./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/loop-invgen/fragtest_simple.i --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_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/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_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/config/TaipanReach.xml -i ../../sv-benchmarks/c/loop-invgen/fragtest_simple.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/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_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/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 be3b53cc5f9badbf5402cafcfa5766831674eb009261bc7c1bcbe9580aece38e --- Real Ultimate output --- This is Ultimate 0.2.1-dev-53f42b1 [2021-11-20 23:19:15,254 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-20 23:19:15,257 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-20 23:19:15,322 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-20 23:19:15,323 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-20 23:19:15,329 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-20 23:19:15,331 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-20 23:19:15,335 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-20 23:19:15,338 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-20 23:19:15,344 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-20 23:19:15,345 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-20 23:19:15,347 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-20 23:19:15,348 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-20 23:19:15,351 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-20 23:19:15,353 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-20 23:19:15,359 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-20 23:19:15,362 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-20 23:19:15,363 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-20 23:19:15,366 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-20 23:19:15,374 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-20 23:19:15,376 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-20 23:19:15,377 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-20 23:19:15,379 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-20 23:19:15,380 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-20 23:19:15,384 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-20 23:19:15,384 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-20 23:19:15,385 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-20 23:19:15,386 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-20 23:19:15,386 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-20 23:19:15,388 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-20 23:19:15,388 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-20 23:19:15,389 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-20 23:19:15,390 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-20 23:19:15,391 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-20 23:19:15,392 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-20 23:19:15,393 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-20 23:19:15,393 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-20 23:19:15,394 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-20 23:19:15,394 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-20 23:19:15,395 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-20 23:19:15,396 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-20 23:19:15,397 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-20 23:19:15,423 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-20 23:19:15,427 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-20 23:19:15,428 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-20 23:19:15,428 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-20 23:19:15,430 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-20 23:19:15,437 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-20 23:19:15,437 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-20 23:19:15,437 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-20 23:19:15,438 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-20 23:19:15,438 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-20 23:19:15,439 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-20 23:19:15,439 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-20 23:19:15,440 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-20 23:19:15,440 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-20 23:19:15,440 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-20 23:19:15,440 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-20 23:19:15,441 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-20 23:19:15,441 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-20 23:19:15,442 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-20 23:19:15,443 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-20 23:19:15,443 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-20 23:19:15,443 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-20 23:19:15,443 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-20 23:19:15,444 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-20 23:19:15,444 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-20 23:19:15,444 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-20 23:19:15,446 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-20 23:19:15,446 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-20 23:19:15,446 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-20 23:19:15,446 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-20 23:19:15,447 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-20 23:19:15,447 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-20 23:19:15,447 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-20 23:19:15,448 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-20 23:19:15,448 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-20 23:19:15,448 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-20 23:19:15,448 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-20 23:19:15,448 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-20 23:19:15,449 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-20 23:19:15,449 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-20 23:19:15,449 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-20 23:19:15,449 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_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> be3b53cc5f9badbf5402cafcfa5766831674eb009261bc7c1bcbe9580aece38e [2021-11-20 23:19:15,808 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-20 23:19:15,829 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-20 23:19:15,831 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-20 23:19:15,832 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-20 23:19:15,833 INFO L275 PluginConnector]: CDTParser initialized [2021-11-20 23:19:15,834 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/../../sv-benchmarks/c/loop-invgen/fragtest_simple.i [2021-11-20 23:19:15,904 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/data/19b638c95/9eb6775a0b844d318cf387d5ec74c47a/FLAGcc57e061b [2021-11-20 23:19:16,389 INFO L306 CDTParser]: Found 1 translation units. [2021-11-20 23:19:16,390 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/sv-benchmarks/c/loop-invgen/fragtest_simple.i [2021-11-20 23:19:16,409 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/data/19b638c95/9eb6775a0b844d318cf387d5ec74c47a/FLAGcc57e061b [2021-11-20 23:19:16,767 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/data/19b638c95/9eb6775a0b844d318cf387d5ec74c47a [2021-11-20 23:19:16,771 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-20 23:19:16,775 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-20 23:19:16,781 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-20 23:19:16,782 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-20 23:19:16,786 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-20 23:19:16,787 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.11 11:19:16" (1/1) ... [2021-11-20 23:19:16,789 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@7ac39ddf and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:19:16, skipping insertion in model container [2021-11-20 23:19:16,790 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 20.11 11:19:16" (1/1) ... [2021-11-20 23:19:16,799 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-20 23:19:16,820 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-20 23:19:17,084 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_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/sv-benchmarks/c/loop-invgen/fragtest_simple.i[893,906] [2021-11-20 23:19:17,107 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-20 23:19:17,117 INFO L203 MainTranslator]: Completed pre-run [2021-11-20 23:19:17,138 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_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/sv-benchmarks/c/loop-invgen/fragtest_simple.i[893,906] [2021-11-20 23:19:17,151 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-20 23:19:17,176 INFO L208 MainTranslator]: Completed translation [2021-11-20 23:19:17,177 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:19:17 WrapperNode [2021-11-20 23:19:17,177 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-20 23:19:17,178 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-20 23:19:17,179 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-20 23:19:17,179 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-20 23:19:17,188 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:19:17" (1/1) ... [2021-11-20 23:19:17,197 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:19:17" (1/1) ... [2021-11-20 23:19:17,224 INFO L137 Inliner]: procedures = 16, calls = 7, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 59 [2021-11-20 23:19:17,225 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-20 23:19:17,226 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-20 23:19:17,226 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-20 23:19:17,226 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-20 23:19:17,237 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:19:17" (1/1) ... [2021-11-20 23:19:17,237 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:19:17" (1/1) ... [2021-11-20 23:19:17,247 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:19:17" (1/1) ... [2021-11-20 23:19:17,247 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:19:17" (1/1) ... [2021-11-20 23:19:17,250 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:19:17" (1/1) ... [2021-11-20 23:19:17,256 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:19:17" (1/1) ... [2021-11-20 23:19:17,263 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:19:17" (1/1) ... [2021-11-20 23:19:17,265 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-20 23:19:17,272 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-20 23:19:17,273 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-20 23:19:17,273 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-20 23:19:17,274 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:19:17" (1/1) ... [2021-11-20 23:19:17,280 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-20 23:19:17,291 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:19:17,302 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-20 23:19:17,310 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-20 23:19:17,349 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-20 23:19:17,349 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-20 23:19:17,349 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-20 23:19:17,349 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-20 23:19:17,430 INFO L236 CfgBuilder]: Building ICFG [2021-11-20 23:19:17,432 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-20 23:19:17,644 INFO L277 CfgBuilder]: Performing block encoding [2021-11-20 23:19:17,664 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-20 23:19:17,664 INFO L301 CfgBuilder]: Removed 3 assume(true) statements. [2021-11-20 23:19:17,667 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.11 11:19:17 BoogieIcfgContainer [2021-11-20 23:19:17,667 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-20 23:19:17,669 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-20 23:19:17,669 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-20 23:19:17,673 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-20 23:19:17,673 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 20.11 11:19:16" (1/3) ... [2021-11-20 23:19:17,674 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6899a67a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.11 11:19:17, skipping insertion in model container [2021-11-20 23:19:17,674 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 20.11 11:19:17" (2/3) ... [2021-11-20 23:19:17,675 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6899a67a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 20.11 11:19:17, skipping insertion in model container [2021-11-20 23:19:17,675 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 20.11 11:19:17" (3/3) ... [2021-11-20 23:19:17,676 INFO L111 eAbstractionObserver]: Analyzing ICFG fragtest_simple.i [2021-11-20 23:19:17,682 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-20 23:19:17,683 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-20 23:19:17,790 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-20 23:19:17,817 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 23:19:17,818 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-20 23:19:17,834 INFO L276 IsEmpty]: Start isEmpty. Operand has 15 states, 13 states have (on average 1.6153846153846154) internal successors, (21), 14 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:19:17,841 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2021-11-20 23:19:17,849 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:19:17,849 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:19:17,850 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:19:17,856 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:19:17,857 INFO L85 PathProgramCache]: Analyzing trace with hash 1621408492, now seen corresponding path program 1 times [2021-11-20 23:19:17,868 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:19:17,869 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [753005893] [2021-11-20 23:19:17,869 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:19:17,870 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:19:17,991 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:19:18,063 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 23:19:18,064 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:19:18,064 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [753005893] [2021-11-20 23:19:18,066 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [753005893] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:19:18,066 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 23:19:18,066 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-20 23:19:18,069 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1058374786] [2021-11-20 23:19:18,070 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:19:18,076 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2021-11-20 23:19:18,076 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:19:18,121 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2021-11-20 23:19:18,123 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-11-20 23:19:18,126 INFO L87 Difference]: Start difference. First operand has 15 states, 13 states have (on average 1.6153846153846154) internal successors, (21), 14 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 2 states, 2 states have (on average 4.0) internal successors, (8), 2 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:19:18,171 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:19:18,171 INFO L93 Difference]: Finished difference Result 27 states and 37 transitions. [2021-11-20 23:19:18,174 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2021-11-20 23:19:18,175 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 4.0) internal successors, (8), 2 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 8 [2021-11-20 23:19:18,176 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:19:18,183 INFO L225 Difference]: With dead ends: 27 [2021-11-20 23:19:18,184 INFO L226 Difference]: Without dead ends: 13 [2021-11-20 23:19:18,187 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2021-11-20 23:19:18,196 INFO L933 BasicCegarLoop]: 14 mSDtfsCounter, 0 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 3 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 14 SdHoareTripleChecker+Invalid, 4 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 3 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-20 23:19:18,198 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [0 Valid, 14 Invalid, 4 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 3 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-20 23:19:18,219 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2021-11-20 23:19:18,238 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2021-11-20 23:19:18,240 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 13 states, 12 states have (on average 1.25) internal successors, (15), 12 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:19:18,241 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 15 transitions. [2021-11-20 23:19:18,243 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 15 transitions. Word has length 8 [2021-11-20 23:19:18,243 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:19:18,244 INFO L470 AbstractCegarLoop]: Abstraction has 13 states and 15 transitions. [2021-11-20 23:19:18,244 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 4.0) internal successors, (8), 2 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:19:18,244 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 15 transitions. [2021-11-20 23:19:18,245 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2021-11-20 23:19:18,245 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:19:18,246 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:19:18,246 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-20 23:19:18,248 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:19:18,255 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:19:18,255 INFO L85 PathProgramCache]: Analyzing trace with hash -134467088, now seen corresponding path program 1 times [2021-11-20 23:19:18,256 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:19:18,256 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [94493622] [2021-11-20 23:19:18,257 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:19:18,257 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:19:18,326 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:19:18,480 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 23:19:18,480 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:19:18,480 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [94493622] [2021-11-20 23:19:18,480 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [94493622] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:19:18,481 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 23:19:18,481 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-20 23:19:18,481 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1317747078] [2021-11-20 23:19:18,481 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:19:18,483 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-20 23:19:18,483 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:19:18,484 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-20 23:19:18,484 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-20 23:19:18,484 INFO L87 Difference]: Start difference. First operand 13 states and 15 transitions. Second operand has 4 states, 4 states have (on average 2.5) internal successors, (10), 3 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:19:18,516 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:19:18,516 INFO L93 Difference]: Finished difference Result 18 states and 20 transitions. [2021-11-20 23:19:18,517 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-20 23:19:18,517 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.5) internal successors, (10), 3 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 10 [2021-11-20 23:19:18,517 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:19:18,518 INFO L225 Difference]: With dead ends: 18 [2021-11-20 23:19:18,518 INFO L226 Difference]: Without dead ends: 16 [2021-11-20 23:19:18,519 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-20 23:19:18,520 INFO L933 BasicCegarLoop]: 10 mSDtfsCounter, 6 mSDsluCounter, 13 mSDsCounter, 0 mSdLazyCounter, 13 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 21 SdHoareTripleChecker+Invalid, 16 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 13 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-20 23:19:18,521 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [6 Valid, 21 Invalid, 16 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 13 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-20 23:19:18,522 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2021-11-20 23:19:18,525 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 15. [2021-11-20 23:19:18,525 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 15 states, 14 states have (on average 1.2142857142857142) internal successors, (17), 14 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:19:18,526 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 17 transitions. [2021-11-20 23:19:18,526 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 17 transitions. Word has length 10 [2021-11-20 23:19:18,527 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:19:18,527 INFO L470 AbstractCegarLoop]: Abstraction has 15 states and 17 transitions. [2021-11-20 23:19:18,531 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 2.5) internal successors, (10), 3 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:19:18,531 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 17 transitions. [2021-11-20 23:19:18,532 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2021-11-20 23:19:18,534 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:19:18,534 INFO L514 BasicCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:19:18,534 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-11-20 23:19:18,535 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:19:18,535 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:19:18,536 INFO L85 PathProgramCache]: Analyzing trace with hash 1655368611, now seen corresponding path program 1 times [2021-11-20 23:19:18,536 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:19:18,536 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [434910746] [2021-11-20 23:19:18,536 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:19:18,536 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:19:18,550 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:19:18,599 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:19:18,600 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:19:18,600 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [434910746] [2021-11-20 23:19:18,600 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [434910746] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-20 23:19:18,600 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-20 23:19:18,601 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2021-11-20 23:19:18,601 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [239041941] [2021-11-20 23:19:18,601 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-20 23:19:18,602 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-20 23:19:18,602 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:19:18,602 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-20 23:19:18,603 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-20 23:19:18,603 INFO L87 Difference]: Start difference. First operand 15 states and 17 transitions. Second operand has 5 states, 5 states have (on average 2.8) internal successors, (14), 5 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:19:18,650 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:19:18,651 INFO L93 Difference]: Finished difference Result 31 states and 35 transitions. [2021-11-20 23:19:18,651 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-20 23:19:18,652 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.8) internal successors, (14), 5 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 14 [2021-11-20 23:19:18,652 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:19:18,653 INFO L225 Difference]: With dead ends: 31 [2021-11-20 23:19:18,653 INFO L226 Difference]: Without dead ends: 20 [2021-11-20 23:19:18,653 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2021-11-20 23:19:18,655 INFO L933 BasicCegarLoop]: 7 mSDtfsCounter, 5 mSDsluCounter, 19 mSDsCounter, 0 mSdLazyCounter, 32 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 26 SdHoareTripleChecker+Invalid, 33 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 32 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-20 23:19:18,656 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [5 Valid, 26 Invalid, 33 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 32 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-20 23:19:18,657 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2021-11-20 23:19:18,660 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 17. [2021-11-20 23:19:18,661 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17 states, 16 states have (on average 1.1875) internal successors, (19), 16 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 23:19:18,662 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 19 transitions. [2021-11-20 23:19:18,662 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 19 transitions. Word has length 14 [2021-11-20 23:19:18,662 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:19:18,662 INFO L470 AbstractCegarLoop]: Abstraction has 17 states and 19 transitions. [2021-11-20 23:19:18,663 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 2.8) internal successors, (14), 5 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:19:18,663 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 19 transitions. [2021-11-20 23:19:18,663 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2021-11-20 23:19:18,664 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:19:18,664 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:19:18,664 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-11-20 23:19:18,664 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:19:18,665 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:19:18,665 INFO L85 PathProgramCache]: Analyzing trace with hash 233966664, now seen corresponding path program 1 times [2021-11-20 23:19:18,666 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:19:18,666 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1445289309] [2021-11-20 23:19:18,666 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:19:18,683 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:19:18,716 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:19:18,807 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:19:18,807 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:19:18,807 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1445289309] [2021-11-20 23:19:18,808 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1445289309] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:19:18,808 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [95823040] [2021-11-20 23:19:18,808 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:19:18,809 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:19:18,809 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:19:18,811 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:19:18,830 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-20 23:19:18,868 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:19:18,870 INFO L263 TraceCheckSpWp]: Trace formula consists of 69 conjuncts, 6 conjunts are in the unsatisfiable core [2021-11-20 23:19:18,875 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:19:19,063 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:19:19,063 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:19:19,195 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:19:19,196 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [95823040] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:19:19,196 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2084502344] [2021-11-20 23:19:19,220 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-20 23:19:19,220 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:19:19,226 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:19:19,238 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:19:19,239 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:19:22,087 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:19:22,485 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:19:22,486 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:19:22,486 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 6, 6] total 12 [2021-11-20 23:19:22,486 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1531512348] [2021-11-20 23:19:22,486 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:19:22,487 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2021-11-20 23:19:22,487 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:19:22,488 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-11-20 23:19:22,489 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=352, Unknown=0, NotChecked=0, Total=420 [2021-11-20 23:19:22,489 INFO L87 Difference]: Start difference. First operand 17 states and 19 transitions. Second operand has 12 states, 12 states have (on average 3.0) internal successors, (36), 12 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:19:22,730 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:19:22,731 INFO L93 Difference]: Finished difference Result 41 states and 47 transitions. [2021-11-20 23:19:22,731 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2021-11-20 23:19:22,731 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 3.0) internal successors, (36), 12 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 16 [2021-11-20 23:19:22,731 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:19:22,732 INFO L225 Difference]: With dead ends: 41 [2021-11-20 23:19:22,732 INFO L226 Difference]: Without dead ends: 30 [2021-11-20 23:19:22,734 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 34 SyntacticMatches, 0 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 166 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=131, Invalid=681, Unknown=0, NotChecked=0, Total=812 [2021-11-20 23:19:22,735 INFO L933 BasicCegarLoop]: 6 mSDtfsCounter, 36 mSDsluCounter, 36 mSDsCounter, 0 mSdLazyCounter, 94 mSolverCounterSat, 27 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 36 SdHoareTripleChecker+Valid, 41 SdHoareTripleChecker+Invalid, 121 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 27 IncrementalHoareTripleChecker+Valid, 94 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-20 23:19:22,736 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [36 Valid, 41 Invalid, 121 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [27 Valid, 94 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-20 23:19:22,737 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 30 states. [2021-11-20 23:19:22,741 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 30 to 23. [2021-11-20 23:19:22,741 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23 states, 22 states have (on average 1.1363636363636365) internal successors, (25), 22 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 23:19:22,742 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 25 transitions. [2021-11-20 23:19:22,742 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 25 transitions. Word has length 16 [2021-11-20 23:19:22,742 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:19:22,742 INFO L470 AbstractCegarLoop]: Abstraction has 23 states and 25 transitions. [2021-11-20 23:19:22,743 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 3.0) internal successors, (36), 12 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:19:22,743 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 25 transitions. [2021-11-20 23:19:22,744 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2021-11-20 23:19:22,744 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:19:22,744 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:19:22,791 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-20 23:19:22,971 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:19:22,971 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:19:22,972 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:19:22,972 INFO L85 PathProgramCache]: Analyzing trace with hash 885992160, now seen corresponding path program 2 times [2021-11-20 23:19:22,972 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:19:22,972 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1771053111] [2021-11-20 23:19:22,972 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:19:22,973 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:19:23,004 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:19:23,096 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 2 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:19:23,097 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:19:23,100 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1771053111] [2021-11-20 23:19:23,101 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1771053111] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:19:23,101 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2049466142] [2021-11-20 23:19:23,102 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-20 23:19:23,103 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:19:23,104 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:19:23,110 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:19:23,142 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-20 23:19:23,190 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-11-20 23:19:23,194 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:19:23,196 INFO L263 TraceCheckSpWp]: Trace formula consists of 91 conjuncts, 8 conjunts are in the unsatisfiable core [2021-11-20 23:19:23,198 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:19:23,362 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 8 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:19:23,362 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:19:23,458 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 8 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:19:23,458 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2049466142] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:19:23,458 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1878076371] [2021-11-20 23:19:23,462 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-20 23:19:23,462 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:19:23,462 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:19:23,463 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:19:23,463 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:19:25,569 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:19:26,011 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:19:26,011 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:19:26,012 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 8, 8] total 16 [2021-11-20 23:19:26,012 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2012830122] [2021-11-20 23:19:26,012 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:19:26,013 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-20 23:19:26,013 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:19:26,014 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-20 23:19:26,014 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=89, Invalid=511, Unknown=0, NotChecked=0, Total=600 [2021-11-20 23:19:26,015 INFO L87 Difference]: Start difference. First operand 23 states and 25 transitions. Second operand has 16 states, 16 states have (on average 3.25) internal successors, (52), 16 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 23:19:26,311 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:19:26,311 INFO L93 Difference]: Finished difference Result 54 states and 61 transitions. [2021-11-20 23:19:26,312 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2021-11-20 23:19:26,312 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 3.25) internal successors, (52), 16 states have internal predecessors, (52), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 22 [2021-11-20 23:19:26,312 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:19:26,314 INFO L225 Difference]: With dead ends: 54 [2021-11-20 23:19:26,315 INFO L226 Difference]: Without dead ends: 39 [2021-11-20 23:19:26,316 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 86 GetRequests, 51 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 313 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=198, Invalid=1134, Unknown=0, NotChecked=0, Total=1332 [2021-11-20 23:19:26,317 INFO L933 BasicCegarLoop]: 6 mSDtfsCounter, 52 mSDsluCounter, 57 mSDsCounter, 0 mSdLazyCounter, 150 mSolverCounterSat, 38 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 52 SdHoareTripleChecker+Valid, 62 SdHoareTripleChecker+Invalid, 188 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 38 IncrementalHoareTripleChecker+Valid, 150 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-20 23:19:26,317 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [52 Valid, 62 Invalid, 188 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [38 Valid, 150 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-20 23:19:26,318 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2021-11-20 23:19:26,323 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 29. [2021-11-20 23:19:26,324 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29 states, 28 states have (on average 1.1071428571428572) internal successors, (31), 28 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:19:26,325 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 31 transitions. [2021-11-20 23:19:26,325 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 31 transitions. Word has length 22 [2021-11-20 23:19:26,325 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:19:26,325 INFO L470 AbstractCegarLoop]: Abstraction has 29 states and 31 transitions. [2021-11-20 23:19:26,326 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 3.25) internal successors, (52), 16 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 23:19:26,326 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 31 transitions. [2021-11-20 23:19:26,327 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-11-20 23:19:26,327 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:19:26,327 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:19:26,358 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-20 23:19:26,539 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:19:26,539 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:19:26,539 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:19:26,540 INFO L85 PathProgramCache]: Analyzing trace with hash -1367196232, now seen corresponding path program 3 times [2021-11-20 23:19:26,540 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:19:26,540 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [30202928] [2021-11-20 23:19:26,540 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:19:26,540 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:19:26,563 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:19:26,656 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 12 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:19:26,656 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:19:26,656 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [30202928] [2021-11-20 23:19:26,657 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [30202928] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:19:26,657 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [180374215] [2021-11-20 23:19:26,657 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-20 23:19:26,657 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:19:26,658 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:19:26,667 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:19:26,695 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-20 23:19:26,757 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-20 23:19:26,757 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:19:26,758 INFO L263 TraceCheckSpWp]: Trace formula consists of 113 conjuncts, 10 conjunts are in the unsatisfiable core [2021-11-20 23:19:26,760 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:19:26,888 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 12 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:19:26,888 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:19:26,988 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 12 proven. 18 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:19:26,988 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [180374215] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:19:26,989 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [667923308] [2021-11-20 23:19:26,992 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-20 23:19:26,992 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:19:26,993 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:19:26,993 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:19:26,993 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:19:28,806 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:19:29,229 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:19:29,229 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:19:29,230 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 6, 6] total 15 [2021-11-20 23:19:29,230 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1818471316] [2021-11-20 23:19:29,230 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:19:29,230 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2021-11-20 23:19:29,230 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:19:29,231 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2021-11-20 23:19:29,231 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=83, Invalid=469, Unknown=0, NotChecked=0, Total=552 [2021-11-20 23:19:29,232 INFO L87 Difference]: Start difference. First operand 29 states and 31 transitions. Second operand has 15 states, 15 states have (on average 3.6666666666666665) internal successors, (55), 15 states have internal predecessors, (55), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:19:29,603 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:19:29,604 INFO L93 Difference]: Finished difference Result 69 states and 77 transitions. [2021-11-20 23:19:29,604 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2021-11-20 23:19:29,605 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 3.6666666666666665) internal successors, (55), 15 states have internal predecessors, (55), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 28 [2021-11-20 23:19:29,605 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:19:29,606 INFO L225 Difference]: With dead ends: 69 [2021-11-20 23:19:29,606 INFO L226 Difference]: Without dead ends: 50 [2021-11-20 23:19:29,608 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 112 GetRequests, 73 SyntacticMatches, 1 SemanticMatches, 38 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 394 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=246, Invalid=1314, Unknown=0, NotChecked=0, Total=1560 [2021-11-20 23:19:29,609 INFO L933 BasicCegarLoop]: 7 mSDtfsCounter, 58 mSDsluCounter, 46 mSDsCounter, 0 mSdLazyCounter, 135 mSolverCounterSat, 48 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 58 SdHoareTripleChecker+Valid, 52 SdHoareTripleChecker+Invalid, 183 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 48 IncrementalHoareTripleChecker+Valid, 135 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-20 23:19:29,609 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [58 Valid, 52 Invalid, 183 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [48 Valid, 135 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-20 23:19:29,610 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2021-11-20 23:19:29,615 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 35. [2021-11-20 23:19:29,616 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 35 states, 34 states have (on average 1.088235294117647) internal successors, (37), 34 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:19:29,617 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 37 transitions. [2021-11-20 23:19:29,617 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 37 transitions. Word has length 28 [2021-11-20 23:19:29,617 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:19:29,618 INFO L470 AbstractCegarLoop]: Abstraction has 35 states and 37 transitions. [2021-11-20 23:19:29,618 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 15 states have (on average 3.6666666666666665) internal successors, (55), 15 states have internal predecessors, (55), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:19:29,618 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 37 transitions. [2021-11-20 23:19:29,619 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2021-11-20 23:19:29,619 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:19:29,619 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:19:29,663 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-20 23:19:29,843 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2021-11-20 23:19:29,843 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:19:29,843 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:19:29,844 INFO L85 PathProgramCache]: Analyzing trace with hash -289016624, now seen corresponding path program 4 times [2021-11-20 23:19:29,844 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:19:29,844 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [338653574] [2021-11-20 23:19:29,844 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:19:29,844 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:19:29,878 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:19:30,007 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 23 proven. 29 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:19:30,008 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:19:30,008 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [338653574] [2021-11-20 23:19:30,008 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [338653574] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:19:30,008 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [423730281] [2021-11-20 23:19:30,009 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-20 23:19:30,009 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:19:30,009 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:19:30,014 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:19:30,020 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-20 23:19:30,080 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:19:30,082 INFO L263 TraceCheckSpWp]: Trace formula consists of 135 conjuncts, 12 conjunts are in the unsatisfiable core [2021-11-20 23:19:30,084 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:19:30,352 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 32 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:19:30,352 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:19:30,444 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 32 proven. 20 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:19:30,444 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [423730281] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:19:30,445 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1651166123] [2021-11-20 23:19:30,447 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-20 23:19:30,447 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:19:30,448 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:19:30,448 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:19:30,448 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:19:32,038 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:19:32,408 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:19:32,408 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:19:32,409 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12] total 19 [2021-11-20 23:19:32,409 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1138286154] [2021-11-20 23:19:32,409 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:19:32,409 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2021-11-20 23:19:32,410 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:19:32,410 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2021-11-20 23:19:32,411 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=125, Invalid=631, Unknown=0, NotChecked=0, Total=756 [2021-11-20 23:19:32,411 INFO L87 Difference]: Start difference. First operand 35 states and 37 transitions. Second operand has 19 states, 19 states have (on average 3.0526315789473686) internal successors, (58), 19 states have internal predecessors, (58), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:19:32,598 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:19:32,599 INFO L93 Difference]: Finished difference Result 75 states and 83 transitions. [2021-11-20 23:19:32,599 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2021-11-20 23:19:32,599 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 3.0526315789473686) internal successors, (58), 19 states have internal predecessors, (58), 0 states have call successors, (0), 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 23:19:32,600 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:19:32,601 INFO L225 Difference]: With dead ends: 75 [2021-11-20 23:19:32,601 INFO L226 Difference]: Without dead ends: 52 [2021-11-20 23:19:32,602 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 117 GetRequests, 86 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 306 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=187, Invalid=869, Unknown=0, NotChecked=0, Total=1056 [2021-11-20 23:19:32,603 INFO L933 BasicCegarLoop]: 12 mSDtfsCounter, 31 mSDsluCounter, 82 mSDsCounter, 0 mSdLazyCounter, 108 mSolverCounterSat, 34 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 31 SdHoareTripleChecker+Valid, 94 SdHoareTripleChecker+Invalid, 142 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 34 IncrementalHoareTripleChecker+Valid, 108 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-20 23:19:32,604 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [31 Valid, 94 Invalid, 142 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [34 Valid, 108 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-20 23:19:32,605 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2021-11-20 23:19:32,617 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 37. [2021-11-20 23:19:32,617 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 37 states, 36 states have (on average 1.0833333333333333) internal successors, (39), 36 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 23:19:32,618 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37 states to 37 states and 39 transitions. [2021-11-20 23:19:32,618 INFO L78 Accepts]: Start accepts. Automaton has 37 states and 39 transitions. Word has length 34 [2021-11-20 23:19:32,619 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:19:32,619 INFO L470 AbstractCegarLoop]: Abstraction has 37 states and 39 transitions. [2021-11-20 23:19:32,619 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 19 states have (on average 3.0526315789473686) internal successors, (58), 19 states have internal predecessors, (58), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:19:32,619 INFO L276 IsEmpty]: Start isEmpty. Operand 37 states and 39 transitions. [2021-11-20 23:19:32,620 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2021-11-20 23:19:32,621 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:19:32,621 INFO L514 BasicCegarLoop]: trace histogram [6, 5, 5, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:19:32,670 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-20 23:19:32,838 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2021-11-20 23:19:32,839 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:19:32,839 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:19:32,839 INFO L85 PathProgramCache]: Analyzing trace with hash 1842565365, now seen corresponding path program 5 times [2021-11-20 23:19:32,839 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:19:32,840 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2095784189] [2021-11-20 23:19:32,840 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:19:32,840 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:19:32,876 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:19:33,007 INFO L134 CoverageAnalysis]: Checked inductivity of 62 backedges. 20 proven. 42 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:19:33,007 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:19:33,007 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2095784189] [2021-11-20 23:19:33,008 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2095784189] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:19:33,008 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [271234108] [2021-11-20 23:19:33,008 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-20 23:19:33,008 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:19:33,008 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:19:33,009 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:19:33,030 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-20 23:19:33,067 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2021-11-20 23:19:33,067 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:19:33,069 INFO L263 TraceCheckSpWp]: Trace formula consists of 145 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-20 23:19:33,071 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:19:33,203 INFO L134 CoverageAnalysis]: Checked inductivity of 62 backedges. 30 proven. 32 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:19:33,204 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:19:33,326 INFO L134 CoverageAnalysis]: Checked inductivity of 62 backedges. 30 proven. 32 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:19:33,326 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [271234108] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:19:33,326 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1938228665] [2021-11-20 23:19:33,329 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-20 23:19:33,329 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:19:33,330 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:19:33,330 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:19:33,330 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:19:35,104 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:19:35,416 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:19:35,417 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:19:35,417 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 11 [2021-11-20 23:19:35,417 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2071792840] [2021-11-20 23:19:35,417 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:19:35,418 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2021-11-20 23:19:35,418 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:19:35,418 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2021-11-20 23:19:35,419 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=91, Invalid=329, Unknown=0, NotChecked=0, Total=420 [2021-11-20 23:19:35,419 INFO L87 Difference]: Start difference. First operand 37 states and 39 transitions. Second operand has 12 states, 12 states have (on average 4.75) internal successors, (57), 11 states have internal predecessors, (57), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:19:35,550 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:19:35,550 INFO L93 Difference]: Finished difference Result 54 states and 57 transitions. [2021-11-20 23:19:35,551 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-11-20 23:19:35,551 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 12 states have (on average 4.75) internal successors, (57), 11 states have internal predecessors, (57), 0 states have call successors, (0), 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 36 [2021-11-20 23:19:35,551 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:19:35,552 INFO L225 Difference]: With dead ends: 54 [2021-11-20 23:19:35,552 INFO L226 Difference]: Without dead ends: 52 [2021-11-20 23:19:35,553 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 126 GetRequests, 98 SyntacticMatches, 1 SemanticMatches, 27 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 219 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=184, Invalid=628, Unknown=0, NotChecked=0, Total=812 [2021-11-20 23:19:35,554 INFO L933 BasicCegarLoop]: 14 mSDtfsCounter, 35 mSDsluCounter, 64 mSDsCounter, 0 mSdLazyCounter, 70 mSolverCounterSat, 24 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 35 SdHoareTripleChecker+Valid, 73 SdHoareTripleChecker+Invalid, 94 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 24 IncrementalHoareTripleChecker+Valid, 70 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-20 23:19:35,554 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [35 Valid, 73 Invalid, 94 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [24 Valid, 70 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-20 23:19:35,555 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52 states. [2021-11-20 23:19:35,560 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52 to 45. [2021-11-20 23:19:35,560 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 45 states, 44 states have (on average 1.0681818181818181) internal successors, (47), 44 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 23:19:35,563 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 47 transitions. [2021-11-20 23:19:35,563 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 47 transitions. Word has length 36 [2021-11-20 23:19:35,564 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:19:35,564 INFO L470 AbstractCegarLoop]: Abstraction has 45 states and 47 transitions. [2021-11-20 23:19:35,564 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 12 states have (on average 4.75) internal successors, (57), 11 states have internal predecessors, (57), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:19:35,564 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 47 transitions. [2021-11-20 23:19:35,566 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2021-11-20 23:19:35,566 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:19:35,566 INFO L514 BasicCegarLoop]: trace histogram [7, 6, 6, 6, 6, 5, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:19:35,596 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Ended with exit code 0 [2021-11-20 23:19:35,782 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:19:35,783 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:19:35,783 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:19:35,783 INFO L85 PathProgramCache]: Analyzing trace with hash -590488101, now seen corresponding path program 6 times [2021-11-20 23:19:35,784 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:19:35,784 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2020886808] [2021-11-20 23:19:35,784 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:19:35,784 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:19:35,829 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:19:36,023 INFO L134 CoverageAnalysis]: Checked inductivity of 102 backedges. 57 proven. 45 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:19:36,023 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:19:36,023 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2020886808] [2021-11-20 23:19:36,023 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2020886808] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:19:36,023 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [478965451] [2021-11-20 23:19:36,023 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-20 23:19:36,023 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:19:36,023 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:19:36,024 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:19:36,025 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-20 23:19:36,086 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-20 23:19:36,086 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:19:36,087 INFO L263 TraceCheckSpWp]: Trace formula consists of 169 conjuncts, 15 conjunts are in the unsatisfiable core [2021-11-20 23:19:36,090 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:19:36,364 INFO L134 CoverageAnalysis]: Checked inductivity of 102 backedges. 72 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:19:36,365 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:19:36,521 INFO L134 CoverageAnalysis]: Checked inductivity of 102 backedges. 72 proven. 30 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:19:36,521 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [478965451] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:19:36,521 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1284478570] [2021-11-20 23:19:36,523 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-20 23:19:36,524 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:19:36,524 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:19:36,524 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:19:36,525 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:19:38,363 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:19:38,717 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:19:38,717 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:19:38,717 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 26 [2021-11-20 23:19:38,717 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [417293484] [2021-11-20 23:19:38,717 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:19:38,718 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2021-11-20 23:19:38,718 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:19:38,718 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-11-20 23:19:38,719 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=206, Invalid=984, Unknown=0, NotChecked=0, Total=1190 [2021-11-20 23:19:38,719 INFO L87 Difference]: Start difference. First operand 45 states and 47 transitions. Second operand has 26 states, 26 states have (on average 3.269230769230769) internal successors, (85), 26 states have internal predecessors, (85), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:19:39,089 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:19:39,090 INFO L93 Difference]: Finished difference Result 124 states and 135 transitions. [2021-11-20 23:19:39,090 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-11-20 23:19:39,090 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 3.269230769230769) internal successors, (85), 26 states have internal predecessors, (85), 0 states have call successors, (0), 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 44 [2021-11-20 23:19:39,091 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:19:39,091 INFO L225 Difference]: With dead ends: 124 [2021-11-20 23:19:39,091 INFO L226 Difference]: Without dead ends: 70 [2021-11-20 23:19:39,093 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 158 GetRequests, 112 SyntacticMatches, 0 SemanticMatches, 46 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 654 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=422, Invalid=1834, Unknown=0, NotChecked=0, Total=2256 [2021-11-20 23:19:39,094 INFO L933 BasicCegarLoop]: 14 mSDtfsCounter, 70 mSDsluCounter, 132 mSDsCounter, 0 mSdLazyCounter, 171 mSolverCounterSat, 57 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 70 SdHoareTripleChecker+Valid, 146 SdHoareTripleChecker+Invalid, 228 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 57 IncrementalHoareTripleChecker+Valid, 171 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-20 23:19:39,094 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [70 Valid, 146 Invalid, 228 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [57 Valid, 171 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-20 23:19:39,095 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2021-11-20 23:19:39,113 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 49. [2021-11-20 23:19:39,114 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 49 states, 48 states have (on average 1.0625) internal successors, (51), 48 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 23:19:39,115 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 49 states to 49 states and 51 transitions. [2021-11-20 23:19:39,115 INFO L78 Accepts]: Start accepts. Automaton has 49 states and 51 transitions. Word has length 44 [2021-11-20 23:19:39,115 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:19:39,115 INFO L470 AbstractCegarLoop]: Abstraction has 49 states and 51 transitions. [2021-11-20 23:19:39,116 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 26 states have (on average 3.269230769230769) internal successors, (85), 26 states have internal predecessors, (85), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:19:39,116 INFO L276 IsEmpty]: Start isEmpty. Operand 49 states and 51 transitions. [2021-11-20 23:19:39,117 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2021-11-20 23:19:39,117 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:19:39,118 INFO L514 BasicCegarLoop]: trace histogram [8, 7, 7, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:19:39,150 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-20 23:19:39,340 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:19:39,340 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:19:39,341 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:19:39,341 INFO L85 PathProgramCache]: Analyzing trace with hash 1203330149, now seen corresponding path program 7 times [2021-11-20 23:19:39,341 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:19:39,341 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [321558700] [2021-11-20 23:19:39,341 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:19:39,341 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:19:39,368 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:19:39,478 INFO L134 CoverageAnalysis]: Checked inductivity of 128 backedges. 42 proven. 86 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:19:39,479 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:19:39,479 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [321558700] [2021-11-20 23:19:39,479 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [321558700] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:19:39,479 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [710263586] [2021-11-20 23:19:39,479 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-20 23:19:39,479 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:19:39,479 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:19:39,480 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:19:39,481 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-20 23:19:39,533 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:19:39,535 INFO L263 TraceCheckSpWp]: Trace formula consists of 189 conjuncts, 17 conjunts are in the unsatisfiable core [2021-11-20 23:19:39,537 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:19:39,691 INFO L134 CoverageAnalysis]: Checked inductivity of 128 backedges. 56 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:19:39,691 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:19:39,845 INFO L134 CoverageAnalysis]: Checked inductivity of 128 backedges. 56 proven. 72 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:19:39,846 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [710263586] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:19:39,846 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1539310781] [2021-11-20 23:19:39,848 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-20 23:19:39,849 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:19:39,849 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:19:39,849 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:19:39,850 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:19:41,419 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:19:41,727 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:19:41,727 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:19:41,727 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 10, 10] total 13 [2021-11-20 23:19:41,727 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [464370971] [2021-11-20 23:19:41,727 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:19:41,728 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2021-11-20 23:19:41,728 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:19:41,729 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2021-11-20 23:19:41,729 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=110, Invalid=396, Unknown=0, NotChecked=0, Total=506 [2021-11-20 23:19:41,730 INFO L87 Difference]: Start difference. First operand 49 states and 51 transitions. Second operand has 14 states, 14 states have (on average 4.928571428571429) internal successors, (69), 13 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 23:19:41,926 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:19:41,926 INFO L93 Difference]: Finished difference Result 66 states and 69 transitions. [2021-11-20 23:19:41,926 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-11-20 23:19:41,926 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 4.928571428571429) internal successors, (69), 13 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 48 [2021-11-20 23:19:41,927 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:19:41,927 INFO L225 Difference]: With dead ends: 66 [2021-11-20 23:19:41,928 INFO L226 Difference]: Without dead ends: 64 [2021-11-20 23:19:41,928 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 168 GetRequests, 136 SyntacticMatches, 1 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 295 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=245, Invalid=811, Unknown=0, NotChecked=0, Total=1056 [2021-11-20 23:19:41,929 INFO L933 BasicCegarLoop]: 16 mSDtfsCounter, 44 mSDsluCounter, 84 mSDsCounter, 0 mSdLazyCounter, 94 mSolverCounterSat, 30 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 44 SdHoareTripleChecker+Valid, 93 SdHoareTripleChecker+Invalid, 124 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 30 IncrementalHoareTripleChecker+Valid, 94 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-20 23:19:41,930 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [44 Valid, 93 Invalid, 124 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [30 Valid, 94 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-20 23:19:41,931 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2021-11-20 23:19:41,937 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 57. [2021-11-20 23:19:41,937 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 57 states, 56 states have (on average 1.0535714285714286) internal successors, (59), 56 states have internal predecessors, (59), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:19:41,938 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 59 transitions. [2021-11-20 23:19:41,938 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 59 transitions. Word has length 48 [2021-11-20 23:19:41,939 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:19:41,939 INFO L470 AbstractCegarLoop]: Abstraction has 57 states and 59 transitions. [2021-11-20 23:19:41,939 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 4.928571428571429) internal successors, (69), 13 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 23:19:41,940 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 59 transitions. [2021-11-20 23:19:41,941 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2021-11-20 23:19:41,941 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:19:41,941 INFO L514 BasicCegarLoop]: trace histogram [9, 8, 8, 8, 8, 7, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:19:41,969 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-11-20 23:19:42,146 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:19:42,147 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:19:42,147 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:19:42,147 INFO L85 PathProgramCache]: Analyzing trace with hash 1063876939, now seen corresponding path program 8 times [2021-11-20 23:19:42,148 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:19:42,148 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1146106471] [2021-11-20 23:19:42,149 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:19:42,149 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:19:42,174 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:19:42,377 INFO L134 CoverageAnalysis]: Checked inductivity of 184 backedges. 107 proven. 77 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:19:42,377 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:19:42,377 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1146106471] [2021-11-20 23:19:42,377 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1146106471] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:19:42,377 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [790274758] [2021-11-20 23:19:42,377 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-20 23:19:42,377 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:19:42,377 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:19:42,378 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:19:42,379 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-11-20 23:19:42,450 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2021-11-20 23:19:42,450 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:19:42,452 INFO L263 TraceCheckSpWp]: Trace formula consists of 213 conjuncts, 19 conjunts are in the unsatisfiable core [2021-11-20 23:19:42,455 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:19:42,928 INFO L134 CoverageAnalysis]: Checked inductivity of 184 backedges. 128 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:19:42,928 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:19:43,178 INFO L134 CoverageAnalysis]: Checked inductivity of 184 backedges. 128 proven. 56 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:19:43,178 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [790274758] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:19:43,178 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1423289807] [2021-11-20 23:19:43,180 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-20 23:19:43,181 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:19:43,181 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:19:43,181 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:19:43,181 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:19:44,789 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:19:45,133 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:19:45,133 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:19:45,133 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19] total 32 [2021-11-20 23:19:45,134 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1010918312] [2021-11-20 23:19:45,134 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:19:45,134 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2021-11-20 23:19:45,134 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:19:45,135 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2021-11-20 23:19:45,136 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=290, Invalid=1350, Unknown=0, NotChecked=0, Total=1640 [2021-11-20 23:19:45,136 INFO L87 Difference]: Start difference. First operand 57 states and 59 transitions. Second operand has 32 states, 32 states have (on average 3.28125) internal successors, (105), 32 states have internal predecessors, (105), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:19:45,600 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:19:45,600 INFO L93 Difference]: Finished difference Result 158 states and 171 transitions. [2021-11-20 23:19:45,600 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-11-20 23:19:45,600 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 3.28125) internal successors, (105), 32 states have internal predecessors, (105), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 56 [2021-11-20 23:19:45,601 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:19:45,602 INFO L225 Difference]: With dead ends: 158 [2021-11-20 23:19:45,602 INFO L226 Difference]: Without dead ends: 88 [2021-11-20 23:19:45,604 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 202 GetRequests, 146 SyntacticMatches, 0 SemanticMatches, 56 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 950 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=640, Invalid=2666, Unknown=0, NotChecked=0, Total=3306 [2021-11-20 23:19:45,605 INFO L933 BasicCegarLoop]: 18 mSDtfsCounter, 96 mSDsluCounter, 153 mSDsCounter, 0 mSdLazyCounter, 191 mSolverCounterSat, 73 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 96 SdHoareTripleChecker+Valid, 171 SdHoareTripleChecker+Invalid, 264 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 73 IncrementalHoareTripleChecker+Valid, 191 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-20 23:19:45,605 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [96 Valid, 171 Invalid, 264 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [73 Valid, 191 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-20 23:19:45,606 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 88 states. [2021-11-20 23:19:45,618 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 88 to 61. [2021-11-20 23:19:45,622 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 61 states, 60 states have (on average 1.05) internal successors, (63), 60 states have internal predecessors, (63), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:19:45,626 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 63 transitions. [2021-11-20 23:19:45,628 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 63 transitions. Word has length 56 [2021-11-20 23:19:45,629 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:19:45,629 INFO L470 AbstractCegarLoop]: Abstraction has 61 states and 63 transitions. [2021-11-20 23:19:45,629 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 32 states have (on average 3.28125) internal successors, (105), 32 states have internal predecessors, (105), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:19:45,630 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 63 transitions. [2021-11-20 23:19:45,631 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2021-11-20 23:19:45,633 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:19:45,633 INFO L514 BasicCegarLoop]: trace histogram [10, 9, 9, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:19:45,674 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-11-20 23:19:45,846 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2021-11-20 23:19:45,847 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:19:45,847 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:19:45,847 INFO L85 PathProgramCache]: Analyzing trace with hash -1314293547, now seen corresponding path program 9 times [2021-11-20 23:19:45,847 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:19:45,847 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [370332559] [2021-11-20 23:19:45,848 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:19:45,848 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:19:45,871 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:19:45,991 INFO L134 CoverageAnalysis]: Checked inductivity of 218 backedges. 