./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/loop-acceleration/array_1-1.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 0e0057cc Calling Ultimate with: /usr/lib/jvm/java-1.11.0-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57bd27da-3408-4713-b56e-3b71b2744380/bin/utaipan-verify-SwPr7d2a91/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57bd27da-3408-4713-b56e-3b71b2744380/bin/utaipan-verify-SwPr7d2a91/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57bd27da-3408-4713-b56e-3b71b2744380/bin/utaipan-verify-SwPr7d2a91/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57bd27da-3408-4713-b56e-3b71b2744380/bin/utaipan-verify-SwPr7d2a91/config/TaipanReach.xml -i ../../sv-benchmarks/c/loop-acceleration/array_1-1.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57bd27da-3408-4713-b56e-3b71b2744380/bin/utaipan-verify-SwPr7d2a91/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57bd27da-3408-4713-b56e-3b71b2744380/bin/utaipan-verify-SwPr7d2a91 --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 ae9ddd4d1a773404c3b608e065785029116017ed4a7aa9eefa9f9dc9ab8104a6 --- Real Ultimate output --- This is Ultimate 0.2.4-dev-0e0057c [2023-11-24 23:54:59,095 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-11-24 23:54:59,199 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57bd27da-3408-4713-b56e-3b71b2744380/bin/utaipan-verify-SwPr7d2a91/config/svcomp-Reach-32bit-Taipan_Default.epf [2023-11-24 23:54:59,204 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-11-24 23:54:59,205 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-11-24 23:54:59,231 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-11-24 23:54:59,232 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-11-24 23:54:59,233 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-11-24 23:54:59,234 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-11-24 23:54:59,234 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-11-24 23:54:59,235 INFO L153 SettingsManager]: * User list type=DISABLED [2023-11-24 23:54:59,236 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-11-24 23:54:59,236 INFO L153 SettingsManager]: * Explicit value domain=true [2023-11-24 23:54:59,237 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-11-24 23:54:59,237 INFO L153 SettingsManager]: * Octagon Domain=false [2023-11-24 23:54:59,238 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-11-24 23:54:59,238 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-11-24 23:54:59,239 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-11-24 23:54:59,240 INFO L153 SettingsManager]: * Interval Domain=false [2023-11-24 23:54:59,240 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-11-24 23:54:59,241 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-11-24 23:54:59,241 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2023-11-24 23:54:59,242 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-11-24 23:54:59,243 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-11-24 23:54:59,243 INFO L153 SettingsManager]: * sizeof long=4 [2023-11-24 23:54:59,244 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-11-24 23:54:59,244 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-11-24 23:54:59,245 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-11-24 23:54:59,245 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-11-24 23:54:59,245 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-11-24 23:54:59,246 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-11-24 23:54:59,246 INFO L153 SettingsManager]: * sizeof long double=12 [2023-11-24 23:54:59,247 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2023-11-24 23:54:59,247 INFO L153 SettingsManager]: * Use constant arrays=true [2023-11-24 23:54:59,247 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-11-24 23:54:59,248 INFO L153 SettingsManager]: * Only consider context switches at boundaries of atomic blocks=true [2023-11-24 23:54:59,248 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-11-24 23:54:59,248 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-24 23:54:59,248 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-11-24 23:54:59,249 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-11-24 23:54:59,249 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2023-11-24 23:54:59,250 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-11-24 23:54:59,250 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-11-24 23:54:59,250 INFO L153 SettingsManager]: * Apply one-shot large block encoding in concurrent analysis=false [2023-11-24 23:54:59,250 INFO L153 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-11-24 23:54:59,251 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-11-24 23:54:59,251 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-11-24 23:54:59,251 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_57bd27da-3408-4713-b56e-3b71b2744380/bin/utaipan-verify-SwPr7d2a91/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57bd27da-3408-4713-b56e-3b71b2744380/bin/utaipan-verify-SwPr7d2a91 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> ae9ddd4d1a773404c3b608e065785029116017ed4a7aa9eefa9f9dc9ab8104a6 [2023-11-24 23:54:59,601 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-11-24 23:54:59,636 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-11-24 23:54:59,639 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-11-24 23:54:59,641 INFO L270 PluginConnector]: Initializing CDTParser... [2023-11-24 23:54:59,642 INFO L274 PluginConnector]: CDTParser initialized [2023-11-24 23:54:59,643 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57bd27da-3408-4713-b56e-3b71b2744380/bin/utaipan-verify-SwPr7d2a91/../../sv-benchmarks/c/loop-acceleration/array_1-1.c [2023-11-24 23:55:03,252 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-11-24 23:55:03,519 INFO L384 CDTParser]: Found 1 translation units. [2023-11-24 23:55:03,520 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57bd27da-3408-4713-b56e-3b71b2744380/sv-benchmarks/c/loop-acceleration/array_1-1.c [2023-11-24 23:55:03,531 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57bd27da-3408-4713-b56e-3b71b2744380/bin/utaipan-verify-SwPr7d2a91/data/d7dff739d/c23f62d3af5d405abc38e366e882fbde/FLAG47e0d601d [2023-11-24 