./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/seq-mthreaded-reduced/pals_opt-floodmax.4.1.ufo.BOUNDED-8.pals.c.v+cfa-reducer.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 47ea0209 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf028e26-a3cb-4fbe-9adf-0acde14a0be5/bin/utaipan-UUZaoUuFF8/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf028e26-a3cb-4fbe-9adf-0acde14a0be5/bin/utaipan-UUZaoUuFF8/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf028e26-a3cb-4fbe-9adf-0acde14a0be5/bin/utaipan-UUZaoUuFF8/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf028e26-a3cb-4fbe-9adf-0acde14a0be5/bin/utaipan-UUZaoUuFF8/config/TaipanReach.xml -i ../../sv-benchmarks/c/seq-mthreaded-reduced/pals_opt-floodmax.4.1.ufo.BOUNDED-8.pals.c.v+cfa-reducer.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf028e26-a3cb-4fbe-9adf-0acde14a0be5/bin/utaipan-UUZaoUuFF8/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf028e26-a3cb-4fbe-9adf-0acde14a0be5/bin/utaipan-UUZaoUuFF8 --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 0e4a14a6af4061d17c8fde5475e0f3a38fede87663f764ff2ccff752f7727295 --- Real Ultimate output --- This is Ultimate 0.2.1-dev-47ea020 [2021-11-07 01:42:01,236 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-07 01:42:01,238 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-07 01:42:01,276 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-07 01:42:01,277 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-07 01:42:01,278 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-07 01:42:01,280 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-07 01:42:01,282 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-07 01:42:01,285 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-07 01:42:01,286 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-07 01:42:01,287 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-07 01:42:01,289 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-07 01:42:01,290 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-07 01:42:01,291 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-07 01:42:01,293 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-07 01:42:01,295 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-07 01:42:01,296 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-07 01:42:01,298 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-07 01:42:01,300 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-07 01:42:01,303 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-07 01:42:01,305 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-07 01:42:01,307 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-07 01:42:01,308 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-07 01:42:01,310 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-07 01:42:01,314 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-07 01:42:01,314 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-07 01:42:01,315 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-07 01:42:01,316 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-07 01:42:01,317 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-07 01:42:01,318 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-07 01:42:01,319 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-07 01:42:01,320 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-07 01:42:01,321 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-07 01:42:01,326 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-07 01:42:01,327 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-07 01:42:01,328 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-07 01:42:01,329 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-07 01:42:01,329 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-07 01:42:01,329 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-07 01:42:01,331 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-07 01:42:01,331 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-07 01:42:01,334 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf028e26-a3cb-4fbe-9adf-0acde14a0be5/bin/utaipan-UUZaoUuFF8/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-07 01:42:01,385 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-07 01:42:01,385 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-07 01:42:01,386 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-07 01:42:01,387 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-07 01:42:01,387 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-07 01:42:01,387 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-07 01:42:01,388 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-07 01:42:01,388 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-07 01:42:01,394 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-07 01:42:01,395 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-07 01:42:01,396 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-07 01:42:01,396 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-07 01:42:01,396 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-07 01:42:01,397 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-07 01:42:01,397 INFO L138 SettingsManager]: * Simplification Technique=SIMPLIFY_QUICK [2021-11-07 01:42:01,398 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-07 01:42:01,398 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-07 01:42:01,398 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-07 01:42:01,398 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-07 01:42:01,399 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-07 01:42:01,399 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-07 01:42:01,399 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-07 01:42:01,399 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-07 01:42:01,399 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-11-07 01:42:01,400 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-07 01:42:01,400 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-07 01:42:01,400 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-07 01:42:01,400 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-07 01:42:01,401 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-07 01:42:01,402 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-07 01:42:01,403 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-07 01:42:01,403 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-07 01:42:01,403 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-07 01:42:01,403 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-07 01:42:01,404 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-07 01:42:01,404 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-07 01:42:01,404 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-07 01:42:01,404 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-07 01:42:01,405 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-07 01:42:01,405 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_bf028e26-a3cb-4fbe-9adf-0acde14a0be5/bin/utaipan-UUZaoUuFF8/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf028e26-a3cb-4fbe-9adf-0acde14a0be5/bin/utaipan-UUZaoUuFF8 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 0e4a14a6af4061d17c8fde5475e0f3a38fede87663f764ff2ccff752f7727295 [2021-11-07 01:42:01,660 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-07 01:42:01,691 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-07 01:42:01,694 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-07 01:42:01,696 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-07 01:42:01,697 INFO L275 PluginConnector]: CDTParser initialized [2021-11-07 01:42:01,698 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf028e26-a3cb-4fbe-9adf-0acde14a0be5/bin/utaipan-UUZaoUuFF8/../../sv-benchmarks/c/seq-mthreaded-reduced/pals_opt-floodmax.4.1.ufo.BOUNDED-8.pals.c.v+cfa-reducer.c [2021-11-07 01:42:01,817 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf028e26-a3cb-4fbe-9adf-0acde14a0be5/bin/utaipan-UUZaoUuFF8/data/ca8a180f0/4cacbab2667b451cb0857ea91bee0d9d/FLAG980699924 [2021-11-07 01:42:02,460 INFO L306 CDTParser]: Found 1 translation units. [2021-11-07 01:42:02,460 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf028e26-a3cb-4fbe-9adf-0acde14a0be5/sv-benchmarks/c/seq-mthreaded-reduced/pals_opt-floodmax.4.1.ufo.BOUNDED-8.pals.c.v+cfa-reducer.c [2021-11-07 01:42:02,479 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf028e26-a3cb-4fbe-9adf-0acde14a0be5/bin/utaipan-UUZaoUuFF8/data/ca8a180f0/4cacbab2667b451cb0857ea91bee0d9d/FLAG980699924 [2021-11-07 01:42:02,703 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf028e26-a3cb-4fbe-9adf-0acde14a0be5/bin/utaipan-UUZaoUuFF8/data/ca8a180f0/4cacbab2667b451cb0857ea91bee0d9d [2021-11-07 01:42:02,705 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-07 01:42:02,706 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-07 01:42:02,714 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-07 01:42:02,715 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-07 01:42:02,718 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-07 01:42:02,719 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 01:42:02" (1/1) ... [2021-11-07 01:42:02,720 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3fa69786 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:42:02, skipping insertion in model container [2021-11-07 01:42:02,721 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 07.11 01:42:02" (1/1) ... [2021-11-07 01:42:02,728 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-07 01:42:02,791 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-07 01:42:03,084 WARN L228 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_bf028e26-a3cb-4fbe-9adf-0acde14a0be5/sv-benchmarks/c/seq-mthreaded-reduced/pals_opt-floodmax.4.1.ufo.BOUNDED-8.pals.c.v+cfa-reducer.c[13338,13351] [2021-11-07 01:42:03,190 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-07 01:42:03,207 INFO L203 MainTranslator]: Completed pre-run [2021-11-07 01:42:03,318 WARN L228 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_bf028e26-a3cb-4fbe-9adf-0acde14a0be5/sv-benchmarks/c/seq-mthreaded-reduced/pals_opt-floodmax.4.1.ufo.BOUNDED-8.pals.c.v+cfa-reducer.c[13338,13351] [2021-11-07 01:42:03,368 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-07 01:42:03,389 INFO L208 MainTranslator]: Completed translation [2021-11-07 01:42:03,390 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:42:03 WrapperNode [2021-11-07 01:42:03,390 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-07 01:42:03,391 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-07 01:42:03,391 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-07 01:42:03,392 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-07 01:42:03,400 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:42:03" (1/1) ... [2021-11-07 01:42:03,430 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:42:03" (1/1) ... [2021-11-07 01:42:03,517 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-07 01:42:03,518 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-07 01:42:03,518 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-07 01:42:03,519 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-07 01:42:03,526 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:42:03" (1/1) ... [2021-11-07 01:42:03,526 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:42:03" (1/1) ... [2021-11-07 01:42:03,533 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:42:03" (1/1) ... [2021-11-07 01:42:03,533 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:42:03" (1/1) ... [2021-11-07 01:42:03,554 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:42:03" (1/1) ... [2021-11-07 01:42:03,568 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:42:03" (1/1) ... [2021-11-07 01:42:03,574 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:42:03" (1/1) ... [2021-11-07 01:42:03,582 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-07 