72 proven. 146 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:19:45,991 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:19:45,991 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [370332559] [2021-11-20 23:19:45,991 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [370332559] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:19:45,991 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [146291564] [2021-11-20 23:19:45,992 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-20 23:19:45,992 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:19:45,992 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:19:45,992 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:19:45,993 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-11-20 23:19:46,042 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-20 23:19:46,042 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:19:46,044 INFO L263 TraceCheckSpWp]: Trace formula consists of 233 conjuncts, 21 conjunts are in the unsatisfiable core [2021-11-20 23:19:46,045 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:19:46,192 INFO L134 CoverageAnalysis]: Checked inductivity of 218 backedges. 90 proven. 128 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:19:46,193 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:19:46,336 INFO L134 CoverageAnalysis]: Checked inductivity of 218 backedges. 90 proven. 128 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:19:46,337 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [146291564] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:19:46,337 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [570438342] [2021-11-20 23:19:46,352 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-20 23:19:46,353 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:19:46,353 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:19:46,353 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:19:46,353 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:19:47,551 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:19:47,882 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:19:47,882 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:19:47,882 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12] total 15 [2021-11-20 23:19:47,882 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1360624430] [2021-11-20 23:19:47,882 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:19:47,883 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2021-11-20 23:19:47,883 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:19:47,883 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2021-11-20 23:19:47,883 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=133, Invalid=467, Unknown=0, NotChecked=0, Total=600 [2021-11-20 23:19:47,884 INFO L87 Difference]: Start difference. First operand 61 states and 63 transitions. Second operand has 16 states, 16 states have (on average 5.0625) internal successors, (81), 15 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 23:19:48,089 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:19:48,089 INFO L93 Difference]: Finished difference Result 78 states and 81 transitions. [2021-11-20 23:19:48,089 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2021-11-20 23:19:48,090 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 5.0625) internal successors, (81), 15 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 60 [2021-11-20 23:19:48,090 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:19:48,090 INFO L225 Difference]: With dead ends: 78 [2021-11-20 23:19:48,091 INFO L226 Difference]: Without dead ends: 76 [2021-11-20 23:19:48,092 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 210 GetRequests, 174 SyntacticMatches, 1 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 379 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=318, Invalid=1014, Unknown=0, NotChecked=0, Total=1332 [2021-11-20 23:19:48,092 INFO L933 BasicCegarLoop]: 18 mSDtfsCounter, 69 mSDsluCounter, 84 mSDsCounter, 0 mSdLazyCounter, 98 mSolverCounterSat, 46 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 69 SdHoareTripleChecker+Valid, 97 SdHoareTripleChecker+Invalid, 144 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 46 IncrementalHoareTripleChecker+Valid, 98 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-20 23:19:48,093 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [69 Valid, 97 Invalid, 144 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [46 Valid, 98 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-20 23:19:48,094 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 76 states. [2021-11-20 23:19:48,100 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 76 to 69. [2021-11-20 23:19:48,101 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 69 states, 68 states have (on average 1.0441176470588236) internal successors, (71), 68 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 23:19:48,101 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 71 transitions. [2021-11-20 23:19:48,102 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 71 transitions. Word has length 60 [2021-11-20 23:19:48,102 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:19:48,102 INFO L470 AbstractCegarLoop]: Abstraction has 69 states and 71 transitions. [2021-11-20 23:19:48,103 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 5.0625) internal successors, (81), 15 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 23:19:48,103 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 71 transitions. [2021-11-20 23:19:48,104 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2021-11-20 23:19:48,104 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:19:48,104 INFO L514 BasicCegarLoop]: trace histogram [11, 10, 10, 10, 10, 9, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:19:48,131 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2021-11-20 23:19:48,311 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2021-11-20 23:19:48,311 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:19:48,311 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:19:48,311 INFO L85 PathProgramCache]: Analyzing trace with hash 325985723, now seen corresponding path program 10 times [2021-11-20 23:19:48,311 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:19:48,311 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1545479375] [2021-11-20 23:19:48,312 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:19:48,312 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:19:48,336 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:19:48,648 INFO L134 CoverageAnalysis]: Checked inductivity of 290 backedges. 173 proven. 117 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:19:48,648 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:19:48,648 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1545479375] [2021-11-20 23:19:48,648 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1545479375] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:19:48,649 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1957030696] [2021-11-20 23:19:48,649 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-20 23:19:48,649 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:19:48,649 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:19:48,650 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:19:48,674 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-11-20 23:19:48,731 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:19:48,733 INFO L263 TraceCheckSpWp]: Trace formula consists of 257 conjuncts, 22 conjunts are in the unsatisfiable core [2021-11-20 23:19:48,737 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:19:49,279 INFO L134 CoverageAnalysis]: Checked inductivity of 290 backedges. 198 proven. 90 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-20 23:19:49,279 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:19:49,495 INFO L134 CoverageAnalysis]: Checked inductivity of 290 backedges. 198 proven. 90 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-20 23:19:49,495 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1957030696] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:19:49,496 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1105430159] [2021-11-20 23:19:49,500 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-20 23:19:49,500 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:19:49,500 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:19:49,500 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:19:49,500 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:19:51,115 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:19:51,497 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:19:51,497 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:19:51,497 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 22, 22] total 35 [2021-11-20 23:19:51,497 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1138077576] [2021-11-20 23:19:51,497 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:19:51,498 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2021-11-20 23:19:51,498 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:19:51,498 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2021-11-20 23:19:51,499 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=327, Invalid=1565, Unknown=0, NotChecked=0, Total=1892 [2021-11-20 23:19:51,499 INFO L87 Difference]: Start difference. First operand 69 states and 71 transitions. Second operand has 35 states, 35 states have (on average 3.3142857142857145) internal successors, (116), 35 states have internal predecessors, (116), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:19:51,826 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:19:51,826 INFO L93 Difference]: Finished difference Result 146 states and 159 transitions. [2021-11-20 23:19:51,826 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2021-11-20 23:19:51,826 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 35 states have (on average 3.3142857142857145) internal successors, (116), 35 states have internal predecessors, (116), 0 states have call successors, (0), 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 23:19:51,827 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:19:51,828 INFO L225 Difference]: With dead ends: 146 [2021-11-20 23:19:51,828 INFO L226 Difference]: Without dead ends: 101 [2021-11-20 23:19:51,830 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 235 GetRequests, 183 SyntacticMatches, 0 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 820 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=549, Invalid=2313, Unknown=0, NotChecked=0, Total=2862 [2021-11-20 23:19:51,831 INFO L933 BasicCegarLoop]: 22 mSDtfsCounter, 65 mSDsluCounter, 182 mSDsCounter, 0 mSdLazyCounter, 221 mSolverCounterSat, 65 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 65 SdHoareTripleChecker+Valid, 204 SdHoareTripleChecker+Invalid, 286 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 65 IncrementalHoareTripleChecker+Valid, 221 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-20 23:19:51,831 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [65 Valid, 204 Invalid, 286 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [65 Valid, 221 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-20 23:19:51,832 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 101 states. [2021-11-20 23:19:51,839 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 101 to 71. [2021-11-20 23:19:51,840 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 71 states, 70 states have (on average 1.042857142857143) internal successors, (73), 70 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 23:19:51,840 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 73 transitions. [2021-11-20 23:19:51,840 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 73 transitions. Word has length 68 [2021-11-20 23:19:51,841 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:19:51,841 INFO L470 AbstractCegarLoop]: Abstraction has 71 states and 73 transitions. [2021-11-20 23:19:51,841 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 35 states have (on average 3.3142857142857145) internal successors, (116), 35 states have internal predecessors, (116), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:19:51,841 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 73 transitions. [2021-11-20 23:19:51,843 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2021-11-20 23:19:51,843 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:19:51,843 INFO L514 BasicCegarLoop]: trace histogram [11, 11, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:19:51,876 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2021-11-20 23:19:52,062 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2021-11-20 23:19:52,063 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:19:52,064 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:19:52,064 INFO L85 PathProgramCache]: Analyzing trace with hash 1366833312, now seen corresponding path program 11 times [2021-11-20 23:19:52,064 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:19:52,064 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1902339772] [2021-11-20 23:19:52,064 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:19:52,064 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:19:52,090 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:19:52,386 INFO L134 CoverageAnalysis]: Checked inductivity of 310 backedges. 173 proven. 137 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:19:52,386 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:19:52,387 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1902339772] [2021-11-20 23:19:52,387 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1902339772] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:19:52,387 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1842695297] [2021-11-20 23:19:52,387 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-20 23:19:52,387 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:19:52,387 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:19:52,388 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:19:52,406 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2021-11-20 23:19:52,477 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 11 check-sat command(s) [2021-11-20 23:19:52,477 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:19:52,479 INFO L263 TraceCheckSpWp]: Trace formula consists of 267 conjuncts, 24 conjunts are in the unsatisfiable core [2021-11-20 23:19:52,482 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:19:52,912 INFO L134 CoverageAnalysis]: Checked inductivity of 310 backedges. 110 proven. 200 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:19:52,913 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:19:53,151 INFO L134 CoverageAnalysis]: Checked inductivity of 310 backedges. 110 proven. 200 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:19:53,151 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1842695297] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:19:53,151 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1787808980] [2021-11-20 23:19:53,157 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-20 23:19:53,157 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:19:53,158 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:19:53,158 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:19:53,158 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:19:54,688 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:19:55,071 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:19:55,071 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:19:55,071 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 13, 13] total 36 [2021-11-20 23:19:55,072 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [822923242] [2021-11-20 23:19:55,072 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:19:55,072 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 36 states [2021-11-20 23:19:55,073 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:19:55,073 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2021-11-20 23:19:55,074 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=279, Invalid=1701, Unknown=0, NotChecked=0, Total=1980 [2021-11-20 23:19:55,074 INFO L87 Difference]: Start difference. First operand 71 states and 73 transitions. Second operand has 36 states, 36 states have (on average 3.861111111111111) internal successors, (139), 36 states have internal predecessors, (139), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:19:56,086 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:19:56,086 INFO L93 Difference]: Finished difference Result 160 states and 175 transitions. [2021-11-20 23:19:56,086 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 49 states. [2021-11-20 23:19:56,086 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 36 states have (on average 3.861111111111111) internal successors, (139), 36 states have internal predecessors, (139), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 70 [2021-11-20 23:19:56,086 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:19:56,087 INFO L225 Difference]: With dead ends: 160 [2021-11-20 23:19:56,087 INFO L226 Difference]: Without dead ends: 113 [2021-11-20 23:19:56,090 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 287 GetRequests, 199 SyntacticMatches, 1 SemanticMatches, 87 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2466 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=1184, Invalid=6648, Unknown=0, NotChecked=0, Total=7832 [2021-11-20 23:19:56,091 INFO L933 BasicCegarLoop]: 14 mSDtfsCounter, 186 mSDsluCounter, 135 mSDsCounter, 0 mSdLazyCounter, 517 mSolverCounterSat, 185 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 186 SdHoareTripleChecker+Valid, 148 SdHoareTripleChecker+Invalid, 702 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 185 IncrementalHoareTripleChecker+Valid, 517 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-20 23:19:56,091 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [186 Valid, 148 Invalid, 702 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [185 Valid, 517 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-20 23:19:56,092 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 113 states. [2021-11-20 23:19:56,102 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 113 to 77. [2021-11-20 23:19:56,103 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 77 states, 76 states have (on average 1.0394736842105263) internal successors, (79), 76 states have internal predecessors, (79), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:19:56,103 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 79 transitions. [2021-11-20 23:19:56,104 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 79 transitions. Word has length 70 [2021-11-20 23:19:56,104 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:19:56,104 INFO L470 AbstractCegarLoop]: Abstraction has 77 states and 79 transitions. [2021-11-20 23:19:56,104 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 36 states, 36 states have (on average 3.861111111111111) internal successors, (139), 36 states have internal predecessors, (139), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:19:56,105 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 79 transitions. [2021-11-20 23:19:56,105 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2021-11-20 23:19:56,106 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:19:56,106 INFO L514 BasicCegarLoop]: trace histogram [12, 12, 11, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:19:56,144 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2021-11-20 23:19:56,326 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2021-11-20 23:19:56,327 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:19:56,327 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:19:56,327 INFO L85 PathProgramCache]: Analyzing trace with hash -1928614536, now seen corresponding path program 12 times [2021-11-20 23:19:56,327 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:19:56,327 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [22055362] [2021-11-20 23:19:56,328 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:19:56,328 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:19:56,356 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:19:56,683 INFO L134 CoverageAnalysis]: Checked inductivity of 374 backedges. 212 proven. 162 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:19:56,683 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:19:56,683 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [22055362] [2021-11-20 23:19:56,683 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [22055362] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:19:56,684 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [359513457] [2021-11-20 23:19:56,684 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-20 23:19:56,684 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:19:56,684 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:19:56,687 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:19:56,710 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2021-11-20 23:19:56,768 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-20 23:19:56,769 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:19:56,771 INFO L263 TraceCheckSpWp]: Trace formula consists of 289 conjuncts, 26 conjunts are in the unsatisfiable core [2021-11-20 23:19:56,773 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:19:57,243 INFO L134 CoverageAnalysis]: Checked inductivity of 374 backedges. 132 proven. 242 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:19:57,243 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:19:57,494 INFO L134 CoverageAnalysis]: Checked inductivity of 374 backedges. 132 proven. 242 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:19:57,495 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [359513457] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:19:57,495 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [893506730] [2021-11-20 23:19:57,497 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-20 23:19:57,497 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:19:57,498 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:19:57,498 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:19:57,498 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:19:58,901 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:19:59,306 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:19:59,306 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:19:59,307 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 14, 14] total 39 [2021-11-20 23:19:59,307 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [94458543] [2021-11-20 23:19:59,307 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:19:59,308 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 39 states [2021-11-20 23:19:59,308 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:19:59,308 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2021-11-20 23:19:59,309 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=319, Invalid=1937, Unknown=0, NotChecked=0, Total=2256 [2021-11-20 23:19:59,310 INFO L87 Difference]: Start difference. First operand 77 states and 79 transitions. Second operand has 39 states, 39 states have (on average 3.871794871794872) internal successors, (151), 39 states have internal predecessors, (151), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:20:00,480 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:20:00,481 INFO L93 Difference]: Finished difference Result 173 states and 189 transitions. [2021-11-20 23:20:00,481 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 53 states. [2021-11-20 23:20:00,481 INFO L78 Accepts]: Start accepts. Automaton has has 39 states, 39 states have (on average 3.871794871794872) internal successors, (151), 39 states have internal predecessors, (151), 0 states have call successors, (0), 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 23:20:00,482 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:20:00,483 INFO L225 Difference]: With dead ends: 173 [2021-11-20 23:20:00,483 INFO L226 Difference]: Without dead ends: 122 [2021-11-20 23:20:00,490 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 312 GetRequests, 217 SyntacticMatches, 1 SemanticMatches, 94 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2902 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=1378, Invalid=7742, Unknown=0, NotChecked=0, Total=9120 [2021-11-20 23:20:00,492 INFO L933 BasicCegarLoop]: 15 mSDtfsCounter, 170 mSDsluCounter, 163 mSDsCounter, 0 mSdLazyCounter, 592 mSolverCounterSat, 171 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 170 SdHoareTripleChecker+Valid, 177 SdHoareTripleChecker+Invalid, 763 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 171 IncrementalHoareTripleChecker+Valid, 592 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-20 23:20:00,494 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [170 Valid, 177 Invalid, 763 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [171 Valid, 592 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-20 23:20:00,495 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 122 states. [2021-11-20 23:20:00,508 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 122 to 83. [2021-11-20 23:20:00,510 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 83 states, 82 states have (on average 1.0365853658536586) internal successors, (85), 82 states have internal predecessors, (85), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:20:00,511 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 85 transitions. [2021-11-20 23:20:00,511 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 85 transitions. Word has length 76 [2021-11-20 23:20:00,512 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:20:00,512 INFO L470 AbstractCegarLoop]: Abstraction has 83 states and 85 transitions. [2021-11-20 23:20:00,512 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 39 states, 39 states have (on average 3.871794871794872) internal successors, (151), 39 states have internal predecessors, (151), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:20:00,513 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 85 transitions. [2021-11-20 23:20:00,514 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2021-11-20 23:20:00,514 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:20:00,514 INFO L514 BasicCegarLoop]: trace histogram [13, 13, 12, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:20:00,559 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2021-11-20 23:20:00,738 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2021-11-20 23:20:00,739 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:20:00,739 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:20:00,739 INFO L85 PathProgramCache]: Analyzing trace with hash -1246411120, now seen corresponding path program 13 times [2021-11-20 23:20:00,740 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:20:00,740 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2134694179] [2021-11-20 23:20:00,740 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:20:00,740 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:20:00,776 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:20:01,112 INFO L134 CoverageAnalysis]: Checked inductivity of 444 backedges. 255 proven. 189 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:20:01,113 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:20:01,113 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2134694179] [2021-11-20 23:20:01,113 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2134694179] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:20:01,113 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1695760985] [2021-11-20 23:20:01,113 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-20 23:20:01,113 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:20:01,114 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:20:01,114 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:20:01,115 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2021-11-20 23:20:01,178 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:20:01,180 INFO L263 TraceCheckSpWp]: Trace formula consists of 311 conjuncts, 28 conjunts are in the unsatisfiable core [2021-11-20 23:20:01,182 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:20:01,761 INFO L134 CoverageAnalysis]: Checked inductivity of 444 backedges. 288 proven. 156 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:20:01,761 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:20:02,042 INFO L134 CoverageAnalysis]: Checked inductivity of 444 backedges. 288 proven. 156 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:20:02,043 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1695760985] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:20:02,043 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1979787471] [2021-11-20 23:20:02,047 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-20 23:20:02,048 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:20:02,049 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:20:02,049 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:20:02,049 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:20:03,391 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:20:03,809 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:20:03,810 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:20:03,810 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28, 28] total 43 [2021-11-20 23:20:03,810 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [355257611] [2021-11-20 23:20:03,810 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:20:03,811 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 43 states [2021-11-20 23:20:03,811 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:20:03,811 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2021-11-20 23:20:03,812 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=477, Invalid=2175, Unknown=0, NotChecked=0, Total=2652 [2021-11-20 23:20:03,813 INFO L87 Difference]: Start difference. First operand 83 states and 85 transitions. Second operand has 43 states, 43 states have (on average 3.2093023255813953) internal successors, (138), 43 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 23:20:04,210 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:20:04,211 INFO L93 Difference]: Finished difference Result 179 states and 195 transitions. [2021-11-20 23:20:04,211 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2021-11-20 23:20:04,211 INFO L78 Accepts]: Start accepts. Automaton has has 43 states, 43 states have (on average 3.2093023255813953) internal successors, (138), 43 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) Word has length 82 [2021-11-20 23:20:04,211 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:20:04,212 INFO L225 Difference]: With dead ends: 179 [2021-11-20 23:20:04,212 INFO L226 Difference]: Without dead ends: 124 [2021-11-20 23:20:04,214 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 285 GetRequests, 222 SyntacticMatches, 0 SemanticMatches, 63 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1150 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=843, Invalid=3317, Unknown=0, NotChecked=0, Total=4160 [2021-11-20 23:20:04,214 INFO L933 BasicCegarLoop]: 28 mSDtfsCounter, 90 mSDsluCounter, 223 mSDsCounter, 0 mSdLazyCounter, 272 mSolverCounterSat, 69 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 90 SdHoareTripleChecker+Valid, 251 SdHoareTripleChecker+Invalid, 341 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 69 IncrementalHoareTripleChecker+Valid, 272 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-20 23:20:04,215 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [90 Valid, 251 Invalid, 341 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [69 Valid, 272 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-20 23:20:04,215 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 124 states. [2021-11-20 23:20:04,220 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 124 to 85. [2021-11-20 23:20:04,220 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 85 states, 84 states have (on average 1.0357142857142858) internal successors, (87), 84 states have internal predecessors, (87), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:20:04,221 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 87 transitions. [2021-11-20 23:20:04,221 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 87 transitions. Word has length 82 [2021-11-20 23:20:04,221 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:20:04,221 INFO L470 AbstractCegarLoop]: Abstraction has 85 states and 87 transitions. [2021-11-20 23:20:04,221 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 43 states, 43 states have (on average 3.2093023255813953) internal successors, (138), 43 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 23:20:04,221 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 87 transitions. [2021-11-20 23:20:04,222 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 85 [2021-11-20 23:20:04,222 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:20:04,222 INFO L514 BasicCegarLoop]: trace histogram [14, 13, 13, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:20:04,246 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Ended with exit code 0 [2021-11-20 23:20:04,422 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2021-11-20 23:20:04,423 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:20:04,423 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:20:04,423 INFO L85 PathProgramCache]: Analyzing trace with hash 1761469621, now seen corresponding path program 14 times [2021-11-20 23:20:04,423 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:20:04,423 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [59774336] [2021-11-20 23:20:04,423 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:20:04,423 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:20:04,450 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:20:04,629 INFO L134 CoverageAnalysis]: Checked inductivity of 470 backedges. 156 proven. 314 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:20:04,630 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:20:04,630 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [59774336] [2021-11-20 23:20:04,630 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [59774336] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:20:04,630 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1280687748] [2021-11-20 23:20:04,630 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-20 23:20:04,630 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:20:04,630 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:20:04,635 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:20:04,659 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2021-11-20 23:20:04,734 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 14 check-sat command(s) [2021-11-20 23:20:04,734 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:20:04,736 INFO L263 TraceCheckSpWp]: Trace formula consists of 321 conjuncts, 29 conjunts are in the unsatisfiable core [2021-11-20 23:20:04,738 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:20:04,941 INFO L134 CoverageAnalysis]: Checked inductivity of 470 backedges. 182 proven. 288 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:20:04,942 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:20:05,171 INFO L134 CoverageAnalysis]: Checked inductivity of 470 backedges. 182 proven. 288 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:20:05,171 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1280687748] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:20:05,171 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1933374843] [2021-11-20 23:20:05,173 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-20 23:20:05,173 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:20:05,174 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:20:05,174 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:20:05,174 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:20:06,723 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:20:07,034 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:20:07,034 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:20:07,034 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16, 16] total 19 [2021-11-20 23:20:07,034 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2086447609] [2021-11-20 23:20:07,034 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:20:07,035 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2021-11-20 23:20:07,035 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:20:07,035 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-11-20 23:20:07,036 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=191, Invalid=621, Unknown=0, NotChecked=0, Total=812 [2021-11-20 23:20:07,036 INFO L87 Difference]: Start difference. First operand 85 states and 87 transitions. Second operand has 20 states, 20 states have (on average 5.25) internal successors, (105), 19 states have internal predecessors, (105), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:20:07,283 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:20:07,283 INFO L93 Difference]: Finished difference Result 102 states and 105 transitions. [2021-11-20 23:20:07,284 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2021-11-20 23:20:07,284 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 5.25) internal successors, (105), 19 states have internal predecessors, (105), 0 states have call successors, (0), 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 84 [2021-11-20 23:20:07,284 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:20:07,284 INFO L225 Difference]: With dead ends: 102 [2021-11-20 23:20:07,284 INFO L226 Difference]: Without dead ends: 100 [2021-11-20 23:20:07,285 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 294 GetRequests, 250 SyntacticMatches, 1 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 571 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=500, Invalid=1480, Unknown=0, NotChecked=0, Total=1980 [2021-11-20 23:20:07,286 INFO L933 BasicCegarLoop]: 22 mSDtfsCounter, 110 mSDsluCounter, 105 mSDsCounter, 0 mSdLazyCounter, 136 mSolverCounterSat, 75 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 110 SdHoareTripleChecker+Valid, 123 SdHoareTripleChecker+Invalid, 211 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 75 IncrementalHoareTripleChecker+Valid, 136 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-20 23:20:07,286 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [110 Valid, 123 Invalid, 211 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [75 Valid, 136 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-20 23:20:07,286 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2021-11-20 23:20:07,290 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 93. [2021-11-20 23:20:07,290 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 93 states, 92 states have (on average 1.0326086956521738) internal successors, (95), 92 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 23:20:07,291 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 93 states to 93 states and 95 transitions. [2021-11-20 23:20:07,291 INFO L78 Accepts]: Start accepts. Automaton has 93 states and 95 transitions. Word has length 84 [2021-11-20 23:20:07,291 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:20:07,292 INFO L470 AbstractCegarLoop]: Abstraction has 93 states and 95 transitions. [2021-11-20 23:20:07,292 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 20 states have (on average 5.25) internal successors, (105), 19 states have internal predecessors, (105), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:20:07,292 INFO L276 IsEmpty]: Start isEmpty. Operand 93 states and 95 transitions. [2021-11-20 23:20:07,293 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 93 [2021-11-20 23:20:07,293 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:20:07,293 INFO L514 BasicCegarLoop]: trace histogram [15, 14, 14, 14, 14, 13, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:20:07,316 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2021-11-20 23:20:07,494 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2021-11-20 23:20:07,495 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:20:07,495 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:20:07,495 INFO L85 PathProgramCache]: Analyzing trace with hash -1928810085, now seen corresponding path program 15 times [2021-11-20 23:20:07,496 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:20:07,496 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1233096153] [2021-11-20 23:20:07,496 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:20:07,496 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:20:07,529 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:20:07,901 INFO L134 CoverageAnalysis]: Checked inductivity of 574 backedges. 353 proven. 221 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:20:07,902 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:20:07,902 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1233096153] [2021-11-20 23:20:07,902 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1233096153] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:20:07,902 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1287743637] [2021-11-20 23:20:07,902 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-20 23:20:07,902 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:20:07,902 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:20:07,903 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:20:07,904 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2021-11-20 23:20:07,967 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-20 23:20:07,967 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:20:07,969 INFO L263 TraceCheckSpWp]: Trace formula consists of 345 conjuncts, 31 conjunts are in the unsatisfiable core [2021-11-20 23:20:07,971 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:20:08,725 INFO L134 CoverageAnalysis]: Checked inductivity of 574 backedges. 392 proven. 182 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:20:08,725 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:20:08,998 INFO L134 CoverageAnalysis]: Checked inductivity of 574 backedges. 392 proven. 182 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:20:08,999 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1287743637] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:20:08,999 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2014386392] [2021-11-20 23:20:09,001 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-20 23:20:09,001 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:20:09,001 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:20:09,001 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:20:09,001 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:20:10,599 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:20:11,103 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:20:11,104 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:20:11,104 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [31, 31, 31] total 50 [2021-11-20 23:20:11,104 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [358575389] [2021-11-20 23:20:11,104 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:20:11,105 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 50 states [2021-11-20 23:20:11,105 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:20:11,105 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 50 interpolants. [2021-11-20 23:20:11,107 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=638, Invalid=2784, Unknown=0, NotChecked=0, Total=3422 [2021-11-20 23:20:11,107 INFO L87 Difference]: Start difference. First operand 93 states and 95 transitions. Second operand has 50 states, 50 states have (on average 3.3) internal successors, (165), 50 states have internal predecessors, (165), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:20:11,730 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:20:11,730 INFO L93 Difference]: Finished difference Result 260 states and 279 transitions. [2021-11-20 23:20:11,730 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2021-11-20 23:20:11,731 INFO L78 Accepts]: Start accepts. Automaton has has 50 states, 50 states have (on average 3.3) internal successors, (165), 50 states have internal predecessors, (165), 0 states have call successors, (0), 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 92 [2021-11-20 23:20:11,731 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:20:11,732 INFO L225 Difference]: With dead ends: 260 [2021-11-20 23:20:11,732 INFO L226 Difference]: Without dead ends: 142 [2021-11-20 23:20:11,734 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 334 GetRequests, 248 SyntacticMatches, 0 SemanticMatches, 86 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2126 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=1582, Invalid=6074, Unknown=0, NotChecked=0, Total=7656 [2021-11-20 23:20:11,735 INFO L933 BasicCegarLoop]: 30 mSDtfsCounter, 163 mSDsluCounter, 318 mSDsCounter, 0 mSdLazyCounter, 375 mSolverCounterSat, 104 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 163 SdHoareTripleChecker+Valid, 348 SdHoareTripleChecker+Invalid, 479 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 104 IncrementalHoareTripleChecker+Valid, 375 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-20 23:20:11,735 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [163 Valid, 348 Invalid, 479 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [104 Valid, 375 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-20 23:20:11,736 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 142 states. [2021-11-20 23:20:11,741 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 142 to 97. [2021-11-20 23:20:11,741 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 97 states, 96 states have (on average 1.03125) internal successors, (99), 96 states have internal predecessors, (99), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:20:11,742 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 97 states to 97 states and 99 transitions. [2021-11-20 23:20:11,742 INFO L78 Accepts]: Start accepts. Automaton has 97 states and 99 transitions. Word has length 92 [2021-11-20 23:20:11,742 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:20:11,742 INFO L470 AbstractCegarLoop]: Abstraction has 97 states and 99 transitions. [2021-11-20 23:20:11,743 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 50 states, 50 states have (on average 3.3) internal successors, (165), 50 states have internal predecessors, (165), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:20:11,743 INFO L276 IsEmpty]: Start isEmpty. Operand 97 states and 99 transitions. [2021-11-20 23:20:11,743 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 97 [2021-11-20 23:20:11,744 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:20:11,744 INFO L514 BasicCegarLoop]: trace histogram [16, 15, 15, 14, 14, 14, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:20:11,792 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2021-11-20 23:20:11,960 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2021-11-20 23:20:11,960 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:20:11,960 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:20:11,960 INFO L85 PathProgramCache]: Analyzing trace with hash -806538203, now seen corresponding path program 16 times [2021-11-20 23:20:11,961 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:20:11,961 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1754619198] [2021-11-20 23:20:11,961 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:20:11,961 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:20:11,995 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:20:12,245 INFO L134 CoverageAnalysis]: Checked inductivity of 632 backedges. 210 proven. 422 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:20:12,245 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:20:12,245 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1754619198] [2021-11-20 23:20:12,245 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1754619198] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:20:12,245 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [318502318] [2021-11-20 23:20:12,245 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-20 23:20:12,246 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:20:12,246 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:20:12,247 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:20:12,268 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2021-11-20 23:20:12,345 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:20:12,347 INFO L263 TraceCheckSpWp]: Trace formula consists of 365 conjuncts, 33 conjunts are in the unsatisfiable core [2021-11-20 23:20:12,349 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:20:12,577 INFO L134 CoverageAnalysis]: Checked inductivity of 632 backedges. 240 proven. 392 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:20:12,577 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:20:12,784 INFO L134 CoverageAnalysis]: Checked inductivity of 632 backedges. 240 proven. 392 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:20:12,784 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [318502318] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:20:12,784 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [220127950] [2021-11-20 23:20:12,785 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-20 23:20:12,786 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:20:12,786 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:20:12,786 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:20:12,786 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:20:14,354 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:20:14,709 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:20:14,709 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:20:14,709 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [18, 18, 18] total 21 [2021-11-20 23:20:14,710 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1713480250] [2021-11-20 23:20:14,710 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:20:14,710 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2021-11-20 23:20:14,710 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:20:14,711 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2021-11-20 23:20:14,711 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=226, Invalid=704, Unknown=0, NotChecked=0, Total=930 [2021-11-20 23:20:14,711 INFO L87 Difference]: Start difference. First operand 97 states and 99 transitions. Second operand has 22 states, 22 states have (on average 5.318181818181818) internal successors, (117), 21 states have internal predecessors, (117), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:20:15,093 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:20:15,093 INFO L93 Difference]: Finished difference Result 114 states and 117 transitions. [2021-11-20 23:20:15,094 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2021-11-20 23:20:15,094 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 22 states have (on average 5.318181818181818) internal successors, (117), 21 states have internal predecessors, (117), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 96 [2021-11-20 23:20:15,094 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:20:15,095 INFO L225 Difference]: With dead ends: 114 [2021-11-20 23:20:15,095 INFO L226 Difference]: Without dead ends: 112 [2021-11-20 23:20:15,096 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 336 GetRequests, 288 SyntacticMatches, 1 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 679 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=609, Invalid=1743, Unknown=0, NotChecked=0, Total=2352 [2021-11-20 23:20:15,096 INFO L933 BasicCegarLoop]: 24 mSDtfsCounter, 112 mSDsluCounter, 115 mSDsCounter, 0 mSdLazyCounter, 153 mSolverCounterSat, 70 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 112 SdHoareTripleChecker+Valid, 134 SdHoareTripleChecker+Invalid, 223 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 70 IncrementalHoareTripleChecker+Valid, 153 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-20 23:20:15,097 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [112 Valid, 134 Invalid, 223 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [70 Valid, 153 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-20 23:20:15,097 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 112 states. [2021-11-20 23:20:15,105 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 112 to 105. [2021-11-20 23:20:15,106 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 105 states, 104 states have (on average 1.0288461538461537) internal successors, (107), 104 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 23:20:15,106 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 105 states to 105 states and 107 transitions. [2021-11-20 23:20:15,107 INFO L78 Accepts]: Start accepts. Automaton has 105 states and 107 transitions. Word has length 96 [2021-11-20 23:20:15,107 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:20:15,107 INFO L470 AbstractCegarLoop]: Abstraction has 105 states and 107 transitions. [2021-11-20 23:20:15,107 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 22 states have (on average 5.318181818181818) internal successors, (117), 21 states have internal predecessors, (117), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:20:15,108 INFO L276 IsEmpty]: Start isEmpty. Operand 105 states and 107 transitions. [2021-11-20 23:20:15,108 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 105 [2021-11-20 23:20:15,108 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:20:15,109 INFO L514 BasicCegarLoop]: trace histogram [17, 16, 16, 16, 16, 15, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:20:15,150 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2021-11-20 23:20:15,322 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:20:15,323 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:20:15,323 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:20:15,323 INFO L85 PathProgramCache]: Analyzing trace with hash -1859546869, now seen corresponding path program 17 times [2021-11-20 23:20:15,324 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:20:15,324 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1610027504] [2021-11-20 23:20:15,324 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:20:15,324 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:20:15,360 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:20:15,931 INFO L134 CoverageAnalysis]: Checked inductivity of 752 backedges. 467 proven. 285 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:20:15,931 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:20:15,931 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1610027504] [2021-11-20 23:20:15,931 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1610027504] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:20:15,931 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [57017639] [2021-11-20 23:20:15,931 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-20 23:20:15,931 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:20:15,931 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:20:15,932 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:20:15,933 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2021-11-20 23:20:16,043 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 17 check-sat command(s) [2021-11-20 23:20:16,043 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:20:16,045 INFO L263 TraceCheckSpWp]: Trace formula consists of 389 conjuncts, 35 conjunts are in the unsatisfiable core [2021-11-20 23:20:16,048 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:20:16,840 INFO L134 CoverageAnalysis]: Checked inductivity of 752 backedges. 512 proven. 240 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:20:16,840 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:20:17,120 INFO L134 CoverageAnalysis]: Checked inductivity of 752 backedges. 512 proven. 240 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:20:17,120 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [57017639] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:20:17,120 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [731896107] [2021-11-20 23:20:17,122 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-20 23:20:17,122 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:20:17,122 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:20:17,122 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:20:17,122 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:20:18,729 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:20:19,270 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:20:19,271 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:20:19,271 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [35, 35, 35] total 56 [2021-11-20 23:20:19,271 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [556934189] [2021-11-20 23:20:19,271 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:20:19,272 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 56 states [2021-11-20 23:20:19,272 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:20:19,272 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 56 interpolants. [2021-11-20 23:20:19,272 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=786, Invalid=3374, Unknown=0, NotChecked=0, Total=4160 [2021-11-20 23:20:19,272 INFO L87 Difference]: Start difference. First operand 105 states and 107 transitions. Second operand has 56 states, 56 states have (on average 3.3035714285714284) internal successors, (185), 56 states have internal predecessors, (185), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:20:20,129 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:20:20,129 INFO L93 Difference]: Finished difference Result 294 states and 315 transitions. [2021-11-20 23:20:20,129 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2021-11-20 23:20:20,129 INFO L78 Accepts]: Start accepts. Automaton has has 56 states, 56 states have (on average 3.3035714285714284) internal successors, (185), 56 states have internal predecessors, (185), 0 states have call successors, (0), 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 104 [2021-11-20 23:20:20,130 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:20:20,130 INFO L225 Difference]: With dead ends: 294 [2021-11-20 23:20:20,130 INFO L226 Difference]: Without dead ends: 160 [2021-11-20 23:20:20,131 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 378 GetRequests, 282 SyntacticMatches, 0 SemanticMatches, 96 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2614 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=1992, Invalid=7514, Unknown=0, NotChecked=0, Total=9506 [2021-11-20 23:20:20,132 INFO L933 BasicCegarLoop]: 34 mSDtfsCounter, 194 mSDsluCounter, 403 mSDsCounter, 0 mSdLazyCounter, 465 mSolverCounterSat, 102 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 194 SdHoareTripleChecker+Valid, 437 SdHoareTripleChecker+Invalid, 567 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 102 IncrementalHoareTripleChecker+Valid, 465 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-20 23:20:20,132 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [194 Valid, 437 Invalid, 567 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [102 Valid, 465 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-20 23:20:20,133 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 160 states. [2021-11-20 23:20:20,154 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 160 to 109. [2021-11-20 23:20:20,154 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 109 states, 108 states have (on average 1.0277777777777777) internal successors, (111), 108 states have internal predecessors, (111), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:20:20,155 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 109 states to 109 states and 111 transitions. [2021-11-20 23:20:20,155 INFO L78 Accepts]: Start accepts. Automaton has 109 states and 111 transitions. Word has length 104 [2021-11-20 23:20:20,155 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:20:20,155 INFO L470 AbstractCegarLoop]: Abstraction has 109 states and 111 transitions. [2021-11-20 23:20:20,156 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 56 states, 56 states have (on average 3.3035714285714284) internal successors, (185), 56 states have internal predecessors, (185), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:20:20,156 INFO L276 IsEmpty]: Start isEmpty. Operand 109 states and 111 transitions. [2021-11-20 23:20:20,156 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 109 [2021-11-20 23:20:20,157 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:20:20,157 INFO L514 BasicCegarLoop]: trace histogram [18, 17, 17, 16, 16, 16, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:20:20,178 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Forceful destruction successful, exit code 0 [2021-11-20 23:20:20,358 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:20:20,359 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:20:20,359 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:20:20,359 INFO L85 PathProgramCache]: Analyzing trace with hash -1174629227, now seen corresponding path program 18 times [2021-11-20 23:20:20,360 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:20:20,360 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [354344271] [2021-11-20 23:20:20,360 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:20:20,360 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:20:20,394 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:20:20,694 INFO L134 CoverageAnalysis]: Checked inductivity of 818 backedges. 272 proven. 546 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:20:20,694 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:20:20,694 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [354344271] [2021-11-20 23:20:20,694 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [354344271] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:20:20,694 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2130307458] [2021-11-20 23:20:20,694 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-20 23:20:20,695 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:20:20,695 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:20:20,703 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:20:20,722 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2021-11-20 23:20:20,806 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-20 23:20:20,807 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:20:20,810 INFO L263 TraceCheckSpWp]: Trace formula consists of 409 conjuncts, 37 conjunts are in the unsatisfiable core [2021-11-20 23:20:20,812 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:20:21,186 INFO L134 CoverageAnalysis]: Checked inductivity of 818 backedges. 306 proven. 512 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:20:21,186 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:20:21,543 INFO L134 CoverageAnalysis]: Checked inductivity of 818 backedges. 306 proven. 512 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:20:21,544 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2130307458] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:20:21,544 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1429516535] [2021-11-20 23:20:21,547 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-20 23:20:21,548 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:20:21,549 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:20:21,549 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:20:21,549 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:20:22,823 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:20:23,113 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:20:23,113 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:20:23,113 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 20, 20] total 23 [2021-11-20 23:20:23,113 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [60589839] [2021-11-20 23:20:23,114 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:20:23,114 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2021-11-20 23:20:23,114 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:20:23,114 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-11-20 23:20:23,114 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=265, Invalid=791, Unknown=0, NotChecked=0, Total=1056 [2021-11-20 23:20:23,115 INFO L87 Difference]: Start difference. First operand 109 states and 111 transitions. Second operand has 24 states, 24 states have (on average 5.375) internal successors, (129), 23 states have internal predecessors, (129), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:20:23,407 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:20:23,407 INFO L93 Difference]: Finished difference Result 126 states and 129 transitions. [2021-11-20 23:20:23,408 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2021-11-20 23:20:23,408 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 24 states have (on average 5.375) internal successors, (129), 23 states have internal predecessors, (129), 0 states have call successors, (0), 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 108 [2021-11-20 23:20:23,408 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:20:23,409 INFO L225 Difference]: With dead ends: 126 [2021-11-20 23:20:23,409 INFO L226 Difference]: Without dead ends: 124 [2021-11-20 23:20:23,409 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 378 GetRequests, 326 SyntacticMatches, 1 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 795 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=730, Invalid=2026, Unknown=0, NotChecked=0, Total=2756 [2021-11-20 23:20:23,410 INFO L933 BasicCegarLoop]: 26 mSDtfsCounter, 92 mSDsluCounter, 139 mSDsCounter, 0 mSdLazyCounter, 182 mSolverCounterSat, 60 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 92 SdHoareTripleChecker+Valid, 159 SdHoareTripleChecker+Invalid, 242 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 60 IncrementalHoareTripleChecker+Valid, 182 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-20 23:20:23,410 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [92 Valid, 159 Invalid, 242 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [60 Valid, 182 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-20 23:20:23,411 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 124 states. [2021-11-20 23:20:23,419 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 124 to 117. [2021-11-20 23:20:23,420 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 117 states, 116 states have (on average 1.0258620689655173) internal successors, (119), 116 states have internal predecessors, (119), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:20:23,421 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 117 states to 117 states and 119 transitions. [2021-11-20 23:20:23,421 INFO L78 Accepts]: Start accepts. Automaton has 117 states and 119 transitions. Word has length 108 [2021-11-20 23:20:23,421 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:20:23,421 INFO L470 AbstractCegarLoop]: Abstraction has 117 states and 119 transitions. [2021-11-20 23:20:23,421 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 24 states have (on average 5.375) internal successors, (129), 23 states have internal predecessors, (129), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:20:23,422 INFO L276 IsEmpty]: Start isEmpty. Operand 117 states and 119 transitions. [2021-11-20 23:20:23,422 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 117 [2021-11-20 23:20:23,422 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:20:23,423 INFO L514 BasicCegarLoop]: trace histogram [19, 18, 18, 18, 18, 17, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:20:23,445 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Forceful destruction successful, exit code 0 [2021-11-20 23:20:23,627 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable20 [2021-11-20 23:20:23,627 INFO L402 AbstractCegarLoop]: === Iteration 22 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:20:23,627 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:20:23,627 INFO L85 PathProgramCache]: Analyzing trace with hash -2083946117, now seen corresponding path program 19 times [2021-11-20 23:20:23,627 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:20:23,627 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1970373430] [2021-11-20 23:20:23,628 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:20:23,628 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:20:23,670 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:20:24,263 INFO L134 CoverageAnalysis]: Checked inductivity of 954 backedges. 597 proven. 357 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:20:24,263 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:20:24,263 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1970373430] [2021-11-20 23:20:24,264 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1970373430] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:20:24,264 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1635654880] [2021-11-20 23:20:24,264 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-20 23:20:24,264 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:20:24,264 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:20:24,265 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:20:24,296 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2021-11-20 23:20:24,351 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:20:24,354 INFO L263 TraceCheckSpWp]: Trace formula consists of 433 conjuncts, 38 conjunts are in the unsatisfiable core [2021-11-20 23:20:24,356 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:20:25,179 INFO L134 CoverageAnalysis]: Checked inductivity of 954 backedges. 646 proven. 306 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-20 23:20:25,179 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:20:25,405 INFO L134 CoverageAnalysis]: Checked inductivity of 954 backedges. 646 proven. 306 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-20 23:20:25,405 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1635654880] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:20:25,405 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1529611649] [2021-11-20 23:20:25,406 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-20 23:20:25,407 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:20:25,407 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:20:25,407 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:20:25,407 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:20:26,737 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:20:27,168 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:20:27,168 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:20:27,168 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [39, 38, 38] total 59 [2021-11-20 23:20:27,168 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1060587097] [2021-11-20 23:20:27,169 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:20:27,169 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 59 states [2021-11-20 23:20:27,169 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:20:27,169 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 59 interpolants. [2021-11-20 23:20:27,170 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=847, Invalid=3709, Unknown=0, NotChecked=0, Total=4556 [2021-11-20 23:20:27,170 INFO L87 Difference]: Start difference. First operand 117 states and 119 transitions. Second operand has 59 states, 59 states have (on average 3.3220338983050848) internal successors, (196), 59 states have internal predecessors, (196), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:20:27,675 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:20:27,676 INFO L93 Difference]: Finished difference Result 250 states and 271 transitions. [2021-11-20 23:20:27,676 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2021-11-20 23:20:27,677 INFO L78 Accepts]: Start accepts. Automaton has has 59 states, 59 states have (on average 3.3220338983050848) internal successors, (196), 59 states have internal predecessors, (196), 0 states have call successors, (0), 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 116 [2021-11-20 23:20:27,677 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:20:27,678 INFO L225 Difference]: With dead ends: 250 [2021-11-20 23:20:27,678 INFO L226 Difference]: Without dead ends: 173 [2021-11-20 23:20:27,679 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 403 GetRequests, 319 SyntacticMatches, 0 SemanticMatches, 84 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1968 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=1533, Invalid=5777, Unknown=0, NotChecked=0, Total=7310 [2021-11-20 23:20:27,679 INFO L933 BasicCegarLoop]: 38 mSDtfsCounter, 163 mSDsluCounter, 374 mSDsCounter, 0 mSdLazyCounter, 447 mSolverCounterSat, 153 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 163 SdHoareTripleChecker+Valid, 412 SdHoareTripleChecker+Invalid, 600 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 153 IncrementalHoareTripleChecker+Valid, 447 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-20 23:20:27,680 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [163 Valid, 412 Invalid, 600 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [153 Valid, 447 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-20 23:20:27,680 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 173 states. [2021-11-20 23:20:27,689 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 173 to 119. [2021-11-20 23:20:27,689 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 119 states, 118 states have (on average 1.0254237288135593) internal successors, (121), 118 states have internal predecessors, (121), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:20:27,690 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 119 states to 119 states and 121 transitions. [2021-11-20 23:20:27,690 INFO L78 Accepts]: Start accepts. Automaton has 119 states and 121 transitions. Word has length 116 [2021-11-20 23:20:27,690 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:20:27,690 INFO L470 AbstractCegarLoop]: Abstraction has 119 states and 121 transitions. [2021-11-20 23:20:27,691 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 59 states, 59 states have (on average 3.3220338983050848) internal successors, (196), 59 states have internal predecessors, (196), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:20:27,691 INFO L276 IsEmpty]: Start isEmpty. Operand 119 states and 121 transitions. [2021-11-20 23:20:27,692 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 119 [2021-11-20 23:20:27,692 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:20:27,692 INFO L514 BasicCegarLoop]: trace histogram [19, 19, 18, 18, 18, 18, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:20:27,723 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Forceful destruction successful, exit code 0 [2021-11-20 23:20:27,906 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable21 [2021-11-20 23:20:27,907 INFO L402 AbstractCegarLoop]: === Iteration 23 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:20:27,907 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:20:27,907 INFO L85 PathProgramCache]: Analyzing trace with hash 146691680, now seen corresponding path program 20 times [2021-11-20 23:20:27,907 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:20:27,907 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [132761904] [2021-11-20 23:20:27,907 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:20:27,907 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:20:27,939 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:20:28,451 INFO L134 CoverageAnalysis]: Checked inductivity of 990 backedges. 597 proven. 393 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:20:28,451 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:20:28,451 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [132761904] [2021-11-20 23:20:28,452 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [132761904] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:20:28,452 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [387886038] [2021-11-20 23:20:28,452 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-20 23:20:28,452 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:20:28,452 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:20:28,453 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:20:28,454 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2021-11-20 23:20:28,538 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 19 check-sat command(s) [2021-11-20 23:20:28,538 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:20:28,540 INFO L263 TraceCheckSpWp]: Trace formula consists of 443 conjuncts, 40 conjunts are in the unsatisfiable core [2021-11-20 23:20:28,542 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:20:29,403 INFO L134 CoverageAnalysis]: Checked inductivity of 990 backedges. 