./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/array-examples/sorting_selectionsort_ground-1.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 0e0057cc Calling Ultimate with: /usr/lib/jvm/java-1.11.0-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c1c840c1-aa34-40fb-baa1-4d846780b8b7/bin/utaipan-verify-nQ1chXbOIh/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c1c840c1-aa34-40fb-baa1-4d846780b8b7/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_c1c840c1-aa34-40fb-baa1-4d846780b8b7/bin/utaipan-verify-nQ1chXbOIh/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c1c840c1-aa34-40fb-baa1-4d846780b8b7/bin/utaipan-verify-nQ1chXbOIh/config/TaipanReach.xml -i ../../sv-benchmarks/c/array-examples/sorting_selectionsort_ground-1.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c1c840c1-aa34-40fb-baa1-4d846780b8b7/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_c1c840c1-aa34-40fb-baa1-4d846780b8b7/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 5aa72773233f17156d62ec9c7729aefdd69e77cc68e9bdd6e006eaf36895d27a --- Real Ultimate output --- This is Ultimate 0.2.4-dev-0e0057c [2023-12-02 14:10:58,836 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-12-02 14:10:58,906 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c1c840c1-aa34-40fb-baa1-4d846780b8b7/bin/utaipan-verify-nQ1chXbOIh/config/svcomp-Reach-32bit-Taipan_Default.epf [2023-12-02 14:10:58,911 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-12-02 14:10:58,912 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-12-02 14:10:58,937 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-12-02 14:10:58,938 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-12-02 14:10:58,939 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-12-02 14:10:58,940 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-12-02 14:10:58,940 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-12-02 14:10:58,941 INFO L153 SettingsManager]: * User list type=DISABLED [2023-12-02 14:10:58,941 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-12-02 14:10:58,942 INFO L153 SettingsManager]: * Explicit value domain=true [2023-12-02 14:10:58,942 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-12-02 14:10:58,943 INFO L153 SettingsManager]: * Octagon Domain=false [2023-12-02 14:10:58,943 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-12-02 14:10:58,944 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-12-02 14:10:58,944 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-12-02 14:10:58,945 INFO L153 SettingsManager]: * Interval Domain=false [2023-12-02 14:10:58,946 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-12-02 14:10:58,946 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-12-02 14:10:58,949 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2023-12-02 14:10:58,950 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-12-02 14:10:58,950 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-12-02 14:10:58,950 INFO L153 SettingsManager]: * sizeof long=4 [2023-12-02 14:10:58,951 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-12-02 14:10:58,951 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-12-02 14:10:58,952 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-12-02 14:10:58,952 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-12-02 14:10:58,952 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-12-02 14:10:58,953 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-12-02 14:10:58,953 INFO L153 SettingsManager]: * sizeof long double=12 [2023-12-02 14:10:58,953 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2023-12-02 14:10:58,954 INFO L153 SettingsManager]: * Use constant arrays=true [2023-12-02 14:10:58,954 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-12-02 14:10:58,954 INFO L153 SettingsManager]: * Only consider context switches at boundaries of atomic blocks=true [2023-12-02 14:10:58,954 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-12-02 14:10:58,955 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-12-02 14:10:58,955 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-12-02 14:10:58,955 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-12-02 14:10:58,955 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2023-12-02 14:10:58,956 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-12-02 14:10:58,956 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-12-02 14:10:58,956 INFO L153 SettingsManager]: * Apply one-shot large block encoding in concurrent analysis=false [2023-12-02 14:10:58,956 INFO L153 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-12-02 14:10:58,957 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-12-02 14:10:58,957 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-12-02 14:10:58,957 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_c1c840c1-aa34-40fb-baa1-4d846780b8b7/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c1c840c1-aa34-40fb-baa1-4d846780b8b7/bin/utaipan-verify-nQ1chXbOIh Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 5aa72773233f17156d62ec9c7729aefdd69e77cc68e9bdd6e006eaf36895d27a [2023-12-02 14:10:59,182 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-12-02 14:10:59,203 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-12-02 14:10:59,206 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-12-02 14:10:59,207 INFO L270 PluginConnector]: Initializing CDTParser... [2023-12-02 14:10:59,208 INFO L274 PluginConnector]: CDTParser initialized [2023-12-02 14:10:59,209 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c1c840c1-aa34-40fb-baa1-4d846780b8b7/bin/utaipan-verify-nQ1chXbOIh/../../sv-benchmarks/c/array-examples/sorting_selectionsort_ground-1.i [2023-12-02 14:11:02,035 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-12-02 14:11:02,206 INFO L384 CDTParser]: Found 1 translation units. [2023-12-02 14:11:02,207 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c1c840c1-aa34-40fb-baa1-4d846780b8b7/sv-benchmarks/c/array-examples/sorting_selectionsort_ground-1.i [2023-12-02 14:11:02,214 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c1c840c1-aa34-40fb-baa1-4d846780b8b7/bin/utaipan-verify-nQ1chXbOIh/data/7efe8196e/fbfd0039a0654973b875c50b71ba9cdd/FLAGc7f1f629b [2023-12-02 14:11:02,226 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c1c840c1-aa34-40fb-baa1-4d846780b8b7/bin/utaipan-verify-nQ1chXbOIh/data/7efe8196e/fbfd0039a0654973b875c50b71ba9cdd [2023-12-02 14:11:02,229 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-12-02 14:11:02,231 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-12-02 14:11:02,232 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-12-02 14:11:02,232 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-12-02 14:11:02,238 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-12-02 14:11:02,238 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.12 02:11:02" (1/1) ... [2023-12-02 14:11:02,240 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@268bb425 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 02:11:02, skipping insertion in model container [2023-12-02 14:11:02,240 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.12 02:11:02" (1/1) ... [2023-12-02 14:11:02,262 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-12-02 14:11:02,415 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_c1c840c1-aa34-40fb-baa1-4d846780b8b7/sv-benchmarks/c/array-examples/sorting_selectionsort_ground-1.i[823,836] [2023-12-02 14:11:02,437 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-12-02 14:11:02,448 INFO L202 MainTranslator]: Completed pre-run [2023-12-02 14:11:02,461 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_c1c840c1-aa34-40fb-baa1-4d846780b8b7/sv-benchmarks/c/array-examples/sorting_selectionsort_ground-1.i[823,836] [2023-12-02 14:11:02,474 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-12-02 14:11:02,491 INFO L206 MainTranslator]: Completed translation [2023-12-02 14:11:02,492 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 02:11:02 WrapperNode [2023-12-02 14:11:02,492 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-12-02 14:11:02,494 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-12-02 14:11:02,494 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-12-02 14:11:02,495 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-12-02 14:11:02,503 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 02:11:02" (1/1) ... [2023-12-02 14:11:02,511 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 02:11:02" (1/1) ... [2023-12-02 14:11:02,535 INFO L138 Inliner]: procedures = 16, calls = 25, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 117 [2023-12-02 14:11:02,535 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-12-02 14:11:02,536 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-12-02 14:11:02,536 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-12-02 14:11:02,537 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-12-02 14:11:02,546 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 02:11:02" (1/1) ... [2023-12-02 14:11:02,546 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 02:11:02" (1/1) ... [2023-12-02 14:11:02,549 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 02:11:02" (1/1) ... [2023-12-02 14:11:02,549 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 02:11:02" (1/1) ... [2023-12-02 14:11:02,555 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 02:11:02" (1/1) ... [2023-12-02 14:11:02,560 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 02:11:02" (1/1) ... [2023-12-02 14:11:02,561 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 02:11:02" (1/1) ... [2023-12-02 14:11:02,563 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 02:11:02" (1/1) ... [2023-12-02 14:11:02,565 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-12-02 14:11:02,566 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-12-02 14:11:02,566 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-12-02 14:11:02,566 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-12-02 14:11:02,567 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 02:11:02" (1/1) ... [2023-12-02 14:11:02,573 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-12-02 14:11:02,584 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c1c840c1-aa34-40fb-baa1-4d846780b8b7/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 14:11:02,597 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c1c840c1-aa34-40fb-baa1-4d846780b8b7/bin/utaipan-verify-nQ1chXbOIh/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-12-02 14:11:02,604 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c1c840c1-aa34-40fb-baa1-4d846780b8b7/bin/utaipan-verify-nQ1chXbOIh/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-12-02 14:11:02,637 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-12-02 14:11:02,637 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-12-02 14:11:02,638 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2023-12-02 14:11:02,638 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-12-02 14:11:02,640 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-12-02 14:11:02,640 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-12-02 14:11:02,641 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-12-02 14:11:02,641 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2023-12-02 14:11:02,641 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2023-12-02 14:11:02,641 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-12-02 14:11:02,726 INFO L241 CfgBuilder]: Building ICFG [2023-12-02 14:11:02,728 INFO L267 CfgBuilder]: Building CFG for each procedure with an implementation [2023-12-02 14:11:02,892 INFO L282 CfgBuilder]: Performing block encoding [2023-12-02 14:11:02,966 INFO L304 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-12-02 14:11:02,966 INFO L309 CfgBuilder]: Removed 8 assume(true) statements. [2023-12-02 14:11:02,968 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.12 02:11:02 BoogieIcfgContainer [2023-12-02 14:11:02,968 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-12-02 14:11:02,971 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-12-02 14:11:02,971 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-12-02 14:11:02,974 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-12-02 14:11:02,974 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.12 02:11:02" (1/3) ... [2023-12-02 14:11:02,975 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@28ff2031 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.12 02:11:02, skipping insertion in model container [2023-12-02 14:11:02,975 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 02:11:02" (2/3) ... [2023-12-02 14:11:02,975 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@28ff2031 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.12 02:11:02, skipping insertion in model container [2023-12-02 14:11:02,976 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.12 02:11:02" (3/3) ... [2023-12-02 14:11:02,977 INFO L112 eAbstractionObserver]: Analyzing ICFG sorting_selectionsort_ground-1.i [2023-12-02 14:11:02,993 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-12-02 14:11:02,993 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-12-02 14:11:03,036 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-12-02 14:11:03,042 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;@d8d21f9, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-12-02 14:11:03,042 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-12-02 14:11:03,045 INFO L276 IsEmpty]: Start isEmpty. Operand has 22 states, 16 states have (on average 1.625) internal successors, (26), 17 states have internal predecessors, (26), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-12-02 14:11:03,051 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2023-12-02 14:11:03,051 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 14:11:03,052 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 14:11:03,052 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 14:11:03,072 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 14:11:03,073 INFO L85 PathProgramCache]: Analyzing trace with hash -295987307, now seen corresponding path program 1 times [2023-12-02 14:11:03,080 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 14:11:03,081 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [901497111] [2023-12-02 14:11:03,081 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:11:03,081 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 14:11:03,184 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:11:03,285 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 14:11:03,285 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 14:11:03,286 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [901497111] [2023-12-02 14:11:03,286 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [901497111] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 14:11:03,287 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 14:11:03,287 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-12-02 14:11:03,289 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2117070375] [2023-12-02 14:11:03,290 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 14:11:03,294 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 14:11:03,294 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 14:11:03,324 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 14:11:03,325 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-12-02 14:11:03,327 INFO L87 Difference]: Start difference. First operand has 22 states, 16 states have (on average 1.625) internal successors, (26), 17 states have internal predecessors, (26), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Second operand has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 2 