./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/array-examples/sanfoundry_10_ground.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 0e0057cc Calling Ultimate with: /usr/lib/jvm/java-11-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e286c196-a85b-43b5-adb4-d9d14dae5c99/bin/utaipan-verify-nQ1chXbOIh/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e286c196-a85b-43b5-adb4-d9d14dae5c99/bin/utaipan-verify-nQ1chXbOIh/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e286c196-a85b-43b5-adb4-d9d14dae5c99/bin/utaipan-verify-nQ1chXbOIh/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e286c196-a85b-43b5-adb4-d9d14dae5c99/bin/utaipan-verify-nQ1chXbOIh/config/TaipanReach.xml -i ../../sv-benchmarks/c/array-examples/sanfoundry_10_ground.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e286c196-a85b-43b5-adb4-d9d14dae5c99/bin/utaipan-verify-nQ1chXbOIh/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e286c196-a85b-43b5-adb4-d9d14dae5c99/bin/utaipan-verify-nQ1chXbOIh --witnessprinter.witness.filename witness --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 2638891780f697dd700286595ba75a607e61cda7473ecc330660e8dbb3e9ba64 --- Real Ultimate output --- This is Ultimate 0.2.4-dev-0e0057c [2023-12-02 17:30:12,751 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-12-02 17:30:12,837 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e286c196-a85b-43b5-adb4-d9d14dae5c99/bin/utaipan-verify-nQ1chXbOIh/config/svcomp-Reach-32bit-Taipan_Default.epf [2023-12-02 17:30:12,841 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-12-02 17:30:12,842 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-12-02 17:30:12,865 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-12-02 17:30:12,866 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-12-02 17:30:12,866 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-12-02 17:30:12,867 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-12-02 17:30:12,867 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-12-02 17:30:12,868 INFO L153 SettingsManager]: * User list type=DISABLED [2023-12-02 17:30:12,869 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-12-02 17:30:12,869 INFO L153 SettingsManager]: * Explicit value domain=true [2023-12-02 17:30:12,870 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-12-02 17:30:12,870 INFO L153 SettingsManager]: * Octagon Domain=false [2023-12-02 17:30:12,871 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-12-02 17:30:12,871 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-12-02 17:30:12,872 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-12-02 17:30:12,872 INFO L153 SettingsManager]: * Interval Domain=false [2023-12-02 17:30:12,873 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-12-02 17:30:12,873 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-12-02 17:30:12,874 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2023-12-02 17:30:12,875 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-12-02 17:30:12,876 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-12-02 17:30:12,876 INFO L153 SettingsManager]: * sizeof long=4 [2023-12-02 17:30:12,876 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-12-02 17:30:12,877 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-12-02 17:30:12,877 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-12-02 17:30:12,878 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-12-02 17:30:12,878 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-12-02 17:30:12,879 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-12-02 17:30:12,879 INFO L153 SettingsManager]: * sizeof long double=12 [2023-12-02 17:30:12,879 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2023-12-02 17:30:12,880 INFO L153 SettingsManager]: * Use constant arrays=true [2023-12-02 17:30:12,880 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-12-02 17:30:12,880 INFO L153 SettingsManager]: * Only consider context switches at boundaries of atomic blocks=true [2023-12-02 17:30:12,880 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-12-02 17:30:12,881 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-12-02 17:30:12,881 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-12-02 17:30:12,881 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-12-02 17:30:12,881 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2023-12-02 17:30:12,882 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-12-02 17:30:12,882 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-12-02 17:30:12,882 INFO L153 SettingsManager]: * Apply one-shot large block encoding in concurrent analysis=false [2023-12-02 17:30:12,882 INFO L153 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-12-02 17:30:12,882 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-12-02 17:30:12,882 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-12-02 17:30:12,883 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_e286c196-a85b-43b5-adb4-d9d14dae5c99/bin/utaipan-verify-nQ1chXbOIh/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e286c196-a85b-43b5-adb4-d9d14dae5c99/bin/utaipan-verify-nQ1chXbOIh Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 2638891780f697dd700286595ba75a607e61cda7473ecc330660e8dbb3e9ba64 [2023-12-02 17:30:13,111 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-12-02 17:30:13,133 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-12-02 17:30:13,135 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-12-02 17:30:13,137 INFO L270 PluginConnector]: Initializing CDTParser... [2023-12-02 17:30:13,137 INFO L274 PluginConnector]: CDTParser initialized [2023-12-02 17:30:13,138 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e286c196-a85b-43b5-adb4-d9d14dae5c99/bin/utaipan-verify-nQ1chXbOIh/../../sv-benchmarks/c/array-examples/sanfoundry_10_ground.c [2023-12-02 17:30:15,851 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-12-02 17:30:16,033 INFO L384 CDTParser]: Found 1 translation units. [2023-12-02 17:30:16,033 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e286c196-a85b-43b5-adb4-d9d14dae5c99/sv-benchmarks/c/array-examples/sanfoundry_10_ground.c [2023-12-02 17:30:16,039 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e286c196-a85b-43b5-adb4-d9d14dae5c99/bin/utaipan-verify-nQ1chXbOIh/data/1c3af0004/706b00f426a440e6b3615d1bf959e06f/FLAG6d34c089e [2023-12-02 17:30:16,053 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e286c196-a85b-43b5-adb4-d9d14dae5c99/bin/utaipan-verify-nQ1chXbOIh/data/1c3af0004/706b00f426a440e6b3615d1bf959e06f [2023-12-02 17:30:16,055 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-12-02 17:30:16,057 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-12-02 17:30:16,058 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-12-02 17:30:16,058 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-12-02 17:30:16,063 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-12-02 17:30:16,064 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.12 05:30:16" (1/1) ... [2023-12-02 17:30:16,065 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@32567cf1 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 05:30:16, skipping insertion in model container [2023-12-02 17:30:16,065 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.12 05:30:16" (1/1) ... [2023-12-02 17:30:16,086 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-12-02 17:30:16,230 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_e286c196-a85b-43b5-adb4-d9d14dae5c99/sv-benchmarks/c/array-examples/sanfoundry_10_ground.c[324,337] [2023-12-02 17:30:16,247 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-12-02 17:30:16,257 INFO L202 MainTranslator]: Completed pre-run [2023-12-02 17:30:16,269 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_e286c196-a85b-43b5-adb4-d9d14dae5c99/sv-benchmarks/c/array-examples/sanfoundry_10_ground.c[324,337] [2023-12-02 17:30:16,277 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-12-02 17:30:16,292 INFO L206 MainTranslator]: Completed translation [2023-12-02 17:30:16,293 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 05:30:16 WrapperNode [2023-12-02 17:30:16,293 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-12-02 17:30:16,294 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-12-02 17:30:16,294 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-12-02 17:30:16,294 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-12-02 17:30:16,302 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 05:30:16" (1/1) ... [2023-12-02 17:30:16,309 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 05:30:16" (1/1) ... [2023-12-02 17:30:16,329 INFO L138 Inliner]: procedures = 14, calls = 16, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 81 [2023-12-02 17:30:16,329 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-12-02 17:30:16,330 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-12-02 17:30:16,330 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-12-02 17:30:16,330 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-12-02 17:30:16,339 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 05:30:16" (1/1) ... [2023-12-02 17:30:16,339 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 05:30:16" (1/1) ... [2023-12-02 17:30:16,341 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 05:30:16" (1/1) ... [2023-12-02 17:30:16,341 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 05:30:16" (1/1) ... [2023-12-02 17:30:16,347 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 05:30:16" (1/1) ... [2023-12-02 17:30:16,351 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 05:30:16" (1/1) ... [2023-12-02 17:30:16,352 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 05:30:16" (1/1) ... [2023-12-02 17:30:16,354 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 05:30:16" (1/1) ... [2023-12-02 17:30:16,356 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-12-02 17:30:16,357 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-12-02 17:30:16,357 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-12-02 17:30:16,357 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-12-02 17:30:16,358 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 05:30:16" (1/1) ... [2023-12-02 17:30:16,364 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-12-02 17:30:16,375 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e286c196-a85b-43b5-adb4-d9d14dae5c99/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 17:30:16,387 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e286c196-a85b-43b5-adb4-d9d14dae5c99/bin/utaipan-verify-nQ1chXbOIh/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-12-02 17:30:16,393 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e286c196-a85b-43b5-adb4-d9d14dae5c99/bin/utaipan-verify-nQ1chXbOIh/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-12-02 17:30:16,424 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-12-02 17:30:16,424 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-12-02 17:30:16,424 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2023-12-02 17:30:16,424 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-12-02 17:30:16,424 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-12-02 17:30:16,424 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-12-02 17:30:16,425 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-12-02 17:30:16,425 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-12-02 17:30:16,500 INFO L241 CfgBuilder]: Building ICFG [2023-12-02 17:30:16,503 INFO L267 CfgBuilder]: Building CFG for each procedure with an implementation [2023-12-02 17:30:16,643 INFO L282 CfgBuilder]: Performing block encoding [2023-12-02 17:30:16,697 INFO L304 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-12-02 17:30:16,697 INFO L309 CfgBuilder]: Removed 4 assume(true) statements. [2023-12-02 17:30:16,699 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.12 05:30:16 BoogieIcfgContainer [2023-12-02 17:30:16,699 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-12-02 17:30:16,702 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-12-02 17:30:16,702 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-12-02 17:30:16,706 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-12-02 17:30:16,706 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.12 05:30:16" (1/3) ... [2023-12-02 17:30:16,707 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@29897487 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.12 05:30:16, skipping insertion in model container [2023-12-02 17:30:16,707 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 05:30:16" (2/3) ... [2023-12-02 17:30:16,707 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@29897487 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.12 05:30:16, skipping insertion in model container [2023-12-02 17:30:16,707 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.12 05:30:16" (3/3) ... [2023-12-02 17:30:16,709 INFO L112 eAbstractionObserver]: Analyzing ICFG sanfoundry_10_ground.c [2023-12-02 17:30:16,728 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-12-02 17:30:16,728 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-12-02 17:30:16,779 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-12-02 17:30:16,786 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=LoopHeads, 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;@19d80421, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-12-02 17:30:16,787 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-12-02 17:30:16,791 INFO L276 IsEmpty]: Start isEmpty. Operand has 13 states, 11 states have (on average 1.7272727272727273) internal successors, (19), 12 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 17:30:16,797 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2023-12-02 17:30:16,797 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 17:30:16,797 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 17:30:16,798 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 17:30:16,803 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 17:30:16,803 INFO L85 