./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/eca-rers2012/Problem03_label09.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version aef121e0 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5eea9fcf-171d-4af2-a26f-e65bc7515707/bin/utaipan-EQgc7hIp5V/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5eea9fcf-171d-4af2-a26f-e65bc7515707/bin/utaipan-EQgc7hIp5V/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5eea9fcf-171d-4af2-a26f-e65bc7515707/bin/utaipan-EQgc7hIp5V/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5eea9fcf-171d-4af2-a26f-e65bc7515707/bin/utaipan-EQgc7hIp5V/config/TaipanReach.xml -i ../../sv-benchmarks/c/eca-rers2012/Problem03_label09.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5eea9fcf-171d-4af2-a26f-e65bc7515707/bin/utaipan-EQgc7hIp5V/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5eea9fcf-171d-4af2-a26f-e65bc7515707/bin/utaipan-EQgc7hIp5V --witnessprinter.witness.filename witness.graphml --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 759500fc885fd8551afb1744440c02e812929b084934756d49ccfd6e6b033437 --- Real Ultimate output --- This is Ultimate 0.2.1-dev-aef121e [2021-11-23 02:50:39,226 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-23 02:50:39,228 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-23 02:50:39,260 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-23 02:50:39,261 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-23 02:50:39,263 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-23 02:50:39,265 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-23 02:50:39,267 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-23 02:50:39,269 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-23 02:50:39,271 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-23 02:50:39,272 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-23 02:50:39,274 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-23 02:50:39,274 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-23 02:50:39,276 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-23 02:50:39,278 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-23 02:50:39,279 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-23 02:50:39,281 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-23 02:50:39,282 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-23 02:50:39,285 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-23 02:50:39,287 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-23 02:50:39,289 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-23 02:50:39,291 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-23 02:50:39,293 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-23 02:50:39,294 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-23 02:50:39,298 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-23 02:50:39,298 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-23 02:50:39,299 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-23 02:50:39,300 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-23 02:50:39,301 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-23 02:50:39,302 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-23 02:50:39,303 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-23 02:50:39,304 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-23 02:50:39,305 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-23 02:50:39,306 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-23 02:50:39,307 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-23 02:50:39,308 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-23 02:50:39,309 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-23 02:50:39,309 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-23 02:50:39,310 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-23 02:50:39,311 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-23 02:50:39,312 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-23 02:50:39,312 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5eea9fcf-171d-4af2-a26f-e65bc7515707/bin/utaipan-EQgc7hIp5V/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-23 02:50:39,345 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-23 02:50:39,345 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-23 02:50:39,346 INFO L136 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2021-11-23 02:50:39,346 INFO L138 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2021-11-23 02:50:39,347 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-23 02:50:39,347 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-23 02:50:39,347 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-23 02:50:39,348 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-23 02:50:39,348 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-23 02:50:39,348 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-23 02:50:39,348 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-23 02:50:39,348 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-23 02:50:39,349 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-23 02:50:39,349 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-23 02:50:39,349 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-23 02:50:39,349 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-23 02:50:39,350 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-23 02:50:39,350 INFO L138 SettingsManager]: * Simplification Technique=POLY_PAC [2021-11-23 02:50:39,351 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-23 02:50:39,351 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-23 02:50:39,351 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-23 02:50:39,351 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-23 02:50:39,352 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-23 02:50:39,352 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-23 02:50:39,352 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-23 02:50:39,352 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-23 02:50:39,352 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-23 02:50:39,353 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-23 02:50:39,353 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-23 02:50:39,353 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-23 02:50:39,353 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-23 02:50:39,354 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-23 02:50:39,354 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 02:50:39,354 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-23 02:50:39,354 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-23 02:50:39,354 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-23 02:50:39,355 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-23 02:50:39,355 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-23 02:50:39,355 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-23 02:50:39,355 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-23 02:50:39,355 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-23 02:50:39,356 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_5eea9fcf-171d-4af2-a26f-e65bc7515707/bin/utaipan-EQgc7hIp5V/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5eea9fcf-171d-4af2-a26f-e65bc7515707/bin/utaipan-EQgc7hIp5V Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 759500fc885fd8551afb1744440c02e812929b084934756d49ccfd6e6b033437 [2021-11-23 02:50:39,614 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-23 02:50:39,642 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-23 02:50:39,645 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-23 02:50:39,646 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-23 02:50:39,647 INFO L275 PluginConnector]: CDTParser initialized [2021-11-23 02:50:39,649 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5eea9fcf-171d-4af2-a26f-e65bc7515707/bin/utaipan-EQgc7hIp5V/../../sv-benchmarks/c/eca-rers2012/Problem03_label09.c [2021-11-23 02:50:39,724 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5eea9fcf-171d-4af2-a26f-e65bc7515707/bin/utaipan-EQgc7hIp5V/data/296a23f98/825283a94d4741dbb6af2052fd12b723/FLAG58ad2994f [2021-11-23 02:50:40,498 INFO L306 CDTParser]: Found 1 translation units. [2021-11-23 02:50:40,498 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5eea9fcf-171d-4af2-a26f-e65bc7515707/sv-benchmarks/c/eca-rers2012/Problem03_label09.c [2021-11-23 02:50:40,522 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5eea9fcf-171d-4af2-a26f-e65bc7515707/bin/utaipan-EQgc7hIp5V/data/296a23f98/825283a94d4741dbb6af2052fd12b723/FLAG58ad2994f [2021-11-23 02:50:41,044 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5eea9fcf-171d-4af2-a26f-e65bc7515707/bin/utaipan-EQgc7hIp5V/data/296a23f98/825283a94d4741dbb6af2052fd12b723 [2021-11-23 02:50:41,048 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-23 02:50:41,050 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-23 02:50:41,055 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-23 02:50:41,055 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-23 02:50:41,059 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-23 02:50:41,059 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 02:50:41" (1/1) ... [2021-11-23 02:50:41,060 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1797b967 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:50:41, skipping insertion in model container [2021-11-23 02:50:41,061 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 02:50:41" (1/1) ... [2021-11-23 02:50:41,070 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-23 02:50:41,159 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-23 02:50:41,817 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5eea9fcf-171d-4af2-a26f-e65bc7515707/sv-benchmarks/c/eca-rers2012/Problem03_label09.c[54191,54204] [2021-11-23 02:50:41,872 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 02:50:41,893 INFO L203 MainTranslator]: Completed pre-run [2021-11-23 02:50:42,225 WARN L230 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5eea9fcf-171d-4af2-a26f-e65bc7515707/sv-benchmarks/c/eca-rers2012/Problem03_label09.c[54191,54204] [2021-11-23 02:50:42,269 INFO L209 PostProcessor]: Analyzing one entry point: main [2021-11-23 02:50:42,291 INFO L208 MainTranslator]: Completed translation [2021-11-23 02:50:42,292 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:50:42 WrapperNode [2021-11-23 02:50:42,292 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-23 02:50:42,294 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-23 02:50:42,294 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-23 02:50:42,294 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-23 02:50:42,303 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:50:42" (1/1) ... [2021-11-23 02:50:42,349 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:50:42" (1/1) ... [2021-11-23 02:50:42,453 INFO L137 Inliner]: procedures = 14, calls = 8, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 1771 [2021-11-23 02:50:42,455 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-23 02:50:42,456 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-23 02:50:42,456 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-23 02:50:42,456 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-23 02:50:42,466 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:50:42" (1/1) ... [2021-11-23 02:50:42,468 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:50:42" (1/1) ... [2021-11-23 02:50:42,480 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:50:42" (1/1) ... [2021-11-23 02:50:42,480 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:50:42" (1/1) ... [2021-11-23 02:50:42,544 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:50:42" (1/1) ... [2021-11-23 02:50:42,557 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:50:42" (1/1) ... [2021-11-23 02:50:42,567 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:50:42" (1/1) ... [2021-11-23 02:50:42,582 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-23 02:50:42,584 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-23 02:50:42,584 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-23 02:50:42,584 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-23 02:50:42,585 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:50:42" (1/1) ... [2021-11-23 02:50:42,597 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-23 02:50:42,656 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5eea9fcf-171d-4af2-a26f-e65bc7515707/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:50:42,669 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5eea9fcf-171d-4af2-a26f-e65bc7515707/bin/utaipan-EQgc7hIp5V/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-23 02:50:42,691 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5eea9fcf-171d-4af2-a26f-e65bc7515707/bin/utaipan-EQgc7hIp5V/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-23 02:50:42,730 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2021-11-23 02:50:42,730 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-23 02:50:42,731 