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 14:11:03,393 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 14:11:03,393 INFO L93 Difference]: Finished difference Result 43 states and 66 transitions. [2023-12-02 14:11:03,394 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 14:11:03,396 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), 1 states have call successors, (1), 1 states have call predecessors, (1), 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 14:11:03,396 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 14:11:03,403 INFO L225 Difference]: With dead ends: 43 [2023-12-02 14:11:03,404 INFO L226 Difference]: Without dead ends: 22 [2023-12-02 14:11:03,407 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 14:11:03,411 INFO L413 NwaCegarLoop]: 17 mSDtfsCounter, 0 mSDsluCounter, 17 mSDsCounter, 0 mSdLazyCounter, 27 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 34 SdHoareTripleChecker+Invalid, 27 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 27 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-12-02 14:11:03,412 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 34 Invalid, 27 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 27 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-12-02 14:11:03,430 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2023-12-02 14:11:03,448 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2023-12-02 14:11:03,449 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22 states, 17 states have (on average 1.4705882352941178) internal successors, (25), 17 states have internal predecessors, (25), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-12-02 14:11:03,450 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 31 transitions. [2023-12-02 14:11:03,452 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 31 transitions. Word has length 9 [2023-12-02 14:11:03,452 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 14:11:03,452 INFO L495 AbstractCegarLoop]: Abstraction has 22 states and 31 transitions. [2023-12-02 14:11:03,453 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), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 14:11:03,453 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 31 transitions. [2023-12-02 14:11:03,454 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2023-12-02 14:11:03,454 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 14:11:03,454 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 14:11:03,454 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-12-02 14:11:03,455 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 14:11:03,456 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 14:11:03,456 INFO L85 PathProgramCache]: Analyzing trace with hash 1716688572, now seen corresponding path program 1 times [2023-12-02 14:11:03,456 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 14:11:03,457 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [372989869] [2023-12-02 14:11:03,457 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:11:03,457 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 14:11:03,476 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:11:03,546 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 14:11:03,547 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 14:11:03,547 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [372989869] [2023-12-02 14:11:03,547 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [372989869] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 14:11:03,547 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2027659605] [2023-12-02 14:11:03,548 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:11:03,548 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:11:03,548 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c1c840c1-aa34-40fb-baa1-4d846780b8b7/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 14:11:03,552 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c1c840c1-aa34-40fb-baa1-4d846780b8b7/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 14:11:03,561 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c1c840c1-aa34-40fb-baa1-4d846780b8b7/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-12-02 14:11:03,625 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:11:03,627 INFO L262 TraceCheckSpWp]: Trace formula consists of 65 conjuncts, 2 conjunts are in the unsatisfiable core [2023-12-02 14:11:03,632 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 14:11:03,652 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 14:11:03,652 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 14:11:03,653 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2027659605] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 14:11:03,653 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 14:11:03,653 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [3] total 5 [2023-12-02 14:11:03,654 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2083217901] [2023-12-02 14:11:03,654 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 14:11:03,655 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 14:11:03,656 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 14:11:03,656 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 14:11:03,657 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2023-12-02 14:11:03,657 INFO L87 Difference]: Start difference. First operand 22 states and 31 transitions. Second operand has 3 states, 3 states have (on average 3.0) internal successors, (9), 3 states have internal predecessors, (9), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 14:11:03,717 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 14:11:03,717 INFO L93 Difference]: Finished difference Result 41 states and 58 transitions. [2023-12-02 14:11:03,718 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 14:11:03,718 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 3.0) internal successors, (9), 3 states have internal predecessors, (9), 1 states have call successors, (1), 1 states have call predecessors, (1), 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 14:11:03,718 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 14:11:03,719 INFO L225 Difference]: With dead ends: 41 [2023-12-02 14:11:03,720 INFO L226 Difference]: Without dead ends: 31 [2023-12-02 14:11:03,720 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2023-12-02 14:11:03,722 INFO L413 NwaCegarLoop]: 13 mSDtfsCounter, 11 mSDsluCounter, 13 mSDsCounter, 0 mSdLazyCounter, 31 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 13 SdHoareTripleChecker+Valid, 26 SdHoareTripleChecker+Invalid, 32 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 31 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-12-02 14:11:03,723 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [13 Valid, 26 Invalid, 32 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 31 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-12-02 14:11:03,724 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2023-12-02 14:11:03,730 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 23. [2023-12-02 14:11:03,731 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23 states, 18 states have (on average 1.4444444444444444) internal successors, (26), 18 states have internal predecessors, (26), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-12-02 14:11:03,732 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 32 transitions. [2023-12-02 14:11:03,732 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 32 transitions. Word has length 10 [2023-12-02 14:11:03,733 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 14:11:03,733 INFO L495 AbstractCegarLoop]: Abstraction has 23 states and 32 transitions. [2023-12-02 14:11:03,733 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 3.0) internal successors, (9), 3 states have internal predecessors, (9), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 14:11:03,733 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 32 transitions. [2023-12-02 14:11:03,734 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2023-12-02 14:11:03,734 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 14:11:03,734 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 14:11:03,742 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c1c840c1-aa34-40fb-baa1-4d846780b8b7/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-12-02 14:11:03,940 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c1c840c1-aa34-40fb-baa1-4d846780b8b7/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1 [2023-12-02 14:11:03,940 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 14:11:03,941 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 14:11:03,941 INFO L85 PathProgramCache]: Analyzing trace with hash 1686478395, now seen corresponding path program 1 times [2023-12-02 14:11:03,941 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 14:11:03,941 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2003842837] [2023-12-02 14:11:03,941 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:11:03,942 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 14:11:03,957 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:11:04,019 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 14:11:04,020 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 14:11:04,020 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2003842837] [2023-12-02 14:11:04,021 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2003842837] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 14:11:04,022 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1927741052] [2023-12-02 14:11:04,025 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:11:04,026 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:11:04,026 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c1c840c1-aa34-40fb-baa1-4d846780b8b7/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 14:11:04,028 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c1c840c1-aa34-40fb-baa1-4d846780b8b7/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 14:11:04,035 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c1c840c1-aa34-40fb-baa1-4d846780b8b7/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-12-02 14:11:04,098 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:11:04,100 INFO L262 TraceCheckSpWp]: Trace formula consists of 76 conjuncts, 3 conjunts are in the unsatisfiable core [2023-12-02 14:11:04,101 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 14:11:04,134 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 14:11:04,134 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 14:11:04,154 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 14:11:04,155 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1927741052] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 14:11:04,155 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [835235463] [2023-12-02 14:11:04,177 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2023-12-02 14:11:04,177 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 14:11:04,181 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 14:11:04,187 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 14:11:04,187 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 14:11:04,520 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 14:11:04,583 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSifa [835235463] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 14:11:04,583 INFO L185 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2023-12-02 14:11:04,584 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [3, 3, 3] total 9 [2023-12-02 14:11:04,584 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [260460183] [2023-12-02 14:11:04,584 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 14:11:04,585 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-12-02 14:11:04,585 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 14:11:04,586 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-12-02 14:11:04,586 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=61, Unknown=0, NotChecked=0, Total=90 [2023-12-02 14:11:04,586 INFO L87 Difference]: Start difference. First operand 23 states and 32 transitions. Second operand has 5 states, 5 states have (on average 2.0) internal successors, (10), 4 states have internal predecessors, (10), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 14:11:04,668 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 14:11:04,668 INFO L93 Difference]: Finished difference Result 51 states and 75 transitions. [2023-12-02 14:11:04,668 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-12-02 14:11:04,668 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.0) internal successors, (10), 4 states have internal predecessors, (10), 1 states have call successors, (1), 1 states have call predecessors, (1), 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 14:11:04,669 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 14:11:04,669 INFO L225 Difference]: With dead ends: 51 [2023-12-02 14:11:04,669 INFO L226 Difference]: Without dead ends: 32 [2023-12-02 14:11:04,670 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 26 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=29, Invalid=61, Unknown=0, NotChecked=0, Total=90 [2023-12-02 14:11:04,671 INFO L413 NwaCegarLoop]: 13 mSDtfsCounter, 10 mSDsluCounter, 10 mSDsCounter, 0 mSdLazyCounter, 61 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 23 SdHoareTripleChecker+Invalid, 61 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 61 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 14:11:04,672 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [12 Valid, 23 Invalid, 61 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 61 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 14:11:04,673 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2023-12-02 14:11:04,678 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 24. [2023-12-02 14:11:04,678 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 19 states have (on average 1.4210526315789473) internal successors, (27), 19 states have internal predecessors, (27), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-12-02 14:11:04,679 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 33 transitions. [2023-12-02 14:11:04,679 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 33 transitions. Word has length 11 [2023-12-02 14:11:04,679 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 14:11:04,679 INFO L495 AbstractCegarLoop]: Abstraction has 24 states and 33 transitions. [2023-12-02 14:11:04,679 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 2.0) internal successors, (10), 4 states have internal predecessors, (10), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 14:11:04,680 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 33 transitions. [2023-12-02 14:11:04,680 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2023-12-02 14:11:04,680 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 14:11:04,680 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 14:11:04,686 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c1c840c1-aa34-40fb-baa1-4d846780b8b7/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Ended with exit code 0 [2023-12-02 14:11:04,884 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c1c840c1-aa34-40fb-baa1-4d846780b8b7/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:11:04,885 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 14:11:04,885 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 14:11:04,885 INFO L85 PathProgramCache]: Analyzing trace with hash -402000641, now seen corresponding path program 1 times [2023-12-02 14:11:04,886 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 