internal predecessors, (53), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:26:20,958 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:26:20,959 INFO L93 Difference]: Finished difference Result 278 states and 303 transitions. [2021-11-20 23:26:20,959 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-11-20 23:26:20,959 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 38 states have (on average 1.394736842105263) internal successors, (53), 38 states have internal predecessors, (53), 0 states have call successors, (0), 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 82 [2021-11-20 23:26:20,960 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:26:20,960 INFO L225 Difference]: With dead ends: 278 [2021-11-20 23:26:20,960 INFO L226 Difference]: Without dead ends: 118 [2021-11-20 23:26:20,961 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 280 GetRequests, 228 SyntacticMatches, 0 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 701 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=586, Invalid=2276, Unknown=0, NotChecked=0, Total=2862 [2021-11-20 23:26:20,962 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 11 mSDsluCounter, 36 mSDsCounter, 0 mSdLazyCounter, 650 mSolverCounterSat, 154 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 23 SdHoareTripleChecker+Invalid, 804 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 154 IncrementalHoareTripleChecker+Valid, 650 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-20 23:26:20,962 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [11 Valid, 23 Invalid, 804 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [154 Valid, 650 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-20 23:26:20,963 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 118 states. [2021-11-20 23:26:21,050 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 118 to 118. [2021-11-20 23:26:21,050 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 118 states, 117 states have (on average 1.0940170940170941) internal successors, (128), 117 states have internal predecessors, (128), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:26:21,051 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 118 states to 118 states and 128 transitions. [2021-11-20 23:26:21,051 INFO L78 Accepts]: Start accepts. Automaton has 118 states and 128 transitions. Word has length 82 [2021-11-20 23:26:21,051 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:26:21,051 INFO L470 AbstractCegarLoop]: Abstraction has 118 states and 128 transitions. [2021-11-20 23:26:21,052 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 38 states, 38 states have (on average 1.394736842105263) internal successors, (53), 38 states have internal predecessors, (53), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:26:21,052 INFO L276 IsEmpty]: Start isEmpty. Operand 118 states and 128 transitions. [2021-11-20 23:26:21,052 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2021-11-20 23:26:21,052 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:26:21,053 INFO L514 BasicCegarLoop]: trace histogram [11, 11, 10, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:26:21,091 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73fd7ef1-177b-4e6a-8abd-c8718fa70b47/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Forceful destruction successful, exit code 0 [2021-11-20 23:26:21,280 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29,29 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73fd7ef1-177b-4e6a-8abd-c8718fa70b47/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:26:21,280 INFO L402 AbstractCegarLoop]: === Iteration 31 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:26:21,280 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:26:21,281 INFO L85 PathProgramCache]: Analyzing trace with hash -1920326637, now seen corresponding path program 29 times [2021-11-20 23:26:21,281 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:26:21,281 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1537275102] [2021-11-20 23:26:21,281 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:26:21,281 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:26:21,318 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:26:21,567 INFO L134 CoverageAnalysis]: Checked inductivity of 407 backedges. 45 proven. 76 refuted. 0 times theorem prover too weak. 286 trivial. 0 not checked. [2021-11-20 23:26:21,567 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:26:21,567 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1537275102] [2021-11-20 23:26:21,567 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1537275102] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:26:21,567 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [637769727] [2021-11-20 23:26:21,567 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-20 23:26:21,568 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:26:21,568 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73fd7ef1-177b-4e6a-8abd-c8718fa70b47/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:26:21,572 INFO L229 MonitoredProcess]: Starting monitored process 30 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73fd7ef1-177b-4e6a-8abd-c8718fa70b47/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:26:21,588 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73fd7ef1-177b-4e6a-8abd-c8718fa70b47/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Waiting until timeout for monitored process [2021-11-20 23:26:21,854 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2021-11-20 23:26:21,854 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:26:21,859 INFO L263 TraceCheckSpWp]: Trace formula consists of 437 conjuncts, 24 conjunts are in the unsatisfiable core [2021-11-20 23:26:21,861 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:26:22,262 INFO L134 CoverageAnalysis]: Checked inductivity of 407 backedges. 55 proven. 66 refuted. 0 times theorem prover too weak. 286 trivial. 0 not checked. [2021-11-20 23:26:22,262 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:26:22,445 INFO L134 CoverageAnalysis]: Checked inductivity of 407 backedges. 55 proven. 66 refuted. 0 times theorem prover too weak. 286 trivial. 