./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/array-fpi/s1lif.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version cf1a7837 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_e3ac585f-7e94-404d-aa2b-e34cc2092d0e/bin/utaipan-verify-NcY6lQBIFX/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e3ac585f-7e94-404d-aa2b-e34cc2092d0e/bin/utaipan-verify-NcY6lQBIFX/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e3ac585f-7e94-404d-aa2b-e34cc2092d0e/bin/utaipan-verify-NcY6lQBIFX/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e3ac585f-7e94-404d-aa2b-e34cc2092d0e/bin/utaipan-verify-NcY6lQBIFX/config/TaipanReach.xml -i ../../sv-benchmarks/c/array-fpi/s1lif.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e3ac585f-7e94-404d-aa2b-e34cc2092d0e/bin/utaipan-verify-NcY6lQBIFX/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e3ac585f-7e94-404d-aa2b-e34cc2092d0e/bin/utaipan-verify-NcY6lQBIFX --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 cdcd45f06ced2bb4437693c85186d4d1862b19794596dce357397727796a8cdf --- Real Ultimate output --- This is Ultimate 0.2.3-dev-cf1a783 [2023-11-12 00:11:38,325 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-11-12 00:11:38,398 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e3ac585f-7e94-404d-aa2b-e34cc2092d0e/bin/utaipan-verify-NcY6lQBIFX/config/svcomp-Reach-32bit-Taipan_Default.epf [2023-11-12 00:11:38,403 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-11-12 00:11:38,404 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-11-12 00:11:38,431 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-11-12 00:11:38,432 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-11-12 00:11:38,433 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-11-12 00:11:38,433 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-11-12 00:11:38,434 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-11-12 00:11:38,434 INFO L153 SettingsManager]: * User list type=DISABLED [2023-11-12 00:11:38,435 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-11-12 00:11:38,436 INFO L153 SettingsManager]: * Explicit value domain=true [2023-11-12 00:11:38,436 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-11-12 00:11:38,437 INFO L153 SettingsManager]: * Octagon Domain=false [2023-11-12 00:11:38,437 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-11-12 00:11:38,438 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-11-12 00:11:38,438 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-11-12 00:11:38,439 INFO L153 SettingsManager]: * Interval Domain=false [2023-11-12 00:11:38,439 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-11-12 00:11:38,440 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-11-12 00:11:38,440 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2023-11-12 00:11:38,441 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-11-12 00:11:38,441 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-11-12 00:11:38,442 INFO L153 SettingsManager]: * sizeof long=4 [2023-11-12 00:11:38,442 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-11-12 00:11:38,443 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-11-12 00:11:38,443 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-11-12 00:11:38,443 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-11-12 00:11:38,444 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-11-12 00:11:38,444 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-11-12 00:11:38,444 INFO L153 SettingsManager]: * sizeof long double=12 [2023-11-12 00:11:38,445 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2023-11-12 00:11:38,445 INFO L153 SettingsManager]: * Use constant arrays=true [2023-11-12 00:11:38,446 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-11-12 00:11:38,446 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-11-12 00:11:38,446 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-12 00:11:38,446 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-11-12 00:11:38,447 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-11-12 00:11:38,447 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2023-11-12 00:11:38,447 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-11-12 00:11:38,447 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-11-12 00:11:38,448 INFO L153 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-11-12 00:11:38,448 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-11-12 00:11:38,448 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-11-12 00:11:38,448 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_e3ac585f-7e94-404d-aa2b-e34cc2092d0e/bin/utaipan-verify-NcY6lQBIFX/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e3ac585f-7e94-404d-aa2b-e34cc2092d0e/bin/utaipan-verify-NcY6lQBIFX Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> cdcd45f06ced2bb4437693c85186d4d1862b19794596dce357397727796a8cdf [2023-11-12 00:11:38,701 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-11-12 00:11:38,725 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-11-12 00:11:38,730 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-11-12 00:11:38,732 INFO L270 PluginConnector]: Initializing CDTParser... [2023-11-12 00:11:38,732 INFO L274 PluginConnector]: CDTParser initialized [2023-11-12 00:11:38,735 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e3ac585f-7e94-404d-aa2b-e34cc2092d0e/bin/utaipan-verify-NcY6lQBIFX/../../sv-benchmarks/c/array-fpi/s1lif.c [2023-11-12 00:11:41,915 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-11-12 00:11:42,116 INFO L384 CDTParser]: Found 1 translation units. [2023-11-12 00:11:42,117 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e3ac585f-7e94-404d-aa2b-e34cc2092d0e/sv-benchmarks/c/array-fpi/s1lif.c [2023-11-12 00:11:42,125 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e3ac585f-7e94-404d-aa2b-e34cc2092d0e/bin/utaipan-verify-NcY6lQBIFX/data/e49c0a3e6/16e2ef12ed3a46b18b19f0a85679ae06/FLAGd8ea6342a [2023-11-12 00:11:42,141 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e3ac585f-7e94-404d-aa2b-e34cc2092d0e/bin/utaipan-verify-NcY6lQBIFX/data/e49c0a3e6/16e2ef12ed3a46b18b19f0a85679ae06 [2023-11-12 00:11:42,144 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-11-12 00:11:42,145 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-11-12 00:11:42,147 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-11-12 00:11:42,147 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-11-12 00:11:42,152 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-11-12 00:11:42,153 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 12.11 12:11:42" (1/1) ... [2023-11-12 00:11:42,154 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@6e5264e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:11:42, skipping insertion in model container [2023-11-12 00:11:42,155 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 12.11 12:11:42" (1/1) ... [2023-11-12 00:11:42,176 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-11-12 00:11:42,348 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_e3ac585f-7e94-404d-aa2b-e34cc2092d0e/sv-benchmarks/c/array-fpi/s1lif.c[588,601] [2023-11-12 00:11:42,371 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-12 00:11:42,382 INFO L202 MainTranslator]: Completed pre-run [2023-11-12 00:11:42,396 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_e3ac585f-7e94-404d-aa2b-e34cc2092d0e/sv-benchmarks/c/array-fpi/s1lif.c[588,601] [2023-11-12 00:11:42,405 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-12 00:11:42,421 INFO L206 MainTranslator]: Completed translation [2023-11-12 00:11:42,422 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:11:42 WrapperNode [2023-11-12 00:11:42,422 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-11-12 00:11:42,423 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-11-12 00:11:42,423 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-11-12 00:11:42,424 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-11-12 00:11:42,431 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:11:42" (1/1) ... [2023-11-12 00:11:42,440 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:11:42" (1/1) ... [2023-11-12 00:11:42,463 INFO L138 Inliner]: procedures = 17, calls = 32, calls flagged for inlining = 4, calls inlined = 4, statements flattened = 89 [2023-11-12 00:11:42,465 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-11-12 00:11:42,465 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-11-12 00:11:42,466 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-11-12 00:11:42,466 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-11-12 00:11:42,476 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:11:42" (1/1) ... [2023-11-12 00:11:42,477 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:11:42" (1/1) ... [2023-11-12 00:11:42,482 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:11:42" (1/1) ... [2023-11-12 00:11:42,482 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:11:42" (1/1) ... [2023-11-12 00:11:42,490 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:11:42" (1/1) ... [2023-11-12 00:11:42,499 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:11:42" (1/1) ... [2023-11-12 00:11:42,504 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:11:42" (1/1) ... [2023-11-12 00:11:42,512 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:11:42" (1/1) ... [2023-11-12 00:11:42,514 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-11-12 00:11:42,515 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-11-12 00:11:42,521 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-11-12 00:11:42,521 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-11-12 00:11:42,522 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:11:42" (1/1) ... [2023-11-12 00:11:42,532 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-12 00:11:42,546 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e3ac585f-7e94-404d-aa2b-e34cc2092d0e/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 00:11:42,571 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e3ac585f-7e94-404d-aa2b-e34cc2092d0e/bin/utaipan-verify-NcY6lQBIFX/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-11-12 00:11:42,592 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e3ac585f-7e94-404d-aa2b-e34cc2092d0e/bin/utaipan-verify-NcY6lQBIFX/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-11-12 00:11:42,618 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-11-12 00:11:42,619 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-11-12 00:11:42,619 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2023-11-12 00:11:42,619 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-11-12 00:11:42,620 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2023-11-12 00:11:42,620 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-11-12 00:11:42,622 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-11-12 00:11:42,622 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-11-12 00:11:42,623 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-11-12 00:11:42,719 INFO L236 CfgBuilder]: Building ICFG [2023-11-12 00:11:42,721 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2023-11-12 00:11:42,999 INFO L277 CfgBuilder]: Performing block encoding [2023-11-12 00:11:43,062 INFO L297 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-11-12 00:11:43,062 INFO L302 CfgBuilder]: Removed 3 assume(true) statements. [2023-11-12 00:11:43,065 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 12.11 12:11:43 BoogieIcfgContainer [2023-11-12 00:11:43,065 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-11-12 00:11:43,074 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-11-12 00:11:43,074 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-11-12 00:11:43,078 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-11-12 00:11:43,079 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 12.11 12:11:42" (1/3) ... [2023-11-12 00:11:43,080 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@33b98845 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 12.11 12:11:43, skipping insertion in model container [2023-11-12 00:11:43,080 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:11:42" (2/3) ... [2023-11-12 00:11:43,082 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@33b98845 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 12.11 12:11:43, skipping insertion in model container [2023-11-12 00:11:43,082 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 12.11 12:11:43" (3/3) ... [2023-11-12 00:11:43,084 INFO L112 eAbstractionObserver]: Analyzing ICFG s1lif.c [2023-11-12 00:11:43,101 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-11-12 00:11:43,101 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-11-12 00:11:43,147 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-11-12 00:11:43,154 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;@f245b01, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-11-12 00:11:43,154 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-11-12 00:11:43,159 INFO L276 IsEmpty]: Start isEmpty. Operand has 11 states, 9 states have (on average 1.6666666666666667) internal successors, (15), 10 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:11:43,164 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2023-11-12 00:11:43,164 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:11:43,164 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2023-11-12 00:11:43,165 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-12 00:11:43,169 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:11:43,169 INFO L85 PathProgramCache]: Analyzing trace with hash -535561234, now seen corresponding path program 1 times [2023-11-12 00:11:43,178 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:11:43,179 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [456792582] [2023-11-12 00:11:43,179 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:11:43,180 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:11:43,355 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:11:43,612 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-12 00:11:43,613 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:11:43,613 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [456792582] [2023-11-12 00:11:43,614 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [456792582] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-12 00:11:43,615 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-12 00:11:43,615 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-11-12 00:11:43,617 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [249909987] [2023-11-12 00:11:43,618 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-12 00:11:43,622 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-12 00:11:43,623 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:11:43,669 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-12 00:11:43,670 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-12 00:11:43,673 INFO L87 Difference]: Start difference. First operand has 11 states, 9 states have (on average 1.6666666666666667) internal successors, (15), 10 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 3 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:11:43,751 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:11:43,751 INFO L93 Difference]: Finished difference Result 20 states and 27 transitions. [2023-11-12 00:11:43,752 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-12 00:11:43,754 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 3 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 7 [2023-11-12 00:11:43,754 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:11:43,762 INFO L225 Difference]: With dead ends: 20 [2023-11-12 00:11:43,763 INFO L226 Difference]: Without dead ends: 9 [2023-11-12 00:11:43,766 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-12 00:11:43,772 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 0 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 18 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 9 SdHoareTripleChecker+Invalid, 18 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 18 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-12 00:11:43,773 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 9 Invalid, 18 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 18 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-12 00:11:43,793 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9 states. [2023-11-12 00:11:43,810 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9 to 9. [2023-11-12 00:11:43,812 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 9 states, 8 states have (on average 1.375) internal successors, (11), 8 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:11:43,813 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9 states to 9 states and 11 transitions. [2023-11-12 00:11:43,815 INFO L78 Accepts]: Start accepts. Automaton has 9 states and 11 transitions. Word has length 7 [2023-11-12 00:11:43,815 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:11:43,816 INFO L495 AbstractCegarLoop]: Abstraction has 9 states and 11 transitions. [2023-11-12 00:11:43,817 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 3 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:11:43,818 INFO L276 IsEmpty]: Start isEmpty. Operand 9 states and 11 transitions. [2023-11-12 00:11:43,818 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2023-11-12 00:11:43,819 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:11:43,819 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2023-11-12 00:11:43,819 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-11-12 00:11:43,820 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-12 00:11:43,821 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:11:43,822 INFO L85 PathProgramCache]: Analyzing trace with hash 344823405, now seen corresponding path program 1 times [2023-11-12 00:11:43,822 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:11:43,822 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1654646662] [2023-11-12 00:11:43,823 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:11:43,823 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:11:43,878 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:11:44,036 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-12 00:11:44,037 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:11:44,037 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1654646662] [2023-11-12 00:11:44,038 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1654646662] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-12 00:11:44,038 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-12 00:11:44,038 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-11-12 00:11:44,039 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1686218425] [2023-11-12 00:11:44,040 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-12 00:11:44,041 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-11-12 00:11:44,042 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:11:44,042 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-11-12 00:11:44,043 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2023-11-12 00:11:44,048 INFO L87 Difference]: Start difference. First operand 9 states and 11 transitions. Second operand has 4 states, 4 states have (on average 2.0) internal successors, (8), 4 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:11:44,095 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:11:44,095 INFO L93 Difference]: Finished difference Result 15 states and 19 transitions. [2023-11-12 00:11:44,096 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-11-12 00:11:44,096 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.0) internal successors, (8), 4 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 8 [2023-11-12 00:11:44,097 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:11:44,097 INFO L225 Difference]: With dead ends: 15 [2023-11-12 00:11:44,097 INFO L226 Difference]: Without dead ends: 11 [2023-11-12 00:11:44,103 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2023-11-12 00:11:44,108 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 7 mSDsluCounter, 2 mSDsCounter, 0 mSdLazyCounter, 14 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 4 SdHoareTripleChecker+Invalid, 17 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 14 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-12 00:11:44,109 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [7 Valid, 4 Invalid, 17 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 14 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-12 00:11:44,111 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 11 states. [2023-11-12 00:11:44,113 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 11 to 11. [2023-11-12 00:11:44,114 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 11 states, 10 states have (on average 1.3) internal successors, (13), 10 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:11:44,115 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11 states to 11 states and 13 transitions. [2023-11-12 00:11:44,115 INFO L78 Accepts]: Start accepts. Automaton has 11 states and 13 transitions. Word has length 8 [2023-11-12 00:11:44,115 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:11:44,115 INFO L495 AbstractCegarLoop]: Abstraction has 11 states and 13 transitions. [2023-11-12 00:11:44,115 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 2.0) internal successors, (8), 4 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:11:44,116 INFO L276 IsEmpty]: Start isEmpty. Operand 11 states and 13 transitions. [2023-11-12 00:11:44,116 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2023-11-12 00:11:44,116 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:11:44,117 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-12 00:11:44,117 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2023-11-12 00:11:44,117 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-12 00:11:44,118 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:11:44,118 INFO L85 PathProgramCache]: Analyzing trace with hash 750922709, now seen corresponding path program 1 times [2023-11-12 00:11:44,118 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:11:44,119 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1855516801] [2023-11-12 00:11:44,119 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:11:44,119 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:11:44,213 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:11:45,110 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-12 00:11:45,110 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:11:45,111 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1855516801] [2023-11-12 00:11:45,111 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1855516801] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-12 00:11:45,111 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1638428463] [2023-11-12 00:11:45,111 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:11:45,111 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:11:45,112 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e3ac585f-7e94-404d-aa2b-e34cc2092d0e/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 00:11:45,115 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e3ac585f-7e94-404d-aa2b-e34cc2092d0e/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-12 00:11:45,143 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e3ac585f-7e94-404d-aa2b-e34cc2092d0e/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-11-12 00:11:45,216 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:11:45,219 INFO L262 TraceCheckSpWp]: Trace formula consists of 109 conjuncts, 35 conjunts are in the unsatisfiable core [2023-11-12 00:11:45,227 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-12 00:11:45,299 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 1, 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 10 treesize of output 8 [2023-11-12 00:11:45,321 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2023-11-12 00:11:45,359 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 18 [2023-11-12 00:11:45,462 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 21 [2023-11-12 00:11:45,577 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 21 [2023-11-12 00:11:45,682 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-12 00:11:45,682 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-12 00:11:45,861 WARN L854 $PredicateComparison]: unable to prove that (let ((.cse0 (select |c_#memory_int| |c_ULTIMATE.start_main_~a~0#1.base|)) (.cse1 (+ (* |c_ULTIMATE.start_main_~i~0#1| 4) |c_ULTIMATE.start_main_~a~0#1.offset|)) (.cse2 (* c_~N~0 2))) (and (or (= (select .cse0 .cse1) 1) (forall ((v_DerPreprocessor_1 (Array Int Int))) (= .cse2 (+ (select v_DerPreprocessor_1 |c_ULTIMATE.start_main_~a~0#1.offset|) (select (select (store |c_#memory_int| |c_ULTIMATE.start_main_~a~0#1.base| v_DerPreprocessor_1) |c_ULTIMATE.start_main_~#sum~0#1.base|) |c_ULTIMATE.start_main_~#sum~0#1.offset|))))) (= (let ((.cse3 (store .cse0 .cse1 2))) (+ (select .cse3 |c_ULTIMATE.start_main_~a~0#1.offset|) (select (select (store |c_#memory_int| |c_ULTIMATE.start_main_~a~0#1.base| .cse3) |c_ULTIMATE.start_main_~#sum~0#1.base|) |c_ULTIMATE.start_main_~#sum~0#1.offset|))) .cse2))) is different from false [2023-11-12 00:11:46,046 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 1 not checked. [2023-11-12 00:11:46,046 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1638428463] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-12 00:11:46,047 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [46310562] [2023-11-12 00:11:46,070 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2023-11-12 00:11:46,070 INFO L166 IcfgInterpreter]: Building call graph [2023-11-12 00:11:46,077 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-12 00:11:46,085 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-12 00:11:46,086 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-12 00:11:46,653 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-12 00:11:47,067 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '171#(and (not (= (* 2 ~N~0) |ULTIMATE.start_main_#t~mem14#1|)) (= (select (select |#memory_int| |ULTIMATE.start_main_~#sum~0#1.base|) |ULTIMATE.start_main_~#sum~0#1.offset|) |ULTIMATE.start_main_#t~mem14#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0) (<= ~N~0 |ULTIMATE.start_main_~i~0#1|))' at error location [2023-11-12 00:11:47,067 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-12 00:11:47,068 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-12 00:11:47,068 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 18 [2023-11-12 00:11:47,068 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1266729400] [2023-11-12 00:11:47,068 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-12 00:11:47,069 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 18 states [2023-11-12 00:11:47,069 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:11:47,070 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 18 interpolants. [2023-11-12 00:11:47,071 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=391, Unknown=1, NotChecked=40, Total=506 [2023-11-12 00:11:47,071 INFO L87 Difference]: Start difference. First operand 11 states and 13 transitions. Second operand has 18 states, 18 states have (on average 1.1666666666666667) internal successors, (21), 18 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:11:47,354 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:11:47,354 INFO L93 Difference]: Finished difference Result 21 states and 26 transitions. [2023-11-12 00:11:47,355 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2023-11-12 00:11:47,355 INFO L78 Accepts]: Start accepts. Automaton has has 18 states, 18 states have (on average 1.1666666666666667) internal successors, (21), 18 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 10 [2023-11-12 00:11:47,355 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:11:47,357 INFO L225 Difference]: With dead ends: 21 [2023-11-12 00:11:47,357 INFO L226 Difference]: Without dead ends: 18 [2023-11-12 00:11:47,358 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 14 SyntacticMatches, 3 SemanticMatches, 23 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 140 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=87, Invalid=468, Unknown=1, NotChecked=44, Total=600 [2023-11-12 00:11:47,359 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 1 mSDsluCounter, 19 mSDsCounter, 0 mSdLazyCounter, 110 mSolverCounterSat, 4 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 21 SdHoareTripleChecker+Invalid, 135 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 110 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 19 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-12 00:11:47,359 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1 Valid, 21 Invalid, 135 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 110 Invalid, 2 Unknown, 19 Unchecked, 0.2s Time] [2023-11-12 00:11:47,360 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2023-11-12 00:11:47,368 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 15. [2023-11-12 00:11:47,368 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 15 states, 14 states have (on average 1.3571428571428572) internal successors, (19), 14 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:11:47,369 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 19 transitions. [2023-11-12 00:11:47,369 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 19 transitions. Word has length 10 [2023-11-12 00:11:47,369 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:11:47,373 INFO L495 AbstractCegarLoop]: Abstraction has 15 states and 19 transitions. [2023-11-12 00:11:47,373 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 18 states, 18 states have (on average 1.1666666666666667) internal successors, (21), 18 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:11:47,373 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 19 transitions. [2023-11-12 00:11:47,374 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2023-11-12 00:11:47,374 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:11:47,374 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-12 00:11:47,385 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e3ac585f-7e94-404d-aa2b-e34cc2092d0e/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-11-12 00:11:47,579 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e3ac585f-7e94-404d-aa2b-e34cc2092d0e/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:11:47,580 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-12 00:11:47,580 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:11:47,580 INFO L85 PathProgramCache]: Analyzing trace with hash 1803519565, now seen corresponding path program 2 times [2023-11-12 00:11:47,581 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:11:47,581 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1944110330] [2023-11-12 00:11:47,581 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:11:47,581 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:11:47,597 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:11:47,667 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-12 00:11:47,667 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:11:47,667 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1944110330] [2023-11-12 00:11:47,668 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1944110330] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-12 00:11:47,668 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1828329045] [2023-11-12 00:11:47,668 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-12 00:11:47,668 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:11:47,668 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e3ac585f-7e94-404d-aa2b-e34cc2092d0e/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 00:11:47,670 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e3ac585f-7e94-404d-aa2b-e34cc2092d0e/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-12 00:11:47,696 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e3ac585f-7e94-404d-aa2b-e34cc2092d0e/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-11-12 00:11:47,760 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2023-11-12 00:11:47,761 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-12 00:11:47,762 INFO L262 TraceCheckSpWp]: Trace formula consists of 116 conjuncts, 6 conjunts are in the unsatisfiable core [2023-11-12 00:11:47,764 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-12 00:11:47,813 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 3 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-12 00:11:47,813 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-12 00:11:47,862 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 3 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-12 00:11:47,862 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1828329045] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-12 00:11:47,863 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [396962449] [2023-11-12 00:11:47,865 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2023-11-12 00:11:47,865 INFO L166 IcfgInterpreter]: Building call graph [2023-11-12 00:11:47,866 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-12 00:11:47,866 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-12 00:11:47,866 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-12 00:11:48,561 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-12 00:11:48,923 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '311#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (not (= (* 2 ~N~0) |ULTIMATE.start_main_#t~mem14#1|)) (= |ULTIMATE.start_main_~#sum~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#sum~0#1.base|) 0) |ULTIMATE.start_main_#t~mem14#1|) (<= ~N~0 |ULTIMATE.start_main_~i~0#1|))' at error location [2023-11-12 00:11:48,923 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-12 00:11:48,924 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-12 00:11:48,924 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 11 [2023-11-12 00:11:48,924 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1717024217] [2023-11-12 00:11:48,924 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-12 00:11:48,925 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2023-11-12 00:11:48,925 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:11:48,925 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2023-11-12 00:11:48,926 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=187, Unknown=0, NotChecked=0, Total=240 [2023-11-12 00:11:48,926 INFO L87 Difference]: Start difference. First operand 15 states and 19 transitions. Second operand has 11 states, 11 states have (on average 1.6363636363636365) internal successors, (18), 11 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:11:49,046 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:11:49,046 INFO L93 Difference]: Finished difference Result 32 states and 38 transitions. [2023-11-12 00:11:49,047 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2023-11-12 00:11:49,047 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 1.6363636363636365) internal successors, (18), 11 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 11 [2023-11-12 00:11:49,047 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:11:49,048 INFO L225 Difference]: With dead ends: 32 [2023-11-12 00:11:49,048 INFO L226 Difference]: Without dead ends: 22 [2023-11-12 00:11:49,049 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 18 SyntacticMatches, 6 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 117 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=68, Invalid=238, Unknown=0, NotChecked=0, Total=306 [2023-11-12 00:11:49,050 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 24 mSDsluCounter, 8 mSDsCounter, 0 mSdLazyCounter, 41 mSolverCounterSat, 22 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 24 SdHoareTripleChecker+Valid, 10 SdHoareTripleChecker+Invalid, 63 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 22 IncrementalHoareTripleChecker+Valid, 41 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-12 00:11:49,050 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [24 Valid, 10 Invalid, 63 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [22 Valid, 41 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-12 00:11:49,051 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2023-11-12 00:11:49,058 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 15. [2023-11-12 00:11:49,059 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 15 states, 14 states have (on average 1.2857142857142858) internal successors, (18), 14 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:11:49,059 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 18 transitions. [2023-11-12 00:11:49,059 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 18 transitions. Word has length 11 [2023-11-12 00:11:49,060 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:11:49,060 INFO L495 AbstractCegarLoop]: Abstraction has 15 states and 18 transitions. [2023-11-12 00:11:49,060 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 11 states have (on average 1.6363636363636365) internal successors, (18), 11 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:11:49,060 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 18 transitions. [2023-11-12 00:11:49,061 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2023-11-12 00:11:49,061 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:11:49,061 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-12 00:11:49,072 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e3ac585f-7e94-404d-aa2b-e34cc2092d0e/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2023-11-12 00:11:49,267 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e3ac585f-7e94-404d-aa2b-e34cc2092d0e/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:11:49,268 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-12 00:11:49,268 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:11:49,268 INFO L85 PathProgramCache]: Analyzing trace with hash -1075573514, now seen corresponding path program 3 times [2023-11-12 00:11:49,268 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:11:49,269 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1931303475] [2023-11-12 00:11:49,269 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:11:49,269 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:11:49,294 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:11:49,396 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-12 00:11:49,396 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:11:49,398 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1931303475] [2023-11-12 00:11:49,402 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1931303475] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-12 00:11:49,403 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1980752021] [2023-11-12 00:11:49,403 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-11-12 00:11:49,403 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:11:49,403 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e3ac585f-7e94-404d-aa2b-e34cc2092d0e/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 00:11:49,405 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e3ac585f-7e94-404d-aa2b-e34cc2092d0e/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-12 00:11:49,427 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e3ac585f-7e94-404d-aa2b-e34cc2092d0e/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-11-12 00:11:49,488 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-11-12 00:11:49,488 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-12 00:11:49,490 INFO L262 TraceCheckSpWp]: Trace formula consists of 116 conjuncts, 6 conjunts are in the unsatisfiable core [2023-11-12 00:11:49,493 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-12 00:11:49,554 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-12 00:11:49,555 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-12 00:11:49,599 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 1 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-12 00:11:49,600 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1980752021] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-12 00:11:49,600 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [945986881] [2023-11-12 00:11:49,603 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2023-11-12 00:11:49,603 INFO L166 IcfgInterpreter]: Building call graph [2023-11-12 00:11:49,604 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-12 00:11:49,604 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-12 00:11:49,604 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-12 00:11:49,933 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-12 00:11:50,179 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '466#(and (not (= (* 2 ~N~0) |ULTIMATE.start_main_#t~mem14#1|)) (= (select (select |#memory_int| |ULTIMATE.start_main_~#sum~0#1.base|) |ULTIMATE.start_main_~#sum~0#1.offset|) |ULTIMATE.start_main_#t~mem14#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0) (<= ~N~0 |ULTIMATE.start_main_~i~0#1|))' at error location [2023-11-12 00:11:50,179 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-12 00:11:50,179 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-12 00:11:50,180 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 11 [2023-11-12 00:11:50,180 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [853775747] [2023-11-12 00:11:50,180 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-12 00:11:50,180 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2023-11-12 00:11:50,181 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:11:50,181 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2023-11-12 00:11:50,181 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=163, Unknown=0, NotChecked=0, Total=210 [2023-11-12 00:11:50,182 INFO L87 Difference]: Start difference. First operand 15 states and 18 transitions. Second operand has 11 states, 11 states have (on average 1.6363636363636365) internal successors, (18), 11 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:11:50,313 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:11:50,314 INFO L93 Difference]: Finished difference Result 19 states and 22 transitions. [2023-11-12 00:11:50,314 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-11-12 00:11:50,314 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 1.6363636363636365) internal successors, (18), 11 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 11 [2023-11-12 00:11:50,315 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:11:50,315 INFO L225 Difference]: With dead ends: 19 [2023-11-12 00:11:50,315 INFO L226 Difference]: Without dead ends: 14 [2023-11-12 00:11:50,316 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 19 SyntacticMatches, 6 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 91 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=66, Invalid=240, Unknown=0, NotChecked=0, Total=306 [2023-11-12 00:11:50,317 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 14 mSDsluCounter, 8 mSDsCounter, 0 mSdLazyCounter, 53 mSolverCounterSat, 18 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 10 SdHoareTripleChecker+Invalid, 71 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 18 IncrementalHoareTripleChecker+Valid, 53 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-12 00:11:50,317 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [14 Valid, 10 Invalid, 71 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [18 Valid, 53 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-12 00:11:50,318 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2023-11-12 00:11:50,326 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 14. [2023-11-12 00:11:50,326 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 14 states, 13 states have (on average 1.2307692307692308) internal successors, (16), 13 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:11:50,328 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 16 transitions. [2023-11-12 00:11:50,328 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 16 transitions. Word has length 11 [2023-11-12 00:11:50,329 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:11:50,329 INFO L495 AbstractCegarLoop]: Abstraction has 14 states and 16 transitions. [2023-11-12 00:11:50,329 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 11 states have (on average 1.6363636363636365) internal successors, (18), 11 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:11:50,330 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 16 transitions. [2023-11-12 00:11:50,330 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2023-11-12 00:11:50,330 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:11:50,331 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2023-11-12 00:11:50,343 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e3ac585f-7e94-404d-aa2b-e34cc2092d0e/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2023-11-12 00:11:50,538 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e3ac585f-7e94-404d-aa2b-e34cc2092d0e/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:11:50,538 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-12 00:11:50,539 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:11:50,539 INFO L85 PathProgramCache]: Analyzing trace with hash 135501902, now seen corresponding path program 4 times [2023-11-12 00:11:50,539 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:11:50,539 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [37850128] [2023-11-12 00:11:50,539 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:11:50,539 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:11:50,572 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:11:52,112 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-12 00:11:52,112 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:11:52,112 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [37850128] [2023-11-12 00:11:52,113 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [37850128] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-12 00:11:52,113 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [473385200] [2023-11-12 00:11:52,113 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-11-12 00:11:52,113 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:11:52,113 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e3ac585f-7e94-404d-aa2b-e34cc2092d0e/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 00:11:52,116 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e3ac585f-7e94-404d-aa2b-e34cc2092d0e/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-12 00:11:52,142 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e3ac585f-7e94-404d-aa2b-e34cc2092d0e/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-11-12 00:11:52,220 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:11:52,222 INFO L262 TraceCheckSpWp]: Trace formula consists of 133 conjuncts, 49 conjunts are in the unsatisfiable core [2023-11-12 00:11:52,226 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-12 00:11:52,239 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2023-11-12 00:11:52,277 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-12 00:11:52,278 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 18 [2023-11-12 00:11:52,335 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-12 00:11:52,336 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 28 [2023-11-12 00:11:52,496 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-12 00:11:52,497 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 33 treesize of output 31 [2023-11-12 00:11:52,568 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-12 00:11:52,570 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 33 treesize of output 31 [2023-11-12 00:11:52,707 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-12 00:11:52,708 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 33 treesize of output 31 [2023-11-12 00:11:52,783 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-12 00:11:52,784 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 3 select indices, 3 select index equivalence classes, 2 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 33 treesize of output 31 [2023-11-12 00:11:52,875 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-12 00:11:52,875 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-12 00:11:55,356 WARN L854 $PredicateComparison]: unable to prove that (let ((.cse8 (select |c_#memory_int| |c_ULTIMATE.start_main_~a~0#1.base|)) (.cse9 (+ (* |c_ULTIMATE.start_main_~i~0#1| 4) |c_ULTIMATE.start_main_~a~0#1.offset|))) (let ((.cse0 (= (select .cse8 .cse9) 1)) (.cse1 (* c_~N~0 2)) (.cse6 (+ |c_ULTIMATE.start_main_~a~0#1.offset| 4))) (and (or (not .cse0) (= .cse1 (let ((.cse7 (store .cse8 .cse9 2))) (let ((.cse3 (store |c_#memory_int| |c_ULTIMATE.start_main_~a~0#1.base| .cse7))) (let ((.cse4 (select .cse3 |c_ULTIMATE.start_main_~#sum~0#1.base|))) (let ((.cse2 (select .cse7 |c_ULTIMATE.start_main_~a~0#1.offset|)) (.cse5 (select .cse4 |c_ULTIMATE.start_main_~#sum~0#1.offset|))) (+ .cse2 (select (select (store .cse3 |c_ULTIMATE.start_main_~#sum~0#1.base| (store .cse4 |c_ULTIMATE.start_main_~#sum~0#1.offset| (+ .cse2 .cse5))) |c_ULTIMATE.start_main_~a~0#1.base|) .cse6) .cse5))))))) (or .cse0 (forall ((v_DerPreprocessor_2 (Array Int Int))) (= .cse1 (let ((.cse11 (store |c_#memory_int| |c_ULTIMATE.start_main_~a~0#1.base| v_DerPreprocessor_2))) (let ((.cse12 (select .cse11 |c_ULTIMATE.start_main_~#sum~0#1.base|))) (let ((.cse10 (select v_DerPreprocessor_2 |c_ULTIMATE.start_main_~a~0#1.offset|)) (.cse13 (select .cse12 |c_ULTIMATE.start_main_~#sum~0#1.offset|))) (+ .cse10 (select (select (store .cse11 |c_ULTIMATE.start_main_~#sum~0#1.base| (store .cse12 |c_ULTIMATE.start_main_~#sum~0#1.offset| (+ .cse10 .cse13))) |c_ULTIMATE.start_main_~a~0#1.base|) .cse6) .cse13)))))))))) is different from false [2023-11-12 00:11:55,525 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 1, 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 10 treesize of output 3 [2023-11-12 00:11:55,671 INFO L322 Elim1Store]: treesize reduction 12, result has 74.5 percent of original size [2023-11-12 00:11:55,672 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 181 treesize of output 140 [2023-11-12 00:12:13,345 WARN L854 $PredicateComparison]: unable to prove that (or (let ((.cse6 (select |c_#memory_int| |c_ULTIMATE.start_main_~a~0#1.base|)) (.cse7 (* c_~N~0 2)) (.cse5 (+ |c_ULTIMATE.start_main_~a~0#1.offset| 4))) (let ((.cse1 (forall ((v_DerPreprocessor_2 (Array Int Int))) (= .cse7 (let ((.cse24 (store |c_#memory_int| |c_ULTIMATE.start_main_~a~0#1.base| v_DerPreprocessor_2))) (let ((.cse25 (select .cse24 |c_ULTIMATE.start_main_~#sum~0#1.base|))) (let ((.cse23 (select v_DerPreprocessor_2 |c_ULTIMATE.start_main_~a~0#1.offset|)) (.cse26 (select .cse25 |c_ULTIMATE.start_main_~#sum~0#1.offset|))) (+ .cse23 (select (select (store .cse24 |c_ULTIMATE.start_main_~#sum~0#1.base| (store .cse25 |c_ULTIMATE.start_main_~#sum~0#1.offset| (+ .cse23 .cse26))) |c_ULTIMATE.start_main_~a~0#1.base|) .cse5) .cse26))))))) (.cse8 (= (select .cse6 |c_ULTIMATE.start_main_~a~0#1.offset|) 1))) (and (or (let ((.cse0 (= (select .cse6 .cse5) 1))) (and (or .cse0 .cse1) (or (not .cse0) (= (let ((.cse3 (store |c_#memory_int| |c_ULTIMATE.start_main_~a~0#1.base| (store (store .cse6 |c_ULTIMATE.start_main_~a~0#1.offset| 2) .cse5 2)))) (let ((.cse4 (select .cse3 |c_ULTIMATE.start_main_~#sum~0#1.base|))) (let ((.cse2 (select .cse4 |c_ULTIMATE.start_main_~#sum~0#1.offset|))) (+ .cse2 (select (select (store .cse3 |c_ULTIMATE.start_main_~#sum~0#1.base| (store .cse4 |c_ULTIMATE.start_main_~#sum~0#1.offset| (+ .cse2 2))) |c_ULTIMATE.start_main_~a~0#1.base|) .cse5) 2)))) .cse7)))) (not .cse8)) (or (and (forall ((v_arrayElimArr_1 (Array Int Int))) (or (= .cse7 (let ((.cse11 (store |c_#memory_int| |c_ULTIMATE.start_main_~a~0#1.base| v_arrayElimArr_1))) (let ((.cse12 (select .cse11 |c_ULTIMATE.start_main_~#sum~0#1.base|))) (let ((.cse9 (select v_arrayElimArr_1 |c_ULTIMATE.start_main_~a~0#1.offset|)) (.cse10 (select .cse12 |c_ULTIMATE.start_main_~#sum~0#1.offset|))) (+ .cse9 .cse10 (select (select (store .cse11 |c_ULTIMATE.start_main_~#sum~0#1.base| (store .cse12 |c_ULTIMATE.start_main_~#sum~0#1.offset| (+ .cse9 .cse10))) |c_ULTIMATE.start_main_~a~0#1.base|) .cse5)))))) (not (= (select v_arrayElimArr_1 .cse5) 2)))) (forall ((v_arrayElimArr_1 (Array Int Int))) (let ((.cse14 (store |c_#memory_int| |c_ULTIMATE.start_main_~a~0#1.base| v_arrayElimArr_1))) (let ((.cse15 (select .cse14 |c_ULTIMATE.start_main_~#sum~0#1.base|))) (let ((.cse13 (select .cse15 |c_ULTIMATE.start_main_~#sum~0#1.offset|))) (or (= .cse7 (+ .cse13 2 (select (select (store .cse14 |c_ULTIMATE.start_main_~#sum~0#1.base| (store .cse15 |c_ULTIMATE.start_main_~#sum~0#1.offset| (+ .cse13 2))) |c_ULTIMATE.start_main_~a~0#1.base|) .cse5))) (= .cse7 (let ((.cse16 (select v_arrayElimArr_1 |c_ULTIMATE.start_main_~a~0#1.offset|))) (+ .cse16 .cse13 (select (select (store .cse14 |c_ULTIMATE.start_main_~#sum~0#1.base| (store .cse15 |c_ULTIMATE.start_main_~#sum~0#1.offset| (+ .cse16 .cse13))) |c_ULTIMATE.start_main_~a~0#1.base|) .cse5)))) (not (= (select v_arrayElimArr_1 .cse5) 2))))))) (forall ((v_arrayElimArr_1 (Array Int Int))) (let ((.cse18 (store |c_#memory_int| |c_ULTIMATE.start_main_~a~0#1.base| v_arrayElimArr_1))) (let ((.cse19 (select .cse18 |c_ULTIMATE.start_main_~#sum~0#1.base|))) (let ((.cse17 (select .cse19 |c_ULTIMATE.start_main_~#sum~0#1.offset|))) (or (= .cse7 (+ .cse17 (select (select (store .cse18 |c_ULTIMATE.start_main_~#sum~0#1.base| (store .cse19 |c_ULTIMATE.start_main_~#sum~0#1.offset| (+ .cse17 1))) |c_ULTIMATE.start_main_~a~0#1.base|) .cse5) 1)) (= .cse7 (+ .cse17 2 (select (select (store .cse18 |c_ULTIMATE.start_main_~#sum~0#1.base| (store .cse19 |c_ULTIMATE.start_main_~#sum~0#1.offset| (+ .cse17 2))) |c_ULTIMATE.start_main_~a~0#1.base|) .cse5))) (not (= (select v_arrayElimArr_1 |c_ULTIMATE.start_main_~a~0#1.offset|) 1)) (not (= (select v_arrayElimArr_1 .cse5) 2))))))) (forall ((v_arrayElimArr_1 (Array Int Int))) (or (= .cse7 (let ((.cse21 (store |c_#memory_int| |c_ULTIMATE.start_main_~a~0#1.base| v_arrayElimArr_1))) (let ((.cse22 (select .cse21 |c_ULTIMATE.start_main_~#sum~0#1.base|))) (let ((.cse20 (select .cse22 |c_ULTIMATE.start_main_~#sum~0#1.offset|))) (+ .cse20 (select (select (store .cse21 |c_ULTIMATE.start_main_~#sum~0#1.base| (store .cse22 |c_ULTIMATE.start_main_~#sum~0#1.offset| (+ .cse20 1))) |c_ULTIMATE.start_main_~a~0#1.base|) .cse5) 1))))) (not (= (select v_arrayElimArr_1 |c_ULTIMATE.start_main_~a~0#1.offset|) 1)) (not (= (select v_arrayElimArr_1 .cse5) 2)))) .cse1) .cse8)))) (< |c_ULTIMATE.start_main_~i~0#1| c_~N~0)) is different from false [2023-11-12 00:12:16,604 WARN L854 $PredicateComparison]: unable to prove that (let ((.cse6 (* 2 |c_ULTIMATE.start_main_~i~0#1|))) (let ((.cse24 (store (select |c_#memory_int| |c_ULTIMATE.start_main_~a~0#1.base|) (+ (* |c_ULTIMATE.start_main_~i~0#1| 4) |c_ULTIMATE.start_main_~a~0#1.offset|) 1)) (.cse11 (+ .cse6 2)) (.cse5 (+ |c_ULTIMATE.start_main_~a~0#1.offset| 4))) (let ((.cse0 (forall ((v_DerPreprocessor_2 (Array Int Int))) (= .cse11 (let ((.cse26 (store |c_#memory_int| |c_ULTIMATE.start_main_~a~0#1.base| v_DerPreprocessor_2))) (let ((.cse27 (select .cse26 |c_ULTIMATE.start_main_~#sum~0#1.base|))) (let ((.cse25 (select v_DerPreprocessor_2 |c_ULTIMATE.start_main_~a~0#1.offset|)) (.cse28 (select .cse27 |c_ULTIMATE.start_main_~#sum~0#1.offset|))) (+ .cse25 (select (select (store .cse26 |c_ULTIMATE.start_main_~#sum~0#1.base| (store .cse27 |c_ULTIMATE.start_main_~#sum~0#1.offset| (+ .cse25 .cse28))) |c_ULTIMATE.start_main_~a~0#1.base|) .cse5) .cse28))))))) (.cse19 (= (select .cse24 |c_ULTIMATE.start_main_~a~0#1.offset|) 1))) (and (or (let ((.cse1 (+ .cse6 1))) (and .cse0 (forall ((v_arrayElimArr_1 (Array Int Int))) (let ((.cse3 (store |c_#memory_int| |c_ULTIMATE.start_main_~a~0#1.base| v_arrayElimArr_1))) (let ((.cse4 (select .cse3 |c_ULTIMATE.start_main_~#sum~0#1.base|))) (let ((.cse2 (select .cse4 |c_ULTIMATE.start_main_~#sum~0#1.offset|))) (or (= .cse1 (+ .cse2 (select (select (store .cse3 |c_ULTIMATE.start_main_~#sum~0#1.base| (store .cse4 |c_ULTIMATE.start_main_~#sum~0#1.offset| (+ .cse2 1))) |c_ULTIMATE.start_main_~a~0#1.base|) .cse5))) (not (= (select v_arrayElimArr_1 |c_ULTIMATE.start_main_~a~0#1.offset|) 1)) (= .cse6 (+ .cse2 (select (select (store .cse3 |c_ULTIMATE.start_main_~#sum~0#1.base| (store .cse4 |c_ULTIMATE.start_main_~#sum~0#1.offset| (+ .cse2 2))) |c_ULTIMATE.start_main_~a~0#1.base|) .cse5))) (not (= (select v_arrayElimArr_1 .cse5) 2))))))) (forall ((v_arrayElimArr_1 (Array Int Int))) (or (= (let ((.cse9 (store |c_#memory_int| |c_ULTIMATE.start_main_~a~0#1.base| v_arrayElimArr_1))) (let ((.cse10 (select .cse9 |c_ULTIMATE.start_main_~#sum~0#1.base|))) (let ((.cse7 (select v_arrayElimArr_1 |c_ULTIMATE.start_main_~a~0#1.offset|)) (.cse8 (select .cse10 |c_ULTIMATE.start_main_~#sum~0#1.offset|))) (+ .cse7 .cse8 (select (select (store .cse9 |c_ULTIMATE.start_main_~#sum~0#1.base| (store .cse10 |c_ULTIMATE.start_main_~#sum~0#1.offset| (+ .cse7 .cse8))) |c_ULTIMATE.start_main_~a~0#1.base|) .cse5))))) .cse11) (not (= (select v_arrayElimArr_1 .cse5) 2)))) (forall ((v_arrayElimArr_1 (Array Int Int))) (let ((.cse14 (store |c_#memory_int| |c_ULTIMATE.start_main_~a~0#1.base| v_arrayElimArr_1))) (let ((.cse15 (select .cse14 |c_ULTIMATE.start_main_~#sum~0#1.base|))) (let ((.cse13 (select .cse15 |c_ULTIMATE.start_main_~#sum~0#1.offset|))) (or (= (let ((.cse12 (select v_arrayElimArr_1 |c_ULTIMATE.start_main_~a~0#1.offset|))) (+ .cse12 .cse13 (select (select (store .cse14 |c_ULTIMATE.start_main_~#sum~0#1.base| (store .cse15 |c_ULTIMATE.start_main_~#sum~0#1.offset| (+ .cse12 .cse13))) |c_ULTIMATE.start_main_~a~0#1.base|) .cse5))) .cse11) (= .cse6 (+ .cse13 (select (select (store .cse14 |c_ULTIMATE.start_main_~#sum~0#1.base| (store .cse15 |c_ULTIMATE.start_main_~#sum~0#1.offset| (+ .cse13 2))) |c_ULTIMATE.start_main_~a~0#1.base|) .cse5))) (not (= (select v_arrayElimArr_1 .cse5) 2))))))) (forall ((v_arrayElimArr_1 (Array Int Int))) (or (= .cse1 (let ((.cse17 (store |c_#memory_int| |c_ULTIMATE.start_main_~a~0#1.base| v_arrayElimArr_1))) (let ((.cse18 (select .cse17 |c_ULTIMATE.start_main_~#sum~0#1.base|))) (let ((.cse16 (select .cse18 |c_ULTIMATE.start_main_~#sum~0#1.offset|))) (+ .cse16 (select (select (store .cse17 |c_ULTIMATE.start_main_~#sum~0#1.base| (store .cse18 |c_ULTIMATE.start_main_~#sum~0#1.offset| (+ .cse16 1))) |c_ULTIMATE.start_main_~a~0#1.base|) .cse5)))))) (not (= (select v_arrayElimArr_1 |c_ULTIMATE.start_main_~a~0#1.offset|) 1)) (not (= (select v_arrayElimArr_1 .cse5) 2)))))) .cse19) (or (let ((.cse20 (= (select .cse24 .cse5) 1))) (and (or .cse0 .cse20) (or (not .cse20) (= .cse6 (let ((.cse21 (store |c_#memory_int| |c_ULTIMATE.start_main_~a~0#1.base| (store (store .cse24 |c_ULTIMATE.start_main_~a~0#1.offset| 2) .cse5 2)))) (let ((.cse22 (select .cse21 |c_ULTIMATE.start_main_~#sum~0#1.base|))) (let ((.cse23 (select .cse22 |c_ULTIMATE.start_main_~#sum~0#1.offset|))) (+ (select (select (store .cse21 |c_ULTIMATE.start_main_~#sum~0#1.base| (store .cse22 |c_ULTIMATE.start_main_~#sum~0#1.offset| (+ 2 .cse23))) |c_ULTIMATE.start_main_~a~0#1.base|) .cse5) .cse23)))))))) (not .cse19)))))) is different from false [2023-11-12 00:12:19,333 WARN L854 $PredicateComparison]: unable to prove that (let ((.cse25 (* 2 |c_ULTIMATE.start_main_~i~0#1|))) (let ((.cse5 (let ((.cse30 (* |c_ULTIMATE.start_main_~i~0#1| 4))) (store (store (select |c_#memory_int| |c_ULTIMATE.start_main_~a~0#1.base|) (+ .cse30 |c_ULTIMATE.start_main_~a~0#1.offset|) 1) (+ .cse30 |c_ULTIMATE.start_main_~a~0#1.offset| 4) 1))) (.cse16 (+ .cse25 4)) (.cse4 (+ |c_ULTIMATE.start_main_~a~0#1.offset| 4))) (let ((.cse7 (forall ((v_DerPreprocessor_2 (Array Int Int))) (= .cse16 (let ((.cse27 (store |c_#memory_int| |c_ULTIMATE.start_main_~a~0#1.base| v_DerPreprocessor_2))) (let ((.cse28 (select .cse27 |c_ULTIMATE.start_main_~#sum~0#1.base|))) (let ((.cse26 (select v_DerPreprocessor_2 |c_ULTIMATE.start_main_~a~0#1.offset|)) (.cse29 (select .cse28 |c_ULTIMATE.start_main_~#sum~0#1.offset|))) (+ .cse26 (select (select (store .cse27 |c_ULTIMATE.start_main_~#sum~0#1.base| (store .cse28 |c_ULTIMATE.start_main_~#sum~0#1.offset| (+ .cse26 .cse29))) |c_ULTIMATE.start_main_~a~0#1.base|) .cse4) .cse29))))))) (.cse0 (+ .cse25 2)) (.cse8 (= (select .cse5 |c_ULTIMATE.start_main_~a~0#1.offset|) 1))) (and (or (let ((.cse6 (= (select .cse5 .cse4) 1))) (and (or (= .cse0 (let ((.cse2 (store |c_#memory_int| |c_ULTIMATE.start_main_~a~0#1.base| (store (store .cse5 |c_ULTIMATE.start_main_~a~0#1.offset| 2) .cse4 2)))) (let ((.cse3 (select .cse2 |c_ULTIMATE.start_main_~#sum~0#1.base|))) (let ((.cse1 (select .cse3 |c_ULTIMATE.start_main_~#sum~0#1.offset|))) (+ .cse1 (select (select (store .cse2 |c_ULTIMATE.start_main_~#sum~0#1.base| (store .cse3 |c_ULTIMATE.start_main_~#sum~0#1.offset| (+ .cse1 2))) |c_ULTIMATE.start_main_~a~0#1.base|) .cse4)))))) (not .cse6)) (or .cse6 .cse7))) (not .cse8)) (or (let ((.cse9 (+ .cse25 3))) (and (forall ((v_arrayElimArr_1 (Array Int Int))) (let ((.cse11 (store |c_#memory_int| |c_ULTIMATE.start_main_~a~0#1.base| v_arrayElimArr_1))) (let ((.cse12 (select .cse11 |c_ULTIMATE.start_main_~#sum~0#1.base|))) (let ((.cse10 (select .cse12 |c_ULTIMATE.start_main_~#sum~0#1.offset|))) (or (= .cse9 (+ .cse10 (select (select (store .cse11 |c_ULTIMATE.start_main_~#sum~0#1.base| (store .cse12 |c_ULTIMATE.start_main_~#sum~0#1.offset| (+ .cse10 1))) |c_ULTIMATE.start_main_~a~0#1.base|) .cse4))) (not (= (select v_arrayElimArr_1 |c_ULTIMATE.start_main_~a~0#1.offset|) 1)) (= (+ .cse10 (select (select (store .cse11 |c_ULTIMATE.start_main_~#sum~0#1.base| (store .cse12 |c_ULTIMATE.start_main_~#sum~0#1.offset| (+ .cse10 2))) |c_ULTIMATE.start_main_~a~0#1.base|) .cse4)) .cse0) (not (= (select v_arrayElimArr_1 .cse4) 2))))))) (forall ((v_arrayElimArr_1 (Array Int Int))) (or (= .cse9 (let ((.cse14 (store |c_#memory_int| |c_ULTIMATE.start_main_~a~0#1.base| v_arrayElimArr_1))) (let ((.cse15 (select .cse14 |c_ULTIMATE.start_main_~#sum~0#1.base|))) (let ((.cse13 (select .cse15 |c_ULTIMATE.start_main_~#sum~0#1.offset|))) (+ .cse13 (select (select (store .cse14 |c_ULTIMATE.start_main_~#sum~0#1.base| (store .cse15 |c_ULTIMATE.start_main_~#sum~0#1.offset| (+ .cse13 1))) |c_ULTIMATE.start_main_~a~0#1.base|) .cse4)))))) (not (= (select v_arrayElimArr_1 |c_ULTIMATE.start_main_~a~0#1.offset|) 1)) (not (= (select v_arrayElimArr_1 .cse4) 2)))) (forall ((v_arrayElimArr_1 (Array Int Int))) (or (= .cse16 (let ((.cse19 (store |c_#memory_int| |c_ULTIMATE.start_main_~a~0#1.base| v_arrayElimArr_1))) (let ((.cse20 (select .cse19 |c_ULTIMATE.start_main_~#sum~0#1.base|))) (let ((.cse17 (select v_arrayElimArr_1 |c_ULTIMATE.start_main_~a~0#1.offset|)) (.cse18 (select .cse20 |c_ULTIMATE.start_main_~#sum~0#1.offset|))) (+ .cse17 .cse18 (select (select (store .cse19 |c_ULTIMATE.start_main_~#sum~0#1.base| (store .cse20 |c_ULTIMATE.start_main_~#sum~0#1.offset| (+ .cse17 .cse18))) |c_ULTIMATE.start_main_~a~0#1.base|) .cse4)))))) (not (= (select v_arrayElimArr_1 .cse4) 2)))) .cse7 (forall ((v_arrayElimArr_1 (Array Int Int))) (let ((.cse23 (store |c_#memory_int| |c_ULTIMATE.start_main_~a~0#1.base| v_arrayElimArr_1))) (let ((.cse24 (select .cse23 |c_ULTIMATE.start_main_~#sum~0#1.base|))) (let ((.cse22 (select .cse24 |c_ULTIMATE.start_main_~#sum~0#1.offset|))) (or (= .cse16 (let ((.cse21 (select v_arrayElimArr_1 |c_ULTIMATE.start_main_~a~0#1.offset|))) (+ .cse21 .cse22 (select (select (store .cse23 |c_ULTIMATE.start_main_~#sum~0#1.base| (store .cse24 |c_ULTIMATE.start_main_~#sum~0#1.offset| (+ .cse21 .cse22))) |c_ULTIMATE.start_main_~a~0#1.base|) .cse4)))) (= (+ .cse22 (select (select (store .cse23 |c_ULTIMATE.start_main_~#sum~0#1.base| (store .cse24 |c_ULTIMATE.start_main_~#sum~0#1.offset| (+ .cse22 2))) |c_ULTIMATE.start_main_~a~0#1.base|) .cse4)) .cse0) (not (= (select v_arrayElimArr_1 .cse4) 2))))))))) .cse8))))) is different from false [2023-11-12 00:12:19,576 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 5 not checked. [2023-11-12 00:12:19,577 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [473385200] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-12 00:12:19,577 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [977808797] [2023-11-12 00:12:19,579 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2023-11-12 00:12:19,579 INFO L166 IcfgInterpreter]: Building call graph [2023-11-12 00:12:19,580 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-12 00:12:19,580 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-12 00:12:19,580 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-12 00:12:19,960 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-12 00:12:29,876 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '631#(and (not (= (* 2 ~N~0) |ULTIMATE.start_main_#t~mem14#1|)) (= (select (select |#memory_int| |ULTIMATE.start_main_~#sum~0#1.base|) |ULTIMATE.start_main_~#sum~0#1.offset|) |ULTIMATE.start_main_#t~mem14#1|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0) (<= ~N~0 |ULTIMATE.start_main_~i~0#1|))' at error location [2023-11-12 00:12:29,876 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-12 00:12:29,876 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-12 00:12:29,877 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12] total 30 [2023-11-12 00:12:29,877 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [419342285] [2023-11-12 00:12:29,877 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-12 00:12:29,878 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 30 states [2023-11-12 00:12:29,878 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:12:29,879 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2023-11-12 00:12:29,880 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=118, Invalid=820, Unknown=8, NotChecked=244, Total=1190 [2023-11-12 00:12:29,881 INFO L87 Difference]: Start difference. First operand 14 states and 16 transitions. Second operand has 30 states, 30 states have (on average 1.1) internal successors, (33), 30 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:12:35,782 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:12:35,783 INFO L93 Difference]: Finished difference Result 29 states and 35 transitions. [2023-11-12 00:12:35,783 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2023-11-12 00:12:35,783 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 30 states have (on average 1.1) internal successors, (33), 30 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 13 [2023-11-12 00:12:35,784 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:12:35,784 INFO L225 Difference]: With dead ends: 29 [2023-11-12 00:12:35,784 INFO L226 Difference]: Without dead ends: 25 [2023-11-12 00:12:35,785 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 13 SyntacticMatches, 6 SemanticMatches, 37 ConstructedPredicates, 4 IntricatePredicates, 0 DeprecatedPredicates, 390 ImplicationChecksByTransitivity, 37.4s TimeCoverageRelationStatistics Valid=146, Invalid=1052, Unknown=8, NotChecked=276, Total=1482 [2023-11-12 00:12:35,788 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 2 mSDsluCounter, 38 mSDsCounter, 0 mSdLazyCounter, 235 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 40 SdHoareTripleChecker+Invalid, 347 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 235 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 108 IncrementalHoareTripleChecker+Unchecked, 3.5s IncrementalHoareTripleChecker+Time [2023-11-12 00:12:35,788 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [2 Valid, 40 Invalid, 347 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 235 Invalid, 0 Unknown, 108 Unchecked, 3.5s Time] [2023-11-12 00:12:35,789 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2023-11-12 00:12:35,798 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 16. [2023-11-12 00:12:35,798 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 16 states, 15 states have (on average 1.2666666666666666) internal successors, (19), 15 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:12:35,798 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 19 transitions. [2023-11-12 00:12:35,799 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 19 transitions. Word has length 13 [2023-11-12 00:12:35,799 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:12:35,799 INFO L495 AbstractCegarLoop]: Abstraction has 16 states and 19 transitions. [2023-11-12 00:12:35,800 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 30 states, 30 states have (on average 1.1) internal successors, (33), 30 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:12:35,800 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 19 transitions. [2023-11-12 00:12:35,800 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2023-11-12 00:12:35,800 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:12:35,801 INFO L195 NwaCegarLoop]: trace histogram [3, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2023-11-12 00:12:35,816 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e3ac585f-7e94-404d-aa2b-e34cc2092d0e/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2023-11-12 00:12:36,006 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e3ac585f-7e94-404d-aa2b-e34cc2092d0e/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2023-11-12 00:12:36,006 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-12 00:12:36,007 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:12:36,007 INFO L85 PathProgramCache]: Analyzing trace with hash -94656268, now seen corresponding path program 5 times [2023-11-12 00:12:36,007 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:12:36,007 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1603391585] [2023-11-12 00:12:36,007 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:12:36,007 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:12:36,027 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:12:36,560 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 4 proven. 5 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-11-12 00:12:36,561 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:12:36,561 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1603391585] [2023-11-12 00:12:36,561 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1603391585] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-12 00:12:36,561 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1260314379] [2023-11-12 00:12:36,562 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-12 00:12:36,562 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:12:36,562 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e3ac585f-7e94-404d-aa2b-e34cc2092d0e/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 00:12:36,563 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e3ac585f-7e94-404d-aa2b-e34cc2092d0e/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-12 00:12:36,567 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e3ac585f-7e94-404d-aa2b-e34cc2092d0e/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-11-12 00:12:36,666 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2023-11-12 00:12:36,666 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-12 00:12:36,668 INFO L262 TraceCheckSpWp]: Trace formula consists of 140 conjuncts, 8 conjunts are in the unsatisfiable core [2023-11-12 00:12:36,668 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-12 00:12:37,224 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-11-12 00:12:37,225 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-12 00:12:37,599 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 6 proven. 3 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-11-12 00:12:37,600 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1260314379] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-12 00:12:37,600 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1573199394] [2023-11-12 00:12:37,602 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2023-11-12 00:12:37,602 INFO L166 IcfgInterpreter]: Building call graph [2023-11-12 00:12:37,603 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-12 00:12:37,603 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-12 00:12:37,603 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-12 00:12:37,954 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-12 00:12:39,155 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '815#(and (= |ULTIMATE.start_main_~a~0#1.offset| 0) (not (= (* 2 ~N~0) |ULTIMATE.start_main_#t~mem14#1|)) (= |ULTIMATE.start_main_~#sum~0#1.offset| 0) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0) (= (select (select |#memory_int| |ULTIMATE.start_main_~#sum~0#1.base|) 0) |ULTIMATE.start_main_#t~mem14#1|) (<= ~N~0 |ULTIMATE.start_main_~i~0#1|))' at error location [2023-11-12 00:12:39,156 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-12 00:12:39,156 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-12 00:12:39,156 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 14 [2023-11-12 00:12:39,157 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2051738244] [2023-11-12 00:12:39,157 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-12 00:12:39,157 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2023-11-12 00:12:39,158 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:12:39,158 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2023-11-12 00:12:39,159 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=73, Invalid=269, Unknown=0, NotChecked=0, Total=342 [2023-11-12 00:12:39,159 INFO L87 Difference]: Start difference. First operand 16 states and 19 transitions. Second operand has 14 states, 14 states have (on average 1.5) internal successors, (21), 14 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:12:39,853 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:12:39,853 INFO L93 Difference]: Finished difference Result 33 states and 39 transitions. [2023-11-12 00:12:39,854 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2023-11-12 00:12:39,854 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 1.5) internal successors, (21), 14 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 14 [2023-11-12 00:12:39,855 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:12:39,855 INFO L225 Difference]: With dead ends: 33 [2023-11-12 00:12:39,855 INFO L226 Difference]: Without dead ends: 20 [2023-11-12 00:12:39,856 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 27 SyntacticMatches, 5 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 159 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=100, Invalid=362, Unknown=0, NotChecked=0, Total=462 [2023-11-12 00:12:39,857 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 13 mSDsluCounter, 10 mSDsCounter, 0 mSdLazyCounter, 60 mSolverCounterSat, 34 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 13 SdHoareTripleChecker+Valid, 12 SdHoareTripleChecker+Invalid, 94 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 34 IncrementalHoareTripleChecker+Valid, 60 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-11-12 00:12:39,858 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [13 Valid, 12 Invalid, 94 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [34 Valid, 60 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2023-11-12 00:12:39,859 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2023-11-12 00:12:39,866 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 16. [2023-11-12 00:12:39,866 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 16 states, 15 states have (on average 1.2) internal successors, (18), 15 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:12:39,867 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 18 transitions. [2023-11-12 00:12:39,867 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 18 transitions. Word has length 14 [2023-11-12 00:12:39,867 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:12:39,867 INFO L495 AbstractCegarLoop]: Abstraction has 16 states and 18 transitions. [2023-11-12 00:12:39,868 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 1.5) internal successors, (21), 14 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:12:39,868 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 18 transitions. [2023-11-12 00:12:39,868 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2023-11-12 00:12:39,868 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:12:39,869 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 2, 1, 1, 1, 1, 1, 1, 1] [2023-11-12 00:12:39,880 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e3ac585f-7e94-404d-aa2b-e34cc2092d0e/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2023-11-12 00:12:40,080 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e3ac585f-7e94-404d-aa2b-e34cc2092d0e/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2023-11-12 00:12:40,080 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-12 00:12:40,081 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:12:40,081 INFO L85 PathProgramCache]: Analyzing trace with hash 720245293, now seen corresponding path program 6 times [2023-11-12 00:12:40,081 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:12:40,081 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1733216029] [2023-11-12 00:12:40,081 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:12:40,081 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:12:40,115 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:12:40,702 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 1 proven. 8 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-11-12 00:12:40,702 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:12:40,703 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1733216029] [2023-11-12 00:12:40,703 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1733216029] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-12 00:12:40,703 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1783551444] [2023-11-12 00:12:40,703 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-11-12 00:12:40,703 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:12:40,703 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e3ac585f-7e94-404d-aa2b-e34cc2092d0e/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 00:12:40,705 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e3ac585f-7e94-404d-aa2b-e34cc2092d0e/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-12 00:12:40,707 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e3ac585f-7e94-404d-aa2b-e34cc2092d0e/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2023-11-12 00:12:40,791 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-11-12 00:12:40,792 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-12 00:12:40,793 INFO L262 TraceCheckSpWp]: Trace formula consists of 83 conjuncts, 8 conjunts are in the unsatisfiable core [2023-11-12 00:12:40,794 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-12 00:12:41,276 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-11-12 00:12:41,276 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-12 00:12:41,740 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 3 proven. 6 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-11-12 00:12:41,740 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1783551444] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-12 00:12:41,741 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [702489659] [2023-11-12 00:12:41,743 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2023-11-12 00:12:41,743 INFO L166 IcfgInterpreter]: Building call graph [2023-11-12 00:12:41,744 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-12 00:12:41,744 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-12 00:12:41,744 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-12 00:12:42,079 INFO L180 IcfgInterpreter]: Interpretation finished