PathProgramCache]: Analyzing trace with hash -742071715, now seen corresponding path program 1 times [2023-12-02 17:30:16,813 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 17:30:16,813 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1362034616] [2023-12-02 17:30:16,814 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 17:30:16,814 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 17:30:16,908 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 17:30:17,030 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 17:30:17,031 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 17:30:17,031 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1362034616] [2023-12-02 17:30:17,032 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1362034616] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 17:30:17,032 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 17:30:17,032 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-12-02 17:30:17,034 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1663768462] [2023-12-02 17:30:17,035 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 17:30:17,039 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 17:30:17,039 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 17:30:17,079 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 17:30:17,080 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-12-02 17:30:17,082 INFO L87 Difference]: Start difference. First operand has 13 states, 11 states have (on average 1.7272727272727273) internal successors, (19), 12 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 2 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 17:30:17,130 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 17:30:17,131 INFO L93 Difference]: Finished difference Result 25 states and 37 transitions. [2023-12-02 17:30:17,132 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 17:30:17,133 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 2 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 8 [2023-12-02 17:30:17,134 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 17:30:17,141 INFO L225 Difference]: With dead ends: 25 [2023-12-02 17:30:17,141 INFO L226 Difference]: Without dead ends: 12 [2023-12-02 17:30:17,143 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-12-02 17:30:17,147 INFO L413 NwaCegarLoop]: 8 mSDtfsCounter, 0 mSDsluCounter, 7 mSDsCounter, 0 mSdLazyCounter, 20 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 15 SdHoareTripleChecker+Invalid, 20 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 20 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-12-02 17:30:17,148 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 15 Invalid, 20 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 20 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-12-02 17:30:17,161 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2023-12-02 17:30:17,169 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 12. [2023-12-02 17:30:17,170 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 12 states, 11 states have (on average 1.4545454545454546) internal successors, (16), 11 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 17:30:17,170 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 16 transitions. [2023-12-02 17:30:17,171 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 16 transitions. Word has length 8 [2023-12-02 17:30:17,171 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 17:30:17,172 INFO L495 AbstractCegarLoop]: Abstraction has 12 states and 16 transitions. [2023-12-02 17:30:17,172 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 2 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 17:30:17,172 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 16 transitions. [2023-12-02 17:30:17,173 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2023-12-02 17:30:17,173 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 17:30:17,173 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 17:30:17,173 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-12-02 17:30:17,173 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 17:30:17,174 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 17:30:17,174 INFO L85 PathProgramCache]: Analyzing trace with hash -1210076268, now seen corresponding path program 1 times [2023-12-02 17:30:17,174 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 17:30:17,174 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [652228162] [2023-12-02 17:30:17,174 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 17:30:17,175 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 17:30:17,195 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 17:30:17,292 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 17:30:17,292 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 17:30:17,293 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [652228162] [2023-12-02 17:30:17,293 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [652228162] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 17:30:17,293 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 17:30:17,293 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-12-02 17:30:17,293 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1797951721] [2023-12-02 17:30:17,293 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 17:30:17,294 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-12-02 17:30:17,295 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 17:30:17,295 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-12-02 17:30:17,296 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2023-12-02 17:30:17,296 INFO L87 Difference]: Start difference. First operand 12 states and 16 transitions. Second operand has 4 states, 4 states have (on average 2.25) internal successors, (9), 3 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 17:30:17,330 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 17:30:17,330 INFO L93 Difference]: Finished difference Result 21 states and 28 transitions. [2023-12-02 17:30:17,330 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-12-02 17:30:17,330 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.25) internal successors, (9), 3 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 9 [2023-12-02 17:30:17,331 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 17:30:17,331 INFO L225 Difference]: With dead ends: 21 [2023-12-02 17:30:17,331 INFO L226 Difference]: Without dead ends: 13 [2023-12-02 17:30:17,332 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2023-12-02 17:30:17,333 INFO L413 NwaCegarLoop]: 7 mSDtfsCounter, 0 mSDsluCounter, 8 mSDsCounter, 0 mSdLazyCounter, 25 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 15 SdHoareTripleChecker+Invalid, 26 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 25 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-12-02 17:30:17,334 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 15 Invalid, 26 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 25 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-12-02 17:30:17,335 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2023-12-02 17:30:17,338 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2023-12-02 17:30:17,338 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 13 states, 12 states have (on average 1.4166666666666667) internal successors, (17), 12 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 17:30:17,339 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 17 transitions. [2023-12-02 17:30:17,339 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 17 transitions. Word has length 9 [2023-12-02 17:30:17,339 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 17:30:17,339 INFO L495 AbstractCegarLoop]: Abstraction has 13 states and 17 transitions. [2023-12-02 17:30:17,340 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 2.25) internal successors, (9), 3 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 17:30:17,340 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 17 transitions. [2023-12-02 17:30:17,340 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2023-12-02 17:30:17,340 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 17:30:17,340 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 17:30:17,341 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2023-12-02 17:30:17,341 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 17:30:17,341 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 17:30:17,342 INFO L85 PathProgramCache]: Analyzing trace with hash 794856256, now seen corresponding path program 1 times [2023-12-02 17:30:17,342 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 17:30:17,342 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1132012242] [2023-12-02 17:30:17,342 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 17:30:17,342 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 17:30:17,359 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 17:30:17,390 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-12-02 17:30:17,390 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 17:30:17,391 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1132012242] [2023-12-02 17:30:17,391 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1132012242] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 17:30:17,391 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 17:30:17,391 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-12-02 17:30:17,391 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1213628846] [2023-12-02 17:30:17,392 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 17:30:17,392 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 17:30:17,392 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 17:30:17,393 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 17:30:17,393 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-12-02 17:30:17,393 INFO L87 Difference]: Start difference. First operand 13 states and 17 transitions. Second operand has 3 states, 3 states have (on average 3.3333333333333335) internal successors, (10), 3 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 17:30:17,415 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 17:30:17,415 INFO L93 Difference]: Finished difference Result 19 states and 23 transitions. [2023-12-02 17:30:17,416 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 17:30:17,416 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 3.3333333333333335) internal successors, (10), 3 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 10 [2023-12-02 17:30:17,417 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 17:30:17,417 INFO L225 Difference]: With dead ends: 19 [2023-12-02 17:30:17,417 INFO L226 Difference]: Without dead ends: 13 [2023-12-02 17:30:17,418 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-12-02 17:30:17,419 INFO L413 NwaCegarLoop]: 7 mSDtfsCounter, 2 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 15 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 11 SdHoareTripleChecker+Invalid, 16 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 15 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-12-02 17:30:17,420 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [2 Valid, 11 Invalid, 16 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 15 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-12-02 17:30:17,421 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2023-12-02 17:30:17,424 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2023-12-02 17:30:17,424 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 13 states, 12 states have (on average 1.3333333333333333) internal successors, (16), 12 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 17:30:17,425 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 16 transitions. [2023-12-02 17:30:17,425 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 16 transitions. Word has length 10 [2023-12-02 17:30:17,426 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 17:30:17,426 INFO L495 AbstractCegarLoop]: Abstraction has 13 states and 16 transitions. [2023-12-02 17:30:17,426 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 3.3333333333333335) internal successors, (10), 3 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 17:30:17,426 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 16 transitions. [2023-12-02 17:30:17,427 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2023-12-02 17:30:17,427 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 17:30:17,427 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 17:30:17,427 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2023-12-02 17:30:17,427 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 17:30:17,428 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 17:30:17,428 INFO L85 PathProgramCache]: Analyzing trace with hash -1517379864, now seen corresponding path program 1 times [2023-12-02 17:30:17,428 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 17:30:17,429 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [672023104] [2023-12-02 17:30:17,429 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 17:30:17,429 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 17:30:17,450 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 17:30:17,518 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 17:30:17,518 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 17:30:17,519 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [672023104] [2023-12-02 17:30:17,519 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [672023104] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 17:30:17,519 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [95084392] [2023-12-02 17:30:17,519 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 17:30:17,520 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 17:30:17,520 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e286c196-a85b-43b5-adb4-d9d14dae5c99/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 17:30:17,527 