0 not checked. [2021-11-20 23:26:22,446 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [637769727] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:26:22,446 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [377721921] [2021-11-20 23:26:22,447 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2021-11-20 23:26:22,447 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:26:22,447 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:26:22,448 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:26:22,448 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:26:22,506 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:26:22,536 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-20 23:26:22,537 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-20 23:26:22,567 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:26:22,568 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 32 [2021-11-20 23:26:22,624 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:26:22,624 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 34 treesize of output 36 [2021-11-20 23:26:22,727 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:26:22,727 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:26:22,747 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-20 23:26:22,747 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 230 treesize of output 229 [2021-11-20 23:26:23,108 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 21 [2021-11-20 23:26:23,897 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:26:24,073 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:26:24,073 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:26:24,074 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 25] total 38 [2021-11-20 23:26:24,074 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [128294923] [2021-11-20 23:26:24,074 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:26:24,074 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 38 states [2021-11-20 23:26:24,074 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:26:24,074 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2021-11-20 23:26:24,075 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=353, Invalid=1453, Unknown=0, NotChecked=0, Total=1806 [2021-11-20 23:26:24,075 INFO L87 Difference]: Start difference. First operand 118 states and 128 transitions. Second operand has 38 states, 38 states have (on average 1.9210526315789473) internal successors, (73), 38 states have internal predecessors, (73), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:26:24,476 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:26:24,476 INFO L93 Difference]: Finished difference Result 182 states and 202 transitions. [2021-11-20 23:26:24,476 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-11-20 23:26:24,477 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 38 states have (on average 1.9210526315789473) internal successors, (73), 38 states have internal predecessors, (73), 0 states have call successors, (0), 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 83 [2021-11-20 23:26:24,477 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:26:24,477 INFO L225 Difference]: With dead ends: 182 [2021-11-20 23:26:24,477 INFO L226 Difference]: Without dead ends: 89 [2021-11-20 23:26:24,478 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 284 GetRequests, 229 SyntacticMatches, 2 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 926 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=720, Invalid=2250, Unknown=0, NotChecked=0, Total=2970 [2021-11-20 23:26:24,478 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 49 mSDsluCounter, 10 mSDsCounter, 0 mSdLazyCounter, 251 mSolverCounterSat, 345 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 49 SdHoareTripleChecker+Valid, 13 SdHoareTripleChecker+Invalid, 596 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 345 IncrementalHoareTripleChecker+Valid, 251 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-20 23:26:24,479 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [49 Valid, 13 Invalid, 596 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [345 Valid, 251 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-20 23:26:24,479 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 89 states. [2021-11-20 23:26:24,524 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 89 to 89. [2021-11-20 23:26:24,524 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 89 states, 88 states have (on average 1.0795454545454546) internal successors, (95), 88 states have internal predecessors, (95), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:26:24,525 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 95 transitions. [2021-11-20 23:26:24,525 INFO L78 Accepts]: Start accepts. Automaton has 89 states and 95 transitions. Word has length 83 [2021-11-20 23:26:24,525 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:26:24,525 INFO L470 AbstractCegarLoop]: Abstraction has 89 states and 95 transitions. [2021-11-20 23:26:24,525 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 38 states, 38 states have (on average 1.9210526315789473) internal successors, (73), 38 states have internal predecessors, (73), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:26:24,525 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 95 transitions. [2021-11-20 23:26:24,525 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2021-11-20 23:26:24,525 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:26:24,526 INFO L514 BasicCegarLoop]: trace histogram [11, 11, 11, 11, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:26:24,547 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73fd7ef1-177b-4e6a-8abd-c8718fa70b47/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Forceful destruction successful, exit code 0 [2021-11-20 23:26:24,728 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30,30 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73fd7ef1-177b-4e6a-8abd-c8718fa70b47/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:26:24,728 INFO L402 AbstractCegarLoop]: === Iteration 32 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:26:24,728 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:26:24,729 INFO L85 PathProgramCache]: Analyzing trace with hash -1982713755, now seen corresponding path program 30 times [2021-11-20 23:26:24,729 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:26:24,729 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [237340665] [2021-11-20 23:26:24,729 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:26:24,729 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:26:25,253 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:26:37,088 INFO L134 CoverageAnalysis]: Checked inductivity of 462 backedges. 