01:42:03,583 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-07 01:42:03,583 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-07 01:42:03,583 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-07 01:42:03,584 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:42:03" (1/1) ... [2021-11-07 01:42:03,592 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-07 01:42:03,605 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf028e26-a3cb-4fbe-9adf-0acde14a0be5/bin/utaipan-UUZaoUuFF8/z3 [2021-11-07 01:42:03,619 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf028e26-a3cb-4fbe-9adf-0acde14a0be5/bin/utaipan-UUZaoUuFF8/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-07 01:42:03,653 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf028e26-a3cb-4fbe-9adf-0acde14a0be5/bin/utaipan-UUZaoUuFF8/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-07 01:42:03,701 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-07 01:42:03,701 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-11-07 01:42:03,701 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-07 01:42:03,702 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-07 01:42:06,194 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-07 01:42:06,196 INFO L299 CfgBuilder]: Removed 4 assume(true) statements. [2021-11-07 01:42:06,201 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 01:42:06 BoogieIcfgContainer [2021-11-07 01:42:06,203 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-07 01:42:06,205 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-07 01:42:06,206 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-07 01:42:06,209 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-07 01:42:06,210 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 07.11 01:42:02" (1/3) ... [2021-11-07 01:42:06,211 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@432da4bd and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.11 01:42:06, skipping insertion in model container [2021-11-07 01:42:06,212 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 07.11 01:42:03" (2/3) ... [2021-11-07 01:42:06,212 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@432da4bd and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 07.11 01:42:06, skipping insertion in model container [2021-11-07 01:42:06,212 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 07.11 01:42:06" (3/3) ... [2021-11-07 01:42:06,214 INFO L111 eAbstractionObserver]: Analyzing ICFG pals_opt-floodmax.4.1.ufo.BOUNDED-8.pals.c.v+cfa-reducer.c [2021-11-07 01:42:06,221 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-07 01:42:06,222 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-07 01:42:06,298 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-07 01:42:06,307 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 [2021-11-07 01:42:06,308 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-07 01:42:06,340 INFO L276 IsEmpty]: Start isEmpty. Operand has 263 states, 261 states have (on average 1.6781609195402298) internal successors, (438), 262 states have internal predecessors, (438), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:42:06,355 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 98 [2021-11-07 01:42:06,355 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:42:06,356 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 01:42:06,356 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:42:06,362 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:42:06,363 INFO L85 PathProgramCache]: Analyzing trace with hash -1090069601, now seen corresponding path program 1 times [2021-11-07 01:42:06,374 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 01:42:06,374 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [843875451] [2021-11-07 01:42:06,374 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:42:06,375 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 01:42:06,657 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:42:06,930 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:42:06,930 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 01:42:06,931 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [843875451] [2021-11-07 01:42:06,931 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [843875451] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 01:42:06,932 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 01:42:06,932 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-07 01:42:06,934 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1528149673] [2021-11-07 01:42:06,940 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-07 01:42:06,940 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 01:42:06,955 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-07 01:42:06,956 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 01:42:06,961 INFO L87 Difference]: Start difference. First operand has 263 states, 261 states have (on average 1.6781609195402298) internal successors, (438), 262 states have internal predecessors, (438), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 3 states, 3 states have (on average 32.333333333333336) internal successors, (97), 3 states have internal predecessors, (97), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:42:07,068 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:42:07,068 INFO L93 Difference]: Finished difference Result 457 states and 755 transitions. [2021-11-07 01:42:07,069 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-07 01:42:07,070 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 32.333333333333336) internal successors, (97), 3 states have internal predecessors, (97), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 97 [2021-11-07 01:42:07,071 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:42:07,085 INFO L225 Difference]: With dead ends: 457 [2021-11-07 01:42:07,086 INFO L226 Difference]: Without dead ends: 346 [2021-11-07 01:42:07,089 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 01:42:07,105 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 346 states. [2021-11-07 01:42:07,157 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 346 to 344. [2021-11-07 01:42:07,160 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 344 states, 343 states have (on average 1.565597667638484) internal successors, (537), 343 states have internal predecessors, (537), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:42:07,164 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 344 states to 344 states and 537 transitions. [2021-11-07 01:42:07,165 INFO L78 Accepts]: Start accepts. Automaton has 344 states and 537 transitions. Word has length 97 [2021-11-07 01:42:07,166 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:42:07,166 INFO L470 AbstractCegarLoop]: Abstraction has 344 states and 537 transitions. [2021-11-07 01:42:07,166 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 32.333333333333336) internal successors, (97), 3 states have internal predecessors, (97), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:42:07,167 INFO L276 IsEmpty]: Start isEmpty. Operand 344 states and 537 transitions. [2021-11-07 01:42:07,172 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 100 [2021-11-07 01:42:07,172 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:42:07,172 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 01:42:07,172 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-07 01:42:07,173 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:42:07,173 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:42:07,174 INFO L85 PathProgramCache]: Analyzing trace with hash 1674285279, now seen corresponding path program 1 times [2021-11-07 01:42:07,174 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 01:42:07,174 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [171501825] [2021-11-07 01:42:07,174 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:42:07,174 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 01:42:07,233 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:42:07,328 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:42:07,328 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 01:42:07,328 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [171501825] [2021-11-07 01:42:07,328 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [171501825] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 01:42:07,329 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 01:42:07,329 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-07 01:42:07,329 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1923153716] [2021-11-07 01:42:07,330 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-07 01:42:07,331 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 01:42:07,331 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-07 01:42:07,331 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 01:42:07,332 INFO L87 Difference]: Start difference. First operand 344 states and 537 transitions. Second operand has 3 states, 3 states have (on average 33.0) internal successors, (99), 3 states have internal predecessors, (99), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:42:07,384 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:42:07,384 INFO L93 Difference]: Finished difference Result 638 states and 1018 transitions. [2021-11-07 01:42:07,385 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-07 01:42:07,385 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 33.0) internal successors, (99), 3 states have internal predecessors, (99), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 99 [2021-11-07 01:42:07,386 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:42:07,390 INFO L225 Difference]: With dead ends: 638 [2021-11-07 01:42:07,390 INFO L226 Difference]: Without dead ends: 450 [2021-11-07 01:42:07,392 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 01:42:07,393 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 450 states. [2021-11-07 01:42:07,420 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 450 to 448. [2021-11-07 01:42:07,421 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 448 states, 447 states have (on average 1.574944071588367) internal successors, (704), 447 states have internal predecessors, (704), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:42:07,423 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 448 states to 448 states and 704 transitions. [2021-11-07 01:42:07,424 INFO L78 Accepts]: Start accepts. Automaton has 448 states and 704 transitions. Word has length 99 [2021-11-07 01:42:07,424 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:42:07,425 INFO L470 AbstractCegarLoop]: Abstraction has 448 states and 704 transitions. [2021-11-07 01:42:07,425 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 33.0) internal successors, (99), 3 states have internal predecessors, (99), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:42:07,425 INFO L276 IsEmpty]: Start isEmpty. Operand 448 states and 704 transitions. [2021-11-07 01:42:07,428 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 103 [2021-11-07 01:42:07,428 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:42:07,429 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 01:42:07,429 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-11-07 01:42:07,430 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:42:07,431 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:42:07,431 INFO L85 PathProgramCache]: Analyzing trace with hash -142297425, now seen corresponding path program 1 times [2021-11-07 01:42:07,431 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 01:42:07,432 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2073730744] [2021-11-07 01:42:07,432 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:42:07,432 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 01:42:07,514 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:42:07,617 