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e286c196-a85b-43b5-adb4-d9d14dae5c99/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 17:30:17,528 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e286c196-a85b-43b5-adb4-d9d14dae5c99/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-12-02 17:30:17,586 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 17:30:17,588 INFO L262 TraceCheckSpWp]: Trace formula consists of 77 conjuncts, 4 conjunts are in the unsatisfiable core [2023-12-02 17:30:17,592 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 17:30:17,647 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 17:30:17,647 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 17:30:17,669 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 17:30:17,669 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [95084392] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 17:30:17,669 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [252674233] [2023-12-02 17:30:17,689 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2023-12-02 17:30:17,689 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 17:30:17,692 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 17:30:17,697 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 17:30:17,698 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 17:30:18,198 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 17:30:18,568 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '237#(and (= |ULTIMATE.start_main_~#vectorx~0#1.offset| 0) (<= 1 |#StackHeapBarrier|) (not (= |ULTIMATE.start_main_~found~0#1| 0)) (= 100000 |ULTIMATE.start_main_~n~0#1|) (= (select (select |#memory_int| |ULTIMATE.start_main_~#vectorx~0#1.base|) 0) |ULTIMATE.start_main_#t~mem12#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= |ULTIMATE.start_main_~element~0#1| 2147483647) (<= 0 (+ 2147483648 |ULTIMATE.start_main_~element~0#1|)) (<= 99999 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start_main_~pos~0#1| |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0) (= |ULTIMATE.start_main_~x~0#1| 0) (<= 0 |ULTIMATE.start_main_~found~0#1|) (<= |ULTIMATE.start_main_~found~0#1| 1) (<= 2 |ULTIMATE.start_main_~#vectorx~0#1.base|) (= |ULTIMATE.start_main_#t~mem12#1| |ULTIMATE.start_main_~element~0#1|))' at error location [2023-12-02 17:30:18,568 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 17:30:18,568 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 17:30:18,568 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3, 3] total 7 [2023-12-02 17:30:18,569 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1930912295] [2023-12-02 17:30:18,569 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 17:30:18,569 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2023-12-02 17:30:18,569 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 17:30:18,570 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2023-12-02 17:30:18,571 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=64, Invalid=176, Unknown=0, NotChecked=0, Total=240 [2023-12-02 17:30:18,571 INFO L87 Difference]: Start difference. First operand 13 states and 16 transitions. Second operand has 8 states, 8 states have (on average 2.125) internal successors, (17), 7 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 17:30:18,624 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 17:30:18,624 INFO L93 Difference]: Finished difference Result 33 states and 42 transitions. [2023-12-02 17:30:18,624 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-12-02 17:30:18,625 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 2.125) internal successors, (17), 7 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 11 [2023-12-02 17:30:18,625 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 17:30:18,625 INFO L225 Difference]: With dead ends: 33 [2023-12-02 17:30:18,625 INFO L226 Difference]: Without dead ends: 23 [2023-12-02 17:30:18,626 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 20 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 78 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=64, Invalid=176, Unknown=0, NotChecked=0, Total=240 [2023-12-02 17:30:18,627 INFO L413 NwaCegarLoop]: 11 mSDtfsCounter, 7 mSDsluCounter, 35 mSDsCounter, 0 mSdLazyCounter, 52 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 46 SdHoareTripleChecker+Invalid, 54 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 52 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-12-02 17:30:18,627 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [7 Valid, 46 Invalid, 54 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 52 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-12-02 17:30:18,628 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2023-12-02 17:30:18,631 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 16. [2023-12-02 17:30:18,631 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 16 states, 15 states have (on average 1.2666666666666666) internal successors, (19), 15 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 17:30:18,632 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 19 transitions. [2023-12-02 17:30:18,632 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 19 transitions. Word has length 11 [2023-12-02 17:30:18,632 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 17:30:18,632 INFO L495 AbstractCegarLoop]: Abstraction has 16 states and 19 transitions. [2023-12-02 17:30:18,633 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 2.125) internal successors, (17), 7 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 17:30:18,633 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 19 transitions. [2023-12-02 17:30:18,633 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2023-12-02 17:30:18,633 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 17:30:18,633 INFO L195 NwaCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 17:30:18,640 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e286c196-a85b-43b5-adb4-d9d14dae5c99/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-12-02 17:30:18,836 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e286c196-a85b-43b5-adb4-d9d14dae5c99/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 17:30:18,837 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 17:30:18,837 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 17:30:18,837 INFO L85 PathProgramCache]: Analyzing trace with hash -595925711, now seen corresponding path program 2 times [2023-12-02 17:30:18,837 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 17:30:18,837 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1509011120] [2023-12-02 17:30:18,837 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 17:30:18,837 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 17:30:18,858 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 17:30:18,962 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 17:30:18,962 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 17:30:18,962 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1509011120] [2023-12-02 17:30:18,962 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1509011120] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 17:30:18,962 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1169432076] [2023-12-02 17:30:18,962 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-12-02 17:30:18,963 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 17:30:18,963 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e286c196-a85b-43b5-adb4-d9d14dae5c99/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 17:30:18,964 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e286c196-a85b-43b5-adb4-d9d14dae5c99/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 17:30:18,968 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e286c196-a85b-43b5-adb4-d9d14dae5c99/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-12-02 17:30:19,024 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2023-12-02 17:30:19,025 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 17:30:19,025 INFO L262 TraceCheckSpWp]: Trace formula consists of 86 conjuncts, 8 conjunts are in the unsatisfiable core [2023-12-02 17:30:19,027 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 17:30:19,123 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 38 treesize of output 22 [2023-12-02 17:30:19,186 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2023-12-02 17:30:19,187 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 17:30:19,246 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 42 treesize of output 26 [2023-12-02 17:30:19,315 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2023-12-02 17:30:19,315 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1169432076] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 17:30:19,315 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1954456008] [2023-12-02 17:30:19,318 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2023-12-02 17:30:19,318 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 17:30:19,318 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 17:30:19,318 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 17:30:19,318 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 17:30:19,538 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 17:30:19,750 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '411#(and (<= |ULTIMATE.start_main_~n~0#1| (+ |ULTIMATE.start_main_~i~0#1| 1)) (not (= |ULTIMATE.start_main_~found~0#1| 0)) (<= 1 |ULTIMATE.start_main_~pos~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#vectorx~0#1.base|) |ULTIMATE.start_main_~#vectorx~0#1.offset|) |ULTIMATE.start_main_#t~mem12#1|) (= |ULTIMATE.start_main_~pos~0#1| |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0) (= |ULTIMATE.start_main_~x~0#1| 0) (= |ULTIMATE.start_main_#t~mem12#1| |ULTIMATE.start_main_~element~0#1|))' at error location [2023-12-02 17:30:19,750 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 17:30:19,750 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 17:30:19,751 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 5, 5] total 14 [2023-12-02 17:30:19,751 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1019793502] [2023-12-02 17:30:19,751 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 17:30:19,751 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2023-12-02 17:30:19,751 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 17:30:19,752 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2023-12-02 17:30:19,753 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=103, Invalid=403, Unknown=0, NotChecked=0, Total=506 [2023-12-02 17:30:19,753 INFO L87 Difference]: Start difference. First operand 16 states and 19 transitions. Second operand has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 14 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 17:30:20,195 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 17:30:20,195 INFO L93 Difference]: Finished difference Result 61 states and 83 transitions. [2023-12-02 17:30:20,197 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2023-12-02 17:30:20,197 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 14 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 14 [2023-12-02 17:30:20,197 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 17:30:20,199 INFO L225 Difference]: With dead ends: 61 [2023-12-02 17:30:20,199 INFO L226 Difference]: Without dead ends: 51 [2023-12-02 17:30:20,200 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 25 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 427 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=345, Invalid=1137, Unknown=0, NotChecked=0, Total=1482 [2023-12-02 17:30:20,201 INFO L413 NwaCegarLoop]: 6 mSDtfsCounter, 38 mSDsluCounter, 42 mSDsCounter, 0 mSdLazyCounter, 129 mSolverCounterSat, 28 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 38 SdHoareTripleChecker+Valid, 48 SdHoareTripleChecker+Invalid, 157 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 28 IncrementalHoareTripleChecker+Valid, 129 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-12-02 17:30:20,201 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [38 Valid, 48 Invalid, 157 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [28 Valid, 129 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-12-02 17:30:20,202 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2023-12-02 17:30:20,210 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 32. [2023-12-02 17:30:20,210 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 32 states, 31 states have (on average 1.3225806451612903) internal successors, (41), 31 states have internal predecessors, (41), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 17:30:20,211 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 32 states to 32 states and 41 transitions. [2023-12-02 17:30:20,211 INFO L78 Accepts]: Start accepts. Automaton has 32 states and 41 transitions. Word has length 14 [2023-12-02 17:30:20,211 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 17:30:20,211 INFO L495 AbstractCegarLoop]: Abstraction has 32 states and 41 transitions. [2023-12-02 17:30:20,212 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 15 states have (on average 1.8666666666666667) internal successors, (28), 14 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 17:30:20,212 INFO L276 IsEmpty]: Start isEmpty. Operand 32 states and 41 transitions. [2023-12-02 17:30:20,212 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2023-12-02 17:30:20,212 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 17:30:20,213 INFO L195 NwaCegarLoop]: trace histogram [6, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 17:30:20,218 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e286c196-a85b-43b5-adb4-d9d14dae5c99/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Ended with exit code 0 [2023-12-02 17:30:20,413 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e286c196-a85b-43b5-adb4-d9d14dae5c99/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 17:30:20,413 