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-23 02:50:42,731 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-23 02:50:42,822 INFO L236 CfgBuilder]: Building ICFG [2021-11-23 02:50:42,824 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2021-11-23 02:50:44,624 INFO L277 CfgBuilder]: Performing block encoding [2021-11-23 02:50:44,889 INFO L296 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-23 02:50:44,889 INFO L301 CfgBuilder]: Removed 1 assume(true) statements. [2021-11-23 02:50:44,892 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 02:50:44 BoogieIcfgContainer [2021-11-23 02:50:44,892 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-23 02:50:44,894 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-23 02:50:44,894 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-23 02:50:44,897 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-23 02:50:44,898 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.11 02:50:41" (1/3) ... [2021-11-23 02:50:44,899 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@a25678e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 02:50:44, skipping insertion in model container [2021-11-23 02:50:44,899 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 02:50:42" (2/3) ... [2021-11-23 02:50:44,899 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@a25678e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 02:50:44, skipping insertion in model container [2021-11-23 02:50:44,899 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 02:50:44" (3/3) ... [2021-11-23 02:50:44,901 INFO L111 eAbstractionObserver]: Analyzing ICFG Problem03_label09.c [2021-11-23 02:50:44,906 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-23 02:50:44,906 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-23 02:50:44,955 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-23 02:50:44,962 INFO L339 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopsAndPotentialCycles, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mLoopAccelerationTechnique=FAST_UPR [2021-11-23 02:50:44,962 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-23 02:50:44,981 INFO L276 IsEmpty]: Start isEmpty. Operand has 148 states, 146 states have (on average 1.9726027397260273) internal successors, (288), 147 states have internal predecessors, (288), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:50:44,994 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 144 [2021-11-23 02:50:44,994 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:50:44,995 INFO L514 BasicCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:50:44,996 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:50:45,001 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:50:45,001 INFO L85 PathProgramCache]: Analyzing trace with hash -1724868360, now seen corresponding path program 1 times [2021-11-23 02:50:45,010 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:50:45,011 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [558687825] [2021-11-23 02:50:45,011 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:50:45,012 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:50:45,294 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:50:45,648 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:50:45,649 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:50:45,649 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [558687825] [2021-11-23 02:50:45,650 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [558687825] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:50:45,650 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:50:45,650 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-23 02:50:45,652 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [718356950] [2021-11-23 02:50:45,653 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:50:45,659 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 02:50:45,660 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:50:45,694 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 02:50:45,696 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 02:50:45,701 INFO L87 Difference]: Start difference. First operand has 148 states, 146 states have (on average 1.9726027397260273) internal successors, (288), 147 states have internal predecessors, (288), 0 states have call successors, (0), 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 47.666666666666664) internal successors, (143), 2 states have internal predecessors, (143), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:50:46,694 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:50:46,694 INFO L93 Difference]: Finished difference Result 440 states and 860 transitions. [2021-11-23 02:50:46,696 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 02:50:46,697 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 47.666666666666664) internal successors, (143), 2 states have internal predecessors, (143), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 143 [2021-11-23 02:50:46,699 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:50:46,712 INFO L225 Difference]: With dead ends: 440 [2021-11-23 02:50:46,713 INFO L226 Difference]: Without dead ends: 289 [2021-11-23 02:50:46,716 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 02:50:46,720 INFO L933 BasicCegarLoop]: 25 mSDtfsCounter, 10 mSDsluCounter, 6 mSDsCounter, 0 mSdLazyCounter, 471 mSolverCounterSat, 149 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 30 SdHoareTripleChecker+Invalid, 620 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 149 IncrementalHoareTripleChecker+Valid, 471 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2021-11-23 02:50:46,722 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [10 Valid, 30 Invalid, 620 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [149 Valid, 471 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2021-11-23 02:50:46,742 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 289 states. [2021-11-23 02:50:46,783 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 289 to 289. [2021-11-23 02:50:46,785 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 289 states, 288 states have (on average 1.8923611111111112) internal successors, (545), 288 states have internal predecessors, (545), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:50:46,787 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 289 states to 289 states and 545 transitions. [2021-11-23 02:50:46,789 INFO L78 Accepts]: Start accepts. Automaton has 289 states and 545 transitions. Word has length 143 [2021-11-23 02:50:46,790 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:50:46,790 INFO L470 AbstractCegarLoop]: Abstraction has 289 states and 545 transitions. [2021-11-23 02:50:46,791 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 47.666666666666664) internal successors, (143), 2 states have internal predecessors, (143), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:50:46,791 INFO L276 IsEmpty]: Start isEmpty. Operand 289 states and 545 transitions. [2021-11-23 02:50:46,796 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 150 [2021-11-23 02:50:46,797 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:50:46,797 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:50:46,798 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-23 02:50:46,798 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:50:46,799 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:50:46,799 INFO L85 PathProgramCache]: Analyzing trace with hash 1067661148, now seen corresponding path program 1 times [2021-11-23 02:50:46,800 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:50:46,800 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1006287435] [2021-11-23 02:50:46,800 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:50:46,801 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:50:46,835 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:50:46,904 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 5 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:50:46,904 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:50:46,904 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1006287435] [2021-11-23 02:50:46,905 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1006287435] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:50:46,905 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:50:46,905 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-23 02:50:46,906 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [258767713] [2021-11-23 02:50:46,906 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:50:46,907 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 02:50:46,908 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:50:46,908 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 02:50:46,909 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 02:50:46,909 INFO L87 Difference]: Start difference. First operand 289 states and 545 transitions. Second operand has 3 states, 3 states have (on average 49.666666666666664) internal successors, (149), 2 states have internal predecessors, (149), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:50:47,681 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:50:47,682 INFO L93 Difference]: Finished difference Result 863 states and 1632 transitions. [2021-11-23 02:50:47,686 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 02:50:47,686 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 49.666666666666664) internal successors, (149), 2 states have internal predecessors, (149), 0 states have call successors, (0), 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 149 [2021-11-23 02:50:47,687 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:50:47,691 INFO L225 Difference]: With dead ends: 863 [2021-11-23 02:50:47,691 INFO L226 Difference]: Without dead ends: 575 [2021-11-23 02:50:47,693 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 02:50:47,695 INFO L933 BasicCegarLoop]: 93 mSDtfsCounter, 150 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 451 mSolverCounterSat, 123 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 150 SdHoareTripleChecker+Valid, 97 SdHoareTripleChecker+Invalid, 574 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 123 IncrementalHoareTripleChecker+Valid, 451 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2021-11-23 02:50:47,696 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [150 Valid, 97 Invalid, 574 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [123 Valid, 451 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2021-11-23 02:50:47,698 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 575 states. [2021-11-23 02:50:47,726 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 575 to 575. [2021-11-23 02:50:47,728 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 575 states, 574 states have (on average 1.5592334494773519) internal successors, (895), 574 states have internal predecessors, (895), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:50:47,730 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 575 states to 575 states and 895 transitions. [2021-11-23 02:50:47,731 INFO L78 Accepts]: Start accepts. Automaton has 575 states and 895 transitions. Word has length 149 [2021-11-23 02:50:47,731 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:50:47,731 INFO L470 AbstractCegarLoop]: Abstraction has 575 states and 895 transitions. [2021-11-23 02:50:47,732 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 49.666666666666664) internal successors, (149), 2 states have internal predecessors, (149), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:50:47,732 INFO L276 IsEmpty]: Start isEmpty. Operand 575 states and 895 transitions. [2021-11-23 02:50:47,736 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 158 [2021-11-23 02:50:47,737 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:50:47,737 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:50:47,737 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2021-11-23 02:50:47,738 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:50:47,738 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:50:47,738 INFO L85 PathProgramCache]: Analyzing trace with hash 1008637883, now seen corresponding path program 1 times [2021-11-23 02:50:47,739 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:50:47,739 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2034767232] [2021-11-23 02:50:47,739 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:50:47,739 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:50:47,781 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:50:47,833 INFO L134 CoverageAnalysis]: Checked inductivity of 18 backedges. 