./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/systemc/token_ring.06.cil-1.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 63182f13 Calling Ultimate with: /usr/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_777c52c1-1794-4aef-8fda-6b2544081fbf/bin/utaipan-vmNK8stdcF/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_777c52c1-1794-4aef-8fda-6b2544081fbf/bin/utaipan-vmNK8stdcF/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_777c52c1-1794-4aef-8fda-6b2544081fbf/bin/utaipan-vmNK8stdcF/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_777c52c1-1794-4aef-8fda-6b2544081fbf/bin/utaipan-vmNK8stdcF/config/TaipanReach.xml -i ../../sv-benchmarks/c/systemc/token_ring.06.cil-1.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_777c52c1-1794-4aef-8fda-6b2544081fbf/bin/utaipan-vmNK8stdcF/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_777c52c1-1794-4aef-8fda-6b2544081fbf/bin/utaipan-vmNK8stdcF --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 4ff0d99c6257365cafb7459615c8e1194d53bcc0d71dc100705abd4bb2d65c37 --- Real Ultimate output --- This is Ultimate 0.2.1-dev-63182f1 [2021-11-12 23:34:00,405 INFO L177 SettingsManager]: Resetting all preferences to default values... [2021-11-12 23:34:00,408 INFO L181 SettingsManager]: Resetting UltimateCore preferences to default values [2021-11-12 23:34:00,468 INFO L184 SettingsManager]: Ultimate Commandline Interface provides no preferences, ignoring... [2021-11-12 23:34:00,468 INFO L181 SettingsManager]: Resetting Boogie Preprocessor preferences to default values [2021-11-12 23:34:00,473 INFO L181 SettingsManager]: Resetting Boogie Procedure Inliner preferences to default values [2021-11-12 23:34:00,475 INFO L181 SettingsManager]: Resetting Abstract Interpretation preferences to default values [2021-11-12 23:34:00,480 INFO L181 SettingsManager]: Resetting LassoRanker preferences to default values [2021-11-12 23:34:00,483 INFO L181 SettingsManager]: Resetting Reaching Definitions preferences to default values [2021-11-12 23:34:00,489 INFO L181 SettingsManager]: Resetting SyntaxChecker preferences to default values [2021-11-12 23:34:00,490 INFO L181 SettingsManager]: Resetting Sifa preferences to default values [2021-11-12 23:34:00,492 INFO L184 SettingsManager]: Büchi Program Product provides no preferences, ignoring... [2021-11-12 23:34:00,493 INFO L181 SettingsManager]: Resetting LTL2Aut preferences to default values [2021-11-12 23:34:00,496 INFO L181 SettingsManager]: Resetting PEA to Boogie preferences to default values [2021-11-12 23:34:00,498 INFO L181 SettingsManager]: Resetting BlockEncodingV2 preferences to default values [2021-11-12 23:34:00,503 INFO L181 SettingsManager]: Resetting ChcToBoogie preferences to default values [2021-11-12 23:34:00,505 INFO L181 SettingsManager]: Resetting AutomataScriptInterpreter preferences to default values [2021-11-12 23:34:00,506 INFO L181 SettingsManager]: Resetting BuchiAutomizer preferences to default values [2021-11-12 23:34:00,509 INFO L181 SettingsManager]: Resetting CACSL2BoogieTranslator preferences to default values [2021-11-12 23:34:00,522 INFO L181 SettingsManager]: Resetting CodeCheck preferences to default values [2021-11-12 23:34:00,525 INFO L181 SettingsManager]: Resetting InvariantSynthesis preferences to default values [2021-11-12 23:34:00,527 INFO L181 SettingsManager]: Resetting RCFGBuilder preferences to default values [2021-11-12 23:34:00,531 INFO L181 SettingsManager]: Resetting Referee preferences to default values [2021-11-12 23:34:00,532 INFO L181 SettingsManager]: Resetting TraceAbstraction preferences to default values [2021-11-12 23:34:00,542 INFO L184 SettingsManager]: TraceAbstractionConcurrent provides no preferences, ignoring... [2021-11-12 23:34:00,543 INFO L184 SettingsManager]: TraceAbstractionWithAFAs provides no preferences, ignoring... [2021-11-12 23:34:00,544 INFO L181 SettingsManager]: Resetting TreeAutomizer preferences to default values [2021-11-12 23:34:00,546 INFO L181 SettingsManager]: Resetting IcfgToChc preferences to default values [2021-11-12 23:34:00,546 INFO L181 SettingsManager]: Resetting IcfgTransformer preferences to default values [2021-11-12 23:34:00,548 INFO L184 SettingsManager]: ReqToTest provides no preferences, ignoring... [2021-11-12 23:34:00,549 INFO L181 SettingsManager]: Resetting Boogie Printer preferences to default values [2021-11-12 23:34:00,551 INFO L181 SettingsManager]: Resetting ChcSmtPrinter preferences to default values [2021-11-12 23:34:00,553 INFO L181 SettingsManager]: Resetting ReqPrinter preferences to default values [2021-11-12 23:34:00,554 INFO L181 SettingsManager]: Resetting Witness Printer preferences to default values [2021-11-12 23:34:00,556 INFO L184 SettingsManager]: Boogie PL CUP Parser provides no preferences, ignoring... [2021-11-12 23:34:00,556 INFO L181 SettingsManager]: Resetting CDTParser preferences to default values [2021-11-12 23:34:00,557 INFO L184 SettingsManager]: AutomataScriptParser provides no preferences, ignoring... [2021-11-12 23:34:00,557 INFO L184 SettingsManager]: ReqParser provides no preferences, ignoring... [2021-11-12 23:34:00,558 INFO L181 SettingsManager]: Resetting SmtParser preferences to default values [2021-11-12 23:34:00,559 INFO L181 SettingsManager]: Resetting Witness Parser preferences to default values [2021-11-12 23:34:00,560 INFO L188 SettingsManager]: Finished resetting all preferences to default values... [2021-11-12 23:34:00,561 INFO L101 SettingsManager]: Beginning loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_777c52c1-1794-4aef-8fda-6b2544081fbf/bin/utaipan-vmNK8stdcF/config/svcomp-Reach-32bit-Taipan_Default.epf [2021-11-12 23:34:00,612 INFO L113 SettingsManager]: Loading preferences was successful [2021-11-12 23:34:00,612 INFO L115 SettingsManager]: Preferences different from defaults after loading the file: [2021-11-12 23:34:00,613 INFO L136 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2021-11-12 23:34:00,614 INFO L138 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2021-11-12 23:34:00,614 INFO L138 SettingsManager]: * User list type=DISABLED [2021-11-12 23:34:00,614 INFO L136 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2021-11-12 23:34:00,615 INFO L138 SettingsManager]: * Explicit value domain=true [2021-11-12 23:34:00,615 INFO L138 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2021-11-12 23:34:00,615 INFO L138 SettingsManager]: * Octagon Domain=false [2021-11-12 23:34:00,615 INFO L138 SettingsManager]: * Abstract domain=CompoundDomain [2021-11-12 23:34:00,617 INFO L138 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2021-11-12 23:34:00,617 INFO L138 SettingsManager]: * Use the RCFG-of-the-future interface=true [2021-11-12 23:34:00,617 INFO L138 SettingsManager]: * Interval Domain=false [2021-11-12 23:34:00,617 INFO L136 SettingsManager]: Preferences of Sifa differ from their defaults: [2021-11-12 23:34:00,618 INFO L138 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2021-11-12 23:34:00,618 INFO L138 SettingsManager]: * Simplification Technique=SIMPLIFY_QUICK [2021-11-12 23:34:00,619 INFO L136 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2021-11-12 23:34:00,619 INFO L138 SettingsManager]: * sizeof long=4 [2021-11-12 23:34:00,619 INFO L138 SettingsManager]: * Overapproximate operations on floating types=true [2021-11-12 23:34:00,620 INFO L138 SettingsManager]: * sizeof POINTER=4 [2021-11-12 23:34:00,620 INFO L138 SettingsManager]: * Check division by zero=IGNORE [2021-11-12 23:34:00,620 INFO L138 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2021-11-12 23:34:00,620 INFO L138 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2021-11-12 23:34:00,621 INFO L138 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2021-11-12 23:34:00,621 INFO L138 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2021-11-12 23:34:00,621 INFO L138 SettingsManager]: * sizeof long double=12 [2021-11-12 23:34:00,621 INFO L138 SettingsManager]: * Check if freed pointer was valid=false [2021-11-12 23:34:00,622 INFO L138 SettingsManager]: * Use constant arrays=true [2021-11-12 23:34:00,622 INFO L138 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2021-11-12 23:34:00,624 INFO L136 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2021-11-12 23:34:00,624 INFO L138 SettingsManager]: * SMT solver=External_DefaultMode [2021-11-12 23:34:00,624 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-12 23:34:00,625 INFO L136 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2021-11-12 23:34:00,625 INFO L138 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2021-11-12 23:34:00,625 INFO L138 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2021-11-12 23:34:00,625 INFO L138 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2021-11-12 23:34:00,626 INFO L138 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2021-11-12 23:34:00,626 INFO L138 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2021-11-12 23:34:00,626 INFO L138 SettingsManager]: * Trace refinement exception blacklist=NONE [2021-11-12 23:34:00,627 INFO L138 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2021-11-12 23:34:00,627 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_777c52c1-1794-4aef-8fda-6b2544081fbf/bin/utaipan-vmNK8stdcF/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_777c52c1-1794-4aef-8fda-6b2544081fbf/bin/utaipan-vmNK8stdcF Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 4ff0d99c6257365cafb7459615c8e1194d53bcc0d71dc100705abd4bb2d65c37 [2021-11-12 23:34:00,947 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2021-11-12 23:34:00,974 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2021-11-12 23:34:00,978 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2021-11-12 23:34:00,980 INFO L271 PluginConnector]: Initializing CDTParser... [2021-11-12 23:34:00,980 INFO L275 PluginConnector]: CDTParser initialized [2021-11-12 23:34:00,982 INFO L432 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_777c52c1-1794-4aef-8fda-6b2544081fbf/bin/utaipan-vmNK8stdcF/../../sv-benchmarks/c/systemc/token_ring.06.cil-1.c [2021-11-12 23:34:01,058 INFO L220 CDTParser]: Created temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_777c52c1-1794-4aef-8fda-6b2544081fbf/bin/utaipan-vmNK8stdcF/data/a6fbac82c/d9c40522313a439fb52ef483a6cdc514/FLAG1cb45c0af [2021-11-12 23:34:01,680 INFO L306 CDTParser]: Found 1 translation units. [2021-11-12 23:34:01,681 INFO L160 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_777c52c1-1794-4aef-8fda-6b2544081fbf/sv-benchmarks/c/systemc/token_ring.06.cil-1.c [2021-11-12 23:34:01,694 INFO L349 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_777c52c1-1794-4aef-8fda-6b2544081fbf/bin/utaipan-vmNK8stdcF/data/a6fbac82c/d9c40522313a439fb52ef483a6cdc514/FLAG1cb45c0af [2021-11-12 23:34:01,962 INFO L357 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_777c52c1-1794-4aef-8fda-6b2544081fbf/bin/utaipan-vmNK8stdcF/data/a6fbac82c/d9c40522313a439fb52ef483a6cdc514 [2021-11-12 23:34:01,964 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2021-11-12 23:34:01,966 INFO L131 ToolchainWalker]: Walking toolchain with 6 elements. [2021-11-12 23:34:01,972 INFO L113 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2021-11-12 23:34:01,972 INFO L271 PluginConnector]: Initializing CACSL2BoogieTranslator... [2021-11-12 23:34:01,976 INFO L275 PluginConnector]: CACSL2BoogieTranslator initialized [2021-11-12 23:34:01,977 INFO L185 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 12.11 11:34:01" (1/1) ... [2021-11-12 23:34:01,979 INFO L205 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1096f412 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 11:34:01, skipping insertion in model container [2021-11-12 23:34:01,979 INFO L185 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 12.11 11:34:01" (1/1) ... [2021-11-12 23:34:01,988 INFO L145 MainTranslator]: Starting translation in SV-COMP mode [2021-11-12 23:34:02,031 INFO L178 MainTranslator]: Built tables and reachable declarations [2021-11-12 23:34:02,214 WARN L228 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_777c52c1-1794-4aef-8fda-6b2544081fbf/sv-benchmarks/c/systemc/token_ring.06.cil-1.c[671,684] [2021-11-12 23:34:02,326 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-12 23:34:02,336 INFO L203 MainTranslator]: Completed pre-run [2021-11-12 23:34:02,347 WARN L228 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_777c52c1-1794-4aef-8fda-6b2544081fbf/sv-benchmarks/c/systemc/token_ring.06.cil-1.c[671,684] [2021-11-12 23:34:02,412 INFO L206 PostProcessor]: Analyzing one entry point: main [2021-11-12 23:34:02,435 INFO L208 MainTranslator]: Completed translation [2021-11-12 23:34:02,436 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 11:34:02 WrapperNode [2021-11-12 23:34:02,436 INFO L132 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2021-11-12 23:34:02,437 INFO L113 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2021-11-12 23:34:02,437 INFO L271 PluginConnector]: Initializing Boogie Procedure Inliner... [2021-11-12 23:34:02,437 INFO L275 PluginConnector]: Boogie Procedure Inliner initialized [2021-11-12 23:34:02,448 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 11:34:02" (1/1) ... [2021-11-12 23:34:02,459 INFO L185 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 11:34:02" (1/1) ... [2021-11-12 23:34:02,506 INFO L132 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2021-11-12 23:34:02,507 INFO L113 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2021-11-12 23:34:02,507 INFO L271 PluginConnector]: Initializing Boogie Preprocessor... [2021-11-12 23:34:02,507 INFO L275 PluginConnector]: Boogie Preprocessor initialized [2021-11-12 23:34:02,517 INFO L185 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 11:34:02" (1/1) ... [2021-11-12 23:34:02,517 INFO L185 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 11:34:02" (1/1) ... [2021-11-12 23:34:02,522 INFO L185 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 11:34:02" (1/1) ... [2021-11-12 23:34:02,522 INFO L185 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 11:34:02" (1/1) ... [2021-11-12 23:34:02,534 INFO L185 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 11:34:02" (1/1) ... [2021-11-12 23:34:02,547 INFO L185 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 11:34:02" (1/1) ... [2021-11-12 23:34:02,551 INFO L185 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 11:34:02" (1/1) ... [2021-11-12 23:34:02,558 INFO L132 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2021-11-12 23:34:02,559 INFO L113 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2021-11-12 23:34:02,559 INFO L271 PluginConnector]: Initializing RCFGBuilder... [2021-11-12 23:34:02,559 INFO L275 PluginConnector]: RCFGBuilder initialized [2021-11-12 23:34:02,560 INFO L185 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 11:34:02" (1/1) ... [2021-11-12 23:34:02,568 INFO L168 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2021-11-12 23:34:02,597 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_777c52c1-1794-4aef-8fda-6b2544081fbf/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 23:34:02,608 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_777c52c1-1794-4aef-8fda-6b2544081fbf/bin/utaipan-vmNK8stdcF/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2021-11-12 23:34:02,611 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_777c52c1-1794-4aef-8fda-6b2544081fbf/bin/utaipan-vmNK8stdcF/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2021-11-12 23:34:02,657 INFO L130 BoogieDeclarations]: Found specification of procedure error [2021-11-12 23:34:02,657 INFO L138 BoogieDeclarations]: Found implementation of procedure error [2021-11-12 23:34:02,657 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2021-11-12 23:34:02,657 INFO L130 BoogieDeclarations]: Found specification of procedure fire_delta_events [2021-11-12 23:34:02,657 INFO L138 BoogieDeclarations]: Found implementation of procedure fire_delta_events [2021-11-12 23:34:02,658 INFO L130 BoogieDeclarations]: Found specification of procedure activate_threads [2021-11-12 23:34:02,658 INFO L138 BoogieDeclarations]: Found implementation of procedure activate_threads [2021-11-12 23:34:02,658 INFO L130 BoogieDeclarations]: Found specification of procedure immediate_notify [2021-11-12 23:34:02,658 INFO L138 BoogieDeclarations]: Found implementation of procedure immediate_notify [2021-11-12 23:34:02,658 INFO L130 BoogieDeclarations]: Found specification of procedure exists_runnable_thread [2021-11-12 23:34:02,658 INFO L138 BoogieDeclarations]: Found implementation of procedure exists_runnable_thread [2021-11-12 23:34:02,659 INFO L130 BoogieDeclarations]: Found specification of procedure reset_delta_events [2021-11-12 23:34:02,659 INFO L138 BoogieDeclarations]: Found implementation of procedure reset_delta_events [2021-11-12 23:34:02,659 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2021-11-12 23:34:02,659 INFO L130 BoogieDeclarations]: Found specification of procedure update_channels [2021-11-12 23:34:02,659 INFO L138 BoogieDeclarations]: Found implementation of procedure update_channels [2021-11-12 23:34:02,660 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2021-11-12 23:34:02,660 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2021-11-12 23:34:03,726 INFO L294 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2021-11-12 23:34:03,727 INFO L299 CfgBuilder]: Removed 9 assume(true) statements. [2021-11-12 23:34:03,732 INFO L202 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 12.11 11:34:03 BoogieIcfgContainer [2021-11-12 23:34:03,732 INFO L132 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2021-11-12 23:34:03,737 INFO L113 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2021-11-12 23:34:03,737 INFO L271 PluginConnector]: Initializing TraceAbstraction... [2021-11-12 23:34:03,740 INFO L275 PluginConnector]: TraceAbstraction initialized [2021-11-12 23:34:03,741 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 12.11 11:34:01" (1/3) ... [2021-11-12 23:34:03,742 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6f0f829c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 12.11 11:34:03, skipping insertion in model container [2021-11-12 23:34:03,742 