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 17:30:20,414 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 17:30:20,414 INFO L85 PathProgramCache]: Analyzing trace with hash 1361672825, now seen corresponding path program 1 times [2023-12-02 17:30:20,414 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 17:30:20,414 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1718988355] [2023-12-02 17:30:20,414 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 17:30:20,414 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 17:30:20,433 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 17:30:20,552 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-12-02 17:30:20,552 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 17:30:20,552 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1718988355] [2023-12-02 17:30:20,553 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1718988355] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 17:30:20,553 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [542411182] [2023-12-02 17:30:20,553 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 17:30:20,553 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 17:30:20,553 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e286c196-a85b-43b5-adb4-d9d14dae5c99/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 17:30:20,554 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e286c196-a85b-43b5-adb4-d9d14dae5c99/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 17:30:20,556 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e286c196-a85b-43b5-adb4-d9d14dae5c99/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-12-02 17:30:20,619 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 17:30:20,620 INFO L262 TraceCheckSpWp]: Trace formula consists of 135 conjuncts, 9 conjunts are in the unsatisfiable core [2023-12-02 17:30:20,622 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 17:30:20,705 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-12-02 17:30:20,705 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 17:30:20,805 INFO L134 CoverageAnalysis]: Checked inductivity of 25 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-12-02 17:30:20,805 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [542411182] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 17:30:20,805 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1567443111] [2023-12-02 17:30:20,808 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2023-12-02 17:30:20,808 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 17:30:20,808 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 17:30:20,808 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 17:30:20,809 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 17:30:20,974 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 17:30:21,125 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '724#(and (<= |ULTIMATE.start_main_~n~0#1| (+ |ULTIMATE.start_main_~i~0#1| 1)) (not (= |ULTIMATE.start_main_~found~0#1| 0)) (<= 1 |ULTIMATE.start_main_~pos~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#vectorx~0#1.base|) |ULTIMATE.start_main_~#vectorx~0#1.offset|) |ULTIMATE.start_main_#t~mem12#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0) (= |ULTIMATE.start_main_~x~0#1| 0) (= |ULTIMATE.start_main_#t~mem12#1| |ULTIMATE.start_main_~element~0#1|))' at error location [2023-12-02 17:30:21,125 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 17:30:21,125 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 17:30:21,125 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8, 8] total 22 [2023-12-02 17:30:21,125 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [626422358] [2023-12-02 17:30:21,125 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 17:30:21,126 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2023-12-02 17:30:21,126 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 17:30:21,127 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2023-12-02 17:30:21,127 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=261, Invalid=609, Unknown=0, NotChecked=0, Total=870 [2023-12-02 17:30:21,127 INFO L87 Difference]: Start difference. First operand 32 states and 41 transitions. Second operand has 23 states, 23 states have (on average 1.434782608695652) internal successors, (33), 22 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 17:30:21,185 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 17:30:21,185 INFO L93 Difference]: Finished difference Result 72 states and 98 transitions. [2023-12-02 17:30:21,185 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2023-12-02 17:30:21,185 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 1.434782608695652) internal successors, (33), 22 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 18 [2023-12-02 17:30:21,186 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 17:30:21,186 INFO L225 Difference]: With dead ends: 72 [2023-12-02 17:30:21,186 INFO L226 Difference]: Without dead ends: 48 [2023-12-02 17:30:21,187 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 32 SyntacticMatches, 0 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 409 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=261, Invalid=609, Unknown=0, NotChecked=0, Total=870 [2023-12-02 17:30:21,188 INFO L413 NwaCegarLoop]: 6 mSDtfsCounter, 7 mSDsluCounter, 25 mSDsCounter, 0 mSdLazyCounter, 57 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 31 SdHoareTripleChecker+Invalid, 59 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 57 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-12-02 17:30:21,188 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [7 Valid, 31 Invalid, 59 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 57 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-12-02 17:30:21,189 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 48 states. [2023-12-02 17:30:21,197 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 48 to 40. [2023-12-02 17:30:21,197 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40 states, 39 states have (on average 1.2564102564102564) internal successors, (49), 39 states have internal predecessors, (49), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 17:30:21,198 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 49 transitions. [2023-12-02 17:30:21,198 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 49 transitions. Word has length 18 [2023-12-02 17:30:21,198 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 17:30:21,198 INFO L495 AbstractCegarLoop]: Abstraction has 40 states and 49 transitions. [2023-12-02 17:30:21,199 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 23 states have (on average 1.434782608695652) internal successors, (33), 22 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 17:30:21,199 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 49 transitions. [2023-12-02 17:30:21,199 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2023-12-02 17:30:21,200 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 17:30:21,200 INFO L195 NwaCegarLoop]: trace histogram [14, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 17:30:21,204 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e286c196-a85b-43b5-adb4-d9d14dae5c99/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Ended with exit code 0 [2023-12-02 17:30:21,400 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e286c196-a85b-43b5-adb4-d9d14dae5c99/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2023-12-02 17:30:21,400 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 17:30:21,401 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 17:30:21,401 INFO L85 PathProgramCache]: Analyzing trace with hash -1020500487, now seen corresponding path program 2 times [2023-12-02 17:30:21,401 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 17:30:21,401 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1133629135] [2023-12-02 17:30:21,401 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 17:30:21,401 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 17:30:21,431 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 17:30:21,779 INFO L134 CoverageAnalysis]: Checked inductivity of 109 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-12-02 17:30:21,780 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 17:30:21,780 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1133629135] [2023-12-02 17:30:21,780 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1133629135] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 17:30:21,780 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [402151] [2023-12-02 17:30:21,780 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-12-02 17:30:21,780 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 17:30:21,780 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e286c196-a85b-43b5-adb4-d9d14dae5c99/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 17:30:21,781 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e286c196-a85b-43b5-adb4-d9d14dae5c99/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 17:30:21,784 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e286c196-a85b-43b5-adb4-d9d14dae5c99/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-12-02 17:30:21,863 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2023-12-02 17:30:21,863 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 17:30:21,864 INFO L262 TraceCheckSpWp]: Trace formula consists of 99 conjuncts, 10 conjunts are in the unsatisfiable core [2023-12-02 17:30:21,866 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 17:30:21,930 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 38 treesize of output 22 [2023-12-02 17:30:21,988 INFO L134 CoverageAnalysis]: Checked inductivity of 109 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 105 trivial. 0 not checked. [2023-12-02 17:30:21,988 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 17:30:22,118 INFO L134 CoverageAnalysis]: Checked inductivity of 109 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 105 trivial. 0 not checked. [2023-12-02 17:30:22,118 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [402151] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 17:30:22,118 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1771768052] [2023-12-02 17:30:22,121 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2023-12-02 17:30:22,121 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 17:30:22,121 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 17:30:22,121 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 17:30:22,121 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 17:30:22,346 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 17:30:22,555 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1101#(and (<= |ULTIMATE.start_main_~n~0#1| (+ |ULTIMATE.start_main_~i~0#1| 1)) (not (= |ULTIMATE.start_main_~found~0#1| 0)) (<= 1 |ULTIMATE.start_main_~pos~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#vectorx~0#1.base|) |ULTIMATE.start_main_~#vectorx~0#1.offset|) |ULTIMATE.start_main_#t~mem12#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0) (= |ULTIMATE.start_main_~x~0#1| 0) (= |ULTIMATE.start_main_#t~mem12#1| |ULTIMATE.start_main_~element~0#1|))' at error location [2023-12-02 17:30:22,555 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 17:30:22,555 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 17:30:22,555 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 6, 6] total 26 [2023-12-02 17:30:22,555 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [573591669] [2023-12-02 17:30:22,555 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 17:30:22,556 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2023-12-02 17:30:22,556 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 17:30:22,557 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2023-12-02 17:30:22,558 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=299, Invalid=823, Unknown=0, NotChecked=0, Total=1122 [2023-12-02 17:30:22,558 INFO L87 Difference]: Start difference. First operand 40 states and 49 transitions. Second operand has 27 states, 27 states have (on average 1.5925925925925926) internal successors, (43), 26 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 17:30:23,653 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 17:30:23,653 INFO L93 Difference]: Finished difference Result 128 states and 180 transitions. [2023-12-02 17:30:23,653 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2023-12-02 17:30:23,654 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 27 states have (on average 1.5925925925925926) internal successors, (43), 26 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 26 [2023-12-02 17:30:23,654 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 17:30:23,655 INFO L225 Difference]: With dead ends: 128 [2023-12-02 17:30:23,655 INFO L226 Difference]: Without dead ends: 104 [2023-12-02 17:30:23,658 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 126 GetRequests, 60 SyntacticMatches, 0 SemanticMatches, 66 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1186 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=1243, Invalid=3313, Unknown=0, NotChecked=0, Total=4556 [2023-12-02 17:30:23,659 INFO L413 NwaCegarLoop]: 6 mSDtfsCounter, 209 mSDsluCounter, 30 mSDsCounter, 0 mSdLazyCounter, 151 mSolverCounterSat, 92 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 209 SdHoareTripleChecker+Valid, 36 SdHoareTripleChecker+Invalid, 243 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 92 IncrementalHoareTripleChecker+Valid, 151 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-12-02 17:30:23,659 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [209 Valid, 36 Invalid, 243 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [92 Valid, 151 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-12-02 17:30:23,660 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 104 states. [2023-12-02 17:30:23,674 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 