12 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-23 02:50:47,833 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:50:47,834 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2034767232] [2021-11-23 02:50:47,834 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2034767232] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:50:47,834 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:50:47,834 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-23 02:50:47,835 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1325235365] [2021-11-23 02:50:47,835 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:50:47,835 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 02:50:47,836 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:50:47,836 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 02:50:47,836 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 02:50:47,837 INFO L87 Difference]: Start difference. First operand 575 states and 895 transitions. Second operand has 3 states, 3 states have (on average 50.666666666666664) internal successors, (152), 2 states have internal predecessors, (152), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:50:48,531 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:50:48,531 INFO L93 Difference]: Finished difference Result 1721 states and 2682 transitions. [2021-11-23 02:50:48,532 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 02:50:48,532 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 50.666666666666664) internal successors, (152), 2 states have internal predecessors, (152), 0 states have call successors, (0), 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 157 [2021-11-23 02:50:48,532 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:50:48,539 INFO L225 Difference]: With dead ends: 1721 [2021-11-23 02:50:48,539 INFO L226 Difference]: Without dead ends: 1147 [2021-11-23 02:50:48,542 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 02:50:48,544 INFO L933 BasicCegarLoop]: 21 mSDtfsCounter, 157 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 452 mSolverCounterSat, 170 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 157 SdHoareTripleChecker+Valid, 25 SdHoareTripleChecker+Invalid, 622 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 170 IncrementalHoareTripleChecker+Valid, 452 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2021-11-23 02:50:48,544 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [157 Valid, 25 Invalid, 622 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [170 Valid, 452 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2021-11-23 02:50:48,546 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1147 states. [2021-11-23 02:50:48,585 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1147 to 1147. [2021-11-23 02:50:48,588 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1147 states, 1146 states have (on average 1.5235602094240839) internal successors, (1746), 1146 states have internal predecessors, (1746), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:50:48,593 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1147 states to 1147 states and 1746 transitions. [2021-11-23 02:50:48,593 INFO L78 Accepts]: Start accepts. Automaton has 1147 states and 1746 transitions. Word has length 157 [2021-11-23 02:50:48,593 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:50:48,594 INFO L470 AbstractCegarLoop]: Abstraction has 1147 states and 1746 transitions. [2021-11-23 02:50:48,594 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 50.666666666666664) internal successors, (152), 2 states have internal predecessors, (152), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:50:48,594 INFO L276 IsEmpty]: Start isEmpty. Operand 1147 states and 1746 transitions. [2021-11-23 02:50:48,600 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 173 [2021-11-23 02:50:48,600 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:50:48,601 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 3, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:50:48,601 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2021-11-23 02:50:48,601 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:50:48,602 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:50:48,602 INFO L85 PathProgramCache]: Analyzing trace with hash 1359918154, now seen corresponding path program 1 times [2021-11-23 02:50:48,602 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:50:48,603 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1652987833] [2021-11-23 02:50:48,603 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:50:48,603 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:50:48,638 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:50:48,687 INFO L134 CoverageAnalysis]: Checked inductivity of 48 backedges. 42 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-23 02:50:48,687 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:50:48,688 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1652987833] [2021-11-23 02:50:48,688 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1652987833] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:50:48,688 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:50:48,688 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 02:50:48,689 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [378725087] [2021-11-23 02:50:48,689 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:50:48,689 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 02:50:48,690 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:50:48,690 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 02:50:48,690 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 02:50:48,691 INFO L87 Difference]: Start difference. First operand 1147 states and 1746 transitions. Second operand has 3 states, 3 states have (on average 55.666666666666664) internal successors, (167), 3 states have internal predecessors, (167), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:50:49,097 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:50:49,097 INFO L93 Difference]: Finished difference Result 3439 states and 5236 transitions. [2021-11-23 02:50:49,098 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 02:50:49,098 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 55.666666666666664) internal successors, (167), 3 states have internal predecessors, (167), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 172 [2021-11-23 02:50:49,098 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:50:49,111 INFO L225 Difference]: With dead ends: 3439 [2021-11-23 02:50:49,112 INFO L226 Difference]: Without dead ends: 2293 [2021-11-23 02:50:49,114 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 02:50:49,115 INFO L933 BasicCegarLoop]: 167 mSDtfsCounter, 244 mSDsluCounter, 161 mSDsCounter, 0 mSdLazyCounter, 213 mSolverCounterSat, 55 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 244 SdHoareTripleChecker+Valid, 318 SdHoareTripleChecker+Invalid, 268 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 55 IncrementalHoareTripleChecker+Valid, 213 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-23 02:50:49,116 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [244 Valid, 318 Invalid, 268 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [55 Valid, 213 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-23 02:50:49,119 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2293 states. [2021-11-23 02:50:49,165 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2293 to 2291. [2021-11-23 02:50:49,170 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 2291 states, 2290 states have (on average 1.520524017467249) internal successors, (3482), 2290 states have internal predecessors, (3482), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:50:49,179 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 2291 states to 2291 states and 3482 transitions. [2021-11-23 02:50:49,180 INFO L78 Accepts]: Start accepts. Automaton has 2291 states and 3482 transitions. Word has length 172 [2021-11-23 02:50:49,180 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:50:49,180 INFO L470 AbstractCegarLoop]: Abstraction has 2291 states and 3482 transitions. [2021-11-23 02:50:49,180 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 55.666666666666664) internal successors, (167), 3 states have internal predecessors, (167), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:50:49,181 INFO L276 IsEmpty]: Start isEmpty. Operand 2291 states and 3482 transitions. [2021-11-23 02:50:49,187 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 177 [2021-11-23 02:50:49,187 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:50:49,188 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:50:49,188 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2021-11-23 02:50:49,188 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:50:49,189 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:50:49,189 INFO L85 PathProgramCache]: Analyzing trace with hash 574997053, now seen corresponding path program 1 times [2021-11-23 02:50:49,189 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:50:49,189 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1733222199] [2021-11-23 02:50:49,189 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:50:49,190 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:50:49,230 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:50:49,289 INFO L134 CoverageAnalysis]: Checked inductivity of 52 backedges. 46 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-23 02:50:49,289 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:50:49,289 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1733222199] [2021-11-23 02:50:49,290 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1733222199] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:50:49,290 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:50:49,290 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 02:50:49,290 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [851906200] [2021-11-23 02:50:49,290 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:50:49,291 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 02:50:49,291 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:50:49,292 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 02:50:49,292 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 02:50:49,292 INFO L87 Difference]: Start difference. First operand 2291 states and 3482 transitions. Second operand has 3 states, 3 states have (on average 57.0) internal successors, (171), 3 states have internal predecessors, (171), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:50:50,077 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:50:50,078 INFO L93 Difference]: Finished difference Result 5582 states and 8495 transitions. [2021-11-23 02:50:50,078 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 02:50:50,079 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 57.0) internal successors, (171), 3 states have internal predecessors, (171), 0 states have call successors, (0), 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 176 [2021-11-23 02:50:50,079 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:50:50,099 INFO L225 Difference]: With dead ends: 5582 [2021-11-23 02:50:50,100 INFO L226 Difference]: Without dead ends: 3292 [2021-11-23 02:50:50,104 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 02:50:50,110 INFO L933 BasicCegarLoop]: 220 mSDtfsCounter, 133 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 456 mSolverCounterSat, 123 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 133 SdHoareTripleChecker+Valid, 224 SdHoareTripleChecker+Invalid, 579 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 123 IncrementalHoareTripleChecker+Valid, 456 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2021-11-23 02:50:50,111 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [133 Valid, 224 Invalid, 579 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [123 Valid, 456 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2021-11-23 02:50:50,117 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3292 states. [2021-11-23 02:50:50,203 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3292 to 3292. [2021-11-23 02:50:50,210 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3292 states, 3291 states have (on average 1.450015192950471) internal successors, (4772), 3291 states have internal predecessors, (4772), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:50:50,283 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3292 states to 3292 states and 4772 transitions. [2021-11-23 02:50:50,284 INFO L78 Accepts]: Start accepts. Automaton has 3292 states and 4772 transitions. Word has length 176 [2021-11-23 02:50:50,284 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:50:50,284 INFO L470 AbstractCegarLoop]: Abstraction has 3292 states and 4772 transitions. [2021-11-23 02:50:50,284 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 57.0) internal successors, (171), 3 states have internal predecessors, (171), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:50:50,284 INFO L276 IsEmpty]: Start isEmpty. Operand 3292 states and 4772 transitions. [2021-11-23 02:50:50,292 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 182 [2021-11-23 02:50:50,292 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:50:50,293 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 5, 4, 4, 4, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:50:50,293 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-11-23 02:50:50,293 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:50:50,294 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:50:50,294 INFO L85 PathProgramCache]: Analyzing trace with hash 1793518977, now seen corresponding path program 1 times [2021-11-23 02:50:50,294 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:50:50,294 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [252905274] [2021-11-23 02:50:50,294 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:50:50,295 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:50:50,326 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:50:50,371 INFO L134 CoverageAnalysis]: Checked inductivity of 71 backedges. 