./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/seq-mthreaded/pals_STARTPALS_ActiveStandby.4_1.ufo.BOUNDED-10.pals.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 53f42b1a Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0537642d-0b8a-4af5-8a6c-b14990b15b9a/bin/utaipan-TEXQjIfE4P/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0537642d-0b8a-4af5-8a6c-b14990b15b9a/bin/utaipan-TEXQjIfE4P/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0537642d-0b8a-4af5-8a6c-b14990b15b9a/bin/utaipan-TEXQjIfE4P/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0537642d-0b8a-4af5-8a6c-b14990b15b9a/bin/utaipan-TEXQjIfE4P/config/TaipanReach.xml -i ../../sv-benchmarks/c/seq-mthreaded/pals_STARTPALS_ActiveStandby.4_1.ufo.BOUNDED-10.pals.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0537642d-0b8a-4af5-8a6c-b14990b15b9a/bin/utaipan-TEXQjIfE4P/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0537642d-0b8a-4af5-8a6c-b14990b15b9a/bin/utaipan-TEXQjIfE4P --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash a30aa210ed4a7c8ee647a70aef136aef282e5eccb07388ecda6495e33bc30b6d --- Real Ultimate output --- This is Ultimate 0.2.1-dev-53f42b1 [2021-11-21 01:03:05,233 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-21 01:03:05,236 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-21 01:03:05,302 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-21 01:03:05,302 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-21 01:03:05,308 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-21 01:03:05,309 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-21 01:03:05,312 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-21 01:03:05,314 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-21 01:03:05,315 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-21 01:03:05,316 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-21 01:03:05,318 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-21 01:03:05,318 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-21 01:03:05,320 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-21 01:03:05,321 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-21 01:03:05,323 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-21 01:03:05,324 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-21 01:03:05,325 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-21 01:03:05,327 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-21 01:03:05,330 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-21 01:03:05,332 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-21 01:03:05,334 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-21 01:03:05,336 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-21 01:03:05,337 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-21 01:03:05,341 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-21 01:03:05,342 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-21 01:03:05,342 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-21 01:03:05,343 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-21 01:03:05,344 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-21 01:03:05,345 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-21 01:03:05,346 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-21 01:03:05,347 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-21 01:03:05,348 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-21 01:03:05,349 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-21 01:03:05,350 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-21 01:03:05,350 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-21 01:03:05,351 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-21 01:03:05,352 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-21 01:03:05,352 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-21 01:03:05,354 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-21 01:03:05,354 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-21 01:03:05,355 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0537642d-0b8a-4af5-8a6c-b14990b15b9a/bin/utaipan-TEXQjIfE4P/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-21 01:03:05,381 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-21 01:03:05,385 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-21 01:03:05,385 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-21 01:03:05,386 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-21 01:03:05,387 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-21 01:03:05,390 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-21 01:03:05,390 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-21 01:03:05,391 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-21 01:03:05,391 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-21 01:03:05,391 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-21 01:03:05,392 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-21 01:03:05,393 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-21 01:03:05,393 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-21 01:03:05,393 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-21 01:03:05,393 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-21 01:03:05,394 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-21 01:03:05,394 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-21 01:03:05,394 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-21 01:03:05,395 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-21 01:03:05,395 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-21 01:03:05,396 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-21 01:03:05,396 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-21 01:03:05,396 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-21 01:03:05,396 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-21 01:03:05,396 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-21 01:03:05,397 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-21 01:03:05,398 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-21 01:03:05,399 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-21 01:03:05,399 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-21 01:03:05,399 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-21 01:03:05,399 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-21 01:03:05,400 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-21 01:03:05,400 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-21 01:03:05,400 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-21 01:03:05,401 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-21 01:03:05,401 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-21 01:03:05,401 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-21 01:03:05,401 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-21 01:03:05,402 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-21 01:03:05,402 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-21 01:03:05,402 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-21 01:03:05,402 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_0537642d-0b8a-4af5-8a6c-b14990b15b9a/bin/utaipan-TEXQjIfE4P/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0537642d-0b8a-4af5-8a6c-b14990b15b9a/bin/utaipan-TEXQjIfE4P Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> a30aa210ed4a7c8ee647a70aef136aef282e5eccb07388ecda6495e33bc30b6d [2021-11-21 01:03:05,645 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-21 01:03:05,665 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-21 01:03:05,668 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-21 01:03:05,669 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-21 01:03:05,670 INFO L275 PluginConnector]: CDTParser initialized [2021-11-21 01:03:05,671 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0537642d-0b8a-4af5-8a6c-b14990b15b9a/bin/utaipan-TEXQjIfE4P/../../sv-benchmarks/c/seq-mthreaded/pals_STARTPALS_ActiveStandby.4_1.ufo.BOUNDED-10.pals.c [2021-11-21 01:03:05,766 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0537642d-0b8a-4af5-8a6c-b14990b15b9a/bin/utaipan-TEXQjIfE4P/data/3b7417529/9089e39915694d8ea0b9bd2285d9df97/FLAG9cee9db2e [2021-11-21 01:03:06,305 INFO L306 CDTParser]: Found 1 translation units. [2021-11-21 01:03:06,306 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0537642d-0b8a-4af5-8a6c-b14990b15b9a/sv-benchmarks/c/seq-mthreaded/pals_STARTPALS_ActiveStandby.4_1.ufo.BOUNDED-10.pals.c [2021-11-21 01:03:06,317 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0537642d-0b8a-4af5-8a6c-b14990b15b9a/bin/utaipan-TEXQjIfE4P/data/3b7417529/9089e39915694d8ea0b9bd2285d9df97/FLAG9cee9db2e [2021-11-21 01:03:06,650 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0537642d-0b8a-4af5-8a6c-b14990b15b9a/bin/utaipan-TEXQjIfE4P/data/3b7417529/9089e39915694d8ea0b9bd2285d9df97 [2021-11-21 01:03:06,653 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-21 01:03:06,655 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-21 01:03:06,661 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-21 01:03:06,661 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-21 01:03:06,665 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-21 01:03:06,665 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.11 01:03:06" (1/1) ... [2021-11-21 01:03:06,667 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@5c5efe6f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:03:06, skipping insertion in model container [2021-11-21 01:03:06,669 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.11 01:03:06" (1/1) ... [2021-11-21 01:03:06,676 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-21 01:03:06,729 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-21 01:03:06,985 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_0537642d-0b8a-4af5-8a6c-b14990b15b9a/sv-benchmarks/c/seq-mthreaded/pals_STARTPALS_ActiveStandby.4_1.ufo.BOUNDED-10.pals.c[14540,14553] [2021-11-21 01:03:06,988 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-21 01:03:06,997 INFO L203 MainTranslator]: Completed pre-run [2021-11-21 01:03:07,067 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_0537642d-0b8a-4af5-8a6c-b14990b15b9a/sv-benchmarks/c/seq-mthreaded/pals_STARTPALS_ActiveStandby.4_1.ufo.BOUNDED-10.pals.c[14540,14553] [2021-11-21 01:03:07,067 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-21 01:03:07,095 INFO L208 MainTranslator]: Completed translation [2021-11-21 01:03:07,106 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:03:07 WrapperNode [2021-11-21 01:03:07,106 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-21 01:03:07,107 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-21 01:03:07,107 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-21 01:03:07,107 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-21 01:03:07,115 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:03:07" (1/1) ... [2021-11-21 01:03:07,140 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:03:07" (1/1) ... [2021-11-21 01:03:07,188 INFO L137 Inliner]: procedures = 32, calls = 48, calls flagged for inlining = 12, calls inlined = 12, statements flattened = 533 [2021-11-21 01:03:07,189 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-21 01:03:07,189 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-21 01:03:07,190 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-21 01:03:07,190 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-21 01:03:07,206 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:03:07" (1/1) ... [2021-11-21 01:03:07,207 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:03:07" (1/1) ... [2021-11-21 01:03:07,219 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:03:07" (1/1) ... [2021-11-21 01:03:07,220 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:03:07" (1/1) ... [2021-11-21 01:03:07,247 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:03:07" (1/1) ... [2021-11-21 01:03:07,254 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:03:07" (1/1) ... [2021-11-21 01:03:07,256 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:03:07" (1/1) ... [2021-11-21 01:03:07,261 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-21 01:03:07,286 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-21 01:03:07,286 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-21 01:03:07,286 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-21 01:03:07,288 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:03:07" (1/1) ... [2021-11-21 01:03:07,296 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-21 01:03:07,307 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0537642d-0b8a-4af5-8a6c-b14990b15b9a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:03:07,322 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0537642d-0b8a-4af5-8a6c-b14990b15b9a/bin/utaipan-TEXQjIfE4P/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-21 01:03:07,336 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0537642d-0b8a-4af5-8a6c-b14990b15b9a/bin/utaipan-TEXQjIfE4P/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-21 01:03:07,359 INFO L130 BoogieDeclarations]: Found specification of procedure read_manual_selection_history [2021-11-21 01:03:07,359 INFO L138 BoogieDeclarations]: Found implementation of procedure read_manual_selection_history [2021-11-21 01:03:07,359 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-21 01:03:07,360 INFO L130 BoogieDeclarations]: Found specification of procedure read_side2_failed_history [2021-11-21 01:03:07,360 INFO L138 BoogieDeclarations]: Found implementation of procedure read_side2_failed_history [2021-11-21 01:03:07,360 INFO L130 BoogieDeclarations]: Found specification of procedure assert [2021-11-21 01:03:07,360 INFO L138 BoogieDeclarations]: Found implementation of procedure assert [2021-11-21 01:03:07,361 INFO L130 BoogieDeclarations]: Found specification of procedure flip_the_side [2021-11-21 01:03:07,361 INFO L138 BoogieDeclarations]: Found implementation of procedure flip_the_side [2021-11-21 01:03:07,361 INFO L130 BoogieDeclarations]: Found specification of procedure assume_abort_if_not [2021-11-21 01:03:07,361 INFO L138 BoogieDeclarations]: Found implementation of procedure assume_abort_if_not [2021-11-21 01:03:07,361 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-21 01:03:07,362 INFO L130 BoogieDeclarations]: Found specification of procedure read_side1_failed_history [2021-11-21 01:03:07,362 INFO L138 BoogieDeclarations]: Found implementation of procedure read_side1_failed_history [2021-11-21 01:03:07,362 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-21 01:03:07,362 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-21 01:03:07,362 INFO L130 BoogieDeclarations]: Found specification of procedure read_active_side_history [2021-11-21 01:03:07,363 INFO L138 BoogieDeclarations]: Found implementation of procedure read_active_side_history [2021-11-21 01:03:07,467 INFO L236 CfgBuilder]: Building ICFG [2021-11-21 01:03:07,469 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-21 01:03:08,120 INFO L277 CfgBuilder]: Performing block encoding [2021-11-21 01:03:08,407 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-21 01:03:08,407 INFO L301 CfgBuilder]: Removed 1 assume(true) statements. [2021-11-21 01:03:08,410 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.11 01:03:08 BoogieIcfgContainer [2021-11-21 01:03:08,410 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-21 01:03:08,414 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-21 01:03:08,414 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-21 01:03:08,417 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-21 01:03:08,417 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.11 01:03:06" (1/3) ... [2021-11-21 01:03:08,418 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7b60177f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.11 01:03:08, skipping insertion in model container [2021-11-21 01:03:08,418 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 01:03:07" (2/3) ... [2021-11-21 01:03:08,419 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7b60177f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.11 01:03:08, skipping insertion in model container [2021-11-21 01:03:08,419 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.11 01:03:08" (3/3) ... [2021-11-21 01:03:08,420 INFO L111 eAbstractionObserver]: Analyzing ICFG pals_STARTPALS_ActiveStandby.4_1.ufo.BOUNDED-10.pals.c [2021-11-21 01:03:08,429 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-21 01:03:08,429 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-21 01:03:08,494 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-21 01:03:08,501 INFO L339 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mLoopAccelerationTechnique=FAST_UPR [2021-11-21 01:03:08,502 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-21 01:03:08,523 INFO L276 IsEmpty]: Start isEmpty. Operand has 144 states, 104 states have (on average 1.5288461538461537) internal successors, (159), 105 states have internal predecessors, (159), 31 states have call successors, (31), 7 states have call predecessors, (31), 7 states have return successors, (31), 31 states have call predecessors, (31), 31 states have call successors, (31) [2021-11-21 01:03:08,528 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2021-11-21 01:03:08,529 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:03:08,529 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:03:08,530 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:03:08,535 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:03:08,535 INFO L85 PathProgramCache]: Analyzing trace with hash -301559937, now seen corresponding path program 1 times [2021-11-21 01:03:08,544 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:03:08,545 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1332928557] [2021-11-21 01:03:08,546 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:03:08,547 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:03:08,799 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:03:09,003 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:03:09,004 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:03:09,004 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1332928557] [2021-11-21 01:03:09,005 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1332928557] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 01:03:09,005 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 01:03:09,006 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-21 01:03:09,007 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [966818934] [2021-11-21 01:03:09,008 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:03:09,012 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-21 01:03:09,013 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:03:09,047 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-21 01:03:09,048 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-21 01:03:09,053 INFO L87 Difference]: Start difference. First operand has 144 states, 104 states have (on average 1.5288461538461537) internal successors, (159), 105 states have internal predecessors, (159), 31 states have call successors, (31), 7 states have call predecessors, (31), 7 states have return successors, (31), 31 states have call predecessors, (31), 31 states have call successors, (31) Second operand has 4 states, 4 states have (on average 3.75) internal successors, (15), 3 states have internal predecessors, (15), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-21 01:03:09,241 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:03:09,242 INFO L93 Difference]: Finished difference Result 289 states and 469 transitions. [2021-11-21 01:03:09,246 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-21 01:03:09,247 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 3.75) internal successors, (15), 3 states have internal predecessors, (15), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 19 [2021-11-21 01:03:09,248 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:03:09,256 INFO L225 Difference]: With dead ends: 289 [2021-11-21 01:03:09,256 INFO L226 Difference]: Without dead ends: 147 [2021-11-21 01:03:09,262 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 [2021-11-21 01:03:09,265 INFO L933 BasicCegarLoop]: 203 mSDtfsCounter, 5 mSDsluCounter, 418 mSDsCounter, 0 mSdLazyCounter, 57 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 599 SdHoareTripleChecker+Invalid, 60 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 57 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 01:03:09,266 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [5 Valid, 599 Invalid, 60 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 57 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 01:03:09,283 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 147 states. [2021-11-21 01:03:09,322 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 147 to 147. [2021-11-21 01:03:09,324 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 147 states, 107 states have (on average 1.4953271028037383) internal successors, (160), 107 states have internal predecessors, (160), 31 states have call successors, (31), 8 states have call predecessors, (31), 8 states have return successors, (31), 31 states have call predecessors, (31), 31 states have call successors, (31) [2021-11-21 01:03:09,328 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 147 states to 147 states and 222 transitions. [2021-11-21 01:03:09,329 INFO L78 Accepts]: Start accepts. Automaton has 147 states and 222 transitions. Word has length 19 [2021-11-21 01:03:09,330 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:03:09,330 INFO L470 AbstractCegarLoop]: Abstraction has 147 states and 222 transitions. [2021-11-21 01:03:09,330 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 3.75) internal successors, (15), 3 states have internal predecessors, (15), 2 states have call successors, (3), 3 states have call predecessors, (3), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2021-11-21 01:03:09,330 INFO