648 proven. 342 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:20:29,403 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:20:29,628 INFO L134 CoverageAnalysis]: Checked inductivity of 990 backedges. 648 proven. 342 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:20:29,628 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [387886038] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:20:29,628 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [65561791] [2021-11-20 23:20:29,629 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-20 23:20:29,629 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:20:29,629 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:20:29,630 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:20:29,630 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:20:30,916 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:20:31,362 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:20:31,362 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:20:31,363 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40, 40, 40] total 61 [2021-11-20 23:20:31,363 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1365402694] [2021-11-20 23:20:31,363 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:20:31,363 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 61 states [2021-11-20 23:20:31,364 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:20:31,364 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 61 interpolants. [2021-11-20 23:20:31,365 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=909, Invalid=3921, Unknown=0, NotChecked=0, Total=4830 [2021-11-20 23:20:31,365 INFO L87 Difference]: Start difference. First operand 119 states and 121 transitions. Second operand has 61 states, 61 states have (on average 3.2459016393442623) internal successors, (198), 61 states have internal predecessors, (198), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:20:31,857 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:20:31,857 INFO L93 Difference]: Finished difference Result 257 states and 279 transitions. [2021-11-20 23:20:31,857 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 40 states. [2021-11-20 23:20:31,858 INFO L78 Accepts]: Start accepts. Automaton has has 61 states, 61 states have (on average 3.2459016393442623) internal successors, (198), 61 states have internal predecessors, (198), 0 states have call successors, (0), 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 118 [2021-11-20 23:20:31,858 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:20:31,859 INFO L225 Difference]: With dead ends: 257 [2021-11-20 23:20:31,859 INFO L226 Difference]: Without dead ends: 178 [2021-11-20 23:20:31,861 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 411 GetRequests, 324 SyntacticMatches, 0 SemanticMatches, 87 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2077 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=1671, Invalid=6161, Unknown=0, NotChecked=0, Total=7832 [2021-11-20 23:20:31,861 INFO L933 BasicCegarLoop]: 40 mSDtfsCounter, 140 mSDsluCounter, 344 mSDsCounter, 0 mSdLazyCounter, 397 mSolverCounterSat, 104 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 140 SdHoareTripleChecker+Valid, 384 SdHoareTripleChecker+Invalid, 501 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 104 IncrementalHoareTripleChecker+Valid, 397 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-20 23:20:31,862 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [140 Valid, 384 Invalid, 501 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [104 Valid, 397 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-20 23:20:31,862 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 178 states. [2021-11-20 23:20:31,872 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 178 to 121. [2021-11-20 23:20:31,872 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 121 states, 120 states have (on average 1.025) internal successors, (123), 120 states have internal predecessors, (123), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:20:31,873 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 121 states to 121 states and 123 transitions. [2021-11-20 23:20:31,873 INFO L78 Accepts]: Start accepts. Automaton has 121 states and 123 transitions. Word has length 118 [2021-11-20 23:20:31,873 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:20:31,873 INFO L470 AbstractCegarLoop]: Abstraction has 121 states and 123 transitions. [2021-11-20 23:20:31,874 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 61 states, 61 states have (on average 3.2459016393442623) internal successors, (198), 61 states have internal predecessors, (198), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:20:31,874 INFO L276 IsEmpty]: Start isEmpty. Operand 121 states and 123 transitions. [2021-11-20 23:20:31,875 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 121 [2021-11-20 23:20:31,875 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:20:31,875 INFO L514 BasicCegarLoop]: trace histogram [20, 19, 19, 18, 18, 18, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:20:31,907 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Forceful destruction successful, exit code 0 [2021-11-20 23:20:32,102 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable22 [2021-11-20 23:20:32,103 INFO L402 AbstractCegarLoop]: === Iteration 24 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:20:32,103 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:20:32,103 INFO L85 PathProgramCache]: Analyzing trace with hash 600933893, now seen corresponding path program 21 times [2021-11-20 23:20:32,103 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:20:32,103 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1821464774] [2021-11-20 23:20:32,103 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:20:32,104 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:20:32,147 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:20:32,434 INFO L134 CoverageAnalysis]: Checked inductivity of 1028 backedges. 342 proven. 686 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:20:32,434 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:20:32,434 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1821464774] [2021-11-20 23:20:32,434 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1821464774] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:20:32,435 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1329939586] [2021-11-20 23:20:32,435 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-20 23:20:32,435 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:20:32,435 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:20:32,435 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:20:32,437 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2021-11-20 23:20:32,515 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-20 23:20:32,515 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:20:32,518 INFO L263 TraceCheckSpWp]: Trace formula consists of 453 conjuncts, 41 conjunts are in the unsatisfiable core [2021-11-20 23:20:32,519 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:20:32,758 INFO L134 CoverageAnalysis]: Checked inductivity of 1028 backedges. 380 proven. 648 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:20:32,758 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:20:33,017 INFO L134 CoverageAnalysis]: Checked inductivity of 1028 backedges. 380 proven. 648 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:20:33,017 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1329939586] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:20:33,017 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [179624173] [2021-11-20 23:20:33,018 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-20 23:20:33,018 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:20:33,018 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:20:33,018 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:20:33,018 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:20:34,079 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:20:34,387 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:20:34,387 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:20:34,387 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [22, 22, 22] total 25 [2021-11-20 23:20:34,387 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1799771391] [2021-11-20 23:20:34,387 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:20:34,388 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2021-11-20 23:20:34,388 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:20:34,388 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-11-20 23:20:34,388 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=308, Invalid=882, Unknown=0, NotChecked=0, Total=1190 [2021-11-20 23:20:34,388 INFO L87 Difference]: Start difference. First operand 121 states and 123 transitions. Second operand has 26 states, 26 states have (on average 5.423076923076923) internal successors, (141), 25 states have internal predecessors, (141), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:20:34,730 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:20:34,730 INFO L93 Difference]: Finished difference Result 138 states and 141 transitions. [2021-11-20 23:20:34,730 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2021-11-20 23:20:34,730 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 5.423076923076923) internal successors, (141), 25 states have internal predecessors, (141), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 120 [2021-11-20 23:20:34,730 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:20:34,731 INFO L225 Difference]: With dead ends: 138 [2021-11-20 23:20:34,731 INFO L226 Difference]: Without dead ends: 136 [2021-11-20 23:20:34,731 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 420 GetRequests, 364 SyntacticMatches, 1 SemanticMatches, 55 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 919 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=863, Invalid=2329, Unknown=0, NotChecked=0, Total=3192 [2021-11-20 23:20:34,732 INFO L933 BasicCegarLoop]: 28 mSDtfsCounter, 96 mSDsluCounter, 175 mSDsCounter, 0 mSdLazyCounter, 211 mSolverCounterSat, 66 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 96 SdHoareTripleChecker+Valid, 194 SdHoareTripleChecker+Invalid, 277 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 66 IncrementalHoareTripleChecker+Valid, 211 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-20 23:20:34,732 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [96 Valid, 194 Invalid, 277 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [66 Valid, 211 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-20 23:20:34,733 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 136 states. [2021-11-20 23:20:34,747 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 136 to 129. [2021-11-20 23:20:34,747 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 129 states, 128 states have (on average 1.0234375) internal successors, (131), 128 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 23:20:34,748 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 129 states to 129 states and 131 transitions. [2021-11-20 23:20:34,748 INFO L78 Accepts]: Start accepts. Automaton has 129 states and 131 transitions. Word has length 120 [2021-11-20 23:20:34,748 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:20:34,749 INFO L470 AbstractCegarLoop]: Abstraction has 129 states and 131 transitions. [2021-11-20 23:20:34,749 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 26 states have (on average 5.423076923076923) internal successors, (141), 25 states have internal predecessors, (141), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:20:34,749 INFO L276 IsEmpty]: Start isEmpty. Operand 129 states and 131 transitions. [2021-11-20 23:20:34,749 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 129 [2021-11-20 23:20:34,749 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:20:34,749 INFO L514 BasicCegarLoop]: trace histogram [21, 20, 20, 20, 20, 19, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:20:34,771 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Forceful destruction successful, exit code 0 [2021-11-20 23:20:34,950 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable23 [2021-11-20 23:20:34,950 INFO L402 AbstractCegarLoop]: === Iteration 25 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:20:34,950 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:20:34,950 INFO L85 PathProgramCache]: Analyzing trace with hash 604898027, now seen corresponding path program 22 times [2021-11-20 23:20:34,950 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:20:34,950 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1623604521] [2021-11-20 23:20:34,950 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:20:34,951 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:20:34,985 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:20:35,670 INFO L134 CoverageAnalysis]: Checked inductivity of 1180 backedges. 743 proven. 437 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:20:35,670 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:20:35,671 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1623604521] [2021-11-20 23:20:35,671 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1623604521] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:20:35,671 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [701310848] [2021-11-20 23:20:35,671 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-20 23:20:35,671 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:20:35,671 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:20:35,675 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:20:35,694 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2021-11-20 23:20:35,767 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:20:35,769 INFO L263 TraceCheckSpWp]: Trace formula consists of 477 conjuncts, 42 conjunts are in the unsatisfiable core [2021-11-20 23:20:35,772 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:20:36,726 INFO L134 CoverageAnalysis]: Checked inductivity of 1180 backedges. 798 proven. 380 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-20 23:20:36,727 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:20:36,962 INFO L134 CoverageAnalysis]: Checked inductivity of 1180 backedges. 798 proven. 380 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-20 23:20:36,962 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [701310848] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:20:36,963 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2049640090] [2021-11-20 23:20:36,963 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-20 23:20:36,964 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:20:36,964 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:20:36,964 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:20:36,964 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:20:37,976 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:20:38,423 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:20:38,423 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:20:38,424 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [43, 42, 42] total 65 [2021-11-20 23:20:38,424 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1908927653] [2021-11-20 23:20:38,424 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:20:38,424 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 65 states [2021-11-20 23:20:38,424 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:20:38,425 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 65 interpolants. [2021-11-20 23:20:38,425 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1017, Invalid=4385, Unknown=0, NotChecked=0, Total=5402 [2021-11-20 23:20:38,425 INFO L87 Difference]: Start difference. First operand 129 states and 131 transitions. Second operand has 65 states, 65 states have (on average 3.3230769230769233) internal successors, (216), 65 states have internal predecessors, (216), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:20:38,992 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:20:38,993 INFO L93 Difference]: Finished difference Result 276 states and 299 transitions. [2021-11-20 23:20:38,993 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2021-11-20 23:20:38,993 INFO L78 Accepts]: Start accepts. Automaton has has 65 states, 65 states have (on average 3.3230769230769233) internal successors, (216), 65 states have internal predecessors, (216), 0 states have call successors, (0), 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 128 [2021-11-20 23:20:38,993 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:20:38,994 INFO L225 Difference]: With dead ends: 276 [2021-11-20 23:20:38,995 INFO L226 Difference]: Without dead ends: 191 [2021-11-20 23:20:38,996 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 445 GetRequests, 353 SyntacticMatches, 0 SemanticMatches, 92 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2325 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=1859, Invalid=6883, Unknown=0, NotChecked=0, Total=8742 [2021-11-20 23:20:38,996 INFO L933 BasicCegarLoop]: 42 mSDtfsCounter, 188 mSDsluCounter, 327 mSDsCounter, 0 mSdLazyCounter, 404 mSolverCounterSat, 193 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 188 SdHoareTripleChecker+Valid, 369 SdHoareTripleChecker+Invalid, 597 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 193 IncrementalHoareTripleChecker+Valid, 404 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-20 23:20:38,996 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [188 Valid, 369 Invalid, 597 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [193 Valid, 404 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-20 23:20:38,997 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 191 states. [2021-11-20 23:20:39,007 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 191 to 131. [2021-11-20 23:20:39,008 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 131 states, 130 states have (on average 1.023076923076923) internal successors, (133), 130 states have internal predecessors, (133), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:20:39,008 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 131 states to 131 states and 133 transitions. [2021-11-20 23:20:39,009 INFO L78 Accepts]: Start accepts. Automaton has 131 states and 133 transitions. Word has length 128 [2021-11-20 23:20:39,009 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:20:39,009 INFO L470 AbstractCegarLoop]: Abstraction has 131 states and 133 transitions. [2021-11-20 23:20:39,009 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 65 states, 65 states have (on average 3.3230769230769233) internal successors, (216), 65 states have internal predecessors, (216), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:20:39,010 INFO L276 IsEmpty]: Start isEmpty. Operand 131 states and 133 transitions. [2021-11-20 23:20:39,010 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 131 [2021-11-20 23:20:39,010 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:20:39,011 INFO L514 BasicCegarLoop]: trace histogram [21, 21, 20, 20, 20, 20, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:20:39,048 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Forceful destruction successful, exit code 0 [2021-11-20 23:20:39,234 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable24 [2021-11-20 23:20:39,235 INFO L402 AbstractCegarLoop]: === Iteration 26 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:20:39,235 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:20:39,235 INFO L85 PathProgramCache]: Analyzing trace with hash -1214666672, now seen corresponding path program 23 times [2021-11-20 23:20:39,235 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:20:39,235 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [490805088] [2021-11-20 23:20:39,235 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:20:39,235 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:20:39,271 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:20:39,845 INFO L134 CoverageAnalysis]: Checked inductivity of 1220 backedges. 743 proven. 477 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:20:39,845 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:20:39,845 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [490805088] [2021-11-20 23:20:39,845 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [490805088] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:20:39,846 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [59692277] [2021-11-20 23:20:39,846 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-20 23:20:39,846 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:20:39,846 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:20:39,847 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:20:39,847 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Waiting until timeout for monitored process [2021-11-20 23:20:39,937 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 21 check-sat command(s) [2021-11-20 23:20:39,938 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:20:39,940 INFO L263 TraceCheckSpWp]: Trace formula consists of 487 conjuncts, 44 conjunts are in the unsatisfiable core [2021-11-20 23:20:39,941 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:20:40,924 INFO L134 CoverageAnalysis]: Checked inductivity of 1220 backedges. 800 proven. 420 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:20:40,925 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:20:41,166 INFO L134 CoverageAnalysis]: Checked inductivity of 1220 backedges. 800 proven. 420 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:20:41,167 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [59692277] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:20:41,167 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1949227601] [2021-11-20 23:20:41,168 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-20 23:20:41,168 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:20:41,168 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:20:41,169 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:20:41,169 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:20:42,536 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:20:43,010 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:20:43,011 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:20:43,011 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [44, 44, 44] total 67 [2021-11-20 23:20:43,011 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1269076549] [2021-11-20 23:20:43,011 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:20:43,011 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 67 states [2021-11-20 23:20:43,012 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:20:43,012 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 67 interpolants. [2021-11-20 23:20:43,012 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1085, Invalid=4615, Unknown=0, NotChecked=0, Total=5700 [2021-11-20 23:20:43,013 INFO L87 Difference]: Start difference. First operand 131 states and 133 transitions. Second operand has 67 states, 67 states have (on average 3.253731343283582) internal successors, (218), 67 states have internal predecessors, (218), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:20:43,608 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:20:43,609 INFO L93 Difference]: Finished difference Result 283 states and 307 transitions. [2021-11-20 23:20:43,609 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2021-11-20 23:20:43,609 INFO L78 Accepts]: Start accepts. Automaton has has 67 states, 67 states have (on average 3.253731343283582) internal successors, (218), 67 states have internal predecessors, (218), 0 states have call successors, (0), 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 130 [2021-11-20 23:20:43,610 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:20:43,611 INFO L225 Difference]: With dead ends: 283 [2021-11-20 23:20:43,611 INFO L226 Difference]: Without dead ends: 196 [2021-11-20 23:20:43,612 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 453 GetRequests, 358 SyntacticMatches, 0 SemanticMatches, 95 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2442 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=2011, Invalid=7301, Unknown=0, NotChecked=0, Total=9312 [2021-11-20 23:20:43,613 INFO L933 BasicCegarLoop]: 44 mSDtfsCounter, 178 mSDsluCounter, 398 mSDsCounter, 0 mSdLazyCounter, 465 mSolverCounterSat, 170 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 178 SdHoareTripleChecker+Valid, 442 SdHoareTripleChecker+Invalid, 635 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 170 IncrementalHoareTripleChecker+Valid, 465 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-20 23:20:43,613 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [178 Valid, 442 Invalid, 635 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [170 Valid, 465 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-20 23:20:43,614 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 196 states. [2021-11-20 23:20:43,624 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 196 to 133. [2021-11-20 23:20:43,624 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 133 states, 132 states have (on average 1.0227272727272727) internal successors, (135), 132 states have internal predecessors, (135), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:20:43,625 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 133 states to 133 states and 135 transitions. [2021-11-20 23:20:43,625 INFO L78 Accepts]: Start accepts. Automaton has 133 states and 135 transitions. Word has length 130 [2021-11-20 23:20:43,625 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:20:43,625 INFO L470 AbstractCegarLoop]: Abstraction has 133 states and 135 transitions. [2021-11-20 23:20:43,626 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 67 states, 67 states have (on average 3.253731343283582) internal successors, (218), 67 states have internal predecessors, (218), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:20:43,626 INFO L276 IsEmpty]: Start isEmpty. Operand 133 states and 135 transitions. [2021-11-20 23:20:43,627 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 133 [2021-11-20 23:20:43,627 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:20:43,627 INFO L514 BasicCegarLoop]: trace histogram [22, 21, 21, 20, 20, 20, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:20:43,665 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Forceful destruction successful, exit code 0 [2021-11-20 23:20:43,842 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable25 [2021-11-20 23:20:43,843 INFO L402 AbstractCegarLoop]: === Iteration 27 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:20:43,843 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:20:43,843 INFO L85 PathProgramCache]: Analyzing trace with hash -1764652939, now seen corresponding path program 24 times [2021-11-20 23:20:43,843 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:20:43,843 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [392402034] [2021-11-20 23:20:43,843 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:20:43,844 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:20:43,890 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:20:44,218 INFO L134 CoverageAnalysis]: Checked inductivity of 1262 backedges. 420 proven. 842 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:20:44,218 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:20:44,218 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [392402034] [2021-11-20 23:20:44,218 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [392402034] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:20:44,219 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1204479043] [2021-11-20 23:20:44,219 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-20 23:20:44,219 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:20:44,219 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:20:44,220 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:20:44,234 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Waiting until timeout for monitored process [2021-11-20 23:20:44,319 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-20 23:20:44,319 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:20:44,322 INFO L263 TraceCheckSpWp]: Trace formula consists of 497 conjuncts, 45 conjunts are in the unsatisfiable core [2021-11-20 23:20:44,324 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:20:44,691 INFO L134 CoverageAnalysis]: Checked inductivity of 1262 backedges. 462 proven. 800 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:20:44,691 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:20:44,981 INFO L134 CoverageAnalysis]: Checked inductivity of 1262 backedges. 462 proven. 800 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:20:44,982 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1204479043] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:20:44,982 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [667460322] [2021-11-20 23:20:44,984 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-20 23:20:44,984 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:20:44,984 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:20:44,985 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:20:44,985 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:20:46,353 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:20:46,672 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:20:46,672 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:20:46,673 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24, 24] total 27 [2021-11-20 23:20:46,673 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [124724633] [2021-11-20 23:20:46,673 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:20:46,673 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2021-11-20 23:20:46,673 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:20:46,674 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2021-11-20 23:20:46,674 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=355, Invalid=977, Unknown=0, NotChecked=0, Total=1332 [2021-11-20 23:20:46,674 INFO L87 Difference]: Start difference. First operand 133 states and 135 transitions. Second operand has 28 states, 28 states have (on average 5.464285714285714) internal successors, (153), 27 states have internal predecessors, (153), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:20:47,087 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:20:47,087 INFO L93 Difference]: Finished difference Result 150 states and 153 transitions. [2021-11-20 23:20:47,087 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2021-11-20 23:20:47,087 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 28 states have (on average 5.464285714285714) internal successors, (153), 27 states have internal predecessors, (153), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 132 [2021-11-20 23:20:47,087 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:20:47,088 INFO L225 Difference]: With dead ends: 150 [2021-11-20 23:20:47,088 INFO L226 Difference]: Without dead ends: 148 [2021-11-20 23:20:47,088 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 462 GetRequests, 402 SyntacticMatches, 1 SemanticMatches, 59 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1051 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=1008, Invalid=2652, Unknown=0, NotChecked=0, Total=3660 [2021-11-20 23:20:47,089 INFO L933 BasicCegarLoop]: 30 mSDtfsCounter, 171 mSDsluCounter, 167 mSDsCounter, 0 mSdLazyCounter, 210 mSolverCounterSat, 115 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 171 SdHoareTripleChecker+Valid, 191 SdHoareTripleChecker+Invalid, 325 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 115 IncrementalHoareTripleChecker+Valid, 210 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-20 23:20:47,089 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [171 Valid, 191 Invalid, 325 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [115 Valid, 210 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-20 23:20:47,090 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 148 states. [2021-11-20 23:20:47,099 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 148 to 141. [2021-11-20 23:20:47,099 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 141 states, 140 states have (on average 1.0214285714285714) internal successors, (143), 140 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 23:20:47,099 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 141 states to 141 states and 143 transitions. [2021-11-20 23:20:47,100 INFO L78 Accepts]: Start accepts. Automaton has 141 states and 143 transitions. Word has length 132 [2021-11-20 23:20:47,100 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:20:47,100 INFO L470 AbstractCegarLoop]: Abstraction has 141 states and 143 transitions. [2021-11-20 23:20:47,100 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 28 states, 28 states have (on average 5.464285714285714) internal successors, (153), 27 states have internal predecessors, (153), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:20:47,101 INFO L276 IsEmpty]: Start isEmpty. Operand 141 states and 143 transitions. [2021-11-20 23:20:47,101 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 141 [2021-11-20 23:20:47,101 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:20:47,102 INFO L514 BasicCegarLoop]: trace histogram [23, 22, 22, 22, 22, 21, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:20:47,138 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Forceful destruction successful, exit code 0 [2021-11-20 23:20:47,314 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable26 [2021-11-20 23:20:47,315 INFO L402 AbstractCegarLoop]: === Iteration 28 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:20:47,315 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:20:47,315 INFO L85 PathProgramCache]: Analyzing trace with hash -35875493, now seen corresponding path program 25 times [2021-11-20 23:20:47,315 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:20:47,315 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [772113318] [2021-11-20 23:20:47,315 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:20:47,316 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:20:47,354 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:20:48,143 INFO L134 CoverageAnalysis]: Checked inductivity of 1430 backedges. 905 proven. 525 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:20:48,143 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:20:48,143 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [772113318] [2021-11-20 23:20:48,144 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [772113318] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:20:48,144 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [398290330] [2021-11-20 23:20:48,144 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-20 23:20:48,144 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:20:48,144 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:20:48,147 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:20:48,168 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Waiting until timeout for monitored process [2021-11-20 23:20:48,244 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:20:48,247 INFO L263 TraceCheckSpWp]: Trace formula consists of 521 conjuncts, 46 conjunts are in the unsatisfiable core [2021-11-20 23:20:48,250 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:20:49,423 INFO L134 CoverageAnalysis]: Checked inductivity of 1430 backedges. 966 proven. 462 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-20 23:20:49,423 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:20:49,711 INFO L134 CoverageAnalysis]: Checked inductivity of 1430 backedges. 966 proven. 462 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-20 23:20:49,711 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [398290330] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:20:49,711 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1847862116] [2021-11-20 23:20:49,712 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-20 23:20:49,713 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:20:49,713 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:20:49,713 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:20:49,713 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:20:51,028 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:20:51,529 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:20:51,529 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:20:51,529 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [47, 46, 46] total 71 [2021-11-20 23:20:51,529 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [68152587] [2021-11-20 23:20:51,529 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:20:51,530 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 71 states [2021-11-20 23:20:51,530 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:20:51,530 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 71 interpolants. [2021-11-20 23:20:51,531 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1203, Invalid=5117, Unknown=0, NotChecked=0, Total=6320 [2021-11-20 23:20:51,531 INFO L87 Difference]: Start difference. First operand 141 states and 143 transitions. Second operand has 71 states, 71 states have (on average 3.323943661971831) internal successors, (236), 71 states have internal predecessors, (236), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:20:52,271 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:20:52,271 INFO L93 Difference]: Finished difference Result 302 states and 327 transitions. [2021-11-20 23:20:52,272 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2021-11-20 23:20:52,272 INFO L78 Accepts]: Start accepts. Automaton has has 71 states, 71 states have (on average 3.323943661971831) internal successors, (236), 71 states have internal predecessors, (236), 0 states have call successors, (0), 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 140 [2021-11-20 23:20:52,272 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:20:52,273 INFO L225 Difference]: With dead ends: 302 [2021-11-20 23:20:52,274 INFO L226 Difference]: Without dead ends: 209 [2021-11-20 23:20:52,275 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 487 GetRequests, 387 SyntacticMatches, 0 SemanticMatches, 100 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2710 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=2217, Invalid=8085, Unknown=0, NotChecked=0, Total=10302 [2021-11-20 23:20:52,276 INFO L933 BasicCegarLoop]: 46 mSDtfsCounter, 178 mSDsluCounter, 368 mSDsCounter, 0 mSdLazyCounter, 440 mSolverCounterSat, 149 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 178 SdHoareTripleChecker+Valid, 414 SdHoareTripleChecker+Invalid, 589 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 149 IncrementalHoareTripleChecker+Valid, 440 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-20 23:20:52,276 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [178 Valid, 414 Invalid, 589 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [149 Valid, 440 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-20 23:20:52,277 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 209 states. [2021-11-20 23:20:52,291 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 209 to 143. [2021-11-20 23:20:52,292 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 143 states, 142 states have (on average 1.0211267605633803) internal successors, (145), 142 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 23:20:52,293 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 143 states to 143 states and 145 transitions. [2021-11-20 23:20:52,293 INFO L78 Accepts]: Start accepts. Automaton has 143 states and 145 transitions. Word has length 140 [2021-11-20 23:20:52,293 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:20:52,293 INFO L470 AbstractCegarLoop]: Abstraction has 143 states and 145 transitions. [2021-11-20 23:20:52,294 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 71 states, 71 states have (on average 3.323943661971831) internal successors, (236), 71 states have internal predecessors, (236), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:20:52,294 INFO L276 IsEmpty]: Start isEmpty. Operand 143 states and 145 transitions. [2021-11-20 23:20:52,295 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 143 [2021-11-20 23:20:52,295 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:20:52,295 INFO L514 BasicCegarLoop]: trace histogram [23, 23, 22, 22, 22, 22, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:20:52,331 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Forceful destruction successful, exit code 0 [2021-11-20 23:20:52,522 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable27 [2021-11-20 23:20:52,523 INFO L402 AbstractCegarLoop]: === Iteration 29 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:20:52,523 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:20:52,523 INFO L85 PathProgramCache]: Analyzing trace with hash 634014528, now seen corresponding path program 26 times [2021-11-20 23:20:52,523 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:20:52,523 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [865920361] [2021-11-20 23:20:52,523 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:20:52,523 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:20:52,564 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:20:53,358 INFO L134 CoverageAnalysis]: Checked inductivity of 1474 backedges. 905 proven. 569 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:20:53,358 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:20:53,358 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [865920361] [2021-11-20 23:20:53,358 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [865920361] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:20:53,358 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1049173038] [2021-11-20 23:20:53,358 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-20 23:20:53,359 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:20:53,359 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:20:53,361 INFO L229 MonitoredProcess]: Starting monitored process 27 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:20:53,362 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Waiting until timeout for monitored process [2021-11-20 23:20:53,465 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 23 check-sat command(s) [2021-11-20 23:20:53,465 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:20:53,468 INFO L263 TraceCheckSpWp]: Trace formula consists of 531 conjuncts, 48 conjunts are in the unsatisfiable core [2021-11-20 23:20:53,474 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:20:54,623 INFO L134 CoverageAnalysis]: Checked inductivity of 1474 backedges. 968 proven. 506 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:20:54,623 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:20:54,994 INFO L134 CoverageAnalysis]: Checked inductivity of 1474 backedges. 968 proven. 506 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:20:54,994 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1049173038] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:20:54,994 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [815803126] [2021-11-20 23:20:54,996 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-20 23:20:54,996 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:20:54,996 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:20:54,996 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:20:54,996 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:20:56,271 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:20:56,777 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:20:56,777 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:20:56,778 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [48, 48, 48] total 73 [2021-11-20 23:20:56,778 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1401302834] [2021-11-20 23:20:56,778 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:20:56,778 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 73 states [2021-11-20 23:20:56,778 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:20:56,779 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 73 interpolants. [2021-11-20 23:20:56,780 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1277, Invalid=5365, Unknown=0, NotChecked=0, Total=6642 [2021-11-20 23:20:56,780 INFO L87 Difference]: Start difference. First operand 143 states and 145 transitions. Second operand has 73 states, 73 states have (on average 3.26027397260274) internal successors, (238), 73 states have internal predecessors, (238), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:20:57,449 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:20:57,449 INFO L93 Difference]: Finished difference Result 309 states and 335 transitions. [2021-11-20 23:20:57,449 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2021-11-20 23:20:57,449 INFO L78 Accepts]: Start accepts. Automaton has has 73 states, 73 states have (on average 3.26027397260274) internal successors, (238), 73 states have internal predecessors, (238), 0 states have call successors, (0), 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 142 [2021-11-20 23:20:57,449 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:20:57,450 INFO L225 Difference]: With dead ends: 309 [2021-11-20 23:20:57,450 INFO L226 Difference]: Without dead ends: 214 [2021-11-20 23:20:57,451 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 495 GetRequests, 392 SyntacticMatches, 0 SemanticMatches, 103 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2835 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=2383, Invalid=8537, Unknown=0, NotChecked=0, Total=10920 [2021-11-20 23:20:57,452 INFO L933 BasicCegarLoop]: 48 mSDtfsCounter, 210 mSDsluCounter, 423 mSDsCounter, 0 mSdLazyCounter, 502 mSolverCounterSat, 193 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 210 SdHoareTripleChecker+Valid, 471 SdHoareTripleChecker+Invalid, 695 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 193 IncrementalHoareTripleChecker+Valid, 502 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-20 23:20:57,452 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [210 Valid, 471 Invalid, 695 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [193 Valid, 502 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-20 23:20:57,453 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 214 states. [2021-11-20 23:20:57,466 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 214 to 145. [2021-11-20 23:20:57,466 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 145 states, 144 states have (on average 1.0208333333333333) internal successors, (147), 144 states have internal predecessors, (147), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:20:57,467 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 145 states to 145 states and 147 transitions. [2021-11-20 23:20:57,467 INFO L78 Accepts]: Start accepts. Automaton has 145 states and 147 transitions. Word has length 142 [2021-11-20 23:20:57,467 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:20:57,468 INFO L470 AbstractCegarLoop]: Abstraction has 145 states and 147 transitions. [2021-11-20 23:20:57,468 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 73 states, 73 states have (on average 3.26027397260274) internal successors, (238), 73 states have internal predecessors, (238), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:20:57,468 INFO L276 IsEmpty]: Start isEmpty. Operand 145 states and 147 transitions. [2021-11-20 23:20:57,469 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 145 [2021-11-20 23:20:57,469 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:20:57,469 INFO L514 BasicCegarLoop]: trace histogram [24, 23, 23, 22, 22, 22, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:20:57,502 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Forceful destruction successful, exit code 0 [2021-11-20 23:20:57,688 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable28 [2021-11-20 23:20:57,689 INFO L402 AbstractCegarLoop]: === Iteration 30 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:20:57,689 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:20:57,689 INFO L85 PathProgramCache]: Analyzing trace with hash 153230309, now seen corresponding path program 27 times [2021-11-20 23:20:57,689 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:20:57,689 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [886671901] [2021-11-20 23:20:57,689 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:20:57,689 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:20:57,730 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:20:58,096 INFO L134 CoverageAnalysis]: Checked inductivity of 1520 backedges. 506 proven. 1014 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:20:58,096 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:20:58,096 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [886671901] [2021-11-20 23:20:58,097 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [886671901] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:20:58,097 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1718485898] [2021-11-20 23:20:58,097 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-20 23:20:58,097 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:20:58,097 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:20:58,099 INFO L229 MonitoredProcess]: Starting monitored process 28 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:20:58,122 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Waiting until timeout for monitored process [2021-11-20 23:20:58,213 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-20 23:20:58,213 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:20:58,216 INFO L263 TraceCheckSpWp]: Trace formula consists of 541 conjuncts, 49 conjunts are in the unsatisfiable core [2021-11-20 23:20:58,219 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:20:58,531 INFO L134 CoverageAnalysis]: Checked inductivity of 1520 backedges. 552 proven. 968 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:20:58,532 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:20:58,838 INFO L134 CoverageAnalysis]: Checked inductivity of 1520 backedges. 552 proven. 968 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:20:58,838 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1718485898] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:20:58,838 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [140643031] [2021-11-20 23:20:58,839 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-20 23:20:58,840 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:20:58,840 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:20:58,840 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:20:58,840 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:21:00,185 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:21:00,532 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:21:00,532 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:21:00,533 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26, 26] total 29 [2021-11-20 23:21:00,533 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [115068961] [2021-11-20 23:21:00,533 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:21:00,533 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 30 states [2021-11-20 23:21:00,533 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:21:00,533 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2021-11-20 23:21:00,534 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=406, Invalid=1076, Unknown=0, NotChecked=0, Total=1482 [2021-11-20 23:21:00,534 INFO L87 Difference]: Start difference. First operand 145 states and 147 transitions. Second operand has 30 states, 30 states have (on average 5.5) internal successors, (165), 29 states have internal predecessors, (165), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:21:00,944 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:21:00,944 INFO L93 Difference]: Finished difference Result 162 states and 165 transitions. [2021-11-20 23:21:00,945 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 54 states. [2021-11-20 23:21:00,945 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 30 states have (on average 5.5) internal successors, (165), 29 states have internal predecessors, (165), 0 states have call successors, (0), 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 144 [2021-11-20 23:21:00,945 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:21:00,946 INFO L225 Difference]: With dead ends: 162 [2021-11-20 23:21:00,946 INFO L226 Difference]: Without dead ends: 160 [2021-11-20 23:21:00,946 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 504 GetRequests, 440 SyntacticMatches, 1 SemanticMatches, 63 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1191 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=1165, Invalid=2995, Unknown=0, NotChecked=0, Total=4160 [2021-11-20 23:21:00,947 INFO L933 BasicCegarLoop]: 32 mSDtfsCounter, 132 mSDsluCounter, 198 mSDsCounter, 0 mSdLazyCounter, 253 mSolverCounterSat, 101 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 132 SdHoareTripleChecker+Valid, 224 SdHoareTripleChecker+Invalid, 354 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 101 IncrementalHoareTripleChecker+Valid, 253 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-20 23:21:00,947 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [132 Valid, 224 Invalid, 354 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [101 Valid, 253 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-20 23:21:00,948 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 160 states. [2021-11-20 23:21:00,960 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 160 to 153. [2021-11-20 23:21:00,961 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 153 states, 152 states have (on average 1.019736842105263) internal successors, (155), 152 states have internal predecessors, (155), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:21:00,962 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 153 states to 153 states and 155 transitions. [2021-11-20 23:21:00,962 INFO L78 Accepts]: Start accepts. Automaton has 153 states and 155 transitions. Word has length 144 [2021-11-20 23:21:00,962 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:21:00,962 INFO L470 AbstractCegarLoop]: Abstraction has 153 states and 155 transitions. [2021-11-20 23:21:00,963 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 30 states, 30 states have (on average 5.5) internal successors, (165), 29 states have internal predecessors, (165), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:21:00,963 INFO L276 IsEmpty]: Start isEmpty. Operand 153 states and 155 transitions. [2021-11-20 23:21:00,963 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 153 [2021-11-20 23:21:00,964 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:21:00,964 INFO L514 BasicCegarLoop]: trace histogram [25, 24, 24, 24, 24, 23, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:21:00,986 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Forceful destruction successful, exit code 0 [2021-11-20 23:21:01,170 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29,28 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:21:01,171 INFO L402 AbstractCegarLoop]: === Iteration 31 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:21:01,171 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:21:01,171 INFO L85 PathProgramCache]: Analyzing trace with hash 1239070923, now seen corresponding path program 28 times [2021-11-20 23:21:01,171 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:21:01,171 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1005018863] [2021-11-20 23:21:01,171 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:21:01,171 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:21:01,205 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:21:01,937 INFO L134 CoverageAnalysis]: Checked inductivity of 1704 backedges. 1083 proven. 621 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:21:01,937 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:21:01,937 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1005018863] [2021-11-20 23:21:01,937 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1005018863] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:21:01,937 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [198880401] [2021-11-20 23:21:01,937 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-20 23:21:01,937 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:21:01,937 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:21:01,938 INFO L229 MonitoredProcess]: Starting monitored process 29 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:21:01,939 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Waiting until timeout for monitored process [2021-11-20 23:21:02,016 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:21:02,019 INFO L263 TraceCheckSpWp]: Trace formula consists of 565 conjuncts, 50 conjunts are in the unsatisfiable core [2021-11-20 23:21:02,023 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:21:03,237 INFO L134 CoverageAnalysis]: Checked inductivity of 1704 backedges. 1150 proven. 552 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-20 23:21:03,237 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:21:03,625 INFO L134 CoverageAnalysis]: Checked inductivity of 1704 backedges. 1150 proven. 552 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-20 23:21:03,625 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [198880401] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:21:03,626 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1947537293] [2021-11-20 23:21:03,628 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-20 23:21:03,628 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:21:03,629 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:21:03,629 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:21:03,629 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:21:05,074 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:21:05,581 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:21:05,581 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:21:05,582 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [51, 50, 50] total 77 [2021-11-20 23:21:05,582 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1646222043] [2021-11-20 23:21:05,582 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:21:05,582 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 77 states [2021-11-20 23:21:05,582 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:21:05,583 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 77 interpolants. [2021-11-20 23:21:05,583 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1405, Invalid=5905, Unknown=0, NotChecked=0, Total=7310 [2021-11-20 23:21:05,583 INFO L87 Difference]: Start difference. First operand 153 states and 155 transitions. Second operand has 77 states, 77 states have (on average 3.324675324675325) internal successors, (256), 77 states have internal predecessors, (256), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:21:06,315 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:21:06,315 INFO L93 Difference]: Finished difference Result 328 states and 355 transitions. [2021-11-20 23:21:06,315 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 50 states. [2021-11-20 23:21:06,315 INFO L78 Accepts]: Start accepts. Automaton has has 77 states, 77 states have (on average 3.324675324675325) internal successors, (256), 77 states have internal predecessors, (256), 0 states have call successors, (0), 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 152 [2021-11-20 23:21:06,316 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:21:06,317 INFO L225 Difference]: With dead ends: 328 [2021-11-20 23:21:06,317 INFO L226 Difference]: Without dead ends: 227 [2021-11-20 23:21:06,319 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 529 GetRequests, 421 SyntacticMatches, 0 SemanticMatches, 108 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3123 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=2607, Invalid=9383, Unknown=0, NotChecked=0, Total=11990 [2021-11-20 23:21:06,320 INFO L933 BasicCegarLoop]: 50 mSDtfsCounter, 209 mSDsluCounter, 525 mSDsCounter, 0 mSdLazyCounter, 604 mSolverCounterSat, 195 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 209 SdHoareTripleChecker+Valid, 575 SdHoareTripleChecker+Invalid, 799 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 195 IncrementalHoareTripleChecker+Valid, 604 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-20 23:21:06,320 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [209 Valid, 575 Invalid, 799 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [195 Valid, 604 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-20 23:21:06,321 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 227 states. [2021-11-20 23:21:06,334 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 227 to 155. [2021-11-20 23:21:06,334 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 155 states, 154 states have (on average 1.0194805194805194) internal successors, (157), 154 states have internal predecessors, (157), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:21:06,335 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 155 states to 155 states and 157 transitions. [2021-11-20 23:21:06,335 INFO L78 Accepts]: Start accepts. Automaton has 155 states and 157 transitions. Word has length 152 [2021-11-20 23:21:06,335 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:21:06,336 INFO L470 AbstractCegarLoop]: Abstraction has 155 states and 157 transitions. [2021-11-20 23:21:06,336 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 77 states, 77 states have (on average 3.324675324675325) internal successors, (256), 77 states have internal predecessors, (256), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:21:06,336 INFO L276 IsEmpty]: Start isEmpty. Operand 155 states and 157 transitions. [2021-11-20 23:21:06,337 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 155 [2021-11-20 23:21:06,337 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:21:06,337 INFO L514 BasicCegarLoop]: trace histogram [25, 25, 24, 24, 24, 24, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:21:06,382 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Forceful destruction successful, exit code 0 [2021-11-20 23:21:06,562 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30,29 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:21:06,563 INFO L402 AbstractCegarLoop]: === Iteration 32 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:21:06,563 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:21:06,563 INFO L85 PathProgramCache]: Analyzing trace with hash -183124176, now seen corresponding path program 29 times [2021-11-20 23:21:06,563 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:21:06,563 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [833571483] [2021-11-20 23:21:06,563 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:21:06,564 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:21:06,618 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:21:07,387 INFO L134 CoverageAnalysis]: Checked inductivity of 1752 backedges. 1083 proven. 669 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:21:07,387 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:21:07,387 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [833571483] [2021-11-20 23:21:07,387 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [833571483] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:21:07,387 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1840138747] [2021-11-20 23:21:07,388 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-20 23:21:07,388 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:21:07,388 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:21:07,412 INFO L229 MonitoredProcess]: Starting monitored process 30 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:21:07,413 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Waiting until timeout for monitored process [2021-11-20 23:21:07,527 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 25 check-sat command(s) [2021-11-20 23:21:07,528 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:21:07,531 INFO L263 TraceCheckSpWp]: Trace formula consists of 575 conjuncts, 52 conjunts are in the unsatisfiable core [2021-11-20 23:21:07,533 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:21:08,856 INFO L134 CoverageAnalysis]: Checked inductivity of 1752 backedges. 1152 proven. 600 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:21:08,865 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:21:09,153 INFO L134 CoverageAnalysis]: Checked inductivity of 1752 backedges. 1152 proven. 600 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:21:09,153 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1840138747] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:21:09,153 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1412155587] [2021-11-20 23:21:09,154 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-20 23:21:09,155 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:21:09,155 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:21:09,155 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:21:09,155 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:21:10,445 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:21:10,978 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:21:10,978 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:21:10,978 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [52, 52, 52] total 79 [2021-11-20 23:21:10,978 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1921641123] [2021-11-20 23:21:10,978 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:21:10,979 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 79 states [2021-11-20 23:21:10,979 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:21:10,980 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 79 interpolants. [2021-11-20 23:21:10,980 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1485, Invalid=6171, Unknown=0, NotChecked=0, Total=7656 [2021-11-20 23:21:10,980 INFO L87 Difference]: Start difference. First operand 155 states and 157 transitions. Second operand has 79 states, 79 states have (on average 3.2658227848101267) internal successors, (258), 79 states have internal predecessors, (258), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:21:11,784 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:21:11,784 INFO L93 Difference]: Finished difference Result 335 states and 363 transitions. [2021-11-20 23:21:11,784 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2021-11-20 23:21:11,784 INFO L78 Accepts]: Start accepts. Automaton has has 79 states, 79 states have (on average 3.2658227848101267) internal successors, (258), 79 states have internal predecessors, (258), 0 states have call successors, (0), 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 154 [2021-11-20 23:21:11,785 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:21:11,786 INFO L225 Difference]: With dead ends: 335 [2021-11-20 23:21:11,786 INFO L226 Difference]: Without dead ends: 232 [2021-11-20 23:21:11,787 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 537 GetRequests, 426 SyntacticMatches, 0 SemanticMatches, 111 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3256 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=2787, Invalid=9869, Unknown=0, NotChecked=0, Total=12656 [2021-11-20 23:21:11,787 INFO L933 BasicCegarLoop]: 52 mSDtfsCounter, 204 mSDsluCounter, 524 mSDsCounter, 0 mSdLazyCounter, 609 mSolverCounterSat, 197 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 204 SdHoareTripleChecker+Valid, 576 SdHoareTripleChecker+Invalid, 806 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 197 IncrementalHoareTripleChecker+Valid, 609 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-20 23:21:11,787 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [204 Valid, 576 Invalid, 806 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [197 Valid, 609 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-20 23:21:11,788 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 232 states. [2021-11-20 23:21:11,801 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 232 to 157. [2021-11-20 23:21:11,801 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 157 states, 156 states have (on average 1.0192307692307692) internal successors, (159), 156 states have internal predecessors, (159), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:21:11,802 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 157 states to 157 states and 159 transitions. [2021-11-20 23:21:11,802 INFO L78 Accepts]: Start accepts. Automaton has 157 states and 159 transitions. Word has length 154 [2021-11-20 23:21:11,802 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:21:11,803 INFO L470 AbstractCegarLoop]: Abstraction has 157 states and 159 transitions. [2021-11-20 23:21:11,803 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 79 states, 79 states have (on average 3.2658227848101267) internal successors, (258), 79 states have internal predecessors, (258), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:21:11,803 INFO L276 IsEmpty]: Start isEmpty. Operand 157 states and 159 transitions. [2021-11-20 23:21:11,804 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 157 [2021-11-20 23:21:11,804 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:21:11,804 INFO L514 BasicCegarLoop]: trace histogram [26, 25, 25, 24, 24, 24, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:21:11,839 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Forceful destruction successful, exit code 0 [2021-11-20 23:21:12,018 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31,30 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:21:12,019 INFO L402 AbstractCegarLoop]: === Iteration 33 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:21:12,019 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:21:12,019 INFO L85 PathProgramCache]: Analyzing trace with hash -1113014187, now seen corresponding path program 30 times [2021-11-20 23:21:12,019 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:21:12,019 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [883126804] [2021-11-20 23:21:12,019 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:21:12,020 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:21:12,063 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:21:12,480 INFO L134 CoverageAnalysis]: Checked inductivity of 1802 backedges. 600 proven. 1202 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:21:12,481 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:21:12,481 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [883126804] [2021-11-20 23:21:12,481 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [883126804] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:21:12,481 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1715354138] [2021-11-20 23:21:12,481 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-20 23:21:12,481 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:21:12,481 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:21:12,482 INFO L229 MonitoredProcess]: Starting monitored process 31 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:21:12,501 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Waiting until timeout for monitored process [2021-11-20 23:21:12,587 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-20 23:21:12,587 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:21:12,589 INFO L263 TraceCheckSpWp]: Trace formula consists of 585 conjuncts, 53 conjunts are in the unsatisfiable core [2021-11-20 23:21:12,593 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:21:12,904 INFO L134 CoverageAnalysis]: Checked inductivity of 1802 backedges. 650 proven. 1152 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:21:12,904 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:21:13,199 INFO L134 CoverageAnalysis]: Checked inductivity of 1802 backedges. 650 proven. 1152 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:21:13,200 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1715354138] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:21:13,200 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1670739952] [2021-11-20 23:21:13,201 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-20 23:21:13,201 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:21:13,201 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:21:13,202 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:21:13,202 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:21:14,486 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:21:14,821 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:21:14,821 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:21:14,821 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [28, 28, 28] total 31 [2021-11-20 23:21:14,821 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [521324387] [2021-11-20 23:21:14,821 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:21:14,822 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2021-11-20 23:21:14,822 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:21:14,822 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2021-11-20 23:21:14,822 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=461, Invalid=1179, Unknown=0, NotChecked=0, Total=1640 [2021-11-20 23:21:14,822 INFO L87 Difference]: Start difference. First operand 157 states and 159 transitions. Second operand has 32 states, 32 states have (on average 5.53125) internal successors, (177), 31 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 23:21:15,269 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:21:15,269 INFO L93 Difference]: Finished difference Result 174 states and 177 transitions. [2021-11-20 23:21:15,269 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 58 states. [2021-11-20 23:21:15,269 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 5.53125) internal successors, (177), 31 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 156 [2021-11-20 23:21:15,269 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:21:15,270 INFO L225 Difference]: With dead ends: 174 [2021-11-20 23:21:15,271 INFO L226 Difference]: Without dead ends: 172 [2021-11-20 23:21:15,271 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 546 GetRequests, 478 SyntacticMatches, 1 SemanticMatches, 67 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1339 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=1334, Invalid=3358, Unknown=0, NotChecked=0, Total=4692 [2021-11-20 23:21:15,272 INFO L933 BasicCegarLoop]: 34 mSDtfsCounter, 204 mSDsluCounter, 186 mSDsCounter, 0 mSdLazyCounter, 253 mSolverCounterSat, 135 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 204 SdHoareTripleChecker+Valid, 216 SdHoareTripleChecker+Invalid, 388 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 135 IncrementalHoareTripleChecker+Valid, 253 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-20 23:21:15,272 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [204 Valid, 216 Invalid, 388 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [135 Valid, 253 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-20 23:21:15,273 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 172 states. [2021-11-20 23:21:15,281 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 172 to 165. [2021-11-20 23:21:15,282 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 165 states, 164 states have (on average 1.0182926829268293) internal successors, (167), 164 states have internal predecessors, (167), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:21:15,282 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 165 states to 165 states and 167 transitions. [2021-11-20 23:21:15,283 INFO L78 Accepts]: Start accepts. Automaton has 165 states and 167 transitions. Word has length 156 [2021-11-20 23:21:15,283 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:21:15,283 INFO L470 AbstractCegarLoop]: Abstraction has 165 states and 167 transitions. [2021-11-20 23:21:15,284 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 32 states have (on average 5.53125) internal successors, (177), 31 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 23:21:15,284 INFO L276 IsEmpty]: Start isEmpty. Operand 165 states and 167 transitions. [2021-11-20 23:21:15,284 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 165 [2021-11-20 23:21:15,285 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:21:15,285 INFO L514 BasicCegarLoop]: trace histogram [27, 26, 26, 26, 26, 25, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:21:15,312 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Forceful destruction successful, exit code 0 [2021-11-20 23:21:15,499 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 31 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable32 [2021-11-20 23:21:15,499 INFO L402 AbstractCegarLoop]: === Iteration 34 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:21:15,500 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:21:15,500 INFO L85 PathProgramCache]: Analyzing trace with hash -848433861, now seen corresponding path program 31 times [2021-11-20 23:21:15,500 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:21:15,500 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1693237007] [2021-11-20 23:21:15,500 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:21:15,500 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:21:15,554 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:21:16,525 INFO L134 CoverageAnalysis]: Checked inductivity of 2002 backedges. 1277 proven. 725 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:21:16,526 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:21:16,526 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1693237007] [2021-11-20 23:21:16,526 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1693237007] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:21:16,526 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1439187184] [2021-11-20 23:21:16,526 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-20 23:21:16,526 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:21:16,526 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:21:16,527 INFO L229 MonitoredProcess]: Starting monitored process 32 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:21:16,528 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Waiting until timeout for monitored process [2021-11-20 23:21:16,621 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:21:16,623 INFO L263 TraceCheckSpWp]: Trace formula consists of 609 conjuncts, 54 conjunts are in the unsatisfiable core [2021-11-20 23:21:16,625 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:21:18,017 INFO L134 CoverageAnalysis]: Checked inductivity of 2002 backedges. 