47 proven. 0 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2021-11-23 02:50:50,371 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:50:50,371 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [252905274] [2021-11-23 02:50:50,371 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [252905274] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:50:50,371 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:50:50,372 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 02:50:50,372 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1507166907] [2021-11-23 02:50:50,372 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:50:50,372 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 02:50:50,373 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:50:50,373 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 02:50:50,373 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 02:50:50,374 INFO L87 Difference]: Start difference. First operand 3292 states and 4772 transitions. Second operand has 3 states, 3 states have (on average 53.0) internal successors, (159), 3 states have internal predecessors, (159), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:50:51,263 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:50:51,264 INFO L93 Difference]: Finished difference Result 8299 states and 12479 transitions. [2021-11-23 02:50:51,264 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 02:50:51,264 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 53.0) internal successors, (159), 3 states have internal predecessors, (159), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 181 [2021-11-23 02:50:51,265 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:50:51,298 INFO L225 Difference]: With dead ends: 8299 [2021-11-23 02:50:51,298 INFO L226 Difference]: Without dead ends: 5008 [2021-11-23 02:50:51,303 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 02:50:51,310 INFO L933 BasicCegarLoop]: 258 mSDtfsCounter, 152 mSDsluCounter, 3 mSDsCounter, 0 mSdLazyCounter, 408 mSolverCounterSat, 161 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 152 SdHoareTripleChecker+Valid, 261 SdHoareTripleChecker+Invalid, 569 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 161 IncrementalHoareTripleChecker+Valid, 408 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2021-11-23 02:50:51,313 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [152 Valid, 261 Invalid, 569 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [161 Valid, 408 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2021-11-23 02:50:51,319 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 5008 states. [2021-11-23 02:50:51,423 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 5008 to 5008. [2021-11-23 02:50:51,497 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 5008 states, 5007 states have (on average 1.3752746155382465) internal successors, (6886), 5007 states have internal predecessors, (6886), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:50:51,520 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 5008 states to 5008 states and 6886 transitions. [2021-11-23 02:50:51,520 INFO L78 Accepts]: Start accepts. Automaton has 5008 states and 6886 transitions. Word has length 181 [2021-11-23 02:50:51,520 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:50:51,521 INFO L470 AbstractCegarLoop]: Abstraction has 5008 states and 6886 transitions. [2021-11-23 02:50:51,521 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 53.0) internal successors, (159), 3 states have internal predecessors, (159), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:50:51,521 INFO L276 IsEmpty]: Start isEmpty. Operand 5008 states and 6886 transitions. [2021-11-23 02:50:51,535 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 190 [2021-11-23 02:50:51,535 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:50:51,536 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 4, 4, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:50:51,536 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2021-11-23 02:50:51,536 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:50:51,537 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:50:51,537 INFO L85 PathProgramCache]: Analyzing trace with hash -364881939, now seen corresponding path program 1 times [2021-11-23 02:50:51,538 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:50:51,538 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [25318359] [2021-11-23 02:50:51,538 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:50:51,538 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:50:51,577 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:50:51,647 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 68 proven. 0 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2021-11-23 02:50:51,648 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:50:51,648 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [25318359] [2021-11-23 02:50:51,648 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [25318359] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:50:51,648 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:50:51,649 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 02:50:51,649 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1125468250] [2021-11-23 02:50:51,649 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:50:51,650 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 02:50:51,651 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:50:51,653 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 02:50:51,653 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 02:50:51,654 INFO L87 Difference]: Start difference. First operand 5008 states and 6886 transitions. Second operand has 3 states, 3 states have (on average 55.666666666666664) internal successors, (167), 3 states have internal predecessors, (167), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:50:52,575 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:50:52,576 INFO L93 Difference]: Finished difference Result 13161 states and 17989 transitions. [2021-11-23 02:50:52,576 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 02:50:52,577 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 55.666666666666664) internal successors, (167), 3 states have internal predecessors, (167), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 189 [2021-11-23 02:50:52,577 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:50:52,632 INFO L225 Difference]: With dead ends: 13161 [2021-11-23 02:50:52,632 INFO L226 Difference]: Without dead ends: 8154 [2021-11-23 02:50:52,640 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 02:50:52,644 INFO L933 BasicCegarLoop]: 259 mSDtfsCounter, 132 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 449 mSolverCounterSat, 130 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 132 SdHoareTripleChecker+Valid, 263 SdHoareTripleChecker+Invalid, 579 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 130 IncrementalHoareTripleChecker+Valid, 449 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2021-11-23 02:50:52,644 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [132 Valid, 263 Invalid, 579 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [130 Valid, 449 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2021-11-23 02:50:52,655 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 8154 states. [2021-11-23 02:50:52,857 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 8154 to 8154. [2021-11-23 02:50:52,875 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 8154 states, 8153 states have (on average 1.2974365264319883) internal successors, (10578), 8153 states have internal predecessors, (10578), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:50:52,910 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 8154 states to 8154 states and 10578 transitions. [2021-11-23 02:50:52,910 INFO L78 Accepts]: Start accepts. Automaton has 8154 states and 10578 transitions. Word has length 189 [2021-11-23 02:50:52,911 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:50:52,912 INFO L470 AbstractCegarLoop]: Abstraction has 8154 states and 10578 transitions. [2021-11-23 02:50:52,912 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 55.666666666666664) internal successors, (167), 3 states have internal predecessors, (167), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:50:52,912 INFO L276 IsEmpty]: Start isEmpty. Operand 8154 states and 10578 transitions. [2021-11-23 02:50:52,928 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 190 [2021-11-23 02:50:52,928 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:50:52,929 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:50:52,930 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2021-11-23 02:50:52,930 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:50:52,932 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:50:52,932 INFO L85 PathProgramCache]: Analyzing trace with hash -756269279, now seen corresponding path program 1 times [2021-11-23 02:50:52,932 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:50:52,933 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [898596743] [2021-11-23 02:50:52,933 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:50:52,933 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:50:52,973 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:50:53,088 INFO L134 CoverageAnalysis]: Checked inductivity of 62 backedges. 44 proven. 0 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-11-23 02:50:53,088 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:50:53,088 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [898596743] [2021-11-23 02:50:53,089 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [898596743] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:50:53,089 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:50:53,089 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-23 02:50:53,089 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1104888142] [2021-11-23 02:50:53,089 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:50:53,090 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 02:50:53,090 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:50:53,091 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 02:50:53,091 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 02:50:53,091 INFO L87 Difference]: Start difference. First operand 8154 states and 10578 transitions. Second operand has 3 states, 3 states have (on average 57.333333333333336) internal successors, (172), 2 states have internal predecessors, (172), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:50:54,012 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:50:54,012 INFO L93 Difference]: Finished difference Result 22456 states and 29362 transitions. [2021-11-23 02:50:54,013 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 02:50:54,013 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 57.333333333333336) internal successors, (172), 2 states have internal predecessors, (172), 0 states have call successors, (0), 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 189 [2021-11-23 02:50:54,013 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:50:54,069 INFO L225 Difference]: With dead ends: 22456 [2021-11-23 02:50:54,069 INFO L226 Difference]: Without dead ends: 14303 [2021-11-23 02:50:54,084 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 02:50:54,085 INFO L933 BasicCegarLoop]: 91 mSDtfsCounter, 135 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 531 mSolverCounterSat, 88 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 135 SdHoareTripleChecker+Valid, 95 SdHoareTripleChecker+Invalid, 619 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 88 IncrementalHoareTripleChecker+Valid, 531 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2021-11-23 02:50:54,085 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [135 Valid, 95 Invalid, 619 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [88 Valid, 531 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2021-11-23 02:50:54,104 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14303 states. [2021-11-23 02:50:54,351 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14303 to 