16 proven. 446 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:26:37,088 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:26:37,088 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [237340665] [2021-11-20 23:26:37,089 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [237340665] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:26:37,089 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1701962668] [2021-11-20 23:26:37,089 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-20 23:26:37,089 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:26:37,089 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73fd7ef1-177b-4e6a-8abd-c8718fa70b47/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:26:37,090 INFO L229 MonitoredProcess]: Starting monitored process 31 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73fd7ef1-177b-4e6a-8abd-c8718fa70b47/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:26:37,090 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73fd7ef1-177b-4e6a-8abd-c8718fa70b47/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Waiting until timeout for monitored process [2021-11-20 23:26:37,272 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-20 23:26:37,272 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:26:37,277 WARN L261 TraceCheckSpWp]: Trace formula consists of 371 conjuncts, 271 conjunts are in the unsatisfiable core [2021-11-20 23:26:37,281 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:26:50,856 INFO L134 CoverageAnalysis]: Checked inductivity of 462 backedges. 0 proven. 396 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2021-11-20 23:26:50,857 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:27:22,025 WARN L227 SmtUtils]: Spent 5.27s on a formula simplification. DAG size of input: 981 DAG size of output: 541 (called from [L 351] de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.arrays.Elim1Store.elim1) [2021-11-20 23:27:22,028 INFO L354 Elim1Store]: treesize reduction 2082, result has 38.8 percent of original size [2021-11-20 23:27:22,028 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 22 select indices, 22 select index equivalence classes, 0 disjoint index pairs (out of 231 index pairs), introduced 22 new quantified variables, introduced 231 case distinctions, treesize of input 189 treesize of output 1348 [2021-11-20 23:27:50,452 INFO L354 Elim1Store]: treesize reduction 3358, result has 1.3 percent of original size [2021-11-20 23:27:50,452 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 22 select indices, 22 select index equivalence classes, 0 disjoint index pairs (out of 231 index pairs), introduced 22 new quantified variables, introduced 231 case distinctions, treesize of input 188 treesize of output 71 [2021-11-20 23:27:50,765 INFO L134 CoverageAnalysis]: Checked inductivity of 462 backedges. 0 proven. 396 refuted. 0 times theorem prover too weak. 66 trivial. 0 not checked. [2021-11-20 23:27:50,766 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1701962668] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:27:50,766 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [575620439] [2021-11-20 23:27:50,767 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2021-11-20 23:27:50,767 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:27:50,768 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:27:50,768 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:27:50,768 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:27:50,812 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:27:50,836 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-20 23:27:50,836 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-20 23:27:50,871 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:27:50,872 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 32 [2021-11-20 23:27:50,944 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:27:50,944 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 39 treesize of output 41 [2021-11-20 23:27:51,013 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:27:51,015 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:27:51,017 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:27:51,028 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-20 23:27:51,028 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 240 treesize of output 228 [2021-11-20 23:27:51,196 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 21 [2021-11-20 23:27:51,981 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:27:53,630 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:27:53,630 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:27:53,631 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [87, 72, 73] total 199 [2021-11-20 23:27:53,631 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1094072633] [2021-11-20 23:27:53,631 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:27:53,631 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 199 states [2021-11-20 23:27:53,631 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:27:53,632 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 199 interpolants. [2021-11-20 23:27:53,633 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=774, Invalid=40638, Unknown=0, NotChecked=0, Total=41412 [2021-11-20 23:27:53,634 INFO L87 Difference]: Start difference. First operand 89 states and 95 transitions. Second operand has 199 states, 199 states have (on average 1.0804020100502512) internal successors, (215), 199 states have internal predecessors, (215), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:28:44,036 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:28:44,036 INFO L93 Difference]: Finished difference Result 212 states and 232 transitions. [2021-11-20 23:28:44,037 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 128 states. [2021-11-20 23:28:44,037 INFO L78 Accepts]: Start accepts. Automaton has has 199 states, 199 states have (on average 1.0804020100502512) internal successors, (215), 199 states have internal predecessors, (215), 0 states have call successors, (0), 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 88 [2021-11-20 23:28:44,037 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:28:44,038 INFO L225 Difference]: With dead ends: 212 [2021-11-20 23:28:44,038 INFO L226 Difference]: Without dead ends: 209 [2021-11-20 23:28:44,041 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 442 GetRequests, 120 SyntacticMatches, 27 SemanticMatches, 295 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20329 ImplicationChecksByTransitivity, 84.4s TimeCoverageRelationStatistics Valid=2989, Invalid=84923, Unknown=0, NotChecked=0, Total=87912 [2021-11-20 23:28:44,042 INFO L933 BasicCegarLoop]: 5 mSDtfsCounter, 15 mSDsluCounter, 481 mSDsCounter, 0 mSdLazyCounter, 11202 mSolverCounterSat, 403 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 11.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 15 SdHoareTripleChecker+Valid, 481 SdHoareTripleChecker+Invalid, 11605 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 403 IncrementalHoareTripleChecker+Valid, 11202 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 12.9s IncrementalHoareTripleChecker+Time [2021-11-20 23:28:44,042 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [15 Valid, 481 Invalid, 11605 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [403 Valid, 11202 Invalid, 0 Unknown, 0 Unchecked, 12.9s Time] [2021-11-20 23:28:44,043 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 209 states. [2021-11-20 23:28:44,115 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 209 to 127. [2021-11-20 23:28:44,116 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 127 states, 126 states have (on average 1.0873015873015872) internal successors, (137), 126 states have internal predecessors, (137), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:28:44,116 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 127 states to 127 states and 137 transitions. [2021-11-20 23:28:44,116 INFO L78 Accepts]: Start accepts. Automaton has 127 states and 137 transitions. Word has length 88 [2021-11-20 23:28:44,117 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:28:44,117 INFO L470 AbstractCegarLoop]: Abstraction has 127 states and 137 transitions. [2021-11-20 23:28:44,117 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 199 states, 199 states have (on average 1.0804020100502512) internal successors, (215), 199 states have internal predecessors, (215), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:28:44,117 INFO L276 IsEmpty]: Start isEmpty. Operand 127 states and 137 transitions. [2021-11-20 23:28:44,118 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 90 [2021-11-20 23:28:44,118 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:28:44,118 INFO L514 BasicCegarLoop]: trace histogram [12, 11, 11, 11, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:28:44,141 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73fd7ef1-177b-4e6a-8abd-c8718fa70b47/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Forceful destruction successful, exit code 0 [2021-11-20 23:28:44,322 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31,31 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73fd7ef1-177b-4e6a-8abd-c8718fa70b47/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:28:44,322 INFO L402 AbstractCegarLoop]: === Iteration 33 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:28:44,322 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:28:44,322 INFO L85 PathProgramCache]: Analyzing trace with hash 1117931377, now seen corresponding path program 31 times [2021-11-20 23:28:44,322 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:28:44,323 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1073580681] [2021-11-20 23:28:44,323 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:28:44,323 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:28:44,355 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:28:44,639 INFO L134 CoverageAnalysis]: Checked inductivity of 474 backedges. 67 proven. 77 refuted. 0 times theorem prover too weak. 330 trivial. 0 not checked. [2021-11-20 23:28:44,639 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:28:44,640 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1073580681] [2021-11-20 23:28:44,640 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1073580681] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:28:44,640 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [478041021] [2021-11-20 23:28:44,640 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-20 23:28:44,640 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:28:44,640 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73fd7ef1-177b-4e6a-8abd-c8718fa70b47/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:28:44,644 INFO L229 MonitoredProcess]: Starting monitored process 32 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73fd7ef1-177b-4e6a-8abd-c8718fa70b47/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:28:44,667 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73fd7ef1-177b-4e6a-8abd-c8718fa70b47/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Waiting until timeout for monitored process [2021-11-20 23:28:44,757 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:28:44,760 INFO L263 TraceCheckSpWp]: Trace formula consists of 467 conjuncts, 26 conjunts are in the unsatisfiable core [2021-11-20 23:28:44,762 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:28:45,298 INFO L134 CoverageAnalysis]: Checked inductivity of 474 backedges. 78 proven. 66 refuted. 0 times theorem prover too weak. 330 trivial. 0 not checked. [2021-11-20 23:28:45,298 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:28:45,542 INFO L134 CoverageAnalysis]: Checked inductivity of 474 backedges. 78 proven. 66 refuted. 0 times theorem prover too weak. 330 trivial. 