14:11:04,886 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1990982087] [2023-12-02 14:11:04,886 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:11:04,886 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 14:11:04,897 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:11:04,944 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 14:11:04,944 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 14:11:04,944 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1990982087] [2023-12-02 14:11:04,944 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1990982087] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 14:11:04,945 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [704451834] [2023-12-02 14:11:04,945 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:11:04,945 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:11:04,945 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c1c840c1-aa34-40fb-baa1-4d846780b8b7/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 14:11:04,946 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c1c840c1-aa34-40fb-baa1-4d846780b8b7/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 14:11:04,953 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c1c840c1-aa34-40fb-baa1-4d846780b8b7/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-12-02 14:11:05,007 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:11:05,008 INFO L262 TraceCheckSpWp]: Trace formula consists of 80 conjuncts, 3 conjunts are in the unsatisfiable core [2023-12-02 14:11:05,009 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 14:11:05,022 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 14:11:05,022 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 14:11:05,037 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 14:11:05,037 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [704451834] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 14:11:05,037 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2138875623] [2023-12-02 14:11:05,040 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2023-12-02 14:11:05,040 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 14:11:05,040 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 14:11:05,040 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 14:11:05,040 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 14:11:05,245 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 38 for LOIs [2023-12-02 14:11:05,263 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 14:11:05,530 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '529#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (exists ((|v_ULTIMATE.start_main_~i~0#1_BEFORE_CALL_1| Int) (|v_ULTIMATE.start_main_~#a~0#1.offset_BEFORE_CALL_1| Int) (|v_ULTIMATE.start_main_~s~0#1_BEFORE_CALL_1| Int) (|v_ULTIMATE.start_main_~#a~0#1.base_BEFORE_CALL_1| Int)) (and (<= (+ (select (select |#memory_int| |v_ULTIMATE.start_main_~#a~0#1.base_BEFORE_CALL_1|) |v_ULTIMATE.start_main_~#a~0#1.offset_BEFORE_CALL_1|) 1) (select (select |#memory_int| |v_ULTIMATE.start_main_~#a~0#1.base_BEFORE_CALL_1|) (+ |v_ULTIMATE.start_main_~#a~0#1.offset_BEFORE_CALL_1| (* |v_ULTIMATE.start_main_~i~0#1_BEFORE_CALL_1| 4)))) (<= |v_ULTIMATE.start_main_~i~0#1_BEFORE_CALL_1| 0) (or (= |v_ULTIMATE.start_main_~i~0#1_BEFORE_CALL_1| |v_ULTIMATE.start_main_~s~0#1_BEFORE_CALL_1|) (exists ((|v_#memory_int_40| (Array Int (Array Int Int)))) (= |#memory_int| (store |v_#memory_int_40| |v_ULTIMATE.start_main_~#a~0#1.base_BEFORE_CALL_1| (store (store (select |v_#memory_int_40| |v_ULTIMATE.start_main_~#a~0#1.base_BEFORE_CALL_1|) (+ |v_ULTIMATE.start_main_~#a~0#1.offset_BEFORE_CALL_1| (* |v_ULTIMATE.start_main_~s~0#1_BEFORE_CALL_1| 4)) (select (select |v_#memory_int_40| |v_ULTIMATE.start_main_~#a~0#1.base_BEFORE_CALL_1|) (+ |v_ULTIMATE.start_main_~#a~0#1.offset_BEFORE_CALL_1| (* |v_ULTIMATE.start_main_~i~0#1_BEFORE_CALL_1| 4)))) (+ |v_ULTIMATE.start_main_~#a~0#1.offset_BEFORE_CALL_1| (* |v_ULTIMATE.start_main_~i~0#1_BEFORE_CALL_1| 4)) (select (select |v_#memory_int_40| |v_ULTIMATE.start_main_~#a~0#1.base_BEFORE_CALL_1|) (+ |v_ULTIMATE.start_main_~#a~0#1.offset_BEFORE_CALL_1| (* |v_ULTIMATE.start_main_~s~0#1_BEFORE_CALL_1| 4)))))))))))' at error location [2023-12-02 14:11:05,531 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 14:11:05,531 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 14:11:05,531 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3, 3] total 6 [2023-12-02 14:11:05,531 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1932673748] [2023-12-02 14:11:05,531 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 14:11:05,532 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-12-02 14:11:05,532 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 14:11:05,532 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-12-02 14:11:05,533 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=166, Unknown=0, NotChecked=0, Total=210 [2023-12-02 14:11:05,533 INFO L87 Difference]: Start difference. First operand 24 states and 33 transitions. Second operand has 7 states, 7 states have (on average 2.2857142857142856) internal successors, (16), 6 states have internal predecessors, (16), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 14:11:05,589 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 14:11:05,589 INFO L93 Difference]: Finished difference Result 48 states and 68 transitions. [2023-12-02 14:11:05,590 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-12-02 14:11:05,590 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 2.2857142857142856) internal successors, (16), 6 states have internal predecessors, (16), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 12 [2023-12-02 14:11:05,590 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 14:11:05,591 INFO L225 Difference]: With dead ends: 48 [2023-12-02 14:11:05,591 INFO L226 Difference]: Without dead ends: 27 [2023-12-02 14:11:05,591 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 61 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=44, Invalid=166, Unknown=0, NotChecked=0, Total=210 [2023-12-02 14:11:05,592 INFO L413 NwaCegarLoop]: 17 mSDtfsCounter, 0 mSDsluCounter, 68 mSDsCounter, 0 mSdLazyCounter, 62 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 85 SdHoareTripleChecker+Invalid, 63 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 62 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-12-02 14:11:05,593 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 85 Invalid, 63 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 62 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-12-02 14:11:05,593 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2023-12-02 14:11:05,598 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2023-12-02 14:11:05,598 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 22 states have (on average 1.3636363636363635) internal successors, (30), 22 states have internal predecessors, (30), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-12-02 14:11:05,599 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 36 transitions. [2023-12-02 14:11:05,599 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 36 transitions. Word has length 12 [2023-12-02 14:11:05,599 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 14:11:05,600 INFO L495 AbstractCegarLoop]: Abstraction has 27 states and 36 transitions. [2023-12-02 14:11:05,600 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 2.2857142857142856) internal successors, (16), 6 states have internal predecessors, (16), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 14:11:05,600 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 36 transitions. [2023-12-02 14:11:05,601 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2023-12-02 14:11:05,601 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 14:11:05,601 INFO L195 NwaCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 14:11:05,605 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c1c840c1-aa34-40fb-baa1-4d846780b8b7/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Ended with exit code 0 [2023-12-02 14:11:05,804 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c1c840c1-aa34-40fb-baa1-4d846780b8b7/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:11:05,805 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 14:11:05,805 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 14:11:05,805 INFO L85 PathProgramCache]: Analyzing trace with hash 1760740696, now seen corresponding path program 2 times [2023-12-02 14:11:05,805 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 14:11:05,806 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1373324679] [2023-12-02 14:11:05,806 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:11:05,806 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 14:11:05,830 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:11:05,918 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 14:11:05,918 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 14:11:05,919 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1373324679] [2023-12-02 14:11:05,919 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1373324679] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 14:11:05,919 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [36078896] [2023-12-02 14:11:05,919 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-12-02 14:11:05,919 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:11:05,919 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c1c840c1-aa34-40fb-baa1-4d846780b8b7/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 14:11:05,921 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c1c840c1-aa34-40fb-baa1-4d846780b8b7/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 14:11:05,924 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c1c840c1-aa34-40fb-baa1-4d846780b8b7/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-12-02 14:11:05,983 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 1 check-sat command(s) [2023-12-02 14:11:05,983 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 14:11:05,984 INFO L262 TraceCheckSpWp]: Trace formula consists of 67 conjuncts, 14 conjunts are in the unsatisfiable core [2023-12-02 14:11:05,986 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 14:11:06,058 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 15 treesize of output 7 [2023-12-02 14:11:06,091 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2023-12-02 14:11:06,091 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 14:11:06,091 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [36078896] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 14:11:06,092 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 14:11:06,092 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [6] total 12 [2023-12-02 14:11:06,092 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1953730647] [2023-12-02 14:11:06,092 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 14:11:06,092 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2023-12-02 14:11:06,092 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 14:11:06,093 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2023-12-02 14:11:06,093 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=120, Unknown=0, NotChecked=0, Total=156 [2023-12-02 14:11:06,093 INFO L87 Difference]: Start difference. First operand 27 states and 36 transitions. Second operand has 8 states, 7 states have (on average 1.5714285714285714) internal successors, (11), 6 states have internal predecessors, (11), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 14:11:06,231 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 14:11:06,231 INFO L93 Difference]: Finished difference Result 58 states and 81 transitions. [2023-12-02 14:11:06,231 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2023-12-02 14:11:06,231 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 7 states have (on average 1.5714285714285714) internal successors, (11), 6 states have internal predecessors, (11), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 15 [2023-12-02 14:11:06,232 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 14:11:06,232 INFO L225 Difference]: With dead ends: 58 [2023-12-02 14:11:06,232 INFO L226 Difference]: Without dead ends: 39 [2023-12-02 14:11:06,233 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 33 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=46, Invalid=164, Unknown=0, NotChecked=0, Total=210 [2023-12-02 14:11:06,234 INFO L413 NwaCegarLoop]: 10 mSDtfsCounter, 28 mSDsluCounter, 41 mSDsCounter, 0 mSdLazyCounter, 112 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 32 SdHoareTripleChecker+Valid, 51 SdHoareTripleChecker+Invalid, 119 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 112 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 14:11:06,234 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [32 Valid, 51 Invalid, 119 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 112 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 14:11:06,235 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 39 states. [2023-12-02 14:11:06,240 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 39 to 35. [2023-12-02 14:11:06,241 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 35 states, 28 states have (on average 1.3214285714285714) internal successors, (37), 29 states have internal predecessors, (37), 4 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (4), 3 states have call predecessors, (4), 4 states have call successors, (4) [2023-12-02 14:11:06,242 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 45 transitions. [2023-12-02 14:11:06,242 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 45 transitions. Word has length 15 [2023-12-02 14:11:06,242 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 14:11:06,242 INFO L495 AbstractCegarLoop]: Abstraction has 35 states and 45 transitions. [2023-12-02 14:11:06,242 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 7 states have (on average 1.5714285714285714) internal successors, (11), 6 states have internal predecessors, (11), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 14:11:06,242 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 45 transitions. [2023-12-02 14:11:06,243 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2023-12-02 14:11:06,243 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 14:11:06,243 INFO L195 NwaCegarLoop]: trace histogram [4, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 14:11:06,248 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c1c840c1-aa34-40fb-baa1-4d846780b8b7/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Ended with exit code 0 [2023-12-02 14:11:06,444 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c1c840c1-aa34-40fb-baa1-4d846780b8b7/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:11:06,445 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 14:11:06,445 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 14:11:06,445 INFO L85 PathProgramCache]: Analyzing trace with hash -347164659, now seen corresponding path program 1 times [2023-12-02 14:11:06,445 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 14:11:06,445 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [633864052] [2023-12-02 14:11:06,446 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:11:06,446 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 14:11:06,463 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:11:06,548 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 2 proven. 