./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/loops-crafted-1/nested3-1_abstracted.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 0e0057cc Calling Ultimate with: /usr/lib/jvm/java-11-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9a582613-7e16-4d29-b94d-3303f9d128de/bin/utaipan-verify-SwPr7d2a91/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9a582613-7e16-4d29-b94d-3303f9d128de/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_9a582613-7e16-4d29-b94d-3303f9d128de/bin/utaipan-verify-SwPr7d2a91/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9a582613-7e16-4d29-b94d-3303f9d128de/bin/utaipan-verify-SwPr7d2a91/config/TaipanReach.xml -i ../../sv-benchmarks/c/loops-crafted-1/nested3-1_abstracted.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9a582613-7e16-4d29-b94d-3303f9d128de/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_9a582613-7e16-4d29-b94d-3303f9d128de/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 898ef25fdb2ae04f56304d500631f410c196b9a77fbfba6f83248dcfc33b301f --- Real Ultimate output --- This is Ultimate 0.2.4-dev-0e0057c [2023-11-25 00:05:45,408 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-11-25 00:05:45,527 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9a582613-7e16-4d29-b94d-3303f9d128de/bin/utaipan-verify-SwPr7d2a91/config/svcomp-Reach-32bit-Taipan_Default.epf [2023-11-25 00:05:45,532 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-11-25 00:05:45,532 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-11-25 00:05:45,577 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-11-25 00:05:45,578 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-11-25 00:05:45,579 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-11-25 00:05:45,580 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-11-25 00:05:45,582 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-11-25 00:05:45,582 INFO L153 SettingsManager]: * User list type=DISABLED [2023-11-25 00:05:45,583 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-11-25 00:05:45,583 INFO L153 SettingsManager]: * Explicit value domain=true [2023-11-25 00:05:45,584 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-11-25 00:05:45,584 INFO L153 SettingsManager]: * Octagon Domain=false [2023-11-25 00:05:45,585 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-11-25 00:05:45,585 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-11-25 00:05:45,586 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-11-25 00:05:45,586 INFO L153 SettingsManager]: * Interval Domain=false [2023-11-25 00:05:45,587 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-11-25 00:05:45,587 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-11-25 00:05:45,589 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2023-11-25 00:05:45,591 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-11-25 00:05:45,591 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-11-25 00:05:45,592 INFO L153 SettingsManager]: * sizeof long=4 [2023-11-25 00:05:45,592 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-11-25 00:05:45,592 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-11-25 00:05:45,593 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-11-25 00:05:45,593 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-11-25 00:05:45,594 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-11-25 00:05:45,595 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-11-25 00:05:45,595 INFO L153 SettingsManager]: * sizeof long double=12 [2023-11-25 00:05:45,596 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2023-11-25 00:05:45,596 INFO L153 SettingsManager]: * Use constant arrays=true [2023-11-25 00:05:45,596 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-11-25 00:05:45,597 INFO L153 SettingsManager]: * Only consider context switches at boundaries of atomic blocks=true [2023-11-25 00:05:45,597 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-11-25 00:05:45,614 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-25 00:05:45,615 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-11-25 00:05:45,615 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-11-25 00:05:45,616 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2023-11-25 00:05:45,616 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-11-25 00:05:45,617 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-11-25 00:05:45,617 INFO L153 SettingsManager]: * Apply one-shot large block encoding in concurrent analysis=false [2023-11-25 00:05:45,617 INFO L153 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-11-25 00:05:45,618 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-11-25 00:05:45,618 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-11-25 00:05:45,618 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_9a582613-7e16-4d29-b94d-3303f9d128de/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9a582613-7e16-4d29-b94d-3303f9d128de/bin/utaipan-verify-SwPr7d2a91 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 898ef25fdb2ae04f56304d500631f410c196b9a77fbfba6f83248dcfc33b301f [2023-11-25 00:05:45,930 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-11-25 00:05:45,957 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-11-25 00:05:45,961 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-11-25 00:05:45,963 INFO L270 PluginConnector]: Initializing CDTParser... [2023-11-25 00:05:45,963 INFO L274 PluginConnector]: CDTParser initialized [2023-11-25 00:05:45,965 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9a582613-7e16-4d29-b94d-3303f9d128de/bin/utaipan-verify-SwPr7d2a91/../../sv-benchmarks/c/loops-crafted-1/nested3-1_abstracted.c [2023-11-25 00:05:49,022 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-11-25 00:05:49,229 INFO L384 CDTParser]: Found 1 translation units. [2023-11-25 00:05:49,230 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9a582613-7e16-4d29-b94d-3303f9d128de/sv-benchmarks/c/loops-crafted-1/nested3-1_abstracted.c [2023-11-25 00:05:49,236 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9a582613-7e16-4d29-b94d-3303f9d128de/bin/utaipan-verify-SwPr7d2a91/data/5c069611f/42815e92415e4f38b8b4d77bb33cd2bf/FLAG9f5247a38 [2023-11-25 00:05:49,249 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9a582613-7e16-4d29-b94d-3303f9d128de/bin/utaipan-verify-SwPr7d2a91/data/5c069611f/42815e92415e4f38b8b4d77bb33cd2bf [2023-11-25 00:05:49,252 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-11-25 00:05:49,253 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-11-25 00:05:49,255 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-11-25 00:05:49,255 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-11-25 00:05:49,261 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-11-25 00:05:49,262 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 12:05:49" (1/1) ... [2023-11-25 00:05:49,263 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@27967689 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 12:05:49, skipping insertion in model container [2023-11-25 00:05:49,263 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 25.11 12:05:49" (1/1) ... [2023-11-25 00:05:49,285 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-11-25 00:05:49,447 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_9a582613-7e16-4d29-b94d-3303f9d128de/sv-benchmarks/c/loops-crafted-1/nested3-1_abstracted.c[739,752] [2023-11-25 00:05:49,463 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-25 00:05:49,473 INFO L202 MainTranslator]: Completed pre-run [2023-11-25 00:05:49,484 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_9a582613-7e16-4d29-b94d-3303f9d128de/sv-benchmarks/c/loops-crafted-1/nested3-1_abstracted.c[739,752] [2023-11-25 00:05:49,490 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-25 00:05:49,505 INFO L206 MainTranslator]: Completed translation [2023-11-25 00:05:49,505 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 12:05:49 WrapperNode [2023-11-25 00:05:49,505 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-11-25 00:05:49,507 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-11-25 00:05:49,507 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-11-25 00:05:49,507 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-11-25 00:05:49,515 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 12:05:49" (1/1) ... [2023-11-25 00:05:49,521 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 12:05:49" (1/1) ... [2023-11-25 00:05:49,537 INFO L138 Inliner]: procedures = 20, calls = 10, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 46 [2023-11-25 00:05:49,537 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-11-25 00:05:49,538 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-11-25 00:05:49,538 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-11-25 00:05:49,538 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-11-25 00:05:49,546 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 12:05:49" (1/1) ... [2023-11-25 00:05:49,546 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 12:05:49" (1/1) ... [2023-11-25 00:05:49,548 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 12:05:49" (1/1) ... [2023-11-25 00:05:49,548 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 12:05:49" (1/1) ... [2023-11-25 00:05:49,551 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 12:05:49" (1/1) ... [2023-11-25 00:05:49,555 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 12:05:49" (1/1) ... [2023-11-25 00:05:49,556 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 12:05:49" (1/1) ... [2023-11-25 00:05:49,557 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 12:05:49" (1/1) ... [2023-11-25 00:05:49,558 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-11-25 00:05:49,570 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-11-25 00:05:49,570 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-11-25 00:05:49,570 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-11-25 00:05:49,571 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 12:05:49" (1/1) ... [2023-11-25 00:05:49,585 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-25 00:05:49,597 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9a582613-7e16-4d29-b94d-3303f9d128de/bin/utaipan-verify-SwPr7d2a91/z3 [2023-11-25 00:05:49,613 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9a582613-7e16-4d29-b94d-3303f9d128de/bin/utaipan-verify-SwPr7d2a91/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-11-25 00:05:49,619 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9a582613-7e16-4d29-b94d-3303f9d128de/bin/utaipan-verify-SwPr7d2a91/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-11-25 00:05:49,644 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-11-25 00:05:49,645 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-11-25 00:05:49,645 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-11-25 00:05:49,645 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-11-25 00:05:49,645 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2023-11-25 00:05:49,645 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2023-11-25 00:05:49,713 INFO L241 CfgBuilder]: Building ICFG [2023-11-25 00:05:49,716 INFO L267 CfgBuilder]: Building CFG for each procedure with an implementation [2023-11-25 00:05:49,911 INFO L282 CfgBuilder]: Performing block encoding [2023-11-25 00:05:49,974 INFO L304 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-11-25 00:05:49,974 INFO L309 CfgBuilder]: Removed 2 assume(true) statements. [2023-11-25 00:05:49,976 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 12:05:49 BoogieIcfgContainer [2023-11-25 00:05:49,976 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-11-25 00:05:49,979 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-11-25 00:05:49,979 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-11-25 00:05:49,982 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-11-25 00:05:49,982 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 25.11 12:05:49" (1/3) ... [2023-11-25 00:05:49,983 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6f5cf844 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 12:05:49, skipping insertion in model container [2023-11-25 00:05:49,983 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 