13159. [2021-11-23 02:50:54,390 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 13159 states, 13158 states have (on average 1.2967016263869888) internal successors, (17062), 13158 states have internal predecessors, (17062), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:50:54,527 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13159 states to 13159 states and 17062 transitions. [2021-11-23 02:50:54,531 INFO L78 Accepts]: Start accepts. Automaton has 13159 states and 17062 transitions. Word has length 189 [2021-11-23 02:50:54,531 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:50:54,533 INFO L470 AbstractCegarLoop]: Abstraction has 13159 states and 17062 transitions. [2021-11-23 02:50:54,534 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 57.333333333333336) internal successors, (172), 2 states have internal predecessors, (172), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:50:54,534 INFO L276 IsEmpty]: Start isEmpty. Operand 13159 states and 17062 transitions. [2021-11-23 02:50:54,554 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 193 [2021-11-23 02:50:54,554 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:50:54,555 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:50:54,555 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2021-11-23 02:50:54,555 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:50:54,556 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:50:54,557 INFO L85 PathProgramCache]: Analyzing trace with hash 719948418, now seen corresponding path program 1 times [2021-11-23 02:50:54,558 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:50:54,558 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [835760539] [2021-11-23 02:50:54,558 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:50:54,558 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:50:54,596 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:50:54,670 INFO L134 CoverageAnalysis]: Checked inductivity of 65 backedges. 65 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-23 02:50:54,670 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:50:54,671 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [835760539] [2021-11-23 02:50:54,671 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [835760539] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:50:54,671 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:50:54,671 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 02:50:54,671 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [514364057] [2021-11-23 02:50:54,672 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:50:54,673 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 02:50:54,673 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:50:54,673 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 02:50:54,673 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-23 02:50:54,674 INFO L87 Difference]: Start difference. First operand 13159 states and 17062 transitions. Second operand has 4 states, 4 states have (on average 48.0) internal successors, (192), 3 states have internal predecessors, (192), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:50:56,149 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:50:56,149 INFO L93 Difference]: Finished difference Result 28891 states and 37600 transitions. [2021-11-23 02:50:56,149 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 02:50:56,150 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 48.0) internal successors, (192), 3 states have internal predecessors, (192), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 192 [2021-11-23 02:50:56,150 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:50:56,187 INFO L225 Difference]: With dead ends: 28891 [2021-11-23 02:50:56,188 INFO L226 Difference]: Without dead ends: 15733 [2021-11-23 02:50:56,205 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-23 02:50:56,208 INFO L933 BasicCegarLoop]: 99 mSDtfsCounter, 245 mSDsluCounter, 9 mSDsCounter, 0 mSdLazyCounter, 1010 mSolverCounterSat, 174 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 245 SdHoareTripleChecker+Valid, 108 SdHoareTripleChecker+Invalid, 1184 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 174 IncrementalHoareTripleChecker+Valid, 1010 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.3s IncrementalHoareTripleChecker+Time [2021-11-23 02:50:56,209 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [245 Valid, 108 Invalid, 1184 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [174 Valid, 1010 Invalid, 0 Unknown, 0 Unchecked, 1.3s Time] [2021-11-23 02:50:56,229 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15733 states. [2021-11-23 02:50:56,480 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15733 to 12873. [2021-11-23 02:50:56,500 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 12873 states, 12872 states have (on average 1.2967681789931635) internal successors, (16692), 12872 states have internal predecessors, (16692), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:50:56,533 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12873 states to 12873 states and 16692 transitions. [2021-11-23 02:50:56,534 INFO L78 Accepts]: Start accepts. Automaton has 12873 states and 16692 transitions. Word has length 192 [2021-11-23 02:50:56,534 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:50:56,534 INFO L470 AbstractCegarLoop]: Abstraction has 12873 states and 16692 transitions. [2021-11-23 02:50:56,535 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 48.0) internal successors, (192), 3 states have internal predecessors, (192), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:50:56,535 INFO L276 IsEmpty]: Start isEmpty. Operand 12873 states and 16692 transitions. [2021-11-23 02:50:56,558 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 200 [2021-11-23 02:50:56,558 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:50:56,559 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:50:56,559 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2021-11-23 02:50:56,559 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:50:56,560 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:50:56,560 INFO L85 PathProgramCache]: Analyzing trace with hash 181280255, now seen corresponding path program 1 times [2021-11-23 02:50:56,564 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:50:56,565 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [576273888] [2021-11-23 02:50:56,565 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:50:56,565 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:50:56,615 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:50:56,694 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 61 proven. 6 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2021-11-23 02:50:56,694 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:50:56,694 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [576273888] [2021-11-23 02:50:56,695 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [576273888] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:50:56,695 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [115420628] [2021-11-23 02:50:56,695 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:50:56,696 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:50:56,696 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5eea9fcf-171d-4af2-a26f-e65bc7515707/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:50:56,698 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5eea9fcf-171d-4af2-a26f-e65bc7515707/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:50:56,720 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5eea9fcf-171d-4af2-a26f-e65bc7515707/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-23 02:50:56,877 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:50:56,881 INFO L263 TraceCheckSpWp]: Trace formula consists of 438 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-23 02:50:56,900 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:50:57,391 INFO L134 CoverageAnalysis]: Checked inductivity of 85 backedges. 55 proven. 0 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2021-11-23 02:50:57,391 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 02:50:57,391 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [115420628] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:50:57,391 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 02:50:57,392 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [3] total 4 [2021-11-23 02:50:57,392 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1049511262] [2021-11-23 02:50:57,392 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:50:57,393 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 02:50:57,393 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:50:57,393 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 02:50:57,393 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-23 02:50:57,393 INFO L87 Difference]: Start difference. First operand 12873 states and 16692 transitions. Second operand has 3 states, 3 states have (on average 59.0) internal successors, (177), 2 states have internal predecessors, (177), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:50:57,887 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:50:57,887 INFO L93 Difference]: Finished difference Result 25316 states and 32821 transitions. [2021-11-23 02:50:57,888 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 02:50:57,888 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 59.0) internal successors, (177), 2 states have internal predecessors, (177), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 199 [2021-11-23 02:50:57,888 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:50:57,915 INFO L225 Difference]: With dead ends: 25316 [2021-11-23 02:50:57,915 INFO L226 Difference]: Without dead ends: 12444 [2021-11-23 02:50:57,929 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 201 GetRequests, 198 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2021-11-23 02:50:57,930 INFO L933 BasicCegarLoop]: 4 mSDtfsCounter, 227 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 265 mSolverCounterSat, 23 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 227 SdHoareTripleChecker+Valid, 4 SdHoareTripleChecker+Invalid, 288 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 23 IncrementalHoareTripleChecker+Valid, 265 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2021-11-23 02:50:57,930 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [227 Valid, 4 Invalid, 288 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [23 Valid, 265 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2021-11-23 02:50:57,944 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12444 states. [2021-11-23 02:50:58,203 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12444 to 12444. [2021-11-23 02:50:58,220 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 12444 states, 12443 states have (on average 1.2540384151731898) internal successors, (15604), 12443 states have internal predecessors, (15604), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:50:58,246 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12444 states to 12444 states and 15604 transitions. [2021-11-23 02:50:58,247 INFO L78 Accepts]: Start accepts. Automaton has 12444 states and 15604 transitions. Word has length 199 [2021-11-23 02:50:58,247 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:50:58,247 INFO L470 AbstractCegarLoop]: Abstraction has 12444 states and 15604 transitions. [2021-11-23 02:50:58,248 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 59.0) internal successors, (177), 2 states have internal predecessors, (177), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:50:58,248 INFO L276 IsEmpty]: Start isEmpty. Operand 12444 states and 15604 transitions. [2021-11-23 02:50:58,264 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 212 [2021-11-23 02:50:58,264 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:50:58,265 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 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] [2021-11-23 02:50:58,304 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5eea9fcf-171d-4af2-a26f-e65bc7515707/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-23 02:50:58,489 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5eea9fcf-171d-4af2-a26f-e65bc7515707/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:50:58,490 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:50:58,490 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:50:58,490 INFO L85 PathProgramCache]: Analyzing trace with hash 921522493, now seen corresponding path program 1 times [2021-11-23 02:50:58,490 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:50:58,490 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1499683214] [2021-11-23 02:50:58,491 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:50:58,491 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:50:58,528 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:50:58,590 INFO L134 CoverageAnalysis]: Checked inductivity of 109 backedges. 