0 not checked. [2021-11-20 23:28:45,543 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [478041021] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:28:45,543 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1614152777] [2021-11-20 23:28:45,545 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2021-11-20 23:28:45,545 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:28:45,545 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:28:45,546 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:28:45,546 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:28:45,591 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:28:45,609 INFO L354 Elim1Store]: treesize reduction 24, result has 44.2 percent of original size [2021-11-20 23:28:45,609 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 5 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 24 treesize of output 40 [2021-11-20 23:28:45,638 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:28:45,658 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-20 23:28:45,658 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-20 23:28:45,718 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:28:45,719 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 39 treesize of output 41 [2021-11-20 23:28:45,801 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:28:45,803 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:28:45,804 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:28:45,815 INFO L354 Elim1Store]: treesize reduction 52, result has 11.9 percent of original size [2021-11-20 23:28:45,816 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 4 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 240 treesize of output 228 [2021-11-20 23:28:46,006 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 21 [2021-11-20 23:28:46,862 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:28:47,139 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:28:47,139 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:28:47,139 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27, 27] total 41 [2021-11-20 23:28:47,140 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1861883122] [2021-11-20 23:28:47,140 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:28:47,140 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 41 states [2021-11-20 23:28:47,140 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:28:47,141 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2021-11-20 23:28:47,141 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=419, Invalid=1651, Unknown=0, NotChecked=0, Total=2070 [2021-11-20 23:28:47,141 INFO L87 Difference]: Start difference. First operand 127 states and 137 transitions. Second operand has 41 states, 41 states have (on average 1.3658536585365855) internal successors, (56), 41 states have internal predecessors, (56), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:28:47,832 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:28:47,832 INFO L93 Difference]: Finished difference Result 302 states and 327 transitions. [2021-11-20 23:28:47,832 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-11-20 23:28:47,832 INFO L78 Accepts]: Start accepts. Automaton has has 41 states, 41 states have (on average 1.3658536585365855) internal successors, (56), 41 states have internal predecessors, (56), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 89 [2021-11-20 23:28:47,833 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:28:47,833 INFO L225 Difference]: With dead ends: 302 [2021-11-20 23:28:47,834 INFO L226 Difference]: Without dead ends: 128 [2021-11-20 23:28:47,834 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 304 GetRequests, 248 SyntacticMatches, 0 SemanticMatches, 56 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 806 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=679, Invalid=2627, Unknown=0, NotChecked=0, Total=3306 [2021-11-20 23:28:47,835 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 5 mSDsluCounter, 38 mSDsCounter, 0 mSdLazyCounter, 876 mSolverCounterSat, 145 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 23 SdHoareTripleChecker+Invalid, 1021 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 145 IncrementalHoareTripleChecker+Valid, 876 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-20 23:28:47,835 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [5 Valid, 23 Invalid, 1021 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [145 Valid, 876 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-20 23:28:47,836 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 128 states. [2021-11-20 23:28:47,912 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 128 to 128. [2021-11-20 23:28:47,912 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 128 states, 127 states have (on average 1.0866141732283465) internal successors, (138), 127 states have internal predecessors, (138), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:28:47,913 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 128 states to 128 states and 138 transitions. [2021-11-20 23:28:47,913 INFO L78 Accepts]: Start accepts. Automaton has 128 states and 138 transitions. Word has length 89 [2021-11-20 23:28:47,913 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:28:47,913 INFO L470 AbstractCegarLoop]: Abstraction has 128 states and 138 transitions. [2021-11-20 23:28:47,913 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 41 states, 41 states have (on average 1.3658536585365855) internal successors, (56), 41 states have internal predecessors, (56), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:28:47,913 INFO L276 IsEmpty]: Start isEmpty. Operand 128 states and 138 transitions. [2021-11-20 23:28:47,913 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 91 [2021-11-20 23:28:47,914 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:28:47,914 INFO L514 BasicCegarLoop]: trace histogram [12, 12, 11, 11, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:28:47,937 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73fd7ef1-177b-4e6a-8abd-c8718fa70b47/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Forceful destruction successful, exit code 0 [2021-11-20 23:28:48,114 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32,32 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73fd7ef1-177b-4e6a-8abd-c8718fa70b47/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:28:48,114 INFO L402 AbstractCegarLoop]: === Iteration 34 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:28:48,114 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:28:48,115 INFO L85 PathProgramCache]: Analyzing trace with hash -1309228194, now seen corresponding path program 32 times [2021-11-20 23:28:48,115 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:28:48,115 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1972098794] [2021-11-20 23:28:48,115 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:28:48,115 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:28:48,145 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:28:48,467 INFO L134 CoverageAnalysis]: Checked inductivity of 486 backedges. 