L276 IsEmpty]: Start isEmpty. Operand 147 states and 222 transitions. [2021-11-21 01:03:09,332 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2021-11-21 01:03:09,332 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:03:09,332 INFO L514 BasicCegarLoop]: trace histogram [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] [2021-11-21 01:03:09,333 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-21 01:03:09,333 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:03:09,334 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:03:09,334 INFO L85 PathProgramCache]: Analyzing trace with hash 292308684, now seen corresponding path program 1 times [2021-11-21 01:03:09,334 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:03:09,334 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [75787466] [2021-11-21 01:03:09,335 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:03:09,335 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:03:09,398 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:03:09,526 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-21 01:03:09,526 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:03:09,526 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [75787466] [2021-11-21 01:03:09,527 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [75787466] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 01:03:09,527 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 01:03:09,527 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-21 01:03:09,527 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [612339107] [2021-11-21 01:03:09,527 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:03:09,529 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-21 01:03:09,529 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:03:09,529 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-21 01:03:09,530 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-21 01:03:09,530 INFO L87 Difference]: Start difference. First operand 147 states and 222 transitions. Second operand has 4 states, 4 states have (on average 4.75) internal successors, (19), 3 states have internal predecessors, (19), 2 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) [2021-11-21 01:03:09,651 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:03:09,651 INFO L93 Difference]: Finished difference Result 296 states and 447 transitions. [2021-11-21 01:03:09,653 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-21 01:03:09,653 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 4.75) internal successors, (19), 3 states have internal predecessors, (19), 2 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) Word has length 28 [2021-11-21 01:03:09,653 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:03:09,656 INFO L225 Difference]: With dead ends: 296 [2021-11-21 01:03:09,656 INFO L226 Difference]: Without dead ends: 152 [2021-11-21 01:03:09,657 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-21 01:03:09,659 INFO L933 BasicCegarLoop]: 205 mSDtfsCounter, 6 mSDsluCounter, 426 mSDsCounter, 0 mSdLazyCounter, 45 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 611 SdHoareTripleChecker+Invalid, 46 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 45 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 01:03:09,660 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [6 Valid, 611 Invalid, 46 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 45 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 01:03:09,661 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 152 states. [2021-11-21 01:03:09,691 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 152 to 152. [2021-11-21 01:03:09,692 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 152 states, 111 states have (on average 1.4774774774774775) internal successors, (164), 111 states have internal predecessors, (164), 31 states have call successors, (31), 9 states have call predecessors, (31), 9 states have return successors, (31), 31 states have call predecessors, (31), 31 states have call successors, (31) [2021-11-21 01:03:09,695 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 152 states to 152 states and 226 transitions. [2021-11-21 01:03:09,695 INFO L78 Accepts]: Start accepts. Automaton has 152 states and 226 transitions. Word has length 28 [2021-11-21 01:03:09,696 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:03:09,696 INFO L470 AbstractCegarLoop]: Abstraction has 152 states and 226 transitions. [2021-11-21 01:03:09,696 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 4.75) internal successors, (19), 3 states have internal predecessors, (19), 2 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) [2021-11-21 01:03:09,696 INFO L276 IsEmpty]: Start isEmpty. Operand 152 states and 226 transitions. [2021-11-21 01:03:09,698 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2021-11-21 01:03:09,698 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:03:09,698 INFO L514 BasicCegarLoop]: trace histogram [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] [2021-11-21 01:03:09,698 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-11-21 01:03:09,699 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:03:09,699 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:03:09,699 INFO L85 PathProgramCache]: Analyzing trace with hash -1382943625, now seen corresponding path program 1 times [2021-11-21 01:03:09,699 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:03:09,700 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2070738773] [2021-11-21 01:03:09,700 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:03:09,700 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:03:09,767 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:03:09,884 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-21 01:03:09,884 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:03:09,885 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2070738773] [2021-11-21 01:03:09,885 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2070738773] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 01:03:09,885 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 01:03:09,885 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-21 01:03:09,886 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1138225089] [2021-11-21 01:03:09,887 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:03:09,887 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-21 01:03:09,888 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:03:09,889 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-21 01:03:09,889 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-21 01:03:09,889 INFO L87 Difference]: Start difference. First operand 152 states and 226 transitions. Second operand has 4 states, 4 states have (on average 6.25) internal successors, (25), 3 states have internal predecessors, (25), 2 states have call successors, (6), 3 states have call predecessors, (6), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) [2021-11-21 01:03:09,996 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:03:09,996 INFO L93 Difference]: Finished difference Result 306 states and 458 transitions. [2021-11-21 01:03:09,997 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-21 01:03:09,997 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 6.25) internal successors, (25), 3 states have internal predecessors, (25), 2 states have call successors, (6), 3 states have call predecessors, (6), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) Word has length 36 [2021-11-21 01:03:09,997 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:03:09,999 INFO L225 Difference]: With dead ends: 306 [2021-11-21 01:03:09,999 INFO L226 Difference]: Without dead ends: 157 [2021-11-21 01:03:10,000 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-21 01:03:10,002 INFO L933 BasicCegarLoop]: 202 mSDtfsCounter, 6 mSDsluCounter, 415 mSDsCounter, 0 mSdLazyCounter, 56 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 597 SdHoareTripleChecker+Invalid, 60 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 56 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 01:03:10,003 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [6 Valid, 597 Invalid, 60 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 56 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 01:03:10,004 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 157 states. [2021-11-21 01:03:10,017 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 157 to 157. [2021-11-21 01:03:10,018 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 157 states, 115 states have (on average 1.4608695652173913) internal successors, (168), 115 states have internal predecessors, (168), 31 states have call successors, (31), 10 states have call predecessors, (31), 10 states have return successors, (31), 31 states have call predecessors, (31), 31 states have call successors, (31) [2021-11-21 01:03:10,020 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 157 states to 157 states and 230 transitions. [2021-11-21 01:03:10,021 INFO L78 Accepts]: Start accepts. Automaton has 157 states and 230 transitions. Word has length 36 [2021-11-21 01:03:10,021 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:03:10,021 INFO L470 AbstractCegarLoop]: Abstraction has 157 states and 230 transitions. [2021-11-21 01:03:10,021 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 6.25) internal successors, (25), 3 states have internal predecessors, (25), 2 states have call successors, (6), 3 states have call predecessors, (6), 1 states have return successors, (4), 1 states have call predecessors, (4), 1 states have call successors, (4) [2021-11-21 01:03:10,022 INFO L276 IsEmpty]: Start isEmpty. Operand 157 states and 230 transitions. [2021-11-21 01:03:10,023 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2021-11-21 01:03:10,024 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:03:10,024 INFO L514 BasicCegarLoop]: trace histogram [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] [2021-11-21 01:03:10,024 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-11-21 01:03:10,024 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:03:10,025 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:03:10,025 INFO L85 PathProgramCache]: Analyzing trace with hash 1786441123, now seen corresponding path program 1 times [2021-11-21 01:03:10,025 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:03:10,025 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1459884725] [2021-11-21 01:03:10,025 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:03:10,026 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:03:10,054 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:03:10,112 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-21 01:03:10,112 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:03:10,112 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1459884725] [2021-11-21 01:03:10,112 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1459884725] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 01:03:10,113 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 01:03:10,113 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-21 01:03:10,113 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1076855899] [2021-11-21 01:03:10,113 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:03:10,114 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-21 01:03:10,114 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:03:10,114 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-21 01:03:10,114 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-21 01:03:10,115 INFO L87 Difference]: Start difference. First operand 157 states and 230 transitions. Second operand has 4 states, 4 states have (on average 7.75) internal successors, (31), 3 states have internal predecessors, (31), 2 states have call successors, (7), 3 states have call predecessors, (7), 1 states have return successors, (5), 1 states have call predecessors, (5), 1 states have call successors, (5) [2021-11-21 01:03:10,193 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:03:10,193 INFO L93 Difference]: Finished difference Result 316 states and 466 transitions. [2021-11-21 01:03:10,193 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-21 01:03:10,194 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 7.75) internal successors, (31), 3 states have internal predecessors, (31), 2 states have call successors, (7), 3 states have call predecessors, (7), 1 states have return successors, (5), 1 states have call predecessors, (5), 1 states have call successors, (5) Word has length 44 [2021-11-21 01:03:10,196 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:03:10,198 INFO L225 Difference]: With dead ends: 316 [2021-11-21 01:03:10,199 INFO L226 Difference]: Without dead ends: 162 [2021-11-21 01:03:10,200 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-21 01:03:10,212 INFO L933 BasicCegarLoop]: 202 mSDtfsCounter, 6 mSDsluCounter, 415 mSDsCounter, 0 mSdLazyCounter, 56 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 597 SdHoareTripleChecker+Invalid, 60 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 56 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 01:03:10,213 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [6 Valid, 597 Invalid, 60 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 56 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 01:03:10,215 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 162 states. [2021-11-21 01:03:10,228 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 162 to 162. [2021-11-21 01:03:10,236 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 162 states, 119 states have (on average 1.4453781512605042) internal successors, (172), 119 states have internal predecessors, (172), 31 states have call successors, (31), 11 states have call predecessors, (31), 11 states have return successors, (31), 31 states have call predecessors, (31), 31 states have call successors, (31) [2021-11-21 01:03:10,239 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 162 states to 162 states and 234 transitions. [2021-11-21 01:03:10,240 INFO L78 Accepts]: Start accepts. Automaton has 162 states and 234 transitions. Word has length 44 [2021-11-21 01:03:10,241 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:03:10,241 INFO L470 AbstractCegarLoop]: Abstraction has 162 states and 234 transitions. [2021-11-21 01:03:10,241 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 7.75) internal successors, (31), 3 states have internal predecessors, (31), 2 states have call successors, (7), 3 states have call predecessors, (7), 1 states have return successors, (5), 1 states have call predecessors, (5), 1 states have call successors, (5) [2021-11-21 01:03:10,242 INFO L276 IsEmpty]: Start isEmpty. Operand 162 states and 234 transitions. [2021-11-21 01:03:10,248 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2021-11-21 01:03:10,248 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:03:10,249 INFO L514 BasicCegarLoop]: trace histogram [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] [2021-11-21 01:03:10,249 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-11-21 01:03:10,249 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:03:10,252 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:03:10,252 INFO L85 PathProgramCache]: Analyzing trace with hash -610018180, now seen corresponding path program 1 times [2021-11-21 01:03:10,253 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:03:10,253 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [89038425] [2021-11-21 01:03:10,254 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:03:10,254 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:03:10,307 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:03:10,368 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-21 01:03:10,368 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:03:10,369 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [89038425] [2021-11-21 01:03:10,369 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [89038425] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 01:03:10,370 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 01:03:10,370 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-21 01:03:10,370 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2094970870] [2021-11-21 01:03:10,370 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:03:10,371 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-21 01:03:10,372 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:03:10,375 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-21 01:03:10,376 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-21 01:03:10,376 INFO L87 Difference]: Start difference. First operand 162 states and 234 transitions. Second operand has 4 states, 4 states have (on average 7.75) internal successors, (31), 3 states have internal predecessors, (31), 2 states have call successors, (7), 3 states have call predecessors, (7), 1 states have return successors, (5), 1 states have call predecessors, (5), 1 states have call successors, (5) [2021-11-21 01:03:10,457 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:03:10,457 INFO L93 Difference]: Finished difference Result 325 states and 470 transitions. [2021-11-21 01:03:10,458 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-21 01:03:10,458 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 7.75) internal successors, (31), 3 states have internal predecessors, (31), 2 states have call successors, (7), 3 states have call predecessors, (7), 1 states have return successors, (5), 1 states have call predecessors, (5), 1 states have call successors, (5) Word has length 44 [2021-11-21 01:03:10,458 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:03:10,460 INFO L225 Difference]: With dead ends: 325 [2021-11-21 01:03:10,460 INFO L226 Difference]: Without dead ends: 166 [2021-11-21 01:03:10,461 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-21 01:03:10,462 INFO L933 BasicCegarLoop]: 207 mSDtfsCounter, 5 mSDsluCounter, 419 mSDsCounter, 0 mSdLazyCounter, 51 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 606 SdHoareTripleChecker+Invalid, 52 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 51 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 01:03:10,463 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [5 Valid, 606 Invalid, 52 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 51 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 01:03:10,463 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 166 states. [2021-11-21 01:03:10,474 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 166 to 166. [2021-11-21 01:03:10,474 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 166 states, 122 states have (on average 1.4344262295081966) internal successors, (175), 122 states have internal predecessors, (175), 31 states have call successors, (31), 12 states have call predecessors, (31), 12 states have return successors, (31), 31 states have call predecessors, (31), 31 states have call successors, (31) [2021-11-21 01:03:10,476 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 166 states to 166 states and 237 transitions. [2021-11-21 01:03:10,476 INFO L78 Accepts]: Start accepts. Automaton has 166 states and 237 transitions. Word has length 44 [2021-11-21 01:03:10,477 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:03:10,477 INFO L470 AbstractCegarLoop]: Abstraction has 166 states and 237 transitions. [2021-11-21 01:03:10,477 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 7.75) internal successors, (31), 3 states have internal predecessors, (31), 2 states have call successors, (7), 3 states have call predecessors, (7), 1 states have return successors, (5), 1 states have call predecessors, (5), 1 states have call successors, (5) [2021-11-21 01:03:10,477 INFO L276 IsEmpty]: Start isEmpty. Operand 166 states and 237 transitions. [2021-11-21 01:03:10,479 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 53 [2021-11-21 01:03:10,479 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:03:10,479 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, 1, 1, 1, 1] [2021-11-21 01:03:10,479 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-11-21 01:03:10,480 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:03:10,480 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:03:10,480 INFO L85 PathProgramCache]: Analyzing trace with hash -1818633053, now seen corresponding path program 1 times [2021-11-21 01:03:10,480 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:03:10,480 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [472545441] [2021-11-21 01:03:10,481 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:03:10,481 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:03:10,502 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:03:10,574 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-21 01:03:10,574 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:03:10,574 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [472545441] [2021-11-21 01:03:10,575 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [472545441] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 01:03:10,575 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 01:03:10,575 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-21 01:03:10,575 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [681470969] [2021-11-21 01:03:10,575 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:03:10,576 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-21 01:03:10,576 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:03:10,576 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-21 01:03:10,576 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-21 01:03:10,577 INFO L87 Difference]: Start difference. First operand 166 states and 237 transitions. Second operand has 4 states, 4 states have (on average 8.25) internal successors, (33), 3 states have