23:55:03,556 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57bd27da-3408-4713-b56e-3b71b2744380/bin/utaipan-verify-SwPr7d2a91/data/d7dff739d/c23f62d3af5d405abc38e366e882fbde [2023-11-24 23:55:03,567 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-11-24 23:55:03,569 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-11-24 23:55:03,574 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-11-24 23:55:03,574 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-11-24 23:55:03,581 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-11-24 23:55:03,585 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 24.11 11:55:03" (1/1) ... [2023-11-24 23:55:03,587 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@69751822 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 11:55:03, skipping insertion in model container [2023-11-24 23:55:03,587 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 24.11 11:55:03" (1/1) ... [2023-11-24 23:55:03,615 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-11-24 23:55:03,851 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_57bd27da-3408-4713-b56e-3b71b2744380/sv-benchmarks/c/loop-acceleration/array_1-1.c[321,334] [2023-11-24 23:55:03,869 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-24 23:55:03,885 INFO L202 MainTranslator]: Completed pre-run [2023-11-24 23:55:03,900 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_57bd27da-3408-4713-b56e-3b71b2744380/sv-benchmarks/c/loop-acceleration/array_1-1.c[321,334] [2023-11-24 23:55:03,907 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-24 23:55:03,928 INFO L206 MainTranslator]: Completed translation [2023-11-24 23:55:03,929 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 11:55:03 WrapperNode [2023-11-24 23:55:03,929 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-11-24 23:55:03,930 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-11-24 23:55:03,931 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-11-24 23:55:03,931 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-11-24 23:55:03,940 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 11:55:03" (1/1) ... [2023-11-24 23:55:03,948 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 11:55:03" (1/1) ... [2023-11-24 23:55:03,970 INFO L138 Inliner]: procedures = 13, calls = 12, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 31 [2023-11-24 23:55:03,970 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-11-24 23:55:03,971 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-11-24 23:55:03,971 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-11-24 23:55:03,972 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-11-24 23:55:03,983 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 11:55:03" (1/1) ... [2023-11-24 23:55:03,983 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 11:55:03" (1/1) ... [2023-11-24 23:55:03,998 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 11:55:03" (1/1) ... [2023-11-24 23:55:03,998 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 11:55:03" (1/1) ... [2023-11-24 23:55:04,003 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 11:55:03" (1/1) ... [2023-11-24 23:55:04,007 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 11:55:03" (1/1) ... [2023-11-24 23:55:04,008 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 11:55:03" (1/1) ... [2023-11-24 23:55:04,009 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 11:55:03" (1/1) ... [2023-11-24 23:55:04,020 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-11-24 23:55:04,023 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-11-24 23:55:04,023 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-11-24 23:55:04,023 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-11-24 23:55:04,024 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 11:55:03" (1/1) ... [2023-11-24 23:55:04,034 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-24 23:55:04,051 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57bd27da-3408-4713-b56e-3b71b2744380/bin/utaipan-verify-SwPr7d2a91/z3 [2023-11-24 23:55:04,072 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57bd27da-3408-4713-b56e-3b71b2744380/bin/utaipan-verify-SwPr7d2a91/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-11-24 23:55:04,086 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57bd27da-3408-4713-b56e-3b71b2744380/bin/utaipan-verify-SwPr7d2a91/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-11-24 23:55:04,141 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-11-24 23:55:04,141 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-11-24 23:55:04,142 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2023-11-24 23:55:04,142 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-11-24 23:55:04,144 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-11-24 23:55:04,145 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-11-24 23:55:04,145 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-11-24 23:55:04,145 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-11-24 23:55:04,243 INFO L241 CfgBuilder]: Building ICFG [2023-11-24 23:55:04,245 INFO L267 CfgBuilder]: Building CFG for each procedure with an implementation [2023-11-24 23:55:04,394 INFO L282 CfgBuilder]: Performing block encoding [2023-11-24 23:55:04,433 INFO L304 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-11-24 23:55:04,433 INFO L309 CfgBuilder]: Removed 1 assume(true) statements. [2023-11-24 23:55:04,435 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.11 11:55:04 BoogieIcfgContainer [2023-11-24 23:55:04,436 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-11-24 23:55:04,439 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-11-24 23:55:04,439 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-11-24 23:55:04,444 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-11-24 23:55:04,444 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 24.11 11:55:03" (1/3) ... [2023-11-24 23:55:04,445 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@584699b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 24.11 11:55:04, skipping insertion in model container [2023-11-24 23:55:04,446 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 24.11 11:55:03" (2/3) ... [2023-11-24 23:55:04,446 