1350 proven. 650 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-20 23:21:18,017 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:21:18,319 INFO L134 CoverageAnalysis]: Checked inductivity of 2002 backedges. 1350 proven. 650 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-20 23:21:18,320 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1439187184] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:21:18,320 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1444423670] [2021-11-20 23:21:18,321 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-20 23:21:18,321 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:21:18,321 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:21:18,321 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:21:18,321 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:21:19,652 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:21:20,189 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:21:20,189 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:21:20,189 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [55, 54, 54] total 83 [2021-11-20 23:21:20,189 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [328057679] [2021-11-20 23:21:20,189 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:21:20,190 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 83 states [2021-11-20 23:21:20,190 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:21:20,190 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 83 interpolants. [2021-11-20 23:21:20,191 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1623, Invalid=6749, Unknown=0, NotChecked=0, Total=8372 [2021-11-20 23:21:20,191 INFO L87 Difference]: Start difference. First operand 165 states and 167 transitions. Second operand has 83 states, 83 states have (on average 3.325301204819277) internal successors, (276), 83 states have internal predecessors, (276), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:21:21,006 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:21:21,006 INFO L93 Difference]: Finished difference Result 354 states and 383 transitions. [2021-11-20 23:21:21,006 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 54 states. [2021-11-20 23:21:21,006 INFO L78 Accepts]: Start accepts. Automaton has has 83 states, 83 states have (on average 3.325301204819277) internal successors, (276), 83 states have internal predecessors, (276), 0 states have call successors, (0), 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 164 [2021-11-20 23:21:21,007 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:21:21,008 INFO L225 Difference]: With dead ends: 354 [2021-11-20 23:21:21,008 INFO L226 Difference]: Without dead ends: 245 [2021-11-20 23:21:21,010 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 571 GetRequests, 455 SyntacticMatches, 0 SemanticMatches, 116 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3564 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=3029, Invalid=10777, Unknown=0, NotChecked=0, Total=13806 [2021-11-20 23:21:21,010 INFO L933 BasicCegarLoop]: 54 mSDtfsCounter, 226 mSDsluCounter, 546 mSDsCounter, 0 mSdLazyCounter, 635 mSolverCounterSat, 183 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 226 SdHoareTripleChecker+Valid, 600 SdHoareTripleChecker+Invalid, 818 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 183 IncrementalHoareTripleChecker+Valid, 635 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-20 23:21:21,011 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [226 Valid, 600 Invalid, 818 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [183 Valid, 635 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-20 23:21:21,011 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 245 states. [2021-11-20 23:21:21,026 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 245 to 167. [2021-11-20 23:21:21,026 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 167 states, 166 states have (on average 1.0180722891566265) internal successors, (169), 166 states have internal predecessors, (169), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:21:21,027 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 167 states to 167 states and 169 transitions. [2021-11-20 23:21:21,027 INFO L78 Accepts]: Start accepts. Automaton has 167 states and 169 transitions. Word has length 164 [2021-11-20 23:21:21,027 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:21:21,027 INFO L470 AbstractCegarLoop]: Abstraction has 167 states and 169 transitions. [2021-11-20 23:21:21,027 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 83 states, 83 states have (on average 3.325301204819277) internal successors, (276), 83 states have internal predecessors, (276), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:21:21,027 INFO L276 IsEmpty]: Start isEmpty. Operand 167 states and 169 transitions. [2021-11-20 23:21:21,028 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 167 [2021-11-20 23:21:21,028 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:21:21,028 INFO L514 BasicCegarLoop]: trace histogram [27, 27, 26, 26, 26, 26, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:21:21,049 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Forceful destruction successful, exit code 0 [2021-11-20 23:21:21,228 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 32 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable33 [2021-11-20 23:21:21,228 INFO L402 AbstractCegarLoop]: === Iteration 35 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:21:21,229 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:21:21,229 INFO L85 PathProgramCache]: Analyzing trace with hash -1543404512, now seen corresponding path program 32 times [2021-11-20 23:21:21,229 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:21:21,229 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2137784627] [2021-11-20 23:21:21,229 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:21:21,229 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:21:21,278 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:21:22,257 INFO L134 CoverageAnalysis]: Checked inductivity of 2054 backedges. 1277 proven. 777 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:21:22,257 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:21:22,257 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2137784627] [2021-11-20 23:21:22,258 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2137784627] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:21:22,258 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1939339835] [2021-11-20 23:21:22,258 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-20 23:21:22,258 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:21:22,258 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:21:22,259 INFO L229 MonitoredProcess]: Starting monitored process 33 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:21:22,259 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Waiting until timeout for monitored process [2021-11-20 23:21:22,377 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 27 check-sat command(s) [2021-11-20 23:21:22,377 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:21:22,380 INFO L263 TraceCheckSpWp]: Trace formula consists of 619 conjuncts, 56 conjunts are in the unsatisfiable core [2021-11-20 23:21:22,383 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:21:23,441 INFO L134 CoverageAnalysis]: Checked inductivity of 2054 backedges. 702 proven. 1352 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:21:23,441 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:21:23,770 INFO L134 CoverageAnalysis]: Checked inductivity of 2054 backedges. 702 proven. 1352 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:21:23,771 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1939339835] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:21:23,771 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [29995583] [2021-11-20 23:21:23,772 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-20 23:21:23,772 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:21:23,772 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:21:23,772 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:21:23,773 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:21:25,114 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:21:25,667 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:21:25,667 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:21:25,668 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [56, 29, 29] total 84 [2021-11-20 23:21:25,668 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [821286243] [2021-11-20 23:21:25,668 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:21:25,668 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 84 states [2021-11-20 23:21:25,669 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:21:25,669 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 84 interpolants. [2021-11-20 23:21:25,669 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1279, Invalid=7277, Unknown=0, NotChecked=0, Total=8556 [2021-11-20 23:21:25,669 INFO L87 Difference]: Start difference. First operand 167 states and 169 transitions. Second operand has 84 states, 84 states have (on average 3.9404761904761907) internal successors, (331), 84 states have internal predecessors, (331), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:21:28,297 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:21:28,297 INFO L93 Difference]: Finished difference Result 368 states and 399 transitions. [2021-11-20 23:21:28,297 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 113 states. [2021-11-20 23:21:28,298 INFO L78 Accepts]: Start accepts. Automaton has has 84 states, 84 states have (on average 3.9404761904761907) internal successors, (331), 84 states have internal predecessors, (331), 0 states have call successors, (0), 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 166 [2021-11-20 23:21:28,298 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:21:28,299 INFO L225 Difference]: With dead ends: 368 [2021-11-20 23:21:28,299 INFO L226 Difference]: Without dead ends: 257 [2021-11-20 23:21:28,301 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 687 GetRequests, 487 SyntacticMatches, 1 SemanticMatches, 199 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13642 ImplicationChecksByTransitivity, 3.9s TimeCoverageRelationStatistics Valid=6088, Invalid=34112, Unknown=0, NotChecked=0, Total=40200 [2021-11-20 23:21:28,302 INFO L933 BasicCegarLoop]: 30 mSDtfsCounter, 418 mSDsluCounter, 436 mSDsCounter, 0 mSdLazyCounter, 1770 mSolverCounterSat, 477 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 418 SdHoareTripleChecker+Valid, 465 SdHoareTripleChecker+Invalid, 2247 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 477 IncrementalHoareTripleChecker+Valid, 1770 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2021-11-20 23:21:28,302 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [418 Valid, 465 Invalid, 2247 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [477 Valid, 1770 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2021-11-20 23:21:28,303 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 257 states. [2021-11-20 23:21:28,318 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 257 to 173. [2021-11-20 23:21:28,318 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 173 states, 172 states have (on average 1.0174418604651163) internal successors, (175), 172 states have internal predecessors, (175), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:21:28,319 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 173 states to 173 states and 175 transitions. [2021-11-20 23:21:28,319 INFO L78 Accepts]: Start accepts. Automaton has 173 states and 175 transitions. Word has length 166 [2021-11-20 23:21:28,319 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:21:28,319 INFO L470 AbstractCegarLoop]: Abstraction has 173 states and 175 transitions. [2021-11-20 23:21:28,320 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 84 states, 84 states have (on average 3.9404761904761907) internal successors, (331), 84 states have internal predecessors, (331), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:21:28,320 INFO L276 IsEmpty]: Start isEmpty. Operand 173 states and 175 transitions. [2021-11-20 23:21:28,321 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 173 [2021-11-20 23:21:28,321 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:21:28,321 INFO L514 BasicCegarLoop]: trace histogram [28, 28, 27, 27, 27, 27, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:21:28,344 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Forceful destruction successful, exit code 0 [2021-11-20 23:21:28,530 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 33 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable34 [2021-11-20 23:21:28,531 INFO L402 AbstractCegarLoop]: === Iteration 36 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:21:28,531 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:21:28,531 INFO L85 PathProgramCache]: Analyzing trace with hash -1621508872, now seen corresponding path program 33 times [2021-11-20 23:21:28,531 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:21:28,531 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [724163612] [2021-11-20 23:21:28,531 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:21:28,531 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:21:28,582 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:21:29,592 INFO L134 CoverageAnalysis]: Checked inductivity of 2214 backedges. 1380 proven. 834 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:21:29,592 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:21:29,592 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [724163612] [2021-11-20 23:21:29,592 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [724163612] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:21:29,593 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1078175377] [2021-11-20 23:21:29,593 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-20 23:21:29,593 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:21:29,593 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:21:29,593 INFO L229 MonitoredProcess]: Starting monitored process 34 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:21:29,594 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Waiting until timeout for monitored process [2021-11-20 23:21:29,699 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-20 23:21:29,699 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:21:29,702 INFO L263 TraceCheckSpWp]: Trace formula consists of 641 conjuncts, 58 conjunts are in the unsatisfiable core [2021-11-20 23:21:29,705 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:21:30,895 INFO L134 CoverageAnalysis]: Checked inductivity of 2214 backedges. 756 proven. 1458 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:21:30,895 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:21:31,280 INFO L134 CoverageAnalysis]: Checked inductivity of 2214 backedges. 756 proven. 1458 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:21:31,280 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1078175377] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:21:31,280 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2016466999] [2021-11-20 23:21:31,281 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-20 23:21:31,281 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:21:31,282 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:21:31,282 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:21:31,282 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:21:32,659 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:21:33,256 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:21:33,256 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:21:33,256 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [58, 30, 30] total 87 [2021-11-20 23:21:33,257 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [853162775] [2021-11-20 23:21:33,257 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:21:33,257 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 87 states [2021-11-20 23:21:33,257 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:21:33,258 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 87 interpolants. [2021-11-20 23:21:33,258 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1367, Invalid=7753, Unknown=0, NotChecked=0, Total=9120 [2021-11-20 23:21:33,259 INFO L87 Difference]: Start difference. First operand 173 states and 175 transitions. Second operand has 87 states, 87 states have (on average 3.942528735632184) internal successors, (343), 87 states have internal predecessors, (343), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:21:36,004 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:21:36,004 INFO L93 Difference]: Finished difference Result 381 states and 413 transitions. [2021-11-20 23:21:36,004 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 117 states. [2021-11-20 23:21:36,005 INFO L78 Accepts]: Start accepts. Automaton has has 87 states, 87 states have (on average 3.942528735632184) internal successors, (343), 87 states have internal predecessors, (343), 0 states have call successors, (0), 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 172 [2021-11-20 23:21:36,005 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:21:36,006 INFO L225 Difference]: With dead ends: 381 [2021-11-20 23:21:36,006 INFO L226 Difference]: Without dead ends: 266 [2021-11-20 23:21:36,009 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 712 GetRequests, 505 SyntacticMatches, 1 SemanticMatches, 206 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 14638 ImplicationChecksByTransitivity, 4.1s TimeCoverageRelationStatistics Valid=6522, Invalid=36534, Unknown=0, NotChecked=0, Total=43056 [2021-11-20 23:21:36,009 INFO L933 BasicCegarLoop]: 31 mSDtfsCounter, 552 mSDsluCounter, 366 mSDsCounter, 0 mSdLazyCounter, 1730 mSolverCounterSat, 621 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 552 SdHoareTripleChecker+Valid, 396 SdHoareTripleChecker+Invalid, 2351 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 621 IncrementalHoareTripleChecker+Valid, 1730 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2021-11-20 23:21:36,010 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [552 Valid, 396 Invalid, 2351 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [621 Valid, 1730 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2021-11-20 23:21:36,010 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 266 states. [2021-11-20 23:21:36,026 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 266 to 179. [2021-11-20 23:21:36,026 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 179 states, 178 states have (on average 1.0168539325842696) internal successors, (181), 178 states have internal predecessors, (181), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:21:36,027 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 179 states to 179 states and 181 transitions. [2021-11-20 23:21:36,027 INFO L78 Accepts]: Start accepts. Automaton has 179 states and 181 transitions. Word has length 172 [2021-11-20 23:21:36,028 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:21:36,028 INFO L470 AbstractCegarLoop]: Abstraction has 179 states and 181 transitions. [2021-11-20 23:21:36,028 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 87 states, 87 states have (on average 3.942528735632184) internal successors, (343), 87 states have internal predecessors, (343), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:21:36,028 INFO L276 IsEmpty]: Start isEmpty. Operand 179 states and 181 transitions. [2021-11-20 23:21:36,029 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 179 [2021-11-20 23:21:36,029 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:21:36,029 INFO L514 BasicCegarLoop]: trace histogram [29, 29, 28, 28, 28, 28, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:21:36,074 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Forceful destruction successful, exit code 0 [2021-11-20 23:21:36,252 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 34 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable35 [2021-11-20 23:21:36,252 INFO L402 AbstractCegarLoop]: === Iteration 37 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:21:36,252 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:21:36,252 INFO L85 PathProgramCache]: Analyzing trace with hash 1842551312, now seen corresponding path program 34 times [2021-11-20 23:21:36,253 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:21:36,253 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1687707659] [2021-11-20 23:21:36,253 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:21:36,253 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:21:36,310 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:21:37,397 INFO L134 CoverageAnalysis]: Checked inductivity of 2380 backedges. 1487 proven. 893 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:21:37,397 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:21:37,397 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1687707659] [2021-11-20 23:21:37,397 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1687707659] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:21:37,397 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1930342252] [2021-11-20 23:21:37,397 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-20 23:21:37,397 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:21:37,397 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:21:37,398 INFO L229 MonitoredProcess]: Starting monitored process 35 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:21:37,399 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Waiting until timeout for monitored process [2021-11-20 23:21:37,489 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:21:37,492 INFO L263 TraceCheckSpWp]: Trace formula consists of 663 conjuncts, 60 conjunts are in the unsatisfiable core [2021-11-20 23:21:37,495 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:21:39,298 INFO L134 CoverageAnalysis]: Checked inductivity of 2380 backedges. 1568 proven. 812 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:21:39,299 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:21:39,677 INFO L134 CoverageAnalysis]: Checked inductivity of 2380 backedges. 1568 proven. 812 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:21:39,678 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1930342252] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:21:39,678 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1556407401] [2021-11-20 23:21:39,679 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-20 23:21:39,679 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:21:39,679 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:21:39,679 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:21:39,680 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:21:40,776 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:21:41,331 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:21:41,331 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:21:41,331 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [60, 60, 60] total 91 [2021-11-20 23:21:41,331 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [462496608] [2021-11-20 23:21:41,331 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:21:41,332 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 91 states [2021-11-20 23:21:41,332 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:21:41,333 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 91 interpolants. [2021-11-20 23:21:41,333 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1949, Invalid=7951, Unknown=0, NotChecked=0, Total=9900 [2021-11-20 23:21:41,333 INFO L87 Difference]: Start difference. First operand 179 states and 181 transitions. Second operand has 91 states, 91 states have (on average 3.2747252747252746) internal successors, (298), 91 states have internal predecessors, (298), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:21:42,282 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:21:42,282 INFO L93 Difference]: Finished difference Result 387 states and 419 transitions. [2021-11-20 23:21:42,282 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 60 states. [2021-11-20 23:21:42,282 INFO L78 Accepts]: Start accepts. Automaton has has 91 states, 91 states have (on average 3.2747252747252746) internal successors, (298), 91 states have internal predecessors, (298), 0 states have call successors, (0), 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 178 [2021-11-20 23:21:42,283 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:21:42,284 INFO L225 Difference]: With dead ends: 387 [2021-11-20 23:21:42,284 INFO L226 Difference]: Without dead ends: 268 [2021-11-20 23:21:42,285 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 621 GetRequests, 494 SyntacticMatches, 0 SemanticMatches, 127 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4182 ImplicationChecksByTransitivity, 3.1s TimeCoverageRelationStatistics Valid=3691, Invalid=12821, Unknown=0, NotChecked=0, Total=16512 [2021-11-20 23:21:42,285 INFO L933 BasicCegarLoop]: 60 mSDtfsCounter, 327 mSDsluCounter, 631 mSDsCounter, 0 mSdLazyCounter, 724 mSolverCounterSat, 273 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 327 SdHoareTripleChecker+Valid, 691 SdHoareTripleChecker+Invalid, 997 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 273 IncrementalHoareTripleChecker+Valid, 724 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-20 23:21:42,285 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [327 Valid, 691 Invalid, 997 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [273 Valid, 724 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-20 23:21:42,286 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 268 states. [2021-11-20 23:21:42,300 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 268 to 181. [2021-11-20 23:21:42,300 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 181 states, 180 states have (on average 1.0166666666666666) internal successors, (183), 180 states have internal predecessors, (183), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:21:42,301 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 181 states to 181 states and 183 transitions. [2021-11-20 23:21:42,301 INFO L78 Accepts]: Start accepts. Automaton has 181 states and 183 transitions. Word has length 178 [2021-11-20 23:21:42,301 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:21:42,301 INFO L470 AbstractCegarLoop]: Abstraction has 181 states and 183 transitions. [2021-11-20 23:21:42,301 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 91 states, 91 states have (on average 3.2747252747252746) internal successors, (298), 91 states have internal predecessors, (298), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:21:42,301 INFO L276 IsEmpty]: Start isEmpty. Operand 181 states and 183 transitions. [2021-11-20 23:21:42,302 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 181 [2021-11-20 23:21:42,302 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:21:42,302 INFO L514 BasicCegarLoop]: trace histogram [30, 29, 29, 28, 28, 28, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:21:42,323 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Forceful destruction successful, exit code 0 [2021-11-20 23:21:42,506 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 35 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable36 [2021-11-20 23:21:42,507 INFO L402 AbstractCegarLoop]: === Iteration 38 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:21:42,507 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:21:42,507 INFO L85 PathProgramCache]: Analyzing trace with hash -1196540875, now seen corresponding path program 35 times [2021-11-20 23:21:42,507 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:21:42,507 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1218711252] [2021-11-20 23:21:42,508 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:21:42,508 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:21:42,565 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:21:43,054 INFO L134 CoverageAnalysis]: Checked inductivity of 2438 backedges. 812 proven. 1626 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:21:43,055 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:21:43,055 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1218711252] [2021-11-20 23:21:43,055 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1218711252] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:21:43,055 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [968368498] [2021-11-20 23:21:43,055 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-20 23:21:43,055 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:21:43,055 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:21:43,056 INFO L229 MonitoredProcess]: Starting monitored process 36 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:21:43,057 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (36)] Waiting until timeout for monitored process [2021-11-20 23:21:43,196 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 30 check-sat command(s) [2021-11-20 23:21:43,196 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:21:43,199 INFO L263 TraceCheckSpWp]: Trace formula consists of 673 conjuncts, 61 conjunts are in the unsatisfiable core [2021-11-20 23:21:43,202 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:21:43,546 INFO L134 CoverageAnalysis]: Checked inductivity of 2438 backedges. 870 proven. 1568 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:21:43,546 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:21:43,888 INFO L134 CoverageAnalysis]: Checked inductivity of 2438 backedges. 870 proven. 1568 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:21:43,888 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [968368498] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:21:43,888 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [431395647] [2021-11-20 23:21:43,889 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-20 23:21:43,889 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:21:43,889 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:21:43,890 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:21:43,890 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:21:45,293 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:21:45,645 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:21:45,645 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:21:45,646 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [32, 32, 32] total 35 [2021-11-20 23:21:45,646 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2006609986] [2021-11-20 23:21:45,646 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:21:45,646 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 36 states [2021-11-20 23:21:45,646 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:21:45,647 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2021-11-20 23:21:45,647 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=583, Invalid=1397, Unknown=0, NotChecked=0, Total=1980 [2021-11-20 23:21:45,647 INFO L87 Difference]: Start difference. First operand 181 states and 183 transitions. Second operand has 36 states, 36 states have (on average 5.583333333333333) internal successors, (201), 35 states have internal predecessors, (201), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:21:46,191 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:21:46,191 INFO L93 Difference]: Finished difference Result 198 states and 201 transitions. [2021-11-20 23:21:46,191 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 66 states. [2021-11-20 23:21:46,191 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 36 states have (on average 5.583333333333333) internal successors, (201), 35 states have internal predecessors, (201), 0 states have call successors, (0), 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 180 [2021-11-20 23:21:46,192 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:21:46,192 INFO L225 Difference]: With dead ends: 198 [2021-11-20 23:21:46,193 INFO L226 Difference]: Without dead ends: 196 [2021-11-20 23:21:46,193 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 630 GetRequests, 554 SyntacticMatches, 1 SemanticMatches, 75 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1659 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=1708, Invalid=4144, Unknown=0, NotChecked=0, Total=5852 [2021-11-20 23:21:46,194 INFO L933 BasicCegarLoop]: 38 mSDtfsCounter, 166 mSDsluCounter, 267 mSDsCounter, 0 mSdLazyCounter, 327 mSolverCounterSat, 125 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 166 SdHoareTripleChecker+Valid, 296 SdHoareTripleChecker+Invalid, 452 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 125 IncrementalHoareTripleChecker+Valid, 327 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-20 23:21:46,194 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [166 Valid, 296 Invalid, 452 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [125 Valid, 327 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-20 23:21:46,195 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 196 states. [2021-11-20 23:21:46,210 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 196 to 189. [2021-11-20 23:21:46,210 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 189 states, 188 states have (on average 1.0159574468085106) internal successors, (191), 188 states have internal predecessors, (191), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:21:46,211 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 189 states to 189 states and 191 transitions. [2021-11-20 23:21:46,211 INFO L78 Accepts]: Start accepts. Automaton has 189 states and 191 transitions. Word has length 180 [2021-11-20 23:21:46,211 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:21:46,211 INFO L470 AbstractCegarLoop]: Abstraction has 189 states and 191 transitions. [2021-11-20 23:21:46,211 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 36 states, 36 states have (on average 5.583333333333333) internal successors, (201), 35 states have internal predecessors, (201), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:21:46,211 INFO L276 IsEmpty]: Start isEmpty. Operand 189 states and 191 transitions. [2021-11-20 23:21:46,212 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 189 [2021-11-20 23:21:46,212 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:21:46,212 INFO L514 BasicCegarLoop]: trace histogram [31, 30, 30, 30, 30, 29, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:21:46,233 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (36)] Forceful destruction successful, exit code 0 [2021-11-20 23:21:46,412 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 36 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable37 [2021-11-20 23:21:46,413 INFO L402 AbstractCegarLoop]: === Iteration 39 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:21:46,413 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:21:46,413 INFO L85 PathProgramCache]: Analyzing trace with hash -1867937509, now seen corresponding path program 36 times [2021-11-20 23:21:46,413 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:21:46,413 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [800097116] [2021-11-20 23:21:46,413 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:21:46,413 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:21:46,472 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:21:47,632 INFO L134 CoverageAnalysis]: Checked inductivity of 2670 backedges. 1713 proven. 957 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:21:47,633 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:21:47,633 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [800097116] [2021-11-20 23:21:47,633 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [800097116] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:21:47,633 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1063868638] [2021-11-20 23:21:47,633 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-20 23:21:47,634 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:21:47,634 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:21:47,643 INFO L229 MonitoredProcess]: Starting monitored process 37 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:21:47,650 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (37)] Waiting until timeout for monitored process [2021-11-20 23:21:47,771 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-20 23:21:47,771 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:21:47,775 INFO L263 TraceCheckSpWp]: Trace formula consists of 697 conjuncts, 63 conjunts are in the unsatisfiable core [2021-11-20 23:21:47,779 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:21:49,573 INFO L134 CoverageAnalysis]: Checked inductivity of 2670 backedges. 1800 proven. 870 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:21:49,574 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:21:49,987 INFO L134 CoverageAnalysis]: Checked inductivity of 2670 backedges. 1800 proven. 870 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:21:49,987 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1063868638] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:21:49,987 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [149493406] [2021-11-20 23:21:49,988 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-20 23:21:49,988 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:21:49,988 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:21:49,988 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:21:49,989 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:21:51,254 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:21:51,860 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:21:51,860 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:21:51,860 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [63, 63, 63] total 98 [2021-11-20 23:21:51,860 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [926827421] [2021-11-20 23:21:51,860 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:21:51,861 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 98 states [2021-11-20 23:21:51,861 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:21:51,861 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 98 interpolants. [2021-11-20 23:21:51,862 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2270, Invalid=9072, Unknown=0, NotChecked=0, Total=11342 [2021-11-20 23:21:51,862 INFO L87 Difference]: Start difference. First operand 189 states and 191 transitions. Second operand has 98 states, 98 states have (on average 3.316326530612245) internal successors, (325), 98 states have internal predecessors, (325), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:21:53,668 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:21:53,669 INFO L93 Difference]: Finished difference Result 532 states and 567 transitions. [2021-11-20 23:21:53,669 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 94 states. [2021-11-20 23:21:53,669 INFO L78 Accepts]: Start accepts. Automaton has has 98 states, 98 states have (on average 3.316326530612245) internal successors, (325), 98 states have internal predecessors, (325), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 188 [2021-11-20 23:21:53,671 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:21:53,672 INFO L225 Difference]: With dead ends: 532 [2021-11-20 23:21:53,672 INFO L226 Difference]: Without dead ends: 286 [2021-11-20 23:21:53,675 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 686 GetRequests, 520 SyntacticMatches, 0 SemanticMatches, 166 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7374 ImplicationChecksByTransitivity, 3.9s TimeCoverageRelationStatistics Valid=6206, Invalid=21850, Unknown=0, NotChecked=0, Total=28056 [2021-11-20 23:21:53,676 INFO L933 BasicCegarLoop]: 62 mSDtfsCounter, 395 mSDsluCounter, 815 mSDsCounter, 0 mSdLazyCounter, 924 mSolverCounterSat, 330 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 395 SdHoareTripleChecker+Valid, 877 SdHoareTripleChecker+Invalid, 1254 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 330 IncrementalHoareTripleChecker+Valid, 924 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-20 23:21:53,676 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [395 Valid, 877 Invalid, 1254 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [330 Valid, 924 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-20 23:21:53,677 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 286 states. [2021-11-20 23:21:53,696 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 286 to 193. [2021-11-20 23:21:53,696 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 193 states, 192 states have (on average 1.015625) internal successors, (195), 192 states have internal predecessors, (195), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:21:53,697 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 193 states to 193 states and 195 transitions. [2021-11-20 23:21:53,697 INFO L78 Accepts]: Start accepts. Automaton has 193 states and 195 transitions. Word has length 188 [2021-11-20 23:21:53,697 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:21:53,697 INFO L470 AbstractCegarLoop]: Abstraction has 193 states and 195 transitions. [2021-11-20 23:21:53,698 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 98 states, 98 states have (on average 3.316326530612245) internal successors, (325), 98 states have internal predecessors, (325), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:21:53,698 INFO L276 IsEmpty]: Start isEmpty. Operand 193 states and 195 transitions. [2021-11-20 23:21:53,699 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 193 [2021-11-20 23:21:53,699 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:21:53,699 INFO L514 BasicCegarLoop]: trace histogram [32, 31, 31, 30, 30, 30, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:21:53,736 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (37)] Forceful destruction successful, exit code 0 [2021-11-20 23:21:53,921 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 37 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable38 [2021-11-20 23:21:53,921 INFO L402 AbstractCegarLoop]: === Iteration 40 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:21:53,921 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:21:53,922 INFO L85 PathProgramCache]: Analyzing trace with hash -457698395, now seen corresponding path program 37 times [2021-11-20 23:21:53,922 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:21:53,922 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [640801940] [2021-11-20 23:21:53,922 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:21:53,922 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:21:53,981 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:21:54,532 INFO L134 CoverageAnalysis]: Checked inductivity of 2792 backedges. 930 proven. 1862 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:21:54,532 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:21:54,532 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [640801940] [2021-11-20 23:21:54,532 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [640801940] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:21:54,533 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [500914173] [2021-11-20 23:21:54,533 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-20 23:21:54,533 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:21:54,533 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:21:54,533 INFO L229 MonitoredProcess]: Starting monitored process 38 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:21:54,534 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (38)] Waiting until timeout for monitored process [2021-11-20 23:21:54,630 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:21:54,634 INFO L263 TraceCheckSpWp]: Trace formula consists of 717 conjuncts, 65 conjunts are in the unsatisfiable core [2021-11-20 23:21:54,636 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:21:54,989 INFO L134 CoverageAnalysis]: Checked inductivity of 2792 backedges. 992 proven. 1800 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:21:54,989 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:21:55,372 INFO L134 CoverageAnalysis]: Checked inductivity of 2792 backedges. 992 proven. 1800 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:21:55,373 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [500914173] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:21:55,373 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1098999586] [2021-11-20 23:21:55,374 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-20 23:21:55,374 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:21:55,374 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:21:55,374 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:21:55,375 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:21:56,695 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:21:57,078 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:21:57,078 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:21:57,079 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [34, 34, 34] total 37 [2021-11-20 23:21:57,079 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [280972581] [2021-11-20 23:21:57,079 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:21:57,079 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 38 states [2021-11-20 23:21:57,079 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:21:57,080 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2021-11-20 23:21:57,080 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=650, Invalid=1512, Unknown=0, NotChecked=0, Total=2162 [2021-11-20 23:21:57,080 INFO L87 Difference]: Start difference. First operand 193 states and 195 transitions. Second operand has 38 states, 38 states have (on average 5.605263157894737) internal successors, (213), 37 states have internal predecessors, (213), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:21:57,656 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:21:57,656 INFO L93 Difference]: Finished difference Result 210 states and 213 transitions. [2021-11-20 23:21:57,656 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 70 states. [2021-11-20 23:21:57,656 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 38 states have (on average 5.605263157894737) internal successors, (213), 37 states have internal predecessors, (213), 0 states have call successors, (0), 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 192 [2021-11-20 23:21:57,656 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:21:57,657 INFO L225 Difference]: With dead ends: 210 [2021-11-20 23:21:57,657 INFO L226 Difference]: Without dead ends: 208 [2021-11-20 23:21:57,658 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 672 GetRequests, 592 SyntacticMatches, 1 SemanticMatches, 79 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1831 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=1913, Invalid=4567, Unknown=0, NotChecked=0, Total=6480 [2021-11-20 23:21:57,658 INFO L933 BasicCegarLoop]: 40 mSDtfsCounter, 212 mSDsluCounter, 209 mSDsCounter, 0 mSdLazyCounter, 291 mSolverCounterSat, 134 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 212 SdHoareTripleChecker+Valid, 244 SdHoareTripleChecker+Invalid, 425 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 134 IncrementalHoareTripleChecker+Valid, 291 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-20 23:21:57,658 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [212 Valid, 244 Invalid, 425 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [134 Valid, 291 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-20 23:21:57,659 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 208 states. [2021-11-20 23:21:57,672 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 208 to 201. [2021-11-20 23:21:57,672 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 201 states, 200 states have (on average 1.015) internal successors, (203), 200 states have internal predecessors, (203), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:21:57,672 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 201 states to 201 states and 203 transitions. [2021-11-20 23:21:57,673 INFO L78 Accepts]: Start accepts. Automaton has 201 states and 203 transitions. Word has length 192 [2021-11-20 23:21:57,673 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:21:57,673 INFO L470 AbstractCegarLoop]: Abstraction has 201 states and 203 transitions. [2021-11-20 23:21:57,673 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 38 states, 38 states have (on average 5.605263157894737) internal successors, (213), 37 states have internal predecessors, (213), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:21:57,673 INFO L276 IsEmpty]: Start isEmpty. Operand 201 states and 203 transitions. [2021-11-20 23:21:57,674 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 201 [2021-11-20 23:21:57,674 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:21:57,674 INFO L514 BasicCegarLoop]: trace histogram [33, 32, 32, 32, 32, 31, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:21:57,695 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (38)] Forceful destruction successful, exit code 0 [2021-11-20 23:21:57,874 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 38 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable39 [2021-11-20 23:21:57,875 INFO L402 AbstractCegarLoop]: === Iteration 41 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:21:57,875 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:21:57,875 INFO L85 PathProgramCache]: Analyzing trace with hash -86183797, now seen corresponding path program 38 times [2021-11-20 23:21:57,875 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:21:57,876 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1077712708] [2021-11-20 23:21:57,876 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:21:57,876 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:21:57,942 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:21:59,214 INFO L134 CoverageAnalysis]: Checked inductivity of 3040 backedges. 1955 proven. 1085 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:21:59,214 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:21:59,214 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1077712708] [2021-11-20 23:21:59,214 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1077712708] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:21:59,214 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1304374112] [2021-11-20 23:21:59,214 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-20 23:21:59,214 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:21:59,214 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:21:59,215 INFO L229 MonitoredProcess]: Starting monitored process 39 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:21:59,216 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (39)] Waiting until timeout for monitored process [2021-11-20 23:21:59,369 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 33 check-sat command(s) [2021-11-20 23:21:59,369 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:21:59,373 INFO L263 TraceCheckSpWp]: Trace formula consists of 741 conjuncts, 67 conjunts are in the unsatisfiable core [2021-11-20 23:21:59,376 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:22:01,490 INFO L134 CoverageAnalysis]: Checked inductivity of 3040 backedges. 2048 proven. 992 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:22:01,490 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:22:01,965 INFO L134 CoverageAnalysis]: Checked inductivity of 3040 backedges. 2048 proven. 992 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:22:01,965 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1304374112] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:22:01,966 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [538338011] [2021-11-20 23:22:01,967 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-20 23:22:01,967 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:22:01,967 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:22:01,967 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:22:01,967 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:22:03,308 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:22:03,948 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:22:03,948 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:22:03,949 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [67, 67, 67] total 104 [2021-11-20 23:22:03,949 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2080583897] [2021-11-20 23:22:03,949 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:22:03,949 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 104 states [2021-11-20 23:22:03,949 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:22:03,950 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 104 interpolants. [2021-11-20 23:22:03,951 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2546, Invalid=10110, Unknown=0, NotChecked=0, Total=12656 [2021-11-20 23:22:03,951 INFO L87 Difference]: Start difference. First operand 201 states and 203 transitions. Second operand has 104 states, 104 states have (on average 3.3173076923076925) internal successors, (345), 104 states have internal predecessors, (345), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:22:05,856 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:22:05,857 INFO L93 Difference]: Finished difference Result 566 states and 603 transitions. [2021-11-20 23:22:05,857 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 100 states. [2021-11-20 23:22:05,857 INFO L78 Accepts]: Start accepts. Automaton has has 104 states, 104 states have (on average 3.3173076923076925) internal successors, (345), 104 states have internal predecessors, (345), 0 states have call successors, (0), 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 200 [2021-11-20 23:22:05,857 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:22:05,858 INFO L225 Difference]: With dead ends: 566 [2021-11-20 23:22:05,858 INFO L226 Difference]: Without dead ends: 304 [2021-11-20 23:22:05,860 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 730 GetRequests, 554 SyntacticMatches, 0 SemanticMatches, 176 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8246 ImplicationChecksByTransitivity, 4.4s TimeCoverageRelationStatistics Valid=7000, Invalid=24506, Unknown=0, NotChecked=0, Total=31506 [2021-11-20 23:22:05,860 INFO L933 BasicCegarLoop]: 66 mSDtfsCounter, 485 mSDsluCounter, 775 mSDsCounter, 0 mSdLazyCounter, 891 mSolverCounterSat, 385 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 485 SdHoareTripleChecker+Valid, 841 SdHoareTripleChecker+Invalid, 1276 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 385 IncrementalHoareTripleChecker+Valid, 891 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-20 23:22:05,860 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [485 Valid, 841 Invalid, 1276 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [385 Valid, 891 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-20 23:22:05,861 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 304 states. [2021-11-20 23:22:05,874 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 304 to 205. [2021-11-20 23:22:05,874 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 205 states, 204 states have (on average 1.0147058823529411) internal successors, (207), 204 states have internal predecessors, (207), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:22:05,875 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 205 states to 205 states and 207 transitions. [2021-11-20 23:22:05,875 INFO L78 Accepts]: Start accepts. Automaton has 205 states and 207 transitions. Word has length 200 [2021-11-20 23:22:05,875 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:22:05,876 INFO L470 AbstractCegarLoop]: Abstraction has 205 states and 207 transitions. [2021-11-20 23:22:05,876 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 104 states, 104 states have (on average 3.3173076923076925) internal successors, (345), 104 states have internal predecessors, (345), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:22:05,876 INFO L276 IsEmpty]: Start isEmpty. Operand 205 states and 207 transitions. [2021-11-20 23:22:05,877 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 205 [2021-11-20 23:22:05,877 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:22:05,877 INFO L514 BasicCegarLoop]: trace histogram [34, 33, 33, 32, 32, 32, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:22:05,912 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (39)] Forceful destruction successful, exit code 0 [2021-11-20 23:22:06,098 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable40,39 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:22:06,099 INFO L402 AbstractCegarLoop]: === Iteration 42 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:22:06,099 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:22:06,099 INFO L85 PathProgramCache]: Analyzing trace with hash -569508843, now seen corresponding path program 39 times [2021-11-20 23:22:06,099 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:22:06,099 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [952636213] [2021-11-20 23:22:06,099 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:22:06,099 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:22:06,167 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:22:06,704 INFO L134 CoverageAnalysis]: Checked inductivity of 3170 backedges. 1056 proven. 2114 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:22:06,704 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:22:06,704 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [952636213] [2021-11-20 23:22:06,704 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [952636213] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:22:06,704 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1235363217] [2021-11-20 23:22:06,704 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-20 23:22:06,704 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:22:06,704 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:22:06,705 INFO L229 MonitoredProcess]: Starting monitored process 40 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:22:06,707 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (40)] Waiting until timeout for monitored process [2021-11-20 23:22:06,811 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-20 23:22:06,812 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:22:06,815 INFO L263 TraceCheckSpWp]: Trace formula consists of 761 conjuncts, 69 conjunts are in the unsatisfiable core [2021-11-20 23:22:06,818 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:22:07,202 INFO L134 CoverageAnalysis]: Checked inductivity of 3170 backedges. 1122 proven. 2048 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:22:07,202 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:22:07,600 INFO L134 CoverageAnalysis]: Checked inductivity of 3170 backedges. 1122 proven. 2048 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:22:07,601 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1235363217] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:22:07,601 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1445043408] [2021-11-20 23:22:07,602 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-20 23:22:07,602 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:22:07,602 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:22:07,602 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:22:07,602 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:22:08,637 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:22:08,993 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:22:08,993 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:22:08,993 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [36, 36, 36] total 39 [2021-11-20 23:22:08,993 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1091756738] [2021-11-20 23:22:08,993 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:22:08,994 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 40 states [2021-11-20 23:22:08,994 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:22:08,994 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 40 interpolants. [2021-11-20 23:22:08,994 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=721, Invalid=1631, Unknown=0, NotChecked=0, Total=2352 [2021-11-20 23:22:08,995 INFO L87 Difference]: Start difference. First operand 205 states and 207 transitions. Second operand has 40 states, 40 states have (on average 5.625) internal successors, (225), 39 states have internal predecessors, (225), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:22:09,644 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:22:09,645 INFO L93 Difference]: Finished difference Result 222 states and 225 transitions. [2021-11-20 23:22:09,645 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 74 states. [2021-11-20 23:22:09,645 INFO L78 Accepts]: Start accepts. Automaton has has 40 states, 40 states have (on average 5.625) internal successors, (225), 39 states have internal predecessors, (225), 0 states have call successors, (0), 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 204 [2021-11-20 23:22:09,645 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:22:09,646 INFO L225 Difference]: With dead ends: 222 [2021-11-20 23:22:09,646 INFO L226 Difference]: Without dead ends: 220 [2021-11-20 23:22:09,646 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 714 GetRequests, 630 SyntacticMatches, 1 SemanticMatches, 83 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2011 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=2130, Invalid=5010, Unknown=0, NotChecked=0, Total=7140 [2021-11-20 23:22:09,647 INFO L933 BasicCegarLoop]: 42 mSDtfsCounter, 186 mSDsluCounter, 285 mSDsCounter, 0 mSdLazyCounter, 360 mSolverCounterSat, 141 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 186 SdHoareTripleChecker+Valid, 319 SdHoareTripleChecker+Invalid, 501 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 141 IncrementalHoareTripleChecker+Valid, 360 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-20 23:22:09,647 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [186 Valid, 319 Invalid, 501 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [141 Valid, 360 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-20 23:22:09,647 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 220 states. [2021-11-20 23:22:09,668 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 220 to 213. [2021-11-20 23:22:09,669 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 213 states, 212 states have (on average 1.0141509433962264) internal successors, (215), 212 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 23:22:09,669 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 213 states to 213 states and 215 transitions. [2021-11-20 23:22:09,669 INFO L78 Accepts]: Start accepts. Automaton has 213 states and 215 transitions. Word has length 204 [2021-11-20 23:22:09,670 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:22:09,670 INFO L470 AbstractCegarLoop]: Abstraction has 213 states and 215 transitions. [2021-11-20 23:22:09,670 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 40 states, 40 states have (on average 5.625) internal successors, (225), 39 states have internal predecessors, (225), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:22:09,670 INFO L276 IsEmpty]: Start isEmpty. Operand 213 states and 215 transitions. [2021-11-20 23:22:09,671 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 213 [2021-11-20 23:22:09,671 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:22:09,672 INFO L514 BasicCegarLoop]: trace histogram [35, 34, 34, 34, 34, 33, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:22:09,709 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (40)] Forceful destruction successful, exit code 0 [2021-11-20 23:22:09,893 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 40 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable41 [2021-11-20 23:22:09,894 INFO L402 AbstractCegarLoop]: === Iteration 43 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:22:09,894 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:22:09,894 INFO L85 PathProgramCache]: Analyzing trace with hash -1313117957, now seen corresponding path program 40 times [2021-11-20 23:22:09,894 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:22:09,894 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [932326851] [2021-11-20 23:22:09,894 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:22:09,894 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:22:09,959 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:22:11,571 INFO L134 CoverageAnalysis]: Checked inductivity of 3434 backedges. 2213 proven. 1221 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:22:11,571 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:22:11,571 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [932326851] [2021-11-20 23:22:11,571 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [932326851] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:22:11,571 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [983896883] [2021-11-20 23:22:11,572 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-20 23:22:11,572 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:22:11,572 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:22:11,572 INFO L229 MonitoredProcess]: Starting monitored process 41 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:22:11,574 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (41)] Waiting until timeout for monitored process [2021-11-20 23:22:11,676 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:22:11,679 INFO L263 TraceCheckSpWp]: Trace formula consists of 785 conjuncts, 70 conjunts are in the unsatisfiable core [2021-11-20 23:22:11,681 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:22:13,877 INFO L134 CoverageAnalysis]: Checked inductivity of 3434 backedges. 2310 proven. 1122 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-20 23:22:13,877 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:22:14,311 INFO L134 CoverageAnalysis]: Checked inductivity of 3434 backedges. 2310 proven. 1122 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-20 23:22:14,311 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [983896883] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:22:14,311 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1651994661] [2021-11-20 23:22:14,312 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-20 23:22:14,312 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:22:14,312 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:22:14,312 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:22:14,312 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:22:15,668 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:22:16,435 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:22:16,435 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:22:16,435 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [71, 70, 70] total 107 [2021-11-20 23:22:16,435 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1421344936] [2021-11-20 23:22:16,435 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:22:16,436 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 107 states [2021-11-20 23:22:16,436 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:22:16,437 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 107 interpolants. [2021-11-20 23:22:16,437 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2655, Invalid=10685, Unknown=0, NotChecked=0, Total=13340 [2021-11-20 23:22:16,437 INFO L87 Difference]: Start difference. First operand 213 states and 215 transitions. Second operand has 107 states, 107 states have (on average 3.3271028037383177) internal successors, (356), 107 states have internal predecessors, (356), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:22:17,676 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:22:17,676 INFO L93 Difference]: Finished difference Result 458 states and 495 transitions. [2021-11-20 23:22:17,676 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 70 states. [2021-11-20 23:22:17,676 INFO L78 Accepts]: Start accepts. Automaton has has 107 states, 107 states have (on average 3.3271028037383177) internal successors, (356), 107 states have internal predecessors, (356), 0 states have call successors, (0), 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 212 [2021-11-20 23:22:17,677 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:22:17,678 INFO L225 Difference]: With dead ends: 458 [2021-11-20 23:22:17,678 INFO L226 Difference]: Without dead ends: 317 [2021-11-20 23:22:17,679 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 739 GetRequests, 591 SyntacticMatches, 0 SemanticMatches, 148 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5608 ImplicationChecksByTransitivity, 4.4s TimeCoverageRelationStatistics Valid=5037, Invalid=17313, Unknown=0, NotChecked=0, Total=22350 [2021-11-20 23:22:17,680 INFO L933 BasicCegarLoop]: 70 mSDtfsCounter, 299 mSDsluCounter, 751 mSDsCounter, 0 mSdLazyCounter, 869 mSolverCounterSat, 240 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 299 SdHoareTripleChecker+Valid, 821 SdHoareTripleChecker+Invalid, 1109 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 240 IncrementalHoareTripleChecker+Valid, 869 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-20 23:22:17,680 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [299 Valid, 821 Invalid, 1109 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [240 Valid, 869 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-20 23:22:17,681 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 317 states. [2021-11-20 23:22:17,702 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 317 to 215. [2021-11-20 23:22:17,703 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 215 states, 214 states have (on average 1.014018691588785) internal successors, (217), 214 states have internal predecessors, (217), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:22:17,703 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 215 states to 215 states and 217 transitions. [2021-11-20 23:22:17,704 INFO L78 Accepts]: Start accepts. Automaton has 215 states and 217 transitions. Word has length 212 [2021-11-20 23:22:17,704 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:22:17,704 INFO L470 AbstractCegarLoop]: Abstraction has 215 states and 217 transitions. [2021-11-20 23:22:17,704 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 107 states, 107 states have (on average 3.3271028037383177) internal successors, (356), 107 states have internal predecessors, (356), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:22:17,704 INFO L276 IsEmpty]: Start isEmpty. Operand 215 states and 217 transitions. [2021-11-20 23:22:17,705 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 215 [2021-11-20 23:22:17,706 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:22:17,706 INFO L514 BasicCegarLoop]: trace histogram [35, 35, 34, 34, 34, 34, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:22:17,727 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (41)] Forceful destruction successful, exit code 0 [2021-11-20 23:22:17,910 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable42,41 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:22:17,911 INFO L402 AbstractCegarLoop]: === Iteration 44 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:22:17,911 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:22:17,911 INFO L85 PathProgramCache]: Analyzing trace with hash 748798432, now seen corresponding path program 41 times [2021-11-20 23:22:17,911 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:22:17,911 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [50544591] [2021-11-20 23:22:17,911 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:22:17,912 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:22:17,969 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:22:19,494 INFO L134 CoverageAnalysis]: Checked inductivity of 3502 backedges. 2213 proven. 1289 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:22:19,494 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:22:19,495 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [50544591] [2021-11-20 23:22:19,495 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [50544591] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:22:19,495 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [597834579] [2021-11-20 23:22:19,495 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-20 23:22:19,495 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:22:19,495 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:22:19,496 INFO L229 MonitoredProcess]: Starting monitored process 42 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:22:19,497 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (42)] Waiting until timeout for monitored process [2021-11-20 23:22:19,664 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 35 check-sat command(s) [2021-11-20 23:22:19,664 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:22:19,668 INFO L263 TraceCheckSpWp]: Trace formula consists of 795 conjuncts, 72 conjunts are in the unsatisfiable core [2021-11-20 23:22:19,671 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:22:21,904 INFO L134 CoverageAnalysis]: Checked inductivity of 3502 backedges. 2312 proven. 1190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:22:21,904 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:22:22,300 INFO L134 CoverageAnalysis]: Checked inductivity of 3502 backedges. 2312 proven. 1190 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:22:22,300 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [597834579] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:22:22,300 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1966248074] [2021-11-20 23:22:22,301 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-20 23:22:22,301 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:22:22,301 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:22:22,302 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:22:22,302 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:22:23,571 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:22:24,206 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:22:24,207 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:22:24,207 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [72, 72, 72] total 109 [2021-11-20 23:22:24,207 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1561808793] [2021-11-20 23:22:24,207 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:22:24,207 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 109 states [2021-11-20 23:22:24,208 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:22:24,208 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 109 interpolants. [2021-11-20 23:22:24,209 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2765, Invalid=11041, Unknown=0, NotChecked=0, Total=13806 [2021-11-20 23:22:24,209 INFO L87 Difference]: Start difference. First operand 215 states and 217 transitions. Second operand has 109 states, 109 states have (on average 3.2844036697247705) internal successors, (358), 109 states have internal predecessors, (358), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:22:25,450 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:22:25,450 INFO L93 Difference]: Finished difference Result 465 states and 503 transitions. [2021-11-20 23:22:25,450 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 72 states. [2021-11-20 23:22:25,450 INFO L78 Accepts]: Start accepts. Automaton has has 109 states, 109 states have (on average 3.2844036697247705) internal successors, (358), 109 states have internal predecessors, (358), 0 states have call successors, (0), 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 214 [2021-11-20 23:22:25,450 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:22:25,451 INFO L225 Difference]: With dead ends: 465 [2021-11-20 23:22:25,451 INFO L226 Difference]: Without dead ends: 322 [2021-11-20 23:22:25,452 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 747 GetRequests, 596 SyntacticMatches, 0 SemanticMatches, 151 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5781 ImplicationChecksByTransitivity, 4.2s TimeCoverageRelationStatistics Valid=5287, Invalid=17969, Unknown=0, NotChecked=0, Total=23256 [2021-11-20 23:22:25,453 INFO L933 BasicCegarLoop]: 72 mSDtfsCounter, 384 mSDsluCounter, 598 mSDsCounter, 0 mSdLazyCounter, 701 mSolverCounterSat, 322 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 384 SdHoareTripleChecker+Valid, 670 SdHoareTripleChecker+Invalid, 1023 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 322 IncrementalHoareTripleChecker+Valid, 701 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-20 23:22:25,453 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [384 Valid, 670 Invalid, 1023 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [322 Valid, 701 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-20 23:22:25,454 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 322 states. [2021-11-20 23:22:25,471 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 322 to 217. [2021-11-20 23:22:25,471 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 217 states, 216 states have (on average 1.0138888888888888) internal successors, (219), 216 states have internal predecessors, (219), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:22:25,471 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 217 states to 217 states and 219 transitions. [2021-11-20 23:22:25,471 INFO L78 Accepts]: Start accepts. Automaton has 217 states and 219 transitions. Word has length 214 [2021-11-20 23:22:25,472 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:22:25,472 INFO L470 AbstractCegarLoop]: Abstraction has 217 states and 219 transitions. [2021-11-20 23:22:25,472 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 109 states, 109 states have (on average 3.2844036697247705) internal successors, (358), 109 states have internal predecessors, (358), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:22:25,472 INFO L276 IsEmpty]: Start isEmpty. Operand 217 states and 219 transitions. [2021-11-20 23:22:25,473 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 217 [2021-11-20 23:22:25,473 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:22:25,473 INFO L514 BasicCegarLoop]: trace histogram [36, 35, 35, 34, 34, 34, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:22:25,494 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (42)] Forceful destruction successful, exit code 0 [2021-11-20 23:22:25,673 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 42 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable43 [2021-11-20 23:22:25,673 INFO L402 AbstractCegarLoop]: === Iteration 45 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:22:25,674 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:22:25,674 INFO L85 PathProgramCache]: Analyzing trace with hash -2024442491, now seen corresponding path program 42 times [2021-11-20 23:22:25,674 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:22:25,674 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2039103820] [2021-11-20 23:22:25,674 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:22:25,674 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:22:25,747 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:22:26,346 INFO L134 CoverageAnalysis]: Checked inductivity of 3572 backedges. 