internal predecessors, (33), 2 states have call successors, (8), 3 states have call predecessors, (8), 1 states have return successors, (6), 1 states have call predecessors, (6), 1 states have call successors, (6) [2021-11-21 01:03:10,651 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:03:10,652 INFO L93 Difference]: Finished difference Result 335 states and 479 transitions. [2021-11-21 01:03:10,652 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-21 01:03:10,652 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 8.25) internal successors, (33), 3 states have internal predecessors, (33), 2 states have call successors, (8), 3 states have call predecessors, (8), 1 states have return successors, (6), 1 states have call predecessors, (6), 1 states have call successors, (6) Word has length 52 [2021-11-21 01:03:10,653 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:03:10,654 INFO L225 Difference]: With dead ends: 335 [2021-11-21 01:03:10,654 INFO L226 Difference]: Without dead ends: 172 [2021-11-21 01:03:10,655 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-21 01:03:10,657 INFO L933 BasicCegarLoop]: 206 mSDtfsCounter, 7 mSDsluCounter, 422 mSDsCounter, 0 mSdLazyCounter, 50 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 608 SdHoareTripleChecker+Invalid, 52 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 50 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 01:03:10,657 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [7 Valid, 608 Invalid, 52 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 50 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 01:03:10,658 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 172 states. [2021-11-21 01:03:10,672 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 172 to 172. [2021-11-21 01:03:10,673 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 172 states, 127 states have (on average 1.4173228346456692) internal successors, (180), 127 states have internal predecessors, (180), 31 states have call successors, (31), 13 states have call predecessors, (31), 13 states have return successors, (31), 31 states have call predecessors, (31), 31 states have call successors, (31) [2021-11-21 01:03:10,676 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 172 states to 172 states and 242 transitions. [2021-11-21 01:03:10,676 INFO L78 Accepts]: Start accepts. Automaton has 172 states and 242 transitions. Word has length 52 [2021-11-21 01:03:10,676 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:03:10,676 INFO L470 AbstractCegarLoop]: Abstraction has 172 states and 242 transitions. [2021-11-21 01:03:10,677 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 8.25) internal successors, (33), 3 states have internal predecessors, (33), 2 states have call successors, (8), 3 states have call predecessors, (8), 1 states have return successors, (6), 1 states have call predecessors, (6), 1 states have call successors, (6) [2021-11-21 01:03:10,677 INFO L276 IsEmpty]: Start isEmpty. Operand 172 states and 242 transitions. [2021-11-21 01:03:10,682 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 56 [2021-11-21 01:03:10,682 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:03:10,682 INFO L514 BasicCegarLoop]: trace histogram [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, 1, 1, 1] [2021-11-21 01:03:10,682 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2021-11-21 01:03:10,683 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:03:10,683 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:03:10,683 INFO L85 PathProgramCache]: Analyzing trace with hash -1171138832, now seen corresponding path program 1 times [2021-11-21 01:03:10,684 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:03:10,685 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1947950787] [2021-11-21 01:03:10,685 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:03:10,685 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:03:10,853 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:03:11,012 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-11-21 01:03:11,013 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:03:11,013 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1947950787] [2021-11-21 01:03:11,013 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1947950787] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:03:11,013 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1288423358] [2021-11-21 01:03:11,014 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:03:11,014 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:03:11,014 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0537642d-0b8a-4af5-8a6c-b14990b15b9a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:03:11,016 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0537642d-0b8a-4af5-8a6c-b14990b15b9a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:03:11,037 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0537642d-0b8a-4af5-8a6c-b14990b15b9a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-21 01:03:11,153 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:03:11,157 INFO L263 TraceCheckSpWp]: Trace formula consists of 372 conjuncts, 13 conjunts are in the unsatisfiable core [2021-11-21 01:03:11,164 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:03:11,475 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 5 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2021-11-21 01:03:11,476 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-21 01:03:11,476 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1288423358] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 01:03:11,476 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-21 01:03:11,476 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [9] total 14 [2021-11-21 01:03:11,476 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1506475947] [2021-11-21 01:03:11,477 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:03:11,478 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-21 01:03:11,478 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:03:11,478 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-21 01:03:11,479 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=151, Unknown=0, NotChecked=0, Total=182 [2021-11-21 01:03:11,479 INFO L87 Difference]: Start difference. First operand 172 states and 242 transitions. Second operand has 8 states, 6 states have (on average 6.666666666666667) internal successors, (40), 8 states have internal predecessors, (40), 4 states have call successors, (8), 3 states have call predecessors, (8), 4 states have return successors, (7), 3 states have call predecessors, (7), 4 states have call successors, (7) [2021-11-21 01:03:11,843 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:03:11,844 INFO L93 Difference]: Finished difference Result 510 states and 710 transitions. [2021-11-21 01:03:11,844 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2021-11-21 01:03:11,844 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 6 states have (on average 6.666666666666667) internal successors, (40), 8 states have internal predecessors, (40), 4 states have call successors, (8), 3 states have call predecessors, (8), 4 states have return successors, (7), 3 states have call predecessors, (7), 4 states have call successors, (7) Word has length 55 [2021-11-21 01:03:11,845 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:03:11,850 INFO L225 Difference]: With dead ends: 510 [2021-11-21 01:03:11,851 INFO L226 Difference]: Without dead ends: 331 [2021-11-21 01:03:11,852 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 51 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=52, Invalid=254, Unknown=0, NotChecked=0, Total=306 [2021-11-21 01:03:11,853 INFO L933 BasicCegarLoop]: 233 mSDtfsCounter, 201 mSDsluCounter, 1064 mSDsCounter, 0 mSdLazyCounter, 237 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 202 SdHoareTripleChecker+Valid, 1256 SdHoareTripleChecker+Invalid, 240 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 237 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-21 01:03:11,853 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [202 Valid, 1256 Invalid, 240 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 237 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-21 01:03:11,855 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 331 states. [2021-11-21 01:03:11,879 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 331 to 327. [2021-11-21 01:03:11,880 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 327 states, 240 states have (on average 1.4083333333333334) internal successors, (338), 241 states have internal predecessors, (338), 60 states have call successors, (60), 26 states have call predecessors, (60), 26 states have return successors, (60), 59 states have call predecessors, (60), 60 states have call successors, (60) [2021-11-21 01:03:11,883 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 327 states to 327 states and 458 transitions. [2021-11-21 01:03:11,884 INFO L78 Accepts]: Start accepts. Automaton has 327 states and 458 transitions. Word has length 55 [2021-11-21 01:03:11,885 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:03:11,885 INFO L470 AbstractCegarLoop]: Abstraction has 327 states and 458 transitions. [2021-11-21 01:03:11,885 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 6 states have (on average 6.666666666666667) internal successors, (40), 8 states have internal predecessors, (40), 4 states have call successors, (8), 3 states have call predecessors, (8), 4 states have return successors, (7), 3 states have call predecessors, (7), 4 states have call successors, (7) [2021-11-21 01:03:11,885 INFO L276 IsEmpty]: Start isEmpty. Operand 327 states and 458 transitions. [2021-11-21 01:03:11,888 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2021-11-21 01:03:11,888 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:03:11,888 INFO L514 BasicCegarLoop]: trace histogram [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, 1, 1, 1, 1, 1] [2021-11-21 01:03:11,930 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0537642d-0b8a-4af5-8a6c-b14990b15b9a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-21 01:03:12,114 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0537642d-0b8a-4af5-8a6c-b14990b15b9a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2021-11-21 01:03:12,114 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:03:12,114 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:03:12,115 INFO L85 PathProgramCache]: Analyzing trace with hash 1285468697, now seen corresponding path program 1 times [2021-11-21 01:03:12,115 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:03:12,115 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [580546430] [2021-11-21 01:03:12,115 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:03:12,115 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:03:12,261 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:03:12,375 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-11-21 01:03:12,376 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:03:12,377 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [580546430] [2021-11-21 01:03:12,378 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [580546430] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:03:12,378 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [518279280] [2021-11-21 01:03:12,378 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:03:12,378 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:03:12,379 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0537642d-0b8a-4af5-8a6c-b14990b15b9a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:03:12,384 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0537642d-0b8a-4af5-8a6c-b14990b15b9a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:03:12,401 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0537642d-0b8a-4af5-8a6c-b14990b15b9a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-21 01:03:12,511 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:03:12,514 INFO L263 TraceCheckSpWp]: Trace formula consists of 392 conjuncts, 17 conjunts are in the unsatisfiable core [2021-11-21 01:03:12,521 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:03:13,009 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 5 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:03:13,009 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:03:13,254 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-11-21 01:03:13,255 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [518279280] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:03:13,255 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2114497380] [2021-11-21 01:03:13,279 INFO L159 IcfgInterpreter]: Started Sifa with 52 locations of interest [2021-11-21 01:03:13,279 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:03:13,285 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:03:13,290 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:03:13,291 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:03:30,601 INFO L197 IcfgInterpreter]: Interpreting procedure read_active_side_history with input of size 153 for LOIs [2021-11-21 01:03:31,842 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 98 for LOIs [2021-11-21 01:03:32,023 INFO L197 IcfgInterpreter]: Interpreting procedure read_manual_selection_history with input of size 92 for LOIs [2021-11-21 01:03:32,700 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:03:39,335 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSifa [2114497380] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 01:03:39,335 INFO L186 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:03:39,335 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [23] imperfect sequences [9, 9, 9] total 35 [2021-11-21 01:03:39,336 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [259985251] [2021-11-21 01:03:39,336 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:03:39,336 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2021-11-21 01:03:39,337 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:03:39,337 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-11-21 01:03:39,338 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=151, Invalid=1039, Unknown=0, NotChecked=0, Total=1190 [2021-11-21 01:03:39,338 INFO L87 Difference]: Start difference. First operand 327 states and 458 transitions. Second operand has 24 states, 20 states have (on average 1.9) internal successors, (38), 16 states have internal predecessors, (38), 5 states have call successors, (8), 4 states have call predecessors, (8), 4 states have return successors, (7), 5 states have call predecessors, (7), 5 states have call successors, (7) [2021-11-21 01:03:45,999 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:03:45,999 INFO L93 Difference]: Finished difference Result 750 states and 1065 transitions. [2021-11-21 01:03:45,999 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-11-21 01:03:46,000 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 20 states have (on average 1.9) internal successors, (38), 16 states have internal predecessors, (38), 5 states have call successors, (8), 4 states have call predecessors, (8), 4 states have return successors, (7), 5 states have call predecessors, (7), 5 states have call successors, (7) Word has length 57 [2021-11-21 01:03:46,000 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:03:46,004 INFO L225 Difference]: With dead ends: 750 [2021-11-21 01:03:46,005 INFO L226 Difference]: Without dead ends: 426 [2021-11-21 01:03:46,006 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 182 GetRequests, 142 SyntacticMatches, 3 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 328 ImplicationChecksByTransitivity, 9.4s TimeCoverageRelationStatistics Valid=183, Invalid=1299, Unknown=0, NotChecked=0, Total=1482 [2021-11-21 01:03:46,007 INFO L933 BasicCegarLoop]: 308 mSDtfsCounter, 209 mSDsluCounter, 3372 mSDsCounter, 0 mSdLazyCounter, 2158 mSolverCounterSat, 77 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 212 SdHoareTripleChecker+Valid, 3664 SdHoareTripleChecker+Invalid, 2235 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 77 IncrementalHoareTripleChecker+Valid, 2158 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.9s IncrementalHoareTripleChecker+Time [2021-11-21 01:03:46,007 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [212 Valid, 3664 Invalid, 2235 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [77 Valid, 2158 Invalid, 0 Unknown, 0 Unchecked, 3.9s Time] [2021-11-21 01:03:46,008 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 426 states. [2021-11-21 01:03:46,038 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 426 to 393. [2021-11-21 01:03:46,040 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 393 states, 288 states have (on average 1.3888888888888888) internal successors, (400), 289 states have internal predecessors, (400), 75 states have call successors, (75), 29 states have call predecessors, (75), 29 states have return successors, (75), 74 states have call predecessors, (75), 75 states have call successors, (75) [2021-11-21 01:03:46,043 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 393 states to 393 states and 550 transitions. [2021-11-21 01:03:46,043 INFO L78 Accepts]: Start accepts. Automaton has 393 states and 550 transitions. Word has length 57 [2021-11-21 01:03:46,044 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:03:46,044 INFO L470 AbstractCegarLoop]: Abstraction has 393 states and 550 transitions. [2021-11-21 01:03:46,044 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 20 states have (on average 1.9) internal successors, (38), 16 states have internal predecessors, (38), 5 states have call successors, (8), 4 states have call predecessors, (8), 4 states have return successors, (7), 5 states have call predecessors, (7), 5 states have call successors, (7) [2021-11-21 01:03:46,044 INFO L276 IsEmpty]: Start isEmpty. Operand 393 states and 550 transitions. [2021-11-21 01:03:46,046 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2021-11-21 01:03:46,046 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:03:46,046 INFO L514 BasicCegarLoop]: trace histogram [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, 1, 1, 1, 1, 1] [2021-11-21 01:03:46,080 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0537642d-0b8a-4af5-8a6c-b14990b15b9a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-21 01:03:46,266 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0537642d-0b8a-4af5-8a6c-b14990b15b9a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable7 [2021-11-21 01:03:46,266 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:03:46,267 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:03:46,267 INFO L85 PathProgramCache]: Analyzing trace with hash 1181010267, now seen corresponding path program 1 times [2021-11-21 01:03:46,267 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:03:46,267 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2137470810] [2021-11-21 01:03:46,267 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:03:46,268 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:03:46,358 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:03:46,468 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-11-21 01:03:46,469 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:03:46,469 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2137470810] [2021-11-21 01:03:46,469 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2137470810] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:03:46,469 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1352582381] [2021-11-21 01:03:46,469 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:03:46,469 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:03:46,470 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0537642d-0b8a-4af5-8a6c-b14990b15b9a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:03:46,478 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0537642d-0b8a-4af5-8a6c-b14990b15b9a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:03:46,498 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0537642d-0b8a-4af5-8a6c-b14990b15b9a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-21 01:03:46,596 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:03:46,599 INFO L263 TraceCheckSpWp]: Trace formula consists of 392 conjuncts, 17 conjunts are in the unsatisfiable core [2021-11-21 01:03:46,602 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:03:46,927 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 5 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:03:46,927 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:03:47,162 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-11-21 01:03:47,162 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1352582381] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:03:47,162 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [308616337] [2021-11-21 01:03:47,166 INFO L159 IcfgInterpreter]: Started Sifa with 52 locations of interest [2021-11-21 01:03:47,166 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:03:47,167 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:03:47,167 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:03:47,167 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:04:06,415 INFO L197 IcfgInterpreter]: Interpreting procedure read_active_side_history with input of size 154 for LOIs [2021-11-21 01:04:07,653 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 98 for LOIs [2021-11-21 01:04:07,842 INFO L197 IcfgInterpreter]: Interpreting procedure read_manual_selection_history with input of size 112 for LOIs [2021-11-21 01:04:09,175 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:04:18,026 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSifa [308616337] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 01:04:18,026 INFO L186 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:04:18,026 