55 proven. 89 refuted. 0 times theorem prover too weak. 342 trivial. 0 not checked. [2021-11-20 23:28:48,467 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:28:48,467 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1972098794] [2021-11-20 23:28:48,467 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1972098794] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:28:48,467 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1369714097] [2021-11-20 23:28:48,468 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-20 23:28:48,468 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:28:48,468 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73fd7ef1-177b-4e6a-8abd-c8718fa70b47/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:28:48,469 INFO L229 MonitoredProcess]: Starting monitored process 33 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73fd7ef1-177b-4e6a-8abd-c8718fa70b47/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:28:48,494 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73fd7ef1-177b-4e6a-8abd-c8718fa70b47/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Waiting until timeout for monitored process [2021-11-20 23:28:48,658 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2021-11-20 23:28:48,658 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:28:48,663 INFO L263 TraceCheckSpWp]: Trace formula consists of 473 conjuncts, 26 conjunts are in the unsatisfiable core [2021-11-20 23:28:48,666 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:28:49,066 INFO L134 CoverageAnalysis]: Checked inductivity of 486 backedges. 66 proven. 78 refuted. 0 times theorem prover too weak. 342 trivial. 0 not checked. [2021-11-20 23:28:49,066 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:28:49,243 INFO L134 CoverageAnalysis]: Checked inductivity of 486 backedges. 66 proven. 78 refuted. 0 times theorem prover too weak. 342 trivial. 0 not checked. [2021-11-20 23:28:49,243 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1369714097] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:28:49,244 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [969083948] [2021-11-20 23:28:49,245 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2021-11-20 23:28:49,245 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:28:49,245 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:28:49,245 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:28:49,245 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:28:49,286 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:28:49,306 INFO L354 Elim1Store]: treesize reduction 36, result has 34.5 percent of original size [2021-11-20 23:28:49,306 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 5 select indices, 5 select index equivalence classes, 8 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 4 case distinctions, treesize of input 32 treesize of output 49 [2021-11-20 23:28:49,341 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:28:49,342 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 7 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 32 [2021-11-20 23:28:49,380 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:28:49,381 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 4 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 34 treesize of output 36 [2021-11-20 23:28:49,478 INFO L190 IndexEqualityManager]: detected not equals via solver [2021-11-20 23:28:49,479 INFO L173 IndexEqualityManager]: detected equality via solver [2021-11-20 23:28:49,497 INFO L354 Elim1Store]: treesize reduction 62, result has 25.3 percent of original size [2021-11-20 23:28:49,498 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 230 treesize of output 229 [2021-11-20 23:28:49,797 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 21 [2021-11-20 23:28:50,597 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:28:50,783 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:28:50,783 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:28:50,783 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27, 27] total 41 [2021-11-20 23:28:50,784 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1112086762] [2021-11-20 23:28:50,784 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:28:50,784 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 41 states [2021-11-20 23:28:50,784 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:28:50,785 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2021-11-20 23:28:50,785 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=407, Invalid=1663, Unknown=0, NotChecked=0, Total=2070 [2021-11-20 23:28:50,785 INFO L87 Difference]: Start difference. First operand 128 states and 138 transitions. Second operand has 41 states, 41 states have (on average 1.6829268292682926) internal successors, (69), 41 states have internal predecessors, (69), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:28:51,266 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:28:51,266 INFO L93 Difference]: Finished difference Result 197 states and 217 transitions. [2021-11-20 23:28:51,276 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2021-11-20 23:28:51,276 INFO L78 Accepts]: Start accepts. Automaton has has 41 states, 41 states have (on average 1.6829268292682926) internal successors, (69), 41 states have internal predecessors, (69), 