10 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-12-02 14:11:06,548 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 14:11:06,548 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [633864052] [2023-12-02 14:11:06,548 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [633864052] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 14:11:06,549 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2021043145] [2023-12-02 14:11:06,549 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:11:06,549 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:11:06,549 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c1c840c1-aa34-40fb-baa1-4d846780b8b7/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 14:11:06,551 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c1c840c1-aa34-40fb-baa1-4d846780b8b7/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 14:11:06,557 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c1c840c1-aa34-40fb-baa1-4d846780b8b7/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-12-02 14:11:06,628 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:11:06,629 INFO L262 TraceCheckSpWp]: Trace formula consists of 123 conjuncts, 6 conjunts are in the unsatisfiable core [2023-12-02 14:11:06,631 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 14:11:06,648 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2023-12-02 14:11:06,648 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 14:11:06,714 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 2 proven. 10 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-12-02 14:11:06,714 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2021043145] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 14:11:06,714 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [418556663] [2023-12-02 14:11:06,717 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-12-02 14:11:06,717 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 14:11:06,718 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 14:11:06,718 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 14:11:06,718 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 14:11:06,979 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 6 for LOIs [2023-12-02 14:11:06,986 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 14:11:07,143 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1011#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0))' at error location [2023-12-02 14:11:07,148 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 14:11:07,149 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 14:11:07,149 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 6, 7] total 13 [2023-12-02 14:11:07,149 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [119370024] [2023-12-02 14:11:07,149 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 14:11:07,150 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2023-12-02 14:11:07,150 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 14:11:07,151 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2023-12-02 14:11:07,151 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=103, Invalid=355, Unknown=4, NotChecked=0, Total=462 [2023-12-02 14:11:07,152 INFO L87 Difference]: Start difference. First operand 35 states and 45 transitions. Second operand has 13 states, 13 states have (on average 2.1538461538461537) internal successors, (28), 13 states have internal predecessors, (28), 1 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2023-12-02 14:11:07,208 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 14:11:07,208 INFO L93 Difference]: Finished difference Result 70 states and 95 transitions. [2023-12-02 14:11:07,209 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2023-12-02 14:11:07,209 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 2.1538461538461537) internal successors, (28), 13 states have internal predecessors, (28), 1 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 22 [2023-12-02 14:11:07,209 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 14:11:07,211 INFO L225 Difference]: With dead ends: 70 [2023-12-02 14:11:07,211 INFO L226 Difference]: Without dead ends: 41 [2023-12-02 14:11:07,212 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 71 GetRequests, 51 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 162 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=103, Invalid=355, Unknown=4, NotChecked=0, Total=462 [2023-12-02 14:11:07,213 INFO L413 NwaCegarLoop]: 17 mSDtfsCounter, 0 mSDsluCounter, 51 mSDsCounter, 0 mSdLazyCounter, 57 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 68 SdHoareTripleChecker+Invalid, 58 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 57 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-12-02 14:11:07,213 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 68 Invalid, 58 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 57 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-12-02 14:11:07,214 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 41 states. [2023-12-02 14:11:07,221 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 41 to 41. [2023-12-02 14:11:07,221 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 41 states, 34 states have (on average 1.2647058823529411) internal successors, (43), 35 states have internal predecessors, (43), 4 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (4), 3 states have call predecessors, (4), 4 states have call successors, (4) [2023-12-02 14:11:07,222 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 41 states to 41 states and 51 transitions. [2023-12-02 14:11:07,222 INFO L78 Accepts]: Start accepts. Automaton has 41 states and 51 transitions. Word has length 22 [2023-12-02 14:11:07,222 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 14:11:07,222 INFO L495 AbstractCegarLoop]: Abstraction has 41 states and 51 transitions. [2023-12-02 14:11:07,223 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 2.1538461538461537) internal successors, (28), 13 states have internal predecessors, (28), 1 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2023-12-02 14:11:07,223 INFO L276 IsEmpty]: Start isEmpty. Operand 41 states and 51 transitions. [2023-12-02 14:11:07,224 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2023-12-02 14:11:07,224 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 14:11:07,224 INFO L195 NwaCegarLoop]: trace histogram [10, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 14:11:07,228 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c1c840c1-aa34-40fb-baa1-4d846780b8b7/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Ended with exit code 0 [2023-12-02 14:11:07,424 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c1c840c1-aa34-40fb-baa1-4d846780b8b7/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2023-12-02 14:11:07,424 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 14:11:07,425 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 14:11:07,425 INFO L85 PathProgramCache]: Analyzing trace with hash -252056211, now seen corresponding path program 2 times [2023-12-02 14:11:07,425 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 14:11:07,425 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1241368430] [2023-12-02 14:11:07,425 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:11:07,426 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 14:11:07,451 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:11:07,630 INFO L134 CoverageAnalysis]: Checked inductivity of 60 backedges. 2 proven. 55 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-12-02 14:11:07,630 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 14:11:07,630 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1241368430] [2023-12-02 14:11:07,630 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1241368430] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 14:11:07,630 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1353681035] [2023-12-02 14:11:07,631 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-12-02 14:11:07,631 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:11:07,631 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c1c840c1-aa34-40fb-baa1-4d846780b8b7/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 14:11:07,632 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c1c840c1-aa34-40fb-baa1-4d846780b8b7/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 14:11:07,636 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c1c840c1-aa34-40fb-baa1-4d846780b8b7/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2023-12-02 14:11:07,707 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2023-12-02 14:11:07,707 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 14:11:07,708 INFO L262 TraceCheckSpWp]: Trace formula consists of 105 conjuncts, 4 conjunts are in the unsatisfiable core [2023-12-02 14:11:07,710 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 14:11:07,740 INFO L134 CoverageAnalysis]: Checked inductivity of 60 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 59 trivial. 0 not checked. [2023-12-02 14:11:07,741 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 14:11:07,780 INFO L134 CoverageAnalysis]: Checked inductivity of 60 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2023-12-02 14:11:07,781 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1353681035] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 14:11:07,781 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [357928648] [2023-12-02 14:11:07,783 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-12-02 14:11:07,783 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 14:11:07,784 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 14:11:07,784 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 14:11:07,784 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 14:11:07,982 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 6 for LOIs [2023-12-02 14:11:07,988 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 14:11:08,202 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1388#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0))' at error location [2023-12-02 14:11:08,203 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 14:11:08,203 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 14:11:08,203 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 5, 5] total 19 [2023-12-02 14:11:08,203 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [35069099] [2023-12-02 14:11:08,203 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 14:11:08,204 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 19 states [2023-12-02 14:11:08,204 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 14:11:08,205 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 19 interpolants. [2023-12-02 14:11:08,205 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=130, Invalid=624, Unknown=2, NotChecked=0, Total=756 [2023-12-02 14:11:08,206 INFO L87 Difference]: Start difference. First operand 41 states and 51 transitions. Second operand has 19 states, 19 states have (on average 1.894736842105263) internal successors, (36), 19 states have internal predecessors, (36), 1 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2023-12-02 14:11:08,591 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 14:11:08,592 INFO L93 Difference]: Finished difference Result 88 states and 122 transitions. [2023-12-02 14:11:08,592 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2023-12-02 14:11:08,592 INFO L78 Accepts]: Start accepts. Automaton has has 19 states, 19 states have (on average 1.894736842105263) internal successors, (36), 19 states have internal predecessors, (36), 1 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 28 [2023-12-02 14:11:08,592 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 14:11:08,593 INFO L225 Difference]: With dead ends: 88 [2023-12-02 14:11:08,593 INFO L226 Difference]: Without dead ends: 59 [2023-12-02 14:11:08,595 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 112 GetRequests, 69 SyntacticMatches, 0 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 431 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=344, Invalid=1628, Unknown=8, NotChecked=0, Total=1980 [2023-12-02 14:11:08,596 INFO L413 NwaCegarLoop]: 14 mSDtfsCounter, 56 mSDsluCounter, 83 mSDsCounter, 0 mSdLazyCounter, 142 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 59 SdHoareTripleChecker+Valid, 97 SdHoareTripleChecker+Invalid, 148 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 142 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 14:11:08,596 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [59 Valid, 97 Invalid, 148 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 142 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 14:11:08,597 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2023-12-02 14:11:08,605 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 51. [2023-12-02 14:11:08,606 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 51 states, 43 states have (on average 1.2325581395348837) internal successors, (53), 44 states have internal predecessors, (53), 5 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (5), 4 states have call predecessors, (5), 5 states have call successors, (5) [2023-12-02 14:11:08,607 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 63 transitions. [2023-12-02 14:11:08,607 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 63 transitions. Word has length 28 [2023-12-02 14:11:08,607 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 14:11:08,607 INFO L495 AbstractCegarLoop]: Abstraction has 51 states and 63 transitions. [2023-12-02 14:11:08,608 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 19 states, 19 states have (on average 1.894736842105263) internal successors, (36), 19 states have internal predecessors, (36), 1 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2023-12-02 14:11:08,608 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 63 transitions. [2023-12-02 14:11:08,609 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2023-12-02 14:11:08,609 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 14:11:08,609 INFO L195 NwaCegarLoop]: trace histogram [11, 4, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 14:11:08,614 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c1c840c1-aa34-40fb-baa1-4d846780b8b7/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Ended with exit code 0 [2023-12-02 14:11:08,812 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c1c840c1-aa34-40fb-baa1-4d846780b8b7/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2023-12-02 14:11:08,813 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 14:11:08,813 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 14:11:08,813 INFO L85 PathProgramCache]: Analyzing trace with hash -1908718486, now seen corresponding path program 3 times [2023-12-02 14:11:08,813 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 14:11:08,814 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1302401822] [2023-12-02 14:11:08,814 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:11:08,814 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 14:11:08,841 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:11:09,067 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 2 proven. 