1190 proven. 2382 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:22:26,346 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:22:26,346 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2039103820] [2021-11-20 23:22:26,346 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2039103820] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:22:26,346 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1292029381] [2021-11-20 23:22:26,346 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-20 23:22:26,347 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:22:26,347 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:22:26,347 INFO L229 MonitoredProcess]: Starting monitored process 43 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:22:26,348 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (43)] Waiting until timeout for monitored process [2021-11-20 23:22:26,453 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-20 23:22:26,453 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:22:26,457 INFO L263 TraceCheckSpWp]: Trace formula consists of 805 conjuncts, 73 conjunts are in the unsatisfiable core [2021-11-20 23:22:26,459 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:22:26,862 INFO L134 CoverageAnalysis]: Checked inductivity of 3572 backedges. 1260 proven. 2312 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:22:26,862 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:22:27,269 INFO L134 CoverageAnalysis]: Checked inductivity of 3572 backedges. 1260 proven. 2312 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:22:27,269 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1292029381] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:22:27,269 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [934620329] [2021-11-20 23:22:27,270 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-20 23:22:27,270 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:22:27,271 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:22:27,271 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:22:27,271 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:22:28,510 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:22:28,893 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:22:28,893 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:22:28,893 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38, 38, 38] total 41 [2021-11-20 23:22:28,893 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1444790330] [2021-11-20 23:22:28,894 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:22:28,894 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 42 states [2021-11-20 23:22:28,894 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:22:28,895 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2021-11-20 23:22:28,895 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=796, Invalid=1754, Unknown=0, NotChecked=0, Total=2550 [2021-11-20 23:22:28,895 INFO L87 Difference]: Start difference. First operand 217 states and 219 transitions. Second operand has 42 states, 42 states have (on average 5.642857142857143) internal successors, (237), 41 states have internal predecessors, (237), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:22:29,587 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:22:29,588 INFO L93 Difference]: Finished difference Result 234 states and 237 transitions. [2021-11-20 23:22:29,588 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 78 states. [2021-11-20 23:22:29,588 INFO L78 Accepts]: Start accepts. Automaton has has 42 states, 42 states have (on average 5.642857142857143) internal successors, (237), 41 states have internal predecessors, (237), 0 states have call successors, (0), 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 216 [2021-11-20 23:22:29,588 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:22:29,589 INFO L225 Difference]: With dead ends: 234 [2021-11-20 23:22:29,589 INFO L226 Difference]: Without dead ends: 232 [2021-11-20 23:22:29,590 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 756 GetRequests, 668 SyntacticMatches, 1 SemanticMatches, 87 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2199 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=2359, Invalid=5473, Unknown=0, NotChecked=0, Total=7832 [2021-11-20 23:22:29,590 INFO L933 BasicCegarLoop]: 44 mSDtfsCounter, 264 mSDsluCounter, 256 mSDsCounter, 0 mSdLazyCounter, 343 mSolverCounterSat, 185 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 264 SdHoareTripleChecker+Valid, 294 SdHoareTripleChecker+Invalid, 528 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 185 IncrementalHoareTripleChecker+Valid, 343 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-20 23:22:29,590 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [264 Valid, 294 Invalid, 528 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [185 Valid, 343 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-20 23:22:29,591 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 232 states. [2021-11-20 23:22:29,606 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 232 to 225. [2021-11-20 23:22:29,607 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 225 states, 224 states have (on average 1.0133928571428572) internal successors, (227), 224 states have internal predecessors, (227), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:22:29,607 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 225 states to 225 states and 227 transitions. [2021-11-20 23:22:29,607 INFO L78 Accepts]: Start accepts. Automaton has 225 states and 227 transitions. Word has length 216 [2021-11-20 23:22:29,608 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:22:29,608 INFO L470 AbstractCegarLoop]: Abstraction has 225 states and 227 transitions. [2021-11-20 23:22:29,608 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 42 states, 42 states have (on average 5.642857142857143) internal successors, (237), 41 states have internal predecessors, (237), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:22:29,608 INFO L276 IsEmpty]: Start isEmpty. Operand 225 states and 227 transitions. [2021-11-20 23:22:29,609 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 225 [2021-11-20 23:22:29,609 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:22:29,610 INFO L514 BasicCegarLoop]: trace histogram [37, 36, 36, 36, 36, 35, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:22:29,634 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (43)] Forceful destruction successful, exit code 0 [2021-11-20 23:22:29,820 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 43 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable44 [2021-11-20 23:22:29,820 INFO L402 AbstractCegarLoop]: === Iteration 46 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:22:29,820 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:22:29,820 INFO L85 PathProgramCache]: Analyzing trace with hash 1516925547, now seen corresponding path program 43 times [2021-11-20 23:22:29,820 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:22:29,820 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [52679355] [2021-11-20 23:22:29,820 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:22:29,821 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:22:29,873 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:22:31,405 INFO L134 CoverageAnalysis]: Checked inductivity of 3852 backedges. 2487 proven. 1365 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:22:31,406 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:22:31,406 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [52679355] [2021-11-20 23:22:31,406 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [52679355] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:22:31,406 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [502676813] [2021-11-20 23:22:31,406 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-20 23:22:31,406 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:22:31,406 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:22:31,407 INFO L229 MonitoredProcess]: Starting monitored process 44 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:22:31,408 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (44)] Waiting until timeout for monitored process [2021-11-20 23:22:31,513 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:22:31,516 INFO L263 TraceCheckSpWp]: Trace formula consists of 829 conjuncts, 74 conjunts are in the unsatisfiable core [2021-11-20 23:22:31,519 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:22:33,839 INFO L134 CoverageAnalysis]: Checked inductivity of 3852 backedges. 2590 proven. 1260 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-20 23:22:33,839 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:22:34,303 INFO L134 CoverageAnalysis]: Checked inductivity of 3852 backedges. 2590 proven. 1260 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-20 23:22:34,303 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [502676813] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:22:34,303 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [795412936] [2021-11-20 23:22:34,304 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-20 23:22:34,304 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:22:34,304 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:22:34,304 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:22:34,304 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:22:35,578 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:22:36,239 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:22:36,239 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:22:36,239 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [75, 74, 74] total 113 [2021-11-20 23:22:36,239 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1772912354] [2021-11-20 23:22:36,239 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:22:36,240 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 113 states [2021-11-20 23:22:36,240 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:22:36,241 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 113 interpolants. [2021-11-20 23:22:36,242 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2953, Invalid=11809, Unknown=0, NotChecked=0, Total=14762 [2021-11-20 23:22:36,242 INFO L87 Difference]: Start difference. First operand 225 states and 227 transitions. Second operand has 113 states, 113 states have (on average 3.327433628318584) internal successors, (376), 113 states have internal predecessors, (376), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:22:37,630 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:22:37,630 INFO L93 Difference]: Finished difference Result 484 states and 523 transitions. [2021-11-20 23:22:37,630 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 74 states. [2021-11-20 23:22:37,630 INFO L78 Accepts]: Start accepts. Automaton has has 113 states, 113 states have (on average 3.327433628318584) internal successors, (376), 113 states have internal predecessors, (376), 0 states have call successors, (0), 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 224 [2021-11-20 23:22:37,630 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:22:37,631 INFO L225 Difference]: With dead ends: 484 [2021-11-20 23:22:37,631 INFO L226 Difference]: Without dead ends: 335 [2021-11-20 23:22:37,633 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 781 GetRequests, 625 SyntacticMatches, 0 SemanticMatches, 156 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6189 ImplicationChecksByTransitivity, 4.4s TimeCoverageRelationStatistics Valid=5619, Invalid=19187, Unknown=0, NotChecked=0, Total=24806 [2021-11-20 23:22:37,633 INFO L933 BasicCegarLoop]: 74 mSDtfsCounter, 332 mSDsluCounter, 797 mSDsCounter, 0 mSdLazyCounter, 905 mSolverCounterSat, 336 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 332 SdHoareTripleChecker+Valid, 871 SdHoareTripleChecker+Invalid, 1241 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 336 IncrementalHoareTripleChecker+Valid, 905 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-20 23:22:37,633 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [332 Valid, 871 Invalid, 1241 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [336 Valid, 905 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-20 23:22:37,634 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 335 states. [2021-11-20 23:22:37,656 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 335 to 227. [2021-11-20 23:22:37,656 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 227 states, 226 states have (on average 1.0132743362831858) internal successors, (229), 226 states have internal predecessors, (229), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:22:37,657 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 227 states to 227 states and 229 transitions. [2021-11-20 23:22:37,657 INFO L78 Accepts]: Start accepts. Automaton has 227 states and 229 transitions. Word has length 224 [2021-11-20 23:22:37,657 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:22:37,658 INFO L470 AbstractCegarLoop]: Abstraction has 227 states and 229 transitions. [2021-11-20 23:22:37,658 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 113 states, 113 states have (on average 3.327433628318584) internal successors, (376), 113 states have internal predecessors, (376), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:22:37,658 INFO L276 IsEmpty]: Start isEmpty. Operand 227 states and 229 transitions. [2021-11-20 23:22:37,659 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 227 [2021-11-20 23:22:37,659 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:22:37,660 INFO L514 BasicCegarLoop]: trace histogram [37, 37, 36, 36, 36, 36, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:22:37,694 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (44)] Forceful destruction successful, exit code 0 [2021-11-20 23:22:37,874 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 44 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable45 [2021-11-20 23:22:37,875 INFO L402 AbstractCegarLoop]: === Iteration 47 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:22:37,875 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:22:37,875 INFO L85 PathProgramCache]: Analyzing trace with hash 297901008, now seen corresponding path program 44 times [2021-11-20 23:22:37,875 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:22:37,875 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [43383460] [2021-11-20 23:22:37,875 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:22:37,875 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:22:37,925 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:22:39,458 INFO L134 CoverageAnalysis]: Checked inductivity of 3924 backedges. 2487 proven. 1437 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:22:39,458 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:22:39,458 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [43383460] [2021-11-20 23:22:39,458 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [43383460] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:22:39,458 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1854964239] [2021-11-20 23:22:39,458 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-20 23:22:39,458 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:22:39,458 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:22:39,459 INFO L229 MonitoredProcess]: Starting monitored process 45 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:22:39,460 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (45)] Waiting until timeout for monitored process [2021-11-20 23:22:39,686 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 37 check-sat command(s) [2021-11-20 23:22:39,686 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:22:39,692 INFO L263 TraceCheckSpWp]: Trace formula consists of 839 conjuncts, 76 conjunts are in the unsatisfiable core [2021-11-20 23:22:39,696 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:22:42,141 INFO L134 CoverageAnalysis]: Checked inductivity of 3924 backedges. 2592 proven. 1332 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:22:42,141 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:22:42,640 INFO L134 CoverageAnalysis]: Checked inductivity of 3924 backedges. 2592 proven. 1332 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:22:42,641 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1854964239] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:22:42,641 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1375820142] [2021-11-20 23:22:42,642 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-20 23:22:42,642 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:22:42,642 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:22:42,643 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:22:42,643 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:22:43,948 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:22:44,608 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:22:44,608 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:22:44,608 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [76, 76, 76] total 115 [2021-11-20 23:22:44,608 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [492868753] [2021-11-20 23:22:44,609 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:22:44,609 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 115 states [2021-11-20 23:22:44,610 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:22:44,610 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 115 interpolants. [2021-11-20 23:22:44,612 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3069, Invalid=12183, Unknown=0, NotChecked=0, Total=15252 [2021-11-20 23:22:44,612 INFO L87 Difference]: Start difference. First operand 227 states and 229 transitions. Second operand has 115 states, 115 states have (on average 3.2869565217391306) internal successors, (378), 115 states have internal predecessors, (378), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:22:46,105 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:22:46,105 INFO L93 Difference]: Finished difference Result 491 states and 531 transitions. [2021-11-20 23:22:46,105 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 76 states. [2021-11-20 23:22:46,107 INFO L78 Accepts]: Start accepts. Automaton has has 115 states, 115 states have (on average 3.2869565217391306) internal successors, (378), 115 states have internal predecessors, (378), 0 states have call successors, (0), 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 226 [2021-11-20 23:22:46,107 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:22:46,109 INFO L225 Difference]: With dead ends: 491 [2021-11-20 23:22:46,109 INFO L226 Difference]: Without dead ends: 340 [2021-11-20 23:22:46,111 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 789 GetRequests, 630 SyntacticMatches, 0 SemanticMatches, 159 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6370 ImplicationChecksByTransitivity, 4.5s TimeCoverageRelationStatistics Valid=5883, Invalid=19877, Unknown=0, NotChecked=0, Total=25760 [2021-11-20 23:22:46,111 INFO L933 BasicCegarLoop]: 76 mSDtfsCounter, 281 mSDsluCounter, 842 mSDsCounter, 0 mSdLazyCounter, 959 mSolverCounterSat, 238 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 281 SdHoareTripleChecker+Valid, 918 SdHoareTripleChecker+Invalid, 1197 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 238 IncrementalHoareTripleChecker+Valid, 959 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-20 23:22:46,112 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [281 Valid, 918 Invalid, 1197 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [238 Valid, 959 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-20 23:22:46,112 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 340 states. [2021-11-20 23:22:46,133 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 340 to 229. [2021-11-20 23:22:46,134 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 229 states, 228 states have (on average 1.013157894736842) internal successors, (231), 228 states have internal predecessors, (231), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:22:46,134 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 229 states to 229 states and 231 transitions. [2021-11-20 23:22:46,134 INFO L78 Accepts]: Start accepts. Automaton has 229 states and 231 transitions. Word has length 226 [2021-11-20 23:22:46,134 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:22:46,134 INFO L470 AbstractCegarLoop]: Abstraction has 229 states and 231 transitions. [2021-11-20 23:22:46,135 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 115 states, 115 states have (on average 3.2869565217391306) internal successors, (378), 115 states have internal predecessors, (378), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:22:46,135 INFO L276 IsEmpty]: Start isEmpty. Operand 229 states and 231 transitions. [2021-11-20 23:22:46,136 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 229 [2021-11-20 23:22:46,136 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:22:46,136 INFO L514 BasicCegarLoop]: trace histogram [38, 37, 37, 36, 36, 36, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:22:46,174 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (45)] Forceful destruction successful, exit code 0 [2021-11-20 23:22:46,362 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 45 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable46 [2021-11-20 23:22:46,363 INFO L402 AbstractCegarLoop]: === Iteration 48 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:22:46,363 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:22:46,363 INFO L85 PathProgramCache]: Analyzing trace with hash 1341390837, now seen corresponding path program 45 times [2021-11-20 23:22:46,363 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:22:46,363 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1797696810] [2021-11-20 23:22:46,363 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:22:46,363 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:22:46,419 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:22:47,046 INFO L134 CoverageAnalysis]: Checked inductivity of 3998 backedges. 1332 proven. 2666 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:22:47,046 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:22:47,046 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1797696810] [2021-11-20 23:22:47,046 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1797696810] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:22:47,046 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1845634408] [2021-11-20 23:22:47,047 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-20 23:22:47,047 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:22:47,047 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:22:47,049 INFO L229 MonitoredProcess]: Starting monitored process 46 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:22:47,053 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (46)] Waiting until timeout for monitored process [2021-11-20 23:22:47,163 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-20 23:22:47,163 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:22:47,167 INFO L263 TraceCheckSpWp]: Trace formula consists of 849 conjuncts, 77 conjunts are in the unsatisfiable core [2021-11-20 23:22:47,170 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:22:47,610 INFO L134 CoverageAnalysis]: Checked inductivity of 3998 backedges. 1406 proven. 2592 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:22:47,610 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:22:48,061 INFO L134 CoverageAnalysis]: Checked inductivity of 3998 backedges. 1406 proven. 2592 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:22:48,062 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1845634408] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:22:48,062 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1083736914] [2021-11-20 23:22:48,063 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-20 23:22:48,063 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:22:48,063 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:22:48,063 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:22:48,063 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:22:49,091 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:22:49,472 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:22:49,472 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:22:49,472 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [40, 40, 40] total 43 [2021-11-20 23:22:49,472 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1370907916] [2021-11-20 23:22:49,472 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:22:49,473 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 44 states [2021-11-20 23:22:49,473 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:22:49,473 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2021-11-20 23:22:49,473 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=875, Invalid=1881, Unknown=0, NotChecked=0, Total=2756 [2021-11-20 23:22:49,473 INFO L87 Difference]: Start difference. First operand 229 states and 231 transitions. Second operand has 44 states, 44 states have (on average 5.659090909090909) internal successors, (249), 43 states have internal predecessors, (249), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:22:50,235 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:22:50,235 INFO L93 Difference]: Finished difference Result 246 states and 249 transitions. [2021-11-20 23:22:50,235 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 82 states. [2021-11-20 23:22:50,235 INFO L78 Accepts]: Start accepts. Automaton has has 44 states, 44 states have (on average 5.659090909090909) internal successors, (249), 43 states have internal predecessors, (249), 0 states have call successors, (0), 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 228 [2021-11-20 23:22:50,236 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:22:50,237 INFO L225 Difference]: With dead ends: 246 [2021-11-20 23:22:50,237 INFO L226 Difference]: Without dead ends: 244 [2021-11-20 23:22:50,238 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 798 GetRequests, 706 SyntacticMatches, 1 SemanticMatches, 91 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2395 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=2600, Invalid=5956, Unknown=0, NotChecked=0, Total=8556 [2021-11-20 23:22:50,239 INFO L933 BasicCegarLoop]: 46 mSDtfsCounter, 208 mSDsluCounter, 306 mSDsCounter, 0 mSdLazyCounter, 400 mSolverCounterSat, 157 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 208 SdHoareTripleChecker+Valid, 345 SdHoareTripleChecker+Invalid, 557 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 157 IncrementalHoareTripleChecker+Valid, 400 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-20 23:22:50,239 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [208 Valid, 345 Invalid, 557 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [157 Valid, 400 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-20 23:22:50,240 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 244 states. [2021-11-20 23:22:50,265 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 244 to 237. [2021-11-20 23:22:50,265 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 237 states, 236 states have (on average 1.0127118644067796) internal successors, (239), 236 states have internal predecessors, (239), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:22:50,266 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 237 states to 237 states and 239 transitions. [2021-11-20 23:22:50,266 INFO L78 Accepts]: Start accepts. Automaton has 237 states and 239 transitions. Word has length 228 [2021-11-20 23:22:50,267 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:22:50,267 INFO L470 AbstractCegarLoop]: Abstraction has 237 states and 239 transitions. [2021-11-20 23:22:50,267 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 44 states, 44 states have (on average 5.659090909090909) internal successors, (249), 43 states have internal predecessors, (249), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:22:50,267 INFO L276 IsEmpty]: Start isEmpty. Operand 237 states and 239 transitions. [2021-11-20 23:22:50,268 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 237 [2021-11-20 23:22:50,268 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:22:50,269 INFO L514 BasicCegarLoop]: trace histogram [39, 38, 38, 38, 38, 37, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:22:50,299 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (46)] Ended with exit code 0 [2021-11-20 23:22:50,494 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 46 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable47 [2021-11-20 23:22:50,495 INFO L402 AbstractCegarLoop]: === Iteration 49 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:22:50,495 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:22:50,495 INFO L85 PathProgramCache]: Analyzing trace with hash 1724878043, now seen corresponding path program 46 times [2021-11-20 23:22:50,495 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:22:50,495 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [916899401] [2021-11-20 23:22:50,495 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:22:50,496 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:22:50,556 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:22:52,181 INFO L134 CoverageAnalysis]: Checked inductivity of 4294 backedges. 2777 proven. 1517 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:22:52,182 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:22:52,182 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [916899401] [2021-11-20 23:22:52,182 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [916899401] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:22:52,182 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1905583016] [2021-11-20 23:22:52,182 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-20 23:22:52,182 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:22:52,183 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:22:52,183 INFO L229 MonitoredProcess]: Starting monitored process 47 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:22:52,184 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (47)] Waiting until timeout for monitored process [2021-11-20 23:22:52,292 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:22:52,296 INFO L263 TraceCheckSpWp]: Trace formula consists of 873 conjuncts, 78 conjunts are in the unsatisfiable core [2021-11-20 23:22:52,298 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:22:54,837 INFO L134 CoverageAnalysis]: Checked inductivity of 4294 backedges. 2886 proven. 1406 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-20 23:22:54,837 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:22:55,280 INFO L134 CoverageAnalysis]: Checked inductivity of 4294 backedges. 2886 proven. 1406 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-20 23:22:55,280 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1905583016] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:22:55,280 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1487414543] [2021-11-20 23:22:55,281 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-20 23:22:55,281 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:22:55,281 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:22:55,281 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:22:55,281 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:22:56,533 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:22:57,237 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:22:57,237 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:22:57,238 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [79, 78, 78] total 119 [2021-11-20 23:22:57,238 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1766647002] [2021-11-20 23:22:57,238 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:22:57,238 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 119 states [2021-11-20 23:22:57,238 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:22:57,239 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 119 interpolants. [2021-11-20 23:22:57,239 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3267, Invalid=12989, Unknown=0, NotChecked=0, Total=16256 [2021-11-20 23:22:57,240 INFO L87 Difference]: Start difference. First operand 237 states and 239 transitions. Second operand has 119 states, 119 states have (on average 3.327731092436975) internal successors, (396), 119 states have internal predecessors, (396), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:22:58,761 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:22:58,761 INFO L93 Difference]: Finished difference Result 510 states and 551 transitions. [2021-11-20 23:22:58,761 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 78 states. [2021-11-20 23:22:58,761 INFO L78 Accepts]: Start accepts. Automaton has has 119 states, 119 states have (on average 3.327731092436975) internal successors, (396), 119 states have internal predecessors, (396), 0 states have call successors, (0), 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 236 [2021-11-20 23:22:58,761 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:22:58,763 INFO L225 Difference]: With dead ends: 510 [2021-11-20 23:22:58,763 INFO L226 Difference]: Without dead ends: 353 [2021-11-20 23:22:58,765 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 823 GetRequests, 659 SyntacticMatches, 0 SemanticMatches, 164 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6798 ImplicationChecksByTransitivity, 4.7s TimeCoverageRelationStatistics Valid=6233, Invalid=21157, Unknown=0, NotChecked=0, Total=27390 [2021-11-20 23:22:58,765 INFO L933 BasicCegarLoop]: 78 mSDtfsCounter, 382 mSDsluCounter, 724 mSDsCounter, 0 mSdLazyCounter, 848 mSolverCounterSat, 408 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 382 SdHoareTripleChecker+Valid, 802 SdHoareTripleChecker+Invalid, 1256 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 408 IncrementalHoareTripleChecker+Valid, 848 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-20 23:22:58,765 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [382 Valid, 802 Invalid, 1256 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [408 Valid, 848 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-20 23:22:58,766 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 353 states. [2021-11-20 23:22:58,791 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 353 to 239. [2021-11-20 23:22:58,791 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 239 states, 238 states have (on average 1.0126050420168067) internal successors, (241), 238 states have internal predecessors, (241), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:22:58,792 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 239 states to 239 states and 241 transitions. [2021-11-20 23:22:58,792 INFO L78 Accepts]: Start accepts. Automaton has 239 states and 241 transitions. Word has length 236 [2021-11-20 23:22:58,792 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:22:58,793 INFO L470 AbstractCegarLoop]: Abstraction has 239 states and 241 transitions. [2021-11-20 23:22:58,793 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 119 states, 119 states have (on average 3.327731092436975) internal successors, (396), 119 states have internal predecessors, (396), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:22:58,793 INFO L276 IsEmpty]: Start isEmpty. Operand 239 states and 241 transitions. [2021-11-20 23:22:58,794 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 239 [2021-11-20 23:22:58,794 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:22:58,795 INFO L514 BasicCegarLoop]: trace histogram [39, 39, 38, 38, 38, 38, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:22:58,830 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (47)] Ended with exit code 0 [2021-11-20 23:22:59,008 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 47 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable48 [2021-11-20 23:22:59,008 INFO L402 AbstractCegarLoop]: === Iteration 50 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:22:59,008 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:22:59,008 INFO L85 PathProgramCache]: Analyzing trace with hash -379402560, now seen corresponding path program 47 times [2021-11-20 23:22:59,008 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:22:59,008 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2135865622] [2021-11-20 23:22:59,008 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:22:59,008 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:22:59,094 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:23:00,770 INFO L134 CoverageAnalysis]: Checked inductivity of 4370 backedges. 2777 proven. 1593 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:23:00,771 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:23:00,771 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2135865622] [2021-11-20 23:23:00,771 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2135865622] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:23:00,771 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1972300651] [2021-11-20 23:23:00,771 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-20 23:23:00,771 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:23:00,771 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:23:00,772 INFO L229 MonitoredProcess]: Starting monitored process 48 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:23:00,773 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (48)] Waiting until timeout for monitored process [2021-11-20 23:23:00,957 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 39 check-sat command(s) [2021-11-20 23:23:00,957 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:23:00,962 INFO L263 TraceCheckSpWp]: Trace formula consists of 883 conjuncts, 80 conjunts are in the unsatisfiable core [2021-11-20 23:23:00,964 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:23:03,603 INFO L134 CoverageAnalysis]: Checked inductivity of 4370 backedges. 2888 proven. 1482 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:23:03,603 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:23:04,059 INFO L134 CoverageAnalysis]: Checked inductivity of 4370 backedges. 2888 proven. 1482 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:23:04,059 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1972300651] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:23:04,059 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [85972252] [2021-11-20 23:23:04,060 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-20 23:23:04,060 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:23:04,060 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:23:04,060 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:23:04,060 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:23:05,344 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:23:06,039 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:23:06,039 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:23:06,039 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [80, 80, 80] total 121 [2021-11-20 23:23:06,039 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1328825480] [2021-11-20 23:23:06,039 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:23:06,040 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 121 states [2021-11-20 23:23:06,040 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:23:06,041 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 121 interpolants. [2021-11-20 23:23:06,041 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3389, Invalid=13381, Unknown=0, NotChecked=0, Total=16770 [2021-11-20 23:23:06,041 INFO L87 Difference]: Start difference. First operand 239 states and 241 transitions. Second operand has 121 states, 121 states have (on average 3.2892561983471076) internal successors, (398), 121 states have internal predecessors, (398), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:23:07,544 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:23:07,544 INFO L93 Difference]: Finished difference Result 517 states and 559 transitions. [2021-11-20 23:23:07,544 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 80 states. [2021-11-20 23:23:07,544 INFO L78 Accepts]: Start accepts. Automaton has has 121 states, 121 states have (on average 3.2892561983471076) internal successors, (398), 121 states have internal predecessors, (398), 0 states have call successors, (0), 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 238 [2021-11-20 23:23:07,544 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:23:07,545 INFO L225 Difference]: With dead ends: 517 [2021-11-20 23:23:07,546 INFO L226 Difference]: Without dead ends: 358 [2021-11-20 23:23:07,548 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 831 GetRequests, 664 SyntacticMatches, 0 SemanticMatches, 167 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6987 ImplicationChecksByTransitivity, 4.9s TimeCoverageRelationStatistics Valid=6511, Invalid=21881, Unknown=0, NotChecked=0, Total=28392 [2021-11-20 23:23:07,548 INFO L933 BasicCegarLoop]: 80 mSDtfsCounter, 343 mSDsluCounter, 773 mSDsCounter, 0 mSdLazyCounter, 892 mSolverCounterSat, 277 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 343 SdHoareTripleChecker+Valid, 853 SdHoareTripleChecker+Invalid, 1169 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 277 IncrementalHoareTripleChecker+Valid, 892 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-20 23:23:07,549 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [343 Valid, 853 Invalid, 1169 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [277 Valid, 892 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-20 23:23:07,549 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 358 states. [2021-11-20 23:23:07,575 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 358 to 241. [2021-11-20 23:23:07,576 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 241 states, 240 states have (on average 1.0125) internal successors, (243), 240 states have internal predecessors, (243), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:23:07,577 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 241 states to 241 states and 243 transitions. [2021-11-20 23:23:07,577 INFO L78 Accepts]: Start accepts. Automaton has 241 states and 243 transitions. Word has length 238 [2021-11-20 23:23:07,577 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:23:07,577 INFO L470 AbstractCegarLoop]: Abstraction has 241 states and 243 transitions. [2021-11-20 23:23:07,578 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 121 states, 121 states have (on average 3.2892561983471076) internal successors, (398), 121 states have internal predecessors, (398), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:23:07,578 INFO L276 IsEmpty]: Start isEmpty. Operand 241 states and 243 transitions. [2021-11-20 23:23:07,579 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 241 [2021-11-20 23:23:07,579 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:23:07,579 INFO L514 BasicCegarLoop]: trace histogram [40, 39, 39, 38, 38, 38, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:23:07,610 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (48)] Forceful destruction successful, exit code 0 [2021-11-20 23:23:07,794 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 48 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable49 [2021-11-20 23:23:07,795 INFO L402 AbstractCegarLoop]: === Iteration 51 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:23:07,795 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:23:07,795 INFO L85 PathProgramCache]: Analyzing trace with hash 336534373, now seen corresponding path program 48 times [2021-11-20 23:23:07,795 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:23:07,795 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1856854919] [2021-11-20 23:23:07,795 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:23:07,795 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:23:07,849 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:23:08,602 INFO L134 CoverageAnalysis]: Checked inductivity of 4448 backedges. 1482 proven. 2966 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:23:08,603 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:23:08,603 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1856854919] [2021-11-20 23:23:08,603 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1856854919] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:23:08,603 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1873774028] [2021-11-20 23:23:08,603 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-20 23:23:08,603 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:23:08,603 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:23:08,604 INFO L229 MonitoredProcess]: Starting monitored process 49 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:23:08,604 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (49)] Waiting until timeout for monitored process [2021-11-20 23:23:08,722 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-20 23:23:08,722 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:23:08,726 INFO L263 TraceCheckSpWp]: Trace formula consists of 893 conjuncts, 81 conjunts are in the unsatisfiable core [2021-11-20 23:23:08,730 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:23:09,187 INFO L134 CoverageAnalysis]: Checked inductivity of 4448 backedges. 1560 proven. 2888 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:23:09,187 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:23:09,651 INFO L134 CoverageAnalysis]: Checked inductivity of 4448 backedges. 1560 proven. 2888 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:23:09,651 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1873774028] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:23:09,652 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [484650587] [2021-11-20 23:23:09,652 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-20 23:23:09,652 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:23:09,652 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:23:09,653 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:23:09,653 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:23:10,726 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:23:11,129 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:23:11,129 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:23:11,130 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [42, 42, 42] total 45 [2021-11-20 23:23:11,130 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1323563782] [2021-11-20 23:23:11,130 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:23:11,130 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 46 states [2021-11-20 23:23:11,130 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:23:11,131 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 46 interpolants. [2021-11-20 23:23:11,131 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=958, Invalid=2012, Unknown=0, NotChecked=0, Total=2970 [2021-11-20 23:23:11,131 INFO L87 Difference]: Start difference. First operand 241 states and 243 transitions. Second operand has 46 states, 46 states have (on average 5.673913043478261) internal successors, (261), 45 states have internal predecessors, (261), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:23:11,905 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:23:11,905 INFO L93 Difference]: Finished difference Result 258 states and 261 transitions. [2021-11-20 23:23:11,905 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 86 states. [2021-11-20 23:23:11,906 INFO L78 Accepts]: Start accepts. Automaton has has 46 states, 46 states have (on average 5.673913043478261) internal successors, (261), 45 states have internal predecessors, (261), 0 states have call successors, (0), 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 240 [2021-11-20 23:23:11,906 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:23:11,908 INFO L225 Difference]: With dead ends: 258 [2021-11-20 23:23:11,908 INFO L226 Difference]: Without dead ends: 256 [2021-11-20 23:23:11,908 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 840 GetRequests, 744 SyntacticMatches, 1 SemanticMatches, 95 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2599 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=2853, Invalid=6459, Unknown=0, NotChecked=0, Total=9312 [2021-11-20 23:23:11,909 INFO L933 BasicCegarLoop]: 48 mSDtfsCounter, 304 mSDsluCounter, 249 mSDsCounter, 0 mSdLazyCounter, 353 mSolverCounterSat, 205 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 304 SdHoareTripleChecker+Valid, 292 SdHoareTripleChecker+Invalid, 558 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 205 IncrementalHoareTripleChecker+Valid, 353 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-20 23:23:11,909 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [304 Valid, 292 Invalid, 558 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [205 Valid, 353 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-20 23:23:11,910 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 256 states. [2021-11-20 23:23:11,937 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 256 to 249. [2021-11-20 23:23:11,938 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 249 states, 248 states have (on average 1.0120967741935485) internal successors, (251), 248 states have internal predecessors, (251), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:23:11,938 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 249 states to 249 states and 251 transitions. [2021-11-20 23:23:11,938 INFO L78 Accepts]: Start accepts. Automaton has 249 states and 251 transitions. Word has length 240 [2021-11-20 23:23:11,939 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:23:11,939 INFO L470 AbstractCegarLoop]: Abstraction has 249 states and 251 transitions. [2021-11-20 23:23:11,939 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 46 states, 46 states have (on average 5.673913043478261) internal successors, (261), 45 states have internal predecessors, (261), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:23:11,939 INFO L276 IsEmpty]: Start isEmpty. Operand 249 states and 251 transitions. [2021-11-20 23:23:11,940 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 249 [2021-11-20 23:23:11,941 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:23:11,941 INFO L514 BasicCegarLoop]: trace histogram [41, 40, 40, 40, 40, 39, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:23:11,979 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (49)] Forceful destruction successful, exit code 0 [2021-11-20 23:23:12,160 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable50,49 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:23:12,161 INFO L402 AbstractCegarLoop]: === Iteration 52 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:23:12,161 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:23:12,161 INFO L85 PathProgramCache]: Analyzing trace with hash -175097781, now seen corresponding path program 49 times [2021-11-20 23:23:12,161 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:23:12,161 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1650251545] [2021-11-20 23:23:12,161 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:23:12,161 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:23:12,227 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:23:14,056 INFO L134 CoverageAnalysis]: Checked inductivity of 4760 backedges. 3083 proven. 1677 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:23:14,056 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:23:14,056 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1650251545] [2021-11-20 23:23:14,056 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1650251545] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:23:14,056 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [152778100] [2021-11-20 23:23:14,056 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-20 23:23:14,056 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:23:14,057 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:23:14,057 INFO L229 MonitoredProcess]: Starting monitored process 50 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:23:14,059 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (50)] Waiting until timeout for monitored process [2021-11-20 23:23:14,174 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:23:14,178 INFO L263 TraceCheckSpWp]: Trace formula consists of 917 conjuncts, 82 conjunts are in the unsatisfiable core [2021-11-20 23:23:14,180 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:23:16,945 INFO L134 CoverageAnalysis]: Checked inductivity of 4760 backedges. 3198 proven. 1560 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-20 23:23:16,945 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:23:17,406 INFO L134 CoverageAnalysis]: Checked inductivity of 4760 backedges. 3198 proven. 1560 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-20 23:23:17,406 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [152778100] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:23:17,406 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1358563392] [2021-11-20 23:23:17,407 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-20 23:23:17,407 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:23:17,407 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:23:17,407 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:23:17,407 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:23:18,660 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:23:19,376 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:23:19,376 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:23:19,376 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [83, 82, 82] total 125 [2021-11-20 23:23:19,376 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [311841670] [2021-11-20 23:23:19,377 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:23:19,377 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 125 states [2021-11-20 23:23:19,377 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:23:19,378 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 125 interpolants. [2021-11-20 23:23:19,379 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3597, Invalid=14225, Unknown=0, NotChecked=0, Total=17822 [2021-11-20 23:23:19,379 INFO L87 Difference]: Start difference. First operand 249 states and 251 transitions. Second operand has 125 states, 125 states have (on average 3.328) internal successors, (416), 125 states have internal predecessors, (416), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:23:21,021 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:23:21,022 INFO L93 Difference]: Finished difference Result 536 states and 579 transitions. [2021-11-20 23:23:21,022 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 82 states. [2021-11-20 23:23:21,022 INFO L78 Accepts]: Start accepts. Automaton has has 125 states, 125 states have (on average 3.328) internal successors, (416), 125 states have internal predecessors, (416), 0 states have call successors, (0), 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 248 [2021-11-20 23:23:21,022 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:23:21,023 INFO L225 Difference]: With dead ends: 536 [2021-11-20 23:23:21,024 INFO L226 Difference]: Without dead ends: 371 [2021-11-20 23:23:21,025 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 865 GetRequests, 693 SyntacticMatches, 0 SemanticMatches, 172 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7435 ImplicationChecksByTransitivity, 5.2s TimeCoverageRelationStatistics Valid=6879, Invalid=23223, Unknown=0, NotChecked=0, Total=30102 [2021-11-20 23:23:21,026 INFO L933 BasicCegarLoop]: 82 mSDtfsCounter, 465 mSDsluCounter, 694 mSDsCounter, 0 mSdLazyCounter, 815 mSolverCounterSat, 503 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 465 SdHoareTripleChecker+Valid, 776 SdHoareTripleChecker+Invalid, 1318 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 503 IncrementalHoareTripleChecker+Valid, 815 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-20 23:23:21,026 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [465 Valid, 776 Invalid, 1318 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [503 Valid, 815 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-20 23:23:21,027 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 371 states. [2021-11-20 23:23:21,045 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 371 to 251. [2021-11-20 23:23:21,045 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 251 states, 250 states have (on average 1.012) internal successors, (253), 250 states have internal predecessors, (253), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:23:21,046 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 251 states to 251 states and 253 transitions. [2021-11-20 23:23:21,046 INFO L78 Accepts]: Start accepts. Automaton has 251 states and 253 transitions. Word has length 248 [2021-11-20 23:23:21,046 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:23:21,046 INFO L470 AbstractCegarLoop]: Abstraction has 251 states and 253 transitions. [2021-11-20 23:23:21,046 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 125 states, 125 states have (on average 3.328) internal successors, (416), 125 states have internal predecessors, (416), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:23:21,046 INFO L276 IsEmpty]: Start isEmpty. Operand 251 states and 253 transitions. [2021-11-20 23:23:21,047 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 251 [2021-11-20 23:23:21,047 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:23:21,047 INFO L514 BasicCegarLoop]: trace histogram [41, 41, 40, 40, 40, 40, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:23:21,070 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (50)] Forceful destruction successful, exit code 0 [2021-11-20 23:23:21,247 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable51,50 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:23:21,248 INFO L402 AbstractCegarLoop]: === Iteration 53 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:23:21,248 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:23:21,248 INFO L85 PathProgramCache]: Analyzing trace with hash -1152728400, now seen corresponding path program 50 times [2021-11-20 23:23:21,248 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:23:21,248 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [468659810] [2021-11-20 23:23:21,248 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:23:21,248 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:23:21,309 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:23:23,124 INFO L134 CoverageAnalysis]: Checked inductivity of 4840 backedges. 3083 proven. 1757 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:23:23,125 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:23:23,125 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [468659810] [2021-11-20 23:23:23,125 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [468659810] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:23:23,125 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1044697452] [2021-11-20 23:23:23,125 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-20 23:23:23,125 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:23:23,125 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:23:23,127 INFO L229 MonitoredProcess]: Starting monitored process 51 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:23:23,127 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (51)] Waiting until timeout for monitored process [2021-11-20 23:23:23,326 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 41 check-sat command(s) [2021-11-20 23:23:23,326 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:23:23,334 INFO L263 TraceCheckSpWp]: Trace formula consists of 927 conjuncts, 84 conjunts are in the unsatisfiable core [2021-11-20 23:23:23,338 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:23:26,233 INFO L134 CoverageAnalysis]: Checked inductivity of 4840 backedges. 3200 proven. 1640 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:23:26,233 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:23:26,702 INFO L134 CoverageAnalysis]: Checked inductivity of 4840 backedges. 3200 proven. 1640 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:23:26,702 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1044697452] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:23:26,702 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [594945641] [2021-11-20 23:23:26,703 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-20 23:23:26,703 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:23:26,703 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:23:26,703 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:23:26,703 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:23:27,971 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:23:28,681 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:23:28,681 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:23:28,681 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [84, 84, 84] total 127 [2021-11-20 23:23:28,681 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [644993415] [2021-11-20 23:23:28,681 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:23:28,682 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 127 states [2021-11-20 23:23:28,682 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:23:28,683 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 127 interpolants. [2021-11-20 23:23:28,683 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3725, Invalid=14635, Unknown=0, NotChecked=0, Total=18360 [2021-11-20 23:23:28,684 INFO L87 Difference]: Start difference. First operand 251 states and 253 transitions. Second operand has 127 states, 127 states have (on average 3.2913385826771653) internal successors, (418), 127 states have internal predecessors, (418), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:23:30,375 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:23:30,375 INFO L93 Difference]: Finished difference Result 543 states and 587 transitions. [2021-11-20 23:23:30,375 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 84 states. [2021-11-20 23:23:30,376 INFO L78 Accepts]: Start accepts. Automaton has has 127 states, 127 states have (on average 3.2913385826771653) internal successors, (418), 127 states have internal predecessors, (418), 0 states have call successors, (0), 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 250 [2021-11-20 23:23:30,376 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:23:30,377 INFO L225 Difference]: With dead ends: 543 [2021-11-20 23:23:30,377 INFO L226 Difference]: Without dead ends: 376 [2021-11-20 23:23:30,379 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 873 GetRequests, 698 SyntacticMatches, 0 SemanticMatches, 175 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7632 ImplicationChecksByTransitivity, 5.4s TimeCoverageRelationStatistics Valid=7171, Invalid=23981, Unknown=0, NotChecked=0, Total=31152 [2021-11-20 23:23:30,379 INFO L933 BasicCegarLoop]: 84 mSDtfsCounter, 352 mSDsluCounter, 879 mSDsCounter, 0 mSdLazyCounter, 1012 mSolverCounterSat, 326 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 352 SdHoareTripleChecker+Valid, 963 SdHoareTripleChecker+Invalid, 1338 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 326 IncrementalHoareTripleChecker+Valid, 1012 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-20 23:23:30,379 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [352 Valid, 963 Invalid, 1338 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [326 Valid, 1012 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-20 23:23:30,380 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 376 states. [2021-11-20 23:23:30,397 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 376 to 253. [2021-11-20 23:23:30,398 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 253 states, 252 states have (on average 1.0119047619047619) internal successors, (255), 252 states have internal predecessors, (255), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:23:30,398 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 253 states to 253 states and 255 transitions. [2021-11-20 23:23:30,398 INFO L78 Accepts]: Start accepts. Automaton has 253 states and 255 transitions. Word has length 250 [2021-11-20 23:23:30,398 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:23:30,398 INFO L470 AbstractCegarLoop]: Abstraction has 253 states and 255 transitions. [2021-11-20 23:23:30,399 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 127 states, 127 states have (on average 3.2913385826771653) internal successors, (418), 127 states have internal predecessors, (418), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:23:30,399 INFO L276 IsEmpty]: Start isEmpty. Operand 253 states and 255 transitions. [2021-11-20 23:23:30,400 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 253 [2021-11-20 23:23:30,400 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:23:30,400 INFO L514 BasicCegarLoop]: trace histogram [42, 41, 41, 40, 40, 40, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:23:30,435 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (51)] Forceful destruction successful, exit code 0 [2021-11-20 23:23:30,614 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 51 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable52 [2021-11-20 23:23:30,615 INFO L402 AbstractCegarLoop]: === Iteration 54 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:23:30,615 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:23:30,615 INFO L85 PathProgramCache]: Analyzing trace with hash -57915435, now seen corresponding path program 51 times [2021-11-20 23:23:30,615 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:23:30,615 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [490764538] [2021-11-20 23:23:30,615 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:23:30,616 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:23:30,721 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:23:31,647 INFO L134 CoverageAnalysis]: Checked inductivity of 4922 backedges. 1640 proven. 3282 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:23:31,648 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:23:31,648 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [490764538] [2021-11-20 23:23:31,648 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [490764538] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:23:31,648 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1397882504] [2021-11-20 23:23:31,648 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-20 23:23:31,648 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:23:31,648 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:23:31,649 INFO L229 MonitoredProcess]: Starting monitored process 52 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:23:31,668 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (52)] Waiting until timeout for monitored process [2021-11-20 23:23:31,808 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-20 23:23:31,808 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:23:31,815 INFO L263 TraceCheckSpWp]: Trace formula consists of 937 conjuncts, 85 conjunts are in the unsatisfiable core [2021-11-20 23:23:31,818 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:23:32,355 INFO L134 CoverageAnalysis]: Checked inductivity of 4922 backedges. 1722 proven. 3200 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:23:32,355 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:23:32,862 INFO L134 CoverageAnalysis]: Checked inductivity of 4922 backedges. 1722 proven. 3200 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:23:32,863 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1397882504] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:23:32,863 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1715707896] [2021-11-20 23:23:32,863 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-20 23:23:32,863 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:23:32,863 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:23:32,864 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:23:32,864 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:23:33,968 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:23:34,363 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:23:34,363 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:23:34,363 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [44, 44, 44] total 47 [2021-11-20 23:23:34,363 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1691239215] [2021-11-20 23:23:34,363 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:23:34,364 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 48 states [2021-11-20 23:23:34,364 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:23:34,364 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2021-11-20 23:23:34,364 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1045, Invalid=2147, Unknown=0, NotChecked=0, Total=3192 [2021-11-20 23:23:34,364 INFO L87 Difference]: Start difference. First operand 253 states and 255 transitions. Second operand has 48 states, 48 states have (on average 5.6875) internal successors, (273), 47 states have internal predecessors, (273), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:23:35,210 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:23:35,210 INFO L93 Difference]: Finished difference Result 270 states and 273 transitions. [2021-11-20 23:23:35,210 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 90 states. [2021-11-20 23:23:35,210 INFO L78 Accepts]: Start accepts. Automaton has has 48 states, 48 states have (on average 5.6875) internal successors, (273), 47 states have internal predecessors, (273), 0 states have call successors, (0), 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 252 [2021-11-20 23:23:35,211 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:23:35,212 INFO L225 Difference]: With dead ends: 270 [2021-11-20 23:23:35,212 INFO L226 Difference]: Without dead ends: 268 [2021-11-20 23:23:35,212 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 882 GetRequests, 782 SyntacticMatches, 1 SemanticMatches, 99 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2811 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=3118, Invalid=6982, Unknown=0, NotChecked=0, Total=10100 [2021-11-20 23:23:35,213 INFO L933 BasicCegarLoop]: 50 mSDtfsCounter, 317 mSDsluCounter, 271 mSDsCounter, 0 mSdLazyCounter, 379 mSolverCounterSat, 215 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 317 SdHoareTripleChecker+Valid, 316 SdHoareTripleChecker+Invalid, 594 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 215 IncrementalHoareTripleChecker+Valid, 379 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-20 23:23:35,213 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [317 Valid, 316 Invalid, 594 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [215 Valid, 379 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-20 23:23:35,213 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 268 states. [2021-11-20 23:23:35,243 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 268 to 261. [2021-11-20 23:23:35,244 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 261 states, 260 states have (on average 1.0115384615384615) internal successors, (263), 260 states have internal predecessors, (263), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:23:35,245 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 261 states to 261 states and 263 transitions. [2021-11-20 23:23:35,245 INFO L78 Accepts]: Start accepts. Automaton has 261 states and 263 transitions. Word has length 252 [2021-11-20 23:23:35,245 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:23:35,245 INFO L470 AbstractCegarLoop]: Abstraction has 261 states and 263 transitions. [2021-11-20 23:23:35,245 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 48 states, 48 states have (on average 5.6875) internal successors, (273), 47 states have internal predecessors, (273), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:23:35,246 INFO L276 IsEmpty]: Start isEmpty. Operand 261 states and 263 transitions. [2021-11-20 23:23:35,247 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 261 [2021-11-20 23:23:35,247 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:23:35,247 INFO L514 BasicCegarLoop]: trace histogram [43, 42, 42, 42, 42, 41, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:23:35,282 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (52)] Forceful destruction successful, exit code 0 [2021-11-20 23:23:35,473 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable53,52 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:23:35,474 INFO L402 AbstractCegarLoop]: === Iteration 55 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:23:35,474 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:23:35,474 INFO L85 PathProgramCache]: Analyzing trace with hash -1307446085, now seen corresponding path program 52 times [2021-11-20 23:23:35,474 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:23:35,474 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [207110528] [2021-11-20 23:23:35,474 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:23:35,474 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:23:35,536 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:23:37,486 INFO L134 CoverageAnalysis]: Checked inductivity of 5250 backedges. 3405 proven. 1845 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:23:37,486 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:23:37,486 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [207110528] [2021-11-20 23:23:37,486 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [207110528] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:23:37,486 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [272216054] [2021-11-20 23:23:37,487 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-20 23:23:37,487 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:23:37,487 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:23:37,489 INFO L229 MonitoredProcess]: Starting monitored process 53 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:23:37,490 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (53)] Waiting until timeout for monitored process [2021-11-20 23:23:37,605 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:23:37,610 INFO L263 TraceCheckSpWp]: Trace formula consists of 961 conjuncts, 86 conjunts are in the unsatisfiable core [2021-11-20 23:23:37,613 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:23:40,711 INFO L134 CoverageAnalysis]: Checked inductivity of 5250 backedges. 3526 proven. 1722 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-20 23:23:40,711 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:23:41,191 INFO L134 CoverageAnalysis]: Checked inductivity of 5250 backedges. 3526 proven. 