0 states have call successors, (0), 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 90 [2021-11-20 23:28:51,277 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:28:51,277 INFO L225 Difference]: With dead ends: 197 [2021-11-20 23:28:51,277 INFO L226 Difference]: Without dead ends: 96 [2021-11-20 23:28:51,278 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 308 GetRequests, 249 SyntacticMatches, 2 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1071 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=837, Invalid=2585, Unknown=0, NotChecked=0, Total=3422 [2021-11-20 23:28:51,279 INFO L933 BasicCegarLoop]: 3 mSDtfsCounter, 53 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 279 mSolverCounterSat, 433 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 53 SdHoareTripleChecker+Valid, 15 SdHoareTripleChecker+Invalid, 712 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 433 IncrementalHoareTripleChecker+Valid, 279 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-20 23:28:51,279 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [53 Valid, 15 Invalid, 712 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [433 Valid, 279 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-20 23:28:51,280 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2021-11-20 23:28:51,363 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 96. [2021-11-20 23:28:51,364 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 96 states, 95 states have (on average 1.0736842105263158) internal successors, (102), 95 states have internal predecessors, (102), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:28:51,364 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 96 states to 96 states and 102 transitions. [2021-11-20 23:28:51,364 INFO L78 Accepts]: Start accepts. Automaton has 96 states and 102 transitions. Word has length 90 [2021-11-20 23:28:51,364 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:28:51,365 INFO L470 AbstractCegarLoop]: Abstraction has 96 states and 102 transitions. [2021-11-20 23:28:51,365 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 41 states, 41 states have (on average 1.6829268292682926) internal successors, (69), 41 states have internal predecessors, (69), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:28:51,365 INFO L276 IsEmpty]: Start isEmpty. Operand 96 states and 102 transitions. [2021-11-20 23:28:51,365 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 96 [2021-11-20 23:28:51,365 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:28:51,366 INFO L514 BasicCegarLoop]: trace histogram [12, 12, 12, 12, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:28:51,387 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73fd7ef1-177b-4e6a-8abd-c8718fa70b47/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Forceful destruction successful, exit code 0 [2021-11-20 23:28:51,566 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 33 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73fd7ef1-177b-4e6a-8abd-c8718fa70b47/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable33 [2021-11-20 23:28:51,566 INFO L402 AbstractCegarLoop]: === Iteration 35 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:28:51,567 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:28:51,567 INFO L85 PathProgramCache]: Analyzing trace with hash 290131534, now seen corresponding path program 33 times [2021-11-20 23:28:51,567 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:28:51,567 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [708799618] [2021-11-20 23:28:51,567 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:28:51,567 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:28:52,128 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:29:04,659 INFO L134 CoverageAnalysis]: Checked inductivity of 546 backedges. 66 proven. 480 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:29:04,659 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:29:04,659 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [708799618] [2021-11-20 23:29:04,659 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [708799618] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:29:04,659 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [188644517] [2021-11-20 23:29:04,659 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-20 23:29:04,659 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:29:04,659 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73fd7ef1-177b-4e6a-8abd-c8718fa70b47/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:29:04,660 INFO L229 MonitoredProcess]: Starting monitored process 34 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73fd7ef1-177b-4e6a-8abd-c8718fa70b47/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:29:04,661 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_73fd7ef1-177b-4e6a-8abd-c8718fa70b47/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Waiting until timeout for monitored process [2021-11-20 23:29:04,833 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-20 23:29:04,834 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:29:04,839 WARN L261 TraceCheckSpWp]: Trace formula consists of 401 conjuncts, 295 conjunts are in the unsatisfiable core [2021-11-20 23:29:04,843 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:29:19,132 INFO L134 CoverageAnalysis]: Checked inductivity of 546 backedges. 0 proven. 468 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2021-11-20 23:29:19,132 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:29:59,931 WARN L227 SmtUtils]: Spent 7.54s on a formula simplification. DAG size of input: 1166 DAG size of output: 638 (called from [L 351] de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.arrays.Elim1Store.elim1) [2021-11-20 23:29:59,933 INFO L354 Elim1Store]: treesize reduction 2499, result has 38.6 percent of original size [2021-11-20 23:29:59,934 INFO L388 Elim1Store]: Elim1 did not use preprocessing eliminated variable of array dimension 2, 0 stores, 24 select indices, 24 select index equivalence classes, 0 disjoint index pairs (out of 276 index pairs), introduced 24 new quantified variables, introduced 276 case distinctions, treesize of input 206 treesize of output 1602