66 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2023-12-02 14:11:09,068 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 14:11:09,068 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1302401822] [2023-12-02 14:11:09,068 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1302401822] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 14:11:09,068 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [507194000] [2023-12-02 14:11:09,068 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-12-02 14:11:09,069 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:11:09,069 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c1c840c1-aa34-40fb-baa1-4d846780b8b7/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 14:11:09,070 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c1c840c1-aa34-40fb-baa1-4d846780b8b7/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 14:11:09,072 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c1c840c1-aa34-40fb-baa1-4d846780b8b7/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2023-12-02 14:11:09,172 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-12-02 14:11:09,172 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 14:11:09,174 INFO L262 TraceCheckSpWp]: Trace formula consists of 198 conjuncts, 13 conjunts are in the unsatisfiable core [2023-12-02 14:11:09,176 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 14:11:09,204 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2023-12-02 14:11:09,204 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 14:11:09,437 INFO L134 CoverageAnalysis]: Checked inductivity of 80 backedges. 2 proven. 66 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2023-12-02 14:11:09,437 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [507194000] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 14:11:09,437 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [850069574] [2023-12-02 14:11:09,440 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-12-02 14:11:09,440 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 14:11:09,440 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 14:11:09,440 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 14:11:09,441 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 14:11:09,625 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 6 for LOIs [2023-12-02 14:11:09,629 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 14:11:09,815 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1883#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0))' at error location [2023-12-02 14:11:09,815 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 14:11:09,815 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 14:11:09,816 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 13, 14] total 27 [2023-12-02 14:11:09,816 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1725370065] [2023-12-02 14:11:09,816 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 14:11:09,816 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2023-12-02 14:11:09,817 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 14:11:09,818 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2023-12-02 14:11:09,818 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=376, Invalid=881, Unknown=3, NotChecked=0, Total=1260 [2023-12-02 14:11:09,819 INFO L87 Difference]: Start difference. First operand 51 states and 63 transitions. Second operand has 27 states, 27 states have (on average 1.5555555555555556) internal successors, (42), 27 states have internal predecessors, (42), 1 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2023-12-02 14:11:09,897 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 14:11:09,897 INFO L93 Difference]: Finished difference Result 102 states and 138 transitions. [2023-12-02 14:11:09,898 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2023-12-02 14:11:09,898 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 27 states have (on average 1.5555555555555556) internal successors, (42), 27 states have internal predecessors, (42), 1 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 32 [2023-12-02 14:11:09,898 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 14:11:09,899 INFO L225 Difference]: With dead ends: 102 [2023-12-02 14:11:09,899 INFO L226 Difference]: Without dead ends: 64 [2023-12-02 14:11:09,900 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 108 GetRequests, 74 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 378 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=376, Invalid=881, Unknown=3, NotChecked=0, Total=1260 [2023-12-02 14:11:09,901 INFO L413 NwaCegarLoop]: 17 mSDtfsCounter, 0 mSDsluCounter, 85 mSDsCounter, 0 mSdLazyCounter, 92 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 102 SdHoareTripleChecker+Invalid, 93 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 92 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 14:11:09,902 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 102 Invalid, 93 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 92 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 14:11:09,902 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 64 states. [2023-12-02 14:11:09,912 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 64 to 64. [2023-12-02 14:11:09,913 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 64 states, 56 states have (on average 1.1785714285714286) internal successors, (66), 57 states have internal predecessors, (66), 5 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (5), 4 states have call predecessors, (5), 5 states have call successors, (5) [2023-12-02 14:11:09,913 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 64 states to 64 states and 76 transitions. [2023-12-02 14:11:09,914 INFO L78 Accepts]: Start accepts. Automaton has 64 states and 76 transitions. Word has length 32 [2023-12-02 14:11:09,914 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 14:11:09,914 INFO L495 AbstractCegarLoop]: Abstraction has 64 states and 76 transitions. [2023-12-02 14:11:09,914 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 27 states have (on average 1.5555555555555556) internal successors, (42), 27 states have internal predecessors, (42), 1 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2023-12-02 14:11:09,914 INFO L276 IsEmpty]: Start isEmpty. Operand 64 states and 76 transitions. [2023-12-02 14:11:09,916 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 46 [2023-12-02 14:11:09,916 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 14:11:09,916 INFO L195 NwaCegarLoop]: trace histogram [24, 4, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 14:11:09,921 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c1c840c1-aa34-40fb-baa1-4d846780b8b7/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Ended with exit code 0 [2023-12-02 14:11:10,120 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c1c840c1-aa34-40fb-baa1-4d846780b8b7/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:11:10,121 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 14:11:10,121 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 14:11:10,121 INFO L85 PathProgramCache]: Analyzing trace with hash 450363043, now seen corresponding path program 4 times [2023-12-02 14:11:10,121 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 14:11:10,121 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2138811582] [2023-12-02 14:11:10,122 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:11:10,122 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 14:11:10,159 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:11:10,767 INFO L134 CoverageAnalysis]: Checked inductivity of 314 backedges. 2 proven. 300 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2023-12-02 14:11:10,767 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 14:11:10,768 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2138811582] [2023-12-02 14:11:10,768 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2138811582] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 14:11:10,768 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1491894633] [2023-12-02 14:11:10,768 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-12-02 14:11:10,768 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:11:10,768 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c1c840c1-aa34-40fb-baa1-4d846780b8b7/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 14:11:10,769 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c1c840c1-aa34-40fb-baa1-4d846780b8b7/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 14:11:10,771 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c1c840c1-aa34-40fb-baa1-4d846780b8b7/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2023-12-02 14:11:10,904 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:11:10,906 INFO L262 TraceCheckSpWp]: Trace formula consists of 315 conjuncts, 26 conjunts are in the unsatisfiable core [2023-12-02 14:11:10,909 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 14:11:10,957 INFO L134 CoverageAnalysis]: Checked inductivity of 314 backedges. 0 proven. 300 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2023-12-02 14:11:10,958 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 14:11:11,648 INFO L134 CoverageAnalysis]: Checked inductivity of 314 backedges. 2 proven. 300 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2023-12-02 14:11:11,648 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1491894633] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 14:11:11,649 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1847074478] [2023-12-02 14:11:11,651 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-12-02 14:11:11,651 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 14:11:11,652 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 14:11:11,652 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 14:11:11,652 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 14:11:11,857 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 6 for LOIs [2023-12-02 14:11:11,862 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 14:11:12,119 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2503#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0))' at error location [2023-12-02 14:11:12,119 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 14:11:12,119 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 14:11:12,119 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 26, 27] total 53 [2023-12-02 14:11:12,119 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1667253799] [2023-12-02 14:11:12,120 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 14:11:12,120 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 53 states [2023-12-02 14:11:12,121 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 14:11:12,122 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 53 interpolants. [2023-12-02 14:11:12,124 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1403, Invalid=2377, Unknown=2, NotChecked=0, Total=3782 [2023-12-02 14:11:12,124 INFO L87 Difference]: Start difference. First operand 64 states and 76 transitions. Second operand has 53 states, 53 states have (on average 1.2830188679245282) internal successors, (68), 53 states have internal predecessors, (68), 1 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2023-12-02 14:11:12,234 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 14:11:12,234 INFO L93 Difference]: Finished difference Result 128 states and 177 transitions. [2023-12-02 14:11:12,234 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 52 states. [2023-12-02 14:11:12,234 INFO L78 Accepts]: Start accepts. Automaton has has 53 states, 53 states have (on average 1.2830188679245282) internal successors, (68), 53 states have internal predecessors, (68), 1 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 45 [2023-12-02 14:11:12,235 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 14:11:12,235 INFO L225 Difference]: With dead ends: 128 [2023-12-02 14:11:12,236 INFO L226 Difference]: Without dead ends: 90 [2023-12-02 14:11:12,237 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 160 GetRequests, 100 SyntacticMatches, 0 SemanticMatches, 60 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 782 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=1403, Invalid=2377, Unknown=2, NotChecked=0, Total=3782 [2023-12-02 14:11:12,238 INFO L413 NwaCegarLoop]: 17 mSDtfsCounter, 0 mSDsluCounter, 68 mSDsCounter, 0 mSdLazyCounter, 108 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 85 SdHoareTripleChecker+Invalid, 109 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 108 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 14:11:12,239 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 85 Invalid, 109 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 108 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 14:11:12,239 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2023-12-02 14:11:12,250 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 90. [2023-12-02 14:11:12,251 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 90 states, 82 states have (on average 1.1219512195121952) internal successors, (92), 83 states have internal predecessors, (92), 5 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (5), 4 states have call predecessors, (5), 5 states have call successors, (5) [2023-12-02 14:11:12,252 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 90 states to 90 states and 102 transitions. [2023-12-02 14:11:12,252 INFO L78 Accepts]: Start accepts. Automaton has 90 states and 102 transitions. Word has length 45 [2023-12-02 14:11:12,252 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 14:11:12,252 INFO L495 AbstractCegarLoop]: Abstraction has 90 states and 102 transitions. [2023-12-02 14:11:12,253 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 53 states, 53 states have (on average 1.2830188679245282) internal successors, (68), 53 states have internal predecessors, (68), 1 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2023-12-02 14:11:12,253 INFO L276 IsEmpty]: Start isEmpty. Operand 90 states and 102 transitions. [2023-12-02 14:11:12,255 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2023-12-02 14:11:12,255 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 14:11:12,255 INFO L195 NwaCegarLoop]: trace histogram [50, 4, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 14:11:12,261 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c1c840c1-aa34-40fb-baa1-4d846780b8b7/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2023-12-02 14:11:12,456 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c1c840c1-aa34-40fb-baa1-4d846780b8b7/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable8 [2023-12-02 14:11:12,457 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 14:11:12,457 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 14:11:12,457 INFO L85 PathProgramCache]: Analyzing trace with hash -982491645, now seen corresponding path program 5 times [2023-12-02 14:11:12,457 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 14:11:12,458 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [626214902] [2023-12-02 14:11:12,458 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:11:12,458 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 14:11:12,540 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:11:14,207 INFO L134 CoverageAnalysis]: Checked inductivity of 1289 backedges. 2 proven. 1275 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2023-12-02 14:11:14,207 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 14:11:14,208 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [626214902] [2023-12-02 14:11:14,208 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [626214902] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 14:11:14,208 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1981348487] [2023-12-02 14:11:14,208 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-12-02 14:11:14,208 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:11:14,208 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c1c840c1-aa34-40fb-baa1-4d846780b8b7/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 14:11:14,209 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c1c840c1-aa34-40fb-baa1-4d846780b8b7/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 14:11:14,210 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c1c840c1-aa34-40fb-baa1-4d846780b8b7/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2023-12-02 14:11:14,331 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2023-12-02 14:11:14,331 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 14:11:14,332 INFO L262 TraceCheckSpWp]: Trace formula consists of 135 conjuncts, 7 conjunts are in the unsatisfiable core [2023-12-02 14:11:14,335 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 14:11:14,480 INFO L134 CoverageAnalysis]: Checked inductivity of 1289 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 1279 trivial. 