1722 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-20 23:23:41,191 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [272216054] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:23:41,191 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [618879005] [2021-11-20 23:23:41,192 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-20 23:23:41,192 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:23:41,192 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:23:41,192 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:23:41,192 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:23:42,218 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:23:42,930 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:23:42,930 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:23:42,930 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [87, 86, 86] total 131 [2021-11-20 23:23:42,930 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1150422448] [2021-11-20 23:23:42,930 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:23:42,932 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 131 states [2021-11-20 23:23:42,932 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:23:42,933 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 131 interpolants. [2021-11-20 23:23:42,933 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3943, Invalid=15517, Unknown=0, NotChecked=0, Total=19460 [2021-11-20 23:23:42,934 INFO L87 Difference]: Start difference. First operand 261 states and 263 transitions. Second operand has 131 states, 131 states have (on average 3.3282442748091605) internal successors, (436), 131 states have internal predecessors, (436), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:23:44,740 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:23:44,741 INFO L93 Difference]: Finished difference Result 562 states and 607 transitions. [2021-11-20 23:23:44,741 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 86 states. [2021-11-20 23:23:44,741 INFO L78 Accepts]: Start accepts. Automaton has has 131 states, 131 states have (on average 3.3282442748091605) internal successors, (436), 131 states have internal predecessors, (436), 0 states have call successors, (0), 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 260 [2021-11-20 23:23:44,741 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:23:44,742 INFO L225 Difference]: With dead ends: 562 [2021-11-20 23:23:44,743 INFO L226 Difference]: Without dead ends: 389 [2021-11-20 23:23:44,744 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 907 GetRequests, 727 SyntacticMatches, 0 SemanticMatches, 180 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8100 ImplicationChecksByTransitivity, 5.6s TimeCoverageRelationStatistics Valid=7557, Invalid=25385, Unknown=0, NotChecked=0, Total=32942 [2021-11-20 23:23:44,744 INFO L933 BasicCegarLoop]: 86 mSDtfsCounter, 390 mSDsluCounter, 1009 mSDsCounter, 0 mSdLazyCounter, 1139 mSolverCounterSat, 351 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 390 SdHoareTripleChecker+Valid, 1095 SdHoareTripleChecker+Invalid, 1490 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 351 IncrementalHoareTripleChecker+Valid, 1139 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-20 23:23:44,744 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [390 Valid, 1095 Invalid, 1490 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [351 Valid, 1139 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-20 23:23:44,745 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 389 states. [2021-11-20 23:23:44,770 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 389 to 263. [2021-11-20 23:23:44,771 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 263 states, 262 states have (on average 1.0114503816793894) internal successors, (265), 262 states have internal predecessors, (265), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:23:44,771 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 263 states to 263 states and 265 transitions. [2021-11-20 23:23:44,771 INFO L78 Accepts]: Start accepts. Automaton has 263 states and 265 transitions. Word has length 260 [2021-11-20 23:23:44,771 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:23:44,771 INFO L470 AbstractCegarLoop]: Abstraction has 263 states and 265 transitions. [2021-11-20 23:23:44,771 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 131 states, 131 states have (on average 3.3282442748091605) internal successors, (436), 131 states have internal predecessors, (436), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:23:44,771 INFO L276 IsEmpty]: Start isEmpty. Operand 263 states and 265 transitions. [2021-11-20 23:23:44,773 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 263 [2021-11-20 23:23:44,773 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:23:44,773 INFO L514 BasicCegarLoop]: trace histogram [43, 43, 42, 42, 42, 42, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:23:44,812 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (53)] Forceful destruction successful, exit code 0 [2021-11-20 23:23:44,986 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 53 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable54 [2021-11-20 23:23:44,986 INFO L402 AbstractCegarLoop]: === Iteration 56 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:23:44,986 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:23:44,986 INFO L85 PathProgramCache]: Analyzing trace with hash 1811877792, now seen corresponding path program 53 times [2021-11-20 23:23:44,986 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:23:44,986 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1034729838] [2021-11-20 23:23:44,987 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:23:44,987 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:23:45,066 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:23:47,058 INFO L134 CoverageAnalysis]: Checked inductivity of 5334 backedges. 3405 proven. 1929 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:23:47,058 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:23:47,058 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1034729838] [2021-11-20 23:23:47,058 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1034729838] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:23:47,058 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [684213007] [2021-11-20 23:23:47,058 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-20 23:23:47,058 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:23:47,058 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:23:47,059 INFO L229 MonitoredProcess]: Starting monitored process 54 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:23:47,061 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (54)] Waiting until timeout for monitored process [2021-11-20 23:23:47,264 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 43 check-sat command(s) [2021-11-20 23:23:47,264 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:23:47,269 INFO L263 TraceCheckSpWp]: Trace formula consists of 971 conjuncts, 88 conjunts are in the unsatisfiable core [2021-11-20 23:23:47,273 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:23:49,579 INFO L134 CoverageAnalysis]: Checked inductivity of 5334 backedges. 1806 proven. 3528 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:23:49,579 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:23:50,094 INFO L134 CoverageAnalysis]: Checked inductivity of 5334 backedges. 1806 proven. 3528 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:23:50,095 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [684213007] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:23:50,095 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [829206081] [2021-11-20 23:23:50,095 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-20 23:23:50,095 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:23:50,096 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:23:50,096 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:23:50,096 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:23:51,489 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:23:52,259 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:23:52,259 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:23:52,260 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [88, 45, 45] total 132 [2021-11-20 23:23:52,260 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1895820538] [2021-11-20 23:23:52,260 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:23:52,260 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 132 states [2021-11-20 23:23:52,261 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:23:52,261 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 132 interpolants. [2021-11-20 23:23:52,262 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3047, Invalid=16693, Unknown=0, NotChecked=0, Total=19740 [2021-11-20 23:23:52,262 INFO L87 Difference]: Start difference. First operand 263 states and 265 transitions. Second operand has 132 states, 132 states have (on average 3.962121212121212) internal successors, (523), 132 states have internal predecessors, (523), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:23:57,586 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:23:57,586 INFO L93 Difference]: Finished difference Result 576 states and 623 transitions. [2021-11-20 23:23:57,587 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 177 states. [2021-11-20 23:23:57,587 INFO L78 Accepts]: Start accepts. Automaton has has 132 states, 132 states have (on average 3.962121212121212) internal successors, (523), 132 states have internal predecessors, (523), 0 states have call successors, (0), 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 262 [2021-11-20 23:23:57,587 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:23:57,588 INFO L225 Difference]: With dead ends: 576 [2021-11-20 23:23:57,588 INFO L226 Difference]: Without dead ends: 401 [2021-11-20 23:23:57,592 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1087 GetRequests, 775 SyntacticMatches, 1 SemanticMatches, 311 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 33778 ImplicationChecksByTransitivity, 8.2s TimeCoverageRelationStatistics Valid=14832, Invalid=82824, Unknown=0, NotChecked=0, Total=97656 [2021-11-20 23:23:57,592 INFO L933 BasicCegarLoop]: 46 mSDtfsCounter, 742 mSDsluCounter, 632 mSDsCounter, 0 mSdLazyCounter, 2786 mSolverCounterSat, 680 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 742 SdHoareTripleChecker+Valid, 677 SdHoareTripleChecker+Invalid, 3466 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 680 IncrementalHoareTripleChecker+Valid, 2786 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.2s IncrementalHoareTripleChecker+Time [2021-11-20 23:23:57,592 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [742 Valid, 677 Invalid, 3466 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [680 Valid, 2786 Invalid, 0 Unknown, 0 Unchecked, 1.2s Time] [2021-11-20 23:23:57,594 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 401 states. [2021-11-20 23:23:57,632 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 401 to 269. [2021-11-20 23:23:57,633 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 269 states, 268 states have (on average 1.0111940298507462) internal successors, (271), 268 states have internal predecessors, (271), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:23:57,634 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 269 states to 269 states and 271 transitions. [2021-11-20 23:23:57,634 INFO L78 Accepts]: Start accepts. Automaton has 269 states and 271 transitions. Word has length 262 [2021-11-20 23:23:57,634 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:23:57,634 INFO L470 AbstractCegarLoop]: Abstraction has 269 states and 271 transitions. [2021-11-20 23:23:57,634 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 132 states, 132 states have (on average 3.962121212121212) internal successors, (523), 132 states have internal predecessors, (523), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:23:57,635 INFO L276 IsEmpty]: Start isEmpty. Operand 269 states and 271 transitions. [2021-11-20 23:23:57,636 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 269 [2021-11-20 23:23:57,636 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:23:57,636 INFO L514 BasicCegarLoop]: trace histogram [44, 44, 43, 43, 43, 43, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:23:57,674 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (54)] Forceful destruction successful, exit code 0 [2021-11-20 23:23:57,850 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 54 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable55 [2021-11-20 23:23:57,851 INFO L402 AbstractCegarLoop]: === Iteration 57 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:23:57,851 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:23:57,851 INFO L85 PathProgramCache]: Analyzing trace with hash -1043592072, now seen corresponding path program 54 times [2021-11-20 23:23:57,851 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:23:57,851 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [520042865] [2021-11-20 23:23:57,851 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:23:57,851 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:23:57,924 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:23:59,992 INFO L134 CoverageAnalysis]: Checked inductivity of 5590 backedges. 3572 proven. 2018 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:23:59,992 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:23:59,992 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [520042865] [2021-11-20 23:23:59,992 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [520042865] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:23:59,992 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1712741179] [2021-11-20 23:23:59,992 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-20 23:23:59,992 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:23:59,992 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:23:59,993 INFO L229 MonitoredProcess]: Starting monitored process 55 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:23:59,994 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (55)] Waiting until timeout for monitored process [2021-11-20 23:24:00,119 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-20 23:24:00,120 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:24:00,125 INFO L263 TraceCheckSpWp]: Trace formula consists of 993 conjuncts, 90 conjunts are in the unsatisfiable core [2021-11-20 23:24:00,127 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:24:03,393 INFO L134 CoverageAnalysis]: Checked inductivity of 5590 backedges. 3698 proven. 1892 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:24:03,394 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:24:03,942 INFO L134 CoverageAnalysis]: Checked inductivity of 5590 backedges. 3698 proven. 1892 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:24:03,942 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1712741179] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:24:03,942 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1527305962] [2021-11-20 23:24:03,943 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-20 23:24:03,943 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:24:03,943 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:24:03,943 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:24:03,943 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:24:05,336 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:24:06,124 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:24:06,125 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:24:06,125 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [90, 90, 90] total 136 [2021-11-20 23:24:06,125 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1930150615] [2021-11-20 23:24:06,125 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:24:06,126 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 136 states [2021-11-20 23:24:06,126 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:24:06,127 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 136 interpolants. [2021-11-20 23:24:06,129 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=4259, Invalid=16621, Unknown=0, NotChecked=0, Total=20880 [2021-11-20 23:24:06,129 INFO L87 Difference]: Start difference. First operand 269 states and 271 transitions. Second operand has 136 states, 136 states have (on average 3.2941176470588234) internal successors, (448), 136 states have internal predecessors, (448), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:24:08,144 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:24:08,144 INFO L93 Difference]: Finished difference Result 582 states and 629 transitions. [2021-11-20 23:24:08,144 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 90 states. [2021-11-20 23:24:08,144 INFO L78 Accepts]: Start accepts. Automaton has has 136 states, 136 states have (on average 3.2941176470588234) internal successors, (448), 136 states have internal predecessors, (448), 0 states have call successors, (0), 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 268 [2021-11-20 23:24:08,145 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:24:08,146 INFO L225 Difference]: With dead ends: 582 [2021-11-20 23:24:08,146 INFO L226 Difference]: Without dead ends: 403 [2021-11-20 23:24:08,148 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 936 GetRequests, 749 SyntacticMatches, 0 SemanticMatches, 187 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8652 ImplicationChecksByTransitivity, 6.1s TimeCoverageRelationStatistics Valid=8221, Invalid=27311, Unknown=0, NotChecked=0, Total=35532 [2021-11-20 23:24:08,151 INFO L933 BasicCegarLoop]: 90 mSDtfsCounter, 367 mSDsluCounter, 970 mSDsCounter, 0 mSdLazyCounter, 1098 mSolverCounterSat, 300 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 367 SdHoareTripleChecker+Valid, 1060 SdHoareTripleChecker+Invalid, 1398 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 300 IncrementalHoareTripleChecker+Valid, 1098 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-20 23:24:08,151 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [367 Valid, 1060 Invalid, 1398 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [300 Valid, 1098 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2021-11-20 23:24:08,152 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 403 states. [2021-11-20 23:24:08,173 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 403 to 271. [2021-11-20 23:24:08,174 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 271 states, 270 states have (on average 1.011111111111111) internal successors, (273), 270 states have internal predecessors, (273), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:24:08,174 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 271 states to 271 states and 273 transitions. [2021-11-20 23:24:08,174 INFO L78 Accepts]: Start accepts. Automaton has 271 states and 273 transitions. Word has length 268 [2021-11-20 23:24:08,175 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:24:08,175 INFO L470 AbstractCegarLoop]: Abstraction has 271 states and 273 transitions. [2021-11-20 23:24:08,175 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 136 states, 136 states have (on average 3.2941176470588234) internal successors, (448), 136 states have internal predecessors, (448), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:24:08,175 INFO L276 IsEmpty]: Start isEmpty. Operand 271 states and 273 transitions. [2021-11-20 23:24:08,176 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 271 [2021-11-20 23:24:08,177 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:24:08,177 INFO L514 BasicCegarLoop]: trace histogram [45, 44, 44, 43, 43, 43, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:24:08,212 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (55)] Ended with exit code 0 [2021-11-20 23:24:08,402 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 55 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable56 [2021-11-20 23:24:08,403 INFO L402 AbstractCegarLoop]: === Iteration 58 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:24:08,403 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:24:08,403 INFO L85 PathProgramCache]: Analyzing trace with hash -751406499, now seen corresponding path program 55 times [2021-11-20 23:24:08,403 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:24:08,403 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [828524252] [2021-11-20 23:24:08,403 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:24:08,404 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:24:08,572 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:24:09,414 INFO L134 CoverageAnalysis]: Checked inductivity of 5678 backedges. 1892 proven. 3786 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:24:09,414 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:24:09,414 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [828524252] [2021-11-20 23:24:09,414 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [828524252] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:24:09,414 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [191501360] [2021-11-20 23:24:09,415 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-20 23:24:09,415 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:24:09,415 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:24:09,415 INFO L229 MonitoredProcess]: Starting monitored process 56 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:24:09,416 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (56)] Waiting until timeout for monitored process [2021-11-20 23:24:09,545 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:24:09,549 INFO L263 TraceCheckSpWp]: Trace formula consists of 1003 conjuncts, 91 conjunts are in the unsatisfiable core [2021-11-20 23:24:09,552 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:24:10,101 INFO L134 CoverageAnalysis]: Checked inductivity of 5678 backedges. 1980 proven. 3698 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:24:10,101 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:24:10,618 INFO L134 CoverageAnalysis]: Checked inductivity of 5678 backedges. 1980 proven. 3698 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:24:10,619 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [191501360] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:24:10,619 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1769059433] [2021-11-20 23:24:10,620 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-20 23:24:10,620 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:24:10,620 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:24:10,620 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:24:10,621 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:24:11,672 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:24:12,083 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:24:12,083 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:24:12,083 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [47, 47, 47] total 50 [2021-11-20 23:24:12,083 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [87442824] [2021-11-20 23:24:12,083 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:24:12,084 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 51 states [2021-11-20 23:24:12,084 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:24:12,084 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 51 interpolants. [2021-11-20 23:24:12,084 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1183, Invalid=2357, Unknown=0, NotChecked=0, Total=3540 [2021-11-20 23:24:12,085 INFO L87 Difference]: Start difference. First operand 271 states and 273 transitions. Second operand has 51 states, 51 states have (on average 5.705882352941177) internal successors, (291), 50 states have internal predecessors, (291), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:24:13,056 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:24:13,056 INFO L93 Difference]: Finished difference Result 288 states and 291 transitions. [2021-11-20 23:24:13,056 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 96 states. [2021-11-20 23:24:13,056 INFO L78 Accepts]: Start accepts. Automaton has has 51 states, 51 states have (on average 5.705882352941177) internal successors, (291), 50 states have internal predecessors, (291), 0 states have call successors, (0), 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 270 [2021-11-20 23:24:13,057 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:24:13,058 INFO L225 Difference]: With dead ends: 288 [2021-11-20 23:24:13,058 INFO L226 Difference]: Without dead ends: 286 [2021-11-20 23:24:13,059 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 945 GetRequests, 839 SyntacticMatches, 1 SemanticMatches, 105 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3144 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=3538, Invalid=7804, Unknown=0, NotChecked=0, Total=11342 [2021-11-20 23:24:13,059 INFO L933 BasicCegarLoop]: 53 mSDtfsCounter, 331 mSDsluCounter, 321 mSDsCounter, 0 mSdLazyCounter, 435 mSolverCounterSat, 230 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 331 SdHoareTripleChecker+Valid, 368 SdHoareTripleChecker+Invalid, 665 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 230 IncrementalHoareTripleChecker+Valid, 435 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-20 23:24:13,059 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [331 Valid, 368 Invalid, 665 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [230 Valid, 435 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-20 23:24:13,059 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 286 states. [2021-11-20 23:24:13,085 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 286 to 279. [2021-11-20 23:24:13,085 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 279 states, 278 states have (on average 1.0107913669064748) internal successors, (281), 278 states have internal predecessors, (281), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:24:13,086 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 279 states to 279 states and 281 transitions. [2021-11-20 23:24:13,086 INFO L78 Accepts]: Start accepts. Automaton has 279 states and 281 transitions. Word has length 270 [2021-11-20 23:24:13,086 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:24:13,086 INFO L470 AbstractCegarLoop]: Abstraction has 279 states and 281 transitions. [2021-11-20 23:24:13,086 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 51 states, 51 states have (on average 5.705882352941177) internal successors, (291), 50 states have internal predecessors, (291), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:24:13,087 INFO L276 IsEmpty]: Start isEmpty. Operand 279 states and 281 transitions. [2021-11-20 23:24:13,088 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 279 [2021-11-20 23:24:13,088 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:24:13,088 INFO L514 BasicCegarLoop]: trace histogram [46, 45, 45, 45, 45, 44, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:24:13,117 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (56)] Forceful destruction successful, exit code 0 [2021-11-20 23:24:13,306 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable57,56 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:24:13,307 INFO L402 AbstractCegarLoop]: === Iteration 59 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:24:13,307 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:24:13,307 INFO L85 PathProgramCache]: Analyzing trace with hash 1028462403, now seen corresponding path program 56 times [2021-11-20 23:24:13,307 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:24:13,307 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [254451310] [2021-11-20 23:24:13,307 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:24:13,307 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:24:13,399 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:24:15,605 INFO L134 CoverageAnalysis]: Checked inductivity of 6030 backedges. 3918 proven. 2112 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:24:15,605 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:24:15,605 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [254451310] [2021-11-20 23:24:15,605 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [254451310] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:24:15,605 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [994682666] [2021-11-20 23:24:15,605 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-20 23:24:15,605 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:24:15,605 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:24:15,606 INFO L229 MonitoredProcess]: Starting monitored process 57 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:24:15,607 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (57)] Waiting until timeout for monitored process [2021-11-20 23:24:15,841 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 46 check-sat command(s) [2021-11-20 23:24:15,842 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:24:15,847 INFO L263 TraceCheckSpWp]: Trace formula consists of 1027 conjuncts, 93 conjunts are in the unsatisfiable core [2021-11-20 23:24:15,849 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:24:19,413 INFO L134 CoverageAnalysis]: Checked inductivity of 6030 backedges. 4050 proven. 1980 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:24:19,413 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:24:20,055 INFO L134 CoverageAnalysis]: Checked inductivity of 6030 backedges. 4050 proven. 1980 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:24:20,055 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [994682666] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:24:20,055 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1544637100] [2021-11-20 23:24:20,056 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-20 23:24:20,056 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:24:20,056 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:24:20,056 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:24:20,056 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:24:21,389 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:24:22,184 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:24:22,184 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:24:22,184 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [93, 93, 93] total 143 [2021-11-20 23:24:22,184 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1223254830] [2021-11-20 23:24:22,184 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:24:22,185 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 143 states [2021-11-20 23:24:22,185 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:24:22,186 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 143 interpolants. [2021-11-20 23:24:22,186 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=4730, Invalid=18222, Unknown=0, NotChecked=0, Total=22952 [2021-11-20 23:24:22,187 INFO L87 Difference]: Start difference. First operand 279 states and 281 transitions. Second operand has 143 states, 143 states have (on average 3.3216783216783217) internal successors, (475), 143 states have internal predecessors, (475), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:24:25,672 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:24:25,672 INFO L93 Difference]: Finished difference Result 787 states and 837 transitions. [2021-11-20 23:24:25,672 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 139 states. [2021-11-20 23:24:25,672 INFO L78 Accepts]: Start accepts. Automaton has has 143 states, 143 states have (on average 3.3216783216783217) internal successors, (475), 143 states have internal predecessors, (475), 0 states have call successors, (0), 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 278 [2021-11-20 23:24:25,673 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:24:25,674 INFO L225 Difference]: With dead ends: 787 [2021-11-20 23:24:25,674 INFO L226 Difference]: Without dead ends: 421 [2021-11-20 23:24:25,678 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1016 GetRequests, 775 SyntacticMatches, 0 SemanticMatches, 241 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15084 ImplicationChecksByTransitivity, 7.6s TimeCoverageRelationStatistics Valid=13331, Invalid=45475, Unknown=0, NotChecked=0, Total=58806 [2021-11-20 23:24:25,678 INFO L933 BasicCegarLoop]: 92 mSDtfsCounter, 668 mSDsluCounter, 1256 mSDsCounter, 0 mSdLazyCounter, 1414 mSolverCounterSat, 481 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 668 SdHoareTripleChecker+Valid, 1348 SdHoareTripleChecker+Invalid, 1895 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 481 IncrementalHoareTripleChecker+Valid, 1414 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2021-11-20 23:24:25,678 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [668 Valid, 1348 Invalid, 1895 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [481 Valid, 1414 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2021-11-20 23:24:25,679 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 421 states. [2021-11-20 23:24:25,708 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 421 to 283. [2021-11-20 23:24:25,708 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 283 states, 282 states have (on average 1.0106382978723405) internal successors, (285), 282 states have internal predecessors, (285), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:24:25,708 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 283 states to 283 states and 285 transitions. [2021-11-20 23:24:25,708 INFO L78 Accepts]: Start accepts. Automaton has 283 states and 285 transitions. Word has length 278 [2021-11-20 23:24:25,709 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:24:25,709 INFO L470 AbstractCegarLoop]: Abstraction has 283 states and 285 transitions. [2021-11-20 23:24:25,709 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 143 states, 143 states have (on average 3.3216783216783217) internal successors, (475), 143 states have internal predecessors, (475), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:24:25,709 INFO L276 IsEmpty]: Start isEmpty. Operand 283 states and 285 transitions. [2021-11-20 23:24:25,710 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 283 [2021-11-20 23:24:25,710 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:24:25,711 INFO L514 BasicCegarLoop]: trace histogram [47, 46, 46, 45, 45, 45, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:24:25,742 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (57)] Forceful destruction successful, exit code 0 [2021-11-20 23:24:25,934 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 57 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable58 [2021-11-20 23:24:25,935 INFO L402 AbstractCegarLoop]: === Iteration 60 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:24:25,935 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:24:25,935 INFO L85 PathProgramCache]: Analyzing trace with hash -863970995, now seen corresponding path program 57 times [2021-11-20 23:24:25,935 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:24:25,935 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1185241696] [2021-11-20 23:24:25,935 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:24:25,935 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:24:26,053 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:24:26,952 INFO L134 CoverageAnalysis]: Checked inductivity of 6212 backedges. 2070 proven. 4142 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:24:26,952 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:24:26,952 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1185241696] [2021-11-20 23:24:26,952 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1185241696] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:24:26,952 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [271824602] [2021-11-20 23:24:26,952 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-20 23:24:26,952 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:24:26,953 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:24:26,953 INFO L229 MonitoredProcess]: Starting monitored process 58 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:24:26,954 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (58)] Waiting until timeout for monitored process [2021-11-20 23:24:27,091 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-20 23:24:27,091 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:24:27,097 INFO L263 TraceCheckSpWp]: Trace formula consists of 1047 conjuncts, 95 conjunts are in the unsatisfiable core [2021-11-20 23:24:27,099 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:24:27,616 INFO L134 CoverageAnalysis]: Checked inductivity of 6212 backedges. 2162 proven. 4050 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:24:27,616 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:24:28,153 INFO L134 CoverageAnalysis]: Checked inductivity of 6212 backedges. 2162 proven. 4050 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:24:28,154 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [271824602] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:24:28,154 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1527410366] [2021-11-20 23:24:28,155 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-20 23:24:28,155 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:24:28,155 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:24:28,155 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:24:28,155 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:24:29,262 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:24:29,674 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:24:29,674 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:24:29,675 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [49, 49, 49] total 52 [2021-11-20 23:24:29,675 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [851937794] [2021-11-20 23:24:29,675 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:24:29,675 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 53 states [2021-11-20 23:24:29,675 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:24:29,676 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2021-11-20 23:24:29,676 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1280, Invalid=2502, Unknown=0, NotChecked=0, Total=3782 [2021-11-20 23:24:29,677 INFO L87 Difference]: Start difference. First operand 283 states and 285 transitions. Second operand has 53 states, 53 states have (on average 5.716981132075472) internal successors, (303), 52 states have internal predecessors, (303), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:24:30,655 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:24:30,655 INFO L93 Difference]: Finished difference Result 300 states and 303 transitions. [2021-11-20 23:24:30,655 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 100 states. [2021-11-20 23:24:30,656 INFO L78 Accepts]: Start accepts. Automaton has has 53 states, 53 states have (on average 5.716981132075472) internal successors, (303), 52 states have internal predecessors, (303), 0 states have call successors, (0), 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 282 [2021-11-20 23:24:30,656 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:24:30,657 INFO L225 Difference]: With dead ends: 300 [2021-11-20 23:24:30,657 INFO L226 Difference]: Without dead ends: 298 [2021-11-20 23:24:30,658 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 987 GetRequests, 877 SyntacticMatches, 1 SemanticMatches, 109 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3376 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=3833, Invalid=8377, Unknown=0, NotChecked=0, Total=12210 [2021-11-20 23:24:30,658 INFO L933 BasicCegarLoop]: 55 mSDtfsCounter, 300 mSDsluCounter, 321 mSDsCounter, 0 mSdLazyCounter, 443 mSolverCounterSat, 194 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 300 SdHoareTripleChecker+Valid, 370 SdHoareTripleChecker+Invalid, 637 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 194 IncrementalHoareTripleChecker+Valid, 443 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-20 23:24:30,658 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [300 Valid, 370 Invalid, 637 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [194 Valid, 443 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-20 23:24:30,659 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 298 states. [2021-11-20 23:24:30,695 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 298 to 291. [2021-11-20 23:24:30,696 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 291 states, 290 states have (on average 1.0103448275862068) internal successors, (293), 290 states have internal predecessors, (293), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:24:30,696 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 291 states to 291 states and 293 transitions. [2021-11-20 23:24:30,696 INFO L78 Accepts]: Start accepts. Automaton has 291 states and 293 transitions. Word has length 282 [2021-11-20 23:24:30,697 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:24:30,697 INFO L470 AbstractCegarLoop]: Abstraction has 291 states and 293 transitions. [2021-11-20 23:24:30,697 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 53 states, 53 states have (on average 5.716981132075472) internal successors, (303), 52 states have internal predecessors, (303), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:24:30,697 INFO L276 IsEmpty]: Start isEmpty. Operand 291 states and 293 transitions. [2021-11-20 23:24:30,699 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 291 [2021-11-20 23:24:30,699 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:24:30,699 INFO L514 BasicCegarLoop]: trace histogram [48, 47, 47, 47, 47, 46, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:24:30,734 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (58)] Ended with exit code 0 [2021-11-20 23:24:30,914 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 58 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable59 [2021-11-20 23:24:30,915 INFO L402 AbstractCegarLoop]: === Iteration 61 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:24:30,915 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:24:30,915 INFO L85 PathProgramCache]: Analyzing trace with hash -1862693325, now seen corresponding path program 58 times [2021-11-20 23:24:30,915 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:24:30,915 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1166020976] [2021-11-20 23:24:30,915 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:24:30,915 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:24:30,990 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:24:33,381 INFO L134 CoverageAnalysis]: Checked inductivity of 6580 backedges. 4280 proven. 2300 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:24:33,381 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:24:33,381 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1166020976] [2021-11-20 23:24:33,381 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1166020976] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:24:33,381 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1663141322] [2021-11-20 23:24:33,381 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-20 23:24:33,381 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:24:33,381 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:24:33,382 INFO L229 MonitoredProcess]: Starting monitored process 59 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:24:33,383 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (59)] Waiting until timeout for monitored process [2021-11-20 23:24:33,514 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:24:33,519 INFO L263 TraceCheckSpWp]: Trace formula consists of 1071 conjuncts, 96 conjunts are in the unsatisfiable core [2021-11-20 23:24:33,521 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:24:37,170 INFO L134 CoverageAnalysis]: Checked inductivity of 6580 backedges. 4416 proven. 2162 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-20 23:24:37,170 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:24:37,705 INFO L134 CoverageAnalysis]: Checked inductivity of 6580 backedges. 4416 proven. 2162 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-20 23:24:37,705 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1663141322] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:24:37,706 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1434249860] [2021-11-20 23:24:37,706 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-20 23:24:37,706 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:24:37,706 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:24:37,707 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:24:37,707 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:24:39,107 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:24:39,915 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:24:39,915 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:24:39,915 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [97, 96, 96] total 146 [2021-11-20 23:24:39,915 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [639915147] [2021-11-20 23:24:39,915 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:24:39,916 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 146 states [2021-11-20 23:24:39,916 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:24:39,917 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 146 interpolants. [2021-11-20 23:24:39,918 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=4878, Invalid=18992, Unknown=0, NotChecked=0, Total=23870 [2021-11-20 23:24:39,918 INFO L87 Difference]: Start difference. First operand 291 states and 293 transitions. Second operand has 146 states, 146 states have (on average 3.328767123287671) internal successors, (486), 146 states have internal predecessors, (486), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:24:42,105 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:24:42,106 INFO L93 Difference]: Finished difference Result 627 states and 677 transitions. [2021-11-20 23:24:42,106 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 96 states. [2021-11-20 23:24:42,106 INFO L78 Accepts]: Start accepts. Automaton has has 146 states, 146 states have (on average 3.328767123287671) internal successors, (486), 146 states have internal predecessors, (486), 0 states have call successors, (0), 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 290 [2021-11-20 23:24:42,106 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:24:42,108 INFO L225 Difference]: With dead ends: 627 [2021-11-20 23:24:42,108 INFO L226 Difference]: Without dead ends: 434 [2021-11-20 23:24:42,110 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1012 GetRequests, 812 SyntacticMatches, 0 SemanticMatches, 200 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9885 ImplicationChecksByTransitivity, 6.9s TimeCoverageRelationStatistics Valid=9392, Invalid=31210, Unknown=0, NotChecked=0, Total=40602 [2021-11-20 23:24:42,111 INFO L933 BasicCegarLoop]: 96 mSDtfsCounter, 422 mSDsluCounter, 1090 mSDsCounter, 0 mSdLazyCounter, 1236 mSolverCounterSat, 384 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 422 SdHoareTripleChecker+Valid, 1186 SdHoareTripleChecker+Invalid, 1620 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 384 IncrementalHoareTripleChecker+Valid, 1236 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-20 23:24:42,111 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [422 Valid, 1186 Invalid, 1620 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [384 Valid, 1236 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2021-11-20 23:24:42,111 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 434 states. [2021-11-20 23:24:42,152 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 434 to 293. [2021-11-20 23:24:42,153 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 293 states, 292 states have (on average 1.0102739726027397) internal successors, (295), 292 states have internal predecessors, (295), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:24:42,153 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 293 states to 293 states and 295 transitions. [2021-11-20 23:24:42,153 INFO L78 Accepts]: Start accepts. Automaton has 293 states and 295 transitions. Word has length 290 [2021-11-20 23:24:42,153 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:24:42,153 INFO L470 AbstractCegarLoop]: Abstraction has 293 states and 295 transitions. [2021-11-20 23:24:42,153 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 146 states, 146 states have (on average 3.328767123287671) internal successors, (486), 146 states have internal predecessors, (486), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:24:42,154 INFO L276 IsEmpty]: Start isEmpty. Operand 293 states and 295 transitions. [2021-11-20 23:24:42,154 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 293 [2021-11-20 23:24:42,154 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:24:42,155 INFO L514 BasicCegarLoop]: trace histogram [48, 48, 47, 47, 47, 47, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:24:42,176 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (59)] Forceful destruction successful, exit code 0 [2021-11-20 23:24:42,355 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable60,59 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:24:42,355 INFO L402 AbstractCegarLoop]: === Iteration 62 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:24:42,355 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:24:42,356 INFO L85 PathProgramCache]: Analyzing trace with hash 1186482776, now seen corresponding path program 59 times [2021-11-20 23:24:42,356 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:24:42,356 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [566311003] [2021-11-20 23:24:42,356 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:24:42,356 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:24:42,437 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:24:44,879 INFO L134 CoverageAnalysis]: Checked inductivity of 6674 backedges. 4280 proven. 2394 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:24:44,879 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:24:44,880 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [566311003] [2021-11-20 23:24:44,880 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [566311003] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:24:44,880 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [693801590] [2021-11-20 23:24:44,880 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-20 23:24:44,880 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:24:44,880 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:24:44,881 INFO L229 MonitoredProcess]: Starting monitored process 60 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:24:44,881 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (60)] Waiting until timeout for monitored process [2021-11-20 23:24:45,122 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 48 check-sat command(s) [2021-11-20 23:24:45,122 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:24:45,128 INFO L263 TraceCheckSpWp]: Trace formula consists of 1081 conjuncts, 98 conjunts are in the unsatisfiable core [2021-11-20 23:24:45,130 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:24:48,874 INFO L134 CoverageAnalysis]: Checked inductivity of 6674 backedges. 4418 proven. 2256 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:24:48,875 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:24:49,418 INFO L134 CoverageAnalysis]: Checked inductivity of 6674 backedges. 4418 proven. 2256 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:24:49,418 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [693801590] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:24:49,418 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [692868755] [2021-11-20 23:24:49,419 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-20 23:24:49,419 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:24:49,419 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:24:49,419 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:24:49,419 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:24:50,645 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:24:51,472 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:24:51,472 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:24:51,472 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [98, 98, 98] total 148 [2021-11-20 23:24:51,472 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1036670988] [2021-11-20 23:24:51,472 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:24:51,473 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 148 states [2021-11-20 23:24:51,473 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:24:51,474 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 148 interpolants. [2021-11-20 23:24:51,475 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5027, Invalid=19465, Unknown=0, NotChecked=0, Total=24492 [2021-11-20 23:24:51,475 INFO L87 Difference]: Start difference. First operand 293 states and 295 transitions. Second operand has 148 states, 148 states have (on average 3.2972972972972974) internal successors, (488), 148 states have internal predecessors, (488), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:24:53,726 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:24:53,727 INFO L93 Difference]: Finished difference Result 634 states and 685 transitions. [2021-11-20 23:24:53,727 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 98 states. [2021-11-20 23:24:53,727 INFO L78 Accepts]: Start accepts. Automaton has has 148 states, 148 states have (on average 3.2972972972972974) internal successors, (488), 148 states have internal predecessors, (488), 0 states have call successors, (0), 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 292 [2021-11-20 23:24:53,727 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:24:53,729 INFO L225 Difference]: With dead ends: 634 [2021-11-20 23:24:53,729 INFO L226 Difference]: Without dead ends: 439 [2021-11-20 23:24:53,732 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1020 GetRequests, 817 SyntacticMatches, 0 SemanticMatches, 203 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10110 ImplicationChecksByTransitivity, 7.0s TimeCoverageRelationStatistics Valid=9733, Invalid=32087, Unknown=0, NotChecked=0, Total=41820 [2021-11-20 23:24:53,732 INFO L933 BasicCegarLoop]: 98 mSDtfsCounter, 537 mSDsluCounter, 998 mSDsCounter, 0 mSdLazyCounter, 1151 mSolverCounterSat, 395 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 537 SdHoareTripleChecker+Valid, 1096 SdHoareTripleChecker+Invalid, 1546 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 395 IncrementalHoareTripleChecker+Valid, 1151 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-20 23:24:53,732 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [537 Valid, 1096 Invalid, 1546 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [395 Valid, 1151 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2021-11-20 23:24:53,733 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 439 states. [2021-11-20 23:24:53,772 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 439 to 295. [2021-11-20 23:24:53,772 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 295 states, 294 states have (on average 1.010204081632653) internal successors, (297), 294 states have internal predecessors, (297), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:24:53,773 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 295 states to 295 states and 297 transitions. [2021-11-20 23:24:53,773 INFO L78 Accepts]: Start accepts. Automaton has 295 states and 297 transitions. Word has length 292 [2021-11-20 23:24:53,773 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:24:53,774 INFO L470 AbstractCegarLoop]: Abstraction has 295 states and 297 transitions. [2021-11-20 23:24:53,774 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 148 states, 148 states have (on average 3.2972972972972974) internal successors, (488), 148 states have internal predecessors, (488), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:24:53,774 INFO L276 IsEmpty]: Start isEmpty. Operand 295 states and 297 transitions. [2021-11-20 23:24:53,775 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 295 [2021-11-20 23:24:53,776 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:24:53,776 INFO L514 BasicCegarLoop]: trace histogram [49, 48, 48, 47, 47, 47, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:24:53,814 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (60)] Forceful destruction successful, exit code 0 [2021-11-20 23:24:54,002 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable61,60 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:24:54,003 INFO L402 AbstractCegarLoop]: === Iteration 63 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:24:54,003 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:24:54,003 INFO L85 PathProgramCache]: Analyzing trace with hash -2017947331, now seen corresponding path program 60 times [2021-11-20 23:24:54,003 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:24:54,003 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [47729216] [2021-11-20 23:24:54,003 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:24:54,003 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:24:54,085 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:24:55,046 INFO L134 CoverageAnalysis]: Checked inductivity of 6770 backedges. 2256 proven. 4514 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:24:55,046 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:24:55,046 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [47729216] [2021-11-20 23:24:55,046 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [47729216] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:24:55,046 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [373348727] [2021-11-20 23:24:55,046 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-20 23:24:55,047 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:24:55,047 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:24:55,048 INFO L229 MonitoredProcess]: Starting monitored process 61 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:24:55,049 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (61)] Waiting until timeout for monitored process [2021-11-20 23:24:55,185 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-20 23:24:55,185 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:24:55,191 INFO L263 TraceCheckSpWp]: Trace formula consists of 1091 conjuncts, 99 conjunts are in the unsatisfiable core [2021-11-20 23:24:55,193 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:24:55,750 INFO L134 CoverageAnalysis]: Checked inductivity of 6770 backedges. 2352 proven. 4418 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:24:55,750 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:24:56,306 INFO L134 CoverageAnalysis]: Checked inductivity of 6770 backedges. 2352 proven. 4418 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:24:56,306 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [373348727] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:24:56,306 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1130537209] [2021-11-20 23:24:56,307 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-20 23:24:56,307 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:24:56,307 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:24:56,307 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:24:56,307 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:24:57,415 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:24:57,848 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:24:57,849 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:24:57,849 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [51, 51, 51] total 54 [2021-11-20 23:24:57,849 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1685765981] [2021-11-20 23:24:57,849 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:24:57,850 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 55 states [2021-11-20 23:24:57,850 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:24:57,850 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 55 interpolants. [2021-11-20 23:24:57,850 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1381, Invalid=2651, Unknown=0, NotChecked=0, Total=4032 [2021-11-20 23:24:57,851 INFO L87 Difference]: Start difference. First operand 295 states and 297 transitions. Second operand has 55 states, 55 states have (on average 5.7272727272727275) internal successors, (315), 54 states have internal predecessors, (315), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:24:58,907 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:24:58,907 INFO L93 Difference]: Finished difference Result 312 states and 315 transitions. [2021-11-20 23:24:58,907 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 104 states. [2021-11-20 23:24:58,907 INFO L78 Accepts]: Start accepts. Automaton has has 55 states, 55 states have (on average 5.7272727272727275) internal successors, (315), 54 states have internal predecessors, (315), 0 states have call successors, (0), 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 294 [2021-11-20 23:24:58,907 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:24:58,908 INFO L225 Difference]: With dead ends: 312 [2021-11-20 23:24:58,909 INFO L226 Difference]: Without dead ends: 310 [2021-11-20 23:24:58,909 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1029 GetRequests, 915 SyntacticMatches, 1 SemanticMatches, 113 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3616 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=4140, Invalid=8970, Unknown=0, NotChecked=0, Total=13110 [2021-11-20 23:24:58,910 INFO L933 BasicCegarLoop]: 57 mSDtfsCounter, 212 mSDsluCounter, 404 mSDsCounter, 0 mSdLazyCounter, 521 mSolverCounterSat, 153 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 212 SdHoareTripleChecker+Valid, 452 SdHoareTripleChecker+Invalid, 674 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 153 IncrementalHoareTripleChecker+Valid, 521 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-20 23:24:58,910 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [212 Valid, 452 Invalid, 674 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [153 Valid, 521 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-20 23:24:58,910 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 310 states. [2021-11-20 23:24:58,935 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 310 to 303. [2021-11-20 23:24:58,935 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 303 states, 302 states have (on average 1.009933774834437) internal successors, (305), 302 states have internal predecessors, (305), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:24:58,935 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 303 states to 303 states and 305 transitions. [2021-11-20 23:24:58,935 INFO L78 Accepts]: Start accepts. Automaton has 303 states and 305 transitions. Word has length 294 [2021-11-20 23:24:58,936 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:24:58,936 INFO L470 AbstractCegarLoop]: Abstraction has 303 states and 305 transitions. [2021-11-20 23:24:58,936 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 55 states, 55 states have (on average 5.7272727272727275) internal successors, (315), 54 states have internal predecessors, (315), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:24:58,936 INFO L276 IsEmpty]: Start isEmpty. Operand 303 states and 305 transitions. [2021-11-20 23:24:58,937 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 303 [2021-11-20 23:24:58,937 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:24:58,937 INFO L514 BasicCegarLoop]: trace histogram [50, 49, 49, 49, 49, 48, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:24:58,959 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (61)] Forceful destruction successful, exit code 0 [2021-11-20 23:24:59,138 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable62,61 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:24:59,139 INFO L402 AbstractCegarLoop]: === Iteration 64 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:24:59,139 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:24:59,139 INFO L85 PathProgramCache]: Analyzing trace with hash 280122915, now seen corresponding path program 61 times [2021-11-20 23:24:59,139 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:24:59,139 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [790027001] [2021-11-20 23:24:59,139 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:24:59,139 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:24:59,222 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:25:01,814 INFO L134 CoverageAnalysis]: Checked inductivity of 7154 backedges. 4658 proven. 2496 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:25:01,814 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:25:01,815 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [790027001] [2021-11-20 23:25:01,815 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [790027001] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:25:01,815 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [964048873] [2021-11-20 23:25:01,815 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-20 23:25:01,815 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:25:01,815 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:25:01,816 INFO L229 MonitoredProcess]: Starting monitored process 62 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:25:01,816 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (62)] Waiting until timeout for monitored process [2021-11-20 23:25:01,954 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:25:01,959 INFO L263 TraceCheckSpWp]: Trace formula consists of 1115 conjuncts, 100 conjunts are in the unsatisfiable core [2021-11-20 23:25:01,976 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:25:05,888 INFO L134 CoverageAnalysis]: Checked inductivity of 7154 backedges. 4800 proven. 2352 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-20 23:25:05,889 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:25:06,476 INFO L134 CoverageAnalysis]: Checked inductivity of 7154 backedges. 4800 proven. 2352 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-20 23:25:06,477 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [964048873] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:25:06,477 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1709734729] [2021-11-20 23:25:06,477 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-20 23:25:06,477 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:25:06,478 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:25:06,478 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:25:06,478 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:25:07,853 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:25:08,680 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:25:08,680 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:25:08,680 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [101, 100, 100] total 152 [2021-11-20 23:25:08,680 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2037865411] [2021-11-20 23:25:08,680 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:25:08,681 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 152 states [2021-11-20 23:25:08,681 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:25:08,682 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 152 interpolants. [2021-11-20 23:25:08,684 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5280, Invalid=20480, Unknown=0, NotChecked=0, Total=25760 [2021-11-20 23:25:08,684 INFO L87 Difference]: Start difference. First operand 303 states and 305 transitions. Second operand has 152 states, 152 states have (on average 3.3289473684210527) internal successors, (506), 152 states have internal predecessors, (506), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:25:11,095 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:25:11,096 INFO L93 Difference]: Finished difference Result 653 states and 705 transitions. [2021-11-20 23:25:11,096 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 100 states. [2021-11-20 23:25:11,096 INFO L78 Accepts]: Start accepts. Automaton has has 152 states, 152 states have (on average 3.3289473684210527) internal successors, (506), 152 states have internal predecessors, (506), 0 states have call successors, (0), 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 302 [2021-11-20 23:25:11,096 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:25:11,098 INFO L225 Difference]: With dead ends: 653 [2021-11-20 23:25:11,098 INFO L226 Difference]: Without dead ends: 452 [2021-11-20 23:25:11,100 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1054 GetRequests, 846 SyntacticMatches, 0 SemanticMatches, 208 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10648 ImplicationChecksByTransitivity, 7.4s TimeCoverageRelationStatistics Valid=10182, Invalid=33708, Unknown=0, NotChecked=0, Total=43890 [2021-11-20 23:25:11,101 INFO L933 BasicCegarLoop]: 100 mSDtfsCounter, 525 mSDsluCounter, 1135 mSDsCounter, 0 mSdLazyCounter, 1285 mSolverCounterSat, 393 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 525 SdHoareTripleChecker+Valid, 1235 SdHoareTripleChecker+Invalid, 1678 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 393 IncrementalHoareTripleChecker+Valid, 1285 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-20 23:25:11,101 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [525 Valid, 1235 Invalid, 1678 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [393 Valid, 1285 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2021-11-20 23:25:11,102 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 452 states. [2021-11-20 23:25:11,164 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 452 to 305. [2021-11-20 23:25:11,164 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 305 states, 304 states have (on average 1.0098684210526316) internal successors, (307), 304 states have internal predecessors, (307), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:25:11,165 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 305 states to 305 states and 307 transitions. [2021-11-20 23:25:11,165 INFO L78 Accepts]: Start accepts. Automaton has 305 states and 307 transitions. Word has length 302 [2021-11-20 23:25:11,165 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:25:11,165 INFO L470 AbstractCegarLoop]: Abstraction has 305 states and 307 transitions. [2021-11-20 23:25:11,165 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 152 states, 152 states have (on average 3.3289473684210527) internal successors, (506), 152 states have internal predecessors, (506), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:25:11,166 INFO L276 IsEmpty]: Start isEmpty. Operand 305 states and 307 transitions. [2021-11-20 23:25:11,167 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 305 [2021-11-20 23:25:11,167 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:25:11,167 INFO L514 BasicCegarLoop]: trace histogram [50, 50, 49, 49, 49, 49, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:25:11,188 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (62)] Forceful destruction successful, exit code 0 [2021-11-20 23:25:11,367 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 62 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable63 [2021-11-20 23:25:11,367 INFO L402 AbstractCegarLoop]: === Iteration 65 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:25:11,368 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:25:11,368 INFO L85 PathProgramCache]: Analyzing trace with hash -886635832, now seen corresponding path program 62 times [2021-11-20 23:25:11,368 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:25:11,368 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [959227133] [2021-11-20 23:25:11,368 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:25:11,368 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:25:11,484 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:25:14,101 INFO L134 CoverageAnalysis]: Checked inductivity of 7252 backedges. 4658 proven. 2594 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:25:14,101 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:25:14,101 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [959227133] [2021-11-20 23:25:14,101 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [959227133] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:25:14,101 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [244070423] [2021-11-20 23:25:14,102 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-20 23:25:14,102 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:25:14,102 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:25:14,103 INFO L229 MonitoredProcess]: Starting monitored process 63 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:25:14,104 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (63)] Waiting until timeout for monitored process [2021-11-20 23:25:14,361 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 50 check-sat command(s) [2021-11-20 23:25:14,361 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:25:14,367 INFO L263 TraceCheckSpWp]: Trace formula consists of 1125 conjuncts, 102 conjunts are in the unsatisfiable core [2021-11-20 23:25:14,369 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:25:18,493 INFO L134 CoverageAnalysis]: Checked inductivity of 7252 backedges. 4802 proven. 2450 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:25:18,493 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:25:19,102 INFO L134 CoverageAnalysis]: Checked inductivity of 7252 backedges. 4802 proven. 2450 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:25:19,103 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [244070423] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:25:19,103 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [337462244] [2021-11-20 23:25:19,104 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-20 23:25:19,104 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:25:19,104 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:25:19,104 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:25:19,104 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:25:20,475 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:25:21,353 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:25:21,354 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:25:21,354 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [102, 102, 102] total 154 [2021-11-20 23:25:21,354 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [637239580] [2021-11-20 23:25:21,354 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:25:21,355 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 154 states [2021-11-20 23:25:21,355 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:25:21,356 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 154 interpolants. [2021-11-20 23:25:21,357 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5435, Invalid=20971, Unknown=0, NotChecked=0, Total=26406 [2021-11-20 23:25:21,357 INFO L87 Difference]: Start difference. First operand 305 states and 307 transitions. Second operand has 154 states, 154 states have (on average 3.2987012987012987) internal successors, (508), 154 states have internal predecessors, (508), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:25:24,128 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:25:24,128 INFO L93 Difference]: Finished difference Result 660 states and 713 transitions. [2021-11-20 23:25:24,128 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 102 states. [2021-11-20 23:25:24,129 INFO L78 Accepts]: Start accepts. Automaton has has 154 states, 154 states have (on average 3.2987012987012987) internal successors, (508), 154 states have internal predecessors, (508), 0 states have call successors, (0), 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 304 [2021-11-20 23:25:24,129 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:25:24,130 INFO L225 Difference]: With dead ends: 660 [2021-11-20 23:25:24,131 INFO L226 Difference]: Without dead ends: 457 [2021-11-20 23:25:24,133 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1062 GetRequests, 851 SyntacticMatches, 0 SemanticMatches, 211 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10881 ImplicationChecksByTransitivity, 7.8s TimeCoverageRelationStatistics Valid=10537, Invalid=34619, Unknown=0, NotChecked=0, Total=45156 [2021-11-20 23:25:24,134 INFO L933 BasicCegarLoop]: 102 mSDtfsCounter, 523 mSDsluCounter, 1125 mSDsCounter, 0 mSdLazyCounter, 1292 mSolverCounterSat, 546 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 523 SdHoareTripleChecker+Valid, 1227 SdHoareTripleChecker+Invalid, 1838 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 546 IncrementalHoareTripleChecker+Valid, 1292 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2021-11-20 23:25:24,134 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [523 Valid, 1227 Invalid, 1838 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [546 Valid, 1292 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2021-11-20 23:25:24,135 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 457 states. [2021-11-20 23:25:24,171 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 457 to 307. [2021-11-20 23:25:24,171 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 307 states, 306 states have (on average 1.0098039215686274) internal successors, (309), 306 states have internal predecessors, (309), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:25:24,171 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 307 states to 307 states and 309 transitions. [2021-11-20 23:25:24,171 INFO L78 Accepts]: Start accepts. Automaton has 307 states and 309 transitions. Word has length 304 [2021-11-20 23:25:24,172 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:25:24,172 INFO L470 AbstractCegarLoop]: Abstraction has 307 states and 309 transitions. [2021-11-20 23:25:24,172 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 154 states, 154 states have (on average 3.2987012987012987) internal successors, (508), 154 states have internal predecessors, (508), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:25:24,172 INFO L276 IsEmpty]: Start isEmpty. Operand 307 states and 309 transitions. [2021-11-20 23:25:24,173 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 307 [2021-11-20 23:25:24,173 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:25:24,173 INFO L514 BasicCegarLoop]: trace histogram [51, 50, 50, 49, 49, 49, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:25:24,196 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (63)] Forceful destruction successful, exit code 0 [2021-11-20 23:25:24,373 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable64,63 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:25:24,374 INFO L402 AbstractCegarLoop]: === Iteration 66 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:25:24,374 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:25:24,374 INFO L85 PathProgramCache]: Analyzing trace with hash -1155327443, now seen corresponding path program 63 times [2021-11-20 23:25:24,374 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:25:24,375 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [717020709] [2021-11-20 23:25:24,375 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:25:24,391 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:25:24,531 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:25:25,587 INFO L134 CoverageAnalysis]: Checked inductivity of 7352 backedges. 2450 proven. 4902 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:25:25,587 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:25:25,587 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [717020709] [2021-11-20 23:25:25,587 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [717020709] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:25:25,588 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [288555993] [2021-11-20 23:25:25,588 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-20 23:25:25,588 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:25:25,588 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:25:25,590 INFO L229 MonitoredProcess]: Starting monitored process 64 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:25:25,591 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (64)] Waiting until timeout for monitored process [2021-11-20 23:25:25,752 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-20 23:25:25,752 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:25:25,759 INFO L263 TraceCheckSpWp]: Trace formula consists of 1135 conjuncts, 103 conjunts are in the unsatisfiable core [2021-11-20 23:25:25,762 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:25:26,376 INFO L134 CoverageAnalysis]: Checked inductivity of 7352 backedges. 2550 proven. 4802 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:25:26,376 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:25:27,060 INFO L134 CoverageAnalysis]: Checked inductivity of 7352 backedges. 2550 proven. 4802 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:25:27,061 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [288555993] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:25:27,061 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [671565711] [2021-11-20 23:25:27,062 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-20 23:25:27,062 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:25:27,062 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:25:27,062 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:25:27,063 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:25:28,175 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:25:28,619 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:25:28,620 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:25:28,620 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [53, 53, 53] total 56 [2021-11-20 23:25:28,620 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [857649118] [2021-11-20 23:25:28,620 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:25:28,621 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 57 states [2021-11-20 23:25:28,621 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:25:28,621 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 57 interpolants. [2021-11-20 23:25:28,621 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1486, Invalid=2804, Unknown=0, NotChecked=0, Total=4290 [2021-11-20 23:25:28,621 INFO L87 Difference]: Start difference. First operand 307 states and 309 transitions. Second operand has 57 states, 57 states have (on average 5.7368421052631575) internal successors, (327), 56 states have internal predecessors, (327), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:25:29,737 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:25:29,738 INFO L93 Difference]: Finished difference Result 324 states and 327 transitions. [2021-11-20 23:25:29,738 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 108 states. [2021-11-20 23:25:29,738 INFO L78 Accepts]: Start accepts. Automaton has has 57 states, 57 states have (on average 5.7368421052631575) internal successors, (327), 56 states have internal predecessors, (327), 0 states have call successors, (0), 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 306 [2021-11-20 23:25:29,738 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:25:29,739 INFO L225 Difference]: With dead ends: 324 [2021-11-20 23:25:29,739 INFO L226 Difference]: Without dead ends: 322 [2021-11-20 23:25:29,741 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1071 GetRequests, 953 SyntacticMatches, 1 SemanticMatches, 117 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3864 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=4459, Invalid=9583, Unknown=0, NotChecked=0, Total=14042 [2021-11-20 23:25:29,741 INFO L933 BasicCegarLoop]: 59 mSDtfsCounter, 219 mSDsluCounter, 398 mSDsCounter, 0 mSdLazyCounter, 528 mSolverCounterSat, 159 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 219 SdHoareTripleChecker+Valid, 449 SdHoareTripleChecker+Invalid, 687 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 159 IncrementalHoareTripleChecker+Valid, 528 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-20 23:25:29,741 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [219 Valid, 449 Invalid, 687 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [159 Valid, 528 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-20 23:25:29,742 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 322 states. [2021-11-20 23:25:29,769 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 322 to 315. [2021-11-20 23:25:29,769 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 315 states, 314 states have (on average 1.0095541401273886) internal successors, (317), 314 states have internal predecessors, (317), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:25:29,769 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 315 states to 315 states and 317 transitions. [2021-11-20 23:25:29,769 INFO L78 Accepts]: Start accepts. Automaton has 315 states and 317 transitions. Word has length 306 [2021-11-20 23:25:29,770 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:25:29,770 INFO L470 AbstractCegarLoop]: Abstraction has 315 states and 317 transitions. [2021-11-20 23:25:29,770 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 57 states, 57 states have (on average 5.7368421052631575) internal successors, (327), 56 states have internal predecessors, (327), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:25:29,770 INFO L276 IsEmpty]: Start isEmpty. Operand 315 states and 317 transitions. [2021-11-20 23:25:29,771 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 315 [2021-11-20 23:25:29,771 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:25:29,772 INFO L514 BasicCegarLoop]: trace histogram [52, 51, 51, 51, 51, 50, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:25:29,797 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (64)] Forceful destruction successful, exit code 0 [2021-11-20 23:25:29,974 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 64 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable65 [2021-11-20 23:25:29,975 INFO L402 AbstractCegarLoop]: === Iteration 67 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:25:29,975 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:25:29,975 INFO L85 PathProgramCache]: Analyzing trace with hash -1791168749, now seen corresponding path program 64 times [2021-11-20 23:25:29,975 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:25:29,975 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [314867630] [2021-11-20 23:25:29,975 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:25:29,975 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:25:30,071 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:25:32,930 INFO L134 CoverageAnalysis]: Checked inductivity of 7752 backedges. 5052 proven. 2700 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:25:32,930 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:25:32,931 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [314867630] [2021-11-20 23:25:32,931 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [314867630] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:25:32,931 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1634969690] [2021-11-20 23:25:32,931 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-20 23:25:32,931 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:25:32,931 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:25:32,932 INFO L229 MonitoredProcess]: Starting monitored process 65 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:25:32,933 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (65)] Waiting until timeout for monitored process [2021-11-20 23:25:33,073 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:25:33,079 INFO L263 TraceCheckSpWp]: Trace formula consists of 1159 conjuncts, 104 conjunts are in the unsatisfiable core [2021-11-20 23:25:33,082 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:25:37,387 INFO L134 CoverageAnalysis]: Checked inductivity of 7752 backedges. 5200 proven. 2550 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-20 23:25:37,387 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:25:37,984 INFO L134 CoverageAnalysis]: Checked inductivity of 7752 backedges. 5200 proven. 2550 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-20 23:25:37,984 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1634969690] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:25:37,984 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1625211572] [2021-11-20 23:25:37,985 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-20 23:25:37,985 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:25:37,986 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:25:37,986 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:25:37,986 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:25:39,479 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:25:40,377 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:25:40,377 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:25:40,377 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [105, 104, 104] total 158 [2021-11-20 23:25:40,377 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1632054976] [2021-11-20 23:25:40,377 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:25:40,378 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 158 states [2021-11-20 23:25:40,378 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:25:40,379 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 158 interpolants. [2021-11-20 23:25:40,380 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5698, Invalid=22024, Unknown=0, NotChecked=0, Total=27722 [2021-11-20 23:25:40,380 INFO L87 Difference]: Start difference. First operand 315 states and 317 transitions. Second operand has 158 states, 158 states have (on average 3.329113924050633) internal successors, (526), 158 states have internal predecessors, (526), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:25:43,161 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:25:43,161 INFO L93 Difference]: Finished difference Result 679 states and 733 transitions. [2021-11-20 23:25:43,162 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 104 states. [2021-11-20 23:25:43,162 INFO L78 Accepts]: Start accepts. Automaton has has 158 states, 158 states have (on average 3.329113924050633) internal successors, (526), 158 states have internal predecessors, (526), 0 states have call successors, (0), 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 314 [2021-11-20 23:25:43,162 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:25:43,164 INFO L225 Difference]: With dead ends: 679 [2021-11-20 23:25:43,164 INFO L226 Difference]: Without dead ends: 470 [2021-11-20 23:25:43,168 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1096 GetRequests, 880 SyntacticMatches, 0 SemanticMatches, 216 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11439 ImplicationChecksByTransitivity, 8.2s TimeCoverageRelationStatistics Valid=11004, Invalid=36302, Unknown=0, NotChecked=0, Total=47306 [2021-11-20 23:25:43,168 INFO L933 BasicCegarLoop]: 104 mSDtfsCounter, 532 mSDsluCounter, 1169 mSDsCounter, 0 mSdLazyCounter, 1337 mSolverCounterSat, 348 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 532 SdHoareTripleChecker+Valid, 1273 SdHoareTripleChecker+Invalid, 1685 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 348 IncrementalHoareTripleChecker+Valid, 1337 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2021-11-20 23:25:43,169 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [532 Valid, 1273 Invalid, 1685 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [348 Valid, 1337 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2021-11-20 23:25:43,169 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 470 states. [2021-11-20 23:25:43,202 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 470 to 317. [2021-11-20 23:25:43,203 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 317 states, 316 states have (on average 1.009493670886076) internal successors, (319), 316 states have internal predecessors, (319), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:25:43,203 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 317 states to 317 states and 319 transitions. [2021-11-20 23:25:43,203 INFO L78 Accepts]: Start accepts. Automaton has 317 states and 319 transitions. Word has length 314 [2021-11-20 23:25:43,203 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:25:43,203 INFO L470 AbstractCegarLoop]: Abstraction has 317 states and 319 transitions. [2021-11-20 23:25:43,203 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 158 states, 158 states have (on average 3.329113924050633) internal successors, (526), 158 states have internal predecessors, (526), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:25:43,204 INFO L276 IsEmpty]: Start isEmpty. Operand 317 states and 319 transitions. [2021-11-20 23:25:43,205 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 317 [2021-11-20 23:25:43,205 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:25:43,205 INFO L514 BasicCegarLoop]: trace histogram [52, 52, 51, 51, 51, 51, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:25:43,226 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (65)] Forceful destruction successful, exit code 0 [2021-11-20 23:25:43,405 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 65 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable66 [2021-11-20 23:25:43,405 INFO L402 AbstractCegarLoop]: === Iteration 68 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:25:43,406 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:25:43,406 INFO L85 PathProgramCache]: Analyzing trace with hash 75680824, now seen corresponding path program 65 times [2021-11-20 23:25:43,406 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:25:43,406 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [693559472] [2021-11-20 23:25:43,406 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:25:43,406 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:25:43,508 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:25:46,457 INFO L134 CoverageAnalysis]: Checked inductivity of 7854 backedges. 5052 proven. 2802 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:25:46,457 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:25:46,457 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [693559472] [2021-11-20 23:25:46,457 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [693559472] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:25:46,457 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [861982211] [2021-11-20 23:25:46,457 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-20 23:25:46,457 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:25:46,457 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:25:46,464 INFO L229 MonitoredProcess]: Starting monitored process 66 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:25:46,465 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (66)] Waiting until timeout for monitored process [2021-11-20 23:25:46,795 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 52 check-sat command(s) [2021-11-20 23:25:46,795 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:25:46,802 INFO L263 TraceCheckSpWp]: Trace formula consists of 1169 conjuncts, 106 conjunts are in the unsatisfiable core [2021-11-20 23:25:46,804 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:25:51,179 INFO L134 CoverageAnalysis]: Checked inductivity of 7854 backedges. 5202 proven. 2652 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:25:51,179 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:25:51,793 INFO L134 CoverageAnalysis]: Checked inductivity of 7854 backedges. 5202 proven. 2652 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:25:51,793 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [861982211] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:25:51,793 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [563311872] [2021-11-20 23:25:51,794 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-20 23:25:51,794 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:25:51,794 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:25:51,794 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:25:51,794 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:25:52,887 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:25:53,719 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:25:53,720 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:25:53,720 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [106, 106, 106] total 160 [2021-11-20 23:25:53,720 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1444841896] [2021-11-20 23:25:53,720 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:25:53,721 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 160 states [2021-11-20 23:25:53,721 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:25:53,722 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 160 interpolants. [2021-11-20 23:25:53,723 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5859, Invalid=22533, Unknown=0, NotChecked=0, Total=28392 [2021-11-20 23:25:53,723 INFO L87 Difference]: Start difference. First operand 317 states and 319 transitions. Second operand has 160 states, 160 states have (on average 3.3) internal successors, (528), 160 states have internal predecessors, (528), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:25:56,561 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:25:56,562 INFO L93 Difference]: Finished difference Result 686 states and 741 transitions. [2021-11-20 23:25:56,562 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 106 states. [2021-11-20 23:25:56,562 INFO L78 Accepts]: Start accepts. Automaton has has 160 states, 160 states have (on average 3.3) internal successors, (528), 160 states have internal predecessors, (528), 0 states have call successors, (0), 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 316 [2021-11-20 23:25:56,562 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:25:56,564 INFO L225 Difference]: With dead ends: 686 [2021-11-20 23:25:56,564 INFO L226 Difference]: Without dead ends: 475 [2021-11-20 23:25:56,569 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1104 GetRequests, 885 SyntacticMatches, 0 SemanticMatches, 219 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11680 ImplicationChecksByTransitivity, 8.3s TimeCoverageRelationStatistics Valid=11373, Invalid=37247, Unknown=0, NotChecked=0, Total=48620 [2021-11-20 23:25:56,570 INFO L933 BasicCegarLoop]: 106 mSDtfsCounter, 607 mSDsluCounter, 1117 mSDsCounter, 0 mSdLazyCounter, 1280 mSolverCounterSat, 545 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 607 SdHoareTripleChecker+Valid, 1223 SdHoareTripleChecker+Invalid, 1825 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 545 IncrementalHoareTripleChecker+Valid, 1280 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2021-11-20 23:25:56,570 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [607 Valid, 1223 Invalid, 1825 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [545 Valid, 1280 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2021-11-20 23:25:56,571 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 475 states. [2021-11-20 23:25:56,606 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 475 to 319. [2021-11-20 23:25:56,606 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 319 states, 318 states have (on average 1.009433962264151) internal successors, (321), 318 states have internal predecessors, (321), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:25:56,607 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 319 states to 319 states and 321 transitions. [2021-11-20 23:25:56,607 INFO L78 Accepts]: Start accepts. Automaton has 319 states and 321 transitions. Word has length 316 [2021-11-20 23:25:56,607 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:25:56,607 INFO L470 AbstractCegarLoop]: Abstraction has 319 states and 321 transitions. [2021-11-20 23:25:56,607 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 160 states, 160 states have (on average 3.3) internal successors, (528), 160 states have internal predecessors, (528), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:25:56,607 INFO L276 IsEmpty]: Start isEmpty. Operand 319 states and 321 transitions. [2021-11-20 23:25:56,608 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 319 [2021-11-20 23:25:56,608 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:25:56,609 INFO L514 BasicCegarLoop]: trace histogram [53, 52, 52, 51, 51, 51, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:25:56,636 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (66)] Forceful destruction successful, exit code 0 [2021-11-20 23:25:56,809 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 66 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable67 [2021-11-20 23:25:56,809 INFO L402 AbstractCegarLoop]: === Iteration 69 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:25:56,809 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:25:56,810 INFO L85 PathProgramCache]: Analyzing trace with hash -1178209251, now seen corresponding path program 66 times [2021-11-20 23:25:56,810 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:25:56,810 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2105890032] [2021-11-20 23:25:56,810 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:25:56,810 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:25:56,961 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:25:58,142 INFO L134 CoverageAnalysis]: Checked inductivity of 7958 backedges. 2652 proven. 5306 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:25:58,142 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:25:58,142 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2105890032] [2021-11-20 23:25:58,142 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2105890032] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:25:58,142 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [206344172] [2021-11-20 23:25:58,142 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-20 23:25:58,142 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:25:58,142 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:25:58,143 INFO L229 MonitoredProcess]: Starting monitored process 67 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:25:58,146 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (67)] Waiting until timeout for monitored process [2021-11-20 23:25:58,295 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-20 23:25:58,295 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:25:58,302 INFO L263 TraceCheckSpWp]: Trace formula consists of 1179 conjuncts, 107 conjunts are in the unsatisfiable core [2021-11-20 23:25:58,304 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:25:58,896 INFO L134 CoverageAnalysis]: Checked inductivity of 7958 backedges. 2756 proven. 5202 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:25:58,896 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:25:59,539 INFO L134 CoverageAnalysis]: Checked inductivity of 7958 backedges. 2756 proven. 5202 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:25:59,539 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [206344172] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:25:59,539 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1919109623] [2021-11-20 23:25:59,540 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-20 23:25:59,540 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:25:59,540 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:25:59,540 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:25:59,540 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:26:00,637 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:26:01,076 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:26:01,076 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:26:01,077 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [55, 55, 55] total 58 [2021-11-20 23:26:01,077 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [78003393] [2021-11-20 23:26:01,077 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:26:01,077 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 59 states [2021-11-20 23:26:01,077 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:26:01,078 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 59 interpolants. [2021-11-20 23:26:01,078 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1595, Invalid=2961, Unknown=0, NotChecked=0, Total=4556 [2021-11-20 23:26:01,078 INFO L87 Difference]: Start difference. First operand 319 states and 321 transitions. Second operand has 59 states, 59 states have (on average 5.745762711864407) internal successors, (339), 58 states have internal predecessors, (339), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:26:02,260 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:26:02,260 INFO L93 Difference]: Finished difference Result 336 states and 339 transitions. [2021-11-20 23:26:02,260 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 112 states. [2021-11-20 23:26:02,260 INFO L78 Accepts]: Start accepts. Automaton has has 59 states, 59 states have (on average 5.745762711864407) internal successors, (339), 58 states have internal predecessors, (339), 0 states have call successors, (0), 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 318 [2021-11-20 23:26:02,261 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:26:02,262 INFO L225 Difference]: With dead ends: 336 [2021-11-20 23:26:02,262 INFO L226 Difference]: Without dead ends: 334 [2021-11-20 23:26:02,263 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1113 GetRequests, 991 SyntacticMatches, 1 SemanticMatches, 121 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4120 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=4790, Invalid=10216, Unknown=0, NotChecked=0, Total=15006 [2021-11-20 23:26:02,263 INFO L933 BasicCegarLoop]: 61 mSDtfsCounter, 279 mSDsluCounter, 432 mSDsCounter, 0 mSdLazyCounter, 566 mSolverCounterSat, 217 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 279 SdHoareTripleChecker+Valid, 485 SdHoareTripleChecker+Invalid, 783 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 217 IncrementalHoareTripleChecker+Valid, 566 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-20 23:26:02,263 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [279 Valid, 485 Invalid, 783 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [217 Valid, 566 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-20 23:26:02,264 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 334 states. [2021-11-20 23:26:02,295 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 334 to 327. [2021-11-20 23:26:02,295 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 327 states, 326 states have (on average 1.00920245398773) internal successors, (329), 326 states have internal predecessors, (329), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:26:02,295 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 327 states to 327 states and 329 transitions. [2021-11-20 23:26:02,295 INFO L78 Accepts]: Start accepts. Automaton has 327 states and 329 transitions. Word has length 318 [2021-11-20 23:26:02,296 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:26:02,296 INFO L470 AbstractCegarLoop]: Abstraction has 327 states and 329 transitions. [2021-11-20 23:26:02,296 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 59 states, 59 states have (on average 5.745762711864407) internal successors, (339), 58 states have internal predecessors, (339), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:26:02,296 INFO L276 IsEmpty]: Start isEmpty. Operand 327 states and 329 transitions. [2021-11-20 23:26:02,297 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 327 [2021-11-20 23:26:02,297 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:26:02,297 INFO L514 BasicCegarLoop]: trace histogram [54, 53, 53, 53, 53, 52, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:26:02,318 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (67)] Forceful destruction successful, exit code 0 [2021-11-20 23:26:02,497 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable68,67 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:26:02,498 INFO L402 AbstractCegarLoop]: === Iteration 70 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:26:02,498 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:26:02,498 INFO L85 PathProgramCache]: Analyzing trace with hash -736175869, now seen corresponding path program 67 times [2021-11-20 23:26:02,498 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:26:02,498 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [191861914] [2021-11-20 23:26:02,498 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:26:02,498 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:26:02,639 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:26:05,841 INFO L134 CoverageAnalysis]: Checked inductivity of 8374 backedges. 5462 proven. 2912 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:26:05,841 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:26:05,841 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [191861914] [2021-11-20 23:26:05,842 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [191861914] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:26:05,842 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1946361050] [2021-11-20 23:26:05,842 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-20 23:26:05,842 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:26:05,842 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:26:05,843 INFO L229 MonitoredProcess]: Starting monitored process 68 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:26:05,843 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (68)] Waiting until timeout for monitored process [2021-11-20 23:26:05,999 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:26:06,004 INFO L263 TraceCheckSpWp]: Trace formula consists of 1203 conjuncts, 108 conjunts are in the unsatisfiable core [2021-11-20 23:26:06,007 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:26:10,603 INFO L134 CoverageAnalysis]: Checked inductivity of 8374 backedges. 5616 proven. 2756 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-20 23:26:10,604 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:26:11,246 INFO L134 CoverageAnalysis]: Checked inductivity of 8374 backedges. 5616 proven. 2756 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-20 23:26:11,246 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1946361050] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:26:11,246 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [33404420] [2021-11-20 23:26:11,247 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-20 23:26:11,247 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:26:11,247 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:26:11,247 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:26:11,247 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:26:12,453 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:26:13,321 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:26:13,322 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:26:13,322 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [109, 108, 108] total 164 [2021-11-20 23:26:13,322 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [305855642] [2021-11-20 23:26:13,322 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:26:13,323 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 164 states [2021-11-20 23:26:13,323 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:26:13,324 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 164 interpolants. [2021-11-20 23:26:13,325 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6132, Invalid=23624, Unknown=0, NotChecked=0, Total=29756 [2021-11-20 23:26:13,325 INFO L87 Difference]: Start difference. First operand 327 states and 329 transitions. Second operand has 164 states, 164 states have (on average 3.3292682926829267) internal successors, (546), 164 states have internal predecessors, (546), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:26:16,170 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:26:16,170 INFO L93 Difference]: Finished difference Result 705 states and 761 transitions. [2021-11-20 23:26:16,170 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 108 states. [2021-11-20 23:26:16,170 INFO L78 Accepts]: Start accepts. Automaton has has 164 states, 164 states have (on average 3.3292682926829267) internal successors, (546), 164 states have internal predecessors, (546), 0 states have call successors, (0), 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 326 [2021-11-20 23:26:16,170 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:26:16,172 INFO L225 Difference]: With dead ends: 705 [2021-11-20 23:26:16,172 INFO L226 Difference]: Without dead ends: 488 [2021-11-20 23:26:16,176 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1138 GetRequests, 914 SyntacticMatches, 0 SemanticMatches, 224 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12258 ImplicationChecksByTransitivity, 8.8s TimeCoverageRelationStatistics Valid=11858, Invalid=38992, Unknown=0, NotChecked=0, Total=50850 [2021-11-20 23:26:16,176 INFO L933 BasicCegarLoop]: 108 mSDtfsCounter, 575 mSDsluCounter, 1106 mSDsCounter, 0 mSdLazyCounter, 1274 mSolverCounterSat, 641 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 575 SdHoareTripleChecker+Valid, 1214 SdHoareTripleChecker+Invalid, 1915 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 641 IncrementalHoareTripleChecker+Valid, 1274 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2021-11-20 23:26:16,176 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [575 Valid, 1214 Invalid, 1915 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [641 Valid, 1274 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2021-11-20 23:26:16,177 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 488 states. [2021-11-20 23:26:16,229 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 488 to 329. [2021-11-20 23:26:16,229 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 329 states, 328 states have (on average 1.0091463414634145) internal successors, (331), 328 states have internal predecessors, (331), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:26:16,229 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 329 states to 329 states and 331 transitions. [2021-11-20 23:26:16,229 INFO L78 Accepts]: Start accepts. Automaton has 329 states and 331 transitions. Word has length 326 [2021-11-20 23:26:16,229 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:26:16,229 INFO L470 AbstractCegarLoop]: Abstraction has 329 states and 331 transitions. [2021-11-20 23:26:16,230 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 164 states, 164 states have (on average 3.3292682926829267) internal successors, (546), 164 states have internal predecessors, (546), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:26:16,230 INFO L276 IsEmpty]: Start isEmpty. Operand 329 states and 331 transitions. [2021-11-20 23:26:16,231 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 329 [2021-11-20 23:26:16,231 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:26:16,231 INFO L514 BasicCegarLoop]: trace histogram [54, 54, 53, 53, 53, 53, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:26:16,251 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (68)] Forceful destruction successful, exit code 0 [2021-11-20 23:26:16,431 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 68 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable69 [2021-11-20 23:26:16,432 INFO L402 AbstractCegarLoop]: === Iteration 71 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:26:16,432 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:26:16,432 INFO L85 PathProgramCache]: Analyzing trace with hash 426845864, now seen corresponding path program 68 times [2021-11-20 23:26:16,432 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:26:16,432 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [430658299] [2021-11-20 23:26:16,432 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:26:16,432 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:26:16,536 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:26:19,634 INFO L134 CoverageAnalysis]: Checked inductivity of 8480 backedges. 5462 proven. 3018 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:26:19,634 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:26:19,634 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [430658299] [2021-11-20 23:26:19,635 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [430658299] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:26:19,635 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1541551601] [2021-11-20 23:26:19,635 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-20 23:26:19,635 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:26:19,635 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:26:19,636 INFO L229 MonitoredProcess]: Starting monitored process 69 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:26:19,639 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (69)] Waiting until timeout for monitored process [2021-11-20 23:26:19,917 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 54 check-sat command(s) [2021-11-20 23:26:19,918 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:26:19,924 INFO L263 TraceCheckSpWp]: Trace formula consists of 1213 conjuncts, 110 conjunts are in the unsatisfiable core [2021-11-20 23:26:19,926 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:26:23,415 INFO L134 CoverageAnalysis]: Checked inductivity of 8480 backedges. 2862 proven. 5618 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:26:23,415 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:26:24,054 INFO L134 CoverageAnalysis]: Checked inductivity of 8480 backedges. 2862 proven. 5618 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:26:24,054 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1541551601] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:26:24,054 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [153202457] [2021-11-20 23:26:24,055 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-20 23:26:24,055 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:26:24,055 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:26:24,055 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:26:24,055 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:26:25,083 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:26:25,952 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:26:25,952 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:26:25,953 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [110, 56, 56] total 165 [2021-11-20 23:26:25,953 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2006366187] [2021-11-20 23:26:25,953 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:26:25,954 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 165 states [2021-11-20 23:26:25,954 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:26:25,954 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 165 interpolants. [2021-11-20 23:26:25,955 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=4708, Invalid=25394, Unknown=0, NotChecked=0, Total=30102 [2021-11-20 23:26:25,956 INFO L87 Difference]: Start difference. First operand 329 states and 331 transitions. Second operand has 165 states, 165 states have (on average 3.9696969696969697) internal successors, (655), 165 states have internal predecessors, (655), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:26:33,962 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:26:33,963 INFO L93 Difference]: Finished difference Result 719 states and 777 transitions. [2021-11-20 23:26:33,963 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 221 states. [2021-11-20 23:26:33,963 INFO L78 Accepts]: Start accepts. Automaton has has 165 states, 165 states have (on average 3.9696969696969697) internal successors, (655), 165 states have internal predecessors, (655), 0 states have call successors, (0), 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 328 [2021-11-20 23:26:33,963 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:26:33,965 INFO L225 Difference]: With dead ends: 719 [2021-11-20 23:26:33,965 INFO L226 Difference]: Without dead ends: 500 [2021-11-20 23:26:33,971 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1362 GetRequests, 973 SyntacticMatches, 1 SemanticMatches, 388 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 52819 ImplicationChecksByTransitivity, 12.2s TimeCoverageRelationStatistics Valid=23071, Invalid=128639, Unknown=0, NotChecked=0, Total=151710 [2021-11-20 23:26:33,971 INFO L933 BasicCegarLoop]: 57 mSDtfsCounter, 1064 mSDsluCounter, 830 mSDsCounter, 0 mSdLazyCounter, 3889 mSolverCounterSat, 1025 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1064 SdHoareTripleChecker+Valid, 886 SdHoareTripleChecker+Invalid, 4914 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1025 IncrementalHoareTripleChecker+Valid, 3889 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.7s IncrementalHoareTripleChecker+Time [2021-11-20 23:26:33,971 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1064 Valid, 886 Invalid, 4914 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1025 Valid, 3889 Invalid, 0 Unknown, 0 Unchecked, 1.7s Time] [2021-11-20 23:26:33,972 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 500 states. [2021-11-20 23:26:34,002 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 500 to 335. [2021-11-20 23:26:34,002 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 335 states, 334 states have (on average 1.0089820359281436) internal successors, (337), 334 states have internal predecessors, (337), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:26:34,003 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 335 states to 335 states and 337 transitions. [2021-11-20 23:26:34,003 INFO L78 Accepts]: Start accepts. Automaton has 335 states and 337 transitions. Word has length 328 [2021-11-20 23:26:34,003 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:26:34,003 INFO L470 AbstractCegarLoop]: Abstraction has 335 states and 337 transitions. [2021-11-20 23:26:34,003 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 165 states, 165 states have (on average 3.9696969696969697) internal successors, (655), 165 states have internal predecessors, (655), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:26:34,003 INFO L276 IsEmpty]: Start isEmpty. Operand 335 states and 337 transitions. [2021-11-20 23:26:34,004 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 335 [2021-11-20 23:26:34,004 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:26:34,005 INFO L514 BasicCegarLoop]: trace histogram [55, 55, 54, 54, 54, 54, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:26:34,026 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (69)] Forceful destruction successful, exit code 0 [2021-11-20 23:26:34,205 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 69 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable70 [2021-11-20 23:26:34,206 INFO L402 AbstractCegarLoop]: === Iteration 72 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:26:34,206 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:26:34,206 INFO L85 PathProgramCache]: Analyzing trace with hash -89161152, now seen corresponding path program 69 times [2021-11-20 23:26:34,206 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:26:34,207 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1620861772] [2021-11-20 23:26:34,207 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:26:34,207 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:26:34,335 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:26:37,579 INFO L134 CoverageAnalysis]: Checked inductivity of 8802 backedges. 5673 proven. 3129 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:26:37,579 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:26:37,579 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1620861772] [2021-11-20 23:26:37,579 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1620861772] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:26:37,579 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1300481668] [2021-11-20 23:26:37,579 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-20 23:26:37,580 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:26:37,580 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:26:37,580 INFO L229 MonitoredProcess]: Starting monitored process 70 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:26:37,581 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (70)] Waiting until timeout for monitored process [2021-11-20 23:26:37,734 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-20 23:26:37,734 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:26:37,741 INFO L263 TraceCheckSpWp]: Trace formula consists of 1235 conjuncts, 112 conjunts are in the unsatisfiable core [2021-11-20 23:26:37,743 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:26:41,313 INFO L134 CoverageAnalysis]: Checked inductivity of 8802 backedges. 2970 proven. 5832 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:26:41,313 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:26:41,980 INFO L134 CoverageAnalysis]: Checked inductivity of 8802 backedges. 2970 proven. 5832 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:26:41,980 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1300481668] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:26:41,980 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1946384327] [2021-11-20 23:26:41,981 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-20 23:26:41,981 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:26:41,981 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:26:41,981 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:26:41,981 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:26:43,264 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:26:44,159 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:26:44,159 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:26:44,160 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [112, 57, 57] total 168 [2021-11-20 23:26:44,160 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2068212516] [2021-11-20 23:26:44,160 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:26:44,160 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 168 states [2021-11-20 23:26:44,160 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:26:44,161 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 168 interpolants. [2021-11-20 23:26:44,162 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=4877, Invalid=26275, Unknown=0, NotChecked=0, Total=31152 [2021-11-20 23:26:44,162 INFO L87 Difference]: Start difference. First operand 335 states and 337 transitions. Second operand has 168 states, 168 states have (on average 3.9702380952380953) internal successors, (667), 168 states have internal predecessors, (667), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:26:52,223 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:26:52,223 INFO L93 Difference]: Finished difference Result 732 states and 791 transitions. [2021-11-20 23:26:52,224 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 225 states. [2021-11-20 23:26:52,224 INFO L78 Accepts]: Start accepts. Automaton has has 168 states, 168 states have (on average 3.9702380952380953) internal successors, (667), 168 states have internal predecessors, (667), 0 states have call successors, (0), 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 334 [2021-11-20 23:26:52,224 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:26:52,226 INFO L225 Difference]: With dead ends: 732 [2021-11-20 23:26:52,226 INFO L226 Difference]: Without dead ends: 509 [2021-11-20 23:26:52,233 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1387 GetRequests, 991 SyntacticMatches, 1 SemanticMatches, 395 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 54760 ImplicationChecksByTransitivity, 12.6s TimeCoverageRelationStatistics Valid=23910, Invalid=133302, Unknown=0, NotChecked=0, Total=157212 [2021-11-20 23:26:52,233 INFO L933 BasicCegarLoop]: 58 mSDtfsCounter, 1142 mSDsluCounter, 720 mSDsCounter, 0 mSdLazyCounter, 3461 mSolverCounterSat, 1254 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1142 SdHoareTripleChecker+Valid, 777 SdHoareTripleChecker+Invalid, 4715 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1254 IncrementalHoareTripleChecker+Valid, 3461 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.5s IncrementalHoareTripleChecker+Time [2021-11-20 23:26:52,234 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [1142 Valid, 777 Invalid, 4715 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1254 Valid, 3461 Invalid, 0 Unknown, 0 Unchecked, 1.5s Time] [2021-11-20 23:26:52,235 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 509 states. [2021-11-20 23:26:52,268 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 509 to 341. [2021-11-20 23:26:52,269 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 341 states, 340 states have (on average 1.0088235294117647) internal successors, (343), 340 states have internal predecessors, (343), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:26:52,269 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 341 states to 341 states and 343 transitions. [2021-11-20 23:26:52,269 INFO L78 Accepts]: Start accepts. Automaton has 341 states and 343 transitions. Word has length 334 [2021-11-20 23:26:52,269 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:26:52,269 INFO L470 AbstractCegarLoop]: Abstraction has 341 states and 343 transitions. [2021-11-20 23:26:52,270 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 168 states, 168 states have (on average 3.9702380952380953) internal successors, (667), 168 states have internal predecessors, (667), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:26:52,270 INFO L276 IsEmpty]: Start isEmpty. Operand 341 states and 343 transitions. [2021-11-20 23:26:52,271 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 341 [2021-11-20 23:26:52,271 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:26:52,271 INFO L514 BasicCegarLoop]: trace histogram [56, 56, 55, 55, 55, 55, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:26:52,292 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (70)] Forceful destruction successful, exit code 0 [2021-11-20 23:26:52,472 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable71,70 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:26:52,472 INFO L402 AbstractCegarLoop]: === Iteration 73 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:26:52,473 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:26:52,474 INFO L85 PathProgramCache]: Analyzing trace with hash 1029149208, now seen corresponding path program 70 times [2021-11-20 23:26:52,474 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:26:52,474 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1899821492] [2021-11-20 23:26:52,475 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:26:52,475 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:26:52,630 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:26:55,912 INFO L134 CoverageAnalysis]: Checked inductivity of 9130 backedges. 5888 proven. 3242 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:26:55,912 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:26:55,912 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1899821492] [2021-11-20 23:26:55,912 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1899821492] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:26:55,912 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1131611811] [2021-11-20 23:26:55,912 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-20 23:26:55,912 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:26:55,912 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:26:55,913 INFO L229 MonitoredProcess]: Starting monitored process 71 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:26:55,914 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (71)] Waiting until timeout for monitored process [2021-11-20 23:26:56,062 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:26:56,067 INFO L263 TraceCheckSpWp]: Trace formula consists of 1257 conjuncts, 114 conjunts are in the unsatisfiable core [2021-11-20 23:26:56,070 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:27:00,952 INFO L134 CoverageAnalysis]: Checked inductivity of 9130 backedges. 6050 proven. 3080 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:27:00,952 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:27:01,638 INFO L134 CoverageAnalysis]: Checked inductivity of 9130 backedges. 6050 proven. 3080 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:27:01,639 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1131611811] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:27:01,639 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [355493803] [2021-11-20 23:27:01,640 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-20 23:27:01,640 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:27:01,640 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:27:01,640 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:27:01,640 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:27:02,919 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:27:03,831 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:27:03,831 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:27:03,832 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [114, 114, 114] total 172 [2021-11-20 23:27:03,832 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1733085842] [2021-11-20 23:27:03,832 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:27:03,833 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 172 states [2021-11-20 23:27:03,833 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:27:03,835 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 172 interpolants. [2021-11-20 23:27:03,837 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6755, Invalid=25825, Unknown=0, NotChecked=0, Total=32580 [2021-11-20 23:27:03,837 INFO L87 Difference]: Start difference. First operand 341 states and 343 transitions. Second operand has 172 states, 172 states have (on average 3.302325581395349) internal successors, (568), 172 states have internal predecessors, (568), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:27:06,887 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:27:06,887 INFO L93 Difference]: Finished difference Result 738 states and 797 transitions. [2021-11-20 23:27:06,888 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 114 states. [2021-11-20 23:27:06,888 INFO L78 Accepts]: Start accepts. Automaton has has 172 states, 172 states have (on average 3.302325581395349) internal successors, (568), 172 states have internal predecessors, (568), 0 states have call successors, (0), 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 340 [2021-11-20 23:27:06,888 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:27:06,890 INFO L225 Difference]: With dead ends: 738 [2021-11-20 23:27:06,890 INFO L226 Difference]: Without dead ends: 511 [2021-11-20 23:27:06,892 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1188 GetRequests, 953 SyntacticMatches, 0 SemanticMatches, 235 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13362 ImplicationChecksByTransitivity, 9.2s TimeCoverageRelationStatistics Valid=13141, Invalid=42791, Unknown=0, NotChecked=0, Total=55932 [2021-11-20 23:27:06,892 INFO L933 BasicCegarLoop]: 114 mSDtfsCounter, 599 mSDsluCounter, 1226 mSDsCounter, 0 mSdLazyCounter, 1395 mSolverCounterSat, 675 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 599 SdHoareTripleChecker+Valid, 1340 SdHoareTripleChecker+Invalid, 2070 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 675 IncrementalHoareTripleChecker+Valid, 1395 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2021-11-20 23:27:06,893 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [599 Valid, 1340 Invalid, 2070 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [675 Valid, 1395 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2021-11-20 23:27:06,893 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 511 states. [2021-11-20 23:27:06,924 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 511 to 343. [2021-11-20 23:27:06,925 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 343 states, 342 states have (on average 1.0087719298245614) internal successors, (345), 342 states have internal predecessors, (345), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:27:06,925 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 343 states to 343 states and 345 transitions. [2021-11-20 23:27:06,925 INFO L78 Accepts]: Start accepts. Automaton has 343 states and 345 transitions. Word has length 340 [2021-11-20 23:27:06,925 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:27:06,925 INFO L470 AbstractCegarLoop]: Abstraction has 343 states and 345 transitions. [2021-11-20 23:27:06,926 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 172 states, 172 states have (on average 3.302325581395349) internal successors, (568), 172 states have internal predecessors, (568), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:27:06,926 INFO L276 IsEmpty]: Start isEmpty. Operand 343 states and 345 transitions. [2021-11-20 23:27:06,927 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 343 [2021-11-20 23:27:06,927 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:27:06,927 INFO L514 BasicCegarLoop]: trace histogram [57, 56, 56, 55, 55, 55, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:27:06,950 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (71)] Forceful destruction successful, exit code 0 [2021-11-20 23:27:07,128 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable72,71 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:27:07,129 INFO L402 AbstractCegarLoop]: === Iteration 74 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:27:07,129 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:27:07,130 INFO L85 PathProgramCache]: Analyzing trace with hash -1265984771, now seen corresponding path program 71 times [2021-11-20 23:27:07,130 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:27:07,130 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [917972057] [2021-11-20 23:27:07,131 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:27:07,131 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:27:07,344 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:27:08,585 INFO L134 CoverageAnalysis]: Checked inductivity of 9242 backedges. 3080 proven. 6162 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:27:08,585 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:27:08,585 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [917972057] [2021-11-20 23:27:08,586 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [917972057] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:27:08,586 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1806302621] [2021-11-20 23:27:08,586 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-20 23:27:08,586 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:27:08,586 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:27:08,586 INFO L229 MonitoredProcess]: Starting monitored process 72 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:27:08,588 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (72)] Waiting until timeout for monitored process [2021-11-20 23:27:08,876 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 57 check-sat command(s) [2021-11-20 23:27:08,876 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:27:08,883 INFO L263 TraceCheckSpWp]: Trace formula consists of 1267 conjuncts, 115 conjunts are in the unsatisfiable core [2021-11-20 23:27:08,885 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:27:09,543 INFO L134 CoverageAnalysis]: Checked inductivity of 9242 backedges. 3192 proven. 6050 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:27:09,543 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:27:10,146 INFO L134 CoverageAnalysis]: Checked inductivity of 9242 backedges. 3192 proven. 6050 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:27:10,146 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1806302621] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:27:10,146 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1027547820] [2021-11-20 23:27:10,147 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-20 23:27:10,147 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:27:10,147 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:27:10,147 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:27:10,147 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:27:11,391 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:27:11,859 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:27:11,859 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:27:11,859 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [59, 59, 59] total 62 [2021-11-20 23:27:11,859 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [304738958] [2021-11-20 23:27:11,859 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:27:11,860 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 63 states [2021-11-20 23:27:11,860 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:27:11,861 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 63 interpolants. [2021-11-20 23:27:11,861 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1825, Invalid=3287, Unknown=0, NotChecked=0, Total=5112 [2021-11-20 23:27:11,861 INFO L87 Difference]: Start difference. First operand 343 states and 345 transitions. Second operand has 63 states, 63 states have (on average 5.761904761904762) internal successors, (363), 62 states have internal predecessors, (363), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:27:13,169 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:27:13,169 INFO L93 Difference]: Finished difference Result 360 states and 363 transitions. [2021-11-20 23:27:13,170 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 120 states. [2021-11-20 23:27:13,170 INFO L78 Accepts]: Start accepts. Automaton has has 63 states, 63 states have (on average 5.761904761904762) internal successors, (363), 62 states have internal predecessors, (363), 0 states have call successors, (0), 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 342 [2021-11-20 23:27:13,170 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:27:13,171 INFO L225 Difference]: With dead ends: 360 [2021-11-20 23:27:13,171 INFO L226 Difference]: Without dead ends: 358 [2021-11-20 23:27:13,173 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1197 GetRequests, 1067 SyntacticMatches, 1 SemanticMatches, 129 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4656 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=5488, Invalid=11542, Unknown=0, NotChecked=0, Total=17030 [2021-11-20 23:27:13,173 INFO L933 BasicCegarLoop]: 65 mSDtfsCounter, 243 mSDsluCounter, 456 mSDsCounter, 0 mSdLazyCounter, 599 mSolverCounterSat, 177 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 243 SdHoareTripleChecker+Valid, 512 SdHoareTripleChecker+Invalid, 776 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 177 IncrementalHoareTripleChecker+Valid, 599 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-20 23:27:13,173 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [243 Valid, 512 Invalid, 776 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [177 Valid, 599 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-20 23:27:13,174 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 358 states. [2021-11-20 23:27:13,250 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 358 to 351. [2021-11-20 23:27:13,250 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 351 states, 350 states have (on average 1.0085714285714287) internal successors, (353), 350 states have internal predecessors, (353), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:27:13,250 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 351 states to 351 states and 353 transitions. [2021-11-20 23:27:13,251 INFO L78 Accepts]: Start accepts. Automaton has 351 states and 353 transitions. Word has length 342 [2021-11-20 23:27:13,251 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:27:13,251 INFO L470 AbstractCegarLoop]: Abstraction has 351 states and 353 transitions. [2021-11-20 23:27:13,251 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 63 states, 63 states have (on average 5.761904761904762) internal successors, (363), 62 states have internal predecessors, (363), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:27:13,251 INFO L276 IsEmpty]: Start isEmpty. Operand 351 states and 353 transitions. [2021-11-20 23:27:13,253 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 351 [2021-11-20 23:27:13,253 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:27:13,253 INFO L514 BasicCegarLoop]: trace histogram [58, 57, 57, 57, 57, 56, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:27:13,274 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (72)] Forceful destruction successful, exit code 0 [2021-11-20 23:27:13,454 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable73,72 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:27:13,454 INFO L402 AbstractCegarLoop]: === Iteration 75 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:27:13,454 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:27:13,454 INFO L85 PathProgramCache]: Analyzing trace with hash -423714845, now seen corresponding path program 72 times [2021-11-20 23:27:13,454 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:27:13,455 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1172929770] [2021-11-20 23:27:13,455 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:27:13,455 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:27:13,599 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:27:17,053 INFO L134 CoverageAnalysis]: Checked inductivity of 9690 backedges. 6330 proven. 3360 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:27:17,053 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:27:17,053 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1172929770] [2021-11-20 23:27:17,053 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1172929770] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:27:17,053 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2027302364] [2021-11-20 23:27:17,053 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-20 23:27:17,053 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:27:17,053 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:27:17,054 INFO L229 MonitoredProcess]: Starting monitored process 73 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:27:17,055 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (73)] Waiting until timeout for monitored process [2021-11-20 23:27:17,215 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-20 23:27:17,215 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:27:17,222 INFO L263 TraceCheckSpWp]: Trace formula consists of 1291 conjuncts, 117 conjunts are in the unsatisfiable core [2021-11-20 23:27:17,225 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:27:22,367 INFO L134 CoverageAnalysis]: Checked inductivity of 9690 backedges. 6498 proven. 3192 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:27:22,367 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:27:23,106 INFO L134 CoverageAnalysis]: Checked inductivity of 9690 backedges. 6498 proven. 3192 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:27:23,106 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2027302364] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:27:23,106 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [663597124] [2021-11-20 23:27:23,107 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-20 23:27:23,107 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:27:23,107 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:27:23,107 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:27:23,107 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:27:24,114 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:27:25,055 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:27:25,055 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:27:25,056 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [117, 117, 117] total 179 [2021-11-20 23:27:25,056 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [229683091] [2021-11-20 23:27:25,056 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:27:25,057 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 179 states [2021-11-20 23:27:25,057 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:27:25,058 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 179 interpolants. [2021-11-20 23:27:25,059 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7346, Invalid=27810, Unknown=0, NotChecked=0, Total=35156 [2021-11-20 23:27:25,059 INFO L87 Difference]: Start difference. First operand 351 states and 353 transitions. Second operand has 179 states, 179 states have (on average 3.3240223463687153) internal successors, (595), 179 states have internal predecessors, (595), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:27:30,428 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:27:30,428 INFO L93 Difference]: Finished difference Result 991 states and 1053 transitions. [2021-11-20 23:27:30,428 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 175 states. [2021-11-20 23:27:30,428 INFO L78 Accepts]: Start accepts. Automaton has has 179 states, 179 states have (on average 3.3240223463687153) internal successors, (595), 179 states have internal predecessors, (595), 0 states have call successors, (0), 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 350 [2021-11-20 23:27:30,429 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:27:30,430 INFO L225 Difference]: With dead ends: 991 [2021-11-20 23:27:30,430 INFO L226 Difference]: Without dead ends: 529 [2021-11-20 23:27:30,434 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1280 GetRequests, 979 SyntacticMatches, 0 SemanticMatches, 301 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23196 ImplicationChecksByTransitivity, 11.3s TimeCoverageRelationStatistics Valid=20975, Invalid=70531, Unknown=0, NotChecked=0, Total=91506 [2021-11-20 23:27:30,434 INFO L933 BasicCegarLoop]: 116 mSDtfsCounter, 758 mSDsluCounter, 1665 mSDsCounter, 0 mSdLazyCounter, 1843 mSolverCounterSat, 502 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 758 SdHoareTripleChecker+Valid, 1781 SdHoareTripleChecker+Invalid, 2345 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 502 IncrementalHoareTripleChecker+Valid, 1843 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2021-11-20 23:27:30,434 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [758 Valid, 1781 Invalid, 2345 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [502 Valid, 1843 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2021-11-20 23:27:30,435 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 529 states. [2021-11-20 23:27:30,474 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 529 to 355. [2021-11-20 23:27:30,474 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 355 states, 354 states have (on average 1.0084745762711864) internal successors, (357), 354 states have internal predecessors, (357), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:27:30,475 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 355 states to 355 states and 357 transitions. [2021-11-20 23:27:30,475 INFO L78 Accepts]: Start accepts. Automaton has 355 states and 357 transitions. Word has length 350 [2021-11-20 23:27:30,475 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:27:30,475 INFO L470 AbstractCegarLoop]: Abstraction has 355 states and 357 transitions. [2021-11-20 23:27:30,475 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 179 states, 179 states have (on average 3.3240223463687153) internal successors, (595), 179 states have internal predecessors, (595), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:27:30,475 INFO L276 IsEmpty]: Start isEmpty. Operand 355 states and 357 transitions. [2021-11-20 23:27:30,477 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 355 [2021-11-20 23:27:30,477 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:27:30,477 INFO L514 BasicCegarLoop]: trace histogram [59, 58, 58, 57, 57, 57, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:27:30,498 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (73)] Forceful destruction successful, exit code 0 [2021-11-20 23:27:30,678 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 73 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable74 [2021-11-20 23:27:30,678 INFO L402 AbstractCegarLoop]: === Iteration 76 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:27:30,679 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:27:30,680 INFO L85 PathProgramCache]: Analyzing trace with hash 1182230509, now seen corresponding path program 73 times [2021-11-20 23:27:30,680 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:27:30,680 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [623001487] [2021-11-20 23:27:30,681 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:27:30,681 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:27:30,836 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:27:32,123 INFO L134 CoverageAnalysis]: Checked inductivity of 9920 backedges. 3306 proven. 6614 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:27:32,123 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:27:32,124 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [623001487] [2021-11-20 23:27:32,124 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [623001487] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:27:32,124 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [502836838] [2021-11-20 23:27:32,124 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-20 23:27:32,124 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:27:32,124 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:27:32,125 INFO L229 MonitoredProcess]: Starting monitored process 74 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:27:32,125 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (74)] Waiting until timeout for monitored process [2021-11-20 23:27:32,282 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:27:32,288 INFO L263 TraceCheckSpWp]: Trace formula consists of 1311 conjuncts, 119 conjunts are in the unsatisfiable core [2021-11-20 23:27:32,290 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:27:32,914 INFO L134 CoverageAnalysis]: Checked inductivity of 9920 backedges. 3422 proven. 6498 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:27:32,914 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:27:33,560 INFO L134 CoverageAnalysis]: Checked inductivity of 9920 backedges. 3422 proven. 6498 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:27:33,560 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [502836838] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:27:33,561 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1475845641] [2021-11-20 23:27:33,561 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-20 23:27:33,561 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:27:33,562 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:27:33,562 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:27:33,562 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:27:35,010 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:27:35,518 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:27:35,519 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:27:35,519 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [61, 61, 61] total 64 [2021-11-20 23:27:35,519 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [918134234] [2021-11-20 23:27:35,519 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:27:35,520 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 65 states [2021-11-20 23:27:35,520 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:27:35,520 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 65 interpolants. [2021-11-20 23:27:35,521 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1946, Invalid=3456, Unknown=0, NotChecked=0, Total=5402 [2021-11-20 23:27:35,521 INFO L87 Difference]: Start difference. First operand 355 states and 357 transitions. Second operand has 65 states, 65 states have (on average 5.769230769230769) internal successors, (375), 64 states have internal predecessors, (375), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:27:36,912 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:27:36,912 INFO L93 Difference]: Finished difference Result 372 states and 375 transitions. [2021-11-20 23:27:36,913 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 124 states. [2021-11-20 23:27:36,913 INFO L78 Accepts]: Start accepts. Automaton has has 65 states, 65 states have (on average 5.769230769230769) internal successors, (375), 64 states have internal predecessors, (375), 0 states have call successors, (0), 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 354 [2021-11-20 23:27:36,913 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:27:36,914 INFO L225 Difference]: With dead ends: 372 [2021-11-20 23:27:36,914 INFO L226 Difference]: Without dead ends: 370 [2021-11-20 23:27:36,916 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1239 GetRequests, 1105 SyntacticMatches, 1 SemanticMatches, 133 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4936 ImplicationChecksByTransitivity, 2.6s TimeCoverageRelationStatistics Valid=5855, Invalid=12235, Unknown=0, NotChecked=0, Total=18090 [2021-11-20 23:27:36,916 INFO L933 BasicCegarLoop]: 67 mSDtfsCounter, 373 mSDsluCounter, 397 mSDsCounter, 0 mSdLazyCounter, 556 mSolverCounterSat, 242 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 373 SdHoareTripleChecker+Valid, 457 SdHoareTripleChecker+Invalid, 798 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 242 IncrementalHoareTripleChecker+Valid, 556 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-20 23:27:36,916 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [373 Valid, 457 Invalid, 798 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [242 Valid, 556 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-20 23:27:36,917 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 370 states. [2021-11-20 23:27:36,952 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 370 to 363. [2021-11-20 23:27:36,952 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 363 states, 362 states have (on average 1.0082872928176796) internal successors, (365), 362 states have internal predecessors, (365), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:27:36,953 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 363 states to 363 states and 365 transitions. [2021-11-20 23:27:36,953 INFO L78 Accepts]: Start accepts. Automaton has 363 states and 365 transitions. Word has length 354 [2021-11-20 23:27:36,953 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:27:36,953 INFO L470 AbstractCegarLoop]: Abstraction has 363 states and 365 transitions. [2021-11-20 23:27:36,953 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 65 states, 65 states have (on average 5.769230769230769) internal successors, (375), 64 states have internal predecessors, (375), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:27:36,953 INFO L276 IsEmpty]: Start isEmpty. Operand 363 states and 365 transitions. [2021-11-20 23:27:36,955 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 363 [2021-11-20 23:27:36,955 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:27:36,955 INFO L514 BasicCegarLoop]: trace histogram [60, 59, 59, 59, 59, 58, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:27:36,977 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (74)] Forceful destruction successful, exit code 0 [2021-11-20 23:27:37,155 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable75,74 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:27:37,155 INFO L402 AbstractCegarLoop]: === Iteration 77 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:27:37,156 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:27:37,156 INFO L85 PathProgramCache]: Analyzing trace with hash 1430748371, now seen corresponding path program 74 times [2021-11-20 23:27:37,156 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:27:37,156 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [376235254] [2021-11-20 23:27:37,156 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:27:37,156 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:27:37,280 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:27:41,034 INFO L134 CoverageAnalysis]: Checked inductivity of 10384 backedges. 