104 to 66. [2023-12-02 17:30:23,675 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 66 states, 65 states have (on average 1.323076923076923) internal successors, (86), 65 states have internal predecessors, (86), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 17:30:23,676 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 86 transitions. [2023-12-02 17:30:23,676 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 86 transitions. Word has length 26 [2023-12-02 17:30:23,676 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 17:30:23,676 INFO L495 AbstractCegarLoop]: Abstraction has 66 states and 86 transitions. [2023-12-02 17:30:23,677 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 27 states have (on average 1.5925925925925926) internal successors, (43), 26 states have internal predecessors, (43), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 17:30:23,677 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 86 transitions. [2023-12-02 17:30:23,678 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2023-12-02 17:30:23,678 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 17:30:23,678 INFO L195 NwaCegarLoop]: trace histogram [18, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 17:30:23,682 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e286c196-a85b-43b5-adb4-d9d14dae5c99/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2023-12-02 17:30:23,880 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e286c196-a85b-43b5-adb4-d9d14dae5c99/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 17:30:23,880 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 17:30:23,881 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 17:30:23,881 INFO L85 PathProgramCache]: Analyzing trace with hash 1403001041, now seen corresponding path program 3 times [2023-12-02 17:30:23,881 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 17:30:23,881 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1013898229] [2023-12-02 17:30:23,881 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 17:30:23,881 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 17:30:23,910 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 17:30:24,396 INFO L134 CoverageAnalysis]: Checked inductivity of 180 backedges. 0 proven. 171 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2023-12-02 17:30:24,396 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 17:30:24,396 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1013898229] [2023-12-02 17:30:24,396 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1013898229] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 17:30:24,396 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1981640090] [2023-12-02 17:30:24,397 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-12-02 17:30:24,397 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 17:30:24,397 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e286c196-a85b-43b5-adb4-d9d14dae5c99/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 17:30:24,398 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e286c196-a85b-43b5-adb4-d9d14dae5c99/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 17:30:24,400 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e286c196-a85b-43b5-adb4-d9d14dae5c99/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-12-02 17:30:24,476 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-12-02 17:30:24,476 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 17:30:24,478 WARN L260 TraceCheckSpWp]: Trace formula consists of 55 conjuncts, 30 conjunts are in the unsatisfiable core [2023-12-02 17:30:24,484 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 17:30:24,638 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-12-02 17:30:24,638 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 37 treesize of output 33 [2023-12-02 17:30:24,708 INFO L349 Elim1Store]: treesize reduction 74, result has 28.8 percent of original size [2023-12-02 17:30:24,708 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 9 case distinctions, treesize of input 48 treesize of output 60 [2023-12-02 17:30:26,910 INFO L134 CoverageAnalysis]: Checked inductivity of 180 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 171 trivial. 0 not checked. [2023-12-02 17:30:26,910 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 17:30:27,391 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 133 treesize of output 113 [2023-12-02 17:30:27,434 INFO L349 Elim1Store]: treesize reduction 35, result has 49.3 percent of original size [2023-12-02 17:30:27,435 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 5 select indices, 5 select index equivalence classes, 0 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 10 case distinctions, treesize of input 672 treesize of output 401 [2023-12-02 17:30:27,560 INFO L134 CoverageAnalysis]: Checked inductivity of 180 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 171 trivial. 0 not checked. [2023-12-02 17:30:27,561 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1981640090] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 17:30:27,561 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [266921961] [2023-12-02 17:30:27,563 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2023-12-02 17:30:27,563 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 17:30:27,563 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 17:30:27,563 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 17:30:27,563 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 17:30:27,796 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 17:30:28,119 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1737#(and (<= |ULTIMATE.start_main_~n~0#1| (+ |ULTIMATE.start_main_~i~0#1| 1)) (not (= |ULTIMATE.start_main_~found~0#1| 0)) (<= 1 |ULTIMATE.start_main_~pos~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#vectorx~0#1.base|) |ULTIMATE.start_main_~#vectorx~0#1.offset|) |ULTIMATE.start_main_#t~mem12#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0) (= |ULTIMATE.start_main_~x~0#1| 0) (= |ULTIMATE.start_main_#t~mem12#1| |ULTIMATE.start_main_~element~0#1|))' at error location [2023-12-02 17:30:28,119 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 17:30:28,119 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 17:30:28,119 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [20, 11, 11] total 38 [2023-12-02 17:30:28,119 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1536296911] [2023-12-02 17:30:28,120 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 17:30:28,120 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 38 states [2023-12-02 17:30:28,120 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 17:30:28,121 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2023-12-02 17:30:28,122 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=304, Invalid=1675, Unknown=1, NotChecked=0, Total=1980 [2023-12-02 17:30:28,123 INFO L87 Difference]: Start difference. First operand 66 states and 86 transitions. Second operand has 38 states, 38 states have (on average 1.4210526315789473) internal successors, (54), 38 states have internal predecessors, (54), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 17:30:30,160 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 1.41s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-12-02 17:30:35,385 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 17:30:35,385 INFO L93 Difference]: Finished difference Result 165 states and 211 transitions. [2023-12-02 17:30:35,385 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2023-12-02 17:30:35,386 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 38 states have (on average 1.4210526315789473) internal successors, (54), 38 states have internal predecessors, (54), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 32 [2023-12-02 17:30:35,386 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 17:30:35,387 INFO L225 Difference]: With dead ends: 165 [2023-12-02 17:30:35,387 INFO L226 Difference]: Without dead ends: 119 [2023-12-02 17:30:35,389 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 132 GetRequests, 71 SyntacticMatches, 0 SemanticMatches, 61 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 816 ImplicationChecksByTransitivity, 8.5s TimeCoverageRelationStatistics Valid=548, Invalid=3355, Unknown=3, NotChecked=0, Total=3906 [2023-12-02 17:30:35,390 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 154 mSDsluCounter, 40 mSDsCounter, 0 mSdLazyCounter, 311 mSolverCounterSat, 25 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 154 SdHoareTripleChecker+Valid, 42 SdHoareTripleChecker+Invalid, 337 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 25 IncrementalHoareTripleChecker+Valid, 311 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.9s IncrementalHoareTripleChecker+Time [2023-12-02 17:30:35,390 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [154 Valid, 42 Invalid, 337 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [25 Valid, 311 Invalid, 1 Unknown, 0 Unchecked, 1.9s Time] [2023-12-02 17:30:35,391 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 119 states. [2023-12-02 17:30:35,438 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 119 to 89. [2023-12-02 17:30:35,439 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 89 states, 88 states have (on average 1.25) internal successors, (110), 88 states have internal predecessors, (110), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 17:30:35,440 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 110 transitions. [2023-12-02 17:30:35,440 INFO L78 Accepts]: Start accepts. Automaton has 89 states and 110 transitions. Word has length 32 [2023-12-02 17:30:35,440 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 17:30:35,440 INFO L495 AbstractCegarLoop]: Abstraction has 89 states and 110 transitions. [2023-12-02 17:30:35,441 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 38 states, 38 states have (on average 1.4210526315789473) internal successors, (54), 38 states have internal predecessors, (54), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 17:30:35,441 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 110 transitions. [2023-12-02 17:30:35,442 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 37 [2023-12-02 17:30:35,442 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 17:30:35,442 INFO L195 NwaCegarLoop]: trace histogram [19, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 17:30:35,447 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e286c196-a85b-43b5-adb4-d9d14dae5c99/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Ended with exit code 0 [2023-12-02 17:30:35,643 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e286c196-a85b-43b5-adb4-d9d14dae5c99/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 17:30:35,643 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 17:30:35,643 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 17:30:35,643 INFO L85 PathProgramCache]: Analyzing trace with hash 1401626412, now seen corresponding path program 1 times [2023-12-02 17:30:35,643 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 17:30:35,643 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1636801704] [2023-12-02 17:30:35,644 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 17:30:35,644 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 17:30:35,672 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 17:30:36,129 INFO L134 CoverageAnalysis]: Checked inductivity of 201 backedges. 0 proven. 190 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2023-12-02 17:30:36,129 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 17:30:36,129 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1636801704] [2023-12-02 17:30:36,129 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1636801704] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 17:30:36,129 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2126929848] [2023-12-02 17:30:36,130 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 17:30:36,130 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 17:30:36,130 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e286c196-a85b-43b5-adb4-d9d14dae5c99/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 17:30:36,131 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e286c196-a85b-43b5-adb4-d9d14dae5c99/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 17:30:36,136 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e286c196-a85b-43b5-adb4-d9d14dae5c99/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2023-12-02 17:30:36,233 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 17:30:36,235 INFO L262 TraceCheckSpWp]: Trace formula consists of 275 conjuncts, 22 conjunts are in the unsatisfiable core [2023-12-02 17:30:36,237 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 17:30:36,534 INFO L134 CoverageAnalysis]: Checked inductivity of 201 backedges. 0 proven. 190 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2023-12-02 17:30:36,534 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 17:30:37,120 INFO L134 CoverageAnalysis]: Checked inductivity of 201 backedges. 0 proven. 