73 proven. 6 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2021-11-23 02:50:58,590 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:50:58,590 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1499683214] [2021-11-23 02:50:58,590 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1499683214] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:50:58,590 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1370081528] [2021-11-23 02:50:58,590 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:50:58,591 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:50:58,591 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5eea9fcf-171d-4af2-a26f-e65bc7515707/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:50:58,592 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5eea9fcf-171d-4af2-a26f-e65bc7515707/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:50:58,608 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5eea9fcf-171d-4af2-a26f-e65bc7515707/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-23 02:50:58,747 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:50:58,751 INFO L263 TraceCheckSpWp]: Trace formula consists of 457 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-23 02:50:58,768 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:50:59,195 INFO L134 CoverageAnalysis]: Checked inductivity of 109 backedges. 67 proven. 0 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2021-11-23 02:50:59,196 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 02:50:59,196 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1370081528] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:50:59,196 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 02:50:59,196 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [3] total 5 [2021-11-23 02:50:59,197 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [212325841] [2021-11-23 02:50:59,213 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:50:59,214 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 02:50:59,214 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:50:59,214 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 02:50:59,214 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-23 02:50:59,215 INFO L87 Difference]: Start difference. First operand 12444 states and 15604 transitions. Second operand has 3 states, 3 states have (on average 59.0) internal successors, (177), 3 states have internal predecessors, (177), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:51:00,156 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:51:00,157 INFO L93 Difference]: Finished difference Result 34897 states and 43864 transitions. [2021-11-23 02:51:00,157 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 02:51:00,157 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 59.0) internal successors, (177), 3 states have internal predecessors, (177), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 211 [2021-11-23 02:51:00,158 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:51:00,200 INFO L225 Difference]: With dead ends: 34897 [2021-11-23 02:51:00,200 INFO L226 Difference]: Without dead ends: 22454 [2021-11-23 02:51:00,214 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 213 GetRequests, 210 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2021-11-23 02:51:00,215 INFO L933 BasicCegarLoop]: 73 mSDtfsCounter, 32 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 514 mSolverCounterSat, 47 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 32 SdHoareTripleChecker+Valid, 77 SdHoareTripleChecker+Invalid, 561 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 47 IncrementalHoareTripleChecker+Valid, 514 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2021-11-23 02:51:00,215 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [32 Valid, 77 Invalid, 561 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [47 Valid, 514 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2021-11-23 02:51:00,235 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22454 states. [2021-11-23 02:51:00,575 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22454 to 22454. [2021-11-23 02:51:00,598 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22454 states, 22453 states have (on average 1.2264730770943748) internal successors, (27538), 22453 states have internal predecessors, (27538), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:51:00,644 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22454 states to 22454 states and 27538 transitions. [2021-11-23 02:51:00,644 INFO L78 Accepts]: Start accepts. Automaton has 22454 states and 27538 transitions. Word has length 211 [2021-11-23 02:51:00,645 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:51:00,645 INFO L470 AbstractCegarLoop]: Abstraction has 22454 states and 27538 transitions. [2021-11-23 02:51:00,645 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 59.0) internal successors, (177), 3 states have internal predecessors, (177), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:51:00,645 INFO L276 IsEmpty]: Start isEmpty. Operand 22454 states and 27538 transitions. [2021-11-23 02:51:00,683 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 230 [2021-11-23 02:51:00,683 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:51:00,685 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:51:00,722 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5eea9fcf-171d-4af2-a26f-e65bc7515707/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-23 02:51:00,907 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5eea9fcf-171d-4af2-a26f-e65bc7515707/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:51:00,907 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:51:00,908 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:51:00,908 INFO L85 PathProgramCache]: Analyzing trace with hash -341947182, now seen corresponding path program 1 times [2021-11-23 02:51:00,908 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:51:00,908 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [213805608] [2021-11-23 02:51:00,908 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:51:00,908 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:51:01,046 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:51:01,174 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 99 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-23 02:51:01,175 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:51:01,175 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [213805608] [2021-11-23 02:51:01,175 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [213805608] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:51:01,175 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:51:01,176 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 02:51:01,176 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1852639423] [2021-11-23 02:51:01,176 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:51:01,177 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 02:51:01,177 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:51:01,177 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 02:51:01,178 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-23 02:51:01,178 INFO L87 Difference]: Start difference. First operand 22454 states and 27538 transitions. Second operand has 4 states, 4 states have (on average 56.0) internal successors, (224), 3 states have internal predecessors, (224), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:51:02,199 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:51:02,200 INFO L93 Difference]: Finished difference Result 48196 states and 59506 transitions. [2021-11-23 02:51:02,200 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 02:51:02,200 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 56.0) internal successors, (224), 3 states have internal predecessors, (224), 0 states have call successors, (0), 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 229 [2021-11-23 02:51:02,201 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:51:02,263 INFO L225 Difference]: With dead ends: 48196 [2021-11-23 02:51:02,263 INFO L226 Difference]: Without dead ends: 23884 [2021-11-23 02:51:02,282 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-23 02:51:02,283 INFO L933 BasicCegarLoop]: 7 mSDtfsCounter, 290 mSDsluCounter, 3 mSDsCounter, 0 mSdLazyCounter, 651 mSolverCounterSat, 135 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 290 SdHoareTripleChecker+Valid, 10 SdHoareTripleChecker+Invalid, 786 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 135 IncrementalHoareTripleChecker+Valid, 651 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2021-11-23 02:51:02,284 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [290 Valid, 10 Invalid, 786 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [135 Valid, 651 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2021-11-23 02:51:02,309 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23884 states. [2021-11-23 02:51:02,751 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23884 to 21453. [2021-11-23 02:51:02,775 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21453 states, 21452 states have (on average 1.1597053887749393) internal successors, (24878), 21452 states have internal predecessors, (24878), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:51:02,839 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21453 states to 21453 states and 24878 transitions. [2021-11-23 02:51:02,839 INFO L78 Accepts]: Start accepts. Automaton has 21453 states and 24878 transitions. Word has length 229 [2021-11-23 02:51:02,839 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:51:02,839 INFO L470 AbstractCegarLoop]: Abstraction has 21453 states and 24878 transitions. [2021-11-23 02:51:02,840 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 56.0) internal successors, (224), 3 states have internal predecessors, (224), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:51:02,840 INFO L276 IsEmpty]: Start isEmpty. Operand 21453 states and 24878 transitions. [2021-11-23 02:51:02,874 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 267 [2021-11-23 02:51:02,874 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:51:02,875 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:51:02,875 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2021-11-23 02:51:02,875 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:51:02,876 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:51:02,876 INFO L85 PathProgramCache]: Analyzing trace with hash 243870456, now seen corresponding path program 1 times [2021-11-23 02:51:02,876 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:51:02,877 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1579497809] [2021-11-23 02:51:02,877 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:51:02,877 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:51:02,930 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:51:03,009 INFO L134 CoverageAnalysis]: Checked inductivity of 165 backedges. 74 proven. 6 refuted. 0 times theorem prover too weak. 85 trivial. 0 not checked. [2021-11-23 02:51:03,009 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:51:03,009 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1579497809] [2021-11-23 02:51:03,009 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1579497809] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:51:03,010 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [467362090] [2021-11-23 02:51:03,010 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:51:03,010 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:51:03,010 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5eea9fcf-171d-4af2-a26f-e65bc7515707/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:51:03,013 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5eea9fcf-171d-4af2-a26f-e65bc7515707/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:51:03,036 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5eea9fcf-171d-4af2-a26f-e65bc7515707/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-23 02:51:03,191 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:51:03,195 INFO L263 TraceCheckSpWp]: Trace formula consists of 524 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 02:51:03,202 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:51:03,908 INFO L134 CoverageAnalysis]: Checked inductivity of 165 backedges. 159 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-23 02:51:03,909 INFO L324 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2021-11-23 02:51:03,909 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [467362090] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:51:03,909 INFO L186 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2021-11-23 02:51:03,909 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [3] total 5 [2021-11-23 02:51:03,910 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1764830260] [2021-11-23 02:51:03,910 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:51:03,911 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 02:51:03,911 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:51:03,911 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 02:51:03,911 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-11-23 02:51:03,912 INFO L87 Difference]: Start difference. First operand 21453 states and 24878 transitions. Second operand has 4 states, 4 states have (on average 65.25) internal successors, (261), 3 states have internal predecessors, (261), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:51:04,948 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:51:04,952 INFO L93 Difference]: Finished difference Result 59638 states and 69411 transitions. [2021-11-23 02:51:04,952 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 02:51:04,952 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 65.25) internal successors, (261), 3 states have internal predecessors, (261), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 266 [2021-11-23 02:51:04,953 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:51:05,049 INFO L225 Difference]: With dead ends: 59638 [2021-11-23 02:51:05,049 INFO L226 Difference]: Without dead ends: 38758 [2021-11-23 02:51:05,060 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 268 GetRequests, 264 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2021-11-23 02:51:05,062 INFO L933 BasicCegarLoop]: 4 mSDtfsCounter, 496 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 425 mSolverCounterSat, 61 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 496 SdHoareTripleChecker+Valid, 8 SdHoareTripleChecker+Invalid, 486 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 61 IncrementalHoareTripleChecker+Valid, 425 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2021-11-23 02:51:05,062 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [496 Valid, 8 Invalid, 486 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [61 Valid, 425 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2021-11-23 02:51:05,101 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38758 states. [2021-11-23 02:51:05,753 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38758 to 38613. [2021-11-23 02:51:05,795 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 38613 states, 38612 states have (on average 1.163576090334611) internal successors, (44928), 38612 states have internal predecessors, (44928), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:51:06,003 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 38613 states to 38613 states and 44928 transitions. [2021-11-23 02:51:06,012 INFO L78 Accepts]: Start accepts. Automaton has 38613 states and 44928 transitions. Word has length 266 [2021-11-23 02:51:06,013 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:51:06,013 INFO L470 AbstractCegarLoop]: Abstraction has 38613 states and 44928 transitions. [2021-11-23 02:51:06,013 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 65.25) internal successors, (261), 3 states have internal predecessors, (261), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:51:06,014 INFO L276 IsEmpty]: Start isEmpty. Operand 38613 states and 44928 transitions. [2021-11-23 02:51:06,033 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 269 [2021-11-23 02:51:06,033 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:51:06,033 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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] [2021-11-23 02:51:06,073 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5eea9fcf-171d-4af2-a26f-e65bc7515707/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-23 02:51:06,261 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5eea9fcf-171d-4af2-a26f-e65bc7515707/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2021-11-23 02:51:06,262 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:51:06,262 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:51:06,262 INFO L85 PathProgramCache]: Analyzing trace with hash -1449557514, now seen corresponding path program 1 times [2021-11-23 02:51:06,262 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:51:06,262 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1046391252] [2021-11-23 02:51:06,262 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:51:06,262 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:51:06,302 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:51:06,394 INFO L134 CoverageAnalysis]: Checked inductivity of 177 backedges. 106 proven. 0 refuted. 0 times theorem prover too weak. 71 trivial. 0 not checked. [2021-11-23 02:51:06,394 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:51:06,394 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1046391252] [2021-11-23 02:51:06,395 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1046391252] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:51:06,396 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:51:06,396 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-23 02:51:06,396 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [600829661] [2021-11-23 02:51:06,396 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:51:06,397 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 02:51:06,397 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:51:06,398 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 02:51:06,398 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 02:51:06,398 INFO L87 Difference]: Start difference. First operand 38613 states and 44928 transitions. Second operand has 3 states, 3 states have (on average 66.0) internal successors, (198), 2 states have internal predecessors, (198), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:51:07,469 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:51:07,469 INFO L93 Difference]: Finished difference Result 90526 states and 105258 transitions. [2021-11-23 02:51:07,470 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 02:51:07,470 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 66.0) internal successors, (198), 2 states have internal predecessors, (198), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 268 [2021-11-23 02:51:07,470 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:51:07,525 INFO L225 Difference]: With dead ends: 90526 [2021-11-23 02:51:07,525 INFO L226 Difference]: Without dead ends: 52200 [2021-11-23 02:51:07,540 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 02:51:07,541 INFO L933 BasicCegarLoop]: 66 mSDtfsCounter, 131 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 464 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 131 SdHoareTripleChecker+Valid, 70 SdHoareTripleChecker+Invalid, 475 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 464 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2021-11-23 02:51:07,541 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [131 Valid, 70 Invalid, 475 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 464 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2021-11-23 02:51:07,581 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 52200 states. [2021-11-23 02:51:08,324 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 52200 to 50053. [2021-11-23 02:51:08,355 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 50053 states, 50052 states have (on average 1.1624310716854471) internal successors, (58182), 50052 states have internal predecessors, (58182), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:51:08,489 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50053 states to 50053 states and 58182 transitions. [2021-11-23 02:51:08,489 INFO L78 Accepts]: Start accepts. Automaton has 50053 states and 58182 transitions. Word has length 268 [2021-11-23 02:51:08,490 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:51:08,490 INFO L470 AbstractCegarLoop]: Abstraction has 50053 states and 58182 transitions. [2021-11-23 02:51:08,490 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 66.0) internal successors, (198), 2 states have internal predecessors, (198), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:51:08,490 INFO L276 IsEmpty]: Start isEmpty. Operand 50053 states and 58182 transitions. [2021-11-23 02:51:08,520 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 272 [2021-11-23 02:51:08,521 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:51:08,521 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:51:08,522 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2021-11-23 02:51:08,523 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:51:08,524 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:51:08,524 INFO L85 PathProgramCache]: Analyzing trace with hash -1192858181, now seen corresponding path program 1 times [2021-11-23 02:51:08,524 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:51:08,529 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [767640385] [2021-11-23 02:51:08,529 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:51:08,529 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:51:08,635 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:51:08,958 INFO L134 CoverageAnalysis]: Checked inductivity of 133 backedges. 127 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2021-11-23 02:51:08,959 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:51:08,959 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [767640385] [2021-11-23 02:51:08,959 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [767640385] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:51:08,959 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:51:08,960 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 02:51:08,960 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [187951183] [2021-11-23 02:51:08,960 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:51:08,961 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 02:51:08,961 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:51:08,961 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 02:51:08,961 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 02:51:08,962 INFO L87 Difference]: Start difference. First operand 50053 states and 58182 transitions. Second operand has 3 states, 3 states have (on average 88.66666666666667) internal successors, (266), 3 states have internal predecessors, (266), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:51:09,894 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:51:09,894 INFO L93 Difference]: Finished difference Result 105253 states and 122571 transitions. [2021-11-23 02:51:09,894 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 02:51:09,895 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 88.66666666666667) internal successors, (266), 3 states have internal predecessors, (266), 0 states have call successors, (0), 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 271 [2021-11-23 02:51:09,895 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:51:10,010 INFO L225 Difference]: With dead ends: 105253 [2021-11-23 02:51:10,010 INFO L226 Difference]: Without dead ends: 55773 [2021-11-23 02:51:10,041 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 02:51:10,042 INFO L933 BasicCegarLoop]: 7 mSDtfsCounter, 9 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 383 mSolverCounterSat, 121 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 9 SdHoareTripleChecker+Valid, 11 SdHoareTripleChecker+Invalid, 504 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 121 IncrementalHoareTripleChecker+Valid, 383 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2021-11-23 02:51:10,042 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [9 Valid, 11 Invalid, 504 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [121 Valid, 383 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2021-11-23 02:51:10,093 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55773 states. [2021-11-23 02:51:10,846 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55773 to 53056. [2021-11-23 02:51:10,882 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 53056 states, 53055 states have (on average 1.1679577796626142) internal successors, (61966), 53055 states have internal predecessors, (61966), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:51:10,979 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 53056 states to 53056 states and 61966 transitions. [2021-11-23 02:51:10,979 INFO L78 Accepts]: Start accepts. Automaton has 53056 states and 61966 transitions. Word has length 271 [2021-11-23 02:51:10,980 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:51:10,980 INFO L470 AbstractCegarLoop]: Abstraction has 53056 states and 61966 transitions. [2021-11-23 02:51:10,980 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 88.66666666666667) internal successors, (266), 3 states have internal predecessors, (266), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:51:10,980 INFO L276 IsEmpty]: Start isEmpty. Operand 53056 states and 61966 transitions. [2021-11-23 02:51:11,008 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 277 [2021-11-23 02:51:11,009 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:51:11,009 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-23 02:51:11,010 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2021-11-23 02:51:11,010 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:51:11,010 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:51:11,011 INFO L85 PathProgramCache]: Analyzing trace with hash 680464215, now seen corresponding path program 1 times [2021-11-23 02:51:11,011 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:51:11,011 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1068749327] [2021-11-23 02:51:11,012 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:51:11,012 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:51:11,078 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:51:11,150 INFO L134 CoverageAnalysis]: Checked inductivity of 220 backedges. 93 proven. 0 refuted. 0 times theorem prover too weak. 127 trivial. 0 not checked. [2021-11-23 02:51:11,151 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:51:11,151 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1068749327] [2021-11-23 02:51:11,151 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1068749327] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:51:11,151 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:51:11,152 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2021-11-23 02:51:11,152 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [936690311] [2021-11-23 02:51:11,152 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:51:11,153 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-23 02:51:11,153 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:51:11,154 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-23 02:51:11,154 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 02:51:11,155 INFO L87 Difference]: Start difference. First operand 53056 states and 61966 transitions. Second operand has 3 states, 3 states have (on average 59.666666666666664) internal successors, (179), 2 states have internal predecessors, (179), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:51:12,287 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:51:12,288 INFO L93 Difference]: Finished difference Result 107541 states and 125441 transitions. [2021-11-23 02:51:12,288 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-23 02:51:12,288 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 59.666666666666664) internal successors, (179), 2 states have internal predecessors, (179), 0 states have call successors, (0), 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 276 [2021-11-23 02:51:12,288 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:51:12,348 INFO L225 Difference]: With dead ends: 107541 [2021-11-23 02:51:12,349 INFO L226 Difference]: Without dead ends: 55058 [2021-11-23 02:51:12,372 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-23 02:51:12,373 INFO L933 BasicCegarLoop]: 69 mSDtfsCounter, 117 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 398 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 117 SdHoareTripleChecker+Valid, 73 SdHoareTripleChecker+Invalid, 399 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 398 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2021-11-23 02:51:12,373 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [117 Valid, 73 Invalid, 399 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 398 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2021-11-23 02:51:12,421 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55058 states. [2021-11-23 02:51:13,372 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55058 to 55058. [2021-11-23 02:51:13,423 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 55058 states, 55057 states have (on average 1.1640663312566977) internal successors, (64090), 55057 states have internal predecessors, (64090), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:51:13,526 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55058 states to 55058 states and 64090 transitions. [2021-11-23 02:51:13,526 INFO L78 Accepts]: Start accepts. Automaton has 55058 states and 64090 transitions. Word has length 276 [2021-11-23 02:51:13,526 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:51:13,527 INFO L470 AbstractCegarLoop]: Abstraction has 55058 states and 64090 transitions. [2021-11-23 02:51:13,527 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 59.666666666666664) internal successors, (179), 2 states have internal predecessors, (179), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:51:13,527 INFO L276 IsEmpty]: Start isEmpty. Operand 55058 states and 64090 transitions. [2021-11-23 02:51:13,565 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 300 [2021-11-23 02:51:13,565 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:51:13,566 INFO L514 BasicCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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] [2021-11-23 02:51:13,566 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2021-11-23 02:51:13,566 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:51:13,566 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:51:13,567 INFO L85 PathProgramCache]: Analyzing trace with hash -49271729, now seen corresponding path program 1 times [2021-11-23 02:51:13,567 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:51:13,567 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [893708308] [2021-11-23 02:51:13,567 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:51:13,567 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:51:13,631 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:51:13,718 INFO L134 CoverageAnalysis]: Checked inductivity of 269 backedges. 198 proven. 0 refuted. 0 times theorem prover too weak. 71 trivial. 0 not checked. [2021-11-23 02:51:13,718 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:51:13,718 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [893708308] [2021-11-23 02:51:13,719 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [893708308] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-23 02:51:13,719 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-23 02:51:13,719 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-23 02:51:13,719 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1485934466] [2021-11-23 02:51:13,720 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-23 02:51:13,720 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-23 02:51:13,721 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-23 02:51:13,721 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-23 02:51:13,721 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-23 02:51:13,722 INFO L87 Difference]: Start difference. First operand 55058 states and 64090 transitions. Second operand has 4 states, 4 states have (on average 57.25) internal successors, (229), 3 states have internal predecessors, (229), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:51:15,046 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-23 02:51:15,046 INFO L93 Difference]: Finished difference Result 98103 states and 114267 transitions. [2021-11-23 02:51:15,046 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-23 02:51:15,046 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 57.25) internal successors, (229), 3 states have internal predecessors, (229), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 299 [2021-11-23 02:51:15,047 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-23 02:51:15,112 INFO L225 Difference]: With dead ends: 98103 [2021-11-23 02:51:15,112 INFO L226 Difference]: Without dead ends: 55344 [2021-11-23 02:51:15,136 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2021-11-23 02:51:15,137 INFO L933 BasicCegarLoop]: 45 mSDtfsCounter, 210 mSDsluCounter, 9 mSDsCounter, 0 mSdLazyCounter, 817 mSolverCounterSat, 75 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 210 SdHoareTripleChecker+Valid, 54 SdHoareTripleChecker+Invalid, 892 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 75 IncrementalHoareTripleChecker+Valid, 817 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2021-11-23 02:51:15,137 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [210 Valid, 54 Invalid, 892 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [75 Valid, 817 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2021-11-23 02:51:15,185 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55344 states. [2021-11-23 02:51:16,081 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55344 to 54486. [2021-11-23 02:51:16,113 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 54486 states, 54485 states have (on average 1.162870514820593) internal successors, (63359), 54485 states have internal predecessors, (63359), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:51:16,191 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 54486 states to 54486 states and 63359 transitions. [2021-11-23 02:51:16,192 INFO L78 Accepts]: Start accepts. Automaton has 54486 states and 63359 transitions. Word has length 299 [2021-11-23 02:51:16,192 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-23 02:51:16,192 INFO L470 AbstractCegarLoop]: Abstraction has 54486 states and 63359 transitions. [2021-11-23 02:51:16,192 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 57.25) internal successors, (229), 3 states have internal predecessors, (229), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2021-11-23 02:51:16,192 INFO L276 IsEmpty]: Start isEmpty. Operand 54486 states and 63359 transitions. [2021-11-23 02:51:16,212 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 307 [2021-11-23 02:51:16,212 INFO L506 BasicCegarLoop]: Found error trace [2021-11-23 02:51:16,213 INFO L514 BasicCegarLoop]: trace histogram [5, 5, 5, 5, 5, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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] [2021-11-23 02:51:16,213 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2021-11-23 02:51:16,213 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-23 02:51:16,214 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-23 02:51:16,214 INFO L85 PathProgramCache]: Analyzing trace with hash -1381460814, now seen corresponding path program 1 times [2021-11-23 02:51:16,214 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-23 02:51:16,215 INFO L333 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1075098377] [2021-11-23 02:51:16,215 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:51:16,215 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-23 02:51:16,258 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:51:16,328 INFO L134 CoverageAnalysis]: Checked inductivity of 296 backedges. 111 proven. 6 refuted. 0 times theorem prover too weak. 179 trivial. 0 not checked. [2021-11-23 02:51:16,329 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-23 02:51:16,329 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1075098377] [2021-11-23 02:51:16,329 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1075098377] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-23 02:51:16,329 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1565611109] [2021-11-23 02:51:16,329 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-23 02:51:16,330 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-23 02:51:16,330 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5eea9fcf-171d-4af2-a26f-e65bc7515707/bin/utaipan-EQgc7hIp5V/z3 [2021-11-23 02:51:16,337 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5eea9fcf-171d-4af2-a26f-e65bc7515707/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-23 02:51:16,355 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_5eea9fcf-171d-4af2-a26f-e65bc7515707/bin/utaipan-EQgc7hIp5V/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-23 02:51:16,501 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-23 02:51:16,504 INFO L263 TraceCheckSpWp]: Trace formula consists of 589 conjuncts, 4 conjunts are in the unsatisfiable core [2021-11-23 02:51:16,508 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-23 02:51:17,099 INFO L134 CoverageAnalysis]: Checked inductivity of 296 backedges. 182 proven. 71 refuted. 0 times theorem prover too weak. 43 trivial. 0 not checked. [2021-11-23 02:51:17,099 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-23 02:51:17,643 INFO L134 CoverageAnalysis]: Checked inductivity of 296 backedges. 182 proven. 71 refuted. 0 times theorem prover too weak. 43 trivial. 0 not checked. [2021-11-23 02:51:17,643 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1565611109] provided 0 perfect and 2 imperfect interpolant sequences [2021-11-23 02:51:17,644 INFO L333 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1022392120] [2021-11-23 02:51:17,681 INFO L159 IcfgInterpreter]: Started Sifa with 145 locations of interest [2021-11-23 02:51:17,682 INFO L166 IcfgInterpreter]: Building call graph [2021-11-23 02:51:17,688 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2021-11-23 02:51:17,696 INFO L176 IcfgInterpreter]: Starting interpretation [2021-11-23 02:51:17,697 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs