./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/combinations/pc_sfifo_1.cil-2+token_ring.05.cil-2.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version aef121e0 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_094b7207-5913-40c5-a95b-0c93f54561b9/bin/utaipan-EQgc7hIp5V/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_094b7207-5913-40c5-a95b-0c93f54561b9/bin/utaipan-EQgc7hIp5V/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_094b7207-5913-40c5-a95b-0c93f54561b9/bin/utaipan-EQgc7hIp5V/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_094b7207-5913-40c5-a95b-0c93f54561b9/bin/utaipan-EQgc7hIp5V/config/TaipanReach.xml -i ../../sv-benchmarks/c/combinations/pc_sfifo_1.cil-2+token_ring.05.cil-2.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_094b7207-5913-40c5-a95b-0c93f54561b9/bin/utaipan-EQgc7hIp5V/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_094b7207-5913-40c5-a95b-0c93f54561b9/bin/utaipan-EQgc7hIp5V --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 2468c605d5c29b15a54525a5c6944fa0a2b4d36426cacd5fefa10555cb2b8a7a --- Real Ultimate output --- This is Ultimate 0.2.1-dev-aef121e [2021-11-23 03:07:28,189 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-23 03:07:28,193 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-23 03:07:28,279 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-23 03:07:28,280 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-23 03:07:28,285 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-23 03:07:28,286 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-23 03:07:28,290 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-23 03:07:28,293 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-23 03:07:28,301 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-23 03:07:28,302 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-23 03:07:28,304 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-23 03:07:28,304 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-23 03:07:28,305 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-23 03:07:28,307 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-23 03:07:28,308 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-23 03:07:28,310 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-23 03:07:28,326 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-23 03:07:28,328 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-23 03:07:28,330 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-23 03:07:28,332 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-23 03:07:28,334 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-23 03:07:28,336 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-23 03:07:28,337 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-23 03:07:28,341 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-23 03:07:28,342 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-23 03:07:28,342 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-23 03:07:28,344 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-23 03:07:28,345 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-23 03:07:28,346 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-23 03:07:28,346 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-23 03:07:28,347 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-23 03:07:28,348 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-23 03:07:28,350 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-23 03:07:28,351 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-23 03:07:28,351 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-23 03:07:28,352 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-23 03:07:28,353 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-23 03:07:28,353 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-23 03:07:28,355 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-23 03:07:28,356 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-23 03:07:28,357 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_094b7207-5913-40c5-a95b-0c93f54561b9/bin/utaipan-EQgc7hIp5V/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-23 03:07:28,384 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-23 03:07:28,384 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-23 03:07:28,385 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-23 03:07:28,385 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-23 03:07:28,386 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-23 03:07:28,387 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-23 03:07:28,387 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-23 03:07:28,388 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-23 03:07:28,388 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-23 03:07:28,388 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-23 03:07:28,389 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-23 03:07:28,389 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-23 03:07:28,390 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-23 03:07:28,390 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-23 03:07:28,390 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-23 03:07:28,391 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-23 03:07:28,391 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-23 03:07:28,392 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-23 03:07:28,393 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-23 03:07:28,393 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-23 03:07:28,394 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-23 03:07:28,394 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-23 03:07:28,394 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-23 03:07:28,394 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-23 03:07:28,395 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-23 03:07:28,395 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-23 03:07:28,395 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-23 03:07:28,395 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-23 03:07:28,396 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-23 03:07:28,396 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-23 03:07:28,396 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-23 03:07:28,396 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-23 03:07:28,397 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 03:07:28,397 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-23 03:07:28,397 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-23 03:07:28,397 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-23 03:07:28,398 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-23 03:07:28,398 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-23 03:07:28,398 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-23 03:07:28,398 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-23 03:07:28,399 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-23 03:07:28,399 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_094b7207-5913-40c5-a95b-0c93f54561b9/bin/utaipan-EQgc7hIp5V/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_094b7207-5913-40c5-a95b-0c93f54561b9/bin/utaipan-EQgc7hIp5V Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 2468c605d5c29b15a54525a5c6944fa0a2b4d36426cacd5fefa10555cb2b8a7a [2021-11-23 03:07:28,643 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-23 03:07:28,666 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-23 03:07:28,669 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-23 03:07:28,670 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-23 03:07:28,671 INFO L275 PluginConnector]: CDTParser initialized [2021-11-23 03:07:28,673 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_094b7207-5913-40c5-a95b-0c93f54561b9/bin/utaipan-EQgc7hIp5V/../../sv-benchmarks/c/combinations/pc_sfifo_1.cil-2+token_ring.05.cil-2.c [2021-11-23 03:07:28,752 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_094b7207-5913-40c5-a95b-0c93f54561b9/bin/utaipan-EQgc7hIp5V/data/afe4a700e/60b49ece2e4549de8366d0f5568ec538/FLAG79c1eed2b [2021-11-23 03:07:29,390 INFO L306 CDTParser]: Found 1 translation units. [2021-11-23 03:07:29,390 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_094b7207-5913-40c5-a95b-0c93f54561b9/sv-benchmarks/c/combinations/pc_sfifo_1.cil-2+token_ring.05.cil-2.c [2021-11-23 03:07:29,414 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_094b7207-5913-40c5-a95b-0c93f54561b9/bin/utaipan-EQgc7hIp5V/data/afe4a700e/60b49ece2e4549de8366d0f5568ec538/FLAG79c1eed2b [2021-11-23 03:07:29,710 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_094b7207-5913-40c5-a95b-0c93f54561b9/bin/utaipan-EQgc7hIp5V/data/afe4a700e/60b49ece2e4549de8366d0f5568ec538 [2021-11-23 03:07:29,713 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-23 03:07:29,714 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-23 03:07:29,716 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-23 03:07:29,717 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-23 03:07:29,723 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-23 03:07:29,724 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 03:07:29" (1/1) ... [2021-11-23 03:07:29,726 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@74601673 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:07:29, skipping insertion in model container [2021-11-23 03:07:29,726 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 03:07:29" (1/1) ... [2021-11-23 03:07:29,734 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-23 03:07:29,778 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-23 03:07:29,927 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_094b7207-5913-40c5-a95b-0c93f54561b9/sv-benchmarks/c/combinations/pc_sfifo_1.cil-2+token_ring.05.cil-2.c[913,926] [2021-11-23 03:07:29,978 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_094b7207-5913-40c5-a95b-0c93f54561b9/sv-benchmarks/c/combinations/pc_sfifo_1.cil-2+token_ring.05.cil-2.c[5977,5990] [2021-11-23 03:07:30,047 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 03:07:30,059 INFO L203 MainTranslator]: Completed pre-run [2021-11-23 03:07:30,073 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_094b7207-5913-40c5-a95b-0c93f54561b9/sv-benchmarks/c/combinations/pc_sfifo_1.cil-2+token_ring.05.cil-2.c[913,926] [2021-11-23 03:07:30,097 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_094b7207-5913-40c5-a95b-0c93f54561b9/sv-benchmarks/c/combinations/pc_sfifo_1.cil-2+token_ring.05.cil-2.c[5977,5990] [2021-11-23 03:07:30,182 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 03:07:30,204 INFO L208 MainTranslator]: Completed translation [2021-11-23 03:07:30,205 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:07:30 WrapperNode [2021-11-23 03:07:30,205 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-23 03:07:30,206 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-23 03:07:30,207 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-23 03:07:30,207 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-23 03:07:30,215 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:07:30" (1/1) ... [2021-11-23 03:07:30,231 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:07:30" (1/1) ... [2021-11-23 03:07:30,281 INFO L137 Inliner]: procedures = 58, calls = 64, calls flagged for inlining = 32, calls inlined = 32, statements flattened = 654 [2021-11-23 03:07:30,282 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-23 03:07:30,283 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-23 03:07:30,283 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-23 03:07:30,283 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-23 03:07:30,293 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:07:30" (1/1) ... [2021-11-23 03:07:30,294 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:07:30" (1/1) ... [2021-11-23 03:07:30,299 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:07:30" (1/1) ... [2021-11-23 03:07:30,317 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:07:30" (1/1) ... [2021-11-23 03:07:30,331 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:07:30" (1/1) ... [2021-11-23 03:07:30,360 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:07:30" (1/1) ... [2021-11-23 03:07:30,374 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:07:30" (1/1) ... [2021-11-23 03:07:30,380 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-23 03:07:30,381 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-23 03:07:30,381 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-23 03:07:30,381 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-23 03:07:30,387 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:07:30" (1/1) ... [2021-11-23 03:07:30,398 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 03:07:30,416 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_094b7207-5913-40c5-a95b-0c93f54561b9/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:07:30,443 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_094b7207-5913-40c5-a95b-0c93f54561b9/bin/utaipan-EQgc7hIp5V/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-23 03:07:30,463 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_094b7207-5913-40c5-a95b-0c93f54561b9/bin/utaipan-EQgc7hIp5V/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-23 03:07:30,504 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-23 03:07:30,505 INFO L130 BoogieDeclarations]: Found specification of procedure immediate_notify [2021-11-23 03:07:30,505 INFO L138 BoogieDeclarations]: Found implementation of procedure immediate_notify [2021-11-23 03:07:30,505 INFO L130 BoogieDeclarations]: Found specification of procedure immediate_notify_threads [2021-11-23 03:07:30,506 INFO L138 BoogieDeclarations]: Found implementation of procedure immediate_notify_threads [2021-11-23 03:07:30,506 INFO L130 BoogieDeclarations]: Found specification of procedure exists_runnable_thread1 [2021-11-23 03:07:30,506 INFO L138 BoogieDeclarations]: Found implementation of procedure exists_runnable_thread1 [2021-11-23 03:07:30,506 INFO L130 BoogieDeclarations]: Found specification of procedure exists_runnable_thread2 [2021-11-23 03:07:30,506 INFO L138 BoogieDeclarations]: Found implementation of procedure exists_runnable_thread2 [2021-11-23 03:07:30,506 INFO L130 BoogieDeclarations]: Found specification of procedure reset_delta_events2 [2021-11-23 03:07:30,507 INFO L138 BoogieDeclarations]: Found implementation of procedure reset_delta_events2 [2021-11-23 03:07:30,507 INFO L130 BoogieDeclarations]: Found specification of procedure activate_threads2 [2021-11-23 03:07:30,507 INFO L138 BoogieDeclarations]: Found implementation of procedure activate_threads2 [2021-11-23 03:07:30,507 INFO L130 BoogieDeclarations]: Found specification of procedure update_channels2 [2021-11-23 03:07:30,507 INFO L138 BoogieDeclarations]: Found implementation of procedure update_channels2 [2021-11-23 03:07:30,507 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-23 03:07:30,508 INFO L130 BoogieDeclarations]: Found specification of procedure fire_delta_events2 [2021-11-23 03:07:30,508 INFO L138 BoogieDeclarations]: Found implementation of procedure fire_delta_events2 [2021-11-23 03:07:30,508 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-23 03:07:30,508 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-23 03:07:30,508 INFO L130 BoogieDeclarations]: Found specification of procedure error1 [2021-11-23 03:07:30,508 INFO L138 BoogieDeclarations]: Found implementation of procedure error1 [2021-11-23 03:07:30,509 INFO L130 BoogieDeclarations]: Found specification of procedure error2 [2021-11-23 03:07:30,509 INFO L138 BoogieDeclarations]: Found implementation of procedure error2 [2021-11-23 03:07:30,704 INFO L236 CfgBuilder]: Building ICFG [2021-11-23 03:07:30,706 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-23 03:07:31,514 INFO L277 CfgBuilder]: Performing block encoding [2021-11-23 03:07:31,817 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-23 03:07:31,817 INFO L301 CfgBuilder]: Removed 12 assume(true) statements. [2021-11-23 03:07:31,820 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 03:07:31 BoogieIcfgContainer [2021-11-23 03:07:31,821 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-23 03:07:31,823 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-23 03:07:31,823 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-23 03:07:31,827 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-23 03:07:31,828 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.11 03:07:29" (1/3) ... [2021-11-23 03:07:31,829 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1eca8ba0 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 03:07:31, skipping insertion in model container [2021-11-23 03:07:31,829 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 03:07:30" (2/3) ... [2021-11-23 03:07:31,830 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1eca8ba0 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 03:07:31, skipping insertion in model container [2021-11-23 03:07:31,830 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 03:07:31" (3/3) ... [2021-11-23 03:07:31,834 INFO L111 eAbstractionObserver]: Analyzing ICFG pc_sfifo_1.cil-2+token_ring.05.cil-2.c [2021-11-23 03:07:31,839 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-23 03:07:31,840 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 2 error locations. [2021-11-23 03:07:31,912 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-23 03:07:31,922 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 [2021-11-23 03:07:31,922 INFO L340 AbstractCegarLoop]: Starting to check reachability of 2 error locations. [2021-11-23 03:07:31,964 INFO L276 IsEmpty]: Start isEmpty. Operand has 168 states, 128 states have (on average 1.5546875) internal successors, (199), 135 states have internal predecessors, (199), 27 states have call successors, (27), 10 states have call predecessors, (27), 10 states have return successors, (27), 25 states have call predecessors, (27), 27 states have call successors, (27) [2021-11-23 03:07:31,972 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-11-23 03:07:31,972 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:07:31,973 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:07:31,973 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:07:31,979 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:07:31,979 INFO L85 PathProgramCache]: Analyzing trace with hash 223793292, now seen corresponding path program 1 times [2021-11-23 03:07:31,988 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:07:31,988 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [592588758] [2021-11-23 03:07:31,988 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:07:31,989 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:07:32,104 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:07:32,190 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:07:32,191 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:07:32,191 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [592588758] [2021-11-23 03:07:32,192 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [592588758] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:07:32,192 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 03:07:32,192 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 03:07:32,194 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1518960716] [2021-11-23 03:07:32,195 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:07:32,199 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 03:07:32,199 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:07:32,227 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 03:07:32,228 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 03:07:32,231 INFO L87 Difference]: Start difference. First operand has 168 states, 128 states have (on average 1.5546875) internal successors, (199), 135 states have internal predecessors, (199), 27 states have call successors, (27), 10 states have call predecessors, (27), 10 states have return successors, (27), 25 states have call predecessors, (27), 27 states have call successors, (27) Second operand has 3 states, 3 states have (on average 7.666666666666667) internal successors, (23), 3 states have internal predecessors, (23), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-23 03:07:32,438 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:07:32,438 INFO L93 Difference]: Finished difference Result 368 states and 554 transitions. [2021-11-23 03:07:32,439 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 03:07:32,441 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 7.666666666666667) internal successors, (23), 3 states have internal predecessors, (23), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 28 [2021-11-23 03:07:32,441 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:07:32,453 INFO L225 Difference]: With dead ends: 368 [2021-11-23 03:07:32,453 INFO L226 Difference]: Without dead ends: 200 [2021-11-23 03:07:32,459 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 03:07:32,462 INFO L933 BasicCegarLoop]: 215 mSDtfsCounter, 218 mSDsluCounter, 61 mSDsCounter, 0 mSdLazyCounter, 52 mSolverCounterSat, 13 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 218 SdHoareTripleChecker+Valid, 270 SdHoareTripleChecker+Invalid, 65 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 13 IncrementalHoareTripleChecker+Valid, 52 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 03:07:32,464 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [218 Valid, 270 Invalid, 65 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [13 Valid, 52 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 03:07:32,483 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 200 states. [2021-11-23 03:07:32,522 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 200 to 196. [2021-11-23 03:07:32,524 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 196 states, 154 states have (on average 1.4675324675324675) internal successors, (226), 158 states have internal predecessors, (226), 30 states have call successors, (30), 12 states have call predecessors, (30), 10 states have return successors, (26), 26 states have call predecessors, (26), 26 states have call successors, (26) [2021-11-23 03:07:32,528 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 196 states to 196 states and 282 transitions. [2021-11-23 03:07:32,530 INFO L78 Accepts]: Start accepts. Automaton has 196 states and 282 transitions. Word has length 28 [2021-11-23 03:07:32,530 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:07:32,530 INFO L470 AbstractCegarLoop]: Abstraction has 196 states and 282 transitions. [2021-11-23 03:07:32,531 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 7.666666666666667) internal successors, (23), 3 states have internal predecessors, (23), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-23 03:07:32,531 INFO L276 IsEmpty]: Start isEmpty. Operand 196 states and 282 transitions. [2021-11-23 03:07:32,533 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2021-11-23 03:07:32,534 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:07:32,534 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:07:32,534 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-23 03:07:32,535 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:07:32,535 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:07:32,535 INFO L85 PathProgramCache]: Analyzing trace with hash 1239381846, now seen corresponding path program 1 times [2021-11-23 03:07:32,536 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:07:32,536 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1937672434] [2021-11-23 03:07:32,536 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:07:32,536 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:07:32,565 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:07:32,606 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:07:32,607 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:07:32,607 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1937672434] [2021-11-23 03:07:32,607 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1937672434] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:07:32,607 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 03:07:32,608 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 03:07:32,608 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1328437810] [2021-11-23 03:07:32,608 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:07:32,609 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 03:07:32,610 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:07:32,610 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 03:07:32,611 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 03:07:32,611 INFO L87 Difference]: Start difference. First operand 196 states and 282 transitions. Second operand has 3 states, 3 states have (on average 8.0) internal successors, (24), 3 states have internal predecessors, (24), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-23 03:07:32,715 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:07:32,715 INFO L93 Difference]: Finished difference Result 352 states and 499 transitions. [2021-11-23 03:07:32,716 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 03:07:32,716 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 8.0) internal successors, (24), 3 states have internal predecessors, (24), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 29 [2021-11-23 03:07:32,716 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:07:32,719 INFO L225 Difference]: With dead ends: 352 [2021-11-23 03:07:32,719 INFO L226 Difference]: Without dead ends: 271 [2021-11-23 03:07:32,720 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 03:07:32,722 INFO L933 BasicCegarLoop]: 202 mSDtfsCounter, 216 mSDsluCounter, 58 mSDsCounter, 0 mSdLazyCounter, 48 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 216 SdHoareTripleChecker+Valid, 255 SdHoareTripleChecker+Invalid, 51 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 48 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 03:07:32,723 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [216 Valid, 255 Invalid, 51 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 48 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 03:07:32,724 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 271 states. [2021-11-23 03:07:32,757 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 271 to 267. [2021-11-23 03:07:32,758 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 267 states, 214 states have (on average 1.4345794392523366) internal successors, (307), 218 states have internal predecessors, (307), 37 states have call successors, (37), 16 states have call predecessors, (37), 14 states have return successors, (33), 33 states have call predecessors, (33), 33 states have call successors, (33) [2021-11-23 03:07:32,761 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 267 states to 267 states and 377 transitions. [2021-11-23 03:07:32,762 INFO L78 Accepts]: Start accepts. Automaton has 267 states and 377 transitions. Word has length 29 [2021-11-23 03:07:32,762 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:07:32,762 INFO L470 AbstractCegarLoop]: Abstraction has 267 states and 377 transitions. [2021-11-23 03:07:32,762 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 8.0) internal successors, (24), 3 states have internal predecessors, (24), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-23 03:07:32,763 INFO L276 IsEmpty]: Start isEmpty. Operand 267 states and 377 transitions. [2021-11-23 03:07:32,765 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2021-11-23 03:07:32,765 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:07:32,765 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:07:32,766 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-11-23 03:07:32,766 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:07:32,766 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:07:32,767 INFO L85 PathProgramCache]: Analyzing trace with hash -746043494, now seen corresponding path program 1 times [2021-11-23 03:07:32,767 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:07:32,767 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1547874530] [2021-11-23 03:07:32,767 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:07:32,767 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:07:32,789 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:07:32,824 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:07:32,824 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:07:32,824 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1547874530] [2021-11-23 03:07:32,825 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1547874530] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:07:32,825 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 03:07:32,825 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 03:07:32,825 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1144095642] [2021-11-23 03:07:32,826 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:07:32,826 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 03:07:32,826 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:07:32,827 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 03:07:32,827 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 03:07:32,827 INFO L87 Difference]: Start difference. First operand 267 states and 377 transitions. Second operand has 3 states, 3 states have (on average 8.333333333333334) internal successors, (25), 3 states have internal predecessors, (25), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-23 03:07:32,928 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:07:32,928 INFO L93 Difference]: Finished difference Result 507 states and 705 transitions. [2021-11-23 03:07:32,928 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 03:07:32,928 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 8.333333333333334) internal successors, (25), 3 states have internal predecessors, (25), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 30 [2021-11-23 03:07:32,929 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:07:32,932 INFO L225 Difference]: With dead ends: 507 [2021-11-23 03:07:32,932 INFO L226 Difference]: Without dead ends: 355 [2021-11-23 03:07:32,933 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 03:07:32,935 INFO L933 BasicCegarLoop]: 212 mSDtfsCounter, 46 mSDsluCounter, 216 mSDsCounter, 0 mSdLazyCounter, 77 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 46 SdHoareTripleChecker+Valid, 395 SdHoareTripleChecker+Invalid, 81 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 77 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 03:07:32,935 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [46 Valid, 395 Invalid, 81 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 77 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 03:07:32,937 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 355 states. [2021-11-23 03:07:32,965 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 355 to 341. [2021-11-23 03:07:32,966 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 341 states, 277 states have (on average 1.4151624548736461) internal successors, (392), 283 states have internal predecessors, (392), 43 states have call successors, (43), 21 states have call predecessors, (43), 19 states have return successors, (39), 37 states have call predecessors, (39), 39 states have call successors, (39) [2021-11-23 03:07:32,969 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 341 states to 341 states and 474 transitions. [2021-11-23 03:07:32,970 INFO L78 Accepts]: Start accepts. Automaton has 341 states and 474 transitions. Word has length 30 [2021-11-23 03:07:32,970 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:07:32,970 INFO L470 AbstractCegarLoop]: Abstraction has 341 states and 474 transitions. [2021-11-23 03:07:32,970 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 8.333333333333334) internal successors, (25), 3 states have internal predecessors, (25), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2021-11-23 03:07:32,971 INFO L276 IsEmpty]: Start isEmpty. Operand 341 states and 474 transitions. [2021-11-23 03:07:32,973 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2021-11-23 03:07:32,974 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:07:32,974 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:07:32,974 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-11-23 03:07:32,974 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:07:32,975 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:07:32,975 INFO L85 PathProgramCache]: Analyzing trace with hash 1145372293, now seen corresponding path program 1 times [2021-11-23 03:07:32,975 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:07:32,975 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [899520889] [2021-11-23 03:07:32,976 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:07:32,976 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:07:32,994 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:07:33,037 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 9 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 03:07:33,037 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:07:33,037 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [899520889] [2021-11-23 03:07:33,038 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [899520889] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:07:33,038 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 03:07:33,038 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 03:07:33,038 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [168159298] [2021-11-23 03:07:33,038 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:07:33,039 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 03:07:33,039 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:07:33,040 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 03:07:33,040 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 03:07:33,040 INFO L87 Difference]: Start difference. First operand 341 states and 474 transitions. Second operand has 3 states, 3 states have (on average 11.666666666666666) internal successors, (35), 3 states have internal predecessors, (35), 3 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-23 03:07:33,152 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:07:33,153 INFO L93 Difference]: Finished difference Result 504 states and 692 transitions. [2021-11-23 03:07:33,153 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 03:07:33,153 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 11.666666666666666) internal successors, (35), 3 states have internal predecessors, (35), 3 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 43 [2021-11-23 03:07:33,154 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:07:33,158 INFO L225 Difference]: With dead ends: 504 [2021-11-23 03:07:33,158 INFO L226 Difference]: Without dead ends: 346 [2021-11-23 03:07:33,159 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 03:07:33,160 INFO L933 BasicCegarLoop]: 231 mSDtfsCounter, 32 mSDsluCounter, 227 mSDsCounter, 0 mSdLazyCounter, 80 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 32 SdHoareTripleChecker+Valid, 427 SdHoareTripleChecker+Invalid, 80 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 80 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 03:07:33,161 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [32 Valid, 427 Invalid, 80 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 80 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 03:07:33,162 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 346 states. [2021-11-23 03:07:33,185 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 346 to 335. [2021-11-23 03:07:33,186 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 335 states, 271 states have (on average 1.3948339483394834) internal successors, (378), 277 states have internal predecessors, (378), 43 states have call successors, (43), 21 states have call predecessors, (43), 19 states have return successors, (39), 37 states have call predecessors, (39), 39 states have call successors, (39) [2021-11-23 03:07:33,188 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 335 states to 335 states and 460 transitions. [2021-11-23 03:07:33,189 INFO L78 Accepts]: Start accepts. Automaton has 335 states and 460 transitions. Word has length 43 [2021-11-23 03:07:33,189 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:07:33,189 INFO L470 AbstractCegarLoop]: Abstraction has 335 states and 460 transitions. [2021-11-23 03:07:33,190 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 11.666666666666666) internal successors, (35), 3 states have internal predecessors, (35), 3 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-23 03:07:33,190 INFO L276 IsEmpty]: Start isEmpty. Operand 335 states and 460 transitions. [2021-11-23 03:07:33,192 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2021-11-23 03:07:33,192 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:07:33,192 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:07:33,193 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-11-23 03:07:33,193 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:07:33,193 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:07:33,194 INFO L85 PathProgramCache]: Analyzing trace with hash 1247449787, now seen corresponding path program 1 times [2021-11-23 03:07:33,194 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:07:33,194 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [412408764] [2021-11-23 03:07:33,194 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:07:33,194 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:07:33,234 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:07:33,314 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:07:33,314 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:07:33,315 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [412408764] [2021-11-23 03:07:33,318 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [412408764] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:07:33,319 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 03:07:33,319 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 03:07:33,319 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [793829338] [2021-11-23 03:07:33,319 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:07:33,320 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 03:07:33,320 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:07:33,321 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 03:07:33,321 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 03:07:33,321 INFO L87 Difference]: Start difference. First operand 335 states and 460 transitions. Second operand has 4 states, 4 states have (on average 9.0) internal successors, (36), 4 states have internal predecessors, (36), 2 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2021-11-23 03:07:33,630 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:07:33,630 INFO L93 Difference]: Finished difference Result 541 states and 781 transitions. [2021-11-23 03:07:33,631 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 03:07:33,631 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 9.0) internal successors, (36), 4 states have internal predecessors, (36), 2 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) Word has length 47 [2021-11-23 03:07:33,632 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:07:33,636 INFO L225 Difference]: With dead ends: 541 [2021-11-23 03:07:33,637 INFO L226 Difference]: Without dead ends: 432 [2021-11-23 03:07:33,640 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 03:07:33,644 INFO L933 BasicCegarLoop]: 308 mSDtfsCounter, 347 mSDsluCounter, 284 mSDsCounter, 0 mSdLazyCounter, 210 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 347 SdHoareTripleChecker+Valid, 534 SdHoareTripleChecker+Invalid, 217 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 210 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 03:07:33,647 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [347 Valid, 534 Invalid, 217 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 210 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-23 03:07:33,650 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 432 states. [2021-11-23 03:07:33,688 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 432 to 431. [2021-11-23 03:07:33,690 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 431 states, 346 states have (on average 1.3988439306358382) internal successors, (484), 353 states have internal predecessors, (484), 58 states have call successors, (58), 27 states have call predecessors, (58), 25 states have return successors, (54), 51 states have call predecessors, (54), 54 states have call successors, (54) [2021-11-23 03:07:33,694 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 431 states to 431 states and 596 transitions. [2021-11-23 03:07:33,694 INFO L78 Accepts]: Start accepts. Automaton has 431 states and 596 transitions. Word has length 47 [2021-11-23 03:07:33,694 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:07:33,695 INFO L470 AbstractCegarLoop]: Abstraction has 431 states and 596 transitions. [2021-11-23 03:07:33,696 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 9.0) internal successors, (36), 4 states have internal predecessors, (36), 2 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2021-11-23 03:07:33,696 INFO L276 IsEmpty]: Start isEmpty. Operand 431 states and 596 transitions. [2021-11-23 03:07:33,701 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2021-11-23 03:07:33,701 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:07:33,702 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:07:33,702 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-11-23 03:07:33,702 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:07:33,703 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:07:33,703 INFO L85 PathProgramCache]: Analyzing trace with hash 779907487, now seen corresponding path program 1 times [2021-11-23 03:07:33,704 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:07:33,704 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [120362895] [2021-11-23 03:07:33,704 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:07:33,704 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:07:33,731 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:07:33,783 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-23 03:07:33,784 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:07:33,784 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [120362895] [2021-11-23 03:07:33,784 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [120362895] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:07:33,784 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 03:07:33,785 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 03:07:33,785 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [768269063] [2021-11-23 03:07:33,785 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:07:33,786 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 03:07:33,787 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:07:33,788 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 03:07:33,788 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 03:07:33,788 INFO L87 Difference]: Start difference. First operand 431 states and 596 transitions. Second operand has 3 states, 3 states have (on average 10.666666666666666) internal successors, (32), 3 states have internal predecessors, (32), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-11-23 03:07:33,916 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:07:33,917 INFO L93 Difference]: Finished difference Result 680 states and 920 transitions. [2021-11-23 03:07:33,917 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 03:07:33,918 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 10.666666666666666) internal successors, (32), 3 states have internal predecessors, (32), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 46 [2021-11-23 03:07:33,920 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:07:33,925 INFO L225 Difference]: With dead ends: 680 [2021-11-23 03:07:33,925 INFO L226 Difference]: Without dead ends: 477 [2021-11-23 03:07:33,926 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 03:07:33,933 INFO L933 BasicCegarLoop]: 200 mSDtfsCounter, 201 mSDsluCounter, 58 mSDsCounter, 0 mSdLazyCounter, 49 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 201 SdHoareTripleChecker+Valid, 252 SdHoareTripleChecker+Invalid, 52 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 49 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 03:07:33,936 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [201 Valid, 252 Invalid, 52 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 49 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 03:07:33,940 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 477 states. [2021-11-23 03:07:33,983 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 477 to 477. [2021-11-23 03:07:33,984 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 477 states, 385 states have (on average 1.3688311688311687) internal successors, (527), 392 states have internal predecessors, (527), 62 states have call successors, (62), 30 states have call predecessors, (62), 28 states have return successors, (58), 55 states have call predecessors, (58), 58 states have call successors, (58) [2021-11-23 03:07:33,989 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 477 states to 477 states and 647 transitions. [2021-11-23 03:07:33,990 INFO L78 Accepts]: Start accepts. Automaton has 477 states and 647 transitions. Word has length 46 [2021-11-23 03:07:33,990 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:07:33,991 INFO L470 AbstractCegarLoop]: Abstraction has 477 states and 647 transitions. [2021-11-23 03:07:33,992 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 10.666666666666666) internal successors, (32), 3 states have internal predecessors, (32), 2 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-11-23 03:07:33,994 INFO L276 IsEmpty]: Start isEmpty. Operand 477 states and 647 transitions. [2021-11-23 03:07:33,997 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2021-11-23 03:07:33,998 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:07:33,998 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:07:33,998 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2021-11-23 03:07:33,999 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:07:34,000 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:07:34,000 INFO L85 PathProgramCache]: Analyzing trace with hash -667702489, now seen corresponding path program 1 times [2021-11-23 03:07:34,000 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:07:34,001 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2084432090] [2021-11-23 03:07:34,001 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:07:34,001 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:07:34,043 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:07:34,094 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-23 03:07:34,094 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:07:34,095 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2084432090] [2021-11-23 03:07:34,095 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2084432090] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:07:34,095 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 03:07:34,095 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 03:07:34,096 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [523636477] [2021-11-23 03:07:34,096 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:07:34,096 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 03:07:34,097 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:07:34,097 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 03:07:34,097 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 03:07:34,098 INFO L87 Difference]: Start difference. First operand 477 states and 647 transitions. Second operand has 4 states, 4 states have (on average 8.75) internal successors, (35), 4 states have internal predecessors, (35), 4 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-23 03:07:34,305 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:07:34,305 INFO L93 Difference]: Finished difference Result 517 states and 694 transitions. [2021-11-23 03:07:34,306 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 03:07:34,306 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 8.75) internal successors, (35), 4 states have internal predecessors, (35), 4 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 47 [2021-11-23 03:07:34,307 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:07:34,312 INFO L225 Difference]: With dead ends: 517 [2021-11-23 03:07:34,313 INFO L226 Difference]: Without dead ends: 514 [2021-11-23 03:07:34,314 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-23 03:07:34,315 INFO L933 BasicCegarLoop]: 209 mSDtfsCounter, 370 mSDsluCounter, 47 mSDsCounter, 0 mSdLazyCounter, 52 mSolverCounterSat, 95 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 370 SdHoareTripleChecker+Valid, 250 SdHoareTripleChecker+Invalid, 147 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 95 IncrementalHoareTripleChecker+Valid, 52 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2021-11-23 03:07:34,315 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [370 Valid, 250 Invalid, 147 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [95 Valid, 52 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2021-11-23 03:07:34,318 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 514 states. [2021-11-23 03:07:34,356 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 514 to 476. [2021-11-23 03:07:34,357 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 476 states, 385 states have (on average 1.3636363636363635) internal successors, (525), 391 states have internal predecessors, (525), 61 states have call successors, (61), 30 states have call predecessors, (61), 28 states have return successors, (58), 55 states have call predecessors, (58), 58 states have call successors, (58) [2021-11-23 03:07:34,361 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 476 states to 476 states and 644 transitions. [2021-11-23 03:07:34,361 INFO L78 Accepts]: Start accepts. Automaton has 476 states and 644 transitions. Word has length 47 [2021-11-23 03:07:34,362 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:07:34,363 INFO L470 AbstractCegarLoop]: Abstraction has 476 states and 644 transitions. [2021-11-23 03:07:34,363 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 8.75) internal successors, (35), 4 states have internal predecessors, (35), 4 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-23 03:07:34,363 INFO L276 IsEmpty]: Start isEmpty. Operand 476 states and 644 transitions. [2021-11-23 03:07:34,364 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2021-11-23 03:07:34,365 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:07:34,365 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:07:34,365 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2021-11-23 03:07:34,365 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:07:34,367 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:07:34,367 INFO L85 PathProgramCache]: Analyzing trace with hash 775152034, now seen corresponding path program 1 times [2021-11-23 03:07:34,367 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:07:34,368 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1956740924] [2021-11-23 03:07:34,368 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:07:34,370 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:07:34,393 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:07:34,471 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-23 03:07:34,471 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:07:34,471 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1956740924] [2021-11-23 03:07:34,472 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1956740924] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:07:34,472 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1750404515] [2021-11-23 03:07:34,472 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:07:34,472 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:07:34,473 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_094b7207-5913-40c5-a95b-0c93f54561b9/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:07:34,474 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_094b7207-5913-40c5-a95b-0c93f54561b9/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:07:34,492 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_094b7207-5913-40c5-a95b-0c93f54561b9/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-23 03:07:34,602 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:07:34,605 INFO L263 TraceCheckSpWp]: Trace formula consists of 292 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 03:07:34,613 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:07:35,126 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 03:07:35,126 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:07:35,338 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-23 03:07:35,339 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1750404515] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:07:35,339 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1129861240] [2021-11-23 03:07:35,365 INFO L159 IcfgInterpreter]: Started Sifa with 40 locations of interest [2021-11-23 03:07:35,366 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 03:07:35,371 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 03:07:35,378 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 03:07:35,379 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 03:07:39,347 INFO L197 IcfgInterpreter]: Interpreting procedure exists_runnable_thread1 with input of size 130 for LOIs [2021-11-23 03:07:39,370 INFO L197 IcfgInterpreter]: Interpreting procedure immediate_notify_threads with input of size 275 for LOIs [2021-11-23 03:07:41,222 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 03:07:59,191 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSifa [1129861240] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:07:59,191 INFO L186 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2021-11-23 03:07:59,191 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [27] imperfect sequences [5, 5, 4] total 33 [2021-11-23 03:07:59,192 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [678343205] [2021-11-23 03:07:59,193 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:07:59,193 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2021-11-23 03:07:59,193 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:07:59,194 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2021-11-23 03:07:59,195 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=127, Invalid=929, Unknown=0, NotChecked=0, Total=1056 [2021-11-23 03:07:59,195 INFO L87 Difference]: Start difference. First operand 476 states and 644 transitions. Second operand has 28 states, 24 states have (on average 1.4583333333333333) internal successors, (35), 23 states have internal predecessors, (35), 4 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-23 03:08:12,483 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:08:12,484 INFO L93 Difference]: Finished difference Result 782 states and 1034 transitions. [2021-11-23 03:08:12,484 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2021-11-23 03:08:12,484 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 24 states have (on average 1.4583333333333333) internal successors, (35), 23 states have internal predecessors, (35), 4 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 48 [2021-11-23 03:08:12,485 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:08:12,488 INFO L225 Difference]: With dead ends: 782 [2021-11-23 03:08:12,489 INFO L226 Difference]: Without dead ends: 517 [2021-11-23 03:08:12,490 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 153 GetRequests, 110 SyntacticMatches, 6 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 551 ImplicationChecksByTransitivity, 25.8s TimeCoverageRelationStatistics Valid=183, Invalid=1299, Unknown=0, NotChecked=0, Total=1482 [2021-11-23 03:08:12,491 INFO L933 BasicCegarLoop]: 194 mSDtfsCounter, 45 mSDsluCounter, 1605 mSDsCounter, 0 mSdLazyCounter, 3203 mSolverCounterSat, 24 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 49 SdHoareTripleChecker+Valid, 1735 SdHoareTripleChecker+Invalid, 3227 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 24 IncrementalHoareTripleChecker+Valid, 3203 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 5.3s IncrementalHoareTripleChecker+Time [2021-11-23 03:08:12,492 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [49 Valid, 1735 Invalid, 3227 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [24 Valid, 3203 Invalid, 0 Unknown, 0 Unchecked, 5.3s Time] [2021-11-23 03:08:12,493 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 517 states. [2021-11-23 03:08:12,525 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 517 to 504. [2021-11-23 03:08:12,526 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 504 states, 410 states have (on average 1.3439024390243903) internal successors, (551), 416 states have internal predecessors, (551), 62 states have call successors, (62), 32 states have call predecessors, (62), 30 states have return successors, (59), 56 states have call predecessors, (59), 59 states have call successors, (59) [2021-11-23 03:08:12,530 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 504 states to 504 states and 672 transitions. [2021-11-23 03:08:12,530 INFO L78 Accepts]: Start accepts. Automaton has 504 states and 672 transitions. Word has length 48 [2021-11-23 03:08:12,531 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:08:12,531 INFO L470 AbstractCegarLoop]: Abstraction has 504 states and 672 transitions. [2021-11-23 03:08:12,531 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 28 states, 24 states have (on average 1.4583333333333333) internal successors, (35), 23 states have internal predecessors, (35), 4 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-23 03:08:12,531 INFO L276 IsEmpty]: Start isEmpty. Operand 504 states and 672 transitions. [2021-11-23 03:08:12,533 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2021-11-23 03:08:12,533 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:08:12,533 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:08:12,575 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_094b7207-5913-40c5-a95b-0c93f54561b9/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-23 03:08:12,753 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_094b7207-5913-40c5-a95b-0c93f54561b9/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:08:12,753 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:08:12,754 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:08:12,754 INFO L85 PathProgramCache]: Analyzing trace with hash 206135883, now seen corresponding path program 1 times [2021-11-23 03:08:12,754 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:08:12,754 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1575652318] [2021-11-23 03:08:12,754 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:08:12,754 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:08:12,768 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:08:12,834 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 6 proven. 7 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 03:08:12,834 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:08:12,834 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1575652318] [2021-11-23 03:08:12,835 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1575652318] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:08:12,835 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1473347791] [2021-11-23 03:08:12,835 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:08:12,835 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:08:12,835 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_094b7207-5913-40c5-a95b-0c93f54561b9/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:08:12,837 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_094b7207-5913-40c5-a95b-0c93f54561b9/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:08:12,856 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_094b7207-5913-40c5-a95b-0c93f54561b9/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-23 03:08:12,925 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:08:12,927 INFO L263 TraceCheckSpWp]: Trace formula consists of 308 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 03:08:12,930 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:08:13,203 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-23 03:08:13,203 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:08:13,332 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-23 03:08:13,333 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1473347791] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:08:13,333 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1353912368] [2021-11-23 03:08:13,336 INFO L159 IcfgInterpreter]: Started Sifa with 40 locations of interest [2021-11-23 03:08:13,336 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 03:08:13,336 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 03:08:13,336 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 03:08:13,337 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 03:08:19,637 INFO L197 IcfgInterpreter]: Interpreting procedure exists_runnable_thread1 with input of size 149 for LOIs [2021-11-23 03:08:19,686 INFO L197 IcfgInterpreter]: Interpreting procedure immediate_notify_threads with input of size 275 for LOIs [2021-11-23 03:08:20,779 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 03:08:42,574 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSifa [1353912368] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:08:42,575 INFO L186 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2021-11-23 03:08:42,576 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [28] imperfect sequences [5, 5, 4] total 37 [2021-11-23 03:08:42,576 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [65138893] [2021-11-23 03:08:42,576 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:08:42,577 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2021-11-23 03:08:42,577 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:08:42,577 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2021-11-23 03:08:42,578 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=148, Invalid=1184, Unknown=0, NotChecked=0, Total=1332 [2021-11-23 03:08:42,579 INFO L87 Difference]: Start difference. First operand 504 states and 672 transitions. Second operand has 29 states, 25 states have (on average 1.48) internal successors, (37), 24 states have internal predecessors, (37), 4 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-23 03:08:58,062 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:08:58,062 INFO L93 Difference]: Finished difference Result 823 states and 1087 transitions. [2021-11-23 03:08:58,063 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2021-11-23 03:08:58,063 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 25 states have (on average 1.48) internal successors, (37), 24 states have internal predecessors, (37), 4 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 56 [2021-11-23 03:08:58,063 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:08:58,067 INFO L225 Difference]: With dead ends: 823 [2021-11-23 03:08:58,067 INFO L226 Difference]: Without dead ends: 595 [2021-11-23 03:08:58,069 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 183 GetRequests, 133 SyntacticMatches, 6 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 673 ImplicationChecksByTransitivity, 31.6s TimeCoverageRelationStatistics Valid=241, Invalid=1829, Unknown=0, NotChecked=0, Total=2070 [2021-11-23 03:08:58,069 INFO L933 BasicCegarLoop]: 197 mSDtfsCounter, 74 mSDsluCounter, 1895 mSDsCounter, 0 mSdLazyCounter, 3664 mSolverCounterSat, 32 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 5.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 80 SdHoareTripleChecker+Valid, 1995 SdHoareTripleChecker+Invalid, 3696 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 32 IncrementalHoareTripleChecker+Valid, 3664 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 5.5s IncrementalHoareTripleChecker+Time [2021-11-23 03:08:58,070 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [80 Valid, 1995 Invalid, 3696 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [32 Valid, 3664 Invalid, 0 Unknown, 0 Unchecked, 5.5s Time] [2021-11-23 03:08:58,071 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 595 states. [2021-11-23 03:08:58,118 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 595 to 545. [2021-11-23 03:08:58,119 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 545 states, 443 states have (on average 1.3431151241534989) internal successors, (595), 449 states have internal predecessors, (595), 68 states have call successors, (68), 34 states have call predecessors, (68), 32 states have return successors, (65), 62 states have call predecessors, (65), 65 states have call successors, (65) [2021-11-23 03:08:58,123 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 545 states to 545 states and 728 transitions. [2021-11-23 03:08:58,124 INFO L78 Accepts]: Start accepts. Automaton has 545 states and 728 transitions. Word has length 56 [2021-11-23 03:08:58,124 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:08:58,124 INFO L470 AbstractCegarLoop]: Abstraction has 545 states and 728 transitions. [2021-11-23 03:08:58,124 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 25 states have (on average 1.48) internal successors, (37), 24 states have internal predecessors, (37), 4 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-23 03:08:58,124 INFO L276 IsEmpty]: Start isEmpty. Operand 545 states and 728 transitions. [2021-11-23 03:08:58,126 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2021-11-23 03:08:58,126 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:08:58,127 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:08:58,165 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_094b7207-5913-40c5-a95b-0c93f54561b9/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-23 03:08:58,353 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_094b7207-5913-40c5-a95b-0c93f54561b9/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:08:58,353 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:08:58,354 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:08:58,354 INFO L85 PathProgramCache]: Analyzing trace with hash 1807190345, now seen corresponding path program 1 times [2021-11-23 03:08:58,354 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:08:58,354 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [529605171] [2021-11-23 03:08:58,354 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:08:58,354 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:08:58,366 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:08:58,407 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 7 proven. 7 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-23 03:08:58,407 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:08:58,407 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [529605171] [2021-11-23 03:08:58,408 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [529605171] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:08:58,408 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1603994588] [2021-11-23 03:08:58,408 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:08:58,408 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:08:58,408 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_094b7207-5913-40c5-a95b-0c93f54561b9/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:08:58,409 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_094b7207-5913-40c5-a95b-0c93f54561b9/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:08:58,420 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_094b7207-5913-40c5-a95b-0c93f54561b9/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-23 03:08:58,494 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:08:58,496 INFO L263 TraceCheckSpWp]: Trace formula consists of 315 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 03:08:58,498 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:08:58,578 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 16 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 03:08:58,579 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 03:08:58,579 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1603994588] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:08:58,579 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 03:08:58,579 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [5] total 6 [2021-11-23 03:08:58,580 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1185810741] [2021-11-23 03:08:58,580 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:08:58,580 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 03:08:58,580 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:08:58,581 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 03:08:58,581 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-11-23 03:08:58,581 INFO L87 Difference]: Start difference. First operand 545 states and 728 transitions. Second operand has 3 states, 3 states have (on average 15.666666666666666) internal successors, (47), 3 states have internal predecessors, (47), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) [2021-11-23 03:08:58,680 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:08:58,680 INFO L93 Difference]: Finished difference Result 743 states and 975 transitions. [2021-11-23 03:08:58,680 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 03:08:58,681 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 15.666666666666666) internal successors, (47), 3 states have internal predecessors, (47), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) Word has length 57 [2021-11-23 03:08:58,681 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:08:58,684 INFO L225 Difference]: With dead ends: 743 [2021-11-23 03:08:58,684 INFO L226 Difference]: Without dead ends: 424 [2021-11-23 03:08:58,685 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 63 GetRequests, 59 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-11-23 03:08:58,685 INFO L933 BasicCegarLoop]: 217 mSDtfsCounter, 27 mSDsluCounter, 217 mSDsCounter, 0 mSdLazyCounter, 78 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 27 SdHoareTripleChecker+Valid, 404 SdHoareTripleChecker+Invalid, 78 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 78 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 03:08:58,686 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [27 Valid, 404 Invalid, 78 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 78 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 03:08:58,687 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 424 states. [2021-11-23 03:08:58,725 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 424 to 424. [2021-11-23 03:08:58,726 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 424 states, 340 states have (on average 1.3323529411764705) internal successors, (453), 345 states have internal predecessors, (453), 57 states have call successors, (57), 27 states have call predecessors, (57), 25 states have return successors, (54), 52 states have call predecessors, (54), 54 states have call successors, (54) [2021-11-23 03:08:58,729 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 424 states to 424 states and 564 transitions. [2021-11-23 03:08:58,729 INFO L78 Accepts]: Start accepts. Automaton has 424 states and 564 transitions. Word has length 57 [2021-11-23 03:08:58,729 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:08:58,729 INFO L470 AbstractCegarLoop]: Abstraction has 424 states and 564 transitions. [2021-11-23 03:08:58,730 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 15.666666666666666) internal successors, (47), 3 states have internal predecessors, (47), 3 states have call successors, (5), 3 states have call predecessors, (5), 3 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) [2021-11-23 03:08:58,730 INFO L276 IsEmpty]: Start isEmpty. Operand 424 states and 564 transitions. [2021-11-23 03:08:58,731 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2021-11-23 03:08:58,731 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:08:58,731 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:08:58,756 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_094b7207-5913-40c5-a95b-0c93f54561b9/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-23 03:08:58,937 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_094b7207-5913-40c5-a95b-0c93f54561b9/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2021-11-23 03:08:58,937 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:08:58,938 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:08:58,938 INFO L85 PathProgramCache]: Analyzing trace with hash -1191099750, now seen corresponding path program 1 times [2021-11-23 03:08:58,938 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:08:58,938 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [706530612] [2021-11-23 03:08:58,938 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:08:58,938 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:08:58,952 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:08:59,013 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-23 03:08:59,013 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:08:59,013 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [706530612] [2021-11-23 03:08:59,014 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [706530612] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:08:59,014 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2073912863] [2021-11-23 03:08:59,014 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:08:59,014 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:08:59,014 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_094b7207-5913-40c5-a95b-0c93f54561b9/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:08:59,015 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_094b7207-5913-40c5-a95b-0c93f54561b9/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:08:59,015 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_094b7207-5913-40c5-a95b-0c93f54561b9/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-23 03:08:59,098 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:08:59,099 INFO L263 TraceCheckSpWp]: Trace formula consists of 315 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 03:08:59,102 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:08:59,416 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-23 03:08:59,416 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:08:59,618 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-23 03:08:59,618 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2073912863] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:08:59,618 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1263332903] [2021-11-23 03:08:59,622 INFO L159 IcfgInterpreter]: Started Sifa with 40 locations of interest [2021-11-23 03:08:59,622 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 03:08:59,622 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 03:08:59,623 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 03:08:59,623 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 03:09:07,978 INFO L197 IcfgInterpreter]: Interpreting procedure exists_runnable_thread1 with input of size 207 for LOIs [2021-11-23 03:09:08,042 INFO L197 IcfgInterpreter]: Interpreting procedure immediate_notify_threads with input of size 213 for LOIs [2021-11-23 03:09:08,773 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 03:09:31,462 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSifa [1263332903] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:09:31,462 INFO L186 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2021-11-23 03:09:31,462 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [27] imperfect sequences [5, 5, 4] total 33 [2021-11-23 03:09:31,462 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1327570244] [2021-11-23 03:09:31,463 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:09:31,463 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2021-11-23 03:09:31,463 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:09:31,464 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2021-11-23 03:09:31,464 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=117, Invalid=939, Unknown=0, NotChecked=0, Total=1056 [2021-11-23 03:09:31,464 INFO L87 Difference]: Start difference. First operand 424 states and 564 transitions. Second operand has 28 states, 24 states have (on average 1.5416666666666667) internal successors, (37), 23 states have internal predecessors, (37), 4 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-23 03:09:40,581 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:09:40,582 INFO L93 Difference]: Finished difference Result 573 states and 749 transitions. [2021-11-23 03:09:40,582 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2021-11-23 03:09:40,582 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 24 states have (on average 1.5416666666666667) internal successors, (37), 23 states have internal predecessors, (37), 4 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 57 [2021-11-23 03:09:40,583 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:09:40,585 INFO L225 Difference]: With dead ends: 573 [2021-11-23 03:09:40,585 INFO L226 Difference]: Without dead ends: 443 [2021-11-23 03:09:40,586 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 184 GetRequests, 133 SyntacticMatches, 10 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 666 ImplicationChecksByTransitivity, 28.4s TimeCoverageRelationStatistics Valid=197, Invalid=1609, Unknown=0, NotChecked=0, Total=1806 [2021-11-23 03:09:40,587 INFO L933 BasicCegarLoop]: 191 mSDtfsCounter, 54 mSDsluCounter, 1484 mSDsCounter, 0 mSdLazyCounter, 2881 mSolverCounterSat, 31 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 58 SdHoareTripleChecker+Valid, 1619 SdHoareTripleChecker+Invalid, 2912 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 31 IncrementalHoareTripleChecker+Valid, 2881 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.4s IncrementalHoareTripleChecker+Time [2021-11-23 03:09:40,588 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [58 Valid, 1619 Invalid, 2912 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [31 Valid, 2881 Invalid, 0 Unknown, 0 Unchecked, 3.4s Time] [2021-11-23 03:09:40,589 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 443 states. [2021-11-23 03:09:40,630 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 443 to 433. [2021-11-23 03:09:40,631 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 433 states, 348 states have (on average 1.3218390804597702) internal successors, (460), 354 states have internal predecessors, (460), 57 states have call successors, (57), 28 states have call predecessors, (57), 26 states have return successors, (54), 51 states have call predecessors, (54), 54 states have call successors, (54) [2021-11-23 03:09:40,634 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 433 states to 433 states and 571 transitions. [2021-11-23 03:09:40,635 INFO L78 Accepts]: Start accepts. Automaton has 433 states and 571 transitions. Word has length 57 [2021-11-23 03:09:40,635 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:09:40,635 INFO L470 AbstractCegarLoop]: Abstraction has 433 states and 571 transitions. [2021-11-23 03:09:40,636 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 28 states, 24 states have (on average 1.5416666666666667) internal successors, (37), 23 states have internal predecessors, (37), 4 states have call successors, (4), 3 states have call predecessors, (4), 2 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2021-11-23 03:09:40,636 INFO L276 IsEmpty]: Start isEmpty. Operand 433 states and 571 transitions. [2021-11-23 03:09:40,637 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2021-11-23 03:09:40,637 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:09:40,638 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:09:40,660 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_094b7207-5913-40c5-a95b-0c93f54561b9/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-23 03:09:40,845 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_094b7207-5913-40c5-a95b-0c93f54561b9/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2021-11-23 03:09:40,845 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:09:40,845 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:09:40,846 INFO L85 PathProgramCache]: Analyzing trace with hash 22499406, now seen corresponding path program 1 times [2021-11-23 03:09:40,846 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:09:40,846 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1828463748] [2021-11-23 03:09:40,846 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:09:40,846 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:09:40,865 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:09:40,907 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2021-11-23 03:09:40,907 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:09:40,908 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1828463748] [2021-11-23 03:09:40,908 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1828463748] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:09:40,908 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 03:09:40,908 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 03:09:40,911 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1249414894] [2021-11-23 03:09:40,911 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:09:40,911 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 03:09:40,911 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:09:40,912 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 03:09:40,912 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 03:09:40,912 INFO L87 Difference]: Start difference. First operand 433 states and 571 transitions. Second operand has 4 states, 4 states have (on average 11.0) internal successors, (44), 4 states have internal predecessors, (44), 3 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-11-23 03:09:41,036 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:09:41,037 INFO L93 Difference]: Finished difference Result 548 states and 717 transitions. [2021-11-23 03:09:41,037 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 03:09:41,037 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 11.0) internal successors, (44), 4 states have internal predecessors, (44), 3 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 61 [2021-11-23 03:09:41,037 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:09:41,040 INFO L225 Difference]: With dead ends: 548 [2021-11-23 03:09:41,040 INFO L226 Difference]: Without dead ends: 433 [2021-11-23 03:09:41,041 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 03:09:41,042 INFO L933 BasicCegarLoop]: 204 mSDtfsCounter, 62 mSDsluCounter, 395 mSDsCounter, 0 mSdLazyCounter, 117 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 62 SdHoareTripleChecker+Valid, 537 SdHoareTripleChecker+Invalid, 121 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 117 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 03:09:41,042 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [62 Valid, 537 Invalid, 121 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 117 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 03:09:41,043 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 433 states. [2021-11-23 03:09:41,085 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 433 to 433. [2021-11-23 03:09:41,087 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 433 states, 348 states have (on average 1.3132183908045978) internal successors, (457), 354 states have internal predecessors, (457), 57 states have call successors, (57), 28 states have call predecessors, (57), 26 states have return successors, (54), 51 states have call predecessors, (54), 54 states have call successors, (54) [2021-11-23 03:09:41,090 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 433 states to 433 states and 568 transitions. [2021-11-23 03:09:41,090 INFO L78 Accepts]: Start accepts. Automaton has 433 states and 568 transitions. Word has length 61 [2021-11-23 03:09:41,090 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:09:41,091 INFO L470 AbstractCegarLoop]: Abstraction has 433 states and 568 transitions. [2021-11-23 03:09:41,091 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 11.0) internal successors, (44), 4 states have internal predecessors, (44), 3 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2021-11-23 03:09:41,091 INFO L276 IsEmpty]: Start isEmpty. Operand 433 states and 568 transitions. [2021-11-23 03:09:41,092 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2021-11-23 03:09:41,092 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:09:41,093 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:09:41,093 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2021-11-23 03:09:41,093 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:09:41,093 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:09:41,094 INFO L85 PathProgramCache]: Analyzing trace with hash 2122147471, now seen corresponding path program 1 times [2021-11-23 03:09:41,094 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:09:41,094 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [898891536] [2021-11-23 03:09:41,094 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:09:41,094 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:09:41,122 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:09:41,146 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 11 proven. 0 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-23 03:09:41,146 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:09:41,146 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [898891536] [2021-11-23 03:09:41,147 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [898891536] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:09:41,147 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 03:09:41,147 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-23 03:09:41,147 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1837731655] [2021-11-23 03:09:41,147 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:09:41,148 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 03:09:41,148 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:09:41,148 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 03:09:41,148 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 03:09:41,149 INFO L87 Difference]: Start difference. First operand 433 states and 568 transitions. Second operand has 4 states, 4 states have (on average 12.0) internal successors, (48), 4 states have internal predecessors, (48), 3 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (4), 3 states have call predecessors, (4), 2 states have call successors, (4) [2021-11-23 03:09:41,315 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:09:41,316 INFO L93 Difference]: Finished difference Result 552 states and 715 transitions. [2021-11-23 03:09:41,316 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 03:09:41,316 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 12.0) internal successors, (48), 4 states have internal predecessors, (48), 3 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (4), 3 states have call predecessors, (4), 2 states have call successors, (4) Word has length 61 [2021-11-23 03:09:41,317 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:09:41,320 INFO L225 Difference]: With dead ends: 552 [2021-11-23 03:09:41,321 INFO L226 Difference]: Without dead ends: 437 [2021-11-23 03:09:41,321 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-23 03:09:41,325 INFO L933 BasicCegarLoop]: 237 mSDtfsCounter, 254 mSDsluCounter, 214 mSDsCounter, 0 mSdLazyCounter, 148 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 254 SdHoareTripleChecker+Valid, 414 SdHoareTripleChecker+Invalid, 153 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 148 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 03:09:41,325 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [254 Valid, 414 Invalid, 153 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 148 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 03:09:41,327 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 437 states. [2021-11-23 03:09:41,369 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 437 to 429. [2021-11-23 03:09:41,370 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 429 states, 344 states have (on average 1.302325581395349) internal successors, (448), 350 states have internal predecessors, (448), 57 states have call successors, (57), 28 states have call predecessors, (57), 26 states have return successors, (54), 51 states have call predecessors, (54), 54 states have call successors, (54) [2021-11-23 03:09:41,373 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 429 states to 429 states and 559 transitions. [2021-11-23 03:09:41,374 INFO L78 Accepts]: Start accepts. Automaton has 429 states and 559 transitions. Word has length 61 [2021-11-23 03:09:41,374 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:09:41,374 INFO L470 AbstractCegarLoop]: Abstraction has 429 states and 559 transitions. [2021-11-23 03:09:41,375 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 12.0) internal successors, (48), 4 states have internal predecessors, (48), 3 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (4), 3 states have call predecessors, (4), 2 states have call successors, (4) [2021-11-23 03:09:41,375 INFO L276 IsEmpty]: Start isEmpty. Operand 429 states and 559 transitions. [2021-11-23 03:09:41,381 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2021-11-23 03:09:41,381 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:09:41,382 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:09:41,382 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2021-11-23 03:09:41,382 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:09:41,382 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:09:41,382 INFO L85 PathProgramCache]: Analyzing trace with hash -133075357, now seen corresponding path program 1 times [2021-11-23 03:09:41,383 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:09:41,383 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1583583343] [2021-11-23 03:09:41,383 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:09:41,383 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:09:41,402 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:09:41,478 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-23 03:09:41,478 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:09:41,478 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1583583343] [2021-11-23 03:09:41,478 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1583583343] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:09:41,478 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [980395784] [2021-11-23 03:09:41,479 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:09:41,479 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:09:41,479 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_094b7207-5913-40c5-a95b-0c93f54561b9/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:09:41,481 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_094b7207-5913-40c5-a95b-0c93f54561b9/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:09:41,503 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_094b7207-5913-40c5-a95b-0c93f54561b9/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-23 03:09:41,574 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:09:41,576 INFO L263 TraceCheckSpWp]: Trace formula consists of 341 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-23 03:09:41,579 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:09:41,898 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-23 03:09:41,899 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 03:09:42,102 INFO L134 CoverageAnalysis]: Checked inductivity of 20 backedges. 0 proven. 5 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-23 03:09:42,103 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [980395784] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 03:09:42,103 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [982912563] [2021-11-23 03:09:42,106 INFO L159 IcfgInterpreter]: Started Sifa with 43 locations of interest [2021-11-23 03:09:42,106 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 03:09:42,106 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 03:09:42,107 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 03:09:42,107 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-23 03:09:57,596 INFO L197 IcfgInterpreter]: Interpreting procedure error1 with input of size 183 for LOIs [2021-11-23 03:09:57,643 INFO L197 IcfgInterpreter]: Interpreting procedure exists_runnable_thread1 with input of size 139 for LOIs [2021-11-23 03:09:57,675 INFO L197 IcfgInterpreter]: Interpreting procedure immediate_notify_threads with input of size 185 for LOIs [2021-11-23 03:09:58,165 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-23 03:10:29,366 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '20277#(and (= ~t5_i~0 0) (= 0 ~t5_pc~0) (= ~E_4~0 2) (= ~t1_pc~0 0) (= ~T4_E~0 2) (= 0 ~t4_st~0) (= ~T1_E~0 2) (= ~T5_E~0 2) (<= 0 ~p_dw_pc~0) (= ~m_st~0 0) (= ~E_5~0 2) (= ~q_free~0 1) (<= 0 ~p_num_write~0) (= ~T2_E~0 2) (= 1 ~c_dr_i~0) (= 0 ~t5_st~0) (= ~E_3~0 2) (= 0 ~t3_pc~0) (= ~t2_i~0 0) (= ~t4_i~0 0) (= ~c_dr_pc~0 1) (= ~t1_st~0 0) (= ~c_num_read~0 1) (= ~m_i~0 0) (not (= ~c_num_read~0 ~p_num_write~0)) (= ~q_write_ev~0 2) (= ~E_2~0 2) (= ~c_last_read~0 ~q_buf_0~0) (= ~T3_E~0 2) (= ~local~0 0) (= ~t3_i~0 0) (= ~token~0 0) (= ~q_read_ev~0 2) (= ~m_pc~0 0) (= ~p_dw_i~0 1) (= 0 ~t2_pc~0) (= |#NULL.offset| 0) (= ~c_last_read~0 ~p_last_write~0) (= ~E_M~0 2) (= 0 ~t2_st~0) (= 0 ~t4_pc~0) (= ~E_1~0 2) (= 0 ~t3_st~0) (= ~M_E~0 2) (<= 0 |#StackHeapBarrier|) (= ~t1_i~0 0) (= |#NULL.base| 0))' at error location [2021-11-23 03:10:29,366 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-23 03:10:29,367 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-23 03:10:29,367 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 4] total 7 [2021-11-23 03:10:29,367 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [785391924] [2021-11-23 03:10:29,367 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-23 03:10:29,367 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-23 03:10:29,368 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:10:29,368 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-23 03:10:29,369 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=135, Invalid=1757, Unknown=0, NotChecked=0, Total=1892 [2021-11-23 03:10:29,369 INFO L87 Difference]: Start difference. First operand 429 states and 559 transitions. Second operand has 7 states, 7 states have (on average 13.0) internal successors, (91), 7 states have internal predecessors, (91), 6 states have call successors, (9), 5 states have call predecessors, (9), 4 states have return successors, (8), 5 states have call predecessors, (8), 5 states have call successors, (8) [2021-11-23 03:10:29,759 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:10:29,760 INFO L93 Difference]: Finished difference Result 667 states and 835 transitions. [2021-11-23 03:10:29,760 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-23 03:10:29,761 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 13.0) internal successors, (91), 7 states have internal predecessors, (91), 6 states have call successors, (9), 5 states have call predecessors, (9), 4 states have return successors, (8), 5 states have call predecessors, (8), 5 states have call successors, (8) Word has length 62 [2021-11-23 03:10:29,761 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:10:29,766 INFO L225 Difference]: With dead ends: 667 [2021-11-23 03:10:29,766 INFO L226 Difference]: Without dead ends: 664 [2021-11-23 03:10:29,768 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 189 GetRequests, 145 SyntacticMatches, 2 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 493 ImplicationChecksByTransitivity, 31.2s TimeCoverageRelationStatistics Valid=135, Invalid=1757, Unknown=0, NotChecked=0, Total=1892 [2021-11-23 03:10:29,769 INFO L933 BasicCegarLoop]: 251 mSDtfsCounter, 316 mSDsluCounter, 585 mSDsCounter, 0 mSdLazyCounter, 318 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 316 SdHoareTripleChecker+Valid, 737 SdHoareTripleChecker+Invalid, 327 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 318 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-23 03:10:29,769 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [316 Valid, 737 Invalid, 327 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 318 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-23 03:10:29,771 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 664 states. [2021-11-23 03:10:29,840 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 664 to 532. [2021-11-23 03:10:29,842 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 532 states, 430 states have (on average 1.2790697674418605) internal successors, (550), 438 states have internal predecessors, (550), 67 states have call successors, (67), 35 states have call predecessors, (67), 33 states have return successors, (64), 59 states have call predecessors, (64), 64 states have call successors, (64) [2021-11-23 03:10:29,846 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 532 states to 532 states and 681 transitions. [2021-11-23 03:10:29,846 INFO L78 Accepts]: Start accepts. Automaton has 532 states and 681 transitions. Word has length 62 [2021-11-23 03:10:29,847 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:10:29,847 INFO L470 AbstractCegarLoop]: Abstraction has 532 states and 681 transitions. [2021-11-23 03:10:29,847 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 13.0) internal successors, (91), 7 states have internal predecessors, (91), 6 states have call successors, (9), 5 states have call predecessors, (9), 4 states have return successors, (8), 5 states have call predecessors, (8), 5 states have call successors, (8) [2021-11-23 03:10:29,847 INFO L276 IsEmpty]: Start isEmpty. Operand 532 states and 681 transitions. [2021-11-23 03:10:29,849 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2021-11-23 03:10:29,850 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:10:29,850 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:10:29,888 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_094b7207-5913-40c5-a95b-0c93f54561b9/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-23 03:10:30,063 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_094b7207-5913-40c5-a95b-0c93f54561b9/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:10:30,063 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting error1Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:10:30,064 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:10:30,064 INFO L85 PathProgramCache]: Analyzing trace with hash -609506300, now seen corresponding path program 2 times [2021-11-23 03:10:30,064 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:10:30,064 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1762283317] [2021-11-23 03:10:30,064 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:10:30,064 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:10:30,087 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:10:30,116 INFO L134 CoverageAnalysis]: Checked inductivity of 42 backedges. 12 proven. 0 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2021-11-23 03:10:30,116 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:10:30,116 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1762283317] [2021-11-23 03:10:30,116 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1762283317] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:10:30,117 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 03:10:30,117 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 03:10:30,117 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [977308838] [2021-11-23 03:10:30,117 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:10:30,118 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 03:10:30,118 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:10:30,118 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 03:10:30,118 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 03:10:30,119 INFO L87 Difference]: Start difference. First operand 532 states and 681 transitions. Second operand has 3 states, 3 states have (on average 16.0) internal successors, (48), 3 states have internal predecessors, (48), 3 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) [2021-11-23 03:10:30,226 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:10:30,226 INFO L93 Difference]: Finished difference Result 664 states and 834 transitions. [2021-11-23 03:10:30,226 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 03:10:30,227 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 16.0) internal successors, (48), 3 states have internal predecessors, (48), 3 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) Word has length 75 [2021-11-23 03:10:30,227 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:10:30,229 INFO L225 Difference]: With dead ends: 664 [2021-11-23 03:10:30,229 INFO L226 Difference]: Without dead ends: 211 [2021-11-23 03:10:30,232 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 03:10:30,234 INFO L933 BasicCegarLoop]: 211 mSDtfsCounter, 205 mSDsluCounter, 46 mSDsCounter, 0 mSdLazyCounter, 49 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 205 SdHoareTripleChecker+Valid, 252 SdHoareTripleChecker+Invalid, 50 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 49 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 03:10:30,235 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [205 Valid, 252 Invalid, 50 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 49 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 03:10:30,236 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 211 states. [2021-11-23 03:10:30,249 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 211 to 211. [2021-11-23 03:10:30,250 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 211 states, 162 states have (on average 1.4506172839506173) internal successors, (235), 165 states have internal predecessors, (235), 36 states have call successors, (36), 13 states have call predecessors, (36), 12 states have return successors, (34), 33 states have call predecessors, (34), 34 states have call successors, (34) [2021-11-23 03:10:30,251 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 211 states to 211 states and 305 transitions. [2021-11-23 03:10:30,252 INFO L78 Accepts]: Start accepts. Automaton has 211 states and 305 transitions. Word has length 75 [2021-11-23 03:10:30,252 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:10:30,252 INFO L470 AbstractCegarLoop]: Abstraction has 211 states and 305 transitions. [2021-11-23 03:10:30,252 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 16.0) internal successors, (48), 3 states have internal predecessors, (48), 3 states have call successors, (5), 2 states have call predecessors, (5), 1 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) [2021-11-23 03:10:30,253 INFO L276 IsEmpty]: Start isEmpty. Operand 211 states and 305 transitions. [2021-11-23 03:10:30,254 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2021-11-23 03:10:30,254 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:10:30,254 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:10:30,255 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2021-11-23 03:10:30,255 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:10:30,255 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:10:30,255 INFO L85 PathProgramCache]: Analyzing trace with hash 489778761, now seen corresponding path program 1 times [2021-11-23 03:10:30,255 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:10:30,256 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1656464932] [2021-11-23 03:10:30,256 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:10:30,256 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:10:30,269 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:10:30,306 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-23 03:10:30,306 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:10:30,307 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1656464932] [2021-11-23 03:10:30,307 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1656464932] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:10:30,307 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [827110237] [2021-11-23 03:10:30,307 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:10:30,307 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:10:30,307 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_094b7207-5913-40c5-a95b-0c93f54561b9/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:10:30,308 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_094b7207-5913-40c5-a95b-0c93f54561b9/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:10:30,327 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_094b7207-5913-40c5-a95b-0c93f54561b9/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-23 03:10:30,441 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:10:30,444 INFO L263 TraceCheckSpWp]: Trace formula consists of 573 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 03:10:30,448 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:10:30,611 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 17 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-23 03:10:30,611 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 03:10:30,612 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [827110237] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:10:30,612 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 03:10:30,612 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2021-11-23 03:10:30,613 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [182440331] [2021-11-23 03:10:30,613 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:10:30,613 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 03:10:30,614 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:10:30,614 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 03:10:30,614 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-23 03:10:30,615 INFO L87 Difference]: Start difference. First operand 211 states and 305 transitions. Second operand has 3 states, 3 states have (on average 21.0) internal successors, (63), 2 states have internal predecessors, (63), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-23 03:10:30,720 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:10:30,721 INFO L93 Difference]: Finished difference Result 614 states and 902 transitions. [2021-11-23 03:10:30,721 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 03:10:30,721 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 21.0) internal successors, (63), 2 states have internal predecessors, (63), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 88 [2021-11-23 03:10:30,722 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:10:30,725 INFO L225 Difference]: With dead ends: 614 [2021-11-23 03:10:30,726 INFO L226 Difference]: Without dead ends: 409 [2021-11-23 03:10:30,727 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 92 GetRequests, 88 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-23 03:10:30,728 INFO L933 BasicCegarLoop]: 183 mSDtfsCounter, 134 mSDsluCounter, 150 mSDsCounter, 0 mSdLazyCounter, 65 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 134 SdHoareTripleChecker+Valid, 310 SdHoareTripleChecker+Invalid, 67 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 65 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 03:10:30,728 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [134 Valid, 310 Invalid, 67 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 65 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 03:10:30,730 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 409 states. [2021-11-23 03:10:30,778 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 409 to 403. [2021-11-23 03:10:30,779 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 403 states, 314 states have (on average 1.4458598726114649) internal successors, (454), 318 states have internal predecessors, (454), 64 states have call successors, (64), 25 states have call predecessors, (64), 24 states have return successors, (62), 60 states have call predecessors, (62), 62 states have call successors, (62) [2021-11-23 03:10:30,783 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 403 states to 403 states and 580 transitions. [2021-11-23 03:10:30,783 INFO L78 Accepts]: Start accepts. Automaton has 403 states and 580 transitions. Word has length 88 [2021-11-23 03:10:30,784 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:10:30,784 INFO L470 AbstractCegarLoop]: Abstraction has 403 states and 580 transitions. [2021-11-23 03:10:30,784 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 21.0) internal successors, (63), 2 states have internal predecessors, (63), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-23 03:10:30,784 INFO L276 IsEmpty]: Start isEmpty. Operand 403 states and 580 transitions. [2021-11-23 03:10:30,786 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2021-11-23 03:10:30,787 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:10:30,787 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:10:30,832 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_094b7207-5913-40c5-a95b-0c93f54561b9/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-23 03:10:31,000 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_094b7207-5913-40c5-a95b-0c93f54561b9/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2021-11-23 03:10:31,000 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:10:31,000 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:10:31,000 INFO L85 PathProgramCache]: Analyzing trace with hash -1346678137, now seen corresponding path program 1 times [2021-11-23 03:10:31,001 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:10:31,001 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1734731250] [2021-11-23 03:10:31,001 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:10:31,001 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:10:31,014 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:10:31,052 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-23 03:10:31,053 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:10:31,053 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1734731250] [2021-11-23 03:10:31,053 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1734731250] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:10:31,053 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [510200964] [2021-11-23 03:10:31,053 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:10:31,054 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:10:31,054 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_094b7207-5913-40c5-a95b-0c93f54561b9/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:10:31,055 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_094b7207-5913-40c5-a95b-0c93f54561b9/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:10:31,078 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_094b7207-5913-40c5-a95b-0c93f54561b9/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-23 03:10:31,213 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:10:31,216 INFO L263 TraceCheckSpWp]: Trace formula consists of 567 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 03:10:31,219 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:10:31,368 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-11-23 03:10:31,369 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 03:10:31,369 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [510200964] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:10:31,369 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 03:10:31,369 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2021-11-23 03:10:31,371 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [588867300] [2021-11-23 03:10:31,372 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:10:31,372 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 03:10:31,373 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:10:31,373 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 03:10:31,373 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-23 03:10:31,374 INFO L87 Difference]: Start difference. First operand 403 states and 580 transitions. Second operand has 3 states, 3 states have (on average 18.0) internal successors, (54), 2 states have internal predecessors, (54), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-23 03:10:31,506 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:10:31,506 INFO L93 Difference]: Finished difference Result 1184 states and 1731 transitions. [2021-11-23 03:10:31,507 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 03:10:31,507 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 18.0) internal successors, (54), 2 states have internal predecessors, (54), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 88 [2021-11-23 03:10:31,508 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:10:31,514 INFO L225 Difference]: With dead ends: 1184 [2021-11-23 03:10:31,515 INFO L226 Difference]: Without dead ends: 787 [2021-11-23 03:10:31,517 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 92 GetRequests, 88 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-23 03:10:31,518 INFO L933 BasicCegarLoop]: 182 mSDtfsCounter, 143 mSDsluCounter, 150 mSDsCounter, 0 mSdLazyCounter, 65 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 143 SdHoareTripleChecker+Valid, 309 SdHoareTripleChecker+Invalid, 67 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 65 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 03:10:31,518 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [143 Valid, 309 Invalid, 67 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 65 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 03:10:31,520 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 787 states. [2021-11-23 03:10:31,576 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 787 to 779. [2021-11-23 03:10:31,578 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 779 states, 612 states have (on average 1.4379084967320261) internal successors, (880), 618 states have internal predecessors, (880), 118 states have call successors, (118), 49 states have call predecessors, (118), 48 states have return successors, (116), 112 states have call predecessors, (116), 116 states have call successors, (116) [2021-11-23 03:10:31,585 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 779 states to 779 states and 1114 transitions. [2021-11-23 03:10:31,585 INFO L78 Accepts]: Start accepts. Automaton has 779 states and 1114 transitions. Word has length 88 [2021-11-23 03:10:31,585 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:10:31,586 INFO L470 AbstractCegarLoop]: Abstraction has 779 states and 1114 transitions. [2021-11-23 03:10:31,586 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 18.0) internal successors, (54), 2 states have internal predecessors, (54), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-23 03:10:31,586 INFO L276 IsEmpty]: Start isEmpty. Operand 779 states and 1114 transitions. [2021-11-23 03:10:31,588 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2021-11-23 03:10:31,589 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:10:31,589 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:10:31,627 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_094b7207-5913-40c5-a95b-0c93f54561b9/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-11-23 03:10:31,807 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_094b7207-5913-40c5-a95b-0c93f54561b9/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2021-11-23 03:10:31,808 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:10:31,808 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:10:31,808 INFO L85 PathProgramCache]: Analyzing trace with hash 2044417033, now seen corresponding path program 1 times [2021-11-23 03:10:31,808 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:10:31,808 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1766780841] [2021-11-23 03:10:31,808 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:10:31,809 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:10:31,825 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:10:31,869 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2021-11-23 03:10:31,869 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:10:31,870 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1766780841] [2021-11-23 03:10:31,870 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1766780841] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:10:31,870 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [764919859] [2021-11-23 03:10:31,870 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:10:31,870 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:10:31,870 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_094b7207-5913-40c5-a95b-0c93f54561b9/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:10:31,871 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_094b7207-5913-40c5-a95b-0c93f54561b9/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:10:31,893 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_094b7207-5913-40c5-a95b-0c93f54561b9/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-11-23 03:10:32,003 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:10:32,006 INFO L263 TraceCheckSpWp]: Trace formula consists of 561 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 03:10:32,009 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:10:32,159 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 14 proven. 0 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-23 03:10:32,159 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 03:10:32,159 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [764919859] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:10:32,159 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 03:10:32,160 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5] total 6 [2021-11-23 03:10:32,160 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1379474172] [2021-11-23 03:10:32,160 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:10:32,161 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 03:10:32,161 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:10:32,162 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 03:10:32,162 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-23 03:10:32,162 INFO L87 Difference]: Start difference. First operand 779 states and 1114 transitions. Second operand has 3 states, 3 states have (on average 20.0) internal successors, (60), 2 states have internal predecessors, (60), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-23 03:10:32,323 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:10:32,323 INFO L93 Difference]: Finished difference Result 2300 states and 3339 transitions. [2021-11-23 03:10:32,324 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 03:10:32,324 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 20.0) internal successors, (60), 2 states have internal predecessors, (60), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 88 [2021-11-23 03:10:32,324 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:10:32,336 INFO L225 Difference]: With dead ends: 2300 [2021-11-23 03:10:32,336 INFO L226 Difference]: Without dead ends: 1527 [2021-11-23 03:10:32,340 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 92 GetRequests, 88 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-23 03:10:32,341 INFO L933 BasicCegarLoop]: 150 mSDtfsCounter, 137 mSDsluCounter, 150 mSDsCounter, 0 mSdLazyCounter, 61 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 137 SdHoareTripleChecker+Valid, 277 SdHoareTripleChecker+Invalid, 63 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 61 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 03:10:32,341 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [137 Valid, 277 Invalid, 63 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 61 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 03:10:32,344 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1527 states. [2021-11-23 03:10:32,443 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1527 to 1515. [2021-11-23 03:10:32,447 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1515 states, 1196 states have (on average 1.4280936454849498) internal successors, (1708), 1206 states have internal predecessors, (1708), 222 states have call successors, (222), 97 states have call predecessors, (222), 96 states have return successors, (220), 212 states have call predecessors, (220), 220 states have call successors, (220) [2021-11-23 03:10:32,459 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1515 states to 1515 states and 2150 transitions. [2021-11-23 03:10:32,459 INFO L78 Accepts]: Start accepts. Automaton has 1515 states and 2150 transitions. Word has length 88 [2021-11-23 03:10:32,460 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:10:32,460 INFO L470 AbstractCegarLoop]: Abstraction has 1515 states and 2150 transitions. [2021-11-23 03:10:32,460 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 20.0) internal successors, (60), 2 states have internal predecessors, (60), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-23 03:10:32,461 INFO L276 IsEmpty]: Start isEmpty. Operand 1515 states and 2150 transitions. [2021-11-23 03:10:32,464 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2021-11-23 03:10:32,465 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:10:32,465 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:10:32,513 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_094b7207-5913-40c5-a95b-0c93f54561b9/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-11-23 03:10:32,689 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_094b7207-5913-40c5-a95b-0c93f54561b9/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2021-11-23 03:10:32,689 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:10:32,689 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:10:32,690 INFO L85 PathProgramCache]: Analyzing trace with hash 1450385163, now seen corresponding path program 1 times [2021-11-23 03:10:32,690 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:10:32,690 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1237233075] [2021-11-23 03:10:32,690 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:10:32,690 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:10:32,717 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:10:32,752 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2021-11-23 03:10:32,752 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:10:32,752 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1237233075] [2021-11-23 03:10:32,753 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1237233075] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:10:32,753 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 03:10:32,753 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 03:10:32,753 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2054032810] [2021-11-23 03:10:32,754 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:10:32,754 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 03:10:32,754 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:10:32,755 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 03:10:32,755 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 03:10:32,755 INFO L87 Difference]: Start difference. First operand 1515 states and 2150 transitions. Second operand has 3 states, 3 states have (on average 17.0) internal successors, (51), 3 states have internal predecessors, (51), 3 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) [2021-11-23 03:10:32,956 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:10:32,956 INFO L93 Difference]: Finished difference Result 2695 states and 3881 transitions. [2021-11-23 03:10:32,957 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 03:10:32,957 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 17.0) internal successors, (51), 3 states have internal predecessors, (51), 3 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) Word has length 88 [2021-11-23 03:10:32,958 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:10:32,976 INFO L225 Difference]: With dead ends: 2695 [2021-11-23 03:10:32,976 INFO L226 Difference]: Without dead ends: 1907 [2021-11-23 03:10:32,981 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 03:10:32,982 INFO L933 BasicCegarLoop]: 204 mSDtfsCounter, 64 mSDsluCounter, 166 mSDsCounter, 0 mSdLazyCounter, 74 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 64 SdHoareTripleChecker+Valid, 346 SdHoareTripleChecker+Invalid, 74 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 74 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 03:10:32,982 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [64 Valid, 346 Invalid, 74 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 74 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 03:10:32,985 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1907 states. [2021-11-23 03:10:33,122 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1907 to 1759. [2021-11-23 03:10:33,128 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1759 states, 1424 states have (on average 1.4691011235955056) internal successors, (2092), 1434 states have internal predecessors, (2092), 230 states have call successors, (230), 105 states have call predecessors, (230), 104 states have return successors, (228), 220 states have call predecessors, (228), 228 states have call successors, (228) [2021-11-23 03:10:33,139 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1759 states to 1759 states and 2550 transitions. [2021-11-23 03:10:33,140 INFO L78 Accepts]: Start accepts. Automaton has 1759 states and 2550 transitions. Word has length 88 [2021-11-23 03:10:33,140 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:10:33,140 INFO L470 AbstractCegarLoop]: Abstraction has 1759 states and 2550 transitions. [2021-11-23 03:10:33,140 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 17.0) internal successors, (51), 3 states have internal predecessors, (51), 3 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) [2021-11-23 03:10:33,141 INFO L276 IsEmpty]: Start isEmpty. Operand 1759 states and 2550 transitions. [2021-11-23 03:10:33,148 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 118 [2021-11-23 03:10:33,149 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:10:33,149 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:10:33,149 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2021-11-23 03:10:33,150 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:10:33,151 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:10:33,151 INFO L85 PathProgramCache]: Analyzing trace with hash 2018817391, now seen corresponding path program 1 times [2021-11-23 03:10:33,151 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:10:33,151 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [508327354] [2021-11-23 03:10:33,152 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:10:33,152 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:10:33,183 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:10:33,253 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 63 trivial. 0 not checked. [2021-11-23 03:10:33,253 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:10:33,253 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [508327354] [2021-11-23 03:10:33,254 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [508327354] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:10:33,254 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 03:10:33,254 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 03:10:33,254 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1875536742] [2021-11-23 03:10:33,254 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:10:33,255 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 03:10:33,255 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:10:33,256 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 03:10:33,256 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 03:10:33,256 INFO L87 Difference]: Start difference. First operand 1759 states and 2550 transitions. Second operand has 3 states, 3 states have (on average 19.333333333333332) internal successors, (58), 3 states have internal predecessors, (58), 3 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2021-11-23 03:10:33,558 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:10:33,559 INFO L93 Difference]: Finished difference Result 5192 states and 7607 transitions. [2021-11-23 03:10:33,559 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 03:10:33,560 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 19.333333333333332) internal successors, (58), 3 states have internal predecessors, (58), 3 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) Word has length 117 [2021-11-23 03:10:33,560 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:10:33,588 INFO L225 Difference]: With dead ends: 5192 [2021-11-23 03:10:33,589 INFO L226 Difference]: Without dead ends: 3439 [2021-11-23 03:10:33,597 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 03:10:33,598 INFO L933 BasicCegarLoop]: 152 mSDtfsCounter, 135 mSDsluCounter, 150 mSDsCounter, 0 mSdLazyCounter, 59 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 135 SdHoareTripleChecker+Valid, 279 SdHoareTripleChecker+Invalid, 61 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 59 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 03:10:33,598 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [135 Valid, 279 Invalid, 61 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 59 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 03:10:33,603 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3439 states. [2021-11-23 03:10:33,842 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3439 to 3411. [2021-11-23 03:10:33,852 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3411 states, 2764 states have (on average 1.4544138929088277) internal successors, (4020), 2782 states have internal predecessors, (4020), 438 states have call successors, (438), 209 states have call predecessors, (438), 208 states have return successors, (436), 420 states have call predecessors, (436), 436 states have call successors, (436) [2021-11-23 03:10:33,872 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3411 states to 3411 states and 4894 transitions. [2021-11-23 03:10:33,873 INFO L78 Accepts]: Start accepts. Automaton has 3411 states and 4894 transitions. Word has length 117 [2021-11-23 03:10:33,874 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:10:33,874 INFO L470 AbstractCegarLoop]: Abstraction has 3411 states and 4894 transitions. [2021-11-23 03:10:33,874 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 19.333333333333332) internal successors, (58), 3 states have internal predecessors, (58), 3 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2021-11-23 03:10:33,874 INFO L276 IsEmpty]: Start isEmpty. Operand 3411 states and 4894 transitions. [2021-11-23 03:10:33,888 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 118 [2021-11-23 03:10:33,888 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:10:33,889 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:10:33,889 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19 [2021-11-23 03:10:33,889 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:10:33,890 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:10:33,890 INFO L85 PathProgramCache]: Analyzing trace with hash 620489134, now seen corresponding path program 1 times [2021-11-23 03:10:33,890 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:10:33,890 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [238335394] [2021-11-23 03:10:33,891 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:10:33,891 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:10:33,916 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:10:33,953 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 63 trivial. 0 not checked. [2021-11-23 03:10:33,954 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:10:33,954 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [238335394] [2021-11-23 03:10:33,954 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [238335394] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:10:33,954 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 03:10:33,955 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 03:10:33,955 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [396922775] [2021-11-23 03:10:33,955 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:10:33,955 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 03:10:33,956 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:10:33,956 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 03:10:33,956 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 03:10:33,957 INFO L87 Difference]: Start difference. First operand 3411 states and 4894 transitions. Second operand has 3 states, 3 states have (on average 19.333333333333332) internal successors, (58), 3 states have internal predecessors, (58), 3 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2021-11-23 03:10:34,470 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:10:34,471 INFO L93 Difference]: Finished difference Result 10076 states and 14599 transitions. [2021-11-23 03:10:34,471 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 03:10:34,471 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 19.333333333333332) internal successors, (58), 3 states have internal predecessors, (58), 3 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) Word has length 117 [2021-11-23 03:10:34,472 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:10:34,528 INFO L225 Difference]: With dead ends: 10076 [2021-11-23 03:10:34,528 INFO L226 Difference]: Without dead ends: 6671 [2021-11-23 03:10:34,543 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 03:10:34,544 INFO L933 BasicCegarLoop]: 167 mSDtfsCounter, 137 mSDsluCounter, 150 mSDsCounter, 0 mSdLazyCounter, 60 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 137 SdHoareTripleChecker+Valid, 294 SdHoareTripleChecker+Invalid, 62 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 60 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 03:10:34,545 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [137 Valid, 294 Invalid, 62 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 60 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 03:10:34,554 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6671 states. [2021-11-23 03:10:35,018 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6671 to 6619. [2021-11-23 03:10:35,045 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 6619 states, 5364 states have (on average 1.4384787472035794) internal successors, (7716), 5398 states have internal predecessors, (7716), 838 states have call successors, (838), 417 states have call predecessors, (838), 416 states have return successors, (836), 804 states have call predecessors, (836), 836 states have call successors, (836) [2021-11-23 03:10:35,086 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6619 states to 6619 states and 9390 transitions. [2021-11-23 03:10:35,087 INFO L78 Accepts]: Start accepts. Automaton has 6619 states and 9390 transitions. Word has length 117 [2021-11-23 03:10:35,088 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:10:35,088 INFO L470 AbstractCegarLoop]: Abstraction has 6619 states and 9390 transitions. [2021-11-23 03:10:35,089 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 19.333333333333332) internal successors, (58), 3 states have internal predecessors, (58), 3 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2021-11-23 03:10:35,089 INFO L276 IsEmpty]: Start isEmpty. Operand 6619 states and 9390 transitions. [2021-11-23 03:10:35,124 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 136 [2021-11-23 03:10:35,124 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:10:35,124 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:10:35,125 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20 [2021-11-23 03:10:35,125 INFO L402 AbstractCegarLoop]: === Iteration 22 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:10:35,125 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:10:35,126 INFO L85 PathProgramCache]: Analyzing trace with hash -310361348, now seen corresponding path program 1 times [2021-11-23 03:10:35,126 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:10:35,128 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [4420655] [2021-11-23 03:10:35,128 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:10:35,128 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:10:35,154 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:10:35,192 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 25 proven. 0 refuted. 0 times theorem prover too weak. 65 trivial. 0 not checked. [2021-11-23 03:10:35,192 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:10:35,193 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [4420655] [2021-11-23 03:10:35,193 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [4420655] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:10:35,193 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 03:10:35,193 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 03:10:35,193 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1833162189] [2021-11-23 03:10:35,194 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:10:35,194 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 03:10:35,194 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:10:35,195 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 03:10:35,195 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 03:10:35,195 INFO L87 Difference]: Start difference. First operand 6619 states and 9390 transitions. Second operand has 3 states, 3 states have (on average 25.0) internal successors, (75), 3 states have internal predecessors, (75), 3 states have call successors, (11), 2 states have call predecessors, (11), 1 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) [2021-11-23 03:10:35,875 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:10:35,875 INFO L93 Difference]: Finished difference Result 17411 states and 25108 transitions. [2021-11-23 03:10:35,876 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 03:10:35,876 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 25.0) internal successors, (75), 3 states have internal predecessors, (75), 3 states have call successors, (11), 2 states have call predecessors, (11), 1 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) Word has length 135 [2021-11-23 03:10:35,877 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:10:35,960 INFO L225 Difference]: With dead ends: 17411 [2021-11-23 03:10:35,961 INFO L226 Difference]: Without dead ends: 10799 [2021-11-23 03:10:35,988 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 03:10:35,989 INFO L933 BasicCegarLoop]: 182 mSDtfsCounter, 82 mSDsluCounter, 162 mSDsCounter, 0 mSdLazyCounter, 63 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 82 SdHoareTripleChecker+Valid, 322 SdHoareTripleChecker+Invalid, 66 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 63 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 03:10:35,990 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [82 Valid, 322 Invalid, 66 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 63 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 03:10:36,007 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 10799 states. [2021-11-23 03:10:36,833 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 10799 to 9139. [2021-11-23 03:10:36,849 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 9139 states, 7688 states have (on average 1.5036420395421437) internal successors, (11560), 7723 states have internal predecessors, (11560), 936 states have call successors, (936), 515 states have call predecessors, (936), 514 states have return successors, (934), 901 states have call predecessors, (934), 934 states have call successors, (934) [2021-11-23 03:10:36,892 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9139 states to 9139 states and 13430 transitions. [2021-11-23 03:10:36,894 INFO L78 Accepts]: Start accepts. Automaton has 9139 states and 13430 transitions. Word has length 135 [2021-11-23 03:10:36,895 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:10:36,895 INFO L470 AbstractCegarLoop]: Abstraction has 9139 states and 13430 transitions. [2021-11-23 03:10:36,895 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 25.0) internal successors, (75), 3 states have internal predecessors, (75), 3 states have call successors, (11), 2 states have call predecessors, (11), 1 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) [2021-11-23 03:10:36,895 INFO L276 IsEmpty]: Start isEmpty. Operand 9139 states and 13430 transitions. [2021-11-23 03:10:36,930 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 136 [2021-11-23 03:10:36,930 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:10:36,930 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:10:36,930 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21 [2021-11-23 03:10:36,931 INFO L402 AbstractCegarLoop]: === Iteration 23 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:10:36,931 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:10:36,931 INFO L85 PathProgramCache]: Analyzing trace with hash 280226546, now seen corresponding path program 2 times [2021-11-23 03:10:36,931 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:10:36,932 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [704068936] [2021-11-23 03:10:36,932 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:10:36,932 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:10:36,972 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:10:37,043 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 20 proven. 5 refuted. 0 times theorem prover too weak. 65 trivial. 0 not checked. [2021-11-23 03:10:37,044 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:10:37,044 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [704068936] [2021-11-23 03:10:37,044 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [704068936] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:10:37,044 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1845527198] [2021-11-23 03:10:37,045 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 03:10:37,045 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:10:37,045 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_094b7207-5913-40c5-a95b-0c93f54561b9/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:10:37,049 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_094b7207-5913-40c5-a95b-0c93f54561b9/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:10:37,052 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_094b7207-5913-40c5-a95b-0c93f54561b9/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-11-23 03:10:37,252 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-11-23 03:10:37,253 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 03:10:37,257 INFO L263 TraceCheckSpWp]: Trace formula consists of 744 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 03:10:37,260 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:10:37,510 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 70 proven. 0 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2021-11-23 03:10:37,510 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 03:10:37,510 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1845527198] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:10:37,510 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 03:10:37,511 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [5] total 6 [2021-11-23 03:10:37,511 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1508908255] [2021-11-23 03:10:37,511 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:10:37,514 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 03:10:37,514 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:10:37,515 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 03:10:37,515 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-11-23 03:10:37,515 INFO L87 Difference]: Start difference. First operand 9139 states and 13430 transitions. Second operand has 3 states, 3 states have (on average 31.0) internal successors, (93), 3 states have internal predecessors, (93), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2021-11-23 03:10:38,264 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:10:38,264 INFO L93 Difference]: Finished difference Result 17403 states and 25788 transitions. [2021-11-23 03:10:38,265 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 03:10:38,265 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 31.0) internal successors, (93), 3 states have internal predecessors, (93), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) Word has length 135 [2021-11-23 03:10:38,266 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:10:38,334 INFO L225 Difference]: With dead ends: 17403 [2021-11-23 03:10:38,335 INFO L226 Difference]: Without dead ends: 12743 [2021-11-23 03:10:38,353 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 139 GetRequests, 135 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-11-23 03:10:38,353 INFO L933 BasicCegarLoop]: 228 mSDtfsCounter, 103 mSDsluCounter, 167 mSDsCounter, 0 mSdLazyCounter, 77 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 103 SdHoareTripleChecker+Valid, 372 SdHoareTripleChecker+Invalid, 77 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 77 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 03:10:38,354 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [103 Valid, 372 Invalid, 77 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 77 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 03:10:38,372 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12743 states. [2021-11-23 03:10:39,245 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12743 to 11459. [2021-11-23 03:10:39,266 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 11459 states, 9816 states have (on average 1.5297473512632438) internal successors, (15016), 9851 states have internal predecessors, (15016), 1032 states have call successors, (1032), 611 states have call predecessors, (1032), 610 states have return successors, (1030), 997 states have call predecessors, (1030), 1030 states have call successors, (1030) [2021-11-23 03:10:39,311 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11459 states to 11459 states and 17078 transitions. [2021-11-23 03:10:39,314 INFO L78 Accepts]: Start accepts. Automaton has 11459 states and 17078 transitions. Word has length 135 [2021-11-23 03:10:39,314 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:10:39,314 INFO L470 AbstractCegarLoop]: Abstraction has 11459 states and 17078 transitions. [2021-11-23 03:10:39,315 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 31.0) internal successors, (93), 3 states have internal predecessors, (93), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2021-11-23 03:10:39,315 INFO L276 IsEmpty]: Start isEmpty. Operand 11459 states and 17078 transitions. [2021-11-23 03:10:39,356 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 136 [2021-11-23 03:10:39,356 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:10:39,357 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:10:39,399 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_094b7207-5913-40c5-a95b-0c93f54561b9/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2021-11-23 03:10:39,573 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_094b7207-5913-40c5-a95b-0c93f54561b9/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:10:39,573 INFO L402 AbstractCegarLoop]: === Iteration 24 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:10:39,574 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:10:39,574 INFO L85 PathProgramCache]: Analyzing trace with hash 744789153, now seen corresponding path program 3 times [2021-11-23 03:10:39,574 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:10:39,574 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1184041031] [2021-11-23 03:10:39,574 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:10:39,574 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:10:39,607 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:10:39,686 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 10 proven. 37 refuted. 0 times theorem prover too weak. 43 trivial. 0 not checked. [2021-11-23 03:10:39,686 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:10:39,687 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1184041031] [2021-11-23 03:10:39,687 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1184041031] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:10:39,687 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1723001912] [2021-11-23 03:10:39,687 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-23 03:10:39,687 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:10:39,688 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_094b7207-5913-40c5-a95b-0c93f54561b9/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:10:39,688 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_094b7207-5913-40c5-a95b-0c93f54561b9/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:10:39,709 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_094b7207-5913-40c5-a95b-0c93f54561b9/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-11-23 03:10:39,834 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-23 03:10:39,834 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 03:10:39,837 INFO L263 TraceCheckSpWp]: Trace formula consists of 442 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-23 03:10:39,841 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:10:40,109 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 63 proven. 0 refuted. 0 times theorem prover too weak. 27 trivial. 0 not checked. [2021-11-23 03:10:40,109 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 03:10:40,109 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1723001912] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:10:40,109 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 03:10:40,110 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 7 [2021-11-23 03:10:40,110 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1500498243] [2021-11-23 03:10:40,110 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:10:40,111 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 03:10:40,111 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:10:40,111 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 03:10:40,112 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-11-23 03:10:40,112 INFO L87 Difference]: Start difference. First operand 11459 states and 17078 transitions. Second operand has 3 states, 3 states have (on average 30.333333333333332) internal successors, (91), 3 states have internal predecessors, (91), 3 states have call successors, (11), 3 states have call predecessors, (11), 2 states have return successors, (10), 2 states have call predecessors, (10), 3 states have call successors, (10) [2021-11-23 03:10:40,923 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:10:40,923 INFO L93 Difference]: Finished difference Result 17339 states and 26108 transitions. [2021-11-23 03:10:40,924 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 03:10:40,924 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 30.333333333333332) internal successors, (91), 3 states have internal predecessors, (91), 3 states have call successors, (11), 3 states have call predecessors, (11), 2 states have return successors, (10), 2 states have call predecessors, (10), 3 states have call successors, (10) Word has length 135 [2021-11-23 03:10:40,925 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:10:40,980 INFO L225 Difference]: With dead ends: 17339 [2021-11-23 03:10:40,980 INFO L226 Difference]: Without dead ends: 11495 [2021-11-23 03:10:41,003 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 142 GetRequests, 137 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-11-23 03:10:41,006 INFO L933 BasicCegarLoop]: 243 mSDtfsCounter, 140 mSDsluCounter, 155 mSDsCounter, 0 mSdLazyCounter, 81 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 140 SdHoareTripleChecker+Valid, 373 SdHoareTripleChecker+Invalid, 83 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 81 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 03:10:41,006 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [140 Valid, 373 Invalid, 83 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 81 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 03:10:41,023 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 11495 states. [2021-11-23 03:10:41,842 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 11495 to 11379. [2021-11-23 03:10:41,857 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 11379 states, 9736 states have (on average 1.516023007395234) internal successors, (14760), 9771 states have internal predecessors, (14760), 1032 states have call successors, (1032), 611 states have call predecessors, (1032), 610 states have return successors, (1030), 997 states have call predecessors, (1030), 1030 states have call successors, (1030) [2021-11-23 03:10:41,901 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11379 states to 11379 states and 16822 transitions. [2021-11-23 03:10:41,903 INFO L78 Accepts]: Start accepts. Automaton has 11379 states and 16822 transitions. Word has length 135 [2021-11-23 03:10:41,904 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:10:41,904 INFO L470 AbstractCegarLoop]: Abstraction has 11379 states and 16822 transitions. [2021-11-23 03:10:41,904 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 30.333333333333332) internal successors, (91), 3 states have internal predecessors, (91), 3 states have call successors, (11), 3 states have call predecessors, (11), 2 states have return successors, (10), 2 states have call predecessors, (10), 3 states have call successors, (10) [2021-11-23 03:10:41,904 INFO L276 IsEmpty]: Start isEmpty. Operand 11379 states and 16822 transitions. [2021-11-23 03:10:41,963 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 136 [2021-11-23 03:10:41,964 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:10:41,964 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:10:42,003 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_094b7207-5913-40c5-a95b-0c93f54561b9/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2021-11-23 03:10:42,177 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23,11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_094b7207-5913-40c5-a95b-0c93f54561b9/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:10:42,177 INFO L402 AbstractCegarLoop]: === Iteration 25 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:10:42,177 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:10:42,178 INFO L85 PathProgramCache]: Analyzing trace with hash -1973620384, now seen corresponding path program 1 times [2021-11-23 03:10:42,178 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:10:42,178 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [834197400] [2021-11-23 03:10:42,178 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:10:42,178 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:10:42,201 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:10:42,267 INFO L134 CoverageAnalysis]: Checked inductivity of 88 backedges. 10 proven. 36 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2021-11-23 03:10:42,268 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:10:42,268 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [834197400] [2021-11-23 03:10:42,268 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [834197400] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:10:42,268 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1288160440] [2021-11-23 03:10:42,268 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:10:42,268 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:10:42,269 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_094b7207-5913-40c5-a95b-0c93f54561b9/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:10:42,273 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_094b7207-5913-40c5-a95b-0c93f54561b9/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:10:42,293 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_094b7207-5913-40c5-a95b-0c93f54561b9/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2021-11-23 03:10:42,448 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:10:42,452 INFO L263 TraceCheckSpWp]: Trace formula consists of 750 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 03:10:42,456 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:10:42,716 INFO L134 CoverageAnalysis]: Checked inductivity of 88 backedges. 62 proven. 0 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2021-11-23 03:10:42,717 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 03:10:42,717 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1288160440] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:10:42,717 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 03:10:42,718 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 7 [2021-11-23 03:10:42,718 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1333130225] [2021-11-23 03:10:42,718 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:10:42,719 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 03:10:42,719 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:10:42,719 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 03:10:42,720 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-11-23 03:10:42,720 INFO L87 Difference]: Start difference. First operand 11379 states and 16822 transitions. Second operand has 3 states, 3 states have (on average 30.333333333333332) internal successors, (91), 3 states have internal predecessors, (91), 3 states have call successors, (11), 3 states have call predecessors, (11), 2 states have return successors, (10), 2 states have call predecessors, (10), 3 states have call successors, (10) [2021-11-23 03:10:43,340 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:10:43,341 INFO L93 Difference]: Finished difference Result 18761 states and 27403 transitions. [2021-11-23 03:10:43,341 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 03:10:43,341 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 30.333333333333332) internal successors, (91), 3 states have internal predecessors, (91), 3 states have call successors, (11), 3 states have call predecessors, (11), 2 states have return successors, (10), 2 states have call predecessors, (10), 3 states have call successors, (10) Word has length 135 [2021-11-23 03:10:43,342 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:10:43,394 INFO L225 Difference]: With dead ends: 18761 [2021-11-23 03:10:43,394 INFO L226 Difference]: Without dead ends: 13037 [2021-11-23 03:10:43,415 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 142 GetRequests, 137 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-11-23 03:10:43,415 INFO L933 BasicCegarLoop]: 155 mSDtfsCounter, 139 mSDsluCounter, 40 mSDsCounter, 0 mSdLazyCounter, 38 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 139 SdHoareTripleChecker+Valid, 189 SdHoareTripleChecker+Invalid, 42 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 38 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-23 03:10:43,416 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [139 Valid, 189 Invalid, 42 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 38 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-23 03:10:43,432 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13037 states. [2021-11-23 03:10:44,344 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13037 to 13037. [2021-11-23 03:10:44,361 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 13037 states, 11206 states have (on average 1.4740317686953417) internal successors, (16518), 11241 states have internal predecessors, (16518), 1094 states have call successors, (1094), 737 states have call predecessors, (1094), 736 states have return successors, (1092), 1059 states have call predecessors, (1092), 1092 states have call successors, (1092) [2021-11-23 03:10:44,414 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13037 states to 13037 states and 18704 transitions. [2021-11-23 03:10:44,416 INFO L78 Accepts]: Start accepts. Automaton has 13037 states and 18704 transitions. Word has length 135 [2021-11-23 03:10:44,416 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:10:44,417 INFO L470 AbstractCegarLoop]: Abstraction has 13037 states and 18704 transitions. [2021-11-23 03:10:44,417 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 30.333333333333332) internal successors, (91), 3 states have internal predecessors, (91), 3 states have call successors, (11), 3 states have call predecessors, (11), 2 states have return successors, (10), 2 states have call predecessors, (10), 3 states have call successors, (10) [2021-11-23 03:10:44,417 INFO L276 IsEmpty]: Start isEmpty. Operand 13037 states and 18704 transitions. [2021-11-23 03:10:44,453 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 136 [2021-11-23 03:10:44,453 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:10:44,453 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:10:44,490 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_094b7207-5913-40c5-a95b-0c93f54561b9/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2021-11-23 03:10:44,669 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_094b7207-5913-40c5-a95b-0c93f54561b9/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable24 [2021-11-23 03:10:44,669 INFO L402 AbstractCegarLoop]: === Iteration 26 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:10:44,670 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:10:44,670 INFO L85 PathProgramCache]: Analyzing trace with hash 648134150, now seen corresponding path program 1 times [2021-11-23 03:10:44,670 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:10:44,670 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1126696204] [2021-11-23 03:10:44,670 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:10:44,670 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:10:44,692 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:10:44,760 INFO L134 CoverageAnalysis]: Checked inductivity of 88 backedges. 10 proven. 35 refuted. 0 times theorem prover too weak. 43 trivial. 0 not checked. [2021-11-23 03:10:44,762 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:10:44,762 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1126696204] [2021-11-23 03:10:44,762 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1126696204] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:10:44,762 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1317274145] [2021-11-23 03:10:44,763 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:10:44,763 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:10:44,763 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_094b7207-5913-40c5-a95b-0c93f54561b9/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:10:44,764 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_094b7207-5913-40c5-a95b-0c93f54561b9/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:10:44,789 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_094b7207-5913-40c5-a95b-0c93f54561b9/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2021-11-23 03:10:44,967 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:10:44,971 INFO L263 TraceCheckSpWp]: Trace formula consists of 753 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-23 03:10:44,976 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:10:45,184 INFO L134 CoverageAnalysis]: Checked inductivity of 88 backedges. 73 proven. 0 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-23 03:10:45,185 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 03:10:45,185 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1317274145] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:10:45,185 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 03:10:45,185 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [6] total 8 [2021-11-23 03:10:45,186 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1503800898] [2021-11-23 03:10:45,186 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:10:45,187 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 03:10:45,187 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:10:45,187 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 03:10:45,187 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2021-11-23 03:10:45,188 INFO L87 Difference]: Start difference. First operand 13037 states and 18704 transitions. Second operand has 4 states, 4 states have (on average 25.25) internal successors, (101), 4 states have internal predecessors, (101), 2 states have call successors, (11), 2 states have call predecessors, (11), 3 states have return successors, (10), 3 states have call predecessors, (10), 2 states have call successors, (10) [2021-11-23 03:10:46,854 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:10:46,854 INFO L93 Difference]: Finished difference Result 38951 states and 55700 transitions. [2021-11-23 03:10:46,854 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-23 03:10:46,855 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 25.25) internal successors, (101), 4 states have internal predecessors, (101), 2 states have call successors, (11), 2 states have call predecessors, (11), 3 states have return successors, (10), 3 states have call predecessors, (10), 2 states have call successors, (10) Word has length 135 [2021-11-23 03:10:46,855 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:10:46,970 INFO L225 Difference]: With dead ends: 38951 [2021-11-23 03:10:46,971 INFO L226 Difference]: Without dead ends: 25921 [2021-11-23 03:10:47,003 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 144 GetRequests, 137 SyntacticMatches, 0 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=18, Invalid=54, Unknown=0, NotChecked=0, Total=72 [2021-11-23 03:10:47,004 INFO L933 BasicCegarLoop]: 268 mSDtfsCounter, 157 mSDsluCounter, 449 mSDsCounter, 0 mSdLazyCounter, 138 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 157 SdHoareTripleChecker+Valid, 650 SdHoareTripleChecker+Invalid, 144 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 138 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 03:10:47,007 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [157 Valid, 650 Invalid, 144 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 138 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 03:10:47,037 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25921 states. [2021-11-23 03:10:48,304 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25921 to 25781. [2021-11-23 03:10:48,337 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25781 states, 22100 states have (on average 1.4438009049773757) internal successors, (31908), 22232 states have internal predecessors, (31908), 2147 states have call successors, (2147), 1470 states have call predecessors, (2147), 1533 states have return successors, (2525), 2079 states have call predecessors, (2525), 2145 states have call successors, (2525) [2021-11-23 03:10:48,443 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25781 states to 25781 states and 36580 transitions. [2021-11-23 03:10:48,446 INFO L78 Accepts]: Start accepts. Automaton has 25781 states and 36580 transitions. Word has length 135 [2021-11-23 03:10:48,447 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:10:48,447 INFO L470 AbstractCegarLoop]: Abstraction has 25781 states and 36580 transitions. [2021-11-23 03:10:48,447 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 25.25) internal successors, (101), 4 states have internal predecessors, (101), 2 states have call successors, (11), 2 states have call predecessors, (11), 3 states have return successors, (10), 3 states have call predecessors, (10), 2 states have call successors, (10) [2021-11-23 03:10:48,447 INFO L276 IsEmpty]: Start isEmpty. Operand 25781 states and 36580 transitions. [2021-11-23 03:10:48,696 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 136 [2021-11-23 03:10:48,696 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:10:48,697 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:10:48,738 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_094b7207-5913-40c5-a95b-0c93f54561b9/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2021-11-23 03:10:48,911 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable25,13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_094b7207-5913-40c5-a95b-0c93f54561b9/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:10:48,911 INFO L402 AbstractCegarLoop]: === Iteration 27 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:10:48,912 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:10:48,912 INFO L85 PathProgramCache]: Analyzing trace with hash 1353052837, now seen corresponding path program 2 times [2021-11-23 03:10:48,912 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:10:48,912 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [940337741] [2021-11-23 03:10:48,912 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:10:48,912 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:10:48,933 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:10:49,012 INFO L134 CoverageAnalysis]: Checked inductivity of 88 backedges. 10 proven. 36 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2021-11-23 03:10:49,012 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:10:49,013 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [940337741] [2021-11-23 03:10:49,013 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [940337741] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:10:49,013 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [520592451] [2021-11-23 03:10:49,013 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 03:10:49,014 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:10:49,014 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_094b7207-5913-40c5-a95b-0c93f54561b9/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:10:49,015 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_094b7207-5913-40c5-a95b-0c93f54561b9/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:10:49,033 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_094b7207-5913-40c5-a95b-0c93f54561b9/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2021-11-23 03:10:49,159 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-11-23 03:10:49,159 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 03:10:49,162 INFO L263 TraceCheckSpWp]: Trace formula consists of 491 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-23 03:10:49,166 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:10:49,435 INFO L134 CoverageAnalysis]: Checked inductivity of 88 backedges. 73 proven. 0 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-23 03:10:49,436 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 03:10:49,436 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [520592451] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:10:49,436 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 03:10:49,436 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 7 [2021-11-23 03:10:49,437 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1709257459] [2021-11-23 03:10:49,437 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:10:49,438 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 03:10:49,438 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:10:49,438 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 03:10:49,439 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-11-23 03:10:49,439 INFO L87 Difference]: Start difference. First operand 25781 states and 36580 transitions. Second operand has 3 states, 3 states have (on average 33.666666666666664) internal successors, (101), 3 states have internal predecessors, (101), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) [2021-11-23 03:10:51,411 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:10:51,412 INFO L93 Difference]: Finished difference Result 51615 states and 74748 transitions. [2021-11-23 03:10:51,412 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 03:10:51,412 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 33.666666666666664) internal successors, (101), 3 states have internal predecessors, (101), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) Word has length 135 [2021-11-23 03:10:51,413 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:10:51,565 INFO L225 Difference]: With dead ends: 51615 [2021-11-23 03:10:51,565 INFO L226 Difference]: Without dead ends: 38161 [2021-11-23 03:10:51,605 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 142 GetRequests, 137 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-11-23 03:10:51,606 INFO L933 BasicCegarLoop]: 171 mSDtfsCounter, 132 mSDsluCounter, 149 mSDsCounter, 0 mSdLazyCounter, 60 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 132 SdHoareTripleChecker+Valid, 297 SdHoareTripleChecker+Invalid, 64 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 60 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 03:10:51,606 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [132 Valid, 297 Invalid, 64 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 60 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 03:10:51,651 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38161 states. [2021-11-23 03:10:54,101 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38161 to 37801. [2021-11-23 03:10:54,127 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 37801 states, 32336 states have (on average 1.4413656605640772) internal successors, (46608), 32500 states have internal predecessors, (46608), 3199 states have call successors, (3199), 2202 states have call predecessors, (3199), 2265 states have return successors, (4053), 3099 states have call predecessors, (4053), 3197 states have call successors, (4053) [2021-11-23 03:10:54,268 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37801 states to 37801 states and 53860 transitions. [2021-11-23 03:10:54,272 INFO L78 Accepts]: Start accepts. Automaton has 37801 states and 53860 transitions. Word has length 135 [2021-11-23 03:10:54,273 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:10:54,273 INFO L470 AbstractCegarLoop]: Abstraction has 37801 states and 53860 transitions. [2021-11-23 03:10:54,274 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 33.666666666666664) internal successors, (101), 3 states have internal predecessors, (101), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) [2021-11-23 03:10:54,274 INFO L276 IsEmpty]: Start isEmpty. Operand 37801 states and 53860 transitions. [2021-11-23 03:10:54,385 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 136 [2021-11-23 03:10:54,386 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:10:54,386 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:10:54,433 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_094b7207-5913-40c5-a95b-0c93f54561b9/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2021-11-23 03:10:54,613 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_094b7207-5913-40c5-a95b-0c93f54561b9/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable26 [2021-11-23 03:10:54,613 INFO L402 AbstractCegarLoop]: === Iteration 28 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:10:54,613 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:10:54,614 INFO L85 PathProgramCache]: Analyzing trace with hash 1931905611, now seen corresponding path program 3 times [2021-11-23 03:10:54,614 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:10:54,614 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [7841673] [2021-11-23 03:10:54,614 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:10:54,614 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:10:54,631 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:10:54,691 INFO L134 CoverageAnalysis]: Checked inductivity of 88 backedges. 10 proven. 36 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2021-11-23 03:10:54,692 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:10:54,692 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [7841673] [2021-11-23 03:10:54,692 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [7841673] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:10:54,692 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2083923219] [2021-11-23 03:10:54,692 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2021-11-23 03:10:54,693 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:10:54,693 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_094b7207-5913-40c5-a95b-0c93f54561b9/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:10:54,694 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_094b7207-5913-40c5-a95b-0c93f54561b9/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:10:54,724 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_094b7207-5913-40c5-a95b-0c93f54561b9/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2021-11-23 03:10:54,843 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2021-11-23 03:10:54,843 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 03:10:54,846 INFO L263 TraceCheckSpWp]: Trace formula consists of 445 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-23 03:10:54,850 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:10:55,084 INFO L134 CoverageAnalysis]: Checked inductivity of 88 backedges. 66 proven. 0 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2021-11-23 03:10:55,085 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 03:10:55,085 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2083923219] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:10:55,085 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 03:10:55,086 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 7 [2021-11-23 03:10:55,086 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [470094894] [2021-11-23 03:10:55,086 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:10:55,087 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 03:10:55,087 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:10:55,087 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 03:10:55,087 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-11-23 03:10:55,088 INFO L87 Difference]: Start difference. First operand 37801 states and 53860 transitions. Second operand has 3 states, 3 states have (on average 32.666666666666664) internal successors, (98), 3 states have internal predecessors, (98), 3 states have call successors, (10), 3 states have call predecessors, (10), 3 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) [2021-11-23 03:10:57,734 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:10:57,735 INFO L93 Difference]: Finished difference Result 66997 states and 94945 transitions. [2021-11-23 03:10:57,735 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 03:10:57,735 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 32.666666666666664) internal successors, (98), 3 states have internal predecessors, (98), 3 states have call successors, (10), 3 states have call predecessors, (10), 3 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) Word has length 135 [2021-11-23 03:10:57,736 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:10:57,906 INFO L225 Difference]: With dead ends: 66997 [2021-11-23 03:10:57,907 INFO L226 Difference]: Without dead ends: 41235 [2021-11-23 03:10:57,971 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 142 GetRequests, 137 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-11-23 03:10:57,972 INFO L933 BasicCegarLoop]: 161 mSDtfsCounter, 98 mSDsluCounter, 47 mSDsCounter, 0 mSdLazyCounter, 45 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 98 SdHoareTripleChecker+Valid, 202 SdHoareTripleChecker+Invalid, 49 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 45 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 03:10:57,973 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [98 Valid, 202 Invalid, 49 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 45 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 03:10:58,025 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41235 states. [2021-11-23 03:11:00,478 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41235 to 41155. [2021-11-23 03:11:00,503 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 41155 states, 35434 states have (on average 1.413614043009539) internal successors, (50090), 35502 states have internal predecessors, (50090), 3285 states have call successors, (3285), 2480 states have call predecessors, (3285), 2435 states have return successors, (3917), 3173 states have call predecessors, (3917), 3283 states have call successors, (3917) [2021-11-23 03:11:00,659 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41155 states to 41155 states and 57292 transitions. [2021-11-23 03:11:00,666 INFO L78 Accepts]: Start accepts. Automaton has 41155 states and 57292 transitions. Word has length 135 [2021-11-23 03:11:00,667 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:11:00,667 INFO L470 AbstractCegarLoop]: Abstraction has 41155 states and 57292 transitions. [2021-11-23 03:11:00,667 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 32.666666666666664) internal successors, (98), 3 states have internal predecessors, (98), 3 states have call successors, (10), 3 states have call predecessors, (10), 3 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10) [2021-11-23 03:11:00,668 INFO L276 IsEmpty]: Start isEmpty. Operand 41155 states and 57292 transitions. [2021-11-23 03:11:00,762 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 136 [2021-11-23 03:11:00,763 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:11:00,763 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:11:00,809 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_094b7207-5913-40c5-a95b-0c93f54561b9/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2021-11-23 03:11:00,977 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_094b7207-5913-40c5-a95b-0c93f54561b9/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable27 [2021-11-23 03:11:00,978 INFO L402 AbstractCegarLoop]: === Iteration 29 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:11:00,978 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:11:00,978 INFO L85 PathProgramCache]: Analyzing trace with hash 1874761386, now seen corresponding path program 1 times [2021-11-23 03:11:00,978 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:11:00,978 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1931129561] [2021-11-23 03:11:00,979 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:11:00,979 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:11:00,996 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:11:01,069 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 10 proven. 37 refuted. 0 times theorem prover too weak. 43 trivial. 0 not checked. [2021-11-23 03:11:01,069 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:11:01,069 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1931129561] [2021-11-23 03:11:01,070 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1931129561] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:11:01,070 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [995511394] [2021-11-23 03:11:01,070 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:11:01,070 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:11:01,070 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_094b7207-5913-40c5-a95b-0c93f54561b9/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:11:01,071 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_094b7207-5913-40c5-a95b-0c93f54561b9/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:11:01,093 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_094b7207-5913-40c5-a95b-0c93f54561b9/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2021-11-23 03:11:01,251 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:11:01,255 INFO L263 TraceCheckSpWp]: Trace formula consists of 747 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-23 03:11:01,259 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:11:01,443 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 62 proven. 0 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-11-23 03:11:01,443 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 03:11:01,443 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [995511394] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:11:01,443 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 03:11:01,443 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 7 [2021-11-23 03:11:01,444 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [419692714] [2021-11-23 03:11:01,444 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:11:01,444 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 03:11:01,444 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:11:01,445 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 03:11:01,445 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-11-23 03:11:01,445 INFO L87 Difference]: Start difference. First operand 41155 states and 57292 transitions. Second operand has 3 states, 3 states have (on average 30.0) internal successors, (90), 3 states have internal predecessors, (90), 3 states have call successors, (11), 3 states have call predecessors, (11), 2 states have return successors, (10), 2 states have call predecessors, (10), 3 states have call successors, (10) [2021-11-23 03:11:03,220 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:11:03,220 INFO L93 Difference]: Finished difference Result 55235 states and 77620 transitions. [2021-11-23 03:11:03,221 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 03:11:03,221 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 30.0) internal successors, (90), 3 states have internal predecessors, (90), 3 states have call successors, (11), 3 states have call predecessors, (11), 2 states have return successors, (10), 2 states have call predecessors, (10), 3 states have call successors, (10) Word has length 135 [2021-11-23 03:11:03,221 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:11:03,329 INFO L225 Difference]: With dead ends: 55235 [2021-11-23 03:11:03,330 INFO L226 Difference]: Without dead ends: 27643 [2021-11-23 03:11:03,395 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 142 GetRequests, 137 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-11-23 03:11:03,396 INFO L933 BasicCegarLoop]: 259 mSDtfsCounter, 137 mSDsluCounter, 154 mSDsCounter, 0 mSdLazyCounter, 84 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 137 SdHoareTripleChecker+Valid, 388 SdHoareTripleChecker+Invalid, 86 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 84 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 03:11:03,397 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [137 Valid, 388 Invalid, 86 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 84 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 03:11:03,431 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27643 states. [2021-11-23 03:11:05,056 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27643 to 27383. [2021-11-23 03:11:05,071 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27383 states, 23568 states have (on average 1.402579769178547) internal successors, (33056), 23604 states have internal predecessors, (33056), 2205 states have call successors, (2205), 1656 states have call predecessors, (2205), 1609 states have return successors, (2331), 2123 states have call predecessors, (2331), 2203 states have call successors, (2331) [2021-11-23 03:11:05,154 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27383 states to 27383 states and 37592 transitions. [2021-11-23 03:11:05,158 INFO L78 Accepts]: Start accepts. Automaton has 27383 states and 37592 transitions. Word has length 135 [2021-11-23 03:11:05,159 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:11:05,159 INFO L470 AbstractCegarLoop]: Abstraction has 27383 states and 37592 transitions. [2021-11-23 03:11:05,159 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 30.0) internal successors, (90), 3 states have internal predecessors, (90), 3 states have call successors, (11), 3 states have call predecessors, (11), 2 states have return successors, (10), 2 states have call predecessors, (10), 3 states have call successors, (10) [2021-11-23 03:11:05,159 INFO L276 IsEmpty]: Start isEmpty. Operand 27383 states and 37592 transitions. [2021-11-23 03:11:05,223 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 133 [2021-11-23 03:11:05,224 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:11:05,224 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:11:05,260 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_094b7207-5913-40c5-a95b-0c93f54561b9/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Ended with exit code 0 [2021-11-23 03:11:05,437 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_094b7207-5913-40c5-a95b-0c93f54561b9/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable28 [2021-11-23 03:11:05,437 INFO L402 AbstractCegarLoop]: === Iteration 30 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:11:05,437 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:11:05,438 INFO L85 PathProgramCache]: Analyzing trace with hash 39970402, now seen corresponding path program 1 times [2021-11-23 03:11:05,438 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:11:05,438 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1801296040] [2021-11-23 03:11:05,438 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:11:05,438 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:11:05,464 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:11:05,510 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 22 proven. 3 refuted. 0 times theorem prover too weak. 67 trivial. 0 not checked. [2021-11-23 03:11:05,510 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:11:05,511 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1801296040] [2021-11-23 03:11:05,511 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1801296040] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:11:05,511 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [820012795] [2021-11-23 03:11:05,511 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:11:05,511 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:11:05,512 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_094b7207-5913-40c5-a95b-0c93f54561b9/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:11:05,517 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_094b7207-5913-40c5-a95b-0c93f54561b9/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:11:05,541 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_094b7207-5913-40c5-a95b-0c93f54561b9/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2021-11-23 03:11:05,703 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:11:05,706 INFO L263 TraceCheckSpWp]: Trace formula consists of 727 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 03:11:05,711 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:11:05,922 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 72 proven. 0 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2021-11-23 03:11:05,922 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 03:11:05,923 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [820012795] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:11:05,923 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 03:11:05,924 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [5] total 6 [2021-11-23 03:11:05,926 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1188109520] [2021-11-23 03:11:05,927 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:11:05,927 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 03:11:05,927 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:11:05,928 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 03:11:05,929 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-11-23 03:11:05,929 INFO L87 Difference]: Start difference. First operand 27383 states and 37592 transitions. Second operand has 3 states, 3 states have (on average 30.0) internal successors, (90), 3 states have internal predecessors, (90), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2021-11-23 03:11:07,781 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:11:07,781 INFO L93 Difference]: Finished difference Result 51491 states and 71656 transitions. [2021-11-23 03:11:07,781 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 03:11:07,781 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 30.0) internal successors, (90), 3 states have internal predecessors, (90), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) Word has length 132 [2021-11-23 03:11:07,782 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:11:07,879 INFO L225 Difference]: With dead ends: 51491 [2021-11-23 03:11:07,880 INFO L226 Difference]: Without dead ends: 37351 [2021-11-23 03:11:07,916 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 136 GetRequests, 132 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-11-23 03:11:07,917 INFO L933 BasicCegarLoop]: 216 mSDtfsCounter, 90 mSDsluCounter, 166 mSDsCounter, 0 mSdLazyCounter, 75 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 90 SdHoareTripleChecker+Valid, 359 SdHoareTripleChecker+Invalid, 75 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 75 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 03:11:07,917 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [90 Valid, 359 Invalid, 75 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 75 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 03:11:07,964 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37351 states. [2021-11-23 03:11:10,371 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37351 to 33359. [2021-11-23 03:11:10,392 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 33359 states, 28968 states have (on average 1.4310963822148577) internal successors, (41456), 29004 states have internal predecessors, (41456), 2493 states have call successors, (2493), 1944 states have call predecessors, (2493), 1897 states have return successors, (2619), 2411 states have call predecessors, (2619), 2491 states have call successors, (2619) [2021-11-23 03:11:10,473 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33359 states to 33359 states and 46568 transitions. [2021-11-23 03:11:10,476 INFO L78 Accepts]: Start accepts. Automaton has 33359 states and 46568 transitions. Word has length 132 [2021-11-23 03:11:10,477 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:11:10,477 INFO L470 AbstractCegarLoop]: Abstraction has 33359 states and 46568 transitions. [2021-11-23 03:11:10,477 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 30.0) internal successors, (90), 3 states have internal predecessors, (90), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2021-11-23 03:11:10,478 INFO L276 IsEmpty]: Start isEmpty. Operand 33359 states and 46568 transitions. [2021-11-23 03:11:10,522 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 133 [2021-11-23 03:11:10,523 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:11:10,523 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:11:10,549 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_094b7207-5913-40c5-a95b-0c93f54561b9/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Forceful destruction successful, exit code 0 [2021-11-23 03:11:10,723 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29,17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_094b7207-5913-40c5-a95b-0c93f54561b9/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:11:10,724 INFO L402 AbstractCegarLoop]: === Iteration 31 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:11:10,725 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:11:10,725 INFO L85 PathProgramCache]: Analyzing trace with hash -851715011, now seen corresponding path program 1 times [2021-11-23 03:11:10,725 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:11:10,725 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [126438424] [2021-11-23 03:11:10,726 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:11:10,726 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:11:10,747 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:11:10,789 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 21 proven. 4 refuted. 0 times theorem prover too weak. 65 trivial. 0 not checked. [2021-11-23 03:11:10,789 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:11:10,789 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [126438424] [2021-11-23 03:11:10,789 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [126438424] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:11:10,789 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [585289650] [2021-11-23 03:11:10,790 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:11:10,790 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:11:10,790 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_094b7207-5913-40c5-a95b-0c93f54561b9/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:11:10,791 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_094b7207-5913-40c5-a95b-0c93f54561b9/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:11:10,805 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_094b7207-5913-40c5-a95b-0c93f54561b9/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2021-11-23 03:11:10,963 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:11:10,966 INFO L263 TraceCheckSpWp]: Trace formula consists of 730 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 03:11:10,977 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:11:11,167 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 70 proven. 0 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2021-11-23 03:11:11,168 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 03:11:11,168 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [585289650] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:11:11,168 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 03:11:11,168 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [5] total 6 [2021-11-23 03:11:11,168 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1482094557] [2021-11-23 03:11:11,168 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:11:11,168 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 03:11:11,168 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:11:11,169 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 03:11:11,169 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-11-23 03:11:11,169 INFO L87 Difference]: Start difference. First operand 33359 states and 46568 transitions. Second operand has 3 states, 3 states have (on average 30.0) internal successors, (90), 3 states have internal predecessors, (90), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2021-11-23 03:11:13,280 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:11:13,280 INFO L93 Difference]: Finished difference Result 63315 states and 89080 transitions. [2021-11-23 03:11:13,281 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 03:11:13,281 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 30.0) internal successors, (90), 3 states have internal predecessors, (90), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) Word has length 132 [2021-11-23 03:11:13,281 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:11:13,400 INFO L225 Difference]: With dead ends: 63315 [2021-11-23 03:11:13,400 INFO L226 Difference]: Without dead ends: 46259 [2021-11-23 03:11:13,428 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 136 GetRequests, 132 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-11-23 03:11:13,429 INFO L933 BasicCegarLoop]: 233 mSDtfsCounter, 96 mSDsluCounter, 166 mSDsCounter, 0 mSdLazyCounter, 77 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 96 SdHoareTripleChecker+Valid, 376 SdHoareTripleChecker+Invalid, 77 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 77 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 03:11:13,430 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [96 Valid, 376 Invalid, 77 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 77 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 03:11:13,482 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46259 states. [2021-11-23 03:11:15,871 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46259 to 41675. [2021-11-23 03:11:15,899 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 41675 states, 36420 states have (on average 1.4486545853926414) internal successors, (52760), 36456 states have internal predecessors, (52760), 2925 states have call successors, (2925), 2376 states have call predecessors, (2925), 2329 states have return successors, (3051), 2843 states have call predecessors, (3051), 2923 states have call successors, (3051) [2021-11-23 03:11:16,001 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41675 states to 41675 states and 58736 transitions. [2021-11-23 03:11:16,006 INFO L78 Accepts]: Start accepts. Automaton has 41675 states and 58736 transitions. Word has length 132 [2021-11-23 03:11:16,006 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:11:16,006 INFO L470 AbstractCegarLoop]: Abstraction has 41675 states and 58736 transitions. [2021-11-23 03:11:16,006 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 30.0) internal successors, (90), 3 states have internal predecessors, (90), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2021-11-23 03:11:16,007 INFO L276 IsEmpty]: Start isEmpty. Operand 41675 states and 58736 transitions. [2021-11-23 03:11:16,062 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 133 [2021-11-23 03:11:16,062 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:11:16,062 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:11:16,089 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_094b7207-5913-40c5-a95b-0c93f54561b9/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Forceful destruction successful, exit code 0 [2021-11-23 03:11:16,263 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30,18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_094b7207-5913-40c5-a95b-0c93f54561b9/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:11:16,263 INFO L402 AbstractCegarLoop]: === Iteration 32 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:11:16,264 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:11:16,264 INFO L85 PathProgramCache]: Analyzing trace with hash 1368195944, now seen corresponding path program 2 times [2021-11-23 03:11:16,264 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:11:16,264 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [626666158] [2021-11-23 03:11:16,264 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:11:16,264 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:11:16,279 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:11:16,338 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 10 proven. 39 refuted. 0 times theorem prover too weak. 43 trivial. 0 not checked. [2021-11-23 03:11:16,339 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:11:16,339 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [626666158] [2021-11-23 03:11:16,339 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [626666158] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:11:16,339 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [633214976] [2021-11-23 03:11:16,340 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-23 03:11:16,340 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:11:16,340 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_094b7207-5913-40c5-a95b-0c93f54561b9/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:11:16,345 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_094b7207-5913-40c5-a95b-0c93f54561b9/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:11:16,350 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_094b7207-5913-40c5-a95b-0c93f54561b9/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2021-11-23 03:11:16,495 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2021-11-23 03:11:16,495 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-23 03:11:16,498 INFO L263 TraceCheckSpWp]: Trace formula consists of 482 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-23 03:11:16,502 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:11:16,686 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 60 proven. 0 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-11-23 03:11:16,687 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 03:11:16,687 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [633214976] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:11:16,687 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 03:11:16,687 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 7 [2021-11-23 03:11:16,687 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1171793059] [2021-11-23 03:11:16,687 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:11:16,687 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 03:11:16,688 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:11:16,688 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 03:11:16,688 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-11-23 03:11:16,688 INFO L87 Difference]: Start difference. First operand 41675 states and 58736 transitions. Second operand has 3 states, 3 states have (on average 27.333333333333332) internal successors, (82), 3 states have internal predecessors, (82), 3 states have call successors, (11), 3 states have call predecessors, (11), 2 states have return successors, (10), 2 states have call predecessors, (10), 3 states have call successors, (10) [2021-11-23 03:11:19,198 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 03:11:19,198 INFO L93 Difference]: Finished difference Result 67403 states and 96222 transitions. [2021-11-23 03:11:19,199 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 03:11:19,199 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 27.333333333333332) internal successors, (82), 3 states have internal predecessors, (82), 3 states have call successors, (11), 3 states have call predecessors, (11), 2 states have return successors, (10), 2 states have call predecessors, (10), 3 states have call successors, (10) Word has length 132 [2021-11-23 03:11:19,199 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 03:11:19,286 INFO L225 Difference]: With dead ends: 67403 [2021-11-23 03:11:19,286 INFO L226 Difference]: Without dead ends: 41743 [2021-11-23 03:11:19,316 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 139 GetRequests, 134 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-11-23 03:11:19,317 INFO L933 BasicCegarLoop]: 239 mSDtfsCounter, 139 mSDsluCounter, 154 mSDsCounter, 0 mSdLazyCounter, 78 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 139 SdHoareTripleChecker+Valid, 368 SdHoareTripleChecker+Invalid, 81 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 78 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-23 03:11:19,317 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [139 Valid, 368 Invalid, 81 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 78 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-23 03:11:19,350 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41743 states. [2021-11-23 03:11:21,250 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41743 to 40939. [2021-11-23 03:11:21,278 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40939 states, 35684 states have (on average 1.4287635915256138) internal successors, (50984), 35720 states have internal predecessors, (50984), 2925 states have call successors, (2925), 2376 states have call predecessors, (2925), 2329 states have return successors, (3051), 2843 states have call predecessors, (3051), 2923 states have call successors, (3051) [2021-11-23 03:11:21,378 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40939 states to 40939 states and 56960 transitions. [2021-11-23 03:11:21,382 INFO L78 Accepts]: Start accepts. Automaton has 40939 states and 56960 transitions. Word has length 132 [2021-11-23 03:11:21,382 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 03:11:21,383 INFO L470 AbstractCegarLoop]: Abstraction has 40939 states and 56960 transitions. [2021-11-23 03:11:21,383 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 27.333333333333332) internal successors, (82), 3 states have internal predecessors, (82), 3 states have call successors, (11), 3 states have call predecessors, (11), 2 states have return successors, (10), 2 states have call predecessors, (10), 3 states have call successors, (10) [2021-11-23 03:11:21,383 INFO L276 IsEmpty]: Start isEmpty. Operand 40939 states and 56960 transitions. [2021-11-23 03:11:21,438 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 133 [2021-11-23 03:11:21,439 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 03:11:21,439 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 03:11:21,470 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_094b7207-5913-40c5-a95b-0c93f54561b9/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Ended with exit code 0 [2021-11-23 03:11:21,653 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_094b7207-5913-40c5-a95b-0c93f54561b9/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable31 [2021-11-23 03:11:21,653 INFO L402 AbstractCegarLoop]: === Iteration 33 === Targeting error2Err0ASSERT_VIOLATIONERROR_FUNCTION === [error1Err0ASSERT_VIOLATIONERROR_FUNCTION, error2Err0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 03:11:21,653 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 03:11:21,654 INFO L85 PathProgramCache]: Analyzing trace with hash 1311338470, now seen corresponding path program 1 times [2021-11-23 03:11:21,654 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 03:11:21,654 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1497267700] [2021-11-23 03:11:21,654 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:11:21,654 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 03:11:21,670 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:11:21,729 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 10 proven. 37 refuted. 0 times theorem prover too weak. 43 trivial. 0 not checked. [2021-11-23 03:11:21,729 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 03:11:21,729 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1497267700] [2021-11-23 03:11:21,729 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1497267700] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 03:11:21,730 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1930951533] [2021-11-23 03:11:21,730 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 03:11:21,730 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 03:11:21,730 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_094b7207-5913-40c5-a95b-0c93f54561b9/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 03:11:21,731 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_094b7207-5913-40c5-a95b-0c93f54561b9/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 03:11:21,751 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_094b7207-5913-40c5-a95b-0c93f54561b9/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2021-11-23 03:11:21,920 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 03:11:21,924 INFO L263 TraceCheckSpWp]: Trace formula consists of 733 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-23 03:11:21,927 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 03:11:22,127 INFO L134 CoverageAnalysis]: Checked inductivity of 90 backedges. 66 proven. 0 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2021-11-23 03:11:22,127 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 03:11:22,128 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1930951533] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 03:11:22,128 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 03:11:22,128 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6] total 7 [2021-11-23 03:11:22,128 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [210261476] [2021-11-23 03:11:22,128 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 03:11:22,128 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 03:11:22,128 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 03:11:22,129 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 03:11:22,129 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-11-23 03:11:22,129 INFO L87 Difference]: Start difference. First operand 40939 states and 56960 transitions. Second operand has 3 states, 3 states have (on average 30.0) internal successors, (90), 3 states have internal predecessors, (90), 3 states have call successors, (11), 3 states have call predecessors, (11), 3 states have return successors, (10), 3 states have call predecessors, (10), 3 states have call successors, (10)