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [23] imperfect sequences [9, 9, 9] total 35 [2021-11-21 01:04:18,027 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1803848613] [2021-11-21 01:04:18,027 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:04:18,027 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2021-11-21 01:04:18,027 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:04:18,028 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2021-11-21 01:04:18,028 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=139, Invalid=1051, Unknown=0, NotChecked=0, Total=1190 [2021-11-21 01:04:18,028 INFO L87 Difference]: Start difference. First operand 393 states and 550 transitions. Second operand has 24 states, 20 states have (on average 1.9) internal successors, (38), 16 states have internal predecessors, (38), 5 states have call successors, (8), 4 states have call predecessors, (8), 4 states have return successors, (7), 5 states have call predecessors, (7), 5 states have call successors, (7) [2021-11-21 01:04:22,878 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:04:22,878 INFO L93 Difference]: Finished difference Result 804 states and 1133 transitions. [2021-11-21 01:04:22,882 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2021-11-21 01:04:22,883 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 20 states have (on average 1.9) internal successors, (38), 16 states have internal predecessors, (38), 5 states have call successors, (8), 4 states have call predecessors, (8), 4 states have return successors, (7), 5 states have call predecessors, (7), 5 states have call successors, (7) Word has length 57 [2021-11-21 01:04:22,884 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:04:22,890 INFO L225 Difference]: With dead ends: 804 [2021-11-21 01:04:22,890 INFO L226 Difference]: Without dead ends: 480 [2021-11-21 01:04:22,892 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 179 GetRequests, 142 SyntacticMatches, 3 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 287 ImplicationChecksByTransitivity, 9.9s TimeCoverageRelationStatistics Valid=146, Invalid=1114, Unknown=0, NotChecked=0, Total=1260 [2021-11-21 01:04:22,895 INFO L933 BasicCegarLoop]: 283 mSDtfsCounter, 130 mSDsluCounter, 2865 mSDsCounter, 0 mSdLazyCounter, 1791 mSolverCounterSat, 32 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 153 SdHoareTripleChecker+Valid, 3133 SdHoareTripleChecker+Invalid, 1823 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 32 IncrementalHoareTripleChecker+Valid, 1791 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.8s IncrementalHoareTripleChecker+Time [2021-11-21 01:04:22,895 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [153 Valid, 3133 Invalid, 1823 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [32 Valid, 1791 Invalid, 0 Unknown, 0 Unchecked, 3.8s Time] [2021-11-21 01:04:22,896 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 480 states. [2021-11-21 01:04:22,952 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 480 to 457. [2021-11-21 01:04:22,953 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 457 states, 333 states have (on average 1.3723723723723724) internal successors, (457), 334 states have internal predecessors, (457), 90 states have call successors, (90), 33 states have call predecessors, (90), 33 states have return successors, (90), 89 states have call predecessors, (90), 90 states have call successors, (90) [2021-11-21 01:04:22,956 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 457 states to 457 states and 637 transitions. [2021-11-21 01:04:22,957 INFO L78 Accepts]: Start accepts. Automaton has 457 states and 637 transitions. Word has length 57 [2021-11-21 01:04:22,957 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:04:22,957 INFO L470 AbstractCegarLoop]: Abstraction has 457 states and 637 transitions. [2021-11-21 01:04:22,958 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 20 states have (on average 1.9) internal successors, (38), 16 states have internal predecessors, (38), 5 states have call successors, (8), 4 states have call predecessors, (8), 4 states have return successors, (7), 5 states have call predecessors, (7), 5 states have call successors, (7) [2021-11-21 01:04:22,958 INFO L276 IsEmpty]: Start isEmpty. Operand 457 states and 637 transitions. [2021-11-21 01:04:22,959 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 60 [2021-11-21 01:04:22,959 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:04:22,959 INFO L514 BasicCegarLoop]: trace histogram [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, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:04:22,989 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0537642d-0b8a-4af5-8a6c-b14990b15b9a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-21 01:04:23,178 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0537642d-0b8a-4af5-8a6c-b14990b15b9a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:04:23,178 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:04:23,178 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:04:23,178 INFO L85 PathProgramCache]: Analyzing trace with hash -251167164, now seen corresponding path program 1 times [2021-11-21 01:04:23,178 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:04:23,179 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [443781047] [2021-11-21 01:04:23,179 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:04:23,179 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:04:23,256 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:04:23,350 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-11-21 01:04:23,351 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:04:23,351 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [443781047] [2021-11-21 01:04:23,351 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [443781047] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:04:23,351 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2120881075] [2021-11-21 01:04:23,351 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:04:23,351 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:04:23,352 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0537642d-0b8a-4af5-8a6c-b14990b15b9a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:04:23,354 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0537642d-0b8a-4af5-8a6c-b14990b15b9a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:04:23,374 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0537642d-0b8a-4af5-8a6c-b14990b15b9a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-21 01:04:23,468 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:04:23,470 INFO L263 TraceCheckSpWp]: Trace formula consists of 412 conjuncts, 17 conjunts are in the unsatisfiable core [2021-11-21 01:04:23,474 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:04:23,741 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 5 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:04:23,742 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:04:23,934 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-11-21 01:04:23,934 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2120881075] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:04:23,934 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1849204163] [2021-11-21 01:04:23,940 INFO L159 IcfgInterpreter]: Started Sifa with 54 locations of interest [2021-11-21 01:04:23,940 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:04:23,940 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:04:23,941 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:04:23,941 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:04:41,272 INFO L197 IcfgInterpreter]: Interpreting procedure read_active_side_history with input of size 149 for LOIs [2021-11-21 01:04:42,571 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 98 for LOIs [2021-11-21 01:04:42,746 INFO L197 IcfgInterpreter]: Interpreting procedure read_manual_selection_history with input of size 91 for LOIs [2021-11-21 01:04:43,594 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:04:50,872 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSifa [1849204163] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 01:04:50,873 INFO L186 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:04:50,873 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [25] imperfect sequences [9, 9, 9] total 37 [2021-11-21 01:04:50,873 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1820327212] [2021-11-21 01:04:50,874 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:04:50,875 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2021-11-21 01:04:50,876 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:04:50,877 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2021-11-21 01:04:50,877 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=167, Invalid=1165, Unknown=0, NotChecked=0, Total=1332 [2021-11-21 01:04:50,878 INFO L87 Difference]: Start difference. First operand 457 states and 637 transitions. Second operand has 26 states, 22 states have (on average 1.8181818181818181) internal successors, (40), 18 states have internal predecessors, (40), 5 states have call successors, (8), 4 states have call predecessors, (8), 4 states have return successors, (7), 5 states have call predecessors, (7), 5 states have call successors, (7) [2021-11-21 01:04:58,909 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:04:58,909 INFO L93 Difference]: Finished difference Result 866 states and 1221 transitions. [2021-11-21 01:04:58,909 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2021-11-21 01:04:58,909 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 22 states have (on average 1.8181818181818181) internal successors, (40), 18 states have internal predecessors, (40), 5 states have call successors, (8), 4 states have call predecessors, (8), 4 states have return successors, (7), 5 states have call predecessors, (7), 5 states have call successors, (7) Word has length 59 [2021-11-21 01:04:58,910 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:04:58,913 INFO L225 Difference]: With dead ends: 866 [2021-11-21 01:04:58,913 INFO L226 Difference]: Without dead ends: 542 [2021-11-21 01:04:58,915 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 188 GetRequests, 146 SyntacticMatches, 3 SemanticMatches, 39 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 374 ImplicationChecksByTransitivity, 10.1s TimeCoverageRelationStatistics Valid=198, Invalid=1442, Unknown=0, NotChecked=0, Total=1640 [2021-11-21 01:04:58,915 INFO L933 BasicCegarLoop]: 307 mSDtfsCounter, 135 mSDsluCounter, 4288 mSDsCounter, 0 mSdLazyCounter, 2668 mSolverCounterSat, 56 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 138 SdHoareTripleChecker+Valid, 4574 SdHoareTripleChecker+Invalid, 2724 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 56 IncrementalHoareTripleChecker+Valid, 2668 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 5.2s IncrementalHoareTripleChecker+Time [2021-11-21 01:04:58,917 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [138 Valid, 4574 Invalid, 2724 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [56 Valid, 2668 Invalid, 0 Unknown, 0 Unchecked, 5.2s Time] [2021-11-21 01:04:58,918 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 542 states. [2021-11-21 01:04:58,978 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 542 to 493. [2021-11-21 01:04:58,979 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 493 states, 359 states have (on average 1.3565459610027855) internal successors, (487), 360 states have internal predecessors, (487), 97 states have call successors, (97), 36 states have call predecessors, (97), 36 states have return successors, (97), 96 states have call predecessors, (97), 97 states have call successors, (97) [2021-11-21 01:04:58,982 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 493 states to 493 states and 681 transitions. [2021-11-21 01:04:58,983 INFO L78 Accepts]: Start accepts. Automaton has 493 states and 681 transitions. Word has length 59 [2021-11-21 01:04:58,983 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:04:58,983 INFO L470 AbstractCegarLoop]: Abstraction has 493 states and 681 transitions. [2021-11-21 01:04:58,984 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 22 states have (on average 1.8181818181818181) internal successors, (40), 18 states have internal predecessors, (40), 5 states have call successors, (8), 4 states have call predecessors, (8), 4 states have return successors, (7), 5 states have call predecessors, (7), 5 states have call successors, (7) [2021-11-21 01:04:58,984 INFO L276 IsEmpty]: Start isEmpty. Operand 493 states and 681 transitions. [2021-11-21 01:04:58,985 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 62 [2021-11-21 01:04:58,985 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:04:58,985 INFO L514 BasicCegarLoop]: trace histogram [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, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:04:59,010 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0537642d-0b8a-4af5-8a6c-b14990b15b9a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-21 01:04:59,198 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0537642d-0b8a-4af5-8a6c-b14990b15b9a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2021-11-21 01:04:59,198 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:04:59,198 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:04:59,198 INFO L85 PathProgramCache]: Analyzing trace with hash -800403589, now seen corresponding path program 1 times [2021-11-21 01:04:59,198 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:04:59,199 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [258846761] [2021-11-21 01:04:59,199 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:04:59,199 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:04:59,216 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:04:59,247 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-21 01:04:59,247 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:04:59,248 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [258846761] [2021-11-21 01:04:59,248 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [258846761] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 01:04:59,248 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 01:04:59,248 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-21 01:04:59,248 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [15017298] [2021-11-21 01:04:59,249 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:04:59,249 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-21 01:04:59,249 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:04:59,249 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-21 01:04:59,250 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-21 01:04:59,250 INFO L87 Difference]: Start difference. First operand 493 states and 681 transitions. Second operand has 4 states, 4 states have (on average 10.5) internal successors, (42), 3 states have internal predecessors, (42), 2 states have call successors, (9), 3 states have call predecessors, (9), 1 states have return successors, (7), 1 states have call predecessors, (7), 1 states have call successors, (7) [2021-11-21 01:04:59,358 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:04:59,358 INFO L93 Difference]: Finished difference Result 893 states and 1255 transitions. [2021-11-21 01:04:59,359 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-21 01:04:59,359 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 10.5) internal successors, (42), 3 states have internal predecessors, (42), 2 states have call successors, (9), 3 states have call predecessors, (9), 1 states have return successors, (7), 1 states have call predecessors, (7), 1 states have call successors, (7) Word has length 61 [2021-11-21 01:04:59,359 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:04:59,365 INFO L225 Difference]: With dead ends: 893 [2021-11-21 01:04:59,366 INFO L226 Difference]: Without dead ends: 501 [2021-11-21 01:04:59,367 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-21 01:04:59,368 INFO L933 BasicCegarLoop]: 207 mSDtfsCounter, 5 mSDsluCounter, 419 mSDsCounter, 0 mSdLazyCounter, 51 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 606 SdHoareTripleChecker+Invalid, 52 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 51 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-21 01:04:59,368 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [5 Valid, 606 Invalid, 52 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 51 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-21 01:04:59,369 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 501 states. [2021-11-21 01:04:59,424 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 501 to 501. [2021-11-21 01:04:59,425 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 501 states, 365 states have (on average 1.3506849315068492) internal successors, (493), 366 states have internal predecessors, (493), 97 states have call successors, (97), 38 states have call predecessors, (97), 38 states have return successors, (97), 96 states have call predecessors, (97), 97 states have call successors, (97) [2021-11-21 01:04:59,428 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 501 states to 501 states and 687 transitions. [2021-11-21 01:04:59,429 INFO L78 Accepts]: Start accepts. Automaton has 501 states and 687 transitions. Word has length 61 [2021-11-21 01:04:59,430 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:04:59,430 INFO L470 AbstractCegarLoop]: Abstraction has 501 states and 687 transitions. [2021-11-21 01:04:59,430 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 10.5) internal successors, (42), 3 states have internal predecessors, (42), 2 states have call successors, (9), 3 states have call predecessors, (9), 1 states have return successors, (7), 1 states have call predecessors, (7), 1 states have call successors, (7) [2021-11-21 01:04:59,431 INFO L276 IsEmpty]: Start isEmpty. Operand 501 states and 687 transitions. [2021-11-21 01:04:59,432 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 66 [2021-11-21 01:04:59,433 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:04:59,433 INFO L514 BasicCegarLoop]: trace histogram [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, 1, 1, 1, 1, 1] [2021-11-21 01:04:59,433 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2021-11-21 01:04:59,433 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:04:59,434 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:04:59,434 INFO L85 PathProgramCache]: Analyzing trace with hash 328701673, now seen corresponding path program 1 times [2021-11-21 01:04:59,434 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:04:59,434 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1137279336] [2021-11-21 01:04:59,434 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:04:59,435 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:04:59,519 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:04:59,618 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-21 01:04:59,619 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:04:59,619 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1137279336] [2021-11-21 01:04:59,619 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1137279336] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:04:59,619 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1348110756] [2021-11-21 01:04:59,620 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:04:59,620 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:04:59,620 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0537642d-0b8a-4af5-8a6c-b14990b15b9a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:04:59,621 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0537642d-0b8a-4af5-8a6c-b14990b15b9a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:04:59,630 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0537642d-0b8a-4af5-8a6c-b14990b15b9a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-21 01:04:59,736 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:04:59,738 INFO L263 TraceCheckSpWp]: Trace formula consists of 410 conjuncts, 17 conjunts are in the unsatisfiable core [2021-11-21 01:04:59,740 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:04:59,993 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 10 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-21 01:04:59,994 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:05:00,212 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-21 01:05:00,212 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1348110756] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:05:00,212 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [474326848] [2021-11-21 01:05:00,217 INFO L159 IcfgInterpreter]: Started Sifa with 55 locations of interest [2021-11-21 01:05:00,218 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:05:00,218 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:05:00,219 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:05:00,219 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:05:40,381 INFO L197 IcfgInterpreter]: Interpreting procedure read_active_side_history with input of size 85 for LOIs [2021-11-21 01:05:40,995 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 98 for LOIs [2021-11-21 01:05:41,217 INFO L197 IcfgInterpreter]: Interpreting procedure read_side1_failed_history with input of size 104 for LOIs [2021-11-21 01:05:42,318 INFO L197 IcfgInterpreter]: Interpreting procedure assert with input of size 121 for LOIs [2021-11-21 01:05:43,799 INFO L197 IcfgInterpreter]: Interpreting procedure read_side2_failed_history with input of size 118 for LOIs [2021-11-21 01:05:45,301 INFO L197 IcfgInterpreter]: Interpreting procedure read_manual_selection_history with input of size 112 for LOIs [2021-11-21 01:05:46,714 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:06:13,264 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:06:13,265 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:06:13,265 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 13 [2021-11-21 01:06:13,265 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1515755442] [2021-11-21 01:06:13,265 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:06:13,266 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2021-11-21 01:06:13,266 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:06:13,266 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2021-11-21 01:06:13,268 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=289, Invalid=2573, Unknown=0, NotChecked=0, Total=2862 [2021-11-21 01:06:13,268 INFO L87 Difference]: Start difference. First operand 501 states and 687 transitions. Second operand has 13 states, 9 states have (on average 7.777777777777778) internal successors, (70), 12 states have internal predecessors, (70), 4 states have call successors, (17), 3 states have call predecessors, (17), 8 states have return successors, (18), 4 states have call predecessors, (18), 4 states have call successors, (18) [2021-11-21 01:06:13,783 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:06:13,784 INFO L93 Difference]: Finished difference Result 1221 states and 1699 transitions. [2021-11-21 01:06:13,784 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2021-11-21 01:06:13,784 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 9 states have (on average 7.777777777777778) internal successors, (70), 12 states have internal predecessors, (70), 4 states have call successors, (17), 3 states have call predecessors, (17), 8 states have return successors, (18), 4 states have call predecessors, (18), 4 states have call successors, (18) Word has length 65 [2021-11-21 01:06:13,785 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:06:13,791 INFO L225 Difference]: With dead ends: 1221 [2021-11-21 01:06:13,792 INFO L226 Difference]: Without dead ends: 837 [2021-11-21 01:06:13,794 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 208 GetRequests, 146 SyntacticMatches, 5 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 951 ImplicationChecksByTransitivity, 26.7s TimeCoverageRelationStatistics Valid=320, Invalid=3102, Unknown=0, NotChecked=0, Total=3422 [2021-11-21 01:06:13,795 INFO L933 BasicCegarLoop]: 325 mSDtfsCounter, 297 mSDsluCounter, 2794 mSDsCounter, 0 mSdLazyCounter, 501 mSolverCounterSat, 49 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 322 SdHoareTripleChecker+Valid, 3001 SdHoareTripleChecker+Invalid, 550 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 49 IncrementalHoareTripleChecker+Valid, 501 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2021-11-21 01:06:13,796 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [322 Valid, 3001 Invalid, 550 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [49 Valid, 501 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2021-11-21 01:06:13,797 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 837 states. [2021-11-21 01:06:13,859 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 837 to 529. [2021-11-21 01:06:13,860 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 529 states, 386 states have (on average 1.3160621761658031) internal successors, (508), 389 states have internal predecessors, (508), 95 states have call successors, (95), 47 states have call predecessors, (95), 47 states have return successors, (95), 92 states have call predecessors, (95), 95 states have call successors, (95) [2021-11-21 01:06:13,863 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 529 states to 529 states and 698 transitions. [2021-11-21 01:06:13,863 INFO L78 Accepts]: Start accepts. Automaton has 529 states and 698 transitions. Word has length 65 [2021-11-21 01:06:13,865 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:06:13,865 INFO L470 AbstractCegarLoop]: Abstraction has 529 states and 698 transitions. [2021-11-21 01:06:13,865 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 9 states have (on average 7.777777777777778) internal successors, (70), 12 states have internal predecessors, (70), 4 states have call successors, (17), 3 states have call predecessors, (17), 8 states have return successors, (18), 4 states have call predecessors, (18), 4 states have call successors, (18) [2021-11-21 01:06:13,866 INFO L276 IsEmpty]: Start isEmpty. Operand 529 states and 698 transitions. [2021-11-21 01:06:13,871 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 67 [2021-11-21 01:06:13,871 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:06:13,871 INFO L514 BasicCegarLoop]: trace histogram [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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:06:13,892 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0537642d-0b8a-4af5-8a6c-b14990b15b9a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-21 01:06:14,074 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0537642d-0b8a-4af5-8a6c-b14990b15b9a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:06:14,074 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:06:14,074 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:06:14,074 INFO L85 PathProgramCache]: Analyzing trace with hash 1467150895, now seen corresponding path program 1 times [2021-11-21 01:06:14,074 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:06:14,075 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [309751931] [2021-11-21 01:06:14,075 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:06:14,075 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:06:14,119 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:06:14,198 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-21 01:06:14,198 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:06:14,198 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [309751931] [2021-11-21 01:06:14,198 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [309751931] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 01:06:14,199 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 01:06:14,199 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2021-11-21 01:06:14,199 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [480804205] [2021-11-21 01:06:14,199 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:06:14,200 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-21 01:06:14,200 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:06:14,200 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-21 01:06:14,200 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=41, Unknown=0, NotChecked=0, Total=56 [2021-11-21 01:06:14,201 INFO L87 Difference]: Start difference. First operand 529 states and 698 transitions. Second operand has 8 states, 8 states have (on average 5.625) internal successors, (45), 7 states have internal predecessors, (45), 4 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (8), 5 states have call predecessors, (8), 4 states have call successors, (8) [2021-11-21 01:06:14,867 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:06:14,867 INFO L93 Difference]: Finished difference Result 1167 states and 1611 transitions. [2021-11-21 01:06:14,867 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-21 01:06:14,867 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 5.625) internal successors, (45), 7 states have internal predecessors, (45), 4 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (8), 5 states have call predecessors, (8), 4 states have call successors, (8) Word has length 66 [2021-11-21 01:06:14,868 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:06:14,873 INFO L225 Difference]: With dead ends: 1167 [2021-11-21 01:06:14,873 INFO L226 Difference]: Without dead ends: 861 [2021-11-21 01:06:14,874 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 15 GetRequests, 4 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 16 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=43, Invalid=113, Unknown=0, NotChecked=0, Total=156 [2021-11-21 01:06:14,875 INFO L933 BasicCegarLoop]: 506 mSDtfsCounter, 543 mSDsluCounter, 1754 mSDsCounter, 0 mSdLazyCounter, 622 mSolverCounterSat, 103 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 549 SdHoareTripleChecker+Valid, 2199 SdHoareTripleChecker+Invalid, 725 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 103 IncrementalHoareTripleChecker+Valid, 622 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-21 01:06:14,876 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [549 Valid, 2199 Invalid, 725 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [103 Valid, 622 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-21 01:06:14,877 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 861 states. [2021-11-21 01:06:14,941 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 861 to 657. [2021-11-21 01:06:14,943 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 657 states, 477 states have (on average 1.3123689727463312) internal successors, (626), 480 states have internal predecessors, (626), 119 states have call successors, (119), 60 states have call predecessors, (119), 60 states have return successors, (119), 116 states have call predecessors, (119), 119 states have call successors, (119) [2021-11-21 01:06:14,946 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 657 states to 657 states and 864 transitions. [2021-11-21 01:06:14,946 INFO L78 Accepts]: Start accepts. Automaton has 657 states and 864 transitions. Word has length 66 [2021-11-21 01:06:14,947 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:06:14,947 INFO L470 AbstractCegarLoop]: Abstraction has 657 states and 864 transitions. [2021-11-21 01:06:14,947 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 5.625) internal successors, (45), 7 states have internal predecessors, (45), 4 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (8), 5 states have call predecessors, (8), 4 states have call successors, (8) [2021-11-21 01:06:14,947 INFO L276 IsEmpty]: Start isEmpty. Operand 657 states and 864 transitions. [2021-11-21 01:06:14,948 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2021-11-21 01:06:14,949 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:06:14,949 INFO L514 BasicCegarLoop]: trace histogram [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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:06:14,949 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2021-11-21 01:06:14,949 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:06:14,949 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:06:14,950 INFO L85 PathProgramCache]: Analyzing trace with hash 808727846, now seen corresponding path program 1 times [2021-11-21 01:06:14,950 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:06:14,950 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1218405560] [2021-11-21 01:06:14,950 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:06:14,950 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:06:15,005 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:06:15,082 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-21 01:06:15,082 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:06:15,082 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1218405560] [2021-11-21 01:06:15,082 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1218405560] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 01:06:15,083 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 01:06:15,083 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2021-11-21 01:06:15,083 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [162077174] [2021-11-21 01:06:15,083 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:06:15,084 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2021-11-21 01:06:15,084 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:06:15,085 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2021-11-21 01:06:15,085 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=41, Unknown=0, NotChecked=0, Total=56 [2021-11-21 01:06:15,085 INFO L87 Difference]: Start difference. First operand 657 states and 864 transitions. Second operand has 8 states, 8 states have (on average 5.875) internal successors, (47), 7 states have internal predecessors, (47), 4 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (8), 4 states have call predecessors, (8), 3 states have call successors, (8) [2021-11-21 01:06:15,810 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:06:15,810 INFO L93 Difference]: Finished difference Result 1524 states and 2101 transitions. [2021-11-21 01:06:15,810 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-21 01:06:15,810 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 5.875) internal successors, (47), 7 states have internal predecessors, (47), 4 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (8), 4 states have call predecessors, (8), 3 states have call successors, (8) Word has length 68 [2021-11-21 01:06:15,811 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:06:15,819 INFO L225 Difference]: With dead ends: 1524 [2021-11-21 01:06:15,820 INFO L226 Difference]: Without dead ends: 1194 [2021-11-21 01:06:15,821 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 17 GetRequests, 6 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 17 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=43, Invalid=113, Unknown=0, NotChecked=0, Total=156 [2021-11-21 01:06:15,822 INFO L933 BasicCegarLoop]: 349 mSDtfsCounter, 700 mSDsluCounter, 1407 mSDsCounter, 0 mSdLazyCounter, 598 mSolverCounterSat, 136 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 706 SdHoareTripleChecker+Valid, 1674 SdHoareTripleChecker+Invalid, 734 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 136 IncrementalHoareTripleChecker+Valid, 598 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-21 01:06:15,822 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [706 Valid, 1674 Invalid, 734 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [136 Valid, 598 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2021-11-21 01:06:15,824 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1194 states. [2021-11-21 01:06:15,913 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1194 to 919. [2021-11-21 01:06:15,916 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 919 states, 664 states have (on average 1.3207831325301205) internal successors, (877), 669 states have internal predecessors, (877), 169 states have call successors, (169), 85 states have call predecessors, (169), 85 states have return successors, (169), 164 states have call predecessors, (169), 169 states have call successors, (169) [2021-11-21 01:06:15,921 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 919 states to 919 states and 1215 transitions. [2021-11-21 01:06:15,922 INFO L78 Accepts]: Start accepts. Automaton has 919 states and 1215 transitions. Word has length 68 [2021-11-21 01:06:15,922 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:06:15,923 INFO L470 AbstractCegarLoop]: Abstraction has 919 states and 1215 transitions. [2021-11-21 01:06:15,923 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 5.875) internal successors, (47), 7 states have internal predecessors, (47), 4 states have call successors, (9), 2 states have call predecessors, (9), 2 states have return successors, (8), 4 states have call predecessors, (8), 3 states have call successors, (8) [2021-11-21 01:06:15,923 INFO L276 IsEmpty]: Start isEmpty. Operand 919 states and 1215 transitions. [2021-11-21 01:06:15,924 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2021-11-21 01:06:15,924 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:06:15,925 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:06:15,925 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2021-11-21 01:06:15,925 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:06:15,925 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:06:15,926 INFO L85 PathProgramCache]: Analyzing trace with hash 1785323591, now seen corresponding path program 1 times [2021-11-21 01:06:15,926 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:06:15,926 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [871410866] [2021-11-21 01:06:15,926 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:06:15,926 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:06:15,963 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:06:16,070 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-21 01:06:16,070 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:06:16,071 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [871410866] [2021-11-21 01:06:16,071 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [871410866] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:06:16,071 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [540379596] [2021-11-21 01:06:16,071 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:06:16,071 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:06:16,072 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0537642d-0b8a-4af5-8a6c-b14990b15b9a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:06:16,072 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0537642d-0b8a-4af5-8a6c-b14990b15b9a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:06:16,092 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0537642d-0b8a-4af5-8a6c-b14990b15b9a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-21 01:06:16,188 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:06:16,190 INFO L263 TraceCheckSpWp]: Trace formula consists of 427 conjuncts, 16 conjunts are in the unsatisfiable core [2021-11-21 01:06:16,193 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:06:16,400 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 13 proven. 2 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-21 01:06:16,400 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:06:16,594 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2021-11-21 01:06:16,594 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [540379596] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:06:16,596 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1531475702] [2021-11-21 01:06:16,602 INFO L159 IcfgInterpreter]: Started Sifa with 58 locations of interest [2021-11-21 01:06:16,603 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:06:16,603 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:06:16,603 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:06:16,604 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:06:50,085 INFO L197 IcfgInterpreter]: Interpreting procedure read_active_side_history with input of size 153 for LOIs [2021-11-21 01:06:51,697 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 98 for LOIs [2021-11-21 01:06:51,887 INFO L197 IcfgInterpreter]: Interpreting procedure read_side1_failed_history with input of size 105 for LOIs [2021-11-21 01:06:53,484 INFO L197 IcfgInterpreter]: Interpreting procedure read_manual_selection_history with input of size 112 for LOIs [2021-11-21 01:06:54,937 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:07:17,725 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSifa [1531475702] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 01:07:17,725 INFO L186 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:07:17,725 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [35] imperfect sequences [8, 9, 9] total 47 [2021-11-21 01:07:17,725 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1419628838] [2021-11-21 01:07:17,726 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:07:17,726 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 36 states [2021-11-21 01:07:17,726 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:07:17,726 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2021-11-21 01:07:17,727 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=244, Invalid=1918, Unknown=0, NotChecked=0, Total=2162 [2021-11-21 01:07:17,728 INFO L87 Difference]: Start difference. First operand 919 states and 1215 transitions. Second operand has 36 states, 30 states have (on average 1.4333333333333333) internal successors, (43), 24 states have internal predecessors, (43), 8 states have call successors, (10), 5 states have call predecessors, (10), 5 states have return successors, (9), 8 states have call predecessors, (9), 8 states have call successors, (9) [2021-11-21 01:07:24,444 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:07:24,445 INFO L93 Difference]: Finished difference Result 1541 states and 2065 transitions. [2021-11-21 01:07:24,445 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2021-11-21 01:07:24,446 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 30 states have (on average 1.4333333333333333) internal successors, (43), 24 states have internal predecessors, (43), 8 states have call successors, (10), 5 states have call predecessors, (10), 5 states have return successors, (9), 8 states have call predecessors, (9), 8 states have call successors, (9) Word has length 72 [2021-11-21 01:07:24,446 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:07:24,452 INFO L225 Difference]: With dead ends: 1541 [2021-11-21 01:07:24,452 INFO L226 Difference]: Without dead ends: 958 [2021-11-21 01:07:24,454 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 227 GetRequests, 171 SyntacticMatches, 9 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 660 ImplicationChecksByTransitivity, 24.3s TimeCoverageRelationStatistics Valid=262, Invalid=2090, Unknown=0, NotChecked=0, Total=2352 [2021-11-21 01:07:24,455 INFO L933 BasicCegarLoop]: 237 mSDtfsCounter, 172 mSDsluCounter, 2648 mSDsCounter, 0 mSdLazyCounter, 2569 mSolverCounterSat, 48 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 208 SdHoareTripleChecker+Valid, 2868 SdHoareTripleChecker+Invalid, 2617 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 48 IncrementalHoareTripleChecker+Valid, 2569 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 5.2s IncrementalHoareTripleChecker+Time [2021-11-21 01:07:24,455 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [208 Valid, 2868 Invalid, 2617 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [48 Valid, 2569 Invalid, 0 Unknown, 0 Unchecked, 5.2s Time] [2021-11-21 01:07:24,457 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 958 states. [2021-11-21 01:07:24,553 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 958 to 922. [2021-11-21 01:07:24,556 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 922 states, 666 states have (on average 1.3198198198198199) internal successors, (879), 671 states have internal predecessors, (879), 170 states have call successors, (170), 85 states have call predecessors, (170), 85 states have return successors, (170), 165 states have call predecessors, (170), 170 states have call successors, (170) [2021-11-21 01:07:24,560 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 922 states to 922 states and 1219 transitions. [2021-11-21 01:07:24,560 INFO L78 Accepts]: Start accepts. Automaton has 922 states and 1219 transitions. Word has length 72 [2021-11-21 01:07:24,561 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:07:24,561 INFO L470 AbstractCegarLoop]: Abstraction has 922 states and 1219 transitions. [2021-11-21 01:07:24,561 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 36 states, 30 states have (on average 1.4333333333333333) internal successors, (43), 24 states have internal predecessors, (43), 8 states have call successors, (10), 5 states have call predecessors, (10), 5 states have return successors, (9), 8 states have call predecessors, (9), 8 states have call successors, (9) [2021-11-21 01:07:24,561 INFO L276 IsEmpty]: Start isEmpty. Operand 922 states and 1219 transitions. [2021-11-21 01:07:24,563 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2021-11-21 01:07:24,563 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:07:24,563 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:07:24,601 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0537642d-0b8a-4af5-8a6c-b14990b15b9a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-21 01:07:24,778 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0537642d-0b8a-4af5-8a6c-b14990b15b9a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:07:24,778 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:07:24,778 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:07:24,778 INFO L85 PathProgramCache]: Analyzing trace with hash 778968261, now seen corresponding path program 1 times [2021-11-21 01:07:24,778 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:07:24,779 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [454916120] [2021-11-21 01:07:24,779 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:07:24,779 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:07:24,817 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:07:24,937 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-21 01:07:24,937 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:07:24,937 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [454916120] [2021-11-21 01:07:24,937 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [454916120] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:07:24,938 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1558554698] [2021-11-21 01:07:24,938 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:07:24,938 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:07:24,938 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0537642d-0b8a-4af5-8a6c-b14990b15b9a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:07:24,942 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0537642d-0b8a-4af5-8a6c-b14990b15b9a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:07:24,962 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0537642d-0b8a-4af5-8a6c-b14990b15b9a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-21 01:07:25,061 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:07:25,064 INFO L263 TraceCheckSpWp]: Trace formula consists of 427 conjuncts, 16 conjunts are in the unsatisfiable core [2021-11-21 01:07:25,066 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:07:25,267 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 13 proven. 2 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-21 01:07:25,267 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:07:25,464 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2021-11-21 01:07:25,465 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1558554698] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:07:25,465 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1543992975] [2021-11-21 01:07:25,468 INFO L159 IcfgInterpreter]: Started Sifa with 58 locations of interest [2021-11-21 01:07:25,468 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:07:25,469 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:07:25,469 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:07:25,469 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:08:05,425 INFO L197 IcfgInterpreter]: Interpreting procedure read_active_side_history with input of size 153 for LOIs [2021-11-21 01:08:06,838 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 98 for LOIs [2021-11-21 01:08:07,067 INFO L197 IcfgInterpreter]: Interpreting procedure read_side1_failed_history with input of size 120 for LOIs [2021-11-21 01:08:08,646 INFO L197 IcfgInterpreter]: Interpreting procedure read_manual_selection_history with input of size 112 for LOIs [2021-11-21 01:08:10,198 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:08:30,001 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSifa [1543992975] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 01:08:30,001 INFO L186 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:08:30,002 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [35] imperfect sequences [8, 9, 9] total 47 [2021-11-21 01:08:30,002 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1157463555] [2021-11-21 01:08:30,002 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:08:30,003 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 36 states [2021-11-21 01:08:30,003 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:08:30,003 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 36 interpolants. [2021-11-21 01:08:30,004 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=248, Invalid=1914, Unknown=0, NotChecked=0, Total=2162 [2021-11-21 01:08:30,004 INFO L87 Difference]: Start difference. First operand 922 states and 1219 transitions. Second operand has 36 states, 30 states have (on average 1.4333333333333333) internal successors, (43), 24 states have internal predecessors, (43), 8 states have call successors, (10), 5 states have call predecessors, (10), 5 states have return successors, (9), 8 states have call predecessors, (9), 8 states have call successors, (9) [2021-11-21 01:08:35,580 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:08:35,580 INFO L93 Difference]: Finished difference Result 1491 states and 1988 transitions. [2021-11-21 01:08:35,580 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 36 states. [2021-11-21 01:08:35,581 INFO L78 Accepts]: Start accepts. Automaton has has 36 states, 30 states have (on average 1.4333333333333333) internal successors, (43), 24 states have internal predecessors, (43), 8 states have call successors, (10), 5 states have call predecessors, (10), 5 states have return successors, (9), 8 states have call predecessors, (9), 8 states have call successors, (9) Word has length 72 [2021-11-21 01:08:35,581 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:08:35,587 INFO L225 Difference]: With dead ends: 1491 [2021-11-21 01:08:35,587 INFO L226 Difference]: Without dead ends: 908 [2021-11-21 01:08:35,590 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 227 GetRequests, 172 SyntacticMatches, 8 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 652 ImplicationChecksByTransitivity, 21.3s TimeCoverageRelationStatistics Valid=265, Invalid=2087, Unknown=0, NotChecked=0, Total=2352 [2021-11-21 01:08:35,591 INFO L933 BasicCegarLoop]: 255 mSDtfsCounter, 95 mSDsluCounter, 3241 mSDsCounter, 0 mSdLazyCounter, 2196 mSolverCounterSat, 34 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 113 SdHoareTripleChecker+Valid, 3478 SdHoareTripleChecker+Invalid, 2230 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 34 IncrementalHoareTripleChecker+Valid, 2196 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.0s IncrementalHoareTripleChecker+Time [2021-11-21 01:08:35,591 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [113 Valid, 3478 Invalid, 2230 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [34 Valid, 2196 Invalid, 0 Unknown, 0 Unchecked, 4.0s Time] [2021-11-21 01:08:35,593 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 908 states. [2021-11-21 01:08:35,694 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 908 to 908. [2021-11-21 01:08:35,696 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 908 states, 656 states have (on average 1.3185975609756098) internal successors, (865), 661 states have internal predecessors, (865), 167 states have call successors, (167), 84 states have call predecessors, (167), 84 states have return successors, (167), 162 states have call predecessors, (167), 167 states have call successors, (167) [2021-11-21 01:08:35,701 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 908 states to 908 states and 1199 transitions. [2021-11-21 01:08:35,701 INFO L78 Accepts]: Start accepts. Automaton has 908 states and 1199 transitions. Word has length 72 [2021-11-21 01:08:35,702 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:08:35,702 INFO L470 AbstractCegarLoop]: Abstraction has 908 states and 1199 transitions. [2021-11-21 01:08:35,702 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 36 states, 30 states have (on average 1.4333333333333333) internal successors, (43), 24 states have internal predecessors, (43), 8 states have call successors, (10), 5 states have call predecessors, (10), 5 states have return successors, (9), 8 states have call predecessors, (9), 8 states have call successors, (9) [2021-11-21 01:08:35,703 INFO L276 IsEmpty]: Start isEmpty. Operand 908 states and 1199 transitions. [2021-11-21 01:08:35,704 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2021-11-21 01:08:35,704 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:08:35,704 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:08:35,738 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0537642d-0b8a-4af5-8a6c-b14990b15b9a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-11-21 01:08:35,918 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0537642d-0b8a-4af5-8a6c-b14990b15b9a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2021-11-21 01:08:35,918 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:08:35,918 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:08:35,919 INFO L85 PathProgramCache]: Analyzing trace with hash -1991255876, now seen corresponding path program 1 times [2021-11-21 01:08:35,919 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:08:35,919 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1123457668] [2021-11-21 01:08:35,919 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:08:35,919 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:08:35,946 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:08:36,056 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-21 01:08:36,057 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:08:36,057 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1123457668] [2021-11-21 01:08:36,057 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1123457668] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:08:36,057 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2001163073] [2021-11-21 01:08:36,057 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:08:36,058 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:08:36,058 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0537642d-0b8a-4af5-8a6c-b14990b15b9a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:08:36,066 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0537642d-0b8a-4af5-8a6c-b14990b15b9a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:08:36,086 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0537642d-0b8a-4af5-8a6c-b14990b15b9a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-11-21 01:08:36,189 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:08:36,192 INFO L263 TraceCheckSpWp]: Trace formula consists of 447 conjuncts, 16 conjunts are in the unsatisfiable core [2021-11-21 01:08:36,194 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:08:36,408 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 13 proven. 2 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-21 01:08:36,408 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:08:36,652 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2021-11-21 01:08:36,653 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2001163073] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:08:36,653 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1195997372] [2021-11-21 01:08:36,655 INFO L159 IcfgInterpreter]: Started Sifa with 60 locations of interest [2021-11-21 01:08:36,656 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:08:36,656 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:08:36,656 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:08:36,657 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:09:20,100 INFO L197 IcfgInterpreter]: Interpreting procedure read_active_side_history with input of size 149 for LOIs [2021-11-21 01:09:21,438 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 98 for LOIs [2021-11-21 01:09:21,678 INFO L197 IcfgInterpreter]: Interpreting procedure read_side1_failed_history with input of size 118 for LOIs [2021-11-21 01:09:23,249 INFO L197 IcfgInterpreter]: Interpreting procedure read_manual_selection_history with input of size 111 for LOIs [2021-11-21 01:09:24,624 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:09:45,397 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSifa [1195997372] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 01:09:45,397 INFO L186 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:09:45,398 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [37] imperfect sequences [8, 9, 9] total 49 [2021-11-21 01:09:45,398 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1904658080] [2021-11-21 01:09:45,398 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:09:45,399 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 38 states [2021-11-21 01:09:45,399 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:09:45,400 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2021-11-21 01:09:45,401 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=258, Invalid=2094, Unknown=0, NotChecked=0, Total=2352 [2021-11-21 01:09:45,401 INFO L87 Difference]: Start difference. First operand 908 states and 1199 transitions. Second operand has 38 states, 32 states have (on average 1.40625) internal successors, (45), 26 states have internal predecessors, (45), 8 states have call successors, (10), 5 states have call predecessors, (10), 5 states have return successors, (9), 8 states have call predecessors, (9), 8 states have call successors, (9) [2021-11-21 01:09:52,242 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:09:52,242 INFO L93 Difference]: Finished difference Result 1530 states and 2049 transitions. [2021-11-21 01:09:52,243 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2021-11-21 01:09:52,243 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 32 states have (on average 1.40625) internal successors, (45), 26 states have internal predecessors, (45), 8 states have call successors, (10), 5 states have call predecessors, (10), 5 states have return successors, (9), 8 states have call predecessors, (9), 8 states have call successors, (9) Word has length 74 [2021-11-21 01:09:52,244 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:09:52,248 INFO L225 Difference]: With dead ends: 1530 [2021-11-21 01:09:52,248 INFO L226 Difference]: Without dead ends: 947 [2021-11-21 01:09:52,251 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 233 GetRequests, 176 SyntacticMatches, 8 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 703 ImplicationChecksByTransitivity, 22.3s TimeCoverageRelationStatistics Valid=275, Invalid=2275, Unknown=0, NotChecked=0, Total=2550 [2021-11-21 01:09:52,252 INFO L933 BasicCegarLoop]: 324 mSDtfsCounter, 247 mSDsluCounter, 3842 mSDsCounter, 0 mSdLazyCounter, 2827 mSolverCounterSat, 76 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 284 SdHoareTripleChecker+Valid, 4150 SdHoareTripleChecker+Invalid, 2903 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 76 IncrementalHoareTripleChecker+Valid, 2827 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 5.3s IncrementalHoareTripleChecker+Time [2021-11-21 01:09:52,252 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [284 Valid, 4150 Invalid, 2903 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [76 Valid, 2827 Invalid, 0 Unknown, 0 Unchecked, 5.3s Time] [2021-11-21 01:09:52,254 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 947 states. [2021-11-21 01:09:52,381 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 947 to 911. [2021-11-21 01:09:52,384 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 911 states, 658 states have (on average 1.317629179331307) internal successors, (867), 663 states have internal predecessors, (867), 168 states have call successors, (168), 84 states have call predecessors, (168), 84 states have return successors, (168), 163 states have call predecessors, (168), 168 states have call successors, (168) [2021-11-21 01:09:52,388 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 911 states to 911 states and 1203 transitions. [2021-11-21 01:09:52,389 INFO L78 Accepts]: Start accepts. Automaton has 911 states and 1203 transitions. Word has length 74 [2021-11-21 01:09:52,389 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:09:52,389 INFO L470 AbstractCegarLoop]: Abstraction has 911 states and 1203 transitions. [2021-11-21 01:09:52,390 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 38 states, 32 states have (on average 1.40625) internal successors, (45), 26 states have internal predecessors, (45), 8 states have call successors, (10), 5 states have call predecessors, (10), 5 states have return successors, (9), 8 states have call predecessors, (9), 8 states have call successors, (9) [2021-11-21 01:09:52,390 INFO L276 IsEmpty]: Start isEmpty. Operand 911 states and 1203 transitions. [2021-11-21 01:09:52,398 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2021-11-21 01:09:52,398 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:09:52,399 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:09:52,436 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0537642d-0b8a-4af5-8a6c-b14990b15b9a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Ended with exit code 0 [2021-11-21 01:09:52,606 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0537642d-0b8a-4af5-8a6c-b14990b15b9a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2021-11-21 01:09:52,606 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:09:52,606 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:09:52,606 INFO L85 PathProgramCache]: Analyzing trace with hash -1787309115, now seen corresponding path program 1 times [2021-11-21 01:09:52,606 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:09:52,607 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1804928410] [2021-11-21 01:09:52,607 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:09:52,607 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:09:52,634 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:09:52,692 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 33 trivial. 0 not checked. [2021-11-21 01:09:52,693 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:09:52,693 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1804928410] [2021-11-21 01:09:52,693 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1804928410] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 01:09:52,693 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 01:09:52,693 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-21 01:09:52,694 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [118890614] [2021-11-21 01:09:52,694 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:09:52,694 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-21 01:09:52,694 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:09:52,695 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-21 01:09:52,695 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-21 01:09:52,695 INFO L87 Difference]: Start difference. First operand 911 states and 1203 transitions. Second operand has 6 states, 5 states have (on average 8.6) internal successors, (43), 5 states have internal predecessors, (43), 2 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (9), 1 states have call predecessors, (9), 1 states have call successors, (9) [2021-11-21 01:09:52,910 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:09:52,911 INFO L93 Difference]: Finished difference Result 1200 states and 1657 transitions. [2021-11-21 01:09:52,911 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-21 01:09:52,911 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 8.6) internal successors, (43), 5 states have internal predecessors, (43), 2 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (9), 1 states have call predecessors, (9), 1 states have call successors, (9) Word has length 75 [2021-11-21 01:09:52,912 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:09:52,920 INFO L225 Difference]: With dead ends: 1200 [2021-11-21 01:09:52,920 INFO L226 Difference]: Without dead ends: 1198 [2021-11-21 01:09:52,921 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2021-11-21 01:09:52,922 INFO L933 BasicCegarLoop]: 315 mSDtfsCounter, 153 mSDsluCounter, 1197 mSDsCounter, 0 mSdLazyCounter, 112 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 175 SdHoareTripleChecker+Valid, 1460 SdHoareTripleChecker+Invalid, 120 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 112 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2021-11-21 01:09:52,922 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [175 Valid, 1460 Invalid, 120 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 112 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2021-11-21 01:09:52,924 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1198 states. [2021-11-21 01:09:53,044 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1198 to 919. [2021-11-21 01:09:53,046 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 919 states, 662 states have (on average 1.3157099697885197) internal successors, (871), 669 states have internal predecessors, (871), 170 states have call successors, (170), 86 states have call predecessors, (170), 86 states have return successors, (170), 163 states have call predecessors, (170), 170 states have call successors, (170) [2021-11-21 01:09:53,057 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 919 states to 919 states and 1211 transitions. [2021-11-21 01:09:53,058 INFO L78 Accepts]: Start accepts. Automaton has 919 states and 1211 transitions. Word has length 75 [2021-11-21 01:09:53,058 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:09:53,058 INFO L470 AbstractCegarLoop]: Abstraction has 919 states and 1211 transitions. [2021-11-21 01:09:53,058 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 8.6) internal successors, (43), 5 states have internal predecessors, (43), 2 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (9), 1 states have call predecessors, (9), 1 states have call successors, (9) [2021-11-21 01:09:53,059 INFO L276 IsEmpty]: Start isEmpty. Operand 919 states and 1211 transitions. [2021-11-21 01:09:53,060 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2021-11-21 01:09:53,060 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:09:53,060 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:09:53,061 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2021-11-21 01:09:53,061 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:09:53,061 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:09:53,061 INFO L85 PathProgramCache]: Analyzing trace with hash -928936137, now seen corresponding path program 1 times [2021-11-21 01:09:53,062 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:09:53,062 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1497614562] [2021-11-21 01:09:53,062 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:09:53,062 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:09:53,081 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:09:53,140 INFO L134 CoverageAnalysis]: Checked inductivity of 36 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 33 trivial. 0 not checked. [2021-11-21 01:09:53,140 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:09:53,140 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1497614562] [2021-11-21 01:09:53,141 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1497614562] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 01:09:53,141 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-21 01:09:53,141 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-21 01:09:53,141 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [890454195] [2021-11-21 01:09:53,141 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:09:53,143 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-21 01:09:53,143 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:09:53,143 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-21 01:09:53,143 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-21 01:09:53,144 INFO L87 Difference]: Start difference. First operand 919 states and 1211 transitions. Second operand has 4 states, 4 states have (on average 11.25) internal successors, (45), 3 states have internal predecessors, (45), 2 states have call successors, (11), 3 states have call predecessors, (11), 1 states have return successors, (9), 1 states have call predecessors, (9), 1 states have call successors, (9) [2021-11-21 01:09:53,290 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:09:53,291 INFO L93 Difference]: Finished difference Result 1585 states and 2099 transitions. [2021-11-21 01:09:53,291 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-21 01:09:53,291 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 11.25) internal successors, (45), 3 states have internal predecessors, (45), 2 states have call successors, (11), 3 states have call predecessors, (11), 1 states have return successors, (9), 1 states have call predecessors, (9), 1 states have call successors, (9) Word has length 78 [2021-11-21 01:09:53,292 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:09:53,297 INFO L225 Difference]: With dead ends: 1585 [2021-11-21 01:09:53,298 INFO L226 Difference]: Without dead ends: 907 [2021-11-21 01:09:53,300 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 5 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-21 01:09:53,301 INFO L933 BasicCegarLoop]: 202 mSDtfsCounter, 7 mSDsluCounter, 416 mSDsCounter, 0 mSdLazyCounter, 42 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 598 SdHoareTripleChecker+Invalid, 44 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 42 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2021-11-21 01:09:53,301 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [7 Valid, 598 Invalid, 44 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 42 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2021-11-21 01:09:53,303 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 907 states. [2021-11-21 01:09:53,435 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 907 to 907. [2021-11-21 01:09:53,437 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 907 states, 656 states have (on average 1.291158536585366) internal successors, (847), 663 states have internal predecessors, (847), 164 states have call successors, (164), 86 states have call predecessors, (164), 86 states have return successors, (164), 157 states have call predecessors, (164), 164 states have call successors, (164) [2021-11-21 01:09:53,440 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 907 states to 907 states and 1175 transitions. [2021-11-21 01:09:53,441 INFO L78 Accepts]: Start accepts. Automaton has 907 states and 1175 transitions. Word has length 78 [2021-11-21 01:09:53,441 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:09:53,441 INFO L470 AbstractCegarLoop]: Abstraction has 907 states and 1175 transitions. [2021-11-21 01:09:53,441 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 11.25) internal successors, (45), 3 states have internal predecessors, (45), 2 states have call successors, (11), 3 states have call predecessors, (11), 1 states have return successors, (9), 1 states have call predecessors, (9), 1 states have call successors, (9) [2021-11-21 01:09:53,442 INFO L276 IsEmpty]: Start isEmpty. Operand 907 states and 1175 transitions. [2021-11-21 01:09:53,444 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2021-11-21 01:09:53,445 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:09:53,445 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:09:53,445 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2021-11-21 01:09:53,445 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:09:53,446 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:09:53,446 INFO L85 PathProgramCache]: Analyzing trace with hash -1500524137, now seen corresponding path program 1 times [2021-11-21 01:09:53,446 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:09:53,446 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [719583874] [2021-11-21 01:09:53,446 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:09:53,447 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:09:53,479 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:09:53,589 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2021-11-21 01:09:53,589 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:09:53,589 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [719583874] [2021-11-21 01:09:53,589 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [719583874] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:09:53,589 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1379105247] [2021-11-21 01:09:53,590 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:09:53,590 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:09:53,590 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0537642d-0b8a-4af5-8a6c-b14990b15b9a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:09:53,594 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0537642d-0b8a-4af5-8a6c-b14990b15b9a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:09:53,613 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0537642d-0b8a-4af5-8a6c-b14990b15b9a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-11-21 01:09:53,717 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:09:53,720 INFO L263 TraceCheckSpWp]: Trace formula consists of 445 conjuncts, 16 conjunts are in the unsatisfiable core [2021-11-21 01:09:53,723 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:09:53,962 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 18 proven. 2 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-21 01:09:53,962 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:09:54,224 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-11-21 01:09:54,224 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1379105247] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:09:54,224 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [706057680] [2021-11-21 01:09:54,227 INFO L159 IcfgInterpreter]: Started Sifa with 61 locations of interest [2021-11-21 01:09:54,227 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:09:54,227 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:09:54,227 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:09:54,227 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:10:33,440 INFO L197 IcfgInterpreter]: Interpreting procedure read_active_side_history with input of size 153 for LOIs [2021-11-21 01:10:34,842 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 98 for LOIs [2021-11-21 01:10:35,017 INFO L197 IcfgInterpreter]: Interpreting procedure read_side1_failed_history with input of size 105 for LOIs [2021-11-21 01:10:36,659 INFO L197 IcfgInterpreter]: Interpreting procedure read_side2_failed_history with input of size 123 for LOIs [2021-11-21 01:10:38,214 INFO L197 IcfgInterpreter]: Interpreting procedure read_manual_selection_history with input of size 112 for LOIs [2021-11-21 01:10:39,835 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:11:07,001 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSifa [706057680] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 01:11:07,002 INFO L186 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:11:07,002 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [41] imperfect sequences [8, 9, 9] total 53 [2021-11-21 01:11:07,003 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [57618835] [2021-11-21 01:11:07,003 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:11:07,003 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 42 states [2021-11-21 01:11:07,004 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:11:07,004 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 42 interpolants. [2021-11-21 01:11:07,005 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=312, Invalid=2444, Unknown=0, NotChecked=0, Total=2756 [2021-11-21 01:11:07,006 INFO L87 Difference]: Start difference. First operand 907 states and 1175 transitions. Second operand has 42 states, 35 states have (on average 1.2857142857142858) internal successors, (45), 28 states have internal predecessors, (45), 9 states have call successors, (11), 6 states have call predecessors, (11), 5 states have return successors, (10), 9 states have call predecessors, (10), 9 states have call successors, (10) [2021-11-21 01:11:15,107 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:11:15,108 INFO L93 Difference]: Finished difference Result 1576 states and 2076 transitions. [2021-11-21 01:11:15,108 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2021-11-21 01:11:15,108 INFO L78 Accepts]: Start accepts. Automaton has has 42 states, 35 states have (on average 1.2857142857142858) internal successors, (45), 28 states have internal predecessors, (45), 9 states have call successors, (11), 6 states have call predecessors, (11), 5 states have return successors, (10), 9 states have call predecessors, (10), 9 states have call successors, (10) Word has length 80 [2021-11-21 01:11:15,109 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:11:15,113 INFO L225 Difference]: With dead ends: 1576 [2021-11-21 01:11:15,114 INFO L226 Difference]: Without dead ends: 991 [2021-11-21 01:11:15,116 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 251 GetRequests, 189 SyntacticMatches, 9 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 807 ImplicationChecksByTransitivity, 28.7s TimeCoverageRelationStatistics Valid=330, Invalid=2640, Unknown=0, NotChecked=0, Total=2970 [2021-11-21 01:11:15,117 INFO L933 BasicCegarLoop]: 255 mSDtfsCounter, 277 mSDsluCounter, 3215 mSDsCounter, 0 mSdLazyCounter, 3408 mSolverCounterSat, 105 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 5.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 326 SdHoareTripleChecker+Valid, 3452 SdHoareTripleChecker+Invalid, 3513 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 105 IncrementalHoareTripleChecker+Valid, 3408 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 6.5s IncrementalHoareTripleChecker+Time [2021-11-21 01:11:15,117 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [326 Valid, 3452 Invalid, 3513 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [105 Valid, 3408 Invalid, 0 Unknown, 0 Unchecked, 6.5s Time] [2021-11-21 01:11:15,119 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 991 states. [2021-11-21 01:11:15,249 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 991 to 942. [2021-11-21 01:11:15,252 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 942 states, 679 states have (on average 1.2916053019145803) internal successors, (877), 687 states have internal predecessors, (877), 175 states have call successors, (175), 87 states have call predecessors, (175), 87 states have return successors, (175), 167 states have call predecessors, (175), 175 states have call successors, (175) [2021-11-21 01:11:15,255 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 942 states to 942 states and 1227 transitions. [2021-11-21 01:11:15,255 INFO L78 Accepts]: Start accepts. Automaton has 942 states and 1227 transitions. Word has length 80 [2021-11-21 01:11:15,256 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:11:15,256 INFO L470 AbstractCegarLoop]: Abstraction has 942 states and 1227 transitions. [2021-11-21 01:11:15,256 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 42 states, 35 states have (on average 1.2857142857142858) internal successors, (45), 28 states have internal predecessors, (45), 9 states have call successors, (11), 6 states have call predecessors, (11), 5 states have return successors, (10), 9 states have call predecessors, (10), 9 states have call successors, (10) [2021-11-21 01:11:15,256 INFO L276 IsEmpty]: Start isEmpty. Operand 942 states and 1227 transitions. [2021-11-21 01:11:15,258 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2021-11-21 01:11:15,258 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:11:15,259 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:11:15,296 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0537642d-0b8a-4af5-8a6c-b14990b15b9a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2021-11-21 01:11:15,474 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0537642d-0b8a-4af5-8a6c-b14990b15b9a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:11:15,474 INFO L402 AbstractCegarLoop]: === Iteration 21 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:11:15,474 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:11:15,474 INFO L85 PathProgramCache]: Analyzing trace with hash 438889773, now seen corresponding path program 1 times [2021-11-21 01:11:15,474 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:11:15,474 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [326155680] [2021-11-21 01:11:15,475 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:11:15,475 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:11:15,515 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:11:15,599 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 27 trivial. 0 not checked. [2021-11-21 01:11:15,599 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:11:15,599 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [326155680] [2021-11-21 01:11:15,599 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [326155680] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:11:15,600 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1217351996] [2021-11-21 01:11:15,600 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:11:15,600 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:11:15,600 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0537642d-0b8a-4af5-8a6c-b14990b15b9a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:11:15,601 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0537642d-0b8a-4af5-8a6c-b14990b15b9a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:11:15,609 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0537642d-0b8a-4af5-8a6c-b14990b15b9a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-11-21 01:11:15,721 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:11:15,723 INFO L263 TraceCheckSpWp]: Trace formula consists of 445 conjuncts, 14 conjunts are in the unsatisfiable core [2021-11-21 01:11:15,726 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:11:15,916 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 26 proven. 0 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2021-11-21 01:11:15,916 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-21 01:11:15,916 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1217351996] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 01:11:15,917 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-21 01:11:15,917 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [8] total 9 [2021-11-21 01:11:15,917 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [87007279] [2021-11-21 01:11:15,917 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:11:15,917 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2021-11-21 01:11:15,918 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:11:15,918 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2021-11-21 01:11:15,918 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=19, Invalid=53, Unknown=0, NotChecked=0, Total=72 [2021-11-21 01:11:15,918 INFO L87 Difference]: Start difference. First operand 942 states and 1227 transitions. Second operand has 7 states, 7 states have (on average 7.714285714285714) internal successors, (54), 6 states have internal predecessors, (54), 3 states have call successors, (11), 3 states have call predecessors, (11), 4 states have return successors, (10), 4 states have call predecessors, (10), 3 states have call successors, (10) [2021-11-21 01:11:16,500 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:11:16,500 INFO L93 Difference]: Finished difference Result 1751 states and 2330 transitions. [2021-11-21 01:11:16,500 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2021-11-21 01:11:16,501 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 7.714285714285714) internal successors, (54), 6 states have internal predecessors, (54), 3 states have call successors, (11), 3 states have call predecessors, (11), 4 states have return successors, (10), 4 states have call predecessors, (10), 3 states have call successors, (10) Word has length 80 [2021-11-21 01:11:16,501 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:11:16,508 INFO L225 Difference]: With dead ends: 1751 [2021-11-21 01:11:16,508 INFO L226 Difference]: Without dead ends: 1080 [2021-11-21 01:11:16,510 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 93 GetRequests, 79 SyntacticMatches, 3 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 19 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=43, Invalid=113, Unknown=0, NotChecked=0, Total=156 [2021-11-21 01:11:16,511 INFO L933 BasicCegarLoop]: 368 mSDtfsCounter, 520 mSDsluCounter, 1014 mSDsCounter, 0 mSdLazyCounter, 299 mSolverCounterSat, 178 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 520 SdHoareTripleChecker+Valid, 1336 SdHoareTripleChecker+Invalid, 477 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 178 IncrementalHoareTripleChecker+Valid, 299 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-21 01:11:16,511 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [520 Valid, 1336 Invalid, 477 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [178 Valid, 299 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-21 01:11:16,512 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1080 states. [2021-11-21 01:11:16,633 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1080 to 904. [2021-11-21 01:11:16,635 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 904 states, 654 states have (on average 1.2859327217125383) internal successors, (841), 661 states have internal predecessors, (841), 163 states have call successors, (163), 86 states have call predecessors, (163), 86 states have return successors, (163), 156 states have call predecessors, (163), 163 states have call successors, (163) [2021-11-21 01:11:16,637 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 904 states to 904 states and 1167 transitions. [2021-11-21 01:11:16,638 INFO L78 Accepts]: Start accepts. Automaton has 904 states and 1167 transitions. Word has length 80 [2021-11-21 01:11:16,639 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:11:16,639 INFO L470 AbstractCegarLoop]: Abstraction has 904 states and 1167 transitions. [2021-11-21 01:11:16,639 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 7.714285714285714) internal successors, (54), 6 states have internal predecessors, (54), 3 states have call successors, (11), 3 states have call predecessors, (11), 4 states have return successors, (10), 4 states have call predecessors, (10), 3 states have call successors, (10) [2021-11-21 01:11:16,639 INFO L276 IsEmpty]: Start isEmpty. Operand 904 states and 1167 transitions. [2021-11-21 01:11:16,641 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2021-11-21 01:11:16,641 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:11:16,641 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 3, 3, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:11:16,678 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0537642d-0b8a-4af5-8a6c-b14990b15b9a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2021-11-21 01:11:16,862 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20,11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0537642d-0b8a-4af5-8a6c-b14990b15b9a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:11:16,862 INFO L402 AbstractCegarLoop]: === Iteration 22 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:11:16,862 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:11:16,862 INFO L85 PathProgramCache]: Analyzing trace with hash -1646277717, now seen corresponding path program 1 times [2021-11-21 01:11:16,862 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:11:16,863 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [289989152] [2021-11-21 01:11:16,863 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:11:16,863 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:11:16,936 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:11:17,136 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2021-11-21 01:11:17,137 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:11:17,137 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [289989152] [2021-11-21 01:11:17,137 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [289989152] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:11:17,137 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1339589553] [2021-11-21 01:11:17,137 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:11:17,137 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:11:17,138 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0537642d-0b8a-4af5-8a6c-b14990b15b9a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:11:17,138 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0537642d-0b8a-4af5-8a6c-b14990b15b9a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:11:17,139 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0537642d-0b8a-4af5-8a6c-b14990b15b9a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2021-11-21 01:11:17,233 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:11:17,235 INFO L263 TraceCheckSpWp]: Trace formula consists of 445 conjuncts, 17 conjunts are in the unsatisfiable core [2021-11-21 01:11:17,237 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:11:17,560 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 5 proven. 1 refuted. 0 times theorem prover too weak. 27 trivial. 0 not checked. [2021-11-21 01:11:17,560 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:11:17,863 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2021-11-21 01:11:17,864 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1339589553] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:11:17,864 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1309478078] [2021-11-21 01:11:17,866 INFO L159 IcfgInterpreter]: Started Sifa with 61 locations of interest [2021-11-21 01:11:17,866 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:11:17,867 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:11:17,867 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:11:17,867 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:12:29,381 INFO L197 IcfgInterpreter]: Interpreting procedure read_active_side_history with input of size 106 for LOIs [2021-11-21 01:12:30,210 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 98 for LOIs [2021-11-21 01:12:30,521 INFO L197 IcfgInterpreter]: Interpreting procedure read_side1_failed_history with input of size 120 for LOIs [2021-11-21 01:12:32,196 INFO L197 IcfgInterpreter]: Interpreting procedure assert with input of size 121 for LOIs [2021-11-21 01:12:33,800 INFO L197 IcfgInterpreter]: Interpreting procedure read_side2_failed_history with input of size 117 for LOIs [2021-11-21 01:12:35,708 INFO L197 IcfgInterpreter]: Interpreting procedure read_manual_selection_history with input of size 112 for LOIs [2021-11-21 01:12:37,379 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:13:14,350 WARN L312 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2021-11-21 01:13:14,350 INFO L186 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:13:14,350 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 9, 9] total 20 [2021-11-21 01:13:14,350 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1776217462] [2021-11-21 01:13:14,350 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2021-11-21 01:13:14,351 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2021-11-21 01:13:14,351 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:13:14,351 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2021-11-21 01:13:14,353 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=479, Invalid=3943, Unknown=0, NotChecked=0, Total=4422 [2021-11-21 01:13:14,353 INFO L87 Difference]: Start difference. First operand 904 states and 1167 transitions. Second operand has 20 states, 15 states have (on average 5.733333333333333) internal successors, (86), 18 states have internal predecessors, (86), 6 states have call successors, (26), 3 states have call predecessors, (26), 9 states have return successors, (26), 7 states have call predecessors, (26), 6 states have call successors, (26) [2021-11-21 01:13:15,446 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:13:15,447 INFO L93 Difference]: Finished difference Result 2207 states and 3039 transitions. [2021-11-21 01:13:15,448 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 18 states. [2021-11-21 01:13:15,448 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 15 states have (on average 5.733333333333333) internal successors, (86), 18 states have internal predecessors, (86), 6 states have call successors, (26), 3 states have call predecessors, (26), 9 states have return successors, (26), 7 states have call predecessors, (26), 6 states have call successors, (26) Word has length 80 [2021-11-21 01:13:15,448 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:13:15,457 INFO L225 Difference]: With dead ends: 2207 [2021-11-21 01:13:15,457 INFO L226 Difference]: Without dead ends: 1466 [2021-11-21 01:13:15,462 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 259 GetRequests, 178 SyntacticMatches, 9 SemanticMatches, 72 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1601 ImplicationChecksByTransitivity, 37.4s TimeCoverageRelationStatistics Valid=537, Invalid=4865, Unknown=0, NotChecked=0, Total=5402 [2021-11-21 01:13:15,462 INFO L933 BasicCegarLoop]: 352 mSDtfsCounter, 394 mSDsluCounter, 4120 mSDsCounter, 0 mSdLazyCounter, 884 mSolverCounterSat, 86 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 430 SdHoareTripleChecker+Valid, 4296 SdHoareTripleChecker+Invalid, 970 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 86 IncrementalHoareTripleChecker+Valid, 884 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2021-11-21 01:13:15,463 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [430 Valid, 4296 Invalid, 970 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [86 Valid, 884 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2021-11-21 01:13:15,465 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1466 states. [2021-11-21 01:13:15,615 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1466 to 883. [2021-11-21 01:13:15,617 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 883 states, 639 states have (on average 1.2785602503912363) internal successors, (817), 646 states have internal predecessors, (817), 157 states have call successors, (157), 86 states have call predecessors, (157), 86 states have return successors, (157), 150 states have call predecessors, (157), 157 states have call successors, (157) [2021-11-21 01:13:15,620 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 883 states to 883 states and 1131 transitions. [2021-11-21 01:13:15,621 INFO L78 Accepts]: Start accepts. Automaton has 883 states and 1131 transitions. Word has length 80 [2021-11-21 01:13:15,621 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:13:15,622 INFO L470 AbstractCegarLoop]: Abstraction has 883 states and 1131 transitions. [2021-11-21 01:13:15,622 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 15 states have (on average 5.733333333333333) internal successors, (86), 18 states have internal predecessors, (86), 6 states have call successors, (26), 3 states have call predecessors, (26), 9 states have return successors, (26), 7 states have call predecessors, (26), 6 states have call successors, (26) [2021-11-21 01:13:15,622 INFO L276 IsEmpty]: Start isEmpty. Operand 883 states and 1131 transitions. [2021-11-21 01:13:15,624 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 83 [2021-11-21 01:13:15,624 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:13:15,624 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:13:15,664 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0537642d-0b8a-4af5-8a6c-b14990b15b9a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2021-11-21 01:13:15,848 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0537642d-0b8a-4af5-8a6c-b14990b15b9a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable21 [2021-11-21 01:13:15,849 INFO L402 AbstractCegarLoop]: === Iteration 23 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:13:15,849 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:13:15,849 INFO L85 PathProgramCache]: Analyzing trace with hash 524584204, now seen corresponding path program 1 times [2021-11-21 01:13:15,849 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:13:15,849 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [559390268] [2021-11-21 01:13:15,849 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:13:15,850 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:13:15,885 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:13:16,010 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2021-11-21 01:13:16,010 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:13:16,011 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [559390268] [2021-11-21 01:13:16,011 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [559390268] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:13:16,011 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [208878115] [2021-11-21 01:13:16,011 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:13:16,011 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:13:16,011 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0537642d-0b8a-4af5-8a6c-b14990b15b9a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:13:16,013 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0537642d-0b8a-4af5-8a6c-b14990b15b9a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:13:16,032 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0537642d-0b8a-4af5-8a6c-b14990b15b9a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2021-11-21 01:13:16,133 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:13:16,135 INFO L263 TraceCheckSpWp]: Trace formula consists of 465 conjuncts, 16 conjunts are in the unsatisfiable core [2021-11-21 01:13:16,137 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:13:16,316 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 18 proven. 2 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2021-11-21 01:13:16,316 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:13:16,510 INFO L134 CoverageAnalysis]: Checked inductivity of 24 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-11-21 01:13:16,511 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [208878115] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:13:16,511 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2071875693] [2021-11-21 01:13:16,512 INFO L159 IcfgInterpreter]: Started Sifa with 63 locations of interest [2021-11-21 01:13:16,512 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:13:16,513 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:13:16,513 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:13:16,513 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2021-11-21 01:13:51,089 INFO L197 IcfgInterpreter]: Interpreting procedure read_active_side_history with input of size 149 for LOIs [2021-11-21 01:13:52,444 INFO L197 IcfgInterpreter]: Interpreting procedure assume_abort_if_not with input of size 98 for LOIs [2021-11-21 01:13:52,655 INFO L197 IcfgInterpreter]: Interpreting procedure read_side1_failed_history with input of size 93 for LOIs [2021-11-21 01:13:54,382 INFO L197 IcfgInterpreter]: Interpreting procedure read_side2_failed_history with input of size 99 for LOIs [2021-11-21 01:13:55,746 INFO L197 IcfgInterpreter]: Interpreting procedure read_manual_selection_history with input of size 91 for LOIs [2021-11-21 01:13:56,541 INFO L180 IcfgInterpreter]: Interpretation finished [2021-11-21 01:14:12,720 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSifa [2071875693] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-21 01:14:12,720 INFO L186 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2021-11-21 01:14:12,721 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [43] imperfect sequences [8, 9, 9] total 55 [2021-11-21 01:14:12,722 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [660366905] [2021-11-21 01:14:12,722 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-21 01:14:12,722 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 44 states [2021-11-21 01:14:12,723 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-21 01:14:12,723 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2021-11-21 01:14:12,724 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=312, Invalid=2658, Unknown=0, NotChecked=0, Total=2970 [2021-11-21 01:14:12,724 INFO L87 Difference]: Start difference. First operand 883 states and 1131 transitions. Second operand has 44 states, 37 states have (on average 1.2702702702702702) internal successors, (47), 30 states have internal predecessors, (47), 9 states have call successors, (11), 6 states have call predecessors, (11), 5 states have return successors, (10), 9 states have call predecessors, (10), 9 states have call successors, (10) [2021-11-21 01:14:29,325 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-21 01:14:29,325 INFO L93 Difference]: Finished difference Result 1492 states and 1941 transitions. [2021-11-21 01:14:29,326 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 44 states. [2021-11-21 01:14:29,326 INFO L78 Accepts]: Start accepts. Automaton has has 44 states, 37 states have (on average 1.2702702702702702) internal successors, (47), 30 states have internal predecessors, (47), 9 states have call successors, (11), 6 states have call predecessors, (11), 5 states have return successors, (10), 9 states have call predecessors, (10), 9 states have call successors, (10) Word has length 82 [2021-11-21 01:14:29,326 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-21 01:14:29,331 INFO L225 Difference]: With dead ends: 1492 [2021-11-21 01:14:29,331 INFO L226 Difference]: Without dead ends: 918 [2021-11-21 01:14:29,334 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 271 GetRequests, 193 SyntacticMatches, 9 SemanticMatches, 69 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1279 ImplicationChecksByTransitivity, 26.7s TimeCoverageRelationStatistics Valid=550, Invalid=4420, Unknown=0, NotChecked=0, Total=4970 [2021-11-21 01:14:29,334 INFO L933 BasicCegarLoop]: 287 mSDtfsCounter, 259 mSDsluCounter, 4923 mSDsCounter, 0 mSdLazyCounter, 3878 mSolverCounterSat, 129 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 5.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 262 SdHoareTripleChecker+Valid, 5185 SdHoareTripleChecker+Invalid, 4007 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 129 IncrementalHoareTripleChecker+Valid, 3878 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 6.1s IncrementalHoareTripleChecker+Time [2021-11-21 01:14:29,335 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [262 Valid, 5185 Invalid, 4007 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [129 Valid, 3878 Invalid, 0 Unknown, 0 Unchecked, 6.1s Time] [2021-11-21 01:14:29,336 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 918 states. [2021-11-21 01:14:29,447 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 918 to 886. [2021-11-21 01:14:29,449 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 886 states, 641 states have (on average 1.2776911076443058) internal successors, (819), 648 states have internal predecessors, (819), 158 states have call successors, (158), 86 states have call predecessors, (158), 86 states have return successors, (158), 151 states have call predecessors, (158), 158 states have call successors, (158) [2021-11-21 01:14:29,452 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 886 states to 886 states and 1135 transitions. [2021-11-21 01:14:29,452 INFO L78 Accepts]: Start accepts. Automaton has 886 states and 1135 transitions. Word has length 82 [2021-11-21 01:14:29,453 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-21 01:14:29,453 INFO L470 AbstractCegarLoop]: Abstraction has 886 states and 1135 transitions. [2021-11-21 01:14:29,453 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 44 states, 37 states have (on average 1.2702702702702702) internal successors, (47), 30 states have internal predecessors, (47), 9 states have call successors, (11), 6 states have call predecessors, (11), 5 states have return successors, (10), 9 states have call predecessors, (10), 9 states have call successors, (10) [2021-11-21 01:14:29,453 INFO L276 IsEmpty]: Start isEmpty. Operand 886 states and 1135 transitions. [2021-11-21 01:14:29,455 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 88 [2021-11-21 01:14:29,455 INFO L506 BasicCegarLoop]: Found error trace [2021-11-21 01:14:29,455 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-21 01:14:29,493 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0537642d-0b8a-4af5-8a6c-b14990b15b9a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2021-11-21 01:14:29,670 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0537642d-0b8a-4af5-8a6c-b14990b15b9a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable22 [2021-11-21 01:14:29,670 INFO L402 AbstractCegarLoop]: === Iteration 24 === Targeting assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-21 01:14:29,670 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-21 01:14:29,670 INFO L85 PathProgramCache]: Analyzing trace with hash -598694628, now seen corresponding path program 1 times [2021-11-21 01:14:29,670 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-21 01:14:29,670 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1817615132] [2021-11-21 01:14:29,671 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:14:29,671 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-21 01:14:29,696 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:14:29,802 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-11-21 01:14:29,802 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-21 01:14:29,803 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1817615132] [2021-11-21 01:14:29,803 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1817615132] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-21 01:14:29,803 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [209599234] [2021-11-21 01:14:29,803 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-21 01:14:29,804 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-21 01:14:29,804 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0537642d-0b8a-4af5-8a6c-b14990b15b9a/bin/utaipan-TEXQjIfE4P/z3 [2021-11-21 01:14:29,810 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0537642d-0b8a-4af5-8a6c-b14990b15b9a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-21 01:14:29,833 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0537642d-0b8a-4af5-8a6c-b14990b15b9a/bin/utaipan-TEXQjIfE4P/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2021-11-21 01:14:29,932 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-21 01:14:29,934 INFO L263 TraceCheckSpWp]: Trace formula consists of 462 conjuncts, 16 conjunts are in the unsatisfiable core [2021-11-21 01:14:29,936 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-21 01:14:30,164 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 22 proven. 2 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2021-11-21 01:14:30,164 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-21 01:14:30,418 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2021-11-21 01:14:30,418 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [209599234] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-21 01:14:30,418 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1375665395] [2021-11-21 01:14:30,420 INFO L159 IcfgInterpreter]: Started Sifa with 64 locations of interest [2021-11-21 01:14:30,420 INFO L166 IcfgInterpreter]: Building call graph [2021-11-21 01:14:30,422 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-21 01:14:30,422 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-21 01:14:30,422 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs