./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/systemc/token_ring.15.cil.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version e7bb482b Calling Ultimate with: /usr/lib/jvm/java-1.11.0-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_494a82a0-2d01-436d-aab0-5aa777b49e4b/bin/utaipan-verify-FOvIYxoinp/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_494a82a0-2d01-436d-aab0-5aa777b49e4b/bin/utaipan-verify-FOvIYxoinp/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_494a82a0-2d01-436d-aab0-5aa777b49e4b/bin/utaipan-verify-FOvIYxoinp/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_494a82a0-2d01-436d-aab0-5aa777b49e4b/bin/utaipan-verify-FOvIYxoinp/config/TaipanReach.xml -i ../../sv-benchmarks/c/systemc/token_ring.15.cil.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_494a82a0-2d01-436d-aab0-5aa777b49e4b/bin/utaipan-verify-FOvIYxoinp/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_494a82a0-2d01-436d-aab0-5aa777b49e4b/bin/utaipan-verify-FOvIYxoinp --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 d827a13f264a8106bf76fcdb72d7bd8ed8c070aef2487e4bd9a858009359b9d5 --- Real Ultimate output --- This is Ultimate 0.2.3-dev-e7bb482 [2023-11-06 21:03:18,828 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-11-06 21:03:18,906 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_494a82a0-2d01-436d-aab0-5aa777b49e4b/bin/utaipan-verify-FOvIYxoinp/config/svcomp-Reach-32bit-Taipan_Default.epf [2023-11-06 21:03:18,912 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-11-06 21:03:18,913 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-11-06 21:03:18,943 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-11-06 21:03:18,944 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-11-06 21:03:18,945 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-11-06 21:03:18,945 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-11-06 21:03:18,946 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-11-06 21:03:18,947 INFO L153 SettingsManager]: * User list type=DISABLED [2023-11-06 21:03:18,947 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-11-06 21:03:18,948 INFO L153 SettingsManager]: * Explicit value domain=true [2023-11-06 21:03:18,948 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-11-06 21:03:18,949 INFO L153 SettingsManager]: * Octagon Domain=false [2023-11-06 21:03:18,950 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-11-06 21:03:18,950 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-11-06 21:03:18,951 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-11-06 21:03:18,951 INFO L153 SettingsManager]: * Interval Domain=false [2023-11-06 21:03:18,952 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-11-06 21:03:18,953 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-11-06 21:03:18,953 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2023-11-06 21:03:18,954 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-11-06 21:03:18,955 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-11-06 21:03:18,955 INFO L153 SettingsManager]: * sizeof long=4 [2023-11-06 21:03:18,956 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-11-06 21:03:18,956 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-11-06 21:03:18,957 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-11-06 21:03:18,958 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-11-06 21:03:18,958 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-11-06 21:03:18,959 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-11-06 21:03:18,959 INFO L153 SettingsManager]: * sizeof long double=12 [2023-11-06 21:03:18,960 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2023-11-06 21:03:18,960 INFO L153 SettingsManager]: * Use constant arrays=true [2023-11-06 21:03:18,961 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-11-06 21:03:18,962 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-11-06 21:03:18,962 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-06 21:03:18,963 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-11-06 21:03:18,963 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-11-06 21:03:18,964 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopsAndPotentialCycles [2023-11-06 21:03:18,964 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-11-06 21:03:18,965 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-11-06 21:03:18,965 INFO L153 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-11-06 21:03:18,966 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-11-06 21:03:18,966 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-11-06 21:03:18,966 INFO L153 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_494a82a0-2d01-436d-aab0-5aa777b49e4b/bin/utaipan-verify-FOvIYxoinp/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_494a82a0-2d01-436d-aab0-5aa777b49e4b/bin/utaipan-verify-FOvIYxoinp Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> d827a13f264a8106bf76fcdb72d7bd8ed8c070aef2487e4bd9a858009359b9d5 [2023-11-06 21:03:19,267 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-11-06 21:03:19,306 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-11-06 21:03:19,309 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-11-06 21:03:19,310 INFO L270 PluginConnector]: Initializing CDTParser... [2023-11-06 21:03:19,311 INFO L274 PluginConnector]: CDTParser initialized [2023-11-06 21:03:19,313 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_494a82a0-2d01-436d-aab0-5aa777b49e4b/bin/utaipan-verify-FOvIYxoinp/../../sv-benchmarks/c/systemc/token_ring.15.cil.c [2023-11-06 21:03:22,466 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-11-06 21:03:22,722 INFO L384 CDTParser]: Found 1 translation units. [2023-11-06 21:03:22,723 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_494a82a0-2d01-436d-aab0-5aa777b49e4b/sv-benchmarks/c/systemc/token_ring.15.cil.c [2023-11-06 21:03:22,744 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_494a82a0-2d01-436d-aab0-5aa777b49e4b/bin/utaipan-verify-FOvIYxoinp/data/46fe5e9f3/63eb546ea9f643e199669a7ed2a37bef/FLAG4532640e9 [2023-11-06 21:03:22,765 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_494a82a0-2d01-436d-aab0-5aa777b49e4b/bin/utaipan-verify-FOvIYxoinp/data/46fe5e9f3/63eb546ea9f643e199669a7ed2a37bef [2023-11-06 21:03:22,773 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-11-06 21:03:22,774 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-11-06 21:03:22,779 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-11-06 21:03:22,779 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-11-06 21:03:22,785 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-11-06 21:03:22,786 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.11 09:03:22" (1/1) ... [2023-11-06 21:03:22,787 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@fef1915 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 09:03:22, skipping insertion in model container [2023-11-06 21:03:22,787 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.11 09:03:22" (1/1) ... [2023-11-06 21:03:22,863 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-11-06 21:03:23,044 WARN L240 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_494a82a0-2d01-436d-aab0-5aa777b49e4b/sv-benchmarks/c/systemc/token_ring.15.cil.c[669,682] [2023-11-06 21:03:23,214 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-06 21:03:23,236 INFO L202 MainTranslator]: Completed pre-run [2023-11-06 21:03:23,246 WARN L240 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_494a82a0-2d01-436d-aab0-5aa777b49e4b/sv-benchmarks/c/systemc/token_ring.15.cil.c[669,682] [2023-11-06 21:03:23,318 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-06 21:03:23,343 INFO L206 MainTranslator]: Completed translation [2023-11-06 21:03:23,343 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 09:03:23 WrapperNode [2023-11-06 21:03:23,343 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-11-06 21:03:23,345 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-11-06 21:03:23,345 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-11-06 21:03:23,345 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-11-06 21:03:23,352 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 09:03:23" (1/1) ... [2023-11-06 21:03:23,369 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 09:03:23" (1/1) ... [2023-11-06 21:03:23,433 INFO L138 Inliner]: procedures = 54, calls = 71, calls flagged for inlining = 37, calls inlined = 37, statements flattened = 943 [2023-11-06 21:03:23,434 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-11-06 21:03:23,434 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-11-06 21:03:23,434 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-11-06 21:03:23,435 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-11-06 21:03:23,455 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 09:03:23" (1/1) ... [2023-11-06 21:03:23,455 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 09:03:23" (1/1) ... [2023-11-06 21:03:23,461 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 09:03:23" (1/1) ... [2023-11-06 21:03:23,461 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 09:03:23" (1/1) ... [2023-11-06 21:03:23,501 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 09:03:23" (1/1) ... [2023-11-06 21:03:23,521 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 09:03:23" (1/1) ... [2023-11-06 21:03:23,544 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 09:03:23" (1/1) ... [2023-11-06 21:03:23,549 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 09:03:23" (1/1) ... [2023-11-06 21:03:23,558 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-11-06 21:03:23,564 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-11-06 21:03:23,565 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-11-06 21:03:23,565 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-11-06 21:03:23,566 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 09:03:23" (1/1) ... [2023-11-06 21:03:23,575 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-06 21:03:23,587 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_494a82a0-2d01-436d-aab0-5aa777b49e4b/bin/utaipan-verify-FOvIYxoinp/z3 [2023-11-06 21:03:23,605 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_494a82a0-2d01-436d-aab0-5aa777b49e4b/bin/utaipan-verify-FOvIYxoinp/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-11-06 21:03:23,643 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-11-06 21:03:23,643 INFO L130 BoogieDeclarations]: Found specification of procedure activate_threads [2023-11-06 21:03:23,644 INFO L138 BoogieDeclarations]: Found implementation of procedure activate_threads [2023-11-06 21:03:23,644 INFO L130 BoogieDeclarations]: Found specification of procedure immediate_notify [2023-11-06 21:03:23,644 INFO L138 BoogieDeclarations]: Found implementation of procedure immediate_notify [2023-11-06 21:03:23,644 INFO L130 BoogieDeclarations]: Found specification of procedure update_channels [2023-11-06 21:03:23,644 INFO L138 BoogieDeclarations]: Found implementation of procedure update_channels [2023-11-06 21:03:23,646 INFO L130 BoogieDeclarations]: Found specification of procedure error [2023-11-06 21:03:23,647 INFO L138 BoogieDeclarations]: Found implementation of procedure error [2023-11-06 21:03:23,647 INFO L130 BoogieDeclarations]: Found specification of procedure fire_delta_events [2023-11-06 21:03:23,647 INFO L138 BoogieDeclarations]: Found implementation of procedure fire_delta_events [2023-11-06 21:03:23,647 INFO L130 BoogieDeclarations]: Found specification of procedure exists_runnable_thread [2023-11-06 21:03:23,647 INFO L138 BoogieDeclarations]: Found implementation of procedure exists_runnable_thread [2023-11-06 21:03:23,647 INFO L130 BoogieDeclarations]: Found specification of procedure reset_delta_events [2023-11-06 21:03:23,648 INFO L138 BoogieDeclarations]: Found implementation of procedure reset_delta_events [2023-11-06 21:03:23,648 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-11-06 21:03:23,648 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-11-06 21:03:23,648 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-11-06 21:03:23,639 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_494a82a0-2d01-436d-aab0-5aa777b49e4b/bin/utaipan-verify-FOvIYxoinp/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-11-06 21:03:23,901 INFO L236 CfgBuilder]: Building ICFG [2023-11-06 21:03:23,903 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2023-11-06 21:03:24,774 INFO L277 CfgBuilder]: Performing block encoding [2023-11-06 21:03:25,439 INFO L297 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-11-06 21:03:25,439 INFO L302 CfgBuilder]: Removed 16 assume(true) statements. [2023-11-06 21:03:25,443 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.11 09:03:25 BoogieIcfgContainer [2023-11-06 21:03:25,444 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-11-06 21:03:25,448 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-11-06 21:03:25,448 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-11-06 21:03:25,451 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-11-06 21:03:25,452 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 06.11 09:03:22" (1/3) ... [2023-11-06 21:03:25,453 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1bb8a173 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.11 09:03:25, skipping insertion in model container [2023-11-06 21:03:25,453 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 09:03:23" (2/3) ... [2023-11-06 21:03:25,455 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@1bb8a173 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.11 09:03:25, skipping insertion in model container [2023-11-06 21:03:25,455 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.11 09:03:25" (3/3) ... [2023-11-06 21:03:25,457 INFO L112 eAbstractionObserver]: Analyzing ICFG token_ring.15.cil.c [2023-11-06 21:03:25,477 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-11-06 21:03:25,477 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-11-06 21:03:25,560 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-11-06 21:03:25,567 INFO L357 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, mPorIndependenceSettings=[Lde.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.partialorder.independence.IndependenceSettings;@7306cf8f, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-11-06 21:03:25,568 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-11-06 21:03:25,574 INFO L276 IsEmpty]: Start isEmpty. Operand has 219 states, 181 states have (on average 1.5248618784530388) internal successors, (276), 185 states have internal predecessors, (276), 29 states have call successors, (29), 7 states have call predecessors, (29), 7 states have return successors, (29), 28 states have call predecessors, (29), 29 states have call successors, (29) [2023-11-06 21:03:25,590 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 71 [2023-11-06 21:03:25,590 INFO L187 NwaCegarLoop]: Found error trace [2023-11-06 21:03:25,591 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-06 21:03:25,592 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-06 21:03:25,601 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 21:03:25,601 INFO L85 PathProgramCache]: Analyzing trace with hash -560234320, now seen corresponding path program 1 times [2023-11-06 21:03:25,611 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-06 21:03:25,612 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [48727399] [2023-11-06 21:03:25,612 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 21:03:25,612 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 21:03:25,881 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 21:03:26,304 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-06 21:03:26,305 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-06 21:03:26,305 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [48727399] [2023-11-06 21:03:26,306 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [48727399] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-06 21:03:26,306 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-06 21:03:26,306 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-11-06 21:03:26,308 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [208666436] [2023-11-06 21:03:26,309 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-06 21:03:26,313 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-11-06 21:03:26,314 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-06 21:03:26,343 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-11-06 21:03:26,344 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-11-06 21:03:26,347 INFO L87 Difference]: Start difference. First operand has 219 states, 181 states have (on average 1.5248618784530388) internal successors, (276), 185 states have internal predecessors, (276), 29 states have call successors, (29), 7 states have call predecessors, (29), 7 states have return successors, (29), 28 states have call predecessors, (29), 29 states have call successors, (29) Second operand has 4 states, 4 states have (on average 14.75) internal successors, (59), 4 states have internal predecessors, (59), 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) [2023-11-06 21:03:26,923 