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 11:34:02" (2/3) ... [2021-11-12 23:34:03,742 INFO L205 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6f0f829c and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 12.11 11:34:03, skipping insertion in model container [2021-11-12 23:34:03,743 INFO L185 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 12.11 11:34:03" (3/3) ... [2021-11-12 23:34:03,744 INFO L111 eAbstractionObserver]: Analyzing ICFG token_ring.06.cil-1.c [2021-11-12 23:34:03,750 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2021-11-12 23:34:03,750 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2021-11-12 23:34:03,815 INFO L338 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2021-11-12 23:34:03,827 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 [2021-11-12 23:34:03,827 INFO L340 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2021-11-12 23:34:03,866 INFO L276 IsEmpty]: Start isEmpty. Operand has 128 states, 97 states have (on average 1.5463917525773196) internal successors, (150), 101 states have internal predecessors, (150), 22 states have call successors, (22), 7 states have call predecessors, (22), 7 states have return successors, (22), 21 states have call predecessors, (22), 22 states have call successors, (22) [2021-11-12 23:34:03,878 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 50 [2021-11-12 23:34:03,878 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 23:34:03,879 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] [2021-11-12 23:34:03,879 INFO L402 AbstractCegarLoop]: === Iteration 1 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 23:34:03,886 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 23:34:03,886 INFO L85 PathProgramCache]: Analyzing trace with hash -1220428875, now seen corresponding path program 1 times [2021-11-12 23:34:03,897 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 23:34:03,897 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [347059458] [2021-11-12 23:34:03,898 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:34:03,899 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 23:34:04,119 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:34:04,351 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2021-11-12 23:34:04,353 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 23:34:04,353 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [347059458] [2021-11-12 23:34:04,354 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [347059458] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-12 23:34:04,355 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-12 23:34:04,355 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2021-11-12 23:34:04,357 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1917299396] [2021-11-12 23:34:04,358 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-12 23:34:04,364 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-12 23:34:04,365 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 23:34:04,406 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-12 23:34:04,408 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-12 23:34:04,412 INFO L87 Difference]: Start difference. First operand has 128 states, 97 states have (on average 1.5463917525773196) internal successors, (150), 101 states have internal predecessors, (150), 22 states have call successors, (22), 7 states have call predecessors, (22), 7 states have return successors, (22), 21 states have call predecessors, (22), 22 states have call successors, (22) Second operand has 4 states, 4 states have (on average 9.5) internal successors, (38), 4 states have internal predecessors, (38), 2 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2021-11-12 23:34:04,912 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 23:34:04,913 INFO L93 Difference]: Finished difference Result 361 states and 558 transitions. [2021-11-12 23:34:04,914 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-12 23:34:04,916 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 9.5) internal successors, (38), 4 states have internal predecessors, (38), 2 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) Word has length 49 [2021-11-12 23:34:04,916 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 23:34:04,948 INFO L225 Difference]: With dead ends: 361 [2021-11-12 23:34:04,948 INFO L226 Difference]: Without dead ends: 234 [2021-11-12 23:34:04,958 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2021-11-12 23:34:04,962 INFO L933 BasicCegarLoop]: 281 mSDtfsCounter, 322 mSDsluCounter, 263 mSDsCounter, 0 mSdLazyCounter, 212 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 255.06ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 322 SdHoareTripleChecker+Valid, 486 SdHoareTripleChecker+Invalid, 223 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 19.65ms SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 212 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 312.88ms IncrementalHoareTripleChecker+Time [2021-11-12 23:34:04,963 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [322 Valid, 486 Invalid, 223 Unknown, 0 Unchecked, 19.65ms Time], IncrementalHoareTripleChecker [11 Valid, 212 Invalid, 0 Unknown, 0 Unchecked, 312.88ms Time] [2021-11-12 23:34:04,985 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 234 states. [2021-11-12 23:34:05,059 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 234 to 233. [2021-11-12 23:34:05,061 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 233 states, 182 states have (on average 1.4835164835164836) internal successors, (270), 185 states have internal predecessors, (270), 38 states have call successors, (38), 13 states have call predecessors, (38), 12 states have return successors, (36), 35 states have call predecessors, (36), 36 states have call successors, (36) [2021-11-12 23:34:05,064 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 233 states to 233 states and 344 transitions. [2021-11-12 23:34:05,066 INFO L78 Accepts]: Start accepts. Automaton has 233 states and 344 transitions. Word has length 49 [2021-11-12 23:34:05,067 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 23:34:05,067 INFO L470 AbstractCegarLoop]: Abstraction has 233 states and 344 transitions. [2021-11-12 23:34:05,067 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 9.5) internal successors, (38), 4 states have internal predecessors, (38), 2 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (5), 2 states have call predecessors, (5), 2 states have call successors, (5) [2021-11-12 23:34:05,068 INFO L276 IsEmpty]: Start isEmpty. Operand 233 states and 344 transitions. [2021-11-12 23:34:05,074 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2021-11-12 23:34:05,075 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 23:34:05,075 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 23:34:05,076 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2021-11-12 23:34:05,076 INFO L402 AbstractCegarLoop]: === Iteration 2 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 23:34:05,077 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 23:34:05,077 INFO L85 PathProgramCache]: Analyzing trace with hash -705930308, now seen corresponding path program 1 times [2021-11-12 23:34:05,077 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 23:34:05,078 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [295103708] [2021-11-12 23:34:05,078 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:34:05,078 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 23:34:05,116 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:34:05,312 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2021-11-12 23:34:05,312 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 23:34:05,313 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [295103708] [2021-11-12 23:34:05,313 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [295103708] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-12 23:34:05,314 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1093806679] [2021-11-12 23:34:05,314 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:34:05,315 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 23:34:05,315 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_777c52c1-1794-4aef-8fda-6b2544081fbf/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 23:34:05,317 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_777c52c1-1794-4aef-8fda-6b2544081fbf/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-12 23:34:05,338 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_777c52c1-1794-4aef-8fda-6b2544081fbf/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2021-11-12 23:34:05,504 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:34:05,508 INFO L263 TraceCheckSpWp]: Trace formula consists of 597 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-12 23:34:05,521 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 23:34:05,872 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2021-11-12 23:34:05,872 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 23:34:06,102 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2021-11-12 23:34:06,103 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1093806679] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-12 23:34:06,107 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-12 23:34:06,108 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5, 4] total 7 [2021-11-12 23:34:06,111 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [603540443] [2021-11-12 23:34:06,112 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-12 23:34:06,115 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-12 23:34:06,115 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 23:34:06,116 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-12 23:34:06,117 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-11-12 23:34:06,117 INFO L87 Difference]: Start difference. First operand 233 states and 344 transitions. Second operand has 3 states, 3 states have (on average 19.0) internal successors, (57), 2 states have internal predecessors, (57), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-12 23:34:06,256 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 23:34:06,256 INFO L93 Difference]: Finished difference Result 682 states and 1023 transitions. [2021-11-12 23:34:06,263 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-12 23:34:06,264 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 19.0) internal successors, (57), 2 states have internal predecessors, (57), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 94 [2021-11-12 23:34:06,264 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 23:34:06,274 INFO L225 Difference]: With dead ends: 682 [2021-11-12 23:34:06,274 INFO L226 Difference]: Without dead ends: 454 [2021-11-12 23:34:06,278 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 191 GetRequests, 185 SyntacticMatches, 1 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-11-12 23:34:06,279 INFO L933 BasicCegarLoop]: 200 mSDtfsCounter, 162 mSDsluCounter, 169 mSDsCounter, 0 mSdLazyCounter, 70 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 70.51ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 162 SdHoareTripleChecker+Valid, 343 SdHoareTripleChecker+Invalid, 72 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 6.80ms SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 70 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 89.77ms IncrementalHoareTripleChecker+Time [2021-11-12 23:34:06,280 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [162 Valid, 343 Invalid, 72 Unknown, 0 Unchecked, 6.80ms Time], IncrementalHoareTripleChecker [2 Valid, 70 Invalid, 0 Unknown, 0 Unchecked, 89.77ms Time] [2021-11-12 23:34:06,285 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 454 states. [2021-11-12 23:34:06,350 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 454 to 448. [2021-11-12 23:34:06,353 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 448 states, 355 states have (on average 1.4788732394366197) internal successors, (525), 359 states have internal predecessors, (525), 68 states have call successors, (68), 25 states have call predecessors, (68), 24 states have return successors, (66), 64 states have call predecessors, (66), 66 states have call successors, (66) [2021-11-12 23:34:06,361 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 448 states to 448 states and 659 transitions. [2021-11-12 23:34:06,361 INFO L78 Accepts]: Start accepts. Automaton has 448 states and 659 transitions. Word has length 94 [2021-11-12 23:34:06,362 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 23:34:06,362 INFO L470 AbstractCegarLoop]: Abstraction has 448 states and 659 transitions. [2021-11-12 23:34:06,362 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 19.0) internal successors, (57), 2 states have internal predecessors, (57), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-12 23:34:06,363 INFO L276 IsEmpty]: Start isEmpty. Operand 448 states and 659 transitions. [2021-11-12 23:34:06,371 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2021-11-12 23:34:06,372 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 23:34:06,372 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 23:34:06,415 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_777c52c1-1794-4aef-8fda-6b2544081fbf/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2021-11-12 23:34:06,598 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_777c52c1-1794-4aef-8fda-6b2544081fbf/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1 [2021-11-12 23:34:06,598 INFO L402 AbstractCegarLoop]: === Iteration 3 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 23:34:06,599 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 23:34:06,599 INFO L85 PathProgramCache]: Analyzing trace with hash 1354955932, now seen corresponding path program 1 times [2021-11-12 23:34:06,599 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 23:34:06,599 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [229349399] [2021-11-12 23:34:06,599 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:34:06,600 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 23:34:06,675 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:34:06,771 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2021-11-12 23:34:06,772 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 23:34:06,772 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [229349399] [2021-11-12 23:34:06,772 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [229349399] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-12 23:34:06,775 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [771803083] [2021-11-12 23:34:06,776 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:34:06,776 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 23:34:06,776 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_777c52c1-1794-4aef-8fda-6b2544081fbf/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 23:34:06,778 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_777c52c1-1794-4aef-8fda-6b2544081fbf/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-12 23:34:06,806 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_777c52c1-1794-4aef-8fda-6b2544081fbf/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2021-11-12 23:34:06,951 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:34:06,954 INFO L263 TraceCheckSpWp]: Trace formula consists of 591 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-12 23:34:06,961 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 23:34:07,144 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 11 proven. 0 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2021-11-12 23:34:07,144 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 23:34:07,367 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 12 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2021-11-12 23:34:07,367 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [771803083] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-12 23:34:07,367 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-12 23:34:07,368 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5, 4] total 7 [2021-11-12 23:34:07,368 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1759905899] [2021-11-12 23:34:07,368 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-12 23:34:07,369 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-12 23:34:07,369 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 23:34:07,370 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-12 23:34:07,370 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-11-12 23:34:07,370 INFO L87 Difference]: Start difference. First operand 448 states and 659 transitions. Second operand has 3 states, 3 states have (on average 20.0) internal successors, (60), 2 states have internal predecessors, (60), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-12 23:34:07,509 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 23:34:07,509 INFO L93 Difference]: Finished difference Result 1321 states and 1974 transitions. [2021-11-12 23:34:07,510 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-12 23:34:07,511 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 20.0) internal successors, (60), 2 states have internal predecessors, (60), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 94 [2021-11-12 23:34:07,512 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 23:34:07,522 INFO L225 Difference]: With dead ends: 1321 [2021-11-12 23:34:07,522 INFO L226 Difference]: Without dead ends: 878 [2021-11-12 23:34:07,524 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 191 GetRequests, 185 SyntacticMatches, 1 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-11-12 23:34:07,530 INFO L933 BasicCegarLoop]: 167 mSDtfsCounter, 159 mSDsluCounter, 169 mSDsCounter, 0 mSdLazyCounter, 66 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 61.73ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 159 SdHoareTripleChecker+Valid, 310 SdHoareTripleChecker+Invalid, 68 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 2.77ms SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 66 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 77.98ms IncrementalHoareTripleChecker+Time [2021-11-12 23:34:07,531 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [159 Valid, 310 Invalid, 68 Unknown, 0 Unchecked, 2.77ms Time], IncrementalHoareTripleChecker [2 Valid, 66 Invalid, 0 Unknown, 0 Unchecked, 77.98ms Time] [2021-11-12 23:34:07,534 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 878 states. [2021-11-12 23:34:07,615 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 878 to 870. [2021-11-12 23:34:07,617 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 870 states, 695 states have (on average 1.4719424460431654) internal successors, (1023), 701 states have internal predecessors, (1023), 126 states have call successors, (126), 49 states have call predecessors, (126), 48 states have return successors, (124), 120 states have call predecessors, (124), 124 states have call successors, (124) [2021-11-12 23:34:07,627 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 870 states to 870 states and 1273 transitions. [2021-11-12 23:34:07,627 INFO L78 Accepts]: Start accepts. Automaton has 870 states and 1273 transitions. Word has length 94 [2021-11-12 23:34:07,628 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 23:34:07,628 INFO L470 AbstractCegarLoop]: Abstraction has 870 states and 1273 transitions. [2021-11-12 23:34:07,628 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 20.0) internal successors, (60), 2 states have internal predecessors, (60), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-12 23:34:07,629 INFO L276 IsEmpty]: Start isEmpty. Operand 870 states and 1273 transitions. [2021-11-12 23:34:07,633 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2021-11-12 23:34:07,634 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 23:34:07,634 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 23:34:07,672 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_777c52c1-1794-4aef-8fda-6b2544081fbf/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2021-11-12 23:34:07,848 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_777c52c1-1794-4aef-8fda-6b2544081fbf/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 23:34:07,849 INFO L402 AbstractCegarLoop]: === Iteration 4 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 23:34:07,849 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 23:34:07,849 INFO L85 PathProgramCache]: Analyzing trace with hash -268761156, now seen corresponding path program 1 times [2021-11-12 23:34:07,850 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 23:34:07,850 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2067481088] [2021-11-12 23:34:07,850 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:34:07,850 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 23:34:07,880 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:34:07,936 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2021-11-12 23:34:07,936 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 23:34:07,936 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2067481088] [2021-11-12 23:34:07,937 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2067481088] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-12 23:34:07,937 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1940125814] [2021-11-12 23:34:07,937 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:34:07,938 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 23:34:07,938 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_777c52c1-1794-4aef-8fda-6b2544081fbf/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 23:34:07,939 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_777c52c1-1794-4aef-8fda-6b2544081fbf/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-12 23:34:07,945 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_777c52c1-1794-4aef-8fda-6b2544081fbf/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2021-11-12 23:34:08,093 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:34:08,096 INFO L263 TraceCheckSpWp]: Trace formula consists of 585 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-12 23:34:08,101 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 23:34:08,301 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 17 proven. 0 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2021-11-12 23:34:08,302 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 23:34:08,496 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2021-11-12 23:34:08,497 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1940125814] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-12 23:34:08,497 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-12 23:34:08,497 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [5, 4] total 7 [2021-11-12 23:34:08,498 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [497314035] [2021-11-12 23:34:08,498 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-12 23:34:08,499 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-12 23:34:08,499 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 23:34:08,500 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-12 23:34:08,500 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-11-12 23:34:08,500 INFO L87 Difference]: Start difference. First operand 870 states and 1273 transitions. Second operand has 3 states, 3 states have (on average 22.0) internal successors, (66), 2 states have internal predecessors, (66), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-12 23:34:08,677 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 23:34:08,677 INFO L93 Difference]: Finished difference Result 2575 states and 3826 transitions. [2021-11-12 23:34:08,678 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-12 23:34:08,678 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 22.0) internal successors, (66), 2 states have internal predecessors, (66), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) Word has length 94 [2021-11-12 23:34:08,678 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 23:34:08,691 INFO L225 Difference]: With dead ends: 2575 [2021-11-12 23:34:08,691 INFO L226 Difference]: Without dead ends: 1710 [2021-11-12 23:34:08,694 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 191 GetRequests, 185 SyntacticMatches, 1 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=31, Unknown=0, NotChecked=0, Total=42 [2021-11-12 23:34:08,695 INFO L933 BasicCegarLoop]: 167 mSDtfsCounter, 153 mSDsluCounter, 169 mSDsCounter, 0 mSdLazyCounter, 66 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 62.20ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 153 SdHoareTripleChecker+Valid, 310 SdHoareTripleChecker+Invalid, 68 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 3.02ms SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 66 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 77.42ms IncrementalHoareTripleChecker+Time [2021-11-12 23:34:08,695 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [153 Valid, 310 Invalid, 68 Unknown, 0 Unchecked, 3.02ms Time], IncrementalHoareTripleChecker [2 Valid, 66 Invalid, 0 Unknown, 0 Unchecked, 77.42ms Time] [2021-11-12 23:34:08,698 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1710 states. [2021-11-12 23:34:08,784 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1710 to 1698. [2021-11-12 23:34:08,791 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1698 states, 1363 states have (on average 1.4636830520909758) internal successors, (1995), 1373 states have internal predecessors, (1995), 238 states have call successors, (238), 97 states have call predecessors, (238), 96 states have return successors, (236), 228 states have call predecessors, (236), 236 states have call successors, (236) [2021-11-12 23:34:08,806 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1698 states to 1698 states and 2469 transitions. [2021-11-12 23:34:08,807 INFO L78 Accepts]: Start accepts. Automaton has 1698 states and 2469 transitions. Word has length 94 [2021-11-12 23:34:08,807 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 23:34:08,808 INFO L470 AbstractCegarLoop]: Abstraction has 1698 states and 2469 transitions. [2021-11-12 23:34:08,808 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 22.0) internal successors, (66), 2 states have internal predecessors, (66), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (7), 2 states have call predecessors, (7), 2 states have call successors, (7) [2021-11-12 23:34:08,808 INFO L276 IsEmpty]: Start isEmpty. Operand 1698 states and 2469 transitions. [2021-11-12 23:34:08,813 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 95 [2021-11-12 23:34:08,814 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 23:34:08,814 INFO L514 BasicCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 23:34:08,856 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_777c52c1-1794-4aef-8fda-6b2544081fbf/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2021-11-12 23:34:09,036 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_777c52c1-1794-4aef-8fda-6b2544081fbf/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 23:34:09,037 INFO L402 AbstractCegarLoop]: === Iteration 5 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 23:34:09,037 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 23:34:09,037 INFO L85 PathProgramCache]: Analyzing trace with hash 811723484, now seen corresponding path program 1 times [2021-11-12 23:34:09,037 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 23:34:09,038 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1901807550] [2021-11-12 23:34:09,038 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:34:09,038 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 23:34:09,073 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:34:09,135 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2021-11-12 23:34:09,135 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 23:34:09,135 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1901807550] [2021-11-12 23:34:09,135 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1901807550] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-12 23:34:09,136 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-12 23:34:09,136 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-12 23:34:09,136 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1623134377] [2021-11-12 23:34:09,136 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-12 23:34:09,137 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-12 23:34:09,137 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 23:34:09,138 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-12 23:34:09,138 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-12 23:34:09,138 INFO L87 Difference]: Start difference. First operand 1698 states and 2469 transitions. Second operand has 3 states, 3 states have (on average 18.0) internal successors, (54), 3 states have internal predecessors, (54), 3 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) [2021-11-12 23:34:09,320 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 23:34:09,320 INFO L93 Difference]: Finished difference Result 3014 states and 4456 transitions. [2021-11-12 23:34:09,320 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-12 23:34:09,321 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 18.0) internal successors, (54), 3 states have internal predecessors, (54), 3 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) Word has length 94 [2021-11-12 23:34:09,322 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 23:34:09,343 INFO L225 Difference]: With dead ends: 3014 [2021-11-12 23:34:09,343 INFO L226 Difference]: Without dead ends: 2138 [2021-11-12 23:34:09,350 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 [2021-11-12 23:34:09,351 INFO L933 BasicCegarLoop]: 230 mSDtfsCounter, 74 mSDsluCounter, 185 mSDsCounter, 0 mSdLazyCounter, 80 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 56.69ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 74 SdHoareTripleChecker+Valid, 389 SdHoareTripleChecker+Invalid, 80 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 2.23ms SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 80 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 70.08ms IncrementalHoareTripleChecker+Time [2021-11-12 23:34:09,351 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [74 Valid, 389 Invalid, 80 Unknown, 0 Unchecked, 2.23ms Time], IncrementalHoareTripleChecker [0 Valid, 80 Invalid, 0 Unknown, 0 Unchecked, 70.08ms Time] [2021-11-12 23:34:09,356 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 2138 states. [2021-11-12 23:34:09,484 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 2138 to 1982. [2021-11-12 23:34:09,488 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1982 states, 1631 states have (on average 1.5027590435315756) internal successors, (2451), 1641 states have internal predecessors, (2451), 246 states have call successors, (246), 105 states have call predecessors, (246), 104 states have return successors, (244), 236 states have call predecessors, (244), 244 states have call successors, (244) [2021-11-12 23:34:09,503 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1982 states to 1982 states and 2941 transitions. [2021-11-12 23:34:09,504 INFO L78 Accepts]: Start accepts. Automaton has 1982 states and 2941 transitions. Word has length 94 [2021-11-12 23:34:09,504 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 23:34:09,505 INFO L470 AbstractCegarLoop]: Abstraction has 1982 states and 2941 transitions. [2021-11-12 23:34:09,505 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 18.0) internal successors, (54), 3 states have internal predecessors, (54), 3 states have call successors, (9), 2 states have call predecessors, (9), 1 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) [2021-11-12 23:34:09,505 INFO L276 IsEmpty]: Start isEmpty. Operand 1982 states and 2941 transitions. [2021-11-12 23:34:09,513 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 127 [2021-11-12 23:34:09,513 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 23:34:09,514 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, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 23:34:09,514 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2021-11-12 23:34:09,514 INFO L402 AbstractCegarLoop]: === Iteration 6 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 23:34:09,515 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 23:34:09,515 INFO L85 PathProgramCache]: Analyzing trace with hash -1411564701, now seen corresponding path program 1 times [2021-11-12 23:34:09,515 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 23:34:09,515 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1883125049] [2021-11-12 23:34:09,516 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:34:09,516 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 23:34:09,544 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:34:09,588 INFO L134 CoverageAnalysis]: Checked inductivity of 79 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 72 trivial. 0 not checked. [2021-11-12 23:34:09,588 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 23:34:09,588 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1883125049] [2021-11-12 23:34:09,588 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1883125049] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-12 23:34:09,589 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-12 23:34:09,589 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-12 23:34:09,589 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [398664560] [2021-11-12 23:34:09,589 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-12 23:34:09,590 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-12 23:34:09,590 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 23:34:09,590 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-12 23:34:09,591 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-12 23:34:09,591 INFO L87 Difference]: Start difference. First operand 1982 states and 2941 transitions. Second operand has 3 states, 3 states have (on average 20.333333333333332) internal successors, (61), 3 states have internal predecessors, (61), 3 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2021-11-12 23:34:09,854 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 23:34:09,855 INFO L93 Difference]: Finished difference Result 5863 states and 8798 transitions. [2021-11-12 23:34:09,855 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-12 23:34:09,856 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 20.333333333333332) internal successors, (61), 3 states have internal predecessors, (61), 3 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) Word has length 126 [2021-11-12 23:34:09,857 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 23:34:09,884 INFO L225 Difference]: With dead ends: 5863 [2021-11-12 23:34:09,884 INFO L226 Difference]: Without dead ends: 3886 [2021-11-12 23:34:09,892 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 [2021-11-12 23:34:09,893 INFO L933 BasicCegarLoop]: 169 mSDtfsCounter, 151 mSDsluCounter, 169 mSDsCounter, 0 mSdLazyCounter, 64 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 57.66ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 151 SdHoareTripleChecker+Valid, 312 SdHoareTripleChecker+Invalid, 66 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 3.77ms SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 64 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 73.00ms IncrementalHoareTripleChecker+Time [2021-11-12 23:34:09,894 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [151 Valid, 312 Invalid, 66 Unknown, 0 Unchecked, 3.77ms Time], IncrementalHoareTripleChecker [2 Valid, 64 Invalid, 0 Unknown, 0 Unchecked, 73.00ms Time] [2021-11-12 23:34:09,899 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3886 states. [2021-11-12 23:34:10,113 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3886 to 3858. [2021-11-12 23:34:10,123 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3858 states, 3179 states have (on average 1.4907203523120478) internal successors, (4739), 3197 states have internal predecessors, (4739), 470 states have call successors, (470), 209 states have call predecessors, (470), 208 states have return successors, (468), 452 states have call predecessors, (468), 468 states have call successors, (468) [2021-11-12 23:34:10,161 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3858 states to 3858 states and 5677 transitions. [2021-11-12 23:34:10,161 INFO L78 Accepts]: Start accepts. Automaton has 3858 states and 5677 transitions. Word has length 126 [2021-11-12 23:34:10,164 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 23:34:10,164 INFO L470 AbstractCegarLoop]: Abstraction has 3858 states and 5677 transitions. [2021-11-12 23:34:10,165 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 20.333333333333332) internal successors, (61), 3 states have internal predecessors, (61), 3 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2021-11-12 23:34:10,165 INFO L276 IsEmpty]: Start isEmpty. Operand 3858 states and 5677 transitions. [2021-11-12 23:34:10,179 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 127 [2021-11-12 23:34:10,179 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 23:34:10,180 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, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 23:34:10,180 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2021-11-12 23:34:10,181 INFO L402 AbstractCegarLoop]: === Iteration 7 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 23:34:10,181 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 23:34:10,181 INFO L85 PathProgramCache]: Analyzing trace with hash 693628423, now seen corresponding path program 1 times [2021-11-12 23:34:10,182 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 23:34:10,182 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1592901138] [2021-11-12 23:34:10,182 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:34:10,182 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 23:34:10,223 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:34:10,275 INFO L134 CoverageAnalysis]: Checked inductivity of 79 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 72 trivial. 0 not checked. [2021-11-12 23:34:10,275 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 23:34:10,275 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1592901138] [2021-11-12 23:34:10,275 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1592901138] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-12 23:34:10,276 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-12 23:34:10,276 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-12 23:34:10,276 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1286931635] [2021-11-12 23:34:10,276 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-12 23:34:10,277 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-12 23:34:10,277 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 23:34:10,277 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-12 23:34:10,278 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-12 23:34:10,278 INFO L87 Difference]: Start difference. First operand 3858 states and 5677 transitions. Second operand has 3 states, 3 states have (on average 20.333333333333332) internal successors, (61), 3 states have internal predecessors, (61), 3 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2021-11-12 23:34:10,711 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 23:34:10,711 INFO L93 Difference]: Finished difference Result 11419 states and 16982 transitions. [2021-11-12 23:34:10,711 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-12 23:34:10,712 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 20.333333333333332) internal successors, (61), 3 states have internal predecessors, (61), 3 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) Word has length 126 [2021-11-12 23:34:10,713 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 23:34:10,777 INFO L225 Difference]: With dead ends: 11419 [2021-11-12 23:34:10,777 INFO L226 Difference]: Without dead ends: 7566 [2021-11-12 23:34:10,793 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 [2021-11-12 23:34:10,794 INFO L933 BasicCegarLoop]: 169 mSDtfsCounter, 153 mSDsluCounter, 169 mSDsCounter, 0 mSdLazyCounter, 64 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 57.82ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 153 SdHoareTripleChecker+Valid, 312 SdHoareTripleChecker+Invalid, 66 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 2.27ms SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 64 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 71.25ms IncrementalHoareTripleChecker+Time [2021-11-12 23:34:10,794 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [153 Valid, 312 Invalid, 66 Unknown, 0 Unchecked, 2.27ms Time], IncrementalHoareTripleChecker [2 Valid, 64 Invalid, 0 Unknown, 0 Unchecked, 71.25ms Time] [2021-11-12 23:34:10,809 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 7566 states. [2021-11-12 23:34:11,259 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 7566 to 7514. [2021-11-12 23:34:11,282 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 7514 states, 6195 states have (on average 1.4778046811945118) internal successors, (9155), 6229 states have internal predecessors, (9155), 902 states have call successors, (902), 417 states have call predecessors, (902), 416 states have return successors, (900), 868 states have call predecessors, (900), 900 states have call successors, (900) [2021-11-12 23:34:11,328 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 7514 states to 7514 states and 10957 transitions. [2021-11-12 23:34:11,330 INFO L78 Accepts]: Start accepts. Automaton has 7514 states and 10957 transitions. Word has length 126 [2021-11-12 23:34:11,331 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 23:34:11,332 INFO L470 AbstractCegarLoop]: Abstraction has 7514 states and 10957 transitions. [2021-11-12 23:34:11,332 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 20.333333333333332) internal successors, (61), 3 states have internal predecessors, (61), 3 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2021-11-12 23:34:11,332 INFO L276 IsEmpty]: Start isEmpty. Operand 7514 states and 10957 transitions. [2021-11-12 23:34:11,368 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 127 [2021-11-12 23:34:11,369 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 23:34:11,369 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, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2021-11-12 23:34:11,369 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6 [2021-11-12 23:34:11,370 INFO L402 AbstractCegarLoop]: === Iteration 8 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 23:34:11,370 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 23:34:11,371 INFO L85 PathProgramCache]: Analyzing trace with hash -1918491796, now seen corresponding path program 1 times [2021-11-12 23:34:11,371 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 23:34:11,371 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1380112227] [2021-11-12 23:34:11,371 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:34:11,372 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 23:34:11,412 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:34:11,468 INFO L134 CoverageAnalysis]: Checked inductivity of 79 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 72 trivial. 0 not checked. [2021-11-12 23:34:11,468 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 23:34:11,468 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1380112227] [2021-11-12 23:34:11,469 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1380112227] provided 1 perfect and 0 imperfect interpolant sequences [2021-11-12 23:34:11,469 INFO L186 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2021-11-12 23:34:11,469 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2021-11-12 23:34:11,469 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1588780981] [2021-11-12 23:34:11,470 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-12 23:34:11,471 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-12 23:34:11,471 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 23:34:11,471 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-12 23:34:11,471 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2021-11-12 23:34:11,472 INFO L87 Difference]: Start difference. First operand 7514 states and 10957 transitions. Second operand has 3 states, 3 states have (on average 20.333333333333332) internal successors, (61), 3 states have internal predecessors, (61), 3 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2021-11-12 23:34:12,232 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 23:34:12,232 INFO L93 Difference]: Finished difference Result 22243 states and 32758 transitions. [2021-11-12 23:34:12,233 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-12 23:34:12,233 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 20.333333333333332) internal successors, (61), 3 states have internal predecessors, (61), 3 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) Word has length 126 [2021-11-12 23:34:12,234 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 23:34:12,377 INFO L225 Difference]: With dead ends: 22243 [2021-11-12 23:34:12,377 INFO L226 Difference]: Without dead ends: 14734 [2021-11-12 23:34:12,417 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 [2021-11-12 23:34:12,418 INFO L933 BasicCegarLoop]: 189 mSDtfsCounter, 156 mSDsluCounter, 169 mSDsCounter, 0 mSdLazyCounter, 65 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 63.51ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 156 SdHoareTripleChecker+Valid, 332 SdHoareTripleChecker+Invalid, 67 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 3.80ms SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 65 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 82.51ms IncrementalHoareTripleChecker+Time [2021-11-12 23:34:12,419 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [156 Valid, 332 Invalid, 67 Unknown, 0 Unchecked, 3.80ms Time], IncrementalHoareTripleChecker [2 Valid, 65 Invalid, 0 Unknown, 0 Unchecked, 82.51ms Time] [2021-11-12 23:34:12,442 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14734 states. [2021-11-12 23:34:13,370 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14734 to 14634. [2021-11-12 23:34:13,407 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 14634 states, 12067 states have (on average 1.4640755780227066) internal successors, (17667), 12133 states have internal predecessors, (17667), 1734 states have call successors, (1734), 833 states have call predecessors, (1734), 832 states have return successors, (1732), 1668 states have call predecessors, (1732), 1732 states have call successors, (1732) [2021-11-12 23:34:13,541 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14634 states to 14634 states and 21133 transitions. [2021-11-12 23:34:13,544 INFO L78 Accepts]: Start accepts. Automaton has 14634 states and 21133 transitions. Word has length 126 [2021-11-12 23:34:13,545 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 23:34:13,545 INFO L470 AbstractCegarLoop]: Abstraction has 14634 states and 21133 transitions. [2021-11-12 23:34:13,546 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 20.333333333333332) internal successors, (61), 3 states have internal predecessors, (61), 3 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2021-11-12 23:34:13,547 INFO L276 IsEmpty]: Start isEmpty. Operand 14634 states and 21133 transitions. [2021-11-12 23:34:13,617 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 146 [2021-11-12 23:34:13,617 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 23:34:13,617 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, 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] [2021-11-12 23:34:13,618 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2021-11-12 23:34:13,618 INFO L402 AbstractCegarLoop]: === Iteration 9 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 23:34:13,618 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 23:34:13,619 INFO L85 PathProgramCache]: Analyzing trace with hash 372815282, now seen corresponding path program 1 times [2021-11-12 23:34:13,619 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 23:34:13,619 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1665312026] [2021-11-12 23:34:13,619 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:34:13,620 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 23:34:13,657 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:34:13,760 INFO L134 CoverageAnalysis]: Checked inductivity of 102 backedges. 10 proven. 45 refuted. 0 times theorem prover too weak. 47 trivial. 0 not checked. [2021-11-12 23:34:13,760 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 23:34:13,760 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1665312026] [2021-11-12 23:34:13,761 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1665312026] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-12 23:34:13,761 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1488196029] [2021-11-12 23:34:13,761 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:34:13,761 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 23:34:13,762 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_777c52c1-1794-4aef-8fda-6b2544081fbf/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 23:34:13,766 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_777c52c1-1794-4aef-8fda-6b2544081fbf/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-12 23:34:13,790 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_777c52c1-1794-4aef-8fda-6b2544081fbf/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2021-11-12 23:34:14,090 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:34:14,094 INFO L263 TraceCheckSpWp]: Trace formula consists of 784 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-12 23:34:14,111 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 23:34:14,478 INFO L134 CoverageAnalysis]: Checked inductivity of 102 backedges. 82 proven. 0 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2021-11-12 23:34:14,478 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 23:34:14,915 INFO L134 CoverageAnalysis]: Checked inductivity of 102 backedges. 44 proven. 20 refuted. 0 times theorem prover too weak. 38 trivial. 0 not checked. [2021-11-12 23:34:14,916 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1488196029] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-12 23:34:14,916 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-12 23:34:14,916 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6, 4] total 8 [2021-11-12 23:34:14,917 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [461013851] [2021-11-12 23:34:14,917 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-12 23:34:14,918 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-12 23:34:14,918 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 23:34:14,918 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-12 23:34:14,919 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2021-11-12 23:34:14,919 INFO L87 Difference]: Start difference. First operand 14634 states and 21133 transitions. Second operand has 3 states, 3 states have (on average 34.666666666666664) internal successors, (104), 3 states have internal predecessors, (104), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2021-11-12 23:34:15,732 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 23:34:15,733 INFO L93 Difference]: Finished difference Result 22210 states and 32627 transitions. [2021-11-12 23:34:15,734 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-12 23:34:15,734 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 34.666666666666664) internal successors, (104), 3 states have internal predecessors, (104), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) Word has length 145 [2021-11-12 23:34:15,735 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 23:34:15,821 INFO L225 Difference]: With dead ends: 22210 [2021-11-12 23:34:15,821 INFO L226 Difference]: Without dead ends: 14702 [2021-11-12 23:34:15,861 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 296 GetRequests, 290 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2021-11-12 23:34:15,865 INFO L933 BasicCegarLoop]: 271 mSDtfsCounter, 148 mSDsluCounter, 173 mSDsCounter, 0 mSdLazyCounter, 88 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 81.10ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 148 SdHoareTripleChecker+Valid, 417 SdHoareTripleChecker+Invalid, 90 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 3.86ms SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 88 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 121.16ms IncrementalHoareTripleChecker+Time [2021-11-12 23:34:15,865 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [148 Valid, 417 Invalid, 90 Unknown, 0 Unchecked, 3.86ms Time], IncrementalHoareTripleChecker [2 Valid, 88 Invalid, 0 Unknown, 0 Unchecked, 121.16ms Time] [2021-11-12 23:34:15,890 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14702 states. [2021-11-12 23:34:16,946 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14702 to 14570. [2021-11-12 23:34:16,969 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 14570 states, 12003 states have (on average 1.4452220278263768) internal successors, (17347), 12069 states have internal predecessors, (17347), 1734 states have call successors, (1734), 833 states have call predecessors, (1734), 832 states have return successors, (1732), 1668 states have call predecessors, (1732), 1732 states have call successors, (1732) [2021-11-12 23:34:17,067 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14570 states to 14570 states and 20813 transitions. [2021-11-12 23:34:17,071 INFO L78 Accepts]: Start accepts. Automaton has 14570 states and 20813 transitions. Word has length 145 [2021-11-12 23:34:17,071 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 23:34:17,071 INFO L470 AbstractCegarLoop]: Abstraction has 14570 states and 20813 transitions. [2021-11-12 23:34:17,072 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 34.666666666666664) internal successors, (104), 3 states have internal predecessors, (104), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2021-11-12 23:34:17,072 INFO L276 IsEmpty]: Start isEmpty. Operand 14570 states and 20813 transitions. [2021-11-12 23:34:17,154 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 146 [2021-11-12 23:34:17,155 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 23:34:17,155 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, 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] [2021-11-12 23:34:17,209 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_777c52c1-1794-4aef-8fda-6b2544081fbf/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2021-11-12 23:34:17,370 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_777c52c1-1794-4aef-8fda-6b2544081fbf/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 23:34:17,370 INFO L402 AbstractCegarLoop]: === Iteration 10 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 23:34:17,371 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 23:34:17,371 INFO L85 PathProgramCache]: Analyzing trace with hash 470512308, now seen corresponding path program 1 times [2021-11-12 23:34:17,371 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 23:34:17,371 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1251016097] [2021-11-12 23:34:17,371 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:34:17,372 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 23:34:17,400 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:34:17,502 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 10 proven. 43 refuted. 0 times theorem prover too weak. 47 trivial. 0 not checked. [2021-11-12 23:34:17,502 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 23:34:17,502 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1251016097] [2021-11-12 23:34:17,502 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1251016097] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-12 23:34:17,503 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [127936540] [2021-11-12 23:34:17,503 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:34:17,503 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 23:34:17,504 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_777c52c1-1794-4aef-8fda-6b2544081fbf/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 23:34:17,505 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_777c52c1-1794-4aef-8fda-6b2544081fbf/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-12 23:34:17,532 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_777c52c1-1794-4aef-8fda-6b2544081fbf/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2021-11-12 23:34:17,737 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:34:17,742 INFO L263 TraceCheckSpWp]: Trace formula consists of 790 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-12 23:34:17,746 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 23:34:18,127 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 71 proven. 0 refuted. 0 times theorem prover too weak. 29 trivial. 0 not checked. [2021-11-12 23:34:18,127 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 23:34:18,466 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 57 proven. 0 refuted. 0 times theorem prover too weak. 43 trivial. 0 not checked. [2021-11-12 23:34:18,466 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [127936540] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-12 23:34:18,466 INFO L186 FreeRefinementEngine]: Found 2 perfect and 1 imperfect interpolant sequences. [2021-11-12 23:34:18,466 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 4] imperfect sequences [6] total 8 [2021-11-12 23:34:18,467 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1232935028] [2021-11-12 23:34:18,467 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-12 23:34:18,468 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-12 23:34:18,468 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 23:34:18,468 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-12 23:34:18,468 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2021-11-12 23:34:18,469 INFO L87 Difference]: Start difference. First operand 14570 states and 20813 transitions. Second operand has 4 states, 4 states have (on average 29.5) internal successors, (118), 4 states have internal predecessors, (118), 3 states have call successors, (13), 3 states have call predecessors, (13), 3 states have return successors, (13), 3 states have call predecessors, (13), 3 states have call successors, (13) [2021-11-12 23:34:19,386 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 23:34:19,387 INFO L93 Difference]: Finished difference Result 25752 states and 36298 transitions. [2021-11-12 23:34:19,387 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-12 23:34:19,388 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 29.5) internal successors, (118), 4 states have internal predecessors, (118), 3 states have call successors, (13), 3 states have call predecessors, (13), 3 states have return successors, (13), 3 states have call predecessors, (13), 3 states have call successors, (13) Word has length 145 [2021-11-12 23:34:19,388 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 23:34:19,480 INFO L225 Difference]: With dead ends: 25752 [2021-11-12 23:34:19,481 INFO L226 Difference]: Without dead ends: 18340 [2021-11-12 23:34:19,522 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 296 GetRequests, 289 SyntacticMatches, 1 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2021-11-12 23:34:19,523 INFO L933 BasicCegarLoop]: 190 mSDtfsCounter, 188 mSDsluCounter, 177 mSDsCounter, 0 mSdLazyCounter, 125 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 127.57ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 188 SdHoareTripleChecker+Valid, 335 SdHoareTripleChecker+Invalid, 130 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 3.54ms SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 125 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 156.56ms IncrementalHoareTripleChecker+Time [2021-11-12 23:34:19,525 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [188 Valid, 335 Invalid, 130 Unknown, 0 Unchecked, 3.54ms Time], IncrementalHoareTripleChecker [5 Valid, 125 Invalid, 0 Unknown, 0 Unchecked, 156.56ms Time] [2021-11-12 23:34:19,554 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18340 states. [2021-11-12 23:34:20,491 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18340 to 18340. [2021-11-12 23:34:20,519 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 18340 states, 15393 states have (on average 1.3970636003378158) internal successors, (21505), 15459 states have internal predecessors, (21505), 1860 states have call successors, (1860), 1087 states have call predecessors, (1860), 1086 states have return successors, (1858), 1794 states have call predecessors, (1858), 1858 states have call successors, (1858) [2021-11-12 23:34:20,617 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18340 states to 18340 states and 25223 transitions. [2021-11-12 23:34:20,620 INFO L78 Accepts]: Start accepts. Automaton has 18340 states and 25223 transitions. Word has length 145 [2021-11-12 23:34:20,621 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 23:34:20,621 INFO L470 AbstractCegarLoop]: Abstraction has 18340 states and 25223 transitions. [2021-11-12 23:34:20,621 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 29.5) internal successors, (118), 4 states have internal predecessors, (118), 3 states have call successors, (13), 3 states have call predecessors, (13), 3 states have return successors, (13), 3 states have call predecessors, (13), 3 states have call successors, (13) [2021-11-12 23:34:20,622 INFO L276 IsEmpty]: Start isEmpty. Operand 18340 states and 25223 transitions. [2021-11-12 23:34:20,679 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 147 [2021-11-12 23:34:20,680 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 23:34:20,680 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, 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] [2021-11-12 23:34:20,726 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_777c52c1-1794-4aef-8fda-6b2544081fbf/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2021-11-12 23:34:20,894 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_777c52c1-1794-4aef-8fda-6b2544081fbf/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 23:34:20,894 INFO L402 AbstractCegarLoop]: === Iteration 11 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 23:34:20,894 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 23:34:20,895 INFO L85 PathProgramCache]: Analyzing trace with hash -973633101, now seen corresponding path program 1 times [2021-11-12 23:34:20,895 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 23:34:20,895 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [445142840] [2021-11-12 23:34:20,895 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:34:20,895 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 23:34:20,934 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:34:21,032 INFO L134 CoverageAnalysis]: Checked inductivity of 101 backedges. 10 proven. 44 refuted. 0 times theorem prover too weak. 47 trivial. 0 not checked. [2021-11-12 23:34:21,032 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 23:34:21,032 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [445142840] [2021-11-12 23:34:21,033 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [445142840] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-12 23:34:21,033 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1847765295] [2021-11-12 23:34:21,033 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:34:21,033 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 23:34:21,034 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_777c52c1-1794-4aef-8fda-6b2544081fbf/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 23:34:21,035 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_777c52c1-1794-4aef-8fda-6b2544081fbf/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-12 23:34:21,054 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_777c52c1-1794-4aef-8fda-6b2544081fbf/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2021-11-12 23:34:21,224 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:34:21,228 INFO L263 TraceCheckSpWp]: Trace formula consists of 789 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-12 23:34:21,233 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 23:34:21,571 INFO L134 CoverageAnalysis]: Checked inductivity of 101 backedges. 96 proven. 0 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2021-11-12 23:34:21,571 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 23:34:21,923 INFO L134 CoverageAnalysis]: Checked inductivity of 101 backedges. 29 proven. 5 refuted. 0 times theorem prover too weak. 67 trivial. 0 not checked. [2021-11-12 23:34:21,924 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1847765295] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-12 23:34:21,924 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-12 23:34:21,924 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6, 4] total 8 [2021-11-12 23:34:21,927 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [255378032] [2021-11-12 23:34:21,927 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-12 23:34:21,928 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-12 23:34:21,928 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 23:34:21,929 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-12 23:34:21,929 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2021-11-12 23:34:21,929 INFO L87 Difference]: Start difference. First operand 18340 states and 25223 transitions. Second operand has 3 states, 3 states have (on average 40.0) internal successors, (120), 3 states have internal predecessors, (120), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2021-11-12 23:34:22,753 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 23:34:22,753 INFO L93 Difference]: Finished difference Result 27804 states and 38925 transitions. [2021-11-12 23:34:22,754 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-12 23:34:22,754 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 40.0) internal successors, (120), 3 states have internal predecessors, (120), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) Word has length 146 [2021-11-12 23:34:22,754 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 23:34:22,835 INFO L225 Difference]: With dead ends: 27804 [2021-11-12 23:34:22,835 INFO L226 Difference]: Without dead ends: 18408 [2021-11-12 23:34:22,862 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 298 GetRequests, 292 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2021-11-12 23:34:22,863 INFO L933 BasicCegarLoop]: 278 mSDtfsCounter, 140 mSDsluCounter, 172 mSDsCounter, 0 mSdLazyCounter, 88 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 68.67ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 140 SdHoareTripleChecker+Valid, 423 SdHoareTripleChecker+Invalid, 90 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 3.24ms SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 88 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 85.48ms IncrementalHoareTripleChecker+Time [2021-11-12 23:34:22,863 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [140 Valid, 423 Invalid, 90 Unknown, 0 Unchecked, 3.24ms Time], IncrementalHoareTripleChecker [2 Valid, 88 Invalid, 0 Unknown, 0 Unchecked, 85.48ms Time] [2021-11-12 23:34:22,884 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18408 states. [2021-11-12 23:34:23,610 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18408 to 18276. [2021-11-12 23:34:23,635 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 18276 states, 15329 states have (on average 1.3778459129754062) internal successors, (21121), 15395 states have internal predecessors, (21121), 1860 states have call successors, (1860), 1087 states have call predecessors, (1860), 1086 states have return successors, (1858), 1794 states have call predecessors, (1858), 1858 states have call successors, (1858) [2021-11-12 23:34:23,716 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18276 states to 18276 states and 24839 transitions. [2021-11-12 23:34:23,719 INFO L78 Accepts]: Start accepts. Automaton has 18276 states and 24839 transitions. Word has length 146 [2021-11-12 23:34:23,719 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 23:34:23,720 INFO L470 AbstractCegarLoop]: Abstraction has 18276 states and 24839 transitions. [2021-11-12 23:34:23,720 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 40.0) internal successors, (120), 3 states have internal predecessors, (120), 3 states have call successors, (12), 3 states have call predecessors, (12), 3 states have return successors, (11), 3 states have call predecessors, (11), 3 states have call successors, (11) [2021-11-12 23:34:23,720 INFO L276 IsEmpty]: Start isEmpty. Operand 18276 states and 24839 transitions. [2021-11-12 23:34:23,763 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 147 [2021-11-12 23:34:23,763 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 23:34:23,764 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, 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] [2021-11-12 23:34:23,807 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_777c52c1-1794-4aef-8fda-6b2544081fbf/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2021-11-12 23:34:23,978 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_777c52c1-1794-4aef-8fda-6b2544081fbf/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2021-11-12 23:34:23,978 INFO L402 AbstractCegarLoop]: === Iteration 12 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 23:34:23,978 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 23:34:23,979 INFO L85 PathProgramCache]: Analyzing trace with hash 1906340051, now seen corresponding path program 1 times [2021-11-12 23:34:23,979 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 23:34:23,979 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [91091149] [2021-11-12 23:34:23,979 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:34:23,979 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 23:34:24,002 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:34:24,075 INFO L134 CoverageAnalysis]: Checked inductivity of 99 backedges. 10 proven. 42 refuted. 0 times theorem prover too weak. 47 trivial. 0 not checked. [2021-11-12 23:34:24,075 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 23:34:24,076 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [91091149] [2021-11-12 23:34:24,076 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [91091149] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-12 23:34:24,076 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1359012693] [2021-11-12 23:34:24,076 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:34:24,077 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 23:34:24,077 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_777c52c1-1794-4aef-8fda-6b2544081fbf/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 23:34:24,078 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_777c52c1-1794-4aef-8fda-6b2544081fbf/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-12 23:34:24,099 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_777c52c1-1794-4aef-8fda-6b2544081fbf/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2021-11-12 23:34:24,399 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:34:24,403 INFO L263 TraceCheckSpWp]: Trace formula consists of 795 conjuncts, 5 conjunts are in the unsatisfiable core [2021-11-12 23:34:24,407 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 23:34:24,682 INFO L134 CoverageAnalysis]: Checked inductivity of 99 backedges. 87 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2021-11-12 23:34:24,683 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 23:34:25,035 INFO L134 CoverageAnalysis]: Checked inductivity of 99 backedges. 37 proven. 19 refuted. 0 times theorem prover too weak. 43 trivial. 0 not checked. [2021-11-12 23:34:25,036 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1359012693] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-12 23:34:25,036 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-12 23:34:25,036 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [6, 4] total 8 [2021-11-12 23:34:25,036 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [129875103] [2021-11-12 23:34:25,037 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-12 23:34:25,038 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-12 23:34:25,038 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 23:34:25,038 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-12 23:34:25,039 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2021-11-12 23:34:25,039 INFO L87 Difference]: Start difference. First operand 18276 states and 24839 transitions. Second operand has 4 states, 4 states have (on average 28.75) internal successors, (115), 4 states have internal predecessors, (115), 2 states have call successors, (11), 2 states have call predecessors, (11), 3 states have return successors, (10), 3 states have call predecessors, (10), 2 states have call successors, (10) [2021-11-12 23:34:26,761 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 23:34:26,762 INFO L93 Difference]: Finished difference Result 55482 states and 75323 transitions. [2021-11-12 23:34:26,762 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2021-11-12 23:34:26,763 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 28.75) internal successors, (115), 4 states have internal predecessors, (115), 2 states have call successors, (11), 2 states have call predecessors, (11), 3 states have return successors, (10), 3 states have call predecessors, (10), 2 states have call successors, (10) Word has length 146 [2021-11-12 23:34:26,763 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 23:34:26,964 INFO L225 Difference]: With dead ends: 55482 [2021-11-12 23:34:26,964 INFO L226 Difference]: Without dead ends: 37212 [2021-11-12 23:34:27,015 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 300 GetRequests, 292 SyntacticMatches, 1 SemanticMatches, 7 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=18, Invalid=54, Unknown=0, NotChecked=0, Total=72 [2021-11-12 23:34:27,017 INFO L933 BasicCegarLoop]: 316 mSDtfsCounter, 176 mSDsluCounter, 511 mSDsCounter, 0 mSdLazyCounter, 154 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 86.23ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 176 SdHoareTripleChecker+Valid, 751 SdHoareTripleChecker+Invalid, 157 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 7.72ms SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 154 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 107.22ms IncrementalHoareTripleChecker+Time [2021-11-12 23:34:27,017 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [176 Valid, 751 Invalid, 157 Unknown, 0 Unchecked, 7.72ms Time], IncrementalHoareTripleChecker [3 Valid, 154 Invalid, 0 Unknown, 0 Unchecked, 107.22ms Time] [2021-11-12 23:34:27,063 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 37212 states. [2021-11-12 23:34:28,927 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 37212 to 37144. [2021-11-12 23:34:28,970 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 37144 states, 31261 states have (on average 1.3674866447010652) internal successors, (42749), 31455 states have internal predecessors, (42749), 3648 states have call successors, (3648), 2171 states have call predecessors, (3648), 2234 states have return successors, (3838), 3518 states have call predecessors, (3838), 3646 states have call successors, (3838) [2021-11-12 23:34:29,247 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 37144 states to 37144 states and 50235 transitions. [2021-11-12 23:34:29,253 INFO L78 Accepts]: Start accepts. Automaton has 37144 states and 50235 transitions. Word has length 146 [2021-11-12 23:34:29,254 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 23:34:29,254 INFO L470 AbstractCegarLoop]: Abstraction has 37144 states and 50235 transitions. [2021-11-12 23:34:29,255 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 28.75) internal successors, (115), 4 states have internal predecessors, (115), 2 states have call successors, (11), 2 states have call predecessors, (11), 3 states have return successors, (10), 3 states have call predecessors, (10), 2 states have call successors, (10) [2021-11-12 23:34:29,255 INFO L276 IsEmpty]: Start isEmpty. Operand 37144 states and 50235 transitions. [2021-11-12 23:34:29,344 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 147 [2021-11-12 23:34:29,345 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 23:34:29,345 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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] [2021-11-12 23:34:29,390 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_777c52c1-1794-4aef-8fda-6b2544081fbf/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2021-11-12 23:34:29,570 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_777c52c1-1794-4aef-8fda-6b2544081fbf/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2021-11-12 23:34:29,570 INFO L402 AbstractCegarLoop]: === Iteration 13 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 23:34:29,570 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 23:34:29,571 INFO L85 PathProgramCache]: Analyzing trace with hash 1880007996, now seen corresponding path program 1 times [2021-11-12 23:34:29,571 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 23:34:29,571 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [611482711] [2021-11-12 23:34:29,571 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:34:29,571 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 23:34:29,594 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:34:29,659 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 10 proven. 43 refuted. 0 times theorem prover too weak. 47 trivial. 0 not checked. [2021-11-12 23:34:29,660 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 23:34:29,660 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [611482711] [2021-11-12 23:34:29,660 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [611482711] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-12 23:34:29,660 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1455064069] [2021-11-12 23:34:29,661 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:34:29,661 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 23:34:29,661 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_777c52c1-1794-4aef-8fda-6b2544081fbf/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 23:34:29,662 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_777c52c1-1794-4aef-8fda-6b2544081fbf/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-12 23:34:29,690 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_777c52c1-1794-4aef-8fda-6b2544081fbf/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2021-11-12 23:34:30,044 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:34:30,048 INFO L263 TraceCheckSpWp]: Trace formula consists of 792 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-12 23:34:30,052 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 23:34:30,354 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 73 proven. 0 refuted. 0 times theorem prover too weak. 27 trivial. 0 not checked. [2021-11-12 23:34:30,355 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 23:34:30,682 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 24 proven. 0 refuted. 0 times theorem prover too weak. 76 trivial. 0 not checked. [2021-11-12 23:34:30,683 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1455064069] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-12 23:34:30,683 INFO L186 FreeRefinementEngine]: Found 2 perfect and 1 imperfect interpolant sequences. [2021-11-12 23:34:30,684 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [6] total 7 [2021-11-12 23:34:30,684 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2025893658] [2021-11-12 23:34:30,684 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-12 23:34:30,685 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-12 23:34:30,685 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 23:34:30,686 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-12 23:34:30,686 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-11-12 23:34:30,686 INFO L87 Difference]: Start difference. First operand 37144 states and 50235 transitions. Second operand has 3 states, 3 states have (on average 36.333333333333336) internal successors, (109), 3 states have internal predecessors, (109), 3 states have call successors, (16), 3 states have call predecessors, (16), 3 states have return successors, (15), 3 states have call predecessors, (15), 3 states have call successors, (15) [2021-11-12 23:34:32,586 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 23:34:32,587 INFO L93 Difference]: Finished difference Result 86628 states and 119008 transitions. [2021-11-12 23:34:32,587 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-12 23:34:32,587 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 36.333333333333336) internal successors, (109), 3 states have internal predecessors, (109), 3 states have call successors, (16), 3 states have call predecessors, (16), 3 states have return successors, (15), 3 states have call predecessors, (15), 3 states have call successors, (15) Word has length 146 [2021-11-12 23:34:32,588 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 23:34:32,877 INFO L225 Difference]: With dead ends: 86628 [2021-11-12 23:34:32,878 INFO L226 Difference]: Without dead ends: 49490 [2021-11-12 23:34:32,968 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 298 GetRequests, 293 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2021-11-12 23:34:32,970 INFO L933 BasicCegarLoop]: 178 mSDtfsCounter, 84 mSDsluCounter, 166 mSDsCounter, 0 mSdLazyCounter, 64 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 62.30ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 84 SdHoareTripleChecker+Valid, 320 SdHoareTripleChecker+Invalid, 66 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 3.16ms SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 64 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 75.20ms IncrementalHoareTripleChecker+Time [2021-11-12 23:34:32,970 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [84 Valid, 320 Invalid, 66 Unknown, 0 Unchecked, 3.16ms Time], IncrementalHoareTripleChecker [2 Valid, 64 Invalid, 0 Unknown, 0 Unchecked, 75.20ms Time] [2021-11-12 23:34:33,028 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 49490 states. [2021-11-12 23:34:35,473 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 49490 to 40932. [2021-11-12 23:34:35,505 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40932 states, 34787 states have (on average 1.394630177940035) internal successors, (48515), 34983 states have internal predecessors, (48515), 3779 states have call successors, (3779), 2302 states have call predecessors, (3779), 2365 states have return successors, (3969), 3647 states have call predecessors, (3969), 3777 states have call successors, (3969) [2021-11-12 23:34:35,653 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40932 states to 40932 states and 56263 transitions. [2021-11-12 23:34:35,663 INFO L78 Accepts]: Start accepts. Automaton has 40932 states and 56263 transitions. Word has length 146 [2021-11-12 23:34:35,663 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 23:34:35,664 INFO L470 AbstractCegarLoop]: Abstraction has 40932 states and 56263 transitions. [2021-11-12 23:34:35,664 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 36.333333333333336) internal successors, (109), 3 states have internal predecessors, (109), 3 states have call successors, (16), 3 states have call predecessors, (16), 3 states have return successors, (15), 3 states have call predecessors, (15), 3 states have call successors, (15) [2021-11-12 23:34:35,664 INFO L276 IsEmpty]: Start isEmpty. Operand 40932 states and 56263 transitions. [2021-11-12 23:34:35,767 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 147 [2021-11-12 23:34:35,768 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 23:34:35,768 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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] [2021-11-12 23:34:35,820 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_777c52c1-1794-4aef-8fda-6b2544081fbf/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2021-11-12 23:34:35,994 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_777c52c1-1794-4aef-8fda-6b2544081fbf/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 23:34:35,994 INFO L402 AbstractCegarLoop]: === Iteration 14 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 23:34:35,994 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 23:34:35,995 INFO L85 PathProgramCache]: Analyzing trace with hash -578540783, now seen corresponding path program 2 times [2021-11-12 23:34:35,995 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 23:34:35,995 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2030419522] [2021-11-12 23:34:35,995 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:34:35,995 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 23:34:36,027 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:34:36,090 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 20 proven. 6 refuted. 0 times theorem prover too weak. 74 trivial. 0 not checked. [2021-11-12 23:34:36,090 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 23:34:36,091 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2030419522] [2021-11-12 23:34:36,091 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2030419522] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-12 23:34:36,091 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [88706461] [2021-11-12 23:34:36,092 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-12 23:34:36,092 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 23:34:36,092 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_777c52c1-1794-4aef-8fda-6b2544081fbf/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 23:34:36,098 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_777c52c1-1794-4aef-8fda-6b2544081fbf/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-12 23:34:36,126 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_777c52c1-1794-4aef-8fda-6b2544081fbf/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2021-11-12 23:34:36,301 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-11-12 23:34:36,301 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-12 23:34:36,306 INFO L263 TraceCheckSpWp]: Trace formula consists of 789 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-12 23:34:36,310 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 23:34:36,594 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 77 proven. 0 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2021-11-12 23:34:36,594 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 23:34:36,863 INFO L134 CoverageAnalysis]: Checked inductivity of 100 backedges. 26 proven. 0 refuted. 0 times theorem prover too weak. 74 trivial. 0 not checked. [2021-11-12 23:34:36,864 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [88706461] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-12 23:34:36,864 INFO L186 FreeRefinementEngine]: Found 2 perfect and 1 imperfect interpolant sequences. [2021-11-12 23:34:36,864 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [5] total 7 [2021-11-12 23:34:36,865 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [233477602] [2021-11-12 23:34:36,865 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-12 23:34:36,866 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-12 23:34:36,866 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 23:34:36,867 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-12 23:34:36,867 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2021-11-12 23:34:36,868 INFO L87 Difference]: Start difference. First operand 40932 states and 56263 transitions. Second operand has 4 states, 4 states have (on average 29.5) internal successors, (118), 4 states have internal predecessors, (118), 4 states have call successors, (15), 3 states have call predecessors, (15), 3 states have return successors, (14), 4 states have call predecessors, (14), 4 states have call successors, (14) [2021-11-12 23:34:39,121 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 23:34:39,121 INFO L93 Difference]: Finished difference Result 82208 states and 113813 transitions. [2021-11-12 23:34:39,122 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2021-11-12 23:34:39,122 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 29.5) internal successors, (118), 4 states have internal predecessors, (118), 4 states have call successors, (15), 3 states have call predecessors, (15), 3 states have return successors, (14), 4 states have call predecessors, (14), 4 states have call successors, (14) Word has length 146 [2021-11-12 23:34:39,122 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 23:34:39,431 INFO L225 Difference]: With dead ends: 82208 [2021-11-12 23:34:39,432 INFO L226 Difference]: Without dead ends: 61468 [2021-11-12 23:34:39,499 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 295 GetRequests, 290 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2021-11-12 23:34:39,500 INFO L933 BasicCegarLoop]: 268 mSDtfsCounter, 266 mSDsluCounter, 224 mSDsCounter, 0 mSdLazyCounter, 93 mSolverCounterSat, 16 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 278.99ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 266 SdHoareTripleChecker+Valid, 461 SdHoareTripleChecker+Invalid, 109 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 7.83ms SdHoareTripleChecker+Time, 16 IncrementalHoareTripleChecker+Valid, 93 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 315.67ms IncrementalHoareTripleChecker+Time [2021-11-12 23:34:39,501 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [266 Valid, 461 Invalid, 109 Unknown, 0 Unchecked, 7.83ms Time], IncrementalHoareTripleChecker [16 Valid, 93 Invalid, 0 Unknown, 0 Unchecked, 315.67ms Time] [2021-11-12 23:34:39,579 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 61468 states. [2021-11-12 23:34:42,017 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 61468 to 48100. [2021-11-12 23:34:42,051 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 48100 states, 41443 states have (on average 1.4331732741355596) internal successors, (59395), 41639 states have internal predecessors, (59395), 4035 states have call successors, (4035), 2558 states have call predecessors, (4035), 2621 states have return successors, (4225), 3903 states have call predecessors, (4225), 4033 states have call successors, (4225) [2021-11-12 23:34:42,197 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48100 states to 48100 states and 67655 transitions. [2021-11-12 23:34:42,206 INFO L78 Accepts]: Start accepts. Automaton has 48100 states and 67655 transitions. Word has length 146 [2021-11-12 23:34:42,206 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 23:34:42,207 INFO L470 AbstractCegarLoop]: Abstraction has 48100 states and 67655 transitions. [2021-11-12 23:34:42,207 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 29.5) internal successors, (118), 4 states have internal predecessors, (118), 4 states have call successors, (15), 3 states have call predecessors, (15), 3 states have return successors, (14), 4 states have call predecessors, (14), 4 states have call successors, (14) [2021-11-12 23:34:42,207 INFO L276 IsEmpty]: Start isEmpty. Operand 48100 states and 67655 transitions. [2021-11-12 23:34:42,369 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 148 [2021-11-12 23:34:42,370 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 23:34:42,370 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, 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] [2021-11-12 23:34:42,411 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_777c52c1-1794-4aef-8fda-6b2544081fbf/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2021-11-12 23:34:42,586 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_777c52c1-1794-4aef-8fda-6b2544081fbf/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 23:34:42,586 INFO L402 AbstractCegarLoop]: === Iteration 15 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 23:34:42,586 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 23:34:42,587 INFO L85 PathProgramCache]: Analyzing trace with hash -1380435120, now seen corresponding path program 1 times [2021-11-12 23:34:42,587 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 23:34:42,587 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1111610529] [2021-11-12 23:34:42,587 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:34:42,588 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 23:34:42,621 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:34:42,701 INFO L134 CoverageAnalysis]: Checked inductivity of 102 backedges. 