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:42:07,621 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 01:42:07,621 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2073730744] [2021-11-07 01:42:07,621 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2073730744] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 01:42:07,622 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 01:42:07,623 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-07 01:42:07,624 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1774517033] [2021-11-07 01:42:07,625 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-07 01:42:07,627 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 01:42:07,628 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-07 01:42:07,632 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 01:42:07,633 INFO L87 Difference]: Start difference. First operand 448 states and 704 transitions. Second operand has 3 states, 3 states have (on average 34.0) internal successors, (102), 3 states have internal predecessors, (102), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:42:07,686 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:42:07,686 INFO L93 Difference]: Finished difference Result 968 states and 1553 transitions. [2021-11-07 01:42:07,687 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-07 01:42:07,687 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 34.0) internal successors, (102), 3 states have internal predecessors, (102), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 102 [2021-11-07 01:42:07,691 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:42:07,696 INFO L225 Difference]: With dead ends: 968 [2021-11-07 01:42:07,697 INFO L226 Difference]: Without dead ends: 678 [2021-11-07 01:42:07,702 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 01:42:07,704 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 678 states. [2021-11-07 01:42:07,741 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 678 to 676. [2021-11-07 01:42:07,743 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 676 states, 675 states have (on average 1.5925925925925926) internal successors, (1075), 675 states have internal predecessors, (1075), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:42:07,779 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 676 states to 676 states and 1075 transitions. [2021-11-07 01:42:07,780 INFO L78 Accepts]: Start accepts. Automaton has 676 states and 1075 transitions. Word has length 102 [2021-11-07 01:42:07,780 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:42:07,780 INFO L470 AbstractCegarLoop]: Abstraction has 676 states and 1075 transitions. [2021-11-07 01:42:07,781 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 34.0) internal successors, (102), 3 states have internal predecessors, (102), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:42:07,781 INFO L276 IsEmpty]: Start isEmpty. Operand 676 states and 1075 transitions. [2021-11-07 01:42:07,785 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 105 [2021-11-07 01:42:07,786 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:42:07,786 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 01:42:07,786 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-11-07 01:42:07,787 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:42:07,787 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:42:07,787 INFO L85 PathProgramCache]: Analyzing trace with hash -279143710, now seen corresponding path program 1 times [2021-11-07 01:42:07,787 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 01:42:07,788 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1119345508] [2021-11-07 01:42:07,788 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:42:07,788 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 01:42:07,836 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:42:07,909 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:42:07,909 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 01:42:07,909 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1119345508] [2021-11-07 01:42:07,914 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1119345508] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 01:42:07,915 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 01:42:07,915 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-07 01:42:07,915 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2646117] [2021-11-07 01:42:07,915 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-07 01:42:07,916 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 01:42:07,917 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-07 01:42:07,917 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 01:42:07,918 INFO L87 Difference]: Start difference. First operand 676 states and 1075 transitions. Second operand has 3 states, 3 states have (on average 34.666666666666664) internal successors, (104), 3 states have internal predecessors, (104), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:42:07,972 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:42:07,972 INFO L93 Difference]: Finished difference Result 1506 states and 2428 transitions. [2021-11-07 01:42:07,972 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-07 01:42:07,972 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 34.666666666666664) internal successors, (104), 3 states have internal predecessors, (104), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 104 [2021-11-07 01:42:07,973 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:42:07,979 INFO L225 Difference]: With dead ends: 1506 [2021-11-07 01:42:07,980 INFO L226 Difference]: Without dead ends: 988 [2021-11-07 01:42:07,982 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 01:42:07,984 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 988 states. [2021-11-07 01:42:08,026 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 988 to 986. [2021-11-07 01:42:08,029 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 986 states, 985 states have (on average 1.603045685279188) internal successors, (1579), 985 states have internal predecessors, (1579), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:42:08,034 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 986 states to 986 states and 1579 transitions. [2021-11-07 01:42:08,035 INFO L78 Accepts]: Start accepts. Automaton has 986 states and 1579 transitions. Word has length 104 [2021-11-07 01:42:08,036 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:42:08,036 INFO L470 AbstractCegarLoop]: Abstraction has 986 states and 1579 transitions. [2021-11-07 01:42:08,036 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 34.666666666666664) internal successors, (104), 3 states have internal predecessors, (104), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:42:08,036 INFO L276 IsEmpty]: Start isEmpty. Operand 986 states and 1579 transitions. [2021-11-07 01:42:08,038 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 108 [2021-11-07 01:42:08,039 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:42:08,039 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 01:42:08,039 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-11-07 01:42:08,039 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:42:08,040 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:42:08,040 INFO L85 PathProgramCache]: Analyzing trace with hash 1390377617, now seen corresponding path program 1 times [2021-11-07 01:42:08,040 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 01:42:08,041 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [264596717] [2021-11-07 01:42:08,041 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:42:08,041 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 01:42:08,102 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:42:08,173 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:42:08,173 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 01:42:08,173 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [264596717] [2021-11-07 01:42:08,174 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [264596717] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 01:42:08,174 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 01:42:08,174 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-07 01:42:08,175 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1515640638] [2021-11-07 01:42:08,175 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-07 01:42:08,175 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 01:42:08,176 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-07 01:42:08,176 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 01:42:08,176 INFO L87 Difference]: Start difference. First operand 986 states and 1579 transitions. Second operand has 3 states, 3 states have (on average 35.666666666666664) internal successors, (107), 3 states have internal predecessors, (107), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:42:08,284 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:42:08,285 INFO L93 Difference]: Finished difference Result 2418 states and 3912 transitions. [2021-11-07 01:42:08,285 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-07 01:42:08,285 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 35.666666666666664) internal successors, (107), 3 states have internal predecessors, (107), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 107 [2021-11-07 01:42:08,286 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:42:08,299 INFO L225 Difference]: With dead ends: 2418 [2021-11-07 01:42:08,299 INFO L226 Difference]: Without dead ends: 1612 [2021-11-07 01:42:08,301 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 01:42:08,304 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1612 states. [2021-11-07 01:42:08,400 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1612 to 1610. [2021-11-07 01:42:08,405 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1610 states, 1609 states have (on average 1.6078309509011808) internal successors, (2587), 1609 states have internal predecessors, (2587), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:42:08,413 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1610 states to 1610 states and 2587 transitions. [2021-11-07 01:42:08,413 INFO L78 Accepts]: Start accepts. Automaton has 1610 states and 2587 transitions. Word has length 107 [2021-11-07 01:42:08,414 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:42:08,414 INFO L470 AbstractCegarLoop]: Abstraction has 1610 states and 2587 transitions. [2021-11-07 01:42:08,414 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 35.666666666666664) internal successors, (107), 3 states have internal predecessors, (107), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:42:08,415 INFO L276 IsEmpty]: Start isEmpty. Operand 1610 states and 2587 transitions. [2021-11-07 01:42:08,416 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 110 [2021-11-07 01:42:08,416 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:42:08,417 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 01:42:08,417 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-11-07 01:42:08,417 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:42:08,418 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:42:08,418 INFO L85 PathProgramCache]: Analyzing trace with hash 1467977439, now seen corresponding path program 1 times [2021-11-07 01:42:08,418 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 01:42:08,418 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1453976844] [2021-11-07 01:42:08,419 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:42:08,419 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 01:42:08,465 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:42:08,528 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:42:08,531 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 01:42:08,532 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1453976844] [2021-11-07 01:42:08,532 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1453976844] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 01:42:08,532 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 01:42:08,532 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-07 01:42:08,533 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1537933754] [2021-11-07 01:42:08,534 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-07 01:42:08,534 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 01:42:08,534 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-07 01:42:08,541 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 01:42:08,542 INFO L87 Difference]: Start difference. First operand 1610 states and 2587 transitions. Second operand has 3 states, 3 states have (on average 36.333333333333336) internal successors, (109), 3 states have internal predecessors, (109), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:42:08,677 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:42:08,677 INFO L93 Difference]: Finished difference Result 3868 states and 6259 transitions. [2021-11-07 01:42:08,678 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-07 01:42:08,678 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 36.333333333333336) internal successors, (109), 3 states have internal predecessors, (109), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 109 [2021-11-07 01:42:08,678 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:42:08,694 INFO L225 Difference]: With dead ends: 3868 [2021-11-07 01:42:08,694 INFO L226 Difference]: Without dead ends: 2438 [2021-11-07 01:42:08,697 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 01:42:08,700 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2438 states. [2021-11-07 01:42:08,852 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2438 to 2436. [2021-11-07 01:42:08,858 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2436 states, 2435 states have (on average 1.6123203285420944) internal successors, (3926), 2435 states have internal predecessors, (3926), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:42:08,869 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2436 states to 2436 states and 3926 transitions. [2021-11-07 01:42:08,869 INFO L78 Accepts]: Start accepts. Automaton has 2436 states and 3926 transitions. Word has length 109 [2021-11-07 01:42:08,870 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:42:08,870 INFO L470 AbstractCegarLoop]: Abstraction has 2436 states and 3926 transitions. [2021-11-07 01:42:08,870 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 36.333333333333336) internal successors, (109), 3 states have internal predecessors, (109), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:42:08,870 INFO L276 IsEmpty]: Start isEmpty. Operand 2436 states and 3926 transitions. [2021-11-07 01:42:08,872 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 113 [2021-11-07 01:42:08,872 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:42:08,872 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 01:42:08,872 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2021-11-07 01:42:08,873 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:42:08,873 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:42:08,873 INFO L85 PathProgramCache]: Analyzing trace with hash -1663052797, now seen corresponding path program 1 times [2021-11-07 01:42:08,873 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 01:42:08,877 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1598509632] [2021-11-07 01:42:08,877 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:42:08,877 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 01:42:08,910 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:42:08,959 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:42:08,959 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 01:42:08,959 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1598509632] [2021-11-07 01:42:08,959 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1598509632] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 01:42:08,959 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 01:42:08,959 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-07 01:42:08,960 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [943526473] [2021-11-07 01:42:08,960 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-07 01:42:08,960 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 01:42:08,961 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-07 01:42:08,962 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 01:42:08,962 INFO L87 Difference]: Start difference. First operand 2436 states and 3926 transitions. Second operand has 3 states, 3 states have (on average 37.333333333333336) internal successors, (112), 3 states have internal predecessors, (112), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:42:09,183 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:42:09,183 INFO L93 Difference]: Finished difference Result 6364 states and 10291 transitions. [2021-11-07 01:42:09,184 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-07 01:42:09,184 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 37.333333333333336) internal successors, (112), 3 states have internal predecessors, (112), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 112 [2021-11-07 01:42:09,185 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:42:09,211 INFO L225 Difference]: With dead ends: 6364 [2021-11-07 01:42:09,211 INFO L226 Difference]: Without dead ends: 4130 [2021-11-07 01:42:09,218 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 01:42:09,225 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 4130 states. [2021-11-07 01:42:09,475 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 4130 to 4128. [2021-11-07 01:42:09,487 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 4128 states, 4127 states have (on average 1.607705354979404) internal successors, (6635), 4127 states have internal predecessors, (6635), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:42:09,506 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 4128 states to 4128 states and 6635 transitions. [2021-11-07 01:42:09,506 INFO L78 Accepts]: Start accepts. Automaton has 4128 states and 6635 transitions. Word has length 112 [2021-11-07 01:42:09,507 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:42:09,507 INFO L470 AbstractCegarLoop]: Abstraction has 4128 states and 6635 transitions. [2021-11-07 01:42:09,507 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 37.333333333333336) internal successors, (112), 3 states have internal predecessors, (112), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:42:09,507 INFO L276 IsEmpty]: Start isEmpty. Operand 4128 states and 6635 transitions. [2021-11-07 01:42:09,508 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 115 [2021-11-07 01:42:09,509 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:42:09,509 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 01:42:09,509 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2021-11-07 01:42:09,509 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:42:09,509 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:42:09,510 INFO L85 PathProgramCache]: Analyzing trace with hash -332455563, now seen corresponding path program 1 times [2021-11-07 01:42:09,510 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 01:42:09,510 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1565242385] [2021-11-07 01:42:09,510 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:42:09,510 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 01:42:09,535 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:42:09,599 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:42:09,599 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 01:42:09,600 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1565242385] [2021-11-07 01:42:09,600 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1565242385] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 01:42:09,600 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 01:42:09,600 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-07 01:42:09,600 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1121495587] [2021-11-07 01:42:09,601 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-07 01:42:09,601 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 01:42:09,601 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-07 01:42:09,602 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 01:42:09,602 INFO L87 Difference]: Start difference. First operand 4128 states and 6635 transitions. Second operand has 3 states, 3 states have (on average 38.0) internal successors, (114), 3 states have internal predecessors, (114), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:42:09,974 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:42:09,974 INFO L93 Difference]: Finished difference Result 10310 states and 16634 transitions. [2021-11-07 01:42:09,974 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-07 01:42:09,974 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 38.0) internal successors, (114), 3 states have internal predecessors, (114), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 114 [2021-11-07 01:42:09,975 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:42:10,020 INFO L225 Difference]: With dead ends: 10310 [2021-11-07 01:42:10,020 INFO L226 Difference]: Without dead ends: 6384 [2021-11-07 01:42:10,028 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 01:42:10,040 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6384 states. [2021-11-07 01:42:10,455 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6384 to 6382. [2021-11-07 01:42:10,471 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 6382 states, 6381 states have (on average 1.6093088857545839) internal successors, (10269), 6381 states have internal predecessors, (10269), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:42:10,501 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6382 states to 6382 states and 10269 transitions. [2021-11-07 01:42:10,501 INFO L78 Accepts]: Start accepts. Automaton has 6382 states and 10269 transitions. Word has length 114 [2021-11-07 01:42:10,501 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:42:10,501 INFO L470 AbstractCegarLoop]: Abstraction has 6382 states and 10269 transitions. [2021-11-07 01:42:10,502 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 38.0) internal successors, (114), 3 states have internal predecessors, (114), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:42:10,502 INFO L276 IsEmpty]: Start isEmpty. Operand 6382 states and 10269 transitions. [2021-11-07 01:42:10,503 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 118 [2021-11-07 01:42:10,503 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:42:10,503 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 01:42:10,503 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2021-11-07 01:42:10,504 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:42:10,504 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:42:10,504 INFO L85 PathProgramCache]: Analyzing trace with hash 622188600, now seen corresponding path program 1 times [2021-11-07 01:42:10,504 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 01:42:10,505 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1721319594] [2021-11-07 01:42:10,505 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:42:10,505 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 01:42:10,545 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:42:10,623 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:42:10,623 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 01:42:10,624 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1721319594] [2021-11-07 01:42:10,625 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1721319594] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 01:42:10,626 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 01:42:10,629 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-07 01:42:10,630 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [622565895] [2021-11-07 01:42:10,630 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-07 01:42:10,630 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 01:42:10,631 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-07 01:42:10,631 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2021-11-07 01:42:10,631 INFO L87 Difference]: Start difference. First operand 6382 states and 10269 transitions. Second operand has 6 states, 6 states have (on average 19.5) internal successors, (117), 6 states have internal predecessors, (117), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:42:11,669 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:42:11,670 INFO L93 Difference]: Finished difference Result 16006 states and 25762 transitions. [2021-11-07 01:42:11,672 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-07 01:42:11,672 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 19.5) internal successors, (117), 6 states have internal predecessors, (117), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 117 [2021-11-07 01:42:11,673 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:42:11,751 INFO L225 Difference]: With dead ends: 16006 [2021-11-07 01:42:11,752 INFO L226 Difference]: Without dead ends: 9848 [2021-11-07 01:42:11,762 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=40, Invalid=70, Unknown=0, NotChecked=0, Total=110 [2021-11-07 01:42:11,776 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9848 states. [2021-11-07 01:42:12,378 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9848 to 9834. [2021-11-07 01:42:12,410 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 9834 states, 9833 states have (on average 1.6015458151123767) internal successors, (15748), 9833 states have internal predecessors, (15748), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:42:12,462 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9834 states to 9834 states and 15748 transitions. [2021-11-07 01:42:12,463 INFO L78 Accepts]: Start accepts. Automaton has 9834 states and 15748 transitions. Word has length 117 [2021-11-07 01:42:12,463 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:42:12,463 INFO L470 AbstractCegarLoop]: Abstraction has 9834 states and 15748 transitions. [2021-11-07 01:42:12,464 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 19.5) internal successors, (117), 6 states have internal predecessors, (117), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:42:12,465 INFO L276 IsEmpty]: Start isEmpty. Operand 9834 states and 15748 transitions. [2021-11-07 01:42:12,466 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 119 [2021-11-07 01:42:12,466 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:42:12,467 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 01:42:12,467 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2021-11-07 01:42:12,467 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:42:12,467 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:42:12,469 INFO L85 PathProgramCache]: Analyzing trace with hash 2040915368, now seen corresponding path program 1 times [2021-11-07 01:42:12,469 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 01:42:12,471 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [377259767] [2021-11-07 01:42:12,471 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:42:12,472 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 01:42:12,568 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:42:12,618 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:42:12,618 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 01:42:12,618 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [377259767] [2021-11-07 01:42:12,619 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [377259767] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 01:42:12,619 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 01:42:12,619 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-07 01:42:12,619 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [353031473] [2021-11-07 01:42:12,620 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-07 01:42:12,620 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 01:42:12,621 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-07 01:42:12,621 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-07 01:42:12,621 INFO L87 Difference]: Start difference. First operand 9834 states and 15748 transitions. Second operand has 4 states, 4 states have (on average 29.5) internal successors, (118), 4 states have internal predecessors, (118), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:42:13,358 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:42:13,359 INFO L93 Difference]: Finished difference Result 19446 states and 31165 transitions. [2021-11-07 01:42:13,359 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-07 01:42:13,359 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 29.5) internal successors, (118), 4 states have internal predecessors, (118), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 118 [2021-11-07 01:42:13,360 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:42:13,385 INFO L225 Difference]: With dead ends: 19446 [2021-11-07 01:42:13,385 INFO L226 Difference]: Without dead ends: 9836 [2021-11-07 01:42:13,399 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-07 01:42:13,412 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9836 states. [2021-11-07 01:42:13,939 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9836 to 9834. [2021-11-07 01:42:13,954 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 9834 states, 9833 states have (on average 1.5980880707820604) internal successors, (15714), 9833 states have internal predecessors, (15714), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:42:13,978 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9834 states to 9834 states and 15714 transitions. [2021-11-07 01:42:13,979 INFO L78 Accepts]: Start accepts. Automaton has 9834 states and 15714 transitions. Word has length 118 [2021-11-07 01:42:13,979 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:42:13,979 INFO L470 AbstractCegarLoop]: Abstraction has 9834 states and 15714 transitions. [2021-11-07 01:42:13,979 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 29.5) internal successors, (118), 4 states have internal predecessors, (118), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:42:13,984 INFO L276 IsEmpty]: Start isEmpty. Operand 9834 states and 15714 transitions. [2021-11-07 01:42:13,985 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 120 [2021-11-07 01:42:13,986 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:42:13,986 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 01:42:13,986 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2021-11-07 01:42:13,987 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:42:13,987 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:42:13,987 INFO L85 PathProgramCache]: Analyzing trace with hash -1218637057, now seen corresponding path program 1 times [2021-11-07 01:42:13,988 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 01:42:13,988 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [972206575] [2021-11-07 01:42:13,988 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:42:13,989 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 01:42:14,019 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:42:14,075 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:42:14,076 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 01:42:14,076 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [972206575] [2021-11-07 01:42:14,076 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [972206575] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 01:42:14,076 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 01:42:14,077 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-07 01:42:14,077 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [549551924] [2021-11-07 01:42:14,077 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-07 01:42:14,078 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 01:42:14,079 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-07 01:42:14,080 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-07 01:42:14,080 INFO L87 Difference]: Start difference. First operand 9834 states and 15714 transitions. Second operand has 4 states, 4 states have (on average 29.75) internal successors, (119), 4 states have internal predecessors, (119), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:42:14,704 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:42:14,704 INFO L93 Difference]: Finished difference Result 19446 states and 31097 transitions. [2021-11-07 01:42:14,704 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-07 01:42:14,705 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 29.75) internal successors, (119), 4 states have internal predecessors, (119), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 119 [2021-11-07 01:42:14,705 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:42:14,733 INFO L225 Difference]: With dead ends: 19446 [2021-11-07 01:42:14,734 INFO L226 Difference]: Without dead ends: 9836 [2021-11-07 01:42:14,750 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-07 01:42:14,764 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9836 states. [2021-11-07 01:42:15,346 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9836 to 9834. [2021-11-07 01:42:15,366 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 9834 states, 9833 states have (on average 1.594630326451744) internal successors, (15680), 9833 states have internal predecessors, (15680), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:42:15,396 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9834 states to 9834 states and 15680 transitions. [2021-11-07 01:42:15,396 INFO L78 Accepts]: Start accepts. Automaton has 9834 states and 15680 transitions. Word has length 119 [2021-11-07 01:42:15,396 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:42:15,397 INFO L470 AbstractCegarLoop]: Abstraction has 9834 states and 15680 transitions. [2021-11-07 01:42:15,397 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 29.75) internal successors, (119), 4 states have internal predecessors, (119), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:42:15,397 INFO L276 IsEmpty]: Start isEmpty. Operand 9834 states and 15680 transitions. [2021-11-07 01:42:15,399 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 121 [2021-11-07 01:42:15,399 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:42:15,400 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 01:42:15,400 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2021-11-07 01:42:15,400 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:42:15,401 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:42:15,401 INFO L85 PathProgramCache]: Analyzing trace with hash 819010895, now seen corresponding path program 1 times [2021-11-07 01:42:15,401 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 01:42:15,402 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [892800302] [2021-11-07 01:42:15,402 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:42:15,402 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 01:42:15,442 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:42:15,493 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:42:15,494 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 01:42:15,494 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [892800302] [2021-11-07 01:42:15,494 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [892800302] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 01:42:15,494 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 01:42:15,494 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-07 01:42:15,495 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [553950525] [2021-11-07 01:42:15,495 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-07 01:42:15,496 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 01:42:15,496 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-07 01:42:15,496 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-07 01:42:15,497 INFO L87 Difference]: Start difference. First operand 9834 states and 15680 transitions. Second operand has 4 states, 4 states have (on average 30.0) internal successors, (120), 4 states have internal predecessors, (120), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:42:16,236 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:42:16,236 INFO L93 Difference]: Finished difference Result 19446 states and 31029 transitions. [2021-11-07 01:42:16,237 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-07 01:42:16,237 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 30.0) internal successors, (120), 4 states have internal predecessors, (120), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 120 [2021-11-07 01:42:16,238 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:42:16,264 INFO L225 Difference]: With dead ends: 19446 [2021-11-07 01:42:16,264 INFO L226 Difference]: Without dead ends: 9836 [2021-11-07 01:42:16,276 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-07 01:42:16,289 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9836 states. [2021-11-07 01:42:16,669 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9836 to 9834. [2021-11-07 01:42:16,687 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 9834 states, 9833 states have (on average 1.5911725821214278) internal successors, (15646), 9833 states have internal predecessors, (15646), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:42:16,718 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9834 states to 9834 states and 15646 transitions. [2021-11-07 01:42:16,718 INFO L78 Accepts]: Start accepts. Automaton has 9834 states and 15646 transitions. Word has length 120 [2021-11-07 01:42:16,718 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:42:16,719 INFO L470 AbstractCegarLoop]: Abstraction has 9834 states and 15646 transitions. [2021-11-07 01:42:16,719 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 30.0) internal successors, (120), 4 states have internal predecessors, (120), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:42:16,719 INFO L276 IsEmpty]: Start isEmpty. Operand 9834 states and 15646 transitions. [2021-11-07 01:42:16,721 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 122 [2021-11-07 01:42:16,721 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:42:16,722 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 01:42:16,722 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2021-11-07 01:42:16,722 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:42:16,723 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:42:16,723 INFO L85 PathProgramCache]: Analyzing trace with hash -433854010, now seen corresponding path program 1 times [2021-11-07 01:42:16,723 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 01:42:16,723 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [482200717] [2021-11-07 01:42:16,724 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:42:16,724 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 01:42:16,752 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:42:16,799 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:42:16,799 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 01:42:16,802 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [482200717] [2021-11-07 01:42:16,802 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [482200717] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 01:42:16,802 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 01:42:16,802 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-07 01:42:16,803 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1001249745] [2021-11-07 01:42:16,803 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-07 01:42:16,803 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 01:42:16,804 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-07 01:42:16,804 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-07 01:42:16,805 INFO L87 Difference]: Start difference. First operand 9834 states and 15646 transitions. Second operand has 4 states, 4 states have (on average 30.25) internal successors, (121), 4 states have internal predecessors, (121), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:42:17,266 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:42:17,266 INFO L93 Difference]: Finished difference Result 19446 states and 30961 transitions. [2021-11-07 01:42:17,267 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-07 01:42:17,267 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 30.25) internal successors, (121), 4 states have internal predecessors, (121), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 121 [2021-11-07 01:42:17,267 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:42:17,291 INFO L225 Difference]: With dead ends: 19446 [2021-11-07 01:42:17,292 INFO L226 Difference]: Without dead ends: 9836 [2021-11-07 01:42:17,307 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 5 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2021-11-07 01:42:17,323 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9836 states. [2021-11-07 01:42:17,742 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9836 to 9834. [2021-11-07 01:42:17,756 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 9834 states, 9833 states have (on average 1.5877148377911117) internal successors, (15612), 9833 states have internal predecessors, (15612), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:42:17,787 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9834 states to 9834 states and 15612 transitions. [2021-11-07 01:42:17,787 INFO L78 Accepts]: Start accepts. Automaton has 9834 states and 15612 transitions. Word has length 121 [2021-11-07 01:42:17,788 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:42:17,788 INFO L470 AbstractCegarLoop]: Abstraction has 9834 states and 15612 transitions. [2021-11-07 01:42:17,788 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 30.25) internal successors, (121), 4 states have internal predecessors, (121), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:42:17,788 INFO L276 IsEmpty]: Start isEmpty. Operand 9834 states and 15612 transitions. [2021-11-07 01:42:17,790 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 124 [2021-11-07 01:42:17,790 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:42:17,791 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 01:42:17,791 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2021-11-07 01:42:17,791 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:42:17,792 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:42:17,792 INFO L85 PathProgramCache]: Analyzing trace with hash -1839181961, now seen corresponding path program 1 times [2021-11-07 01:42:17,792 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 01:42:17,792 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1216706977] [2021-11-07 01:42:17,793 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:42:17,793 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 01:42:17,821 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:42:17,968 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:42:17,968 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 01:42:17,968 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1216706977] [2021-11-07 01:42:17,968 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1216706977] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 01:42:17,969 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 01:42:17,969 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-07 01:42:17,969 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [203358918] [2021-11-07 01:42:17,970 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-07 01:42:17,970 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 01:42:17,971 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-07 01:42:17,971 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-11-07 01:42:17,971 INFO L87 Difference]: Start difference. First operand 9834 states and 15612 transitions. Second operand has 6 states, 6 states have (on average 20.5) internal successors, (123), 6 states have internal predecessors, (123), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:42:18,731 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:42:18,732 INFO L93 Difference]: Finished difference Result 19446 states and 30893 transitions. [2021-11-07 01:42:18,732 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-07 01:42:18,732 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 20.5) internal successors, (123), 6 states have internal predecessors, (123), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 123 [2021-11-07 01:42:18,733 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:42:18,759 INFO L225 Difference]: With dead ends: 19446 [2021-11-07 01:42:18,759 INFO L226 Difference]: Without dead ends: 9836 [2021-11-07 01:42:18,777 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=24, Invalid=32, Unknown=0, NotChecked=0, Total=56 [2021-11-07 01:42:18,789 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9836 states. [2021-11-07 01:42:19,271 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9836 to 9834. [2021-11-07 01:42:19,286 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 9834 states, 9833 states have (on average 1.5860876639886097) internal successors, (15596), 9833 states have internal predecessors, (15596), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:42:19,307 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9834 states to 9834 states and 15596 transitions. [2021-11-07 01:42:19,307 INFO L78 Accepts]: Start accepts. Automaton has 9834 states and 15596 transitions. Word has length 123 [2021-11-07 01:42:19,308 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:42:19,308 INFO L470 AbstractCegarLoop]: Abstraction has 9834 states and 15596 transitions. [2021-11-07 01:42:19,308 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 20.5) internal successors, (123), 6 states have internal predecessors, (123), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:42:19,308 INFO L276 IsEmpty]: Start isEmpty. Operand 9834 states and 15596 transitions. [2021-11-07 01:42:19,309 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 127 [2021-11-07 01:42:19,309 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:42:19,309 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 01:42:19,310 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2021-11-07 01:42:19,310 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:42:19,310 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:42:19,310 INFO L85 PathProgramCache]: Analyzing trace with hash 2074575841, now seen corresponding path program 1 times [2021-11-07 01:42:19,311 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 01:42:19,311 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1589281655] [2021-11-07 01:42:19,311 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:42:19,311 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 01:42:19,349 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:42:19,501 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:42:19,501 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 01:42:19,501 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1589281655] [2021-11-07 01:42:19,502 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1589281655] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 01:42:19,502 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 01:42:19,502 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-07 01:42:19,502 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1657019022] [2021-11-07 01:42:19,503 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-07 01:42:19,503 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 01:42:19,503 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-07 01:42:19,504 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2021-11-07 01:42:19,504 INFO L87 Difference]: Start difference. First operand 9834 states and 15596 transitions. Second operand has 6 states, 6 states have (on average 21.0) internal successors, (126), 6 states have internal predecessors, (126), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:42:20,484 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:42:20,484 INFO L93 Difference]: Finished difference Result 24515 states and 38805 transitions. [2021-11-07 01:42:20,485 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2021-11-07 01:42:20,485 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 21.0) internal successors, (126), 6 states have internal predecessors, (126), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 126 [2021-11-07 01:42:20,485 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:42:20,527 INFO L225 Difference]: With dead ends: 24515 [2021-11-07 01:42:20,527 INFO L226 Difference]: Without dead ends: 14905 [2021-11-07 01:42:20,543 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=24, Invalid=32, Unknown=0, NotChecked=0, Total=56 [2021-11-07 01:42:20,562 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14905 states. [2021-11-07 01:42:21,474 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14905 to 14903. [2021-11-07 01:42:21,496 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 14903 states, 14902 states have (on average 1.5780432156757482) internal successors, (23516), 14902 states have internal predecessors, (23516), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:42:21,542 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14903 states to 14903 states and 23516 transitions. [2021-11-07 01:42:21,542 INFO L78 Accepts]: Start accepts. Automaton has 14903 states and 23516 transitions. Word has length 126 [2021-11-07 01:42:21,543 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:42:21,543 INFO L470 AbstractCegarLoop]: Abstraction has 14903 states and 23516 transitions. [2021-11-07 01:42:21,543 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 21.0) internal successors, (126), 6 states have internal predecessors, (126), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:42:21,544 INFO L276 IsEmpty]: Start isEmpty. Operand 14903 states and 23516 transitions. [2021-11-07 01:42:21,545 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 128 [2021-11-07 01:42:21,545 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:42:21,546 INFO L513 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 01:42:21,546 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2021-11-07 01:42:21,546 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:42:21,547 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:42:21,547 INFO L85 PathProgramCache]: Analyzing trace with hash -79473702, now seen corresponding path program 1 times [2021-11-07 01:42:21,547 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 01:42:21,551 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [728370467] [2021-11-07 01:42:21,551 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:42:21,551 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 01:42:21,667 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:42:21,785 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-07 01:42:21,785 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 01:42:21,785 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [728370467] [2021-11-07 01:42:21,788 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [728370467] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 01:42:21,788 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 01:42:21,788 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2021-11-07 01:42:21,789 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [247530872] [2021-11-07 01:42:21,789 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-07 01:42:21,789 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 01:42:21,790 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-07 01:42:21,790 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-11-07 01:42:21,791 INFO L87 Difference]: Start difference. First operand 14903 states and 23516 transitions. Second operand has 6 states, 6 states have (on average 21.166666666666668) internal successors, (127), 6 states have internal predecessors, (127), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:42:22,866 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:42:22,867 INFO L93 Difference]: Finished difference Result 18211 states and 28624 transitions. [2021-11-07 01:42:22,867 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2021-11-07 01:42:22,867 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 21.166666666666668) internal successors, (127), 6 states have internal predecessors, (127), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 127 [2021-11-07 01:42:22,867 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:42:22,901 INFO L225 Difference]: With dead ends: 18211 [2021-11-07 01:42:22,901 INFO L226 Difference]: Without dead ends: 18209 [2021-11-07 01:42:22,906 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=30, Invalid=60, Unknown=0, NotChecked=0, Total=90 [2021-11-07 01:42:22,926 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18209 states. [2021-11-07 01:42:23,545 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18209 to 14917. [2021-11-07 01:42:23,563 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 14917 states, 14916 states have (on average 1.5761598283722178) internal successors, (23510), 14916 states have internal predecessors, (23510), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:42:23,596 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14917 states to 14917 states and 23510 transitions. [2021-11-07 01:42:23,597 INFO L78 Accepts]: Start accepts. Automaton has 14917 states and 23510 transitions. Word has length 127 [2021-11-07 01:42:23,597 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:42:23,597 INFO L470 AbstractCegarLoop]: Abstraction has 14917 states and 23510 transitions. [2021-11-07 01:42:23,597 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 21.166666666666668) internal successors, (127), 6 states have internal predecessors, (127), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:42:23,597 INFO L276 IsEmpty]: Start isEmpty. Operand 14917 states and 23510 transitions. [2021-11-07 01:42:23,599 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 140 [2021-11-07 01:42:23,599 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:42:23,599 INFO L513 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 01:42:23,600 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2021-11-07 01:42:23,600 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:42:23,600 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:42:23,601 INFO L85 PathProgramCache]: Analyzing trace with hash -1107902553, now seen corresponding path program 1 times [2021-11-07 01:42:23,601 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 01:42:23,601 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [326669214] [2021-11-07 01:42:23,601 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:42:23,601 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 01:42:23,719 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:42:25,018 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 2 proven. 8 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2021-11-07 01:42:25,019 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 01:42:25,019 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [326669214] [2021-11-07 01:42:25,019 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [326669214] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-07 01:42:25,019 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2116479294] [2021-11-07 01:42:25,019 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:42:25,019 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 01:42:25,019 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf028e26-a3cb-4fbe-9adf-0acde14a0be5/bin/utaipan-UUZaoUuFF8/z3 [2021-11-07 01:42:25,021 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf028e26-a3cb-4fbe-9adf-0acde14a0be5/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-07 01:42:25,032 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf028e26-a3cb-4fbe-9adf-0acde14a0be5/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-07 01:42:25,248 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:42:25,252 INFO L263 TraceCheckSpWp]: Trace formula consists of 662 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-07 01:42:25,267 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-07 01:42:25,886 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-07 01:42:25,887 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-07 01:42:26,352 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-07 01:42:26,353 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2116479294] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-07 01:42:26,353 INFO L186 FreeRefinementEngine]: Constructing automaton from 2 perfect and 1 imperfect interpolant sequences. [2021-11-07 01:42:26,353 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [13] total 16 [2021-11-07 01:42:26,353 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1662062252] [2021-11-07 01:42:26,354 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2021-11-07 01:42:26,354 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 01:42:26,355 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2021-11-07 01:42:26,355 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=183, Unknown=0, NotChecked=0, Total=240 [2021-11-07 01:42:26,355 INFO L87 Difference]: Start difference. First operand 14917 states and 23510 transitions. Second operand has 5 states, 5 states have (on average 27.2) internal successors, (136), 4 states have internal predecessors, (136), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:42:27,990 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:42:27,990 INFO L93 Difference]: Finished difference Result 43795 states and 68999 transitions. [2021-11-07 01:42:27,990 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-07 01:42:27,990 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 27.2) internal successors, (136), 4 states have internal predecessors, (136), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 139 [2021-11-07 01:42:27,991 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:42:28,042 INFO L225 Difference]: With dead ends: 43795 [2021-11-07 01:42:28,043 INFO L226 Difference]: Without dead ends: 28887 [2021-11-07 01:42:28,067 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 290 GetRequests, 274 SyntacticMatches, 1 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 71 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=62, Invalid=210, Unknown=0, NotChecked=0, Total=272 [2021-11-07 01:42:28,101 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28887 states. [2021-11-07 01:42:29,558 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28887 to 28885. [2021-11-07 01:42:29,583 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28885 states, 28884 states have (on average 1.5686539260490238) internal successors, (45309), 28884 states have internal predecessors, (45309), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:42:29,637 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28885 states to 28885 states and 45309 transitions. [2021-11-07 01:42:29,637 INFO L78 Accepts]: Start accepts. Automaton has 28885 states and 45309 transitions. Word has length 139 [2021-11-07 01:42:29,637 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:42:29,637 INFO L470 AbstractCegarLoop]: Abstraction has 28885 states and 45309 transitions. [2021-11-07 01:42:29,637 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 27.2) internal successors, (136), 4 states have internal predecessors, (136), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:42:29,638 INFO L276 IsEmpty]: Start isEmpty. Operand 28885 states and 45309 transitions. [2021-11-07 01:42:29,639 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 141 [2021-11-07 01:42:29,640 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:42:29,640 INFO L513 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 01:42:29,666 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf028e26-a3cb-4fbe-9adf-0acde14a0be5/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-07 01:42:29,840 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_bf028e26-a3cb-4fbe-9adf-0acde14a0be5/bin/utaipan-UUZaoUuFF8/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-07 01:42:29,844 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:42:29,844 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:42:29,844 INFO L85 PathProgramCache]: Analyzing trace with hash 548558216, now seen corresponding path program 1 times [2021-11-07 01:42:29,845 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 01:42:29,845 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [360478769] [2021-11-07 01:42:29,845 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:42:29,845 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 01:42:29,875 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:42:29,912 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2021-11-07 01:42:29,913 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 01:42:29,913 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [360478769] [2021-11-07 01:42:29,913 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [360478769] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 01:42:29,913 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 01:42:29,914 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-07 01:42:29,914 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1962578392] [2021-11-07 01:42:29,914 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-07 01:42:29,915 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 01:42:29,915 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-07 01:42:29,915 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 01:42:29,915 INFO L87 Difference]: Start difference. First operand 28885 states and 45309 transitions. Second operand has 3 states, 3 states have (on average 45.0) internal successors, (135), 3 states have internal predecessors, (135), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:42:32,324 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:42:32,324 INFO L93 Difference]: Finished difference Result 69252 states and 109204 transitions. [2021-11-07 01:42:32,325 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-07 01:42:32,325 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 45.0) internal successors, (135), 3 states have internal predecessors, (135), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 140 [2021-11-07 01:42:32,326 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:42:32,407 INFO L225 Difference]: With dead ends: 69252 [2021-11-07 01:42:32,408 INFO L226 Difference]: Without dead ends: 40691 [2021-11-07 01:42:32,446 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 01:42:32,493 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40691 states. [2021-11-07 01:42:34,685 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40691 to 40689. [2021-11-07 01:42:34,724 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40689 states, 40688 states have (on average 1.5586659457333858) internal successors, (63419), 40688 states have internal predecessors, (63419), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:42:34,806 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40689 states to 40689 states and 63419 transitions. [2021-11-07 01:42:34,806 INFO L78 Accepts]: Start accepts. Automaton has 40689 states and 63419 transitions. Word has length 140 [2021-11-07 01:42:34,806 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:42:34,806 INFO L470 AbstractCegarLoop]: Abstraction has 40689 states and 63419 transitions. [2021-11-07 01:42:34,806 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 45.0) internal successors, (135), 3 states have internal predecessors, (135), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:42:34,807 INFO L276 IsEmpty]: Start isEmpty. Operand 40689 states and 63419 transitions. [2021-11-07 01:42:34,808 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 142 [2021-11-07 01:42:34,808 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:42:34,808 INFO L513 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 01:42:34,809 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2021-11-07 01:42:34,809 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:42:34,809 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:42:34,809 INFO L85 PathProgramCache]: Analyzing trace with hash 1107242763, now seen corresponding path program 1 times [2021-11-07 01:42:34,809 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 01:42:34,809 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [443665447] [2021-11-07 01:42:34,810 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:42:34,810 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 01:42:34,839 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:42:34,887 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 6 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-07 01:42:34,888 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 01:42:34,888 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [443665447] [2021-11-07 01:42:34,888 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [443665447] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 01:42:34,888 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 01:42:34,888 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-07 01:42:34,889 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1959656102] [2021-11-07 01:42:34,889 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-07 01:42:34,889 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 01:42:34,890 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-07 01:42:34,890 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 01:42:34,890 INFO L87 Difference]: Start difference. First operand 40689 states and 63419 transitions. Second operand has 3 states, 3 states have (on average 46.0) internal successors, (138), 3 states have internal predecessors, (138), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:42:39,324 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:42:39,325 INFO L93 Difference]: Finished difference Result 120268 states and 187383 transitions. [2021-11-07 01:42:39,325 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-07 01:42:39,325 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 46.0) internal successors, (138), 3 states have internal predecessors, (138), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 141 [2021-11-07 01:42:39,326 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:42:39,487 INFO L225 Difference]: With dead ends: 120268 [2021-11-07 01:42:39,487 INFO L226 Difference]: Without dead ends: 79700 [2021-11-07 01:42:39,530 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 01:42:39,613 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79700 states. [2021-11-07 01:42:44,257 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79700 to 79698. [2021-11-07 01:42:44,321 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 79698 states, 79697 states have (on average 1.553596747681845) internal successors, (123817), 79697 states have internal predecessors, (123817), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:42:44,519 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79698 states to 79698 states and 123817 transitions. [2021-11-07 01:42:44,519 INFO L78 Accepts]: Start accepts. Automaton has 79698 states and 123817 transitions. Word has length 141 [2021-11-07 01:42:44,519 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-07 01:42:44,520 INFO L470 AbstractCegarLoop]: Abstraction has 79698 states and 123817 transitions. [2021-11-07 01:42:44,520 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 46.0) internal successors, (138), 3 states have internal predecessors, (138), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:42:44,520 INFO L276 IsEmpty]: Start isEmpty. Operand 79698 states and 123817 transitions. [2021-11-07 01:42:44,525 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 142 [2021-11-07 01:42:44,525 INFO L505 BasicCegarLoop]: Found error trace [2021-11-07 01:42:44,526 INFO L513 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, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-07 01:42:44,526 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2021-11-07 01:42:44,526 INFO L402 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-07 01:42:44,527 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-07 01:42:44,527 INFO L85 PathProgramCache]: Analyzing trace with hash -1402656987, now seen corresponding path program 1 times [2021-11-07 01:42:44,527 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-07 01:42:44,527 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [153896562] [2021-11-07 01:42:44,528 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-07 01:42:44,528 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-07 01:42:44,547 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-07 01:42:44,580 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-07 01:42:44,581 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-07 01:42:44,581 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [153896562] [2021-11-07 01:42:44,581 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [153896562] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-07 01:42:44,581 INFO L186 FreeRefinementEngine]: Constructing automaton from 1 perfect and 0 imperfect interpolant sequences. [2021-11-07 01:42:44,581 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-07 01:42:44,582 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1442448737] [2021-11-07 01:42:44,582 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-07 01:42:44,582 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-07 01:42:44,583 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-07 01:42:44,583 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 01:42:44,583 INFO L87 Difference]: Start difference. First operand 79698 states and 123817 transitions. Second operand has 3 states, 3 states have (on average 45.0) internal successors, (135), 3 states have internal predecessors, (135), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-07 01:42:53,946 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-07 01:42:53,947 INFO L93 Difference]: Finished difference Result 238942 states and 371218 transitions. [2021-11-07 01:42:53,947 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-07 01:42:53,948 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 45.0) internal successors, (135), 3 states have internal predecessors, (135), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 141 [2021-11-07 01:42:53,948 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-07 01:42:54,345 INFO L225 Difference]: With dead ends: 238942 [2021-11-07 01:42:54,345 INFO L226 Difference]: Without dead ends: 159376 [2021-11-07 01:42:54,449 INFO L786 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-07 01:42:54,586 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 159376 states.