190 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2023-12-02 17:30:37,120 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2126929848] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 17:30:37,120 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [137527508] [2023-12-02 17:30:37,122 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2023-12-02 17:30:37,122 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 17:30:37,122 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 17:30:37,122 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 17:30:37,122 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 17:30:37,291 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 17:30:37,521 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2508#(and (<= 0 |ULTIMATE.start_main_~x~0#1|) (<= 1 |ULTIMATE.start_main_~pos~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 1) (<= 0 |ULTIMATE.start___VERIFIER_assert_#in~cond#1|))' at error location [2023-12-02 17:30:37,521 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 17:30:37,524 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 17:30:37,524 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 21] total 61 [2023-12-02 17:30:37,524 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [418118813] [2023-12-02 17:30:37,525 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 17:30:37,525 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 62 states [2023-12-02 17:30:37,525 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 17:30:37,527 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 62 interpolants. [2023-12-02 17:30:37,529 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1741, Invalid=3089, Unknown=0, NotChecked=0, Total=4830 [2023-12-02 17:30:37,530 INFO L87 Difference]: Start difference. First operand 89 states and 110 transitions. Second operand has 62 states, 62 states have (on average 1.1935483870967742) internal successors, (74), 61 states have internal predecessors, (74), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 17:30:37,652 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 17:30:37,652 INFO L93 Difference]: Finished difference Result 188 states and 251 transitions. [2023-12-02 17:30:37,652 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2023-12-02 17:30:37,653 INFO L78 Accepts]: Start accepts. Automaton has has 62 states, 62 states have (on average 1.1935483870967742) internal successors, (74), 61 states have internal predecessors, (74), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 36 [2023-12-02 17:30:37,653 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 17:30:37,654 INFO L225 Difference]: With dead ends: 188 [2023-12-02 17:30:37,654 INFO L226 Difference]: Without dead ends: 120 [2023-12-02 17:30:37,656 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 127 GetRequests, 59 SyntacticMatches, 0 SemanticMatches, 68 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2330 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=1741, Invalid=3089, Unknown=0, NotChecked=0, Total=4830 [2023-12-02 17:30:37,657 INFO L413 NwaCegarLoop]: 6 mSDtfsCounter, 7 mSDsluCounter, 25 mSDsCounter, 0 mSdLazyCounter, 96 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 31 SdHoareTripleChecker+Invalid, 98 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 96 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 17:30:37,657 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [7 Valid, 31 Invalid, 98 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 96 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 17:30:37,658 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 120 states. [2023-12-02 17:30:37,687 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 120 to 110. [2023-12-02 17:30:37,688 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 110 states, 109 states have (on average 1.201834862385321) internal successors, (131), 109 states have internal predecessors, (131), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 17:30:37,689 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 110 states to 110 states and 131 transitions. [2023-12-02 17:30:37,689 INFO L78 Accepts]: Start accepts. Automaton has 110 states and 131 transitions. Word has length 36 [2023-12-02 17:30:37,689 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 17:30:37,689 INFO L495 AbstractCegarLoop]: Abstraction has 110 states and 131 transitions. [2023-12-02 17:30:37,690 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 62 states, 62 states have (on average 1.1935483870967742) internal successors, (74), 61 states have internal predecessors, (74), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 17:30:37,690 INFO L276 IsEmpty]: Start isEmpty. Operand 110 states and 131 transitions. [2023-12-02 17:30:37,692 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 58 [2023-12-02 17:30:37,692 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 17:30:37,692 INFO L195 NwaCegarLoop]: trace histogram [40, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 17:30:37,698 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e286c196-a85b-43b5-adb4-d9d14dae5c99/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Ended with exit code 0 [2023-12-02 17:30:37,894 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e286c196-a85b-43b5-adb4-d9d14dae5c99/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 17:30:37,894 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 17:30:37,895 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 17:30:37,895 INFO L85 PathProgramCache]: Analyzing trace with hash 1645679395, now seen corresponding path program 2 times [2023-12-02 17:30:37,895 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 17:30:37,895 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1259650307] [2023-12-02 17:30:37,895 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 17:30:37,895 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 17:30:37,936 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 17:30:39,161 INFO L134 CoverageAnalysis]: Checked inductivity of 831 backedges. 0 proven. 820 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2023-12-02 17:30:39,161 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 17:30:39,161 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1259650307] [2023-12-02 17:30:39,161 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1259650307] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 17:30:39,161 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1530286764] [2023-12-02 17:30:39,161 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-12-02 17:30:39,161 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 17:30:39,161 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e286c196-a85b-43b5-adb4-d9d14dae5c99/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 17:30:39,162 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e286c196-a85b-43b5-adb4-d9d14dae5c99/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 17:30:39,164 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e286c196-a85b-43b5-adb4-d9d14dae5c99/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2023-12-02 17:30:39,289 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2023-12-02 17:30:39,290 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 17:30:39,291 INFO L262 TraceCheckSpWp]: Trace formula consists of 140 conjuncts, 12 conjunts are in the unsatisfiable core [2023-12-02 17:30:39,294 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 17:30:39,396 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 38 treesize of output 22 [2023-12-02 17:30:39,562 INFO L134 CoverageAnalysis]: Checked inductivity of 831 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 822 trivial. 0 not checked. [2023-12-02 17:30:39,562 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 17:30:39,876 INFO L134 CoverageAnalysis]: Checked inductivity of 831 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 822 trivial. 0 not checked. [2023-12-02 17:30:39,876 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1530286764] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 17:30:39,876 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [844149474] [2023-12-02 17:30:39,878 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2023-12-02 17:30:39,878 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 17:30:39,878 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 17:30:39,878 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 17:30:39,878 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 17:30:40,059 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 17:30:40,382 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3467#(and (<= 0 |ULTIMATE.start_main_~x~0#1|) (<= 1 |ULTIMATE.start_main_~pos~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 1) (<= 0 |ULTIMATE.start___VERIFIER_assert_#in~cond#1|))' at error location [2023-12-02 17:30:40,382 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 17:30:40,382 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 17:30:40,382 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [42, 10, 10] total 59 [2023-12-02 17:30:40,382 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [730728746] [2023-12-02 17:30:40,383 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 17:30:40,383 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 60 states [2023-12-02 17:30:40,383 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 17:30:40,384 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 60 interpolants. [2023-12-02 17:30:40,386 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1407, Invalid=3149, Unknown=0, NotChecked=0, Total=4556 [2023-12-02 17:30:40,386 INFO L87 Difference]: Start difference. First operand 110 states and 131 transitions. Second operand has 60 states, 60 states have (on average 1.2666666666666666) internal successors, (76), 59 states have internal predecessors, (76), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 17:30:46,953 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 17:30:46,953 INFO L93 Difference]: Finished difference Result 346 states and 492 transitions. [2023-12-02 17:30:46,953 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 137 states. [2023-12-02 17:30:46,953 INFO L78 Accepts]: Start accepts. Automaton has has 60 states, 60 states have (on average 1.2666666666666666) internal successors, (76), 59 states have internal predecessors, (76), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 57 [2023-12-02 17:30:46,954 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 17:30:46,955 INFO L225 Difference]: With dead ends: 346 [2023-12-02 17:30:46,955 INFO L226 Difference]: Without dead ends: 276 [2023-12-02 17:30:46,966 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 344 GetRequests, 145 SyntacticMatches, 0 SemanticMatches, 199 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11416 ImplicationChecksByTransitivity, 7.2s TimeCoverageRelationStatistics Valid=11665, Invalid=28535, Unknown=0, NotChecked=0, Total=40200 [2023-12-02 17:30:46,967 INFO L413 NwaCegarLoop]: 6 mSDtfsCounter, 591 mSDsluCounter, 18 mSDsCounter, 0 mSdLazyCounter, 269 mSolverCounterSat, 373 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 591 SdHoareTripleChecker+Valid, 24 SdHoareTripleChecker+Invalid, 642 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 373 IncrementalHoareTripleChecker+Valid, 269 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-12-02 17:30:46,967 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [591 Valid, 24 Invalid, 642 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [373 Valid, 269 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2023-12-02 17:30:46,968 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 276 states. [2023-12-02 17:30:47,037 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 276 to 195. [2023-12-02 17:30:47,037 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 195 states, 194 states have (on average 1.2525773195876289) internal successors, (243), 194 states have internal predecessors, (243), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 17:30:47,038 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 195 states to 195 states and 243 transitions. [2023-12-02 17:30:47,038 INFO L78 Accepts]: Start accepts. Automaton has 195 states and 243 transitions. Word has length 57 [2023-12-02 17:30:47,038 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 17:30:47,038 INFO L495 AbstractCegarLoop]: Abstraction has 195 states and 243 transitions. [2023-12-02 17:30:47,039 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 60 states, 60 states have (on average 1.2666666666666666) internal successors, (76), 59 states have internal predecessors, (76), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 17:30:47,039 INFO L276 IsEmpty]: Start isEmpty. Operand 195 states and 243 transitions. [2023-12-02 17:30:47,040 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 64 [2023-12-02 17:30:47,040 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 17:30:47,040 INFO L195 NwaCegarLoop]: trace histogram [44, 4, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 17:30:47,045 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e286c196-a85b-43b5-adb4-d9d14dae5c99/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Ended with exit code 0 [2023-12-02 17:30:47,241 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e286c196-a85b-43b5-adb4-d9d14dae5c99/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2023-12-02 17:30:47,241 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 17:30:47,241 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 17:30:47,241 INFO L85 PathProgramCache]: Analyzing trace with hash 529848315, now seen corresponding path program 3 times [2023-12-02 17:30:47,241 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 17:30:47,241 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1414019919] [2023-12-02 17:30:47,242 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 17:30:47,242 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 17:30:47,283 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 17:30:48,766 INFO L134 CoverageAnalysis]: Checked inductivity of 1008 backedges. 0 proven. 990 refuted. 0 times theorem prover too weak. 18 trivial. 0 not checked. [2023-12-02 17:30:48,767 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 17:30:48,767 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1414019919] [2023-12-02 17:30:48,767 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1414019919] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 17:30:48,767 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [597369629] [2023-12-02 17:30:48,767 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-12-02 17:30:48,767 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 17:30:48,767 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e286c196-a85b-43b5-adb4-d9d14dae5c99/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 17:30:48,768 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e286c196-a85b-43b5-adb4-d9d14dae5c99/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 17:30:48,769 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e286c196-a85b-43b5-adb4-d9d14dae5c99/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2023-12-02 17:30:48,875 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-12-02 17:30:48,875 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 17:30:48,877 WARN L260 TraceCheckSpWp]: Trace formula consists of 78 conjuncts, 39 conjunts are in the unsatisfiable core [2023-12-02 17:30:48,880 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 17:30:49,121 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-12-02 17:30:49,121 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 39 treesize of output 35 [2023-12-02 17:30:49,201 INFO L349 Elim1Store]: treesize reduction 74, result has 30.2 percent of original size [2023-12-02 17:30:49,201 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 9 case distinctions, treesize of input 50 treesize of output 62 [2023-12-02 17:30:49,404 INFO L349 Elim1Store]: treesize reduction 201, result has 30.9 percent of original size [2023-12-02 17:30:49,404 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 7 select indices, 7 select index equivalence classes, 0 disjoint index pairs (out of 21 index pairs), introduced 7 new quantified variables, introduced 27 case distinctions, treesize of input 99 treesize of output 140 [2023-12-02 17:30:54,018 INFO L134 CoverageAnalysis]: Checked inductivity of 1008 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 990 trivial. 0 not checked. [2023-12-02 17:30:54,019 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 17:30:59,083 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 156 treesize of output 134 [2023-12-02 17:30:59,135 INFO L349 Elim1Store]: treesize reduction 73, result has 35.4 percent of original size [2023-12-02 17:30:59,135 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 6 select indices, 6 select index equivalence classes, 0 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 15 case distinctions, treesize of input 1865 treesize of output 1057 [2023-12-02 17:30:59,282 INFO L134 CoverageAnalysis]: Checked inductivity of 1008 backedges. 1 proven. 17 refuted. 0 times theorem prover too weak. 990 trivial. 0 not checked. [2023-12-02 17:30:59,283 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [597369629] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 17:30:59,283 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2104494892] [2023-12-02 17:30:59,284 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2023-12-02 17:30:59,284 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 17:30:59,285 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 17:30:59,285 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 17:30:59,285 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 17:30:59,457 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 17:30:59,962 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5174#(and (<= 0 |ULTIMATE.start_main_~x~0#1|) (<= 1 |ULTIMATE.start_main_~pos~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 1) (<= 0 |ULTIMATE.start___VERIFIER_assert_#in~cond#1|))' at error location [2023-12-02 17:30:59,962 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 17:30:59,962 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 17:30:59,962 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [46, 14, 14] total 69 [2023-12-02 17:30:59,962 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1599423137] [2023-12-02 17:30:59,962 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 17:30:59,963 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 69 states [2023-12-02 17:30:59,963 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 17:30:59,964 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 69 interpolants. [2023-12-02 17:30:59,964 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1199, Invalid=4649, Unknown=4, NotChecked=0, Total=5852 [2023-12-02 17:30:59,965 INFO L87 Difference]: Start difference. First operand 195 states and 243 transitions. Second operand has 69 states, 69 states have (on average 1.318840579710145) internal successors, (91), 69 states have internal predecessors, (91), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 17:31:03,302 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-12-02 17:31:07,470 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0, 1] [2023-12-02 17:31:17,229 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 17:31:17,229 INFO L93 Difference]: Finished difference Result 434 states and 536 transitions. [2023-12-02 17:31:17,229 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 75 states. [2023-12-02 17:31:17,229 INFO L78 Accepts]: Start accepts. Automaton has has 69 states, 69 states have (on average 1.318840579710145) internal successors, (91), 69 states have internal predecessors, (91), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 63 [2023-12-02 17:31:17,230 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 17:31:17,231 INFO L225 Difference]: With dead ends: 434 [2023-12-02 17:31:17,232 INFO L226 Difference]: Without dead ends: 285 [2023-12-02 17:31:17,233 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 259 GetRequests, 158 SyntacticMatches, 0 SemanticMatches, 101 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1963 ImplicationChecksByTransitivity, 22.7s TimeCoverageRelationStatistics Valid=1646, Invalid=8852, Unknown=8, NotChecked=0, Total=10506 [2023-12-02 17:31:17,233 INFO L413 NwaCegarLoop]: 4 mSDtfsCounter, 134 mSDsluCounter, 78 mSDsCounter, 0 mSdLazyCounter, 585 mSolverCounterSat, 24 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 5.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 134 SdHoareTripleChecker+Valid, 82 SdHoareTripleChecker+Invalid, 611 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 24 IncrementalHoareTripleChecker+Valid, 585 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 5.2s IncrementalHoareTripleChecker+Time [2023-12-02 17:31:17,233 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [134 Valid, 82 Invalid, 611 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [24 Valid, 585 Invalid, 2 Unknown, 0 Unchecked, 5.2s Time] [2023-12-02 17:31:17,234 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 285 states. [2023-12-02 17:31:17,354 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 285 to 246. [2023-12-02 17:31:17,354 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 246 states, 245 states have (on average 1.2040816326530612) internal successors, (295), 245 states have internal predecessors, (295), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 17:31:17,355 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 246 states to 246 states and 295 transitions. [2023-12-02 17:31:17,355 INFO L78 Accepts]: Start accepts. Automaton has 246 states and 295 transitions. Word has length 63 [2023-12-02 17:31:17,355 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 17:31:17,356 INFO L495 AbstractCegarLoop]: Abstraction has 246 states and 295 transitions. [2023-12-02 17:31:17,356 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 69 states, 69 states have (on average 1.318840579710145) internal successors, (91), 69 states have internal predecessors, (91), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 17:31:17,356 INFO L276 IsEmpty]: Start isEmpty. Operand 246 states and 295 transitions. [2023-12-02 17:31:17,357 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 68 [2023-12-02 17:31:17,357 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 17:31:17,357 INFO L195 NwaCegarLoop]: trace histogram [45, 4, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 17:31:17,361 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e286c196-a85b-43b5-adb4-d9d14dae5c99/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Ended with exit code 0 [2023-12-02 17:31:17,557 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e286c196-a85b-43b5-adb4-d9d14dae5c99/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 17:31:17,558 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 17:31:17,558 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 17:31:17,558 INFO L85 PathProgramCache]: Analyzing trace with hash -583237168, now seen corresponding path program 4 times [2023-12-02 17:31:17,558 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 17:31:17,558 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [209245826] [2023-12-02 17:31:17,558 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 17:31:17,558 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 17:31:17,601 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 17:31:19,296 INFO L134 CoverageAnalysis]: Checked inductivity of 1058 backedges. 0 proven. 1035 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2023-12-02 17:31:19,296 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 17:31:19,296 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [209245826] [2023-12-02 17:31:19,296 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [209245826] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 17:31:19,296 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [887922445] [2023-12-02 17:31:19,296 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-12-02 17:31:19,297 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 17:31:19,297 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e286c196-a85b-43b5-adb4-d9d14dae5c99/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 17:31:19,297 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e286c196-a85b-43b5-adb4-d9d14dae5c99/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 17:31:19,298 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e286c196-a85b-43b5-adb4-d9d14dae5c99/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2023-12-02 17:31:19,451 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 17:31:19,454 INFO L262 TraceCheckSpWp]: Trace formula consists of 532 conjuncts, 48 conjunts are in the unsatisfiable core [2023-12-02 17:31:19,456 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 17:31:20,581 INFO L134 CoverageAnalysis]: Checked inductivity of 1058 backedges. 0 proven. 1035 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2023-12-02 17:31:20,581 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 17:31:23,213 INFO L134 CoverageAnalysis]: Checked inductivity of 1058 backedges. 0 proven. 1035 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2023-12-02 17:31:23,213 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [887922445] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 17:31:23,214 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [377112555] [2023-12-02 17:31:23,216 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2023-12-02 17:31:23,216 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 17:31:23,216 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 17:31:23,216 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 17:31:23,216 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 17:31:23,372 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 17:31:23,719 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '7062#(and (<= 0 |ULTIMATE.start_main_~x~0#1|) (<= 1 |ULTIMATE.start_main_~pos~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 1) (<= 0 |ULTIMATE.start___VERIFIER_assert_#in~cond#1|))' at error location [2023-12-02 17:31:23,719 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 17:31:23,719 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 17:31:23,719 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [47, 47, 47] total 139 [2023-12-02 17:31:23,720 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [53197072] [2023-12-02 17:31:23,720 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 17:31:23,720 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 140 states [2023-12-02 17:31:23,720 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 17:31:23,722 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 140 interpolants. [2023-12-02 17:31:23,724 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8761, Invalid=12995, Unknown=0, NotChecked=0, Total=21756 [2023-12-02 17:31:23,724 INFO L87 Difference]: Start difference. First operand 246 states and 295 transitions. Second operand has 140 states, 140 states have (on average 1.0857142857142856) internal successors, (152), 139 states have internal predecessors, (152), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 17:31:24,062 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 17:31:24,062 INFO L93 Difference]: Finished difference Result 505 states and 650 transitions. [2023-12-02 17:31:24,062 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 94 states. [2023-12-02 17:31:24,063 INFO L78 Accepts]: Start accepts. Automaton has has 140 states, 140 states have (on average 1.0857142857142856) internal successors, (152), 139 states have internal predecessors, (152), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 67 [2023-12-02 17:31:24,063 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 17:31:24,065 INFO L225 Difference]: With dead ends: 505 [2023-12-02 17:31:24,065 INFO L226 Difference]: Without dead ends: 306 [2023-12-02 17:31:24,067 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 246 GetRequests, 100 SyntacticMatches, 0 SemanticMatches, 146 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10156 ImplicationChecksByTransitivity, 4.8s TimeCoverageRelationStatistics Valid=8761, Invalid=12995, Unknown=0, NotChecked=0, Total=21756 [2023-12-02 17:31:24,068 INFO L413 NwaCegarLoop]: 6 mSDtfsCounter, 7 mSDsluCounter, 15 mSDsCounter, 0 mSdLazyCounter, 146 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 21 SdHoareTripleChecker+Invalid, 148 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 146 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 17:31:24,068 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [7 Valid, 21 Invalid, 148 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 146 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 17:31:24,069 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 306 states. [2023-12-02 17:31:24,198 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 306 to 293. [2023-12-02 17:31:24,199 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 293 states, 292 states have (on average 1.1712328767123288) internal successors, (342), 292 states have internal predecessors, (342), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 17:31:24,200 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 293 states to 293 states and 342 transitions. [2023-12-02 17:31:24,200 INFO L78 Accepts]: Start accepts. Automaton has 293 states and 342 transitions. Word has length 67 [2023-12-02 17:31:24,200 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 17:31:24,200 INFO L495 AbstractCegarLoop]: Abstraction has 293 states and 342 transitions. [2023-12-02 17:31:24,200 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 140 states, 140 states have (on average 1.0857142857142856) internal successors, (152), 139 states have internal predecessors, (152), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 17:31:24,201 INFO L276 IsEmpty]: Start isEmpty. Operand 293 states and 342 transitions. [2023-12-02 17:31:24,201 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 115 [2023-12-02 17:31:24,201 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 17:31:24,202 INFO L195 NwaCegarLoop]: trace histogram [92, 4, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 17:31:24,207 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e286c196-a85b-43b5-adb4-d9d14dae5c99/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Ended with exit code 0 [2023-12-02 17:31:24,402 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e286c196-a85b-43b5-adb4-d9d14dae5c99/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 17:31:24,402 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 17:31:24,402 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 17:31:24,403 INFO L85 PathProgramCache]: Analyzing trace with hash 774436953, now seen corresponding path program 5 times [2023-12-02 17:31:24,403 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 17:31:24,403 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [366236429] [2023-12-02 17:31:24,403 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 17:31:24,403 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 17:31:24,513 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 17:31:30,250 INFO L134 CoverageAnalysis]: Checked inductivity of 4301 backedges. 0 proven. 4278 refuted. 0 times theorem prover too weak. 23 trivial. 0 not checked. [2023-12-02 17:31:30,250 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 17:31:30,250 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [366236429] [2023-12-02 17:31:30,251 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [366236429] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 17:31:30,251 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [624198610] [2023-12-02 17:31:30,251 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-12-02 17:31:30,251 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 17:31:30,251 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e286c196-a85b-43b5-adb4-d9d14dae5c99/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 17:31:30,252 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e286c196-a85b-43b5-adb4-d9d14dae5c99/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 17:31:30,253 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e286c196-a85b-43b5-adb4-d9d14dae5c99/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2023-12-02 17:31:30,430 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2023-12-02 17:31:30,430 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 17:31:30,432 INFO L262 TraceCheckSpWp]: Trace formula consists of 163 conjuncts, 14 conjunts are in the unsatisfiable core [2023-12-02 17:31:30,437 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 17:31:30,632 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 38 treesize of output 22 [2023-12-02 17:31:30,755 INFO L134 CoverageAnalysis]: Checked inductivity of 4301 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 4285 trivial. 0 not checked. [2023-12-02 17:31:30,756 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 17:31:31,515 INFO L134 CoverageAnalysis]: Checked inductivity of 4301 backedges. 0 proven. 16 refuted. 0 times theorem prover too weak. 4285 trivial. 0 not checked. [2023-12-02 17:31:31,515 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [624198610] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 17:31:31,515 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2033732512] [2023-12-02 17:31:31,516 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2023-12-02 17:31:31,516 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 17:31:31,517 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 17:31:31,517 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 17:31:31,517 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 17:31:31,682 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 17:31:32,260 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '9402#(and (<= 0 |ULTIMATE.start_main_~x~0#1|) (<= 1 |ULTIMATE.start_main_~pos~0#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 1) (<= 0 |ULTIMATE.start___VERIFIER_assert_#in~cond#1|))' at error location [2023-12-02 17:31:32,261 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 17:31:32,261 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 17:31:32,261 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [94, 10, 10] total 112 [2023-12-02 17:31:32,261 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1988480968] [2023-12-02 17:31:32,261 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 17:31:32,262 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 113 states [2023-12-02 17:31:32,262 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 17:31:32,264 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 113 interpolants. [2023-12-02 17:31:32,265 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5924, Invalid=8596, Unknown=0, NotChecked=0, Total=14520 [2023-12-02 17:31:32,265 INFO L87 Difference]: Start difference. First operand 293 states and 342 transitions. Second operand has 113 states, 113 states have (on average 1.1592920353982301) internal successors, (131), 112 states have internal predecessors, (131), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 17:31:50,986 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 17:31:50,986 INFO L93 Difference]: Finished difference Result 884 states and 1250 transitions. [2023-12-02 17:31:50,987 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 202 states. [2023-12-02 17:31:50,987 INFO L78 Accepts]: Start accepts. Automaton has has 113 states, 113 states have (on average 1.1592920353982301) internal successors, (131), 112 states have internal predecessors, (131), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 114 [2023-12-02 17:31:50,987 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 17:31:50,991 INFO L225 Difference]: With dead ends: 884 [2023-12-02 17:31:50,991 INFO L226 Difference]: Without dead ends: 685 [2023-12-02 17:31:50,997 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 632 GetRequests, 315 SyntacticMatches, 0 SemanticMatches, 317 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24424 ImplicationChecksByTransitivity, 20.6s TimeCoverageRelationStatistics Valid=31709, Invalid=69733, Unknown=0, NotChecked=0, Total=101442 [2023-12-02 17:31:50,998 INFO L413 NwaCegarLoop]: 6 mSDtfsCounter, 993 mSDsluCounter, 30 mSDsCounter, 0 mSdLazyCounter, 499 mSolverCounterSat, 685 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 993 SdHoareTripleChecker+Valid, 36 SdHoareTripleChecker+Invalid, 1184 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 685 IncrementalHoareTripleChecker+Valid, 499 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2023-12-02 17:31:50,998 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [993 Valid, 36 Invalid, 1184 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [685 Valid, 499 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2023-12-02 17:31:50,999 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 685 states. [2023-12-02 17:31:51,298 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 685 to 513. [2023-12-02 17:31:51,299 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 513 states, 512 states have (on average 1.201171875) internal successors, (615), 512 states have internal predecessors, (615), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 17:31:51,301 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 513 states to 513 states and 615 transitions. [2023-12-02 17:31:51,301 INFO L78 Accepts]: Start accepts. Automaton has 513 states and 615 transitions. Word has length 114 [2023-12-02 17:31:51,301 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 17:31:51,301 INFO L495 AbstractCegarLoop]: Abstraction has 513 states and 615 transitions. [2023-12-02 17:31:51,301 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 113 states, 113 states have (on average 1.1592920353982301) internal successors, (131), 112 states have internal predecessors, (131), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 17:31:51,302 INFO L276 IsEmpty]: Start isEmpty. Operand 513 states and 615 transitions. [2023-12-02 17:31:51,302 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 125 [2023-12-02 17:31:51,303 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 17:31:51,303 INFO L195 NwaCegarLoop]: trace histogram [100, 5, 4, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 17:31:51,307 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e286c196-a85b-43b5-adb4-d9d14dae5c99/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Ended with exit code 0 [2023-12-02 17:31:51,503 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e286c196-a85b-43b5-adb4-d9d14dae5c99/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2023-12-02 17:31:51,503 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 17:31:51,504 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 17:31:51,504 INFO L85 PathProgramCache]: Analyzing trace with hash -1151790863, now seen corresponding path program 6 times [2023-12-02 17:31:51,504 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 17:31:51,504 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1328687653] [2023-12-02 17:31:51,504 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 17:31:51,504 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 17:31:51,599 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 17:31:57,588 INFO L134 CoverageAnalysis]: Checked inductivity of 5082 backedges. 0 proven. 5050 refuted. 0 times theorem prover too weak. 32 trivial. 0 not checked. [2023-12-02 17:31:57,588 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 17:31:57,588 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1328687653] [2023-12-02 17:31:57,588 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1328687653] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 17:31:57,588 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [513056659] [2023-12-02 17:31:57,588 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-12-02 17:31:57,588 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 17:31:57,589 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e286c196-a85b-43b5-adb4-d9d14dae5c99/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 17:31:57,589 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e286c196-a85b-43b5-adb4-d9d14dae5c99/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 17:31:57,590 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e286c196-a85b-43b5-adb4-d9d14dae5c99/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2023-12-02 17:31:57,774 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-12-02 17:31:57,774 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 17:31:57,775 INFO L262 TraceCheckSpWp]: Trace formula consists of 101 conjuncts, 46 conjunts are in the unsatisfiable core [2023-12-02 17:31:57,779 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 17:31:58,216 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-12-02 17:31:58,217 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 39 treesize of output 35 [2023-12-02 17:31:58,325 INFO L349 Elim1Store]: treesize reduction 74, result has 30.2 percent of original size [2023-12-02 17:31:58,325 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 9 case distinctions, treesize of input 50 treesize of output 62 [2023-12-02 17:31:58,603 INFO L349 Elim1Store]: treesize reduction 201, result has 30.9 percent of original size [2023-12-02 17:31:58,603 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 7 select indices, 7 select index equivalence classes, 0 disjoint index pairs (out of 21 index pairs), introduced 7 new quantified variables, introduced 27 case distinctions, treesize of input 99 treesize of output 140 [2023-12-02 17:32:00,591 INFO L349 Elim1Store]: treesize reduction 594, result has 43.8 percent of original size [2023-12-02 17:32:00,591 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 14 select indices, 14 select index equivalence classes, 0 disjoint index pairs (out of 91 index pairs), introduced 14 new quantified variables, introduced 104 case distinctions, treesize of input 199 treesize of output 549 [2023-12-02 17:42:25,997 WARN L293 SmtUtils]: Spent 33.59s on a formula simplification. DAG size of input: 7474 DAG size of output: 7585 (called from [L 731] de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher.simplify) [2023-12-02 17:43:05,212 WARN L293 SmtUtils]: Spent 27.85s on a formula simplification. DAG size of input: 7442 DAG size of output: 7211 (called from [L 731] de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher.simplify)