13 proven. 43 refuted. 0 times theorem prover too weak. 46 trivial. 0 not checked. [2021-11-12 23:34:42,701 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 23:34:42,702 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1111610529] [2021-11-12 23:34:42,702 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1111610529] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-12 23:34:42,702 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [735446979] [2021-11-12 23:34:42,703 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:34:42,703 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 23:34:42,703 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_777c52c1-1794-4aef-8fda-6b2544081fbf/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 23:34:42,704 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_777c52c1-1794-4aef-8fda-6b2544081fbf/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-12 23:34:42,715 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_777c52c1-1794-4aef-8fda-6b2544081fbf/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2021-11-12 23:34:42,923 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:34:42,928 INFO L263 TraceCheckSpWp]: Trace formula consists of 799 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-12 23:34:42,933 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 23:34:43,388 INFO L134 CoverageAnalysis]: Checked inductivity of 102 backedges. 60 proven. 0 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2021-11-12 23:34:43,389 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 23:34:43,930 INFO L134 CoverageAnalysis]: Checked inductivity of 102 backedges. 13 proven. 43 refuted. 0 times theorem prover too weak. 46 trivial. 0 not checked. [2021-11-12 23:34:43,930 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [735446979] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-12 23:34:43,931 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-12 23:34:43,931 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [6, 5] total 8 [2021-11-12 23:34:43,938 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1626851700] [2021-11-12 23:34:43,938 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-12 23:34:43,939 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-12 23:34:43,940 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 23:34:43,940 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-12 23:34:43,940 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=21, Invalid=35, Unknown=0, NotChecked=0, Total=56 [2021-11-12 23:34:43,941 INFO L87 Difference]: Start difference. First operand 48100 states and 67655 transitions. Second operand has 6 states, 6 states have (on average 15.166666666666666) internal successors, (91), 5 states have internal predecessors, (91), 3 states have call successors, (10), 4 states have call predecessors, (10), 4 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2021-11-12 23:34:46,072 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 23:34:46,072 INFO L93 Difference]: Finished difference Result 86364 states and 120904 transitions. [2021-11-12 23:34:46,073 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-12 23:34:46,073 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 15.166666666666666) internal successors, (91), 5 states have internal predecessors, (91), 3 states have call successors, (10), 4 states have call predecessors, (10), 4 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) Word has length 147 [2021-11-12 23:34:46,073 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 23:34:46,219 INFO L225 Difference]: With dead ends: 86364 [2021-11-12 23:34:46,219 INFO L226 Difference]: Without dead ends: 38270 [2021-11-12 23:34:46,319 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 304 GetRequests, 294 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=50, Invalid=82, Unknown=0, NotChecked=0, Total=132 [2021-11-12 23:34:46,321 INFO L933 BasicCegarLoop]: 170 mSDtfsCounter, 543 mSDsluCounter, 277 mSDsCounter, 0 mSdLazyCounter, 167 mSolverCounterSat, 136 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 221.09ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 558 SdHoareTripleChecker+Valid, 400 SdHoareTripleChecker+Invalid, 303 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 6.07ms SdHoareTripleChecker+Time, 136 IncrementalHoareTripleChecker+Valid, 167 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 296.30ms IncrementalHoareTripleChecker+Time [2021-11-12 23:34:46,321 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [558 Valid, 400 Invalid, 303 Unknown, 0 Unchecked, 6.07ms Time], IncrementalHoareTripleChecker [136 Valid, 167 Invalid, 0 Unknown, 0 Unchecked, 296.30ms Time] [2021-11-12 23:34:46,363 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 38270 states. [2021-11-12 23:34:48,103 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 38270 to 36885. [2021-11-12 23:34:48,128 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 36885 states, 31783 states have (on average 1.4269578076330114) internal successors, (45353), 31946 states have internal predecessors, (45353), 3051 states have call successors, (3051), 1923 states have call predecessors, (3051), 2050 states have return successors, (3177), 3016 states have call predecessors, (3177), 3049 states have call successors, (3177) [2021-11-12 23:34:48,233 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36885 states to 36885 states and 51581 transitions. [2021-11-12 23:34:48,240 INFO L78 Accepts]: Start accepts. Automaton has 36885 states and 51581 transitions. Word has length 147 [2021-11-12 23:34:48,241 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 23:34:48,241 INFO L470 AbstractCegarLoop]: Abstraction has 36885 states and 51581 transitions. [2021-11-12 23:34:48,241 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 15.166666666666666) internal successors, (91), 5 states have internal predecessors, (91), 3 states have call successors, (10), 4 states have call predecessors, (10), 4 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2021-11-12 23:34:48,241 INFO L276 IsEmpty]: Start isEmpty. Operand 36885 states and 51581 transitions. [2021-11-12 23:34:48,318 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 149 [2021-11-12 23:34:48,319 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 23:34:48,319 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, 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] [2021-11-12 23:34:48,361 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_777c52c1-1794-4aef-8fda-6b2544081fbf/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2021-11-12 23:34:48,534 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_777c52c1-1794-4aef-8fda-6b2544081fbf/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2021-11-12 23:34:48,534 INFO L402 AbstractCegarLoop]: === Iteration 16 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 23:34:48,534 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 23:34:48,534 INFO L85 PathProgramCache]: Analyzing trace with hash 94549474, now seen corresponding path program 2 times [2021-11-12 23:34:48,535 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 23:34:48,535 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [284348464] [2021-11-12 23:34:48,535 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:34:48,535 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 23:34:48,569 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:34:48,656 INFO L134 CoverageAnalysis]: Checked inductivity of 103 backedges. 14 proven. 43 refuted. 0 times theorem prover too weak. 46 trivial. 0 not checked. [2021-11-12 23:34:48,656 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 23:34:48,656 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [284348464] [2021-11-12 23:34:48,656 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [284348464] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-12 23:34:48,657 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1268671276] [2021-11-12 23:34:48,657 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2021-11-12 23:34:48,657 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 23:34:48,657 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_777c52c1-1794-4aef-8fda-6b2544081fbf/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 23:34:48,658 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_777c52c1-1794-4aef-8fda-6b2544081fbf/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-12 23:34:48,683 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_777c52c1-1794-4aef-8fda-6b2544081fbf/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2021-11-12 23:34:48,866 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2021-11-12 23:34:48,866 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2021-11-12 23:34:48,870 INFO L263 TraceCheckSpWp]: Trace formula consists of 745 conjuncts, 3 conjunts are in the unsatisfiable core [2021-11-12 23:34:48,876 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 23:34:49,161 INFO L134 CoverageAnalysis]: Checked inductivity of 103 backedges. 75 proven. 0 refuted. 0 times theorem prover too weak. 28 trivial. 0 not checked. [2021-11-12 23:34:49,162 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 23:34:49,441 INFO L134 CoverageAnalysis]: Checked inductivity of 103 backedges. 39 proven. 20 refuted. 0 times theorem prover too weak. 44 trivial. 0 not checked. [2021-11-12 23:34:49,441 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1268671276] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-12 23:34:49,441 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-12 23:34:49,442 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [6, 4] total 8 [2021-11-12 23:34:49,442 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [288179786] [2021-11-12 23:34:49,442 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-12 23:34:49,442 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2021-11-12 23:34:49,442 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 23:34:49,443 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2021-11-12 23:34:49,443 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2021-11-12 23:34:49,444 INFO L87 Difference]: Start difference. First operand 36885 states and 51581 transitions. Second operand has 3 states, 3 states have (on average 34.0) internal successors, (102), 3 states have internal predecessors, (102), 3 states have call successors, (11), 3 states have call predecessors, (11), 2 states have return successors, (10), 2 states have call predecessors, (10), 3 states have call successors, (10) [2021-11-12 23:34:50,761 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 23:34:50,761 INFO L93 Difference]: Finished difference Result 49478 states and 69533 transitions. [2021-11-12 23:34:50,761 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2021-11-12 23:34:50,762 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 34.0) internal successors, (102), 3 states have internal predecessors, (102), 3 states have call successors, (11), 3 states have call predecessors, (11), 2 states have return successors, (10), 2 states have call predecessors, (10), 3 states have call successors, (10) Word has length 148 [2021-11-12 23:34:50,762 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 23:34:50,859 INFO L225 Difference]: With dead ends: 49478 [2021-11-12 23:34:50,859 INFO L226 Difference]: Without dead ends: 35317 [2021-11-12 23:34:50,913 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 302 GetRequests, 296 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2021-11-12 23:34:50,914 INFO L933 BasicCegarLoop]: 173 mSDtfsCounter, 40 mSDsluCounter, 174 mSDsCounter, 0 mSdLazyCounter, 69 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 63.14ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 40 SdHoareTripleChecker+Valid, 322 SdHoareTripleChecker+Invalid, 69 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 1.85ms SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 69 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 74.64ms IncrementalHoareTripleChecker+Time [2021-11-12 23:34:50,914 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [40 Valid, 322 Invalid, 69 Unknown, 0 Unchecked, 1.85ms Time], IncrementalHoareTripleChecker [0 Valid, 69 Invalid, 0 Unknown, 0 Unchecked, 74.64ms Time] [2021-11-12 23:34:50,955 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35317 states. [2021-11-12 23:34:52,313 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35317 to 33077. [2021-11-12 23:34:52,340 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 33077 states, 28359 states have (on average 1.4446560174900385) internal successors, (40969), 28426 states have internal predecessors, (40969), 2923 states have call successors, (2923), 1795 states have call predecessors, (2923), 1794 states have return successors, (2921), 2856 states have call predecessors, (2921), 2921 states have call successors, (2921) [2021-11-12 23:34:52,444 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33077 states to 33077 states and 46813 transitions. [2021-11-12 23:34:52,449 INFO L78 Accepts]: Start accepts. Automaton has 33077 states and 46813 transitions. Word has length 148 [2021-11-12 23:34:52,450 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 23:34:52,450 INFO L470 AbstractCegarLoop]: Abstraction has 33077 states and 46813 transitions. [2021-11-12 23:34:52,450 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 34.0) internal successors, (102), 3 states have internal predecessors, (102), 3 states have call successors, (11), 3 states have call predecessors, (11), 2 states have return successors, (10), 2 states have call predecessors, (10), 3 states have call successors, (10) [2021-11-12 23:34:52,450 INFO L276 IsEmpty]: Start isEmpty. Operand 33077 states and 46813 transitions. [2021-11-12 23:34:52,503 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 149 [2021-11-12 23:34:52,503 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 23:34:52,503 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, 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] [2021-11-12 23:34:52,550 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_777c52c1-1794-4aef-8fda-6b2544081fbf/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2021-11-12 23:34:52,718 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_777c52c1-1794-4aef-8fda-6b2544081fbf/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2021-11-12 23:34:52,718 INFO L402 AbstractCegarLoop]: === Iteration 17 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 23:34:52,718 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 23:34:52,719 INFO L85 PathProgramCache]: Analyzing trace with hash -2112387492, now seen corresponding path program 1 times [2021-11-12 23:34:52,719 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 23:34:52,719 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [692836521] [2021-11-12 23:34:52,719 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:34:52,720 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 23:34:52,742 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:34:52,812 INFO L134 CoverageAnalysis]: Checked inductivity of 103 backedges. 15 proven. 43 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2021-11-12 23:34:52,813 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 23:34:52,813 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [692836521] [2021-11-12 23:34:52,813 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [692836521] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-12 23:34:52,813 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [963254423] [2021-11-12 23:34:52,814 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:34:52,814 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 23:34:52,814 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_777c52c1-1794-4aef-8fda-6b2544081fbf/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 23:34:52,815 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_777c52c1-1794-4aef-8fda-6b2544081fbf/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-12 23:34:52,840 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_777c52c1-1794-4aef-8fda-6b2544081fbf/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2021-11-12 23:34:53,017 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:34:53,022 INFO L263 TraceCheckSpWp]: Trace formula consists of 806 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-12 23:34:53,027 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 23:34:53,359 INFO L134 CoverageAnalysis]: Checked inductivity of 103 backedges. 64 proven. 0 refuted. 0 times theorem prover too weak. 39 trivial. 0 not checked. [2021-11-12 23:34:53,359 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 23:34:53,836 INFO L134 CoverageAnalysis]: Checked inductivity of 103 backedges. 17 proven. 43 refuted. 0 times theorem prover too weak. 43 trivial. 0 not checked. [2021-11-12 23:34:53,836 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [963254423] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-12 23:34:53,836 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-12 23:34:53,836 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [6, 5] total 11 [2021-11-12 23:34:53,837 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [620089609] [2021-11-12 23:34:53,837 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-12 23:34:53,837 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-12 23:34:53,837 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 23:34:53,838 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-12 23:34:53,838 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=85, Unknown=0, NotChecked=0, Total=110 [2021-11-12 23:34:53,838 INFO L87 Difference]: Start difference. First operand 33077 states and 46813 transitions. Second operand has 6 states, 6 states have (on average 15.833333333333334) internal successors, (95), 5 states have internal predecessors, (95), 3 states have call successors, (10), 4 states have call predecessors, (10), 4 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2021-11-12 23:34:56,302 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 23:34:56,302 INFO L93 Difference]: Finished difference Result 81721 states and 115583 transitions. [2021-11-12 23:34:56,303 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-12 23:34:56,303 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 15.833333333333334) internal successors, (95), 5 states have internal predecessors, (95), 3 states have call successors, (10), 4 states have call predecessors, (10), 4 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) Word has length 148 [2021-11-12 23:34:56,303 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 23:34:56,440 INFO L225 Difference]: With dead ends: 81721 [2021-11-12 23:34:56,440 INFO L226 Difference]: Without dead ends: 48701 [2021-11-12 23:34:56,490 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 306 GetRequests, 293 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=54, Invalid=156, Unknown=0, NotChecked=0, Total=210 [2021-11-12 23:34:56,490 INFO L933 BasicCegarLoop]: 153 mSDtfsCounter, 567 mSDsluCounter, 248 mSDsCounter, 0 mSdLazyCounter, 162 mSolverCounterSat, 140 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 199.38ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 582 SdHoareTripleChecker+Valid, 358 SdHoareTripleChecker+Invalid, 302 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 8.90ms SdHoareTripleChecker+Time, 140 IncrementalHoareTripleChecker+Valid, 162 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 285.45ms IncrementalHoareTripleChecker+Time [2021-11-12 23:34:56,491 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [582 Valid, 358 Invalid, 302 Unknown, 0 Unchecked, 8.90ms Time], IncrementalHoareTripleChecker [140 Valid, 162 Invalid, 0 Unknown, 0 Unchecked, 285.45ms Time] [2021-11-12 23:34:56,533 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48701 states. [2021-11-12 23:34:58,737 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48701 to 48697. [2021-11-12 23:34:58,774 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 48697 states, 41683 states have (on average 1.4299594558932898) internal successors, (59605), 41782 states have internal predecessors, (59605), 4327 states have call successors, (4327), 2687 states have call predecessors, (4327), 2686 states have return successors, (4325), 4228 states have call predecessors, (4325), 4325 states have call successors, (4325) [2021-11-12 23:34:59,101 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48697 states to 48697 states and 68257 transitions. [2021-11-12 23:34:59,108 INFO L78 Accepts]: Start accepts. Automaton has 48697 states and 68257 transitions. Word has length 148 [2021-11-12 23:34:59,108 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 23:34:59,108 INFO L470 AbstractCegarLoop]: Abstraction has 48697 states and 68257 transitions. [2021-11-12 23:34:59,109 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 15.833333333333334) internal successors, (95), 5 states have internal predecessors, (95), 3 states have call successors, (10), 4 states have call predecessors, (10), 4 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2021-11-12 23:34:59,109 INFO L276 IsEmpty]: Start isEmpty. Operand 48697 states and 68257 transitions. [2021-11-12 23:34:59,211 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 151 [2021-11-12 23:34:59,211 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 23:34:59,212 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, 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] [2021-11-12 23:34:59,239 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_777c52c1-1794-4aef-8fda-6b2544081fbf/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2021-11-12 23:34:59,413 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_777c52c1-1794-4aef-8fda-6b2544081fbf/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2021-11-12 23:34:59,415 INFO L402 AbstractCegarLoop]: === Iteration 18 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 23:34:59,415 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 23:34:59,415 INFO L85 PathProgramCache]: Analyzing trace with hash 2052293462, now seen corresponding path program 1 times [2021-11-12 23:34:59,415 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 23:34:59,415 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1474620623] [2021-11-12 23:34:59,416 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:34:59,416 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 23:34:59,446 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:34:59,516 INFO L134 CoverageAnalysis]: Checked inductivity of 104 backedges. 15 proven. 43 refuted. 0 times theorem prover too weak. 46 trivial. 0 not checked. [2021-11-12 23:34:59,517 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 23:34:59,517 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1474620623] [2021-11-12 23:34:59,518 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1474620623] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-12 23:34:59,518 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1997626831] [2021-11-12 23:34:59,518 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:34:59,518 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 23:34:59,519 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_777c52c1-1794-4aef-8fda-6b2544081fbf/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 23:34:59,526 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_777c52c1-1794-4aef-8fda-6b2544081fbf/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-12 23:34:59,550 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_777c52c1-1794-4aef-8fda-6b2544081fbf/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2021-11-12 23:34:59,728 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:34:59,732 INFO L263 TraceCheckSpWp]: Trace formula consists of 820 conjuncts, 9 conjunts are in the unsatisfiable core [2021-11-12 23:34:59,736 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 23:35:00,069 INFO L134 CoverageAnalysis]: Checked inductivity of 104 backedges. 66 proven. 0 refuted. 0 times theorem prover too weak. 38 trivial. 0 not checked. [2021-11-12 23:35:00,069 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 23:35:00,580 INFO L134 CoverageAnalysis]: Checked inductivity of 104 backedges. 19 proven. 43 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2021-11-12 23:35:00,580 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1997626831] provided 1 perfect and 1 imperfect interpolant sequences [2021-11-12 23:35:00,580 INFO L186 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2021-11-12 23:35:00,581 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [6, 5] total 11 [2021-11-12 23:35:00,581 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [398829273] [2021-11-12 23:35:00,581 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2021-11-12 23:35:00,581 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2021-11-12 23:35:00,582 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 23:35:00,582 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2021-11-12 23:35:00,582 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=25, Invalid=85, Unknown=0, NotChecked=0, Total=110 [2021-11-12 23:35:00,583 INFO L87 Difference]: Start difference. First operand 48697 states and 68257 transitions. Second operand has 6 states, 6 states have (on average 16.333333333333332) internal successors, (98), 5 states have internal predecessors, (98), 3 states have call successors, (10), 4 states have call predecessors, (10), 4 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2021-11-12 23:35:04,040 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2021-11-12 23:35:04,040 INFO L93 Difference]: Finished difference Result 120109 states and 168083 transitions. [2021-11-12 23:35:04,041 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2021-11-12 23:35:04,042 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 16.333333333333332) internal successors, (98), 5 states have internal predecessors, (98), 3 states have call successors, (10), 4 states have call predecessors, (10), 4 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) Word has length 150 [2021-11-12 23:35:04,042 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2021-11-12 23:35:04,246 INFO L225 Difference]: With dead ends: 120109 [2021-11-12 23:35:04,246 INFO L226 Difference]: Without dead ends: 71469 [2021-11-12 23:35:04,316 INFO L932 BasicCegarLoop]: 0 DeclaredPredicates, 310 GetRequests, 297 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=54, Invalid=156, Unknown=0, NotChecked=0, Total=210 [2021-11-12 23:35:04,317 INFO L933 BasicCegarLoop]: 164 mSDtfsCounter, 494 mSDsluCounter, 321 mSDsCounter, 0 mSdLazyCounter, 177 mSolverCounterSat, 140 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 246.24ms Time, 0 mProtectedPredicate, 0 mProtectedAction, 509 SdHoareTripleChecker+Valid, 428 SdHoareTripleChecker+Invalid, 317 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 5.15ms SdHoareTripleChecker+Time, 140 IncrementalHoareTripleChecker+Valid, 177 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 298.63ms IncrementalHoareTripleChecker+Time [2021-11-12 23:35:04,318 INFO L934 BasicCegarLoop]: SdHoareTripleChecker [509 Valid, 428 Invalid, 317 Unknown, 0 Unchecked, 5.15ms Time], IncrementalHoareTripleChecker [140 Valid, 177 Invalid, 0 Unknown, 0 Unchecked, 298.63ms Time] [2021-11-12 23:35:04,375 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71469 states. [2021-11-12 23:35:07,750 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71469 to 71465. [2021-11-12 23:35:07,792 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 71465 states, 61035 states have (on average 1.4125174080445646) internal successors, (86213), 61182 states have internal predecessors, (86213), 6407 states have call successors, (6407), 4023 states have call predecessors, (6407), 4022 states have return successors, (6405), 6260 states have call predecessors, (6405), 6405 states have call successors, (6405) [2021-11-12 23:35:07,974 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71465 states to 71465 states and 99025 transitions. [2021-11-12 23:35:07,979 INFO L78 Accepts]: Start accepts. Automaton has 71465 states and 99025 transitions. Word has length 150 [2021-11-12 23:35:07,980 INFO L84 Accepts]: Finished accepts. word is rejected. [2021-11-12 23:35:07,980 INFO L470 AbstractCegarLoop]: Abstraction has 71465 states and 99025 transitions. [2021-11-12 23:35:07,980 INFO L471 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 16.333333333333332) internal successors, (98), 5 states have internal predecessors, (98), 3 states have call successors, (10), 4 states have call predecessors, (10), 4 states have return successors, (9), 3 states have call predecessors, (9), 3 states have call successors, (9) [2021-11-12 23:35:07,980 INFO L276 IsEmpty]: Start isEmpty. Operand 71465 states and 99025 transitions. [2021-11-12 23:35:08,098 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 149 [2021-11-12 23:35:08,099 INFO L506 BasicCegarLoop]: Found error trace [2021-11-12 23:35:08,099 INFO L514 BasicCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 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] [2021-11-12 23:35:08,125 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_777c52c1-1794-4aef-8fda-6b2544081fbf/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Ended with exit code 0 [2021-11-12 23:35:08,299 WARN L452 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_777c52c1-1794-4aef-8fda-6b2544081fbf/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2021-11-12 23:35:08,300 INFO L402 AbstractCegarLoop]: === Iteration 19 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2021-11-12 23:35:08,300 INFO L144 PredicateUnifier]: Initialized classic predicate unifier [2021-11-12 23:35:08,300 INFO L85 PathProgramCache]: Analyzing trace with hash -564935212, now seen corresponding path program 1 times [2021-11-12 23:35:08,300 INFO L121 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2021-11-12 23:35:08,300 INFO L332 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1214238743] [2021-11-12 23:35:08,300 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:35:08,301 INFO L126 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2021-11-12 23:35:08,324 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:35:08,371 INFO L134 CoverageAnalysis]: Checked inductivity of 101 backedges. 21 proven. 6 refuted. 0 times theorem prover too weak. 74 trivial. 0 not checked. [2021-11-12 23:35:08,371 INFO L139 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2021-11-12 23:35:08,372 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1214238743] [2021-11-12 23:35:08,372 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1214238743] provided 0 perfect and 1 imperfect interpolant sequences [2021-11-12 23:35:08,372 INFO L332 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1061039743] [2021-11-12 23:35:08,372 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2021-11-12 23:35:08,373 INFO L168 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2021-11-12 23:35:08,373 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_777c52c1-1794-4aef-8fda-6b2544081fbf/bin/utaipan-vmNK8stdcF/z3 [2021-11-12 23:35:08,374 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_777c52c1-1794-4aef-8fda-6b2544081fbf/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2021-11-12 23:35:08,398 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_777c52c1-1794-4aef-8fda-6b2544081fbf/bin/utaipan-vmNK8stdcF/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2021-11-12 23:35:08,555 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2021-11-12 23:35:08,559 INFO L263 TraceCheckSpWp]: Trace formula consists of 803 conjuncts, 2 conjunts are in the unsatisfiable core [2021-11-12 23:35:08,563 INFO L286 TraceCheckSpWp]: Computing forward predicates... [2021-11-12 23:35:08,780 INFO L134 CoverageAnalysis]: Checked inductivity of 101 backedges. 78 proven. 0 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2021-11-12 23:35:08,780 INFO L328 TraceCheckSpWp]: Computing backward predicates... [2021-11-12 23:35:09,027 INFO L134 CoverageAnalysis]: Checked inductivity of 101 backedges. 27 proven. 0 refuted. 0 times theorem prover too weak. 74 trivial. 0 not checked. [2021-11-12 23:35:09,028 INFO L160 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1061039743] provided 2 perfect and 0 imperfect interpolant sequences [2021-11-12 23:35:09,028 INFO L186 FreeRefinementEngine]: Found 2 perfect and 1 imperfect interpolant sequences. [2021-11-12 23:35:09,028 INFO L199 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3, 3] imperfect sequences [5] total 7 [2021-11-12 23:35:09,030 INFO L115 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [948927835] [2021-11-12 23:35:09,030 INFO L85 oduleStraightlineAll]: Using 2 perfect interpolants to construct interpolant automaton [2021-11-12 23:35:09,033 INFO L546 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2021-11-12 23:35:09,033 INFO L103 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2021-11-12 23:35:09,034 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2021-11-12 23:35:09,034 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=28, Unknown=0, NotChecked=0, Total=42 [2021-11-12 23:35:09,034 INFO L87 Difference]: Start difference. First operand 71465 states and 99025 transitions. Second operand has 4 states, 4 states have (on average 30.25) internal successors, (121), 4 states have internal predecessors, (121), 4 states have call successors, (15), 3 states have call predecessors, (15), 3 states have return successors, (14), 4 states have call predecessors, (14), 4 states have call successors, (14)