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@584699b and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 24.11 11:55:04, skipping insertion in model container [2023-11-24 23:55:04,447 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 24.11 11:55:04" (3/3) ... [2023-11-24 23:55:04,448 INFO L112 eAbstractionObserver]: Analyzing ICFG array_1-1.c [2023-11-24 23:55:04,473 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-11-24 23:55:04,473 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-11-24 23:55:04,547 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-11-24 23:55:04,559 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;@565d81ad, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-11-24 23:55:04,560 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-11-24 23:55:04,565 INFO L276 IsEmpty]: Start isEmpty. Operand has 7 states, 5 states have (on average 1.6) internal successors, (8), 6 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) [2023-11-24 23:55:04,571 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2023-11-24 23:55:04,572 INFO L187 NwaCegarLoop]: Found error trace [2023-11-24 23:55:04,572 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1] [2023-11-24 23:55:04,573 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-24 23:55:04,583 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-24 23:55:04,584 INFO L85 PathProgramCache]: Analyzing trace with hash 1882248, now seen corresponding path program 1 times [2023-11-24 23:55:04,595 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-24 23:55:04,596 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1427493000] [2023-11-24 23:55:04,597 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:55:04,597 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-24 23:55:04,762 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:55:04,941 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-24 23:55:04,941 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-24 23:55:04,942 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1427493000] [2023-11-24 23:55:04,943 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1427493000] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-24 23:55:04,944 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-24 23:55:04,945 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-11-24 23:55:04,947 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1610698827] [2023-11-24 23:55:04,948 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-24 23:55:04,954 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-24 23:55:04,956 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-24 23:55:05,005 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-24 23:55:05,006 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-24 23:55:05,009 INFO L87 Difference]: Start difference. First operand has 7 states, 5 states have (on average 1.6) internal successors, (8), 6 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) Second operand has 3 states, 3 states have (on average 1.3333333333333333) internal successors, (4), 2 states have internal predecessors, (4), 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) [2023-11-24 23:55:05,040 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-24 23:55:05,041 INFO L93 Difference]: Finished difference Result 13 states and 15 transitions. [2023-11-24 23:55:05,042 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-24 23:55:05,044 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 1.3333333333333333) internal successors, (4), 2 states have internal predecessors, (4), 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 4 [2023-11-24 23:55:05,044 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-24 23:55:05,053 INFO L225 Difference]: With dead ends: 13 [2023-11-24 23:55:05,053 INFO L226 Difference]: Without dead ends: 6 [2023-11-24 23:55:05,056 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-24 23:55:05,060 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 0 mSDsluCounter, 3 mSDsCounter, 0 mSdLazyCounter, 7 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 6 SdHoareTripleChecker+Invalid, 7 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 7 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-24 23:55:05,062 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 6 Invalid, 7 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 7 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-24 23:55:05,088 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 6 states. [2023-11-24 23:55:05,102 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 6 to 6. [2023-11-24 23:55:05,104 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 6 states, 5 states have (on average 1.2) internal successors, (6), 5 states have internal predecessors, (6), 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) [2023-11-24 23:55:05,105 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 6 states to 6 states and 6 transitions. [2023-11-24 23:55:05,107 INFO L78 Accepts]: Start accepts. Automaton has 6 states and 6 transitions. Word has length 4 [2023-11-24 23:55:05,107 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-24 23:55:05,109 INFO L495 AbstractCegarLoop]: Abstraction has 6 states and 6 transitions. [2023-11-24 23:55:05,109 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 1.3333333333333333) internal successors, (4), 2 states have internal predecessors, (4), 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) [2023-11-24 23:55:05,109 INFO L276 IsEmpty]: Start isEmpty. Operand 6 states and 6 transitions. [2023-11-24 23:55:05,110 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2023-11-24 23:55:05,110 INFO L187 NwaCegarLoop]: Found error trace [2023-11-24 23:55:05,110 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1] [2023-11-24 23:55:05,111 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-11-24 23:55:05,113 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-24 23:55:05,114 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-24 23:55:05,114 INFO L85 PathProgramCache]: Analyzing trace with hash 58276611, now seen corresponding path program 1 times [2023-11-24 23:55:05,115 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-24 23:55:05,115 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [671289397] [2023-11-24 23:55:05,116 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:55:05,117 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-24 23:55:05,162 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:55:05,325 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-24 23:55:05,325 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-24 23:55:05,326 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [671289397] [2023-11-24 23:55:05,326 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [671289397] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-24 23:55:05,326 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [43411481] [2023-11-24 23:55:05,327 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:55:05,327 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-24 23:55:05,327 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57bd27da-3408-4713-b56e-3b71b2744380/bin/utaipan-verify-SwPr7d2a91/z3 [2023-11-24 23:55:05,331 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57bd27da-3408-4713-b56e-3b71b2744380/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-24 23:55:05,354 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57bd27da-3408-4713-b56e-3b71b2744380/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-11-24 23:55:05,446 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:55:05,448 INFO L262 TraceCheckSpWp]: Trace formula consists of 52 conjuncts, 3 conjunts are in the unsatisfiable core [2023-11-24 23:55:05,453 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-24 23:55:05,501 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-24 23:55:05,502 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-24 23:55:05,543 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-24 23:55:05,549 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [43411481] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-24 23:55:05,549 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [675464462] [2023-11-24 23:55:05,572 INFO L159 IcfgInterpreter]: Started Sifa with 5 locations of interest [2023-11-24 23:55:05,573 INFO L166 IcfgInterpreter]: Building call graph [2023-11-24 23:55:05,577 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-24 23:55:05,583 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-24 23:55:05,584 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-24 23:55:06,025 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-24 23:55:06,126 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '67#(and (<= 1 |#StackHeapBarrier|) (<= 1024 |ULTIMATE.start_main_~i~0#1|) (<= 2 |ULTIMATE.start_main_~#A~0#1.base|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= |ULTIMATE.start_main_~#A~0#1.offset| 0) (= 1023 |ULTIMATE.start_main_#t~mem5#1|) (= 1023 (select (select |#memory_int| |ULTIMATE.start_main_~#A~0#1.base|) 4092)) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0))' at error location [2023-11-24 23:55:06,126 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-24 23:55:06,127 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-24 23:55:06,127 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3, 3] total 6 [2023-11-24 23:55:06,128 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [754912671] [2023-11-24 23:55:06,128 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-24 23:55:06,129 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-11-24 23:55:06,129 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-24 23:55:06,130 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-11-24 23:55:06,130 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=30, Invalid=60, Unknown=0, NotChecked=0, Total=90 [2023-11-24 23:55:06,131 INFO L87 Difference]: Start difference. First operand 6 states and 6 transitions. Second operand has 7 states, 7 states have (on average 1.4285714285714286) internal successors, (10), 6 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-24 23:55:06,149 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-24 23:55:06,149 INFO L93 Difference]: Finished difference Result 12 states and 14 transitions. [2023-11-24 23:55:06,149 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-11-24 23:55:06,150 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 1.4285714285714286) internal successors, (10), 6 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 5 [2023-11-24 23:55:06,150 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-24 23:55:06,150 INFO L225 Difference]: With dead ends: 12 [2023-11-24 23:55:06,151 INFO L226 Difference]: Without dead ends: 9 [2023-11-24 23:55:06,151 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 16 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=30, Invalid=60, Unknown=0, NotChecked=0, Total=90 [2023-11-24 23:55:06,153 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 0 mSDsluCounter, 8 mSDsCounter, 0 mSdLazyCounter, 12 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 10 SdHoareTripleChecker+Invalid, 13 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 12 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-24 23:55:06,153 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 10 Invalid, 13 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 12 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-24 23:55:06,154 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 9 states. [2023-11-24 23:55:06,156 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 9 to 9. [2023-11-24 23:55:06,157 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 9 states, 8 states have (on average 1.125) internal successors, (9), 8 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-24 23:55:06,157 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9 states to 9 states and 9 transitions. [2023-11-24 23:55:06,157 INFO L78 Accepts]: Start accepts. Automaton has 9 states and 9 transitions. Word has length 5 [2023-11-24 23:55:06,157 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-24 23:55:06,158 INFO L495 AbstractCegarLoop]: Abstraction has 9 states and 9 transitions. [2023-11-24 23:55:06,158 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 1.4285714285714286) internal successors, (10), 6 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-24 23:55:06,158 INFO L276 IsEmpty]: Start isEmpty. Operand 9 states and 9 transitions. [2023-11-24 23:55:06,159 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2023-11-24 23:55:06,159 INFO L187 NwaCegarLoop]: Found error trace [2023-11-24 23:55:06,159 INFO L195 NwaCegarLoop]: trace histogram [4, 1, 1, 1, 1] [2023-11-24 23:55:06,170 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57bd27da-3408-4713-b56e-3b71b2744380/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-11-24 23:55:06,365 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57bd27da-3408-4713-b56e-3b71b2744380/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-24 23:55:06,366 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-24 23:55:06,368 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-24 23:55:06,368 INFO L85 PathProgramCache]: Analyzing trace with hash 879165256, now seen corresponding path program 2 times [2023-11-24 23:55:06,371 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-24 23:55:06,372 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [879939100] [2023-11-24 23:55:06,372 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:55:06,372 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-24 23:55:06,408 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:55:06,504 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-24 23:55:06,505 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-24 23:55:06,505 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [879939100] [2023-11-24 23:55:06,505 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [879939100] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-24 23:55:06,506 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [908105434] [2023-11-24 23:55:06,506 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-24 23:55:06,506 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-24 23:55:06,506 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57bd27da-3408-4713-b56e-3b71b2744380/bin/utaipan-verify-SwPr7d2a91/z3 [2023-11-24 23:55:06,507 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57bd27da-3408-4713-b56e-3b71b2744380/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-24 23:55:06,525 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57bd27da-3408-4713-b56e-3b71b2744380/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-11-24 23:55:06,568 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2023-11-24 23:55:06,568 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-24 23:55:06,570 INFO L262 TraceCheckSpWp]: Trace formula consists of 73 conjuncts, 6 conjunts are in the unsatisfiable core [2023-11-24 23:55:06,571 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-24 23:55:06,590 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-24 23:55:06,590 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-24 23:55:06,653 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-24 23:55:06,654 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [908105434] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-24 23:55:06,654 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [623952376] [2023-11-24 23:55:06,656 INFO L159 IcfgInterpreter]: Started Sifa with 5 locations of interest [2023-11-24 23:55:06,657 INFO L166 IcfgInterpreter]: Building call graph [2023-11-24 23:55:06,657 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-24 23:55:06,657 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-24 23:55:06,658 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-24 23:55:06,837 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-24 23:55:06,935 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '156#(and (<= 1 |#StackHeapBarrier|) (<= 1024 |ULTIMATE.start_main_~i~0#1|) (<= 2 |ULTIMATE.start_main_~#A~0#1.base|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= |ULTIMATE.start_main_~#A~0#1.offset| 0) (= 1023 |ULTIMATE.start_main_#t~mem5#1|) (= 1023 (select (select |#memory_int| |ULTIMATE.start_main_~#A~0#1.base|) 4092)) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0))' at error location [2023-11-24 23:55:06,935 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-24 23:55:06,936 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-24 23:55:06,936 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 12 [2023-11-24 23:55:06,936 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [852707988] [2023-11-24 23:55:06,937 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-24 23:55:06,938 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2023-11-24 23:55:06,938 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-24 23:55:06,940 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2023-11-24 23:55:06,942 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=87, Invalid=153, Unknown=0, NotChecked=0, Total=240 [2023-11-24 23:55:06,943 INFO L87 Difference]: Start difference. First operand 9 states and 9 transitions. Second operand has 13 states, 13 states have (on average 1.2307692307692308) internal successors, (16), 12 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-24 23:55:06,989 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-24 23:55:06,989 INFO L93 Difference]: Finished difference Result 18 states and 23 transitions. [2023-11-24 23:55:06,990 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2023-11-24 23:55:06,990 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 1.2307692307692308) internal successors, (16), 12 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 8 [2023-11-24 23:55:06,991 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-24 23:55:06,991 INFO L225 Difference]: With dead ends: 18 [2023-11-24 23:55:06,991 INFO L226 Difference]: Without dead ends: 15 [2023-11-24 23:55:06,992 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 14 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 61 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=87, Invalid=153, Unknown=0, NotChecked=0, Total=240 [2023-11-24 23:55:06,993 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 0 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 15 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 6 SdHoareTripleChecker+Invalid, 16 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 15 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-24 23:55:06,994 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 6 Invalid, 16 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 15 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-24 23:55:06,995 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2023-11-24 23:55:06,998 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2023-11-24 23:55:06,998 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 15 states, 14 states have (on average 1.0714285714285714) internal successors, (15), 14 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) [2023-11-24 23:55:06,999 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 15 transitions. [2023-11-24 23:55:06,999 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 15 transitions. Word has length 8 [2023-11-24 23:55:06,999 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-24 23:55:07,000 INFO L495 AbstractCegarLoop]: Abstraction has 15 states and 15 transitions. [2023-11-24 23:55:07,000 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 1.2307692307692308) internal successors, (16), 12 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-24 23:55:07,000 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 15 transitions. [2023-11-24 23:55:07,001 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2023-11-24 23:55:07,001 INFO L187 NwaCegarLoop]: Found error trace [2023-11-24 23:55:07,001 INFO L195 NwaCegarLoop]: trace histogram [10, 1, 1, 1, 1] [2023-11-24 23:55:07,012 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57bd27da-3408-4713-b56e-3b71b2744380/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2023-11-24 23:55:07,207 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57bd27da-3408-4713-b56e-3b71b2744380/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-24 23:55:07,208 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-24 23:55:07,208 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-24 23:55:07,208 INFO L85 PathProgramCache]: Analyzing trace with hash -1406479000, now seen corresponding path program 3 times [2023-11-24 23:55:07,208 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-24 23:55:07,209 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [949004083] [2023-11-24 23:55:07,209 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:55:07,209 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-24 23:55:07,247 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:55:07,591 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-24 23:55:07,593 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-24 23:55:07,594 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [949004083] [2023-11-24 23:55:07,595 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [949004083] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-24 23:55:07,595 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [355040727] [2023-11-24 23:55:07,595 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-11-24 23:55:07,596 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-24 23:55:07,596 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57bd27da-3408-4713-b56e-3b71b2744380/bin/utaipan-verify-SwPr7d2a91/z3 [2023-11-24 23:55:07,597 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57bd27da-3408-4713-b56e-3b71b2744380/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-24 23:55:07,626 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57bd27da-3408-4713-b56e-3b71b2744380/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-11-24 23:55:07,686 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-11-24 23:55:07,686 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-24 23:55:07,687 INFO L262 TraceCheckSpWp]: Trace formula consists of 115 conjuncts, 12 conjunts are in the unsatisfiable core [2023-11-24 23:55:07,691 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-24 23:55:07,748 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-24 23:55:07,748 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-24 23:55:08,081 INFO L134 CoverageAnalysis]: Checked inductivity of 55 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-24 23:55:08,081 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [355040727] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-24 23:55:08,081 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1104471010] [2023-11-24 23:55:08,085 INFO L159 IcfgInterpreter]: Started Sifa with 5 locations of interest [2023-11-24 23:55:08,086 INFO L166 IcfgInterpreter]: Building call graph [2023-11-24 23:55:08,087 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-24 23:55:08,087 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-24 23:55:08,087 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-24 23:55:08,270 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-24 23:55:08,380 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '317#(and (<= 1 |#StackHeapBarrier|) (<= 1024 |ULTIMATE.start_main_~i~0#1|) (<= 2 |ULTIMATE.start_main_~#A~0#1.base|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= |ULTIMATE.start_main_~#A~0#1.offset| 0) (= 1023 |ULTIMATE.start_main_#t~mem5#1|) (= 1023 (select (select |#memory_int| |ULTIMATE.start_main_~#A~0#1.base|) 4092)) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0))' at error location [2023-11-24 23:55:08,380 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-24 23:55:08,381 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-24 23:55:08,381 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 12, 12] total 24 [2023-11-24 23:55:08,381 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [364546007] [2023-11-24 23:55:08,382 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-24 23:55:08,383 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2023-11-24 23:55:08,383 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-24 23:55:08,384 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2023-11-24 23:55:08,385 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=309, Invalid=447, Unknown=0, NotChecked=0, Total=756 [2023-11-24 23:55:08,386 INFO L87 Difference]: Start difference. First operand 15 states and 15 transitions. Second operand has 25 states, 25 states have (on average 1.12) internal successors, (28), 24 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-24 23:55:08,436 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-24 23:55:08,436 INFO L93 Difference]: Finished difference Result 30 states and 41 transitions. [2023-11-24 23:55:08,437 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2023-11-24 23:55:08,437 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 1.12) internal successors, (28), 24 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 14 [2023-11-24 23:55:08,438 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-24 23:55:08,439 INFO L225 Difference]: With dead ends: 30 [2023-11-24 23:55:08,439 INFO L226 Difference]: Without dead ends: 27 [2023-11-24 23:55:08,440 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 26 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 139 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=309, Invalid=447, Unknown=0, NotChecked=0, Total=756 [2023-11-24 23:55:08,441 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 0 mSDsluCounter, 8 mSDsCounter, 0 mSdLazyCounter, 29 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 10 SdHoareTripleChecker+Invalid, 30 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 29 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-24 23:55:08,442 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 10 Invalid, 30 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 29 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-24 23:55:08,443 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 27 states. [2023-11-24 23:55:08,447 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 27 to 27. [2023-11-24 23:55:08,451 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 26 states have (on average 1.0384615384615385) internal successors, (27), 26 states have internal predecessors, (27), 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) [2023-11-24 23:55:08,452 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 27 transitions. [2023-11-24 23:55:08,453 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 27 transitions. Word has length 14 [2023-11-24 23:55:08,454 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-24 23:55:08,455 INFO L495 AbstractCegarLoop]: Abstraction has 27 states and 27 transitions. [2023-11-24 23:55:08,458 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 25 states have (on average 1.12) internal successors, (28), 24 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-24 23:55:08,458 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 27 transitions. [2023-11-24 23:55:08,459 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2023-11-24 23:55:08,460 INFO L187 NwaCegarLoop]: Found error trace [2023-11-24 23:55:08,460 INFO L195 NwaCegarLoop]: trace histogram [22, 1, 1, 1, 1] [2023-11-24 23:55:08,475 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57bd27da-3408-4713-b56e-3b71b2744380/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2023-11-24 23:55:08,667 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57bd27da-3408-4713-b56e-3b71b2744380/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-24 23:55:08,667 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-24 23:55:08,668 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-24 23:55:08,668 INFO L85 PathProgramCache]: Analyzing trace with hash 1527855528, now seen corresponding path program 4 times [2023-11-24 23:55:08,668 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-24 23:55:08,669 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [738844317] [2023-11-24 23:55:08,669 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:55:08,669 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-24 23:55:08,719 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:55:09,488 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-24 23:55:09,489 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-24 23:55:09,489 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [738844317] [2023-11-24 23:55:09,489 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [738844317] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-24 23:55:09,490 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1106003298] [2023-11-24 23:55:09,490 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-11-24 23:55:09,490 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-24 23:55:09,490 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57bd27da-3408-4713-b56e-3b71b2744380/bin/utaipan-verify-SwPr7d2a91/z3 [2023-11-24 23:55:09,492 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57bd27da-3408-4713-b56e-3b71b2744380/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-24 23:55:09,509 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57bd27da-3408-4713-b56e-3b71b2744380/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-11-24 23:55:09,602 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:55:09,604 INFO L262 TraceCheckSpWp]: Trace formula consists of 199 conjuncts, 24 conjunts are in the unsatisfiable core [2023-11-24 23:55:09,607 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-24 23:55:09,677 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-24 23:55:09,678 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-24 23:55:10,695 INFO L134 CoverageAnalysis]: Checked inductivity of 253 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-24 23:55:10,696 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1106003298] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-24 23:55:10,696 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [253537811] [2023-11-24 23:55:10,698 INFO L159 IcfgInterpreter]: Started Sifa with 5 locations of interest [2023-11-24 23:55:10,698 INFO L166 IcfgInterpreter]: Building call graph [2023-11-24 23:55:10,699 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-24 23:55:10,699 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-24 23:55:10,699 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-24 23:55:10,854 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-24 23:55:10,979 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '622#(and (<= 1 |#StackHeapBarrier|) (<= 1024 |ULTIMATE.start_main_~i~0#1|) (<= 2 |ULTIMATE.start_main_~#A~0#1.base|) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= |ULTIMATE.start_main_~#A~0#1.offset| 0) (= 1023 |ULTIMATE.start_main_#t~mem5#1|) (= 1023 (select (select |#memory_int| |ULTIMATE.start_main_~#A~0#1.base|) 4092)) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0))' at error location [2023-11-24 23:55:10,980 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-24 23:55:10,980 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-24 23:55:10,980 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [24, 24, 24] total 48 [2023-11-24 23:55:10,980 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [426108931] [2023-11-24 23:55:10,981 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-24 23:55:10,982 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 49 states [2023-11-24 23:55:10,983 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-24 23:55:10,986 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2023-11-24 23:55:10,987 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1185, Invalid=1467, Unknown=0, NotChecked=0, Total=2652 [2023-11-24 23:55:10,989 INFO L87 Difference]: Start difference. First operand 27 states and 27 transitions. Second operand has 49 states, 49 states have (on average 1.0612244897959184) internal successors, (52), 48 states have internal predecessors, (52), 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) [2023-11-24 23:55:11,090 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-24 23:55:11,090 INFO L93 Difference]: Finished difference Result 54 states and 77 transitions. [2023-11-24 23:55:11,091 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 48 states. [2023-11-24 23:55:11,091 INFO L78 Accepts]: Start accepts. Automaton has has 49 states, 49 states have (on average 1.0612244897959184) internal successors, (52), 48 states have internal predecessors, (52), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 26 [2023-11-24 23:55:11,092 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-24 23:55:11,094 INFO L225 Difference]: With dead ends: 54 [2023-11-24 23:55:11,095 INFO L226 Difference]: Without dead ends: 51 [2023-11-24 23:55:11,096 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 100 GetRequests, 50 SyntacticMatches, 0 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 295 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=1185, Invalid=1467, Unknown=0, NotChecked=0, Total=2652 [2023-11-24 23:55:11,100 INFO L413 NwaCegarLoop]: 2 mSDtfsCounter, 0 mSDsluCounter, 8 mSDsCounter, 0 mSdLazyCounter, 53 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 10 SdHoareTripleChecker+Invalid, 54 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 53 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-24 23:55:11,101 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 10 Invalid, 54 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 53 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-24 23:55:11,103 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 51 states. [2023-11-24 23:55:11,117 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 51 to 51. [2023-11-24 23:55:11,117 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 51 states, 50 states have (on average 1.02) internal successors, (51), 50 states have internal predecessors, (51), 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) [2023-11-24 23:55:11,121 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 51 states to 51 states and 51 transitions. [2023-11-24 23:55:11,121 INFO L78 Accepts]: Start accepts. Automaton has 51 states and 51 transitions. Word has length 26 [2023-11-24 23:55:11,122 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-24 23:55:11,122 INFO L495 AbstractCegarLoop]: Abstraction has 51 states and 51 transitions. [2023-11-24 23:55:11,123 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 49 states, 49 states have (on average 1.0612244897959184) internal successors, (52), 48 states have internal predecessors, (52), 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) [2023-11-24 23:55:11,123 INFO L276 IsEmpty]: Start isEmpty. Operand 51 states and 51 transitions. [2023-11-24 23:55:11,125 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2023-11-24 23:55:11,126 INFO L187 NwaCegarLoop]: Found error trace [2023-11-24 23:55:11,126 INFO L195 NwaCegarLoop]: trace histogram [46, 1, 1, 1, 1] [2023-11-24 23:55:11,134 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57bd27da-3408-4713-b56e-3b71b2744380/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2023-11-24 23:55:11,332 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57bd27da-3408-4713-b56e-3b71b2744380/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-24 23:55:11,333 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-24 23:55:11,333 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-24 23:55:11,333 INFO L85 PathProgramCache]: Analyzing trace with hash 2001789480, now seen corresponding path program 5 times [2023-11-24 23:55:11,333 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-24 23:55:11,333 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [854914940] [2023-11-24 23:55:11,334 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-24 23:55:11,334 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-24 23:55:11,412 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-24 23:55:13,561 INFO L134 CoverageAnalysis]: Checked inductivity of 1081 backedges. 0 proven. 1081 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-24 23:55:13,562 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-24 23:55:13,562 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [854914940] [2023-11-24 23:55:13,562 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [854914940] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-24 23:55:13,562 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1094432496] [2023-11-24 23:55:13,562 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-24 23:55:13,562 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-24 23:55:13,563 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57bd27da-3408-4713-b56e-3b71b2744380/bin/utaipan-verify-SwPr7d2a91/z3 [2023-11-24 23:55:13,567 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57bd27da-3408-4713-b56e-3b71b2744380/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-24 23:55:13,575 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_57bd27da-3408-4713-b56e-3b71b2744380/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process