0 not checked. [2023-12-02 14:11:14,480 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 14:11:14,664 INFO L134 CoverageAnalysis]: Checked inductivity of 1289 backedges. 2 proven. 10 refuted. 0 times theorem prover too weak. 1277 trivial. 0 not checked. [2023-12-02 14:11:14,664 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1981348487] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 14:11:14,664 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1471455981] [2023-12-02 14:11:14,667 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-12-02 14:11:14,667 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 14:11:14,667 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 14:11:14,667 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 14:11:14,668 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 14:11:14,873 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 6 for LOIs [2023-12-02 14:11:14,878 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 14:11:15,253 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3395#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0))' at error location [2023-12-02 14:11:15,253 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 14:11:15,253 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 14:11:15,253 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [53, 8, 8] total 65 [2023-12-02 14:11:15,253 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [733510676] [2023-12-02 14:11:15,253 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 14:11:15,254 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 65 states [2023-12-02 14:11:15,254 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 14:11:15,255 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 65 interpolants. [2023-12-02 14:11:15,257 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1481, Invalid=3916, Unknown=5, NotChecked=0, Total=5402 [2023-12-02 14:11:15,257 INFO L87 Difference]: Start difference. First operand 90 states and 102 transitions. Second operand has 65 states, 65 states have (on average 1.2615384615384615) internal successors, (82), 65 states have internal predecessors, (82), 1 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2023-12-02 14:11:17,203 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 14:11:17,203 INFO L93 Difference]: Finished difference Result 146 states and 185 transitions. [2023-12-02 14:11:17,203 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 70 states. [2023-12-02 14:11:17,203 INFO L78 Accepts]: Start accepts. Automaton has has 65 states, 65 states have (on average 1.2615384615384615) internal successors, (82), 65 states have internal predecessors, (82), 1 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 71 [2023-12-02 14:11:17,204 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 14:11:17,204 INFO L225 Difference]: With dead ends: 146 [2023-12-02 14:11:17,205 INFO L226 Difference]: Without dead ends: 108 [2023-12-02 14:11:17,211 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 330 GetRequests, 192 SyntacticMatches, 0 SemanticMatches, 138 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3787 ImplicationChecksByTransitivity, 3.4s TimeCoverageRelationStatistics Valid=4506, Invalid=14915, Unknown=39, NotChecked=0, Total=19460 [2023-12-02 14:11:17,211 INFO L413 NwaCegarLoop]: 13 mSDtfsCounter, 83 mSDsluCounter, 154 mSDsCounter, 0 mSdLazyCounter, 262 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 86 SdHoareTripleChecker+Valid, 167 SdHoareTripleChecker+Invalid, 265 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 262 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-12-02 14:11:17,211 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [86 Valid, 167 Invalid, 265 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 262 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-12-02 14:11:17,212 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 108 states. [2023-12-02 14:11:17,224 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 108 to 100. [2023-12-02 14:11:17,224 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 100 states, 92 states have (on average 1.108695652173913) internal successors, (102), 93 states have internal predecessors, (102), 5 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (5), 4 states have call predecessors, (5), 5 states have call successors, (5) [2023-12-02 14:11:17,225 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 100 states to 100 states and 112 transitions. [2023-12-02 14:11:17,225 INFO L78 Accepts]: Start accepts. Automaton has 100 states and 112 transitions. Word has length 71 [2023-12-02 14:11:17,225 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 14:11:17,225 INFO L495 AbstractCegarLoop]: Abstraction has 100 states and 112 transitions. [2023-12-02 14:11:17,226 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 65 states, 65 states have (on average 1.2615384615384615) internal successors, (82), 65 states have internal predecessors, (82), 1 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2023-12-02 14:11:17,226 INFO L276 IsEmpty]: Start isEmpty. Operand 100 states and 112 transitions. [2023-12-02 14:11:17,227 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 79 [2023-12-02 14:11:17,227 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 14:11:17,227 INFO L195 NwaCegarLoop]: trace histogram [51, 10, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 14:11:17,232 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c1c840c1-aa34-40fb-baa1-4d846780b8b7/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Ended with exit code 0 [2023-12-02 14:11:17,428 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c1c840c1-aa34-40fb-baa1-4d846780b8b7/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2023-12-02 14:11:17,428 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 14:11:17,428 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 14:11:17,428 INFO L85 PathProgramCache]: Analyzing trace with hash 77926762, now seen corresponding path program 6 times [2023-12-02 14:11:17,428 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 14:11:17,429 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [746687656] [2023-12-02 14:11:17,429 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:11:17,429 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 14:11:17,480 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:11:19,212 INFO L134 CoverageAnalysis]: Checked inductivity of 1385 backedges. 2 proven. 1326 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2023-12-02 14:11:19,212 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 14:11:19,212 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [746687656] [2023-12-02 14:11:19,212 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [746687656] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 14:11:19,212 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1984680952] [2023-12-02 14:11:19,213 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-12-02 14:11:19,213 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:11:19,213 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c1c840c1-aa34-40fb-baa1-4d846780b8b7/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 14:11:19,214 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c1c840c1-aa34-40fb-baa1-4d846780b8b7/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 14:11:19,215 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c1c840c1-aa34-40fb-baa1-4d846780b8b7/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2023-12-02 14:11:19,411 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-12-02 14:11:19,411 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 14:11:19,414 INFO L262 TraceCheckSpWp]: Trace formula consists of 582 conjuncts, 53 conjunts are in the unsatisfiable core [2023-12-02 14:11:19,417 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 14:11:19,490 INFO L134 CoverageAnalysis]: Checked inductivity of 1385 backedges. 0 proven. 1326 refuted. 0 times theorem prover too weak. 59 trivial. 0 not checked. [2023-12-02 14:11:19,490 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 14:11:22,083 INFO L134 CoverageAnalysis]: Checked inductivity of 1385 backedges. 2 proven. 1326 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2023-12-02 14:11:22,083 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1984680952] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 14:11:22,083 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [679290692] [2023-12-02 14:11:22,085 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-12-02 14:11:22,085 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 14:11:22,085 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 14:11:22,085 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 14:11:22,086 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 14:11:22,240 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 6 for LOIs [2023-12-02 14:11:22,268 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 14:11:22,572 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4557#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0))' at error location [2023-12-02 14:11:22,572 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 14:11:22,572 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 14:11:22,572 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [54, 53, 54] total 107 [2023-12-02 14:11:22,572 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1586940533] [2023-12-02 14:11:22,573 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 14:11:22,573 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 107 states [2023-12-02 14:11:22,573 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 14:11:22,576 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 107 interpolants. [2023-12-02 14:11:22,579 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5696, Invalid=7642, Unknown=2, NotChecked=0, Total=13340 [2023-12-02 14:11:22,580 INFO L87 Difference]: Start difference. First operand 100 states and 112 transitions. Second operand has 107 states, 107 states have (on average 1.1401869158878504) internal successors, (122), 107 states have internal predecessors, (122), 1 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2023-12-02 14:11:22,749 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 14:11:22,749 INFO L93 Difference]: Finished difference Result 200 states and 276 transitions. [2023-12-02 14:11:22,749 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 106 states. [2023-12-02 14:11:22,749 INFO L78 Accepts]: Start accepts. Automaton has has 107 states, 107 states have (on average 1.1401869158878504) internal successors, (122), 107 states have internal predecessors, (122), 1 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 78 [2023-12-02 14:11:22,750 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 14:11:22,750 INFO L225 Difference]: With dead ends: 200 [2023-12-02 14:11:22,751 INFO L226 Difference]: Without dead ends: 153 [2023-12-02 14:11:22,754 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 286 GetRequests, 172 SyntacticMatches, 0 SemanticMatches, 114 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1618 ImplicationChecksByTransitivity, 3.7s TimeCoverageRelationStatistics Valid=5696, Invalid=7642, Unknown=2, NotChecked=0, Total=13340 [2023-12-02 14:11:22,755 INFO L413 NwaCegarLoop]: 17 mSDtfsCounter, 0 mSDsluCounter, 51 mSDsCounter, 0 mSdLazyCounter, 151 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 68 SdHoareTripleChecker+Invalid, 152 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 151 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 14:11:22,755 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 68 Invalid, 152 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 151 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 14:11:22,756 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 153 states. [2023-12-02 14:11:22,773 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 153 to 153. [2023-12-02 14:11:22,773 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 153 states, 145 states have (on average 1.0689655172413792) internal successors, (155), 146 states have internal predecessors, (155), 5 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (5), 4 states have call predecessors, (5), 5 states have call successors, (5) [2023-12-02 14:11:22,774 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 153 states to 153 states and 165 transitions. [2023-12-02 14:11:22,774 INFO L78 Accepts]: Start accepts. Automaton has 153 states and 165 transitions. Word has length 78 [2023-12-02 14:11:22,774 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 14:11:22,774 INFO L495 AbstractCegarLoop]: Abstraction has 153 states and 165 transitions. [2023-12-02 14:11:22,774 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 107 states, 107 states have (on average 1.1401869158878504) internal successors, (122), 107 states have internal predecessors, (122), 1 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2023-12-02 14:11:22,775 INFO L276 IsEmpty]: Start isEmpty. Operand 153 states and 165 transitions. [2023-12-02 14:11:22,777 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 132 [2023-12-02 14:11:22,777 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 14:11:22,777 INFO L195 NwaCegarLoop]: trace histogram [104, 10, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 14:11:22,784 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c1c840c1-aa34-40fb-baa1-4d846780b8b7/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Ended with exit code 0 [2023-12-02 14:11:22,977 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c1c840c1-aa34-40fb-baa1-4d846780b8b7/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2023-12-02 14:11:22,977 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 14:11:22,978 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 14:11:22,978 INFO L85 PathProgramCache]: Analyzing trace with hash 2133377379, now seen corresponding path program 7 times [2023-12-02 14:11:22,978 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 14:11:22,978 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1316296016] [2023-12-02 14:11:22,978 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:11:22,978 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 14:11:23,101 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:11:29,086 INFO L134 CoverageAnalysis]: Checked inductivity of 5519 backedges. 2 proven. 