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-06 21:03:26,923 INFO L93 Difference]: Finished difference Result 634 states and 985 transitions. [2023-11-06 21:03:26,925 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-11-06 21:03:26,926 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 14.75) internal successors, (59), 4 states have internal predecessors, (59), 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 70 [2023-11-06 21:03:26,926 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-06 21:03:26,941 INFO L225 Difference]: With dead ends: 634 [2023-11-06 21:03:26,941 INFO L226 Difference]: Without dead ends: 416 [2023-11-06 21:03:26,950 INFO L412 NwaCegarLoop]: 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 [2023-11-06 21:03:26,957 INFO L413 NwaCegarLoop]: 520 mSDtfsCounter, 581 mSDsluCounter, 416 mSDsCounter, 0 mSdLazyCounter, 322 mSolverCounterSat, 11 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 581 SdHoareTripleChecker+Valid, 936 SdHoareTripleChecker+Invalid, 333 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 322 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2023-11-06 21:03:26,959 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [581 Valid, 936 Invalid, 333 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 322 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2023-11-06 21:03:26,979 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 416 states. [2023-11-06 21:03:27,063 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 416 to 415. [2023-11-06 21:03:27,066 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 415 states, 350 states have (on average 1.4914285714285713) internal successors, (522), 353 states have internal predecessors, (522), 52 states have call successors, (52), 13 states have call predecessors, (52), 12 states have return successors, (50), 49 states have call predecessors, (50), 50 states have call successors, (50) [2023-11-06 21:03:27,070 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 415 states to 415 states and 624 transitions. [2023-11-06 21:03:27,071 INFO L78 Accepts]: Start accepts. Automaton has 415 states and 624 transitions. Word has length 70 [2023-11-06 21:03:27,072 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-06 21:03:27,072 INFO L495 AbstractCegarLoop]: Abstraction has 415 states and 624 transitions. [2023-11-06 21:03:27,072 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 14.75) internal successors, (59), 4 states have internal predecessors, (59), 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) [2023-11-06 21:03:27,072 INFO L276 IsEmpty]: Start isEmpty. Operand 415 states and 624 transitions. [2023-11-06 21:03:27,083 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 145 [2023-11-06 21:03:27,084 INFO L187 NwaCegarLoop]: Found error trace [2023-11-06 21:03:27,088 INFO L195 NwaCegarLoop]: 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, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-06 21:03:27,088 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-11-06 21:03:27,088 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-06 21:03:27,089 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 21:03:27,089 INFO L85 PathProgramCache]: Analyzing trace with hash -2038899430, now seen corresponding path program 1 times [2023-11-06 21:03:27,089 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-06 21:03:27,090 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [626431] [2023-11-06 21:03:27,090 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 21:03:27,090 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 21:03:27,145 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 21:03:27,467 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2023-11-06 21:03:27,467 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-06 21:03:27,468 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [626431] [2023-11-06 21:03:27,469 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [626431] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-06 21:03:27,469 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1208114039] [2023-11-06 21:03:27,469 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 21:03:27,470 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 21:03:27,470 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_494a82a0-2d01-436d-aab0-5aa777b49e4b/bin/utaipan-verify-FOvIYxoinp/z3 [2023-11-06 21:03:27,476 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_494a82a0-2d01-436d-aab0-5aa777b49e4b/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-06 21:03:27,488 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_494a82a0-2d01-436d-aab0-5aa777b49e4b/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-11-06 21:03:27,867 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 21:03:27,873 INFO L262 TraceCheckSpWp]: Trace formula consists of 1054 conjuncts, 2 conjunts are in the unsatisfiable core [2023-11-06 21:03:27,885 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-06 21:03:27,995 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 11 proven. 0 refuted. 0 times theorem prover too weak. 42 trivial. 0 not checked. [2023-11-06 21:03:27,998 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-06 21:03:28,002 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1208114039] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-06 21:03:28,003 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-06 21:03:28,003 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [4] total 5 [2023-11-06 21:03:28,005 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [628144232] [2023-11-06 21:03:28,006 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-06 21:03:28,007 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-06 21:03:28,007 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-06 21:03:28,008 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-06 21:03:28,009 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-11-06 21:03:28,009 INFO L87 Difference]: Start difference. First operand 415 states and 624 transitions. Second operand has 3 states, 3 states have (on average 29.666666666666668) internal successors, (89), 2 states have internal predecessors, (89), 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) [2023-11-06 21:03:28,245 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-06 21:03:28,245 INFO L93 Difference]: Finished difference Result 1228 states and 1877 transitions. [2023-11-06 21:03:28,246 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-06 21:03:28,246 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 29.666666666666668) internal successors, (89), 2 states have internal predecessors, (89), 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 144 [2023-11-06 21:03:28,246 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-06 21:03:28,255 INFO L225 Difference]: With dead ends: 1228 [2023-11-06 21:03:28,255 INFO L226 Difference]: Without dead ends: 818 [2023-11-06 21:03:28,257 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 147 GetRequests, 144 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-11-06 21:03:28,259 INFO L413 NwaCegarLoop]: 334 mSDtfsCounter, 299 mSDsluCounter, 263 mSDsCounter, 0 mSdLazyCounter, 109 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 299 SdHoareTripleChecker+Valid, 597 SdHoareTripleChecker+Invalid, 111 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 109 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-06 21:03:28,260 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [299 Valid, 597 Invalid, 111 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 109 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-06 21:03:28,264 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 818 states. [2023-11-06 21:03:28,333 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 818 to 812. [2023-11-06 21:03:28,336 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 812 states, 691 states have (on average 1.4891461649782922) internal successors, (1029), 695 states have internal predecessors, (1029), 96 states have call successors, (96), 25 states have call predecessors, (96), 24 states have return successors, (94), 92 states have call predecessors, (94), 94 states have call successors, (94) [2023-11-06 21:03:28,343 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 812 states to 812 states and 1219 transitions. [2023-11-06 21:03:28,344 INFO L78 Accepts]: Start accepts. Automaton has 812 states and 1219 transitions. Word has length 144 [2023-11-06 21:03:28,345 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-06 21:03:28,345 INFO L495 AbstractCegarLoop]: Abstraction has 812 states and 