25.11 12:05:49" (2/3) ... [2023-11-25 00:05:49,983 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@6f5cf844 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 25.11 12:05:49, skipping insertion in model container [2023-11-25 00:05:49,984 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 25.11 12:05:49" (3/3) ... [2023-11-25 00:05:49,985 INFO L112 eAbstractionObserver]: Analyzing ICFG nested3-1_abstracted.c [2023-11-25 00:05:50,003 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-11-25 00:05:50,004 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-11-25 00:05:50,049 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-11-25 00:05:50,055 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;@2f426571, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-11-25 00:05:50,055 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-11-25 00:05:50,059 INFO L276 IsEmpty]: Start isEmpty. Operand has 16 states, 10 states have (on average 1.4) internal successors, (14), 11 states have internal predecessors, (14), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-11-25 00:05:50,067 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2023-11-25 00:05:50,067 INFO L187 NwaCegarLoop]: Found error trace [2023-11-25 00:05:50,068 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2023-11-25 00:05:50,069 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-25 00:05:50,074 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-25 00:05:50,074 INFO L85 PathProgramCache]: Analyzing trace with hash -1091749507, now seen corresponding path program 1 times [2023-11-25 00:05:50,084 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-25 00:05:50,084 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2101656262] [2023-11-25 00:05:50,084 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-25 00:05:50,085 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-25 00:05:50,189 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-25 00:05:50,405 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-25 00:05:50,406 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-25 00:05:50,406 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2101656262] [2023-11-25 00:05:50,407 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2101656262] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-25 00:05:50,414 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-25 00:05:50,414 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-11-25 00:05:50,416 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1045424163] [2023-11-25 00:05:50,417 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-25 00:05:50,421 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-25 00:05:50,422 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-25 00:05:50,464 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-25 00:05:50,465 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-25 00:05:50,468 INFO L87 Difference]: Start difference. First operand has 16 states, 10 states have (on average 1.4) internal successors, (14), 11 states have internal predecessors, (14), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Second operand has 3 states, 3 states have (on average 1.6666666666666667) internal successors, (5), 2 states have internal predecessors, (5), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-25 00:05:50,551 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-25 00:05:50,551 INFO L93 Difference]: Finished difference Result 37 states and 54 transitions. [2023-11-25 00:05:50,552 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-25 00:05:50,554 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 1.6666666666666667) internal successors, (5), 2 states have internal predecessors, (5), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 6 [2023-11-25 00:05:50,554 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-25 00:05:50,561 INFO L225 Difference]: With dead ends: 37 [2023-11-25 00:05:50,561 INFO L226 Difference]: Without dead ends: 20 [2023-11-25 00:05:50,565 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 [2023-11-25 00:05:50,571 INFO L413 NwaCegarLoop]: 12 mSDtfsCounter, 4 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 13 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 24 SdHoareTripleChecker+Invalid, 13 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 13 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-25 00:05:50,572 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [6 Valid, 24 Invalid, 13 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 13 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-25 00:05:50,589 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2023-11-25 00:05:50,609 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 15. [2023-11-25 00:05:50,610 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 15 states, 10 states have (on average 1.3) internal successors, (13), 11 states have internal predecessors, (13), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-11-25 00:05:50,612 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 18 transitions. [2023-11-25 00:05:50,614 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 18 transitions. Word has length 6 [2023-11-25 00:05:50,614 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-25 00:05:50,615 INFO L495 AbstractCegarLoop]: Abstraction has 15 states and 18 transitions. [2023-11-25 00:05:50,615 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 1.6666666666666667) internal successors, (5), 2 states have internal predecessors, (5), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-25 00:05:50,616 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 18 transitions. [2023-11-25 00:05:50,619 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2023-11-25 00:05:50,620 INFO L187 NwaCegarLoop]: Found error trace [2023-11-25 00:05:50,620 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2023-11-25 00:05:50,620 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-11-25 00:05:50,621 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-25 00:05:50,622 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-25 00:05:50,622 INFO L85 PathProgramCache]: Analyzing trace with hash -1655309817, now seen corresponding path program 1 times [2023-11-25 00:05:50,622 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-25 00:05:50,623 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [506349572] [2023-11-25 00:05:50,623 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-25 00:05:50,623 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-25 00:05:50,643 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-25 00:05:50,704 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-25 00:05:50,705 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-25 00:05:50,705 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [506349572] [2023-11-25 00:05:50,705 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [506349572] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-25 00:05:50,705 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-25 00:05:50,706 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-11-25 00:05:50,706 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2119763063] [2023-11-25 00:05:50,706 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-25 00:05:50,707 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-25 00:05:50,708 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-25 00:05:50,708 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-25 00:05:50,709 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-25 00:05:50,709 INFO L87 Difference]: Start difference. First operand 15 states and 18 transitions. Second operand has 3 states, 3 states have (on average 2.0) internal successors, (6), 3 states have internal predecessors, (6), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-25 00:05:50,733 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-25 00:05:50,733 INFO L93 Difference]: Finished difference Result 31 states and 39 transitions. [2023-11-25 00:05:50,734 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-25 00:05:50,734 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.0) internal successors, (6), 3 states have internal predecessors, (6), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 7 [2023-11-25 00:05:50,734 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-25 00:05:50,735 INFO L225 Difference]: With dead ends: 31 [2023-11-25 00:05:50,735 INFO L226 Difference]: Without dead ends: 18 [2023-11-25 00:05:50,736 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-25 00:05:50,738 INFO L413 NwaCegarLoop]: 12 mSDtfsCounter, 1 mSDsluCounter, 11 mSDsCounter, 0 mSdLazyCounter, 9 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 23 SdHoareTripleChecker+Invalid, 10 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 9 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-25 00:05:50,739 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [2 Valid, 23 Invalid, 10 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 9 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-25 00:05:50,740 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2023-11-25 00:05:50,744 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 16. [2023-11-25 00:05:50,744 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 16 states, 11 states have (on average 1.2727272727272727) internal successors, (14), 12 states have internal predecessors, (14), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-11-25 00:05:50,745 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 19 transitions. [2023-11-25 00:05:50,745 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 19 transitions. Word has length 7 [2023-11-25 00:05:50,746 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-25 00:05:50,746 INFO L495 AbstractCegarLoop]: Abstraction has 16 states and 19 transitions. [2023-11-25 00:05:50,746 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 2.0) internal successors, (6), 3 states have internal predecessors, (6), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-25 00:05:50,746 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 19 transitions. [2023-11-25 00:05:50,747 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2023-11-25 00:05:50,747 INFO L187 NwaCegarLoop]: Found error trace [2023-11-25 00:05:50,748 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2023-11-25 00:05:50,748 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2023-11-25 00:05:50,748 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-25 00:05:50,749 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-25 00:05:50,750 INFO L85 PathProgramCache]: Analyzing trace with hash -1647057710, now seen corresponding path program 1 times [2023-11-25 00:05:50,750 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-25 00:05:50,751 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [876907576] [2023-11-25 00:05:50,751 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-25 00:05:50,752 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-25 00:05:50,789 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-25 00:05:50,937 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-25 00:05:50,938 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-25 00:05:50,938 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [876907576] [2023-11-25 00:05:50,938 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [876907576] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-25 00:05:50,938 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-25 00:05:50,939 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2023-11-25 00:05:50,939 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [159553718] [2023-11-25 00:05:50,939 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-25 00:05:50,939 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-11-25 00:05:50,940 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-25 00:05:50,940 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-11-25 00:05:50,941 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-11-25 00:05:50,941 INFO L87 Difference]: Start difference. First operand 16 states and 19 transitions. Second