6788 proven. 3596 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:27:41,034 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:27:41,034 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [376235254] [2021-11-20 23:27:41,034 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [376235254] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:27:41,034 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [363972280] [2021-11-20 23:27:41,035 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-20 23:27:41,035 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:27:41,035 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:27:41,035 INFO L229 MonitoredProcess]: Starting monitored process 75 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:27:41,036 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (75)] Waiting until timeout for monitored process [2021-11-20 23:27:41,391 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 60 check-sat command(s) [2021-11-20 23:27:41,391 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:27:41,400 INFO L263 TraceCheckSpWp]: Trace formula consists of 1335 conjuncts, 121 conjunts are in the unsatisfiable core [2021-11-20 23:27:41,403 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:27:47,042 INFO L134 CoverageAnalysis]: Checked inductivity of 10384 backedges. 6962 proven. 3422 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:27:47,042 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:27:47,913 INFO L134 CoverageAnalysis]: Checked inductivity of 10384 backedges. 6962 proven. 3422 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:27:47,913 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [363972280] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:27:47,913 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [809787663] [2021-11-20 23:27:47,914 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-20 23:27:47,914 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:27:47,914 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:27:47,914 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:27:47,914 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:27:49,099 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:27:50,063 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:27:50,063 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:27:50,064 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [121, 121, 121] total 185 [2021-11-20 23:27:50,064 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1428707343] [2021-11-20 23:27:50,064 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:27:50,065 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 185 states [2021-11-20 23:27:50,065 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:27:50,066 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 185 interpolants. [2021-11-20 23:27:50,067 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7838, Invalid=29604, Unknown=0, NotChecked=0, Total=37442 [2021-11-20 23:27:50,068 INFO L87 Difference]: Start difference. First operand 363 states and 365 transitions. Second operand has 185 states, 185 states have (on average 3.324324324324324) internal successors, (615), 185 states have internal predecessors, (615), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:27:56,060 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:27:56,060 INFO L93 Difference]: Finished difference Result 1025 states and 1089 transitions. [2021-11-20 23:27:56,060 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 181 states. [2021-11-20 23:27:56,060 INFO L78 Accepts]: Start accepts. Automaton has has 185 states, 185 states have (on average 3.324324324324324) internal successors, (615), 185 states have internal predecessors, (615), 0 states have call successors, (0), 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 362 [2021-11-20 23:27:56,061 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:27:56,063 INFO L225 Difference]: With dead ends: 1025 [2021-11-20 23:27:56,063 INFO L226 Difference]: Without dead ends: 547 [2021-11-20 23:27:56,067 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1324 GetRequests, 1013 SyntacticMatches, 0 SemanticMatches, 311 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24716 ImplicationChecksByTransitivity, 12.3s TimeCoverageRelationStatistics Valid=22417, Invalid=75239, Unknown=0, NotChecked=0, Total=97656 [2021-11-20 23:27:56,067 INFO L933 BasicCegarLoop]: 120 mSDtfsCounter, 766 mSDsluCounter, 1587 mSDsCounter, 0 mSdLazyCounter, 1779 mSolverCounterSat, 572 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 766 SdHoareTripleChecker+Valid, 1707 SdHoareTripleChecker+Invalid, 2351 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 572 IncrementalHoareTripleChecker+Valid, 1779 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2021-11-20 23:27:56,067 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [766 Valid, 1707 Invalid, 2351 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [572 Valid, 1779 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2021-11-20 23:27:56,068 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 547 states. [2021-11-20 23:27:56,104 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 547 to 367. [2021-11-20 23:27:56,105 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 367 states, 366 states have (on average 1.0081967213114753) internal successors, (369), 366 states have internal predecessors, (369), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:27:56,105 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 367 states to 367 states and 369 transitions. [2021-11-20 23:27:56,105 INFO L78 Accepts]: Start accepts. Automaton has 367 states and 369 transitions. Word has length 362 [2021-11-20 23:27:56,105 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:27:56,105 INFO L470 AbstractCegarLoop]: Abstraction has 367 states and 369 transitions. [2021-11-20 23:27:56,106 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 185 states, 185 states have (on average 3.324324324324324) internal successors, (615), 185 states have internal predecessors, (615), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:27:56,106 INFO L276 IsEmpty]: Start isEmpty. Operand 367 states and 369 transitions. [2021-11-20 23:27:56,107 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 367 [2021-11-20 23:27:56,107 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:27:56,107 INFO L514 BasicCegarLoop]: trace histogram [61, 60, 60, 59, 59, 59, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:27:56,129 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (75)] Forceful destruction successful, exit code 0 [2021-11-20 23:27:56,308 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 75 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable76 [2021-11-20 23:27:56,308 INFO L402 AbstractCegarLoop]: === Iteration 78 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:27:56,308 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:27:56,308 INFO L85 PathProgramCache]: Analyzing trace with hash -1892514339, now seen corresponding path program 75 times [2021-11-20 23:27:56,308 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:27:56,308 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [497906874] [2021-11-20 23:27:56,308 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:27:56,309 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:27:56,443 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:27:57,859 INFO L134 CoverageAnalysis]: Checked inductivity of 10622 backedges. 3540 proven. 7082 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:27:57,859 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:27:57,859 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [497906874] [2021-11-20 23:27:57,860 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [497906874] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:27:57,860 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1492060292] [2021-11-20 23:27:57,860 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-20 23:27:57,860 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:27:57,860 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:27:57,861 INFO L229 MonitoredProcess]: Starting monitored process 76 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:27:57,861 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (76)] Waiting until timeout for monitored process [2021-11-20 23:27:58,034 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-20 23:27:58,034 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:27:58,043 INFO L263 TraceCheckSpWp]: Trace formula consists of 1355 conjuncts, 123 conjunts are in the unsatisfiable core [2021-11-20 23:27:58,045 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:27:58,714 INFO L134 CoverageAnalysis]: Checked inductivity of 10622 backedges. 3660 proven. 6962 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:27:58,714 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:27:59,411 INFO L134 CoverageAnalysis]: Checked inductivity of 10622 backedges. 3660 proven. 6962 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:27:59,411 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1492060292] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:27:59,411 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1998518717] [2021-11-20 23:27:59,412 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-20 23:27:59,412 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:27:59,412 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:27:59,412 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:27:59,412 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:28:00,708 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:28:01,194 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:28:01,195 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:28:01,195 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [63, 63, 63] total 66 [2021-11-20 23:28:01,195 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [426902663] [2021-11-20 23:28:01,195 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:28:01,196 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 67 states [2021-11-20 23:28:01,196 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:28:01,196 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 67 interpolants. [2021-11-20 23:28:01,197 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2071, Invalid=3629, Unknown=0, NotChecked=0, Total=5700 [2021-11-20 23:28:01,197 INFO L87 Difference]: Start difference. First operand 367 states and 369 transitions. Second operand has 67 states, 67 states have (on average 5.776119402985074) internal successors, (387), 66 states have internal predecessors, (387), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:28:02,642 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:28:02,642 INFO L93 Difference]: Finished difference Result 384 states and 387 transitions. [2021-11-20 23:28:02,643 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 128 states. [2021-11-20 23:28:02,643 INFO L78 Accepts]: Start accepts. Automaton has has 67 states, 67 states have (on average 5.776119402985074) internal successors, (387), 66 states have internal predecessors, (387), 0 states have call successors, (0), 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 366 [2021-11-20 23:28:02,643 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:28:02,644 INFO L225 Difference]: With dead ends: 384 [2021-11-20 23:28:02,644 INFO L226 Difference]: Without dead ends: 382 [2021-11-20 23:28:02,646 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1281 GetRequests, 1143 SyntacticMatches, 1 SemanticMatches, 137 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5224 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=6234, Invalid=12948, Unknown=0, NotChecked=0, Total=19182 [2021-11-20 23:28:02,646 INFO L933 BasicCegarLoop]: 69 mSDtfsCounter, 383 mSDsluCounter, 440 mSDsCounter, 0 mSdLazyCounter, 600 mSolverCounterSat, 250 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 383 SdHoareTripleChecker+Valid, 503 SdHoareTripleChecker+Invalid, 850 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 250 IncrementalHoareTripleChecker+Valid, 600 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-20 23:28:02,646 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [383 Valid, 503 Invalid, 850 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [250 Valid, 600 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-20 23:28:02,647 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 382 states. [2021-11-20 23:28:02,683 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 382 to 375. [2021-11-20 23:28:02,684 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 375 states, 374 states have (on average 1.0080213903743316) internal successors, (377), 374 states have internal predecessors, (377), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:28:02,684 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 375 states to 375 states and 377 transitions. [2021-11-20 23:28:02,684 INFO L78 Accepts]: Start accepts. Automaton has 375 states and 377 transitions. Word has length 366 [2021-11-20 23:28:02,684 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:28:02,684 INFO L470 AbstractCegarLoop]: Abstraction has 375 states and 377 transitions. [2021-11-20 23:28:02,684 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 67 states, 67 states have (on average 5.776119402985074) internal successors, (387), 66 states have internal predecessors, (387), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:28:02,685 INFO L276 IsEmpty]: Start isEmpty. Operand 375 states and 377 transitions. [2021-11-20 23:28:02,686 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 375 [2021-11-20 23:28:02,686 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:28:02,686 INFO L514 BasicCegarLoop]: trace histogram [62, 61, 61, 61, 61, 60, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:28:02,707 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (76)] Forceful destruction successful, exit code 0 [2021-11-20 23:28:02,886 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 76 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable77 [2021-11-20 23:28:02,887 INFO L402 AbstractCegarLoop]: === Iteration 79 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:28:02,887 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:28:02,887 INFO L85 PathProgramCache]: Analyzing trace with hash 1941809859, now seen corresponding path program 76 times [2021-11-20 23:28:02,887 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:28:02,887 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1927602682] [2021-11-20 23:28:02,887 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:28:02,887 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:28:03,018 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:28:06,928 INFO L134 CoverageAnalysis]: Checked inductivity of 11102 backedges. 7262 proven. 3840 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:28:06,928 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:28:06,929 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1927602682] [2021-11-20 23:28:06,929 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1927602682] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:28:06,929 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2039246778] [2021-11-20 23:28:06,929 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-20 23:28:06,929 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:28:06,929 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:28:06,952 INFO L229 MonitoredProcess]: Starting monitored process 77 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:28:06,972 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (77)] Waiting until timeout for monitored process [2021-11-20 23:28:07,130 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:28:07,136 INFO L263 TraceCheckSpWp]: Trace formula consists of 1379 conjuncts, 124 conjunts are in the unsatisfiable core [2021-11-20 23:28:07,139 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:28:12,853 INFO L134 CoverageAnalysis]: Checked inductivity of 11102 backedges. 7440 proven. 3660 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-20 23:28:12,853 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:28:13,597 INFO L134 CoverageAnalysis]: Checked inductivity of 11102 backedges. 7440 proven. 3660 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-20 23:28:13,597 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2039246778] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:28:13,597 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [393271850] [2021-11-20 23:28:13,598 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-20 23:28:13,598 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:28:13,598 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:28:13,598 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:28:13,598 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:28:14,662 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:28:15,615 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:28:15,615 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:28:15,615 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [125, 124, 124] total 188 [2021-11-20 23:28:15,615 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1871100185] [2021-11-20 23:28:15,615 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:28:15,616 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 188 states [2021-11-20 23:28:15,616 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:28:15,617 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 188 interpolants. [2021-11-20 23:28:15,619 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8028, Invalid=30584, Unknown=0, NotChecked=0, Total=38612 [2021-11-20 23:28:15,619 INFO L87 Difference]: Start difference. First operand 375 states and 377 transitions. Second operand has 188 states, 188 states have (on average 3.3297872340425534) internal successors, (626), 188 states have internal predecessors, (626), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:28:19,290 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:28:19,290 INFO L93 Difference]: Finished difference Result 809 states and 873 transitions. [2021-11-20 23:28:19,290 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 124 states. [2021-11-20 23:28:19,290 INFO L78 Accepts]: Start accepts. Automaton has has 188 states, 188 states have (on average 3.3297872340425534) internal successors, (626), 188 states have internal predecessors, (626), 0 states have call successors, (0), 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 374 [2021-11-20 23:28:19,291 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:28:19,293 INFO L225 Difference]: With dead ends: 809 [2021-11-20 23:28:19,293 INFO L226 Difference]: Without dead ends: 560 [2021-11-20 23:28:19,296 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1306 GetRequests, 1050 SyntacticMatches, 0 SemanticMatches, 256 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15814 ImplicationChecksByTransitivity, 10.9s TimeCoverageRelationStatistics Valid=15594, Invalid=50712, Unknown=0, NotChecked=0, Total=66306 [2021-11-20 23:28:19,297 INFO L933 BasicCegarLoop]: 124 mSDtfsCounter, 817 mSDsluCounter, 1335 mSDsCounter, 0 mSdLazyCounter, 1522 mSolverCounterSat, 631 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 817 SdHoareTripleChecker+Valid, 1459 SdHoareTripleChecker+Invalid, 2153 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 631 IncrementalHoareTripleChecker+Valid, 1522 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2021-11-20 23:28:19,297 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [817 Valid, 1459 Invalid, 2153 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [631 Valid, 1522 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2021-11-20 23:28:19,297 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 560 states. [2021-11-20 23:28:19,337 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 560 to 377. [2021-11-20 23:28:19,337 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 377 states, 376 states have (on average 1.0079787234042554) internal successors, (379), 376 states have internal predecessors, (379), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:28:19,337 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 377 states to 377 states and 379 transitions. [2021-11-20 23:28:19,338 INFO L78 Accepts]: Start accepts. Automaton has 377 states and 379 transitions. Word has length 374 [2021-11-20 23:28:19,338 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:28:19,338 INFO L470 AbstractCegarLoop]: Abstraction has 377 states and 379 transitions. [2021-11-20 23:28:19,338 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 188 states, 188 states have (on average 3.3297872340425534) internal successors, (626), 188 states have internal predecessors, (626), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:28:19,338 INFO L276 IsEmpty]: Start isEmpty. Operand 377 states and 379 transitions. [2021-11-20 23:28:19,339 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 377 [2021-11-20 23:28:19,339 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:28:19,340 INFO L514 BasicCegarLoop]: trace histogram [62, 62, 61, 61, 61, 61, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:28:19,361 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (77)] Forceful destruction successful, exit code 0 [2021-11-20 23:28:19,540 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 77 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable78 [2021-11-20 23:28:19,540 INFO L402 AbstractCegarLoop]: === Iteration 80 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:28:19,540 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:28:19,540 INFO L85 PathProgramCache]: Analyzing trace with hash 605174376, now seen corresponding path program 77 times [2021-11-20 23:28:19,541 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:28:19,541 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [54146031] [2021-11-20 23:28:19,541 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:28:19,541 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:28:19,682 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:28:23,643 INFO L134 CoverageAnalysis]: Checked inductivity of 11224 backedges. 7262 proven. 3962 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:28:23,643 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:28:23,643 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [54146031] [2021-11-20 23:28:23,643 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [54146031] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:28:23,643 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1539028485] [2021-11-20 23:28:23,643 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-20 23:28:23,643 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:28:23,643 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:28:23,644 INFO L229 MonitoredProcess]: Starting monitored process 78 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:28:23,658 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (78)] Waiting until timeout for monitored process [2021-11-20 23:28:24,008 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 62 check-sat command(s) [2021-11-20 23:28:24,008 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:28:24,016 INFO L263 TraceCheckSpWp]: Trace formula consists of 1389 conjuncts, 126 conjunts are in the unsatisfiable core [2021-11-20 23:28:24,018 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:28:29,895 INFO L134 CoverageAnalysis]: Checked inductivity of 11224 backedges. 7442 proven. 3782 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:28:29,895 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:28:30,595 INFO L134 CoverageAnalysis]: Checked inductivity of 11224 backedges. 7442 proven. 3782 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:28:30,595 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1539028485] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:28:30,595 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [901652515] [2021-11-20 23:28:30,596 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-20 23:28:30,596 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:28:30,596 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:28:30,596 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:28:30,596 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:28:32,001 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:28:32,980 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:28:32,980 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:28:32,980 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [126, 126, 126] total 190 [2021-11-20 23:28:32,980 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [550374967] [2021-11-20 23:28:32,981 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:28:32,981 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 190 states [2021-11-20 23:28:32,981 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:28:32,982 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 190 interpolants. [2021-11-20 23:28:32,984 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8219, Invalid=31183, Unknown=0, NotChecked=0, Total=39402 [2021-11-20 23:28:32,984 INFO L87 Difference]: Start difference. First operand 377 states and 379 transitions. Second operand has 190 states, 190 states have (on average 3.305263157894737) internal successors, (628), 190 states have internal predecessors, (628), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:28:36,750 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:28:36,750 INFO L93 Difference]: Finished difference Result 816 states and 881 transitions. [2021-11-20 23:28:36,751 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 126 states. [2021-11-20 23:28:36,751 INFO L78 Accepts]: Start accepts. Automaton has has 190 states, 190 states have (on average 3.305263157894737) internal successors, (628), 190 states have internal predecessors, (628), 0 states have call successors, (0), 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 376 [2021-11-20 23:28:36,751 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:28:36,753 INFO L225 Difference]: With dead ends: 816 [2021-11-20 23:28:36,753 INFO L226 Difference]: Without dead ends: 565 [2021-11-20 23:28:36,756 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1314 GetRequests, 1055 SyntacticMatches, 0 SemanticMatches, 259 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16095 ImplicationChecksByTransitivity, 11.2s TimeCoverageRelationStatistics Valid=16033, Invalid=51827, Unknown=0, NotChecked=0, Total=67860 [2021-11-20 23:28:36,756 INFO L933 BasicCegarLoop]: 126 mSDtfsCounter, 778 mSDsluCounter, 1357 mSDsCounter, 0 mSdLazyCounter, 1549 mSolverCounterSat, 551 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 778 SdHoareTripleChecker+Valid, 1483 SdHoareTripleChecker+Invalid, 2100 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 551 IncrementalHoareTripleChecker+Valid, 1549 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2021-11-20 23:28:36,756 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [778 Valid, 1483 Invalid, 2100 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [551 Valid, 1549 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2021-11-20 23:28:36,757 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 565 states. [2021-11-20 23:28:36,795 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 565 to 379. [2021-11-20 23:28:36,795 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 379 states, 378 states have (on average 1.007936507936508) internal successors, (381), 378 states have internal predecessors, (381), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:28:36,795 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 379 states to 379 states and 381 transitions. [2021-11-20 23:28:36,795 INFO L78 Accepts]: Start accepts. Automaton has 379 states and 381 transitions. Word has length 376 [2021-11-20 23:28:36,796 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:28:36,796 INFO L470 AbstractCegarLoop]: Abstraction has 379 states and 381 transitions. [2021-11-20 23:28:36,796 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 190 states, 190 states have (on average 3.305263157894737) internal successors, (628), 190 states have internal predecessors, (628), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:28:36,796 INFO L276 IsEmpty]: Start isEmpty. Operand 379 states and 381 transitions. [2021-11-20 23:28:36,797 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 379 [2021-11-20 23:28:36,797 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:28:36,797 INFO L514 BasicCegarLoop]: trace histogram [63, 62, 62, 61, 61, 61, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:28:36,818 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (78)] Forceful destruction successful, exit code 0 [2021-11-20 23:28:36,998 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable79,78 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:28:36,998 INFO L402 AbstractCegarLoop]: === Iteration 81 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:28:36,998 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:28:36,998 INFO L85 PathProgramCache]: Analyzing trace with hash 293696717, now seen corresponding path program 78 times [2021-11-20 23:28:36,998 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:28:36,998 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1170417596] [2021-11-20 23:28:36,999 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:28:36,999 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:28:37,141 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:28:38,621 INFO L134 CoverageAnalysis]: Checked inductivity of 11348 backedges. 3782 proven. 7566 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:28:38,621 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:28:38,621 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1170417596] [2021-11-20 23:28:38,621 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1170417596] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:28:38,621 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2023237543] [2021-11-20 23:28:38,621 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-20 23:28:38,621 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:28:38,621 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:28:38,622 INFO L229 MonitoredProcess]: Starting monitored process 79 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:28:38,623 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (79)] Waiting until timeout for monitored process [2021-11-20 23:28:38,800 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-20 23:28:38,800 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:28:38,809 INFO L263 TraceCheckSpWp]: Trace formula consists of 1399 conjuncts, 127 conjunts are in the unsatisfiable core [2021-11-20 23:28:38,812 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:28:39,503 INFO L134 CoverageAnalysis]: Checked inductivity of 11348 backedges. 3906 proven. 7442 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:28:39,503 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:28:40,220 INFO L134 CoverageAnalysis]: Checked inductivity of 11348 backedges. 3906 proven. 7442 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:28:40,221 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2023237543] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:28:40,221 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1486844105] [2021-11-20 23:28:40,221 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-20 23:28:40,221 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:28:40,222 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:28:40,222 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:28:40,222 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:28:41,330 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:28:41,818 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:28:41,818 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:28:41,818 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [65, 65, 65] total 68 [2021-11-20 23:28:41,818 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [719566358] [2021-11-20 23:28:41,818 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:28:41,819 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 69 states [2021-11-20 23:28:41,819 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:28:41,819 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 69 interpolants. [2021-11-20 23:28:41,820 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2200, Invalid=3806, Unknown=0, NotChecked=0, Total=6006 [2021-11-20 23:28:41,820 INFO L87 Difference]: Start difference. First operand 379 states and 381 transitions. Second operand has 69 states, 69 states have (on average 5.782608695652174) internal successors, (399), 68 states have internal predecessors, (399), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:28:43,351 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:28:43,352 INFO L93 Difference]: Finished difference Result 396 states and 399 transitions. [2021-11-20 23:28:43,352 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 132 states. [2021-11-20 23:28:43,352 INFO L78 Accepts]: Start accepts. Automaton has has 69 states, 69 states have (on average 5.782608695652174) internal successors, (399), 68 states have internal predecessors, (399), 0 states have call successors, (0), 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 378 [2021-11-20 23:28:43,352 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:28:43,354 INFO L225 Difference]: With dead ends: 396 [2021-11-20 23:28:43,354 INFO L226 Difference]: Without dead ends: 394 [2021-11-20 23:28:43,355 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1323 GetRequests, 1181 SyntacticMatches, 1 SemanticMatches, 141 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5520 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=6625, Invalid=13681, Unknown=0, NotChecked=0, Total=20306 [2021-11-20 23:28:43,355 INFO L933 BasicCegarLoop]: 71 mSDtfsCounter, 331 mSDsluCounter, 538 mSDsCounter, 0 mSdLazyCounter, 705 mSolverCounterSat, 257 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 331 SdHoareTripleChecker+Valid, 602 SdHoareTripleChecker+Invalid, 962 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 257 IncrementalHoareTripleChecker+Valid, 705 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-20 23:28:43,356 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [331 Valid, 602 Invalid, 962 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [257 Valid, 705 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-20 23:28:43,356 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 394 states. [2021-11-20 23:28:43,395 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 394 to 387. [2021-11-20 23:28:43,395 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 387 states, 386 states have (on average 1.0077720207253886) internal successors, (389), 386 states have internal predecessors, (389), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:28:43,396 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 387 states to 387 states and 389 transitions. [2021-11-20 23:28:43,396 INFO L78 Accepts]: Start accepts. Automaton has 387 states and 389 transitions. Word has length 378 [2021-11-20 23:28:43,396 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:28:43,396 INFO L470 AbstractCegarLoop]: Abstraction has 387 states and 389 transitions. [2021-11-20 23:28:43,396 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 69 states, 69 states have (on average 5.782608695652174) internal successors, (399), 68 states have internal predecessors, (399), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:28:43,396 INFO L276 IsEmpty]: Start isEmpty. Operand 387 states and 389 transitions. [2021-11-20 23:28:43,398 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 387 [2021-11-20 23:28:43,398 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:28:43,398 INFO L514 BasicCegarLoop]: trace histogram [64, 63, 63, 63, 63, 62, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:28:43,419 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (79)] Forceful destruction successful, exit code 0 [2021-11-20 23:28:43,598 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable80,79 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:28:43,598 INFO L402 AbstractCegarLoop]: === Iteration 82 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:28:43,599 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:28:43,599 INFO L85 PathProgramCache]: Analyzing trace with hash 1734781363, now seen corresponding path program 79 times [2021-11-20 23:28:43,599 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:28:43,599 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [706787557] [2021-11-20 23:28:43,599 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:28:43,599 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:28:43,752 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:28:47,897 INFO L134 CoverageAnalysis]: Checked inductivity of 11844 backedges. 7752 proven. 4092 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:28:47,897 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:28:47,897 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [706787557] [2021-11-20 23:28:47,897 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [706787557] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:28:47,897 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1357174026] [2021-11-20 23:28:47,897 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-20 23:28:47,897 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:28:47,897 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:28:47,898 INFO L229 MonitoredProcess]: Starting monitored process 80 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:28:47,899 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (80)] Waiting until timeout for monitored process [2021-11-20 23:28:48,065 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:28:48,071 INFO L263 TraceCheckSpWp]: Trace formula consists of 1423 conjuncts, 128 conjunts are in the unsatisfiable core [2021-11-20 23:28:48,074 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:28:54,124 INFO L134 CoverageAnalysis]: Checked inductivity of 11844 backedges. 7936 proven. 3906 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-20 23:28:54,124 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:28:54,884 INFO L134 CoverageAnalysis]: Checked inductivity of 11844 backedges. 7936 proven. 3906 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-20 23:28:54,885 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1357174026] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:28:54,885 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2077186582] [2021-11-20 23:28:54,885 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-20 23:28:54,885 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:28:54,886 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:28:54,886 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:28:54,886 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:28:56,196 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:28:57,235 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:28:57,235 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:28:57,235 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [129, 128, 128] total 194 [2021-11-20 23:28:57,236 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1075857120] [2021-11-20 23:28:57,236 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:28:57,236 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 194 states [2021-11-20 23:28:57,236 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:28:57,238 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 194 interpolants. [2021-11-20 23:28:57,239 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8542, Invalid=32464, Unknown=0, NotChecked=0, Total=41006 [2021-11-20 23:28:57,239 INFO L87 Difference]: Start difference. First operand 387 states and 389 transitions. Second operand has 194 states, 194 states have (on average 3.329896907216495) internal successors, (646), 194 states have internal predecessors, (646), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:29:01,257 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:29:01,257 INFO L93 Difference]: Finished difference Result 835 states and 901 transitions. [2021-11-20 23:29:01,257 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 128 states. [2021-11-20 23:29:01,257 INFO L78 Accepts]: Start accepts. Automaton has has 194 states, 194 states have (on average 3.329896907216495) internal successors, (646), 194 states have internal predecessors, (646), 0 states have call successors, (0), 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 386 [2021-11-20 23:29:01,258 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:29:01,260 INFO L225 Difference]: With dead ends: 835 [2021-11-20 23:29:01,260 INFO L226 Difference]: Without dead ends: 578 [2021-11-20 23:29:01,264 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1348 GetRequests, 1084 SyntacticMatches, 0 SemanticMatches, 264 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16773 ImplicationChecksByTransitivity, 11.6s TimeCoverageRelationStatistics Valid=16608, Invalid=53882, Unknown=0, NotChecked=0, Total=70490 [2021-11-20 23:29:01,264 INFO L933 BasicCegarLoop]: 128 mSDtfsCounter, 692 mSDsluCounter, 1562 mSDsCounter, 0 mSdLazyCounter, 1768 mSolverCounterSat, 703 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 692 SdHoareTripleChecker+Valid, 1690 SdHoareTripleChecker+Invalid, 2471 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 703 IncrementalHoareTripleChecker+Valid, 1768 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2021-11-20 23:29:01,264 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [692 Valid, 1690 Invalid, 2471 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [703 Valid, 1768 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2021-11-20 23:29:01,265 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 578 states. [2021-11-20 23:29:01,306 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 578 to 389. [2021-11-20 23:29:01,306 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 389 states, 388 states have (on average 1.0077319587628866) internal successors, (391), 388 states have internal predecessors, (391), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:29:01,306 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 389 states to 389 states and 391 transitions. [2021-11-20 23:29:01,306 INFO L78 Accepts]: Start accepts. Automaton has 389 states and 391 transitions. Word has length 386 [2021-11-20 23:29:01,307 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:29:01,307 INFO L470 AbstractCegarLoop]: Abstraction has 389 states and 391 transitions. [2021-11-20 23:29:01,307 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 194 states, 194 states have (on average 3.329896907216495) internal successors, (646), 194 states have internal predecessors, (646), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:29:01,307 INFO L276 IsEmpty]: Start isEmpty. Operand 389 states and 391 transitions. [2021-11-20 23:29:01,308 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 389 [2021-11-20 23:29:01,308 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:29:01,308 INFO L514 BasicCegarLoop]: trace histogram [64, 64, 63, 63, 63, 63, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:29:01,329 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (80)] Forceful destruction successful, exit code 0 [2021-11-20 23:29:01,509 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 80 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable81 [2021-11-20 23:29:01,509 INFO L402 AbstractCegarLoop]: === Iteration 83 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:29:01,509 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:29:01,509 INFO L85 PathProgramCache]: Analyzing trace with hash 617605592, now seen corresponding path program 80 times [2021-11-20 23:29:01,509 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:29:01,509 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1042509508] [2021-11-20 23:29:01,510 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:29:01,510 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:29:01,682 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:29:05,882 INFO L134 CoverageAnalysis]: Checked inductivity of 11970 backedges. 7752 proven. 4218 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:29:05,882 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:29:05,882 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1042509508] [2021-11-20 23:29:05,882 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1042509508] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:29:05,882 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1594967096] [2021-11-20 23:29:05,882 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-20 23:29:05,882 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:29:05,882 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:29:05,883 INFO L229 MonitoredProcess]: Starting monitored process 81 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:29:05,884 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (81)] Waiting until timeout for monitored process [2021-11-20 23:29:06,239 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 64 check-sat command(s) [2021-11-20 23:29:06,239 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:29:06,247 INFO L263 TraceCheckSpWp]: Trace formula consists of 1433 conjuncts, 130 conjunts are in the unsatisfiable core [2021-11-20 23:29:06,250 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:29:12,402 INFO L134 CoverageAnalysis]: Checked inductivity of 11970 backedges. 7938 proven. 4032 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:29:12,402 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:29:13,136 INFO L134 CoverageAnalysis]: Checked inductivity of 11970 backedges. 7938 proven. 4032 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:29:13,136 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1594967096] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:29:13,136 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1306900720] [2021-11-20 23:29:13,137 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-20 23:29:13,137 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:29:13,137 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:29:13,137 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:29:13,137 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:29:14,573 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:29:15,600 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:29:15,600 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:29:15,601 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [130, 130, 130] total 196 [2021-11-20 23:29:15,601 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [542760410] [2021-11-20 23:29:15,601 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:29:15,602 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 196 states [2021-11-20 23:29:15,602 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:29:15,603 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 196 interpolants. [2021-11-20 23:29:15,605 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8739, Invalid=33081, Unknown=0, NotChecked=0, Total=41820 [2021-11-20 23:29:15,605 INFO L87 Difference]: Start difference. First operand 389 states and 391 transitions. Second operand has 196 states, 196 states have (on average 3.306122448979592) internal successors, (648), 196 states have internal predecessors, (648), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:29:19,939 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:29:19,940 INFO L93 Difference]: Finished difference Result 842 states and 909 transitions. [2021-11-20 23:29:19,940 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 130 states. [2021-11-20 23:29:19,940 INFO L78 Accepts]: Start accepts. Automaton has has 196 states, 196 states have (on average 3.306122448979592) internal successors, (648), 196 states have internal predecessors, (648), 0 states have call successors, (0), 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 388 [2021-11-20 23:29:19,940 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:29:19,942 INFO L225 Difference]: With dead ends: 842 [2021-11-20 23:29:19,942 INFO L226 Difference]: Without dead ends: 583 [2021-11-20 23:29:19,946 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1356 GetRequests, 1089 SyntacticMatches, 0 SemanticMatches, 267 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17062 ImplicationChecksByTransitivity, 11.8s TimeCoverageRelationStatistics Valid=17061, Invalid=55031, Unknown=0, NotChecked=0, Total=72092 [2021-11-20 23:29:19,947 INFO L933 BasicCegarLoop]: 130 mSDtfsCounter, 775 mSDsluCounter, 1494 mSDsCounter, 0 mSdLazyCounter, 1694 mSolverCounterSat, 944 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 775 SdHoareTripleChecker+Valid, 1624 SdHoareTripleChecker+Invalid, 2638 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 944 IncrementalHoareTripleChecker+Valid, 1694 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2021-11-20 23:29:19,947 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [775 Valid, 1624 Invalid, 2638 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [944 Valid, 1694 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2021-11-20 23:29:19,948 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 583 states. [2021-11-20 23:29:19,997 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 583 to 391. [2021-11-20 23:29:19,998 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 391 states, 390 states have (on average 1.0076923076923077) internal successors, (393), 390 states have internal predecessors, (393), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:29:19,998 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 391 states to 391 states and 393 transitions. [2021-11-20 23:29:19,999 INFO L78 Accepts]: Start accepts. Automaton has 391 states and 393 transitions. Word has length 388 [2021-11-20 23:29:19,999 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:29:19,999 INFO L470 AbstractCegarLoop]: Abstraction has 391 states and 393 transitions. [2021-11-20 23:29:19,999 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 196 states, 196 states have (on average 3.306122448979592) internal successors, (648), 196 states have internal predecessors, (648), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:29:19,999 INFO L276 IsEmpty]: Start isEmpty. Operand 391 states and 393 transitions. [2021-11-20 23:29:20,002 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 391 [2021-11-20 23:29:20,002 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:29:20,002 INFO L514 BasicCegarLoop]: trace histogram [65, 64, 64, 63, 63, 63, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:29:20,030 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (81)] Forceful destruction successful, exit code 0 [2021-11-20 23:29:20,218 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable82,81 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:29:20,219 INFO L402 AbstractCegarLoop]: === Iteration 84 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:29:20,219 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:29:20,219 INFO L85 PathProgramCache]: Analyzing trace with hash 753513661, now seen corresponding path program 81 times [2021-11-20 23:29:20,219 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:29:20,219 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [12853868] [2021-11-20 23:29:20,219 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:29:20,219 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:29:20,400 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:29:21,984 INFO L134 CoverageAnalysis]: Checked inductivity of 12098 backedges. 4032 proven. 8066 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:29:21,985 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:29:21,985 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [12853868] [2021-11-20 23:29:21,985 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [12853868] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:29:21,985 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1893064612] [2021-11-20 23:29:21,985 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-20 23:29:21,985 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:29:21,985 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:29:21,986 INFO L229 MonitoredProcess]: Starting monitored process 82 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:29:21,987 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (82)] Waiting until timeout for monitored process [2021-11-20 23:29:22,168 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-20 23:29:22,168 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:29:22,177 INFO L263 TraceCheckSpWp]: Trace formula consists of 1443 conjuncts, 131 conjunts are in the unsatisfiable core [2021-11-20 23:29:22,180 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:29:22,898 INFO L134 CoverageAnalysis]: Checked inductivity of 12098 backedges. 4160 proven. 7938 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:29:22,898 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:29:23,656 INFO L134 CoverageAnalysis]: Checked inductivity of 12098 backedges. 4160 proven. 7938 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:29:23,657 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1893064612] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:29:23,657 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1857159367] [2021-11-20 23:29:23,658 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-20 23:29:23,658 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:29:23,658 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:29:23,658 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:29:23,659 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:29:25,210 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:29:25,738 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:29:25,738 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:29:25,738 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [67, 67, 67] total 70 [2021-11-20 23:29:25,738 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1873699270] [2021-11-20 23:29:25,738 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:29:25,739 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 71 states [2021-11-20 23:29:25,739 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:29:25,740 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 71 interpolants. [2021-11-20 23:29:25,740 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2333, Invalid=3987, Unknown=0, NotChecked=0, Total=6320 [2021-11-20 23:29:25,740 INFO L87 Difference]: Start difference. First operand 391 states and 393 transitions. Second operand has 71 states, 71 states have (on average 5.788732394366197) internal successors, (411), 70 states have internal predecessors, (411), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:29:27,388 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:29:27,388 INFO L93 Difference]: Finished difference Result 408 states and 411 transitions. [2021-11-20 23:29:27,388 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 136 states. [2021-11-20 23:29:27,388 INFO L78 Accepts]: Start accepts. Automaton has has 71 states, 71 states have (on average 5.788732394366197) internal successors, (411), 70 states have internal predecessors, (411), 0 states have call successors, (0), 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 390 [2021-11-20 23:29:27,389 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:29:27,390 INFO L225 Difference]: With dead ends: 408 [2021-11-20 23:29:27,390 INFO L226 Difference]: Without dead ends: 406 [2021-11-20 23:29:27,392 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1365 GetRequests, 1219 SyntacticMatches, 1 SemanticMatches, 145 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5824 ImplicationChecksByTransitivity, 3.1s TimeCoverageRelationStatistics Valid=7028, Invalid=14434, Unknown=0, NotChecked=0, Total=21462 [2021-11-20 23:29:27,392 INFO L933 BasicCegarLoop]: 73 mSDtfsCounter, 404 mSDsluCounter, 475 mSDsCounter, 0 mSdLazyCounter, 646 mSolverCounterSat, 266 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 404 SdHoareTripleChecker+Valid, 541 SdHoareTripleChecker+Invalid, 912 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 266 IncrementalHoareTripleChecker+Valid, 646 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-20 23:29:27,392 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [404 Valid, 541 Invalid, 912 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [266 Valid, 646 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-20 23:29:27,393 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 406 states. [2021-11-20 23:29:27,436 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 406 to 399. [2021-11-20 23:29:27,436 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 399 states, 398 states have (on average 1.0075376884422111) internal successors, (401), 398 states have internal predecessors, (401), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:29:27,436 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 399 states to 399 states and 401 transitions. [2021-11-20 23:29:27,437 INFO L78 Accepts]: Start accepts. Automaton has 399 states and 401 transitions. Word has length 390 [2021-11-20 23:29:27,437 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:29:27,437 INFO L470 AbstractCegarLoop]: Abstraction has 399 states and 401 transitions. [2021-11-20 23:29:27,437 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 71 states, 71 states have (on average 5.788732394366197) internal successors, (411), 70 states have internal predecessors, (411), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:29:27,437 INFO L276 IsEmpty]: Start isEmpty. Operand 399 states and 401 transitions. [2021-11-20 23:29:27,438 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 399 [2021-11-20 23:29:27,438 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:29:27,439 INFO L514 BasicCegarLoop]: trace histogram [66, 65, 65, 65, 65, 64, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:29:27,460 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (82)] Forceful destruction successful, exit code 0 [2021-11-20 23:29:27,639 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable83,82 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:29:27,639 INFO L402 AbstractCegarLoop]: === Iteration 85 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:29:27,640 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:29:27,640 INFO L85 PathProgramCache]: Analyzing trace with hash 1917319587, now seen corresponding path program 82 times [2021-11-20 23:29:27,640 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:29:27,640 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1019984182] [2021-11-20 23:29:27,640 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:29:27,640 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:29:27,811 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:29:32,215 INFO L134 CoverageAnalysis]: Checked inductivity of 12610 backedges. 8258 proven. 4352 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:29:32,215 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:29:32,215 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1019984182] [2021-11-20 23:29:32,215 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1019984182] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:29:32,215 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1683114103] [2021-11-20 23:29:32,215 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2021-11-20 23:29:32,215 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:29:32,215 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:29:32,216 INFO L229 MonitoredProcess]: Starting monitored process 83 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:29:32,217 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (83)] Waiting until timeout for monitored process [2021-11-20 23:29:32,389 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:29:32,396 INFO L263 TraceCheckSpWp]: Trace formula consists of 1467 conjuncts, 132 conjunts are in the unsatisfiable core [2021-11-20 23:29:32,399 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:29:38,890 INFO L134 CoverageAnalysis]: Checked inductivity of 12610 backedges. 8448 proven. 4160 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-20 23:29:38,890 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:29:39,678 INFO L134 CoverageAnalysis]: Checked inductivity of 12610 backedges. 8448 proven. 4160 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-20 23:29:39,679 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1683114103] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:29:39,679 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1984868041] [2021-11-20 23:29:39,679 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-20 23:29:39,679 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:29:39,680 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:29:39,680 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:29:39,680 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:29:41,212 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:29:42,283 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:29:42,283 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:29:42,283 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [133, 132, 132] total 200 [2021-11-20 23:29:42,283 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1243518466] [2021-11-20 23:29:42,284 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:29:42,284 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 200 states [2021-11-20 23:29:42,284 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:29:42,286 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 200 interpolants. [2021-11-20 23:29:42,287 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9072, Invalid=34400, Unknown=0, NotChecked=0, Total=43472 [2021-11-20 23:29:42,287 INFO L87 Difference]: Start difference. First operand 399 states and 401 transitions. Second operand has 200 states, 200 states have (on average 3.33) internal successors, (666), 200 states have internal predecessors, (666), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:29:46,639 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:29:46,639 INFO L93 Difference]: Finished difference Result 861 states and 929 transitions. [2021-11-20 23:29:46,640 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 132 states. [2021-11-20 23:29:46,640 INFO L78 Accepts]: Start accepts. Automaton has has 200 states, 200 states have (on average 3.33) internal successors, (666), 200 states have internal predecessors, (666), 0 states have call successors, (0), 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 398 [2021-11-20 23:29:46,640 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:29:46,642 INFO L225 Difference]: With dead ends: 861 [2021-11-20 23:29:46,642 INFO L226 Difference]: Without dead ends: 596 [2021-11-20 23:29:46,647 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1390 GetRequests, 1118 SyntacticMatches, 0 SemanticMatches, 272 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17760 ImplicationChecksByTransitivity, 12.4s TimeCoverageRelationStatistics Valid=17654, Invalid=57148, Unknown=0, NotChecked=0, Total=74802 [2021-11-20 23:29:46,647 INFO L933 BasicCegarLoop]: 132 mSDtfsCounter, 747 mSDsluCounter, 1409 mSDsCounter, 0 mSdLazyCounter, 1609 mSolverCounterSat, 807 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 747 SdHoareTripleChecker+Valid, 1541 SdHoareTripleChecker+Invalid, 2416 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 807 IncrementalHoareTripleChecker+Valid, 1609 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2021-11-20 23:29:46,647 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [747 Valid, 1541 Invalid, 2416 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [807 Valid, 1609 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2021-11-20 23:29:46,648 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 596 states. [2021-11-20 23:29:46,700 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 596 to 401. [2021-11-20 23:29:46,701 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 401 states, 400 states have (on average 1.0075) internal successors, (403), 400 states have internal predecessors, (403), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:29:46,701 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 401 states to 401 states and 403 transitions. [2021-11-20 23:29:46,701 INFO L78 Accepts]: Start accepts. Automaton has 401 states and 403 transitions. Word has length 398 [2021-11-20 23:29:46,701 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:29:46,701 INFO L470 AbstractCegarLoop]: Abstraction has 401 states and 403 transitions. [2021-11-20 23:29:46,702 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 200 states, 200 states have (on average 3.33) internal successors, (666), 200 states have internal predecessors, (666), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:29:46,702 INFO L276 IsEmpty]: Start isEmpty. Operand 401 states and 403 transitions. [2021-11-20 23:29:46,703 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 401 [2021-11-20 23:29:46,704 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:29:46,704 INFO L514 BasicCegarLoop]: trace histogram [66, 66, 65, 65, 65, 65, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:29:46,731 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (83)] Forceful destruction successful, exit code 0 [2021-11-20 23:29:46,904 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable84,83 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:29:46,904 INFO L402 AbstractCegarLoop]: === Iteration 86 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:29:46,905 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:29:46,905 INFO L85 PathProgramCache]: Analyzing trace with hash -1799280056, now seen corresponding path program 83 times [2021-11-20 23:29:46,905 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:29:46,905 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [275855320] [2021-11-20 23:29:46,905 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:29:46,905 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:29:47,072 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:29:51,581 INFO L134 CoverageAnalysis]: Checked inductivity of 12740 backedges. 8258 proven. 4482 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:29:51,581 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:29:51,581 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [275855320] [2021-11-20 23:29:51,581 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [275855320] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:29:51,582 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1041497620] [2021-11-20 23:29:51,582 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-20 23:29:51,582 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:29:51,582 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:29:51,583 INFO L229 MonitoredProcess]: Starting monitored process 84 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:29:51,583 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (84)] Waiting until timeout for monitored process [2021-11-20 23:29:52,021 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 66 check-sat command(s) [2021-11-20 23:29:52,021 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:29:52,031 INFO L263 TraceCheckSpWp]: Trace formula consists of 1477 conjuncts, 134 conjunts are in the unsatisfiable core [2021-11-20 23:29:52,034 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:29:58,694 INFO L134 CoverageAnalysis]: Checked inductivity of 12740 backedges. 8450 proven. 4290 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:29:58,694 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:29:59,499 INFO L134 CoverageAnalysis]: Checked inductivity of 12740 backedges. 8450 proven. 4290 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:29:59,499 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1041497620] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:29:59,499 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1926778029] [2021-11-20 23:29:59,500 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-20 23:29:59,500 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:29:59,500 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:29:59,500 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:29:59,501 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:30:01,276 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:30:02,368 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:30:02,368 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:30:02,368 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [134, 134, 134] total 202 [2021-11-20 23:30:02,368 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1651900677] [2021-11-20 23:30:02,368 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:30:02,369 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 202 states [2021-11-20 23:30:02,369 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:30:02,371 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 202 interpolants. [2021-11-20 23:30:02,374 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9275, Invalid=35035, Unknown=0, NotChecked=0, Total=44310 [2021-11-20 23:30:02,374 INFO L87 Difference]: Start difference. First operand 401 states and 403 transitions. Second operand has 202 states, 202 states have (on average 3.3069306930693068) internal successors, (668), 202 states have internal predecessors, (668), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:30:07,392 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-20 23:30:07,392 INFO L93 Difference]: Finished difference Result 868 states and 937 transitions. [2021-11-20 23:30:07,392 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 134 states. [2021-11-20 23:30:07,392 INFO L78 Accepts]: Start accepts. Automaton has has 202 states, 202 states have (on average 3.3069306930693068) internal successors, (668), 202 states have internal predecessors, (668), 0 states have call successors, (0), 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 400 [2021-11-20 23:30:07,393 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-20 23:30:07,395 INFO L225 Difference]: With dead ends: 868 [2021-11-20 23:30:07,395 INFO L226 Difference]: Without dead ends: 601 [2021-11-20 23:30:07,400 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 1398 GetRequests, 1123 SyntacticMatches, 0 SemanticMatches, 275 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 18057 ImplicationChecksByTransitivity, 12.8s TimeCoverageRelationStatistics Valid=18121, Invalid=58331, Unknown=0, NotChecked=0, Total=76452 [2021-11-20 23:30:07,401 INFO L933 BasicCegarLoop]: 134 mSDtfsCounter, 635 mSDsluCounter, 1709 mSDsCounter, 0 mSdLazyCounter, 1910 mSolverCounterSat, 422 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 635 SdHoareTripleChecker+Valid, 1843 SdHoareTripleChecker+Invalid, 2332 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 422 IncrementalHoareTripleChecker+Valid, 1910 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2021-11-20 23:30:07,401 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [635 Valid, 1843 Invalid, 2332 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [422 Valid, 1910 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2021-11-20 23:30:07,402 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 601 states. [2021-11-20 23:30:07,455 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 601 to 403. [2021-11-20 23:30:07,455 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 403 states, 402 states have (on average 1.007462686567164) internal successors, (405), 402 states have internal predecessors, (405), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:30:07,456 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 403 states to 403 states and 405 transitions. [2021-11-20 23:30:07,456 INFO L78 Accepts]: Start accepts. Automaton has 403 states and 405 transitions. Word has length 400 [2021-11-20 23:30:07,456 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-20 23:30:07,456 INFO L470 AbstractCegarLoop]: Abstraction has 403 states and 405 transitions. [2021-11-20 23:30:07,457 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 202 states, 202 states have (on average 3.3069306930693068) internal successors, (668), 202 states have internal predecessors, (668), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-20 23:30:07,457 INFO L276 IsEmpty]: Start isEmpty. Operand 403 states and 405 transitions. [2021-11-20 23:30:07,458 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 403 [2021-11-20 23:30:07,459 INFO L506 BasicCegarLoop]: Found error trace [2021-11-20 23:30:07,459 INFO L514 BasicCegarLoop]: trace histogram [67, 66, 66, 65, 65, 65, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-20 23:30:07,484 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (84)] Forceful destruction successful, exit code 0 [2021-11-20 23:30:07,659 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 84 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable85 [2021-11-20 23:30:07,659 INFO L402 AbstractCegarLoop]: === Iteration 87 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-20 23:30:07,660 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-20 23:30:07,660 INFO L85 PathProgramCache]: Analyzing trace with hash -38746707, now seen corresponding path program 84 times [2021-11-20 23:30:07,660 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-20 23:30:07,660 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [210383320] [2021-11-20 23:30:07,660 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-20 23:30:07,660 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-20 23:30:07,845 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-20 23:30:09,555 INFO L134 CoverageAnalysis]: Checked inductivity of 12872 backedges. 4290 proven. 8582 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:30:09,556 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-20 23:30:09,556 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [210383320] [2021-11-20 23:30:09,556 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [210383320] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-20 23:30:09,556 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [493071572] [2021-11-20 23:30:09,556 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-20 23:30:09,557 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-20 23:30:09,557 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-20 23:30:09,558 INFO L229 MonitoredProcess]: Starting monitored process 85 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-20 23:30:09,559 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9e3326fe-9f8a-4ce8-9be5-76eb0bae9f8a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (85)] Waiting until timeout for monitored process [2021-11-20 23:30:09,749 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-20 23:30:09,749 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-20 23:30:09,758 INFO L263 TraceCheckSpWp]: Trace formula consists of 1487 conjuncts, 135 conjunts are in the unsatisfiable core [2021-11-20 23:30:09,761 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-20 23:30:10,529 INFO L134 CoverageAnalysis]: Checked inductivity of 12872 backedges. 4422 proven. 8450 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:30:10,529 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-20 23:30:11,335 INFO L134 CoverageAnalysis]: Checked inductivity of 12872 backedges. 4422 proven. 8450 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-20 23:30:11,336 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [493071572] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-20 23:30:11,336 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2006563476] [2021-11-20 23:30:11,337 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2021-11-20 23:30:11,337 INFO L166 IcfgInterpreter]: Building call graph [2021-11-20 23:30:11,337 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-20 23:30:11,337 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-20 23:30:11,337 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-20 23:30:12,869 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-20 23:30:13,406 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-20 23:30:13,407 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-20 23:30:13,407 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [69, 69, 69] total 72 [2021-11-20 23:30:13,407 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1899397041] [2021-11-20 23:30:13,407 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-20 23:30:13,408 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 73 states [2021-11-20 23:30:13,408 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-20 23:30:13,409 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 73 interpolants. [2021-11-20 23:30:13,409 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2470, Invalid=4172, Unknown=0, NotChecked=0, Total=6642 [2021-11-20 23:30:13,409 INFO L87 Difference]: Start difference. First operand 403 states and 405 transitions. Second operand has 73 states, 73 states have (on average 5.794520547945205) internal successors, (423), 72 states have internal predecessors, (423), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0)