1219 transitions. [2023-11-06 21:03:28,345 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 29.666666666666668) internal successors, (89), 2 states have internal predecessors, (89), 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) [2023-11-06 21:03:28,345 INFO L276 IsEmpty]: Start isEmpty. Operand 812 states and 1219 transitions. [2023-11-06 21:03:28,357 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 145 [2023-11-06 21:03:28,357 INFO L187 NwaCegarLoop]: Found error trace [2023-11-06 21:03:28,357 INFO L195 NwaCegarLoop]: 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, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-06 21:03:28,372 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_494a82a0-2d01-436d-aab0-5aa777b49e4b/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-11-06 21:03:28,565 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_494a82a0-2d01-436d-aab0-5aa777b49e4b/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 21:03:28,565 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-06 21:03:28,566 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 21:03:28,566 INFO L85 PathProgramCache]: Analyzing trace with hash 854252572, now seen corresponding path program 1 times [2023-11-06 21:03:28,566 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-06 21:03:28,566 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2032435502] [2023-11-06 21:03:28,567 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 21:03:28,567 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 21:03:28,616 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 21:03:28,834 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2023-11-06 21:03:28,835 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-06 21:03:28,835 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2032435502] [2023-11-06 21:03:28,835 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2032435502] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-06 21:03:28,835 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [687164742] [2023-11-06 21:03:28,836 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 21:03:28,836 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 21:03:28,836 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_494a82a0-2d01-436d-aab0-5aa777b49e4b/bin/utaipan-verify-FOvIYxoinp/z3 [2023-11-06 21:03:28,837 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_494a82a0-2d01-436d-aab0-5aa777b49e4b/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-06 21:03:28,860 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_494a82a0-2d01-436d-aab0-5aa777b49e4b/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-11-06 21:03:29,117 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 21:03:29,123 INFO L262 TraceCheckSpWp]: Trace formula consists of 1048 conjuncts, 2 conjunts are in the unsatisfiable core [2023-11-06 21:03:29,130 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-06 21:03:29,200 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 35 proven. 0 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2023-11-06 21:03:29,201 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-06 21:03:29,201 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [687164742] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-06 21:03:29,201 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-06 21:03:29,201 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [4] total 5 [2023-11-06 21:03:29,202 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [99906606] [2023-11-06 21:03:29,202 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-06 21:03:29,203 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-06 21:03:29,203 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-06 21:03:29,204 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-06 21:03:29,204 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-11-06 21:03:29,204 INFO L87 Difference]: Start difference. First operand 812 states and 1219 transitions. Second operand has 3 states, 3 states have (on average 37.666666666666664) internal successors, (113), 2 states have internal predecessors, (113), 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) [2023-11-06 21:03:29,436 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-06 21:03:29,436 INFO L93 Difference]: Finished difference Result 2413 states and 3682 transitions. [2023-11-06 21:03:29,437 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-06 21:03:29,437 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 37.666666666666664) internal successors, (113), 2 states have internal predecessors, (113), 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 144 [2023-11-06 21:03:29,438 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-06 21:03:29,449 INFO L225 Difference]: With dead ends: 2413 [2023-11-06 21:03:29,449 INFO L226 Difference]: Without dead ends: 1606 [2023-11-06 21:03:29,453 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 147 GetRequests, 144 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-11-06 21:03:29,454 INFO L413 NwaCegarLoop]: 290 mSDtfsCounter, 275 mSDsluCounter, 263 mSDsCounter, 0 mSdLazyCounter, 109 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 275 SdHoareTripleChecker+Valid, 553 SdHoareTripleChecker+Invalid, 111 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 109 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-06 21:03:29,455 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [275 Valid, 553 Invalid, 111 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 109 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-06 21:03:29,457 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1606 states. [2023-11-06 21:03:29,549 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1606 to 1598. [2023-11-06 21:03:29,553 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1598 states, 1367 states have (on average 1.4857351865398682) internal successors, (2031), 1373 states have internal predecessors, (2031), 182 states have call successors, (182), 49 states have call predecessors, (182), 48 states have return successors, (180), 176 states have call predecessors, (180), 180 states have call successors, (180) [2023-11-06 21:03:29,611 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1598 states to 1598 states and 2393 transitions. [2023-11-06 21:03:29,611 INFO L78 Accepts]: Start accepts. Automaton has 1598 states and 2393 transitions. Word has length 144 [2023-11-06 21:03:29,612 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-06 21:03:29,614 INFO L495 AbstractCegarLoop]: Abstraction has 1598 states and 2393 transitions. [2023-11-06 21:03:29,614 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 37.666666666666664) internal successors, (113), 2 states have internal predecessors, (113), 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) [2023-11-06 21:03:29,614 INFO L276 IsEmpty]: Start isEmpty. Operand 1598 states and 2393 transitions. [2023-11-06 21:03:29,620 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 145 [2023-11-06 21:03:29,620 INFO L187 NwaCegarLoop]: Found error trace [2023-11-06 21:03:29,621 INFO L195 NwaCegarLoop]: 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, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-06 21:03:29,640 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_494a82a0-2d01-436d-aab0-5aa777b49e4b/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2023-11-06 21:03:29,827 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_494a82a0-2d01-436d-aab0-5aa777b49e4b/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 21:03:29,828 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-06 21:03:29,828 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 21:03:29,829 INFO L85 PathProgramCache]: Analyzing trace with hash -660913890, now seen corresponding path program 1 times [2023-11-06 21:03:29,829 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-06 21:03:29,829 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1324520933] [2023-11-06 21:03:29,829 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 21:03:29,829 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 21:03:29,871 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 21:03:30,041 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 0 proven. 36 refuted. 0 times theorem prover too weak. 17 trivial. 0 not checked. [2023-11-06 21:03:30,042 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-06 21:03:30,042 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1324520933] [2023-11-06 21:03:30,042 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1324520933] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-06 21:03:30,044 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1194101187] [2023-11-06 21:03:30,045 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 21:03:30,046 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 21:03:30,047 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_494a82a0-2d01-436d-aab0-5aa777b49e4b/bin/utaipan-verify-FOvIYxoinp/z3 [2023-11-06 21:03:30,048 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_494a82a0-2d01-436d-aab0-5aa777b49e4b/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-06 21:03:30,068 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_494a82a0-2d01-436d-aab0-5aa777b49e4b/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-11-06 21:03:30,315 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 21:03:30,320 INFO L262 TraceCheckSpWp]: Trace formula consists of 1042 conjuncts, 2 conjunts are in the unsatisfiable core [2023-11-06 21:03:30,326 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-06 21:03:30,366 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2023-11-06 21:03:30,366 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-06 21:03:30,367 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1194101187] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-06 21:03:30,367 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-06 21:03:30,367 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [4] total 5 [2023-11-06 21:03:30,367 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1433310229] [2023-11-06 21:03:30,368 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-06 21:03:30,368 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-06 21:03:30,368 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-06 21:03:30,369 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-06 21:03:30,369 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2023-11-06 21:03:30,370 INFO L87 Difference]: Start difference. First operand 1598 states and 2393 transitions. Second operand has 3 states, 3 states have (on average 28.666666666666668) internal successors, (86), 2 states have internal predecessors, (86), 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) [2023-11-06 21:03:30,743 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-06 21:03:30,744 INFO L93 Difference]: Finished difference Result 4759 states and 7242 transitions. [2023-11-06 21:03:30,744 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-06 21:03:30,745 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 28.666666666666668) internal successors, (86), 2 states have internal predecessors, (86), 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 144 [2023-11-06 21:03:30,745 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-06 21:03:30,771 INFO L225 Difference]: With dead ends: 4759 [2023-11-06 21:03:30,771 INFO L226 Difference]: Without dead ends: 3166 [2023-11-06 21:03:30,782 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 147 GetRequests, 144 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2023-11-06 21:03:30,785 INFO L413 NwaCegarLoop]: 272 mSDtfsCounter, 302 mSDsluCounter, 263 mSDsCounter, 0 mSdLazyCounter, 106 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 302 SdHoareTripleChecker+Valid, 535 SdHoareTripleChecker+Invalid, 108 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 106 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-06 21:03:30,787 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [302 Valid, 535 Invalid, 108 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 106 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-06 21:03:30,793 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3166 states. [2023-11-06 21:03:31,015 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3166 to 3154. [2023-11-06 21:03:31,022 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 3154 states, 2707 states have (on average 1.481714074621352) internal successors, (4011), 2717 states have internal predecessors, (4011), 350 states have call successors, (350), 97 states have call predecessors, (350), 96 states have return successors, (348), 340 states have call predecessors, (348), 348 states have call successors, (348) [2023-11-06 21:03:31,044 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 3154 states to 3154 states and 4709 transitions. [2023-11-06 21:03:31,045 INFO L78 Accepts]: Start accepts. Automaton has 3154 states and 4709 transitions. Word has length 144 [2023-11-06 21:03:31,045 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-06 21:03:31,045 INFO L495 AbstractCegarLoop]: Abstraction has 3154 states and 4709 transitions. [2023-11-06 21:03:31,046 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 28.666666666666668) internal successors, (86), 2 states have internal predecessors, (86), 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) [2023-11-06 21:03:31,046 INFO L276 IsEmpty]: Start isEmpty. Operand 3154 states and 4709 transitions. [2023-11-06 21:03:31,055 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 145 [2023-11-06 21:03:31,055 INFO L187 NwaCegarLoop]: Found error trace [2023-11-06 21:03:31,055 INFO L195 NwaCegarLoop]: 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, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-06 21:03:31,068 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_494a82a0-2d01-436d-aab0-5aa777b49e4b/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Ended with exit code 0 [2023-11-06 21:03:31,262 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_494a82a0-2d01-436d-aab0-5aa777b49e4b/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 21:03:31,262 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-06 21:03:31,262 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 21:03:31,263 INFO L85 PathProgramCache]: Analyzing trace with hash 2121648860, now seen corresponding path program 1 times [2023-11-06 21:03:31,263 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-06 21:03:31,263 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [315103158] [2023-11-06 21:03:31,263 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 21:03:31,263 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 21:03:31,302 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 21:03:31,451 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 0 proven. 27 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2023-11-06 21:03:31,452 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-06 21:03:31,452 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [315103158] [2023-11-06 21:03:31,452 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [315103158] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-06 21:03:31,452 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [618350466] [2023-11-06 21:03:31,452 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 21:03:31,453 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 21:03:31,453 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_494a82a0-2d01-436d-aab0-5aa777b49e4b/bin/utaipan-verify-FOvIYxoinp/z3 [2023-11-06 21:03:31,454 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_494a82a0-2d01-436d-aab0-5aa777b49e4b/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-06 21:03:31,476 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_494a82a0-2d01-436d-aab0-5aa777b49e4b/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-11-06 21:03:31,725 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 21:03:31,730 INFO L262 TraceCheckSpWp]: Trace formula consists of 1036 conjuncts, 2 conjunts are in the unsatisfiable core [2023-11-06 21:03:31,735 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-06 21:03:31,804 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 29 proven. 0 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2023-11-06 21:03:31,804 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-06 21:03:31,804 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [618350466] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-06 21:03:31,804 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-06 21:03:31,805 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [4] total 5 [2023-11-06 21:03:31,805 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [871702378] [2023-11-06 21:03:31,805 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-06 21:03:31,806 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-06 21:03:31,806 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-06 21:03:31,807 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-06 21:03:31,807 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-11-06 21:03:31,807 INFO L87 Difference]: Start difference. First operand 3154 states and 4709 transitions. Second operand has 3 states, 3 states have (on average 35.666666666666664) internal successors, (107), 2 states have internal predecessors, (107), 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) [2023-11-06 21:03:32,241 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-06 21:03:32,241 INFO L93 Difference]: Finished difference Result 9403 states and 14262 transitions. [2023-11-06 21:03:32,242 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-06 21:03:32,242 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 35.666666666666664) internal successors, (107), 2 states have internal predecessors, (107), 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 144 [2023-11-06 21:03:32,243 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-06 21:03:32,286 INFO L225 Difference]: With dead ends: 9403 [2023-11-06 21:03:32,286 INFO L226 Difference]: Without dead ends: 6254 [2023-11-06 21:03:32,332 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 147 GetRequests, 144 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-11-06 21:03:32,332 INFO L413 NwaCegarLoop]: 272 mSDtfsCounter, 281 mSDsluCounter, 263 mSDsCounter, 0 mSdLazyCounter, 106 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 281 SdHoareTripleChecker+Valid, 535 SdHoareTripleChecker+Invalid, 108 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 106 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-06 21:03:32,333 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [281 Valid, 535 Invalid, 108 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 106 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-06 21:03:32,342 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6254 states. [2023-11-06 21:03:32,666 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6254 to 6234. [2023-11-06 21:03:32,682 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 6234 states, 5363 states have (on average 1.4773447697184412) internal successors, (7923), 5381 states have internal predecessors, (7923), 678 states have call successors, (678), 193 states have call predecessors, (678), 192 states have return successors, (676), 660 states have call predecessors, (676), 676 states have call successors, (676) [2023-11-06 21:03:32,714 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6234 states to 6234 states and 9277 transitions. [2023-11-06 21:03:32,715 INFO L78 Accepts]: Start accepts. Automaton has 6234 states and 9277 transitions. Word has length 144 [2023-11-06 21:03:32,717 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-06 21:03:32,717 INFO L495 AbstractCegarLoop]: Abstraction has 6234 states and 9277 transitions. [2023-11-06 21:03:32,717 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 35.666666666666664) internal successors, (107), 2 states have internal predecessors, (107), 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) [2023-11-06 21:03:32,717 INFO L276 IsEmpty]: Start isEmpty. Operand 6234 states and 9277 transitions. [2023-11-06 21:03:32,732 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 145 [2023-11-06 21:03:32,732 INFO L187 NwaCegarLoop]: Found error trace [2023-11-06 21:03:32,733 INFO L195 NwaCegarLoop]: 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, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-06 21:03:32,744 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_494a82a0-2d01-436d-aab0-5aa777b49e4b/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Ended with exit code 0 [2023-11-06 21:03:32,939 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_494a82a0-2d01-436d-aab0-5aa777b49e4b/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 21:03:32,939 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-06 21:03:32,940 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 21:03:32,940 INFO L85 PathProgramCache]: Analyzing trace with hash 1599268446, now seen corresponding path program 1 times [2023-11-06 21:03:32,940 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-06 21:03:32,940 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [201220106] [2023-11-06 21:03:32,940 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 21:03:32,940 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 21:03:33,007 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 21:03:33,164 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 0 proven. 27 refuted. 0 times theorem prover too weak. 26 trivial. 0 not checked. [2023-11-06 21:03:33,164 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-06 21:03:33,164 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [201220106] [2023-11-06 21:03:33,164 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [201220106] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-06 21:03:33,165 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1259431631] [2023-11-06 21:03:33,165 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 21:03:33,165 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 21:03:33,165 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_494a82a0-2d01-436d-aab0-5aa777b49e4b/bin/utaipan-verify-FOvIYxoinp/z3 [2023-11-06 21:03:33,168 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_494a82a0-2d01-436d-aab0-5aa777b49e4b/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-06 21:03:33,177 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_494a82a0-2d01-436d-aab0-5aa777b49e4b/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-11-06 21:03:33,438 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 21:03:33,443 INFO L262 TraceCheckSpWp]: Trace formula consists of 1030 conjuncts, 2 conjunts are in the unsatisfiable core [2023-11-06 21:03:33,447 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-06 21:03:33,494 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 17 proven. 0 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2023-11-06 21:03:33,494 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-06 21:03:33,494 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1259431631] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-06 21:03:33,494 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-06 21:03:33,495 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [4] total 4 [2023-11-06 21:03:33,495 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [533695254] [2023-11-06 21:03:33,495 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-06 21:03:33,496 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-06 21:03:33,496 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-06 21:03:33,497 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-06 21:03:33,497 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-11-06 21:03:33,497 INFO L87 Difference]: Start difference. First operand 6234 states and 9277 transitions. Second operand has 3 states, 3 states have (on average 31.666666666666668) internal successors, (95), 2 states have internal predecessors, (95), 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) [2023-11-06 21:03:34,282 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-06 21:03:34,283 INFO L93 Difference]: Finished difference Result 18595 states and 28102 transitions. [2023-11-06 21:03:34,283 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-06 21:03:34,284 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 31.666666666666668) internal successors, (95), 2 states have internal predecessors, (95), 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 144 [2023-11-06 21:03:34,284 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-06 21:03:34,390 INFO L225 Difference]: With dead ends: 18595 [2023-11-06 21:03:34,391 INFO L226 Difference]: Without dead ends: 12366 [2023-11-06 21:03:34,421 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 147 GetRequests, 145 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-11-06 21:03:34,422 INFO L413 NwaCegarLoop]: 290 mSDtfsCounter, 293 mSDsluCounter, 263 mSDsCounter, 0 mSdLazyCounter, 109 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 293 SdHoareTripleChecker+Valid, 553 SdHoareTripleChecker+Invalid, 111 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 109 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-06 21:03:34,423 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [293 Valid, 553 Invalid, 111 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 109 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-06 21:03:34,445 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12366 states. [2023-11-06 21:03:35,078 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12366 to 12330. [2023-11-06 21:03:35,178 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 12330 states, 10627 states have (on average 1.4727580690693516) internal successors, (15651), 10661 states have internal predecessors, (15651), 1318 states have call successors, (1318), 385 states have call predecessors, (1318), 384 states have return successors, (1316), 1284 states have call predecessors, (1316), 1316 states have call successors, (1316) [2023-11-06 21:03:35,228 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12330 states to 12330 states and 18285 transitions. [2023-11-06 21:03:35,230 INFO L78 Accepts]: Start accepts. Automaton has 12330 states and 18285 transitions. Word has length 144 [2023-11-06 21:03:35,230 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-06 21:03:35,230 INFO L495 AbstractCegarLoop]: Abstraction has 12330 states and 18285 transitions. [2023-11-06 21:03:35,230 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 31.666666666666668) internal successors, (95), 2 states have internal predecessors, (95), 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) [2023-11-06 21:03:35,231 INFO L276 IsEmpty]: Start isEmpty. Operand 12330 states and 18285 transitions. [2023-11-06 21:03:35,259 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 145 [2023-11-06 21:03:35,259 INFO L187 NwaCegarLoop]: Found error trace [2023-11-06 21:03:35,260 INFO L195 NwaCegarLoop]: 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, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-06 21:03:35,268 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_494a82a0-2d01-436d-aab0-5aa777b49e4b/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2023-11-06 21:03:35,466 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_494a82a0-2d01-436d-aab0-5aa777b49e4b/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 21:03:35,467 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-06 21:03:35,467 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 21:03:35,467 INFO L85 PathProgramCache]: Analyzing trace with hash -857157920, now seen corresponding path program 1 times [2023-11-06 21:03:35,467 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-06 21:03:35,467 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [791710990] [2023-11-06 21:03:35,467 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 21:03:35,468 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 21:03:35,510 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 21:03:35,664 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2023-11-06 21:03:35,664 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-06 21:03:35,664 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [791710990] [2023-11-06 21:03:35,664 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [791710990] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-06 21:03:35,665 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1195542386] [2023-11-06 21:03:35,665 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 21:03:35,665 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 21:03:35,665 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_494a82a0-2d01-436d-aab0-5aa777b49e4b/bin/utaipan-verify-FOvIYxoinp/z3 [2023-11-06 21:03:35,666 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_494a82a0-2d01-436d-aab0-5aa777b49e4b/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-06 21:03:35,672 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_494a82a0-2d01-436d-aab0-5aa777b49e4b/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2023-11-06 21:03:35,936 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 21:03:35,941 INFO L262 TraceCheckSpWp]: Trace formula consists of 1024 conjuncts, 2 conjunts are in the unsatisfiable core [2023-11-06 21:03:35,945 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-06 21:03:36,026 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 38 proven. 0 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2023-11-06 21:03:36,027 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-06 21:03:36,027 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1195542386] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-06 21:03:36,027 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-06 21:03:36,027 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [4] total 5 [2023-11-06 21:03:36,028 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [245348393] [2023-11-06 21:03:36,028 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-06 21:03:36,028 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-06 21:03:36,029 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-06 21:03:36,029 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-06 21:03:36,031 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-11-06 21:03:36,032 INFO L87 Difference]: Start difference. First operand 12330 states and 18285 transitions. Second operand has 3 states, 3 states have (on average 38.666666666666664) internal successors, (116), 2 states have internal predecessors, (116), 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) [2023-11-06 21:03:37,523 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-06 21:03:37,524 INFO L93 Difference]: Finished difference Result 36787 states and 55382 transitions. [2023-11-06 21:03:37,524 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-06 21:03:37,525 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 38.666666666666664) internal successors, (116), 2 states have internal predecessors, (116), 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 144 [2023-11-06 21:03:37,525 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-06 21:03:37,658 INFO L225 Difference]: With dead ends: 36787 [2023-11-06 21:03:37,659 INFO L226 Difference]: Without dead ends: 24462 [2023-11-06 21:03:37,719 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 147 GetRequests, 144 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-11-06 21:03:37,720 INFO L413 NwaCegarLoop]: 272 mSDtfsCounter, 272 mSDsluCounter, 263 mSDsCounter, 0 mSdLazyCounter, 106 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 272 SdHoareTripleChecker+Valid, 535 SdHoareTripleChecker+Invalid, 108 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 106 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-06 21:03:37,720 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [272 Valid, 535 Invalid, 108 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 106 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-06 21:03:37,757 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24462 states. [2023-11-06 21:03:38,983 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24462 to 24394. [2023-11-06 21:03:39,035 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24394 states, 21059 states have (on average 1.468018424426611) internal successors, (30915), 21125 states have internal predecessors, (30915), 2566 states have call successors, (2566), 769 states have call predecessors, (2566), 768 states have return successors, (2564), 2500 states have call predecessors, (2564), 2564 states have call successors, (2564) [2023-11-06 21:03:39,139 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24394 states to 24394 states and 36045 transitions. [2023-11-06 21:03:39,142 INFO L78 Accepts]: Start accepts. Automaton has 24394 states and 36045 transitions. Word has length 144 [2023-11-06 21:03:39,143 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-06 21:03:39,143 INFO L495 AbstractCegarLoop]: Abstraction has 24394 states and 36045 transitions. [2023-11-06 21:03:39,144 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 38.666666666666664) internal successors, (116), 2 states have internal predecessors, (116), 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) [2023-11-06 21:03:39,144 INFO L276 IsEmpty]: Start isEmpty. Operand 24394 states and 36045 transitions. [2023-11-06 21:03:39,195 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 145 [2023-11-06 21:03:39,196 INFO L187 NwaCegarLoop]: Found error trace [2023-11-06 21:03:39,196 INFO L195 NwaCegarLoop]: 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, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-06 21:03:39,204 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_494a82a0-2d01-436d-aab0-5aa777b49e4b/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2023-11-06 21:03:39,404 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_494a82a0-2d01-436d-aab0-5aa777b49e4b/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2023-11-06 21:03:39,404 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-06 21:03:39,405 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 21:03:39,405 INFO L85 PathProgramCache]: Analyzing trace with hash 2091931934, now seen corresponding path program 1 times [2023-11-06 21:03:39,405 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-06 21:03:39,405 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1613802331] [2023-11-06 21:03:39,405 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 21:03:39,406 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 21:03:39,447 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 21:03:39,556 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2023-11-06 21:03:39,556 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-06 21:03:39,556 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1613802331] [2023-11-06 21:03:39,557 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1613802331] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-06 21:03:39,557 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [571246433] [2023-11-06 21:03:39,557 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 21:03:39,557 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 21:03:39,557 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_494a82a0-2d01-436d-aab0-5aa777b49e4b/bin/utaipan-verify-FOvIYxoinp/z3 [2023-11-06 21:03:39,558 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_494a82a0-2d01-436d-aab0-5aa777b49e4b/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-06 21:03:39,564 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_494a82a0-2d01-436d-aab0-5aa777b49e4b/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2023-11-06 21:03:39,969 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 21:03:39,974 INFO L262 TraceCheckSpWp]: Trace formula consists of 1018 conjuncts, 2 conjunts are in the unsatisfiable core [2023-11-06 21:03:39,978 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-06 21:03:40,021 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 23 proven. 0 refuted. 0 times theorem prover too weak. 30 trivial. 0 not checked. [2023-11-06 21:03:40,022 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-06 21:03:40,022 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [571246433] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-06 21:03:40,022 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-06 21:03:40,022 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [4] total 4 [2023-11-06 21:03:40,023 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [83326614] [2023-11-06 21:03:40,023 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-06 21:03:40,023 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-06 21:03:40,024 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-06 21:03:40,024 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-06 21:03:40,024 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-11-06 21:03:40,025 INFO L87 Difference]: Start difference. First operand 24394 states and 36045 transitions. Second operand has 3 states, 3 states have (on average 33.666666666666664) internal successors, (101), 2 states have internal predecessors, (101), 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) [2023-11-06 21:03:42,502 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-06 21:03:42,502 INFO L93 Difference]: Finished difference Result 72787 states and 109142 transitions. [2023-11-06 21:03:42,503 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-06 21:03:42,503 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 33.666666666666664) internal successors, (101), 2 states have internal predecessors, (101), 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 144 [2023-11-06 21:03:42,504 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-06 21:03:42,764 INFO L225 Difference]: With dead ends: 72787 [2023-11-06 21:03:42,764 INFO L226 Difference]: Without dead ends: 48398 [2023-11-06 21:03:43,033 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 147 GetRequests, 145 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-11-06 21:03:43,036 INFO L413 NwaCegarLoop]: 272 mSDtfsCounter, 287 mSDsluCounter, 263 mSDsCounter, 0 mSdLazyCounter, 106 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 287 SdHoareTripleChecker+Valid, 535 SdHoareTripleChecker+Invalid, 108 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 106 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-06 21:03:43,036 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [287 Valid, 535 Invalid, 108 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 106 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-06 21:03:43,089 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48398 states. [2023-11-06 21:03:45,659 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48398 to 48266. [2023-11-06 21:03:45,724 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 48266 states, 41731 states have (on average 1.4631568857683737) internal successors, (61059), 41861 states have internal predecessors, (61059), 4998 states have call successors, (4998), 1537 states have call predecessors, (4998), 1536 states have return successors, (4996), 4868 states have call predecessors, (4996), 4996 states have call successors, (4996) [2023-11-06 21:03:46,210 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48266 states to 48266 states and 71053 transitions. [2023-11-06 21:03:46,226 INFO L78 Accepts]: Start accepts. Automaton has 48266 states and 71053 transitions. Word has length 144 [2023-11-06 21:03:46,226 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-06 21:03:46,227 INFO L495 AbstractCegarLoop]: Abstraction has 48266 states and 71053 transitions. [2023-11-06 21:03:46,227 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 33.666666666666664) internal successors, (101), 2 states have internal predecessors, (101), 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) [2023-11-06 21:03:46,227 INFO L276 IsEmpty]: Start isEmpty. Operand 48266 states and 71053 transitions. [2023-11-06 21:03:46,320 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 145 [2023-11-06 21:03:46,321 INFO L187 NwaCegarLoop]: Found error trace [2023-11-06 21:03:46,321 INFO L195 NwaCegarLoop]: 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, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-06 21:03:46,344 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_494a82a0-2d01-436d-aab0-5aa777b49e4b/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2023-11-06 21:03:46,527 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_494a82a0-2d01-436d-aab0-5aa777b49e4b/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 21:03:46,528 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting errorErr0ASSERT_VIOLATIONERROR_FUNCTION === [errorErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-06 21:03:46,529 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 21:03:46,529 INFO L85 PathProgramCache]: Analyzing trace with hash -1460188384, now seen corresponding path program 1 times [2023-11-06 21:03:46,529 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-06 21:03:46,529 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [42287491] [2023-11-06 21:03:46,529 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 21:03:46,530 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 21:03:46,581 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 21:03:47,505 INFO L134 CoverageAnalysis]: Checked inductivity of 53 backedges. 7 proven. 0 refuted. 0 times theorem prover too weak. 46 trivial. 0 not checked. [2023-11-06 21:03:47,505 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-06 21:03:47,506 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [42287491] [2023-11-06 21:03:47,506 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [42287491] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-06 21:03:47,506 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-06 21:03:47,506 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2023-11-06 21:03:47,506 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [986026889] [2023-11-06 21:03:47,507 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-06 21:03:47,507 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-11-06 21:03:47,507 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-06 21:03:47,508 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-11-06 21:03:47,508 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2023-11-06 21:03:47,508 INFO L87 Difference]: Start difference. First operand 48266 states and 71053 transitions. Second operand has 6 states, 6 states have (on average 13.833333333333334) internal successors, (83), 6 states have internal predecessors, (83), 4 states have call successors, (9), 3 states have call predecessors, (9), 2 states have return successors, (8), 4 states have call predecessors, (8), 4 states have call successors, (8)