operand has 5 states, 4 states have (on average 1.5) internal successors, (6), 4 states have internal predecessors, (6), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-25 00:05:51,011 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-25 00:05:51,011 INFO L93 Difference]: Finished difference Result 23 states and 25 transitions. [2023-11-25 00:05:51,012 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-11-25 00:05:51,012 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 1.5) internal successors, (6), 4 states have internal predecessors, (6), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 7 [2023-11-25 00:05:51,013 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-25 00:05:51,013 INFO L225 Difference]: With dead ends: 23 [2023-11-25 00:05:51,014 INFO L226 Difference]: Without dead ends: 21 [2023-11-25 00:05:51,014 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2023-11-25 00:05:51,016 INFO L413 NwaCegarLoop]: 11 mSDtfsCounter, 10 mSDsluCounter, 26 mSDsCounter, 0 mSdLazyCounter, 29 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 37 SdHoareTripleChecker+Invalid, 29 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 29 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-25 00:05:51,016 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [12 Valid, 37 Invalid, 29 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 29 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-25 00:05:51,017 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2023-11-25 00:05:51,024 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 20. [2023-11-25 00:05:51,024 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20 states, 14 states have (on average 1.2142857142857142) internal successors, (17), 15 states have internal predecessors, (17), 3 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-11-25 00:05:51,025 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 22 transitions. [2023-11-25 00:05:51,025 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 22 transitions. Word has length 7 [2023-11-25 00:05:51,025 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-25 00:05:51,025 INFO L495 AbstractCegarLoop]: Abstraction has 20 states and 22 transitions. [2023-11-25 00:05:51,026 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 1.5) internal successors, (6), 4 states have internal predecessors, (6), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-25 00:05:51,026 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 22 transitions. [2023-11-25 00:05:51,027 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2023-11-25 00:05:51,027 INFO L187 NwaCegarLoop]: Found error trace [2023-11-25 00:05:51,027 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-25 00:05:51,027 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2023-11-25 00:05:51,027 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-25 00:05:51,028 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-25 00:05:51,028 INFO L85 PathProgramCache]: Analyzing trace with hash -1577091667, now seen corresponding path program 1 times [2023-11-25 00:05:51,028 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-25 00:05:51,028 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [813975177] [2023-11-25 00:05:51,029 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-25 00:05:51,029 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-25 00:05:51,044 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-25 00:05:51,152 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-25 00:05:51,152 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-25 00:05:51,152 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [813975177] [2023-11-25 00:05:51,153 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [813975177] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-25 00:05:51,153 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1223105187] [2023-11-25 00:05:51,153 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-25 00:05:51,153 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-25 00:05:51,154 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9a582613-7e16-4d29-b94d-3303f9d128de/bin/utaipan-verify-SwPr7d2a91/z3 [2023-11-25 00:05:51,160 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9a582613-7e16-4d29-b94d-3303f9d128de/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-25 00:05:51,183 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9a582613-7e16-4d29-b94d-3303f9d128de/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-11-25 00:05:51,248 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-25 00:05:51,250 INFO L262 TraceCheckSpWp]: Trace formula consists of 57 conjuncts, 7 conjunts are in the unsatisfiable core [2023-11-25 00:05:51,255 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-25 00:05:51,337 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-25 00:05:51,337 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-25 00:05:51,413 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-25 00:05:51,414 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1223105187] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-25 00:05:51,414 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [529645212] [2023-11-25 00:05:51,441 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2023-11-25 00:05:51,441 INFO L166 IcfgInterpreter]: Building call graph [2023-11-25 00:05:51,448 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-25 00:05:51,453 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-25 00:05:51,454 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-25 00:05:52,717 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 83 for LOIs [2023-11-25 00:05:53,314 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-25 00:05:55,947 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '326#(and (exists ((|v_ULTIMATE.start_main_~x~0#1_BEFORE_CALL_9| Int) (|v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_12| Int) (|v_ULTIMATE.start_main_~w~0#1_BEFORE_CALL_9| Int)) (and (<= 1 |#StackHeapBarrier|) (= (mod |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_12| 2) 0) (= |v_ULTIMATE.start_main_~x~0#1_BEFORE_CALL_9| 0) (<= 1 |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_12|) (= |v_ULTIMATE.start_main_~w~0#1_BEFORE_CALL_9| 0) (<= 268435455 (mod |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_12| 4294967296)))) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0))' at error location [2023-11-25 00:05:55,948 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-25 00:05:55,948 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-25 00:05:55,948 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 6, 6] total 9 [2023-11-25 00:05:55,948 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [474471076] [2023-11-25 00:05:55,949 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-25 00:05:55,951 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2023-11-25 00:05:55,952 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-25 00:05:55,954 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2023-11-25 00:05:55,955 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=253, Unknown=0, NotChecked=0, Total=306 [2023-11-25 00:05:55,956 INFO L87 Difference]: Start difference. First operand 20 states and 22 transitions. Second operand has 9 states, 9 states have (on average 2.111111111111111) internal successors, (19), 8 states have internal predecessors, (19), 5 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-11-25 00:05:56,137 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-25 00:05:56,137 INFO L93 Difference]: Finished difference Result 54 states and 65 transitions. [2023-11-25 00:05:56,137 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2023-11-25 00:05:56,138 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 2.111111111111111) internal successors, (19), 8 states have internal predecessors, (19), 5 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 14 [2023-11-25 00:05:56,138 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-25 00:05:56,140 INFO L225 Difference]: With dead ends: 54 [2023-11-25 00:05:56,141 INFO L226 Difference]: Without dead ends: 36 [2023-11-25 00:05:56,145 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 27 SyntacticMatches, 2 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 79 ImplicationChecksByTransitivity, 2.7s TimeCoverageRelationStatistics Valid=58, Invalid=284, Unknown=0, NotChecked=0, Total=342 [2023-11-25 00:05:56,148 INFO L413 NwaCegarLoop]: 19 mSDtfsCounter, 14 mSDsluCounter, 80 mSDsCounter, 0 mSdLazyCounter, 88 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 18 SdHoareTripleChecker+Valid, 99 SdHoareTripleChecker+Invalid, 93 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 88 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-25 00:05:56,149 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [18 Valid, 99 Invalid, 93 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 88 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-25 00:05:56,152 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2023-11-25 00:05:56,174 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 31. [2023-11-25 00:05:56,174 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 31 states, 21 states have (on average 1.1904761904761905) internal successors, (25), 23 states have internal predecessors, (25), 6 states have call successors, (6), 3 states have call predecessors, (6), 3 states have return successors, (5), 4 states have call predecessors, (5), 5 states have call successors, (5) [2023-11-25 00:05:56,176 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 36 transitions. [2023-11-25 00:05:56,176 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 36 transitions. Word has length 14 [2023-11-25 00:05:56,176 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-25 00:05:56,177 INFO L495 AbstractCegarLoop]: Abstraction has 31 states and 36 transitions. [2023-11-25 00:05:56,177 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 2.111111111111111) internal successors, (19), 8 states have internal predecessors, (19), 5 states have call successors, (5), 3 states have call predecessors, (5), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-11-25 00:05:56,177 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 36 transitions. [2023-11-25 00:05:56,179 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2023-11-25 00:05:56,179 INFO L187 NwaCegarLoop]: Found error trace [2023-11-25 00:05:56,179 INFO L195 NwaCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1] [2023-11-25 00:05:56,186 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9a582613-7e16-4d29-b94d-3303f9d128de/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Ended with exit code 0 [2023-11-25 00:05:56,385 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9a582613-7e16-4d29-b94d-3303f9d128de/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable3 [2023-11-25 00:05:56,386 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-25 00:05:56,386 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-25 00:05:56,386 INFO L85 PathProgramCache]: Analyzing trace with hash 1395635015, now seen corresponding path program 2 times [2023-11-25 00:05:56,387 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-25 00:05:56,387 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [9480723] [2023-11-25 00:05:56,387 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-25 00:05:56,387 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-25 00:05:56,426 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-25 00:05:56,583 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 4 proven. 5 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-11-25 00:05:56,584 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-25 00:05:56,584 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [9480723] [2023-11-25 00:05:56,587 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [9480723] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-25 00:05:56,587 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1036012145] [2023-11-25 00:05:56,587 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-25 00:05:56,588 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-25 00:05:56,588 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9a582613-7e16-4d29-b94d-3303f9d128de/bin/utaipan-verify-SwPr7d2a91/z3 [2023-11-25 00:05:56,589 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9a582613-7e16-4d29-b94d-3303f9d128de/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-25 00:05:56,615 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9a582613-7e16-4d29-b94d-3303f9d128de/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-11-25 00:05:56,666 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2023-11-25 00:05:56,666 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-25 00:05:56,669 INFO L262 TraceCheckSpWp]: Trace formula consists of 72 conjuncts, 13 conjunts are in the unsatisfiable core [2023-11-25 00:05:56,671 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-25 00:05:56,697 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 4 proven. 5 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-11-25 00:05:56,697 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-25 00:05:56,886 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 4 proven. 5 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-11-25 00:05:56,887 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1036012145] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-25 00:05:56,887 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1276193815] [2023-11-25 00:05:56,890 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2023-11-25 00:05:56,890 INFO L166 IcfgInterpreter]: Building call graph [2023-11-25 00:05:56,891 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-25 00:05:56,891 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-25 00:05:56,892 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-25 00:05:57,623 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 83 for LOIs [2023-11-25 00:05:58,104 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-25 00:06:02,568 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '595#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (exists ((|v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_27| Int) (|v_ULTIMATE.start_main_~x~0#1_BEFORE_CALL_19| Int) (|v_ULTIMATE.start_main_~w~0#1_BEFORE_CALL_19| Int)) (and (<= 268435455 (mod |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_27| 4294967296)) (<= 1 |#StackHeapBarrier|) (<= 1 |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_27|) (= |v_ULTIMATE.start_main_~x~0#1_BEFORE_CALL_19| 0) (= (mod |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_27| 2) 0) (= |v_ULTIMATE.start_main_~w~0#1_BEFORE_CALL_19| 0))))' at error location [2023-11-25 00:06:02,568 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-25 00:06:02,569 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-25 00:06:02,569 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 8] total 12 [2023-11-25 00:06:02,569 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1314004398] [2023-11-25 00:06:02,569 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-25 00:06:02,570 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2023-11-25 00:06:02,570 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-25 00:06:02,571 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2023-11-25 00:06:02,571 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=77, Invalid=343, Unknown=0, NotChecked=0, Total=420 [2023-11-25 00:06:02,571 INFO L87 Difference]: Start difference. First operand 31 states and 36 transitions. Second operand has 12 states, 11 states have (on average 2.090909090909091) internal successors, (23), 11 states have internal predecessors, (23), 6 states have call successors, (6), 3 states have call predecessors, (6), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2023-11-25 00:06:02,865 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-25 00:06:02,866 INFO L93 Difference]: Finished difference Result 78 states and 97 transitions. [2023-11-25 00:06:02,867 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2023-11-25 00:06:02,868 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 11 states have (on average 2.090909090909091) internal successors, (23), 11 states have internal predecessors, (23), 6 states have call successors, (6), 3 states have call predecessors, (6), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) Word has length 21 [2023-11-25 00:06:02,868 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-25 00:06:02,870 INFO L225 Difference]: With dead ends: 78 [2023-11-25 00:06:02,870 INFO L226 Difference]: Without dead ends: 47 [2023-11-25 00:06:02,872 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 70 GetRequests, 48 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 121 ImplicationChecksByTransitivity, 4.7s TimeCoverageRelationStatistics Valid=100, Invalid=452, Unknown=0, NotChecked=0, Total=552 [2023-11-25 00:06:02,873 INFO L413 NwaCegarLoop]: 17 mSDtfsCounter, 16 mSDsluCounter, 82 mSDsCounter, 0 mSdLazyCounter, 99 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 18 SdHoareTripleChecker+Valid, 99 SdHoareTripleChecker+Invalid, 109 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 99 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-25 00:06:02,874 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [18 Valid, 99 Invalid, 109 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 99 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-25 00:06:02,875 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 47 states. [2023-11-25 00:06:02,884 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 47 to 28. [2023-11-25 00:06:02,884 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28 states, 20 states have (on average 1.1) internal successors, (22), 20 states have internal predecessors, (22), 5 states have call successors, (5), 3 states have call predecessors, (5), 2 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2023-11-25 00:06:02,885 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 31 transitions. [2023-11-25 00:06:02,886 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 31 transitions. Word has length 21 [2023-11-25 00:06:02,886 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-25 00:06:02,886 INFO L495 AbstractCegarLoop]: Abstraction has 28 states and 31 transitions. [2023-11-25 00:06:02,886 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 11 states have (on average 2.090909090909091) internal successors, (23), 11 states have internal predecessors, (23), 6 states have call successors, (6), 3 states have call predecessors, (6), 1 states have return successors, (4), 4 states have call predecessors, (4), 4 states have call successors, (4) [2023-11-25 00:06:02,887 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 31 transitions. [2023-11-25 00:06:02,888 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 36 [2023-11-25 00:06:02,888 INFO L187 NwaCegarLoop]: Found error trace [2023-11-25 00:06:02,888 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 4, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-25 00:06:02,900 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9a582613-7e16-4d29-b94d-3303f9d128de/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2023-11-25 00:06:03,093 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9a582613-7e16-4d29-b94d-3303f9d128de/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-25 00:06:03,094 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-25 00:06:03,094 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-25 00:06:03,094 INFO L85 PathProgramCache]: Analyzing trace with hash -1221652332, now seen corresponding path program 1 times [2023-11-25 00:06:03,094 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-25 00:06:03,094 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [774868967] [2023-11-25 00:06:03,095 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-25 00:06:03,095 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-25 00:06:03,129 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-25 00:06:03,290 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 9 proven. 12 refuted. 0 times theorem prover too weak. 24 trivial. 0 not checked. [2023-11-25 00:06:03,290 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-25 00:06:03,291 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [774868967] [2023-11-25 00:06:03,291 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [774868967] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-25 00:06:03,291 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1862515890] [2023-11-25 00:06:03,291 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-25 00:06:03,291 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-25 00:06:03,292 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9a582613-7e16-4d29-b94d-3303f9d128de/bin/utaipan-verify-SwPr7d2a91/z3 [2023-11-25 00:06:03,293 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9a582613-7e16-4d29-b94d-3303f9d128de/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-25 00:06:03,300 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9a582613-7e16-4d29-b94d-3303f9d128de/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-11-25 00:06:03,359 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-25 00:06:03,361 INFO L262 TraceCheckSpWp]: Trace formula consists of 99 conjuncts, 10 conjunts are in the unsatisfiable core [2023-11-25 00:06:03,364 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-25 00:06:03,440 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 8 proven. 10 refuted. 0 times theorem prover too weak. 27 trivial. 0 not checked. [2023-11-25 00:06:03,440 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-25 00:06:03,595 INFO L134 CoverageAnalysis]: Checked inductivity of 45 backedges. 16 proven. 2 refuted. 0 times theorem prover too weak. 27 trivial. 0 not checked. [2023-11-25 00:06:03,596 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1862515890] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-25 00:06:03,596 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1943368646] [2023-11-25 00:06:03,603 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-11-25 00:06:03,603 INFO L166 IcfgInterpreter]: Building call graph [2023-11-25 00:06:03,603 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-25 00:06:03,604 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-25 00:06:03,604 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-25 00:06:05,694 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 1 for LOIs [2023-11-25 00:06:05,700 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-25 00:06:05,913 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '988#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0))' at error location [2023-11-25 00:06:05,913 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-25 00:06:05,913 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-25 00:06:05,914 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 14 [2023-11-25 00:06:05,914 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [708169564] [2023-11-25 00:06:05,914 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-25 00:06:05,914 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2023-11-25 00:06:05,915 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-25 00:06:05,915 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2023-11-25 00:06:05,916 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=346, Unknown=0, NotChecked=0, Total=420 [2023-11-25 00:06:05,916 INFO L87 Difference]: Start difference. First operand 28 states and 31 transitions. Second operand has 14 states, 14 states have (on average 2.642857142857143) internal successors, (37), 14 states have internal predecessors, (37), 8 states have call successors, (11), 2 states have call predecessors, (11), 1 states have return successors, (10), 8 states have call predecessors, (10), 8 states have call successors, (10) [2023-11-25 00:06:06,462 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-25 00:06:06,463 INFO L93 Difference]: Finished difference Result 113 states and 149 transitions. [2023-11-25 00:06:06,464 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2023-11-25 00:06:06,464 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 2.642857142857143) internal