5460 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2023-12-02 14:11:29,086 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 14:11:29,086 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1316296016] [2023-12-02 14:11:29,086 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1316296016] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 14:11:29,086 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [342009044] [2023-12-02 14:11:29,087 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-12-02 14:11:29,087 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:11:29,087 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c1c840c1-aa34-40fb-baa1-4d846780b8b7/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 14:11:29,088 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c1c840c1-aa34-40fb-baa1-4d846780b8b7/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 14:11:29,088 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c1c840c1-aa34-40fb-baa1-4d846780b8b7/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2023-12-02 14:11:29,342 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:11:29,348 INFO L262 TraceCheckSpWp]: Trace formula consists of 1059 conjuncts, 106 conjunts are in the unsatisfiable core [2023-12-02 14:11:29,353 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 14:11:29,476 INFO L134 CoverageAnalysis]: Checked inductivity of 5519 backedges. 0 proven. 5460 refuted. 0 times theorem prover too weak. 59 trivial. 0 not checked. [2023-12-02 14:11:29,476 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 14:11:39,583 INFO L134 CoverageAnalysis]: Checked inductivity of 5519 backedges. 2 proven. 5460 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2023-12-02 14:11:39,583 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [342009044] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 14:11:39,583 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1741178308] [2023-12-02 14:11:39,585 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-12-02 14:11:39,585 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 14:11:39,585 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 14:11:39,586 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 14:11:39,586 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 14:11:39,756 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 6 for LOIs [2023-12-02 14:11:39,760 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 14:11:40,335 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '6227#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0))' at error location [2023-12-02 14:11:40,335 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 14:11:40,336 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 14:11:40,336 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [107, 106, 107] total 213 [2023-12-02 14:11:40,336 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [292369380] [2023-12-02 14:11:40,336 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 14:11:40,337 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 213 states [2023-12-02 14:11:40,337 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 14:11:40,343 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 213 interpolants. [2023-12-02 14:11:40,349 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=22603, Invalid=26452, Unknown=7, NotChecked=0, Total=49062 [2023-12-02 14:11:40,349 INFO L87 Difference]: Start difference. First operand 153 states and 165 transitions. Second operand has 213 states, 213 states have (on average 1.0704225352112675) internal successors, (228), 213 states have internal predecessors, (228), 1 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2023-12-02 14:11:40,899 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 14:11:40,899 INFO L93 Difference]: Finished difference Result 306 states and 435 transitions. [2023-12-02 14:11:40,899 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 212 states. [2023-12-02 14:11:40,899 INFO L78 Accepts]: Start accepts. Automaton has has 213 states, 213 states have (on average 1.0704225352112675) internal successors, (228), 213 states have internal predecessors, (228), 1 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 131 [2023-12-02 14:11:40,900 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 14:11:40,901 INFO L225 Difference]: With dead ends: 306 [2023-12-02 14:11:40,902 INFO L226 Difference]: Without dead ends: 259 [2023-12-02 14:11:40,904 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 498 GetRequests, 278 SyntacticMatches, 0 SemanticMatches, 220 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3260 ImplicationChecksByTransitivity, 14.1s TimeCoverageRelationStatistics Valid=22603, Invalid=26452, Unknown=7, NotChecked=0, Total=49062 [2023-12-02 14:11:40,905 INFO L413 NwaCegarLoop]: 17 mSDtfsCounter, 0 mSDsluCounter, 102 mSDsCounter, 0 mSdLazyCounter, 289 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 119 SdHoareTripleChecker+Invalid, 290 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 289 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-12-02 14:11:40,905 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 119 Invalid, 290 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 289 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-12-02 14:11:40,906 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 259 states. [2023-12-02 14:11:40,929 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 259 to 259. [2023-12-02 14:11:40,930 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 259 states, 251 states have (on average 1.0398406374501992) internal successors, (261), 252 states have internal predecessors, (261), 5 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (5), 4 states have call predecessors, (5), 5 states have call successors, (5) [2023-12-02 14:11:40,931 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 259 states to 259 states and 271 transitions. [2023-12-02 14:11:40,932 INFO L78 Accepts]: Start accepts. Automaton has 259 states and 271 transitions. Word has length 131 [2023-12-02 14:11:40,932 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 14:11:40,932 INFO L495 AbstractCegarLoop]: Abstraction has 259 states and 271 transitions. [2023-12-02 14:11:40,933 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 213 states, 213 states have (on average 1.0704225352112675) internal successors, (228), 213 states have internal predecessors, (228), 1 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2023-12-02 14:11:40,933 INFO L276 IsEmpty]: Start isEmpty. Operand 259 states and 271 transitions. [2023-12-02 14:11:40,936 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 238 [2023-12-02 14:11:40,937 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 14:11:40,937 INFO L195 NwaCegarLoop]: trace histogram [210, 10, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 14:11:40,944 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c1c840c1-aa34-40fb-baa1-4d846780b8b7/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Ended with exit code 0 [2023-12-02 14:11:41,137 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c1c840c1-aa34-40fb-baa1-4d846780b8b7/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:11:41,137 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 14:11:41,138 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 14:11:41,138 INFO L85 PathProgramCache]: Analyzing trace with hash 219020227, now seen corresponding path program 8 times [2023-12-02 14:11:41,138 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 14:11:41,138 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1105538235] [2023-12-02 14:11:41,138 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:11:41,138 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 14:11:41,445 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:12:03,499 INFO L134 CoverageAnalysis]: Checked inductivity of 22214 backedges. 2 proven. 22155 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2023-12-02 14:12:03,499 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 14:12:03,499 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1105538235] [2023-12-02 14:12:03,500 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1105538235] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 14:12:03,500 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2133105793] [2023-12-02 14:12:03,500 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-12-02 14:12:03,500 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:12:03,500 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c1c840c1-aa34-40fb-baa1-4d846780b8b7/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 14:12:03,501 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c1c840c1-aa34-40fb-baa1-4d846780b8b7/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 14:12:03,502 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c1c840c1-aa34-40fb-baa1-4d846780b8b7/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2023-12-02 14:12:03,929 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2023-12-02 14:12:03,929 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 14:12:03,933 INFO L262 TraceCheckSpWp]: Trace formula consists of 213 conjuncts, 13 conjunts are in the unsatisfiable core [2023-12-02 14:12:03,938 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 14:12:04,961 INFO L134 CoverageAnalysis]: Checked inductivity of 22214 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 22159 trivial. 0 not checked. [2023-12-02 14:12:04,961 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 14:12:06,094 INFO L134 CoverageAnalysis]: Checked inductivity of 22214 backedges. 2 proven. 55 refuted. 0 times theorem prover too weak. 22157 trivial. 0 not checked. [2023-12-02 14:12:06,094 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2133105793] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 14:12:06,095 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1838592239] [2023-12-02 14:12:06,096 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-12-02 14:12:06,096 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 14:12:06,097 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 14:12:06,097 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 14:12:06,097 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 14:12:06,277 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 6 for LOIs [2023-12-02 14:12:06,283 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 14:12:07,743 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '8981#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0))' at error location [2023-12-02 14:12:07,743 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 14:12:07,744 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 14:12:07,744 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [213, 14, 14] total 237 [2023-12-02 14:12:07,744 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [904408419] [2023-12-02 14:12:07,744 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 14:12:07,745 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 237 states [2023-12-02 14:12:07,745 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 14:12:07,750 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 237 interpolants. [2023-12-02 14:12:07,753 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=22891, Invalid=37366, Unknown=13, NotChecked=0, Total=60270 [2023-12-02 14:12:07,754 INFO L87 Difference]: Start difference. First operand 259 states and 271 transitions. Second operand has 237 states, 237 states have (on average 1.0717299578059072) internal successors, (254), 237 states have internal predecessors, (254), 1 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2023-12-02 14:12:30,181 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 14:12:30,181 INFO L93 Difference]: Finished difference Result 333 states and 381 transitions. [2023-12-02 14:12:30,182 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 248 states. [2023-12-02 14:12:30,182 INFO L78 Accepts]: Start accepts. Automaton has has 237 states, 237 states have (on average 1.0717299578059072) internal successors, (254), 237 states have internal predecessors, (254), 1 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 237 [2023-12-02 14:12:30,183 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 14:12:30,184 INFO L225 Difference]: With dead ends: 333 [2023-12-02 14:12:30,184 INFO L226 Difference]: Without dead ends: 286 [2023-12-02 14:12:30,194 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1166 GetRequests, 678 SyntacticMatches, 0 SemanticMatches, 488 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 39879 ImplicationChecksByTransitivity, 39.1s TimeCoverageRelationStatistics Valid=69169, Invalid=170249, Unknown=192, NotChecked=0, Total=239610 [2023-12-02 14:12:30,194 INFO L413 NwaCegarLoop]: 14 mSDtfsCounter, 501 mSDsluCounter, 125 mSDsCounter, 0 mSdLazyCounter, 411 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 504 SdHoareTripleChecker+Valid, 139 SdHoareTripleChecker+Invalid, 416 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 411 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-12-02 14:12:30,194 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [504 Valid, 139 Invalid, 416 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 411 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2023-12-02 14:12:30,195 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 286 states. [2023-12-02 14:12:30,217 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 286 to 278. [2023-12-02 14:12:30,217 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 278 states, 270 states have (on average 1.037037037037037) internal successors, (280), 271 states have internal predecessors, (280), 5 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (5), 4 states have call predecessors, (5), 5 states have call successors, (5) [2023-12-02 14:12:30,218 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 278 states to 278 states and 290 transitions. [2023-12-02 14:12:30,219 INFO L78 Accepts]: Start accepts. Automaton has 278 states and 290 transitions. Word has length 237 [2023-12-02 14:12:30,219 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 14:12:30,219 INFO L495 AbstractCegarLoop]: Abstraction has 278 states and 290 transitions. [2023-12-02 14:12:30,219 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 237 states, 237 states have (on average 1.0717299578059072) internal successors, (254), 237 states have internal predecessors, (254), 1 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2023-12-02 14:12:30,220 INFO L276 IsEmpty]: Start isEmpty. Operand 278 states and 290 transitions. [2023-12-02 14:12:30,222 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 251 [2023-12-02 14:12:30,222 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 14:12:30,222 INFO L195 NwaCegarLoop]: trace histogram [211, 22, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 14:12:30,227 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c1c840c1-aa34-40fb-baa1-4d846780b8b7/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Ended with exit code 0 [2023-12-02 14:12:30,422 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12,13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c1c840c1-aa34-40fb-baa1-4d846780b8b7/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:12:30,423 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 14:12:30,423 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 14:12:30,424 INFO L85 PathProgramCache]: Analyzing trace with hash 1224509546, now seen corresponding path program 9 times [2023-12-02 14:12:30,424 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 14:12:30,424 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [994888008] [2023-12-02 14:12:30,424 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:12:30,424 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 14:12:30,723 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:12:54,656 INFO L134 CoverageAnalysis]: Checked inductivity of 22623 backedges. 2 proven. 22366 refuted. 0 times theorem prover too weak. 255 trivial. 0 not checked. [2023-12-02 14:12:54,657 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 14:12:54,657 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [994888008] [2023-12-02 14:12:54,657 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [994888008] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 14:12:54,657 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [503031423] [2023-12-02 14:12:54,657 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-12-02 14:12:54,657 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:12:54,657 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c1c840c1-aa34-40fb-baa1-4d846780b8b7/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 14:12:54,658 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c1c840c1-aa34-40fb-baa1-4d846780b8b7/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 14:12:54,659 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c1c840c1-aa34-40fb-baa1-4d846780b8b7/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2023-12-02 14:12:55,185 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-12-02 14:12:55,185 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 14:12:55,200 INFO L262 TraceCheckSpWp]: Trace formula consists of 2070 conjuncts, 213 conjunts are in the unsatisfiable core [2023-12-02 14:12:55,210 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 14:12:55,535 INFO L134 CoverageAnalysis]: Checked inductivity of 22623 backedges. 0 proven. 22366 refuted. 0 times theorem prover too weak. 257 trivial. 0 not checked. [2023-12-02 14:12:55,535 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 14:13:41,645 INFO L134 CoverageAnalysis]: Checked inductivity of 22623 backedges. 2 proven. 22366 refuted. 0 times theorem prover too weak. 255 trivial. 0 not checked. [2023-12-02 14:13:41,645 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [503031423] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 14:13:41,646 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1749472420] [2023-12-02 14:13:41,648 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-12-02 14:13:41,648 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 14:13:41,648 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 14:13:41,648 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 14:13:41,648 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 14:13:41,813 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 6 for LOIs [2023-12-02 14:13:41,817 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 14:13:42,883 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '12581#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0))' at error location [2023-12-02 14:13:42,884 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 14:13:42,884 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 14:13:42,884 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [214, 213, 214] total 427 [2023-12-02 14:13:42,884 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1010831976] [2023-12-02 14:13:42,884 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 14:13:42,886 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 427 states [2023-12-02 14:13:42,886 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 14:13:42,907 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 427 interpolants. [2023-12-02 14:13:42,924 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=90976, Invalid=98679, Unknown=5, NotChecked=0, Total=189660 [2023-12-02 14:13:42,925 INFO L87 Difference]: Start difference. First operand 278 states and 290 transitions. Second operand has 427 states, 427 states have (on average 1.035128805620609) internal successors, (442), 427 states have internal predecessors, (442), 1 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2023-12-02 14:13:46,271 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 14:13:46,271 INFO L93 Difference]: Finished difference Result 556 states and 792 transitions. [2023-12-02 14:13:46,272 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 426 states. [2023-12-02 14:13:46,273 INFO L78 Accepts]: Start accepts. Automaton has has 427 states, 427 states have (on average 1.035128805620609) internal successors, (442), 427 states have internal predecessors, (442), 1 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 250 [2023-12-02 14:13:46,273 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 14:13:46,277 INFO L225 Difference]: With dead ends: 556 [2023-12-02 14:13:46,277 INFO L226 Difference]: Without dead ends: 491 [2023-12-02 14:13:46,287 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 962 GetRequests, 528 SyntacticMatches, 0 SemanticMatches, 434 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6579 ImplicationChecksByTransitivity, 61.5s TimeCoverageRelationStatistics Valid=90976, Invalid=98679, Unknown=5, NotChecked=0, Total=189660 [2023-12-02 14:13:46,288 INFO L413 NwaCegarLoop]: 17 mSDtfsCounter, 0 mSDsluCounter, 119 mSDsCounter, 0 mSdLazyCounter, 515 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 136 SdHoareTripleChecker+Invalid, 516 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 515 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2023-12-02 14:13:46,288 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 136 Invalid, 516 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 515 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2023-12-02 14:13:46,289 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 491 states. [2023-12-02 14:13:46,344 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 491 to 491. [2023-12-02 14:13:46,344 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 491 states, 483 states have (on average 1.020703933747412) internal successors, (493), 484 states have internal predecessors, (493), 5 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (5), 4 states have call predecessors, (5), 5 states have call successors, (5) [2023-12-02 14:13:46,347 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 491 states to 491 states and 503 transitions. [2023-12-02 14:13:46,347 INFO L78 Accepts]: Start accepts. Automaton has 491 states and 503 transitions. Word has length 250 [2023-12-02 14:13:46,348 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 14:13:46,348 INFO L495 AbstractCegarLoop]: Abstraction has 491 states and 503 transitions. [2023-12-02 14:13:46,349 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 427 states, 427 states have (on average 1.035128805620609) internal successors, (442), 427 states have internal predecessors, (442), 1 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2023-12-02 14:13:46,349 INFO L276 IsEmpty]: Start isEmpty. Operand 491 states and 503 transitions. [2023-12-02 14:13:46,357 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 464 [2023-12-02 14:13:46,357 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 14:13:46,358 INFO L195 NwaCegarLoop]: trace histogram [424, 22, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 14:13:46,367 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c1c840c1-aa34-40fb-baa1-4d846780b8b7/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Ended with exit code 0 [2023-12-02 14:13:46,558 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13,14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c1c840c1-aa34-40fb-baa1-4d846780b8b7/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:13:46,558 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 14:13:46,559 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 14:13:46,559 INFO L85 PathProgramCache]: Analyzing trace with hash 1879973091, now seen corresponding path program 10 times [2023-12-02 14:13:46,559 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 14:13:46,559 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [427736179] [2023-12-02 14:13:46,559 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:13:46,559 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 14:13:47,549 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:15:35,069 INFO L134 CoverageAnalysis]: Checked inductivity of 90357 backedges. 2 proven. 90100 refuted. 0 times theorem prover too weak. 255 trivial. 0 not checked. [2023-12-02 14:15:35,069 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 14:15:35,070 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [427736179] [2023-12-02 14:15:35,070 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [427736179] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 14:15:35,070 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1810046496] [2023-12-02 14:15:35,070 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-12-02 14:15:35,070 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 14:15:35,070 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c1c840c1-aa34-40fb-baa1-4d846780b8b7/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 14:15:35,071 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c1c840c1-aa34-40fb-baa1-4d846780b8b7/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 14:15:35,072 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c1c840c1-aa34-40fb-baa1-4d846780b8b7/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2023-12-02 14:15:36,045 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 14:15:36,077 INFO L262 TraceCheckSpWp]: Trace formula consists of 3987 conjuncts, 426 conjunts are in the unsatisfiable core [2023-12-02 14:15:36,094 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 14:15:36,654 INFO L134 CoverageAnalysis]: Checked inductivity of 90357 backedges. 0 proven. 90100 refuted. 0 times theorem prover too weak. 257 trivial. 0 not checked. [2023-12-02 14:15:36,654 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 14:18:37,748 INFO L134 CoverageAnalysis]: Checked inductivity of 90357 backedges. 2 proven. 90100 refuted. 0 times theorem prover too weak. 255 trivial. 0 not checked. [2023-12-02 14:18:37,749 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1810046496] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 14:18:37,749 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [935973933] [2023-12-02 14:18:37,750 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-12-02 14:18:37,750 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 14:18:37,750 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 14:18:37,751 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 14:18:37,751 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 14:18:37,893 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 6 for LOIs [2023-12-02 14:18:37,896 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 14:18:39,650 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '18271#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0))' at error location [2023-12-02 14:18:39,650 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 14:18:39,650 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 14:18:39,651 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [427, 426, 427] total 853 [2023-12-02 14:18:39,651 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1784779137] [2023-12-02 14:18:39,651 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 14:18:39,653 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 853 states [2023-12-02 14:18:39,654 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 14:18:39,699 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 853 interpolants. [2023-12-02 14:18:39,732 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=363403, Invalid=378773, Unknown=6, NotChecked=0, Total=742182 [2023-12-02 14:18:39,734 INFO L87 Difference]: Start difference. First operand 491 states and 503 transitions. Second operand has 853 states, 853 states have (on average 1.0175849941383353) internal successors, (868), 853 states have internal predecessors, (868), 1 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2023-12-02 14:18:56,354 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 14:18:56,354 INFO L93 Difference]: Finished difference Result 982 states and 1431 transitions. [2023-12-02 14:18:56,355 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 852 states. [2023-12-02 14:18:56,356 INFO L78 Accepts]: Start accepts. Automaton has has 853 states, 853 states have (on average 1.0175849941383353) internal successors, (868), 853 states have internal predecessors, (868), 1 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 463 [2023-12-02 14:18:56,357 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 14:18:56,362 INFO L225 Difference]: With dead ends: 982 [2023-12-02 14:18:56,362 INFO L226 Difference]: Without dead ends: 917 [2023-12-02 14:18:56,394 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1814 GetRequests, 954 SyntacticMatches, 0 SemanticMatches, 860 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 13180 ImplicationChecksByTransitivity, 243.1s TimeCoverageRelationStatistics Valid=363403, Invalid=378773, Unknown=6, NotChecked=0, Total=742182 [2023-12-02 14:18:56,394 INFO L413 NwaCegarLoop]: 17 mSDtfsCounter, 0 mSDsluCounter, 102 mSDsCounter, 0 mSdLazyCounter, 930 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 119 SdHoareTripleChecker+Invalid, 931 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 930 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2023-12-02 14:18:56,394 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 119 Invalid, 931 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 930 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2023-12-02 14:18:56,395 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 917 states. [2023-12-02 14:18:56,465 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 917 to 917. [2023-12-02 14:18:56,466 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 917 states, 909 states have (on average 1.011001100110011) internal successors, (919), 910 states have internal predecessors, (919), 5 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (5), 4 states have call predecessors, (5), 5 states have call successors, (5) [2023-12-02 14:18:56,469 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 917 states to 917 states and 929 transitions. [2023-12-02 14:18:56,470 INFO L78 Accepts]: Start accepts. Automaton has 917 states and 929 transitions. Word has length 463 [2023-12-02 14:18:56,470 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 14:18:56,470 INFO L495 AbstractCegarLoop]: Abstraction has 917 states and 929 transitions. [2023-12-02 14:18:56,471 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 853 states, 853 states have (on average 1.0175849941383353) internal successors, (868), 853 states have internal predecessors, (868), 1 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2023-12-02 14:18:56,471 INFO L276 IsEmpty]: Start isEmpty. Operand 917 states and 929 transitions. [2023-12-02 14:18:56,478 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 890 [2023-12-02 14:18:56,478 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 14:18:56,478 INFO L195 NwaCegarLoop]: trace histogram [850, 22, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 14:18:56,491 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c1c840c1-aa34-40fb-baa1-4d846780b8b7/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Ended with exit code 0 [2023-12-02 14:18:56,679 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_c1c840c1-aa34-40fb-baa1-4d846780b8b7/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2023-12-02 14:18:56,679 INFO L420 AbstractCegarLoop]: === Iteration 16 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 14:18:56,679 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 14:18:56,679 INFO L85 PathProgramCache]: Analyzing trace with hash 96490307, now seen corresponding path program 11 times [2023-12-02 14:18:56,680 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 14:18:56,680 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1280977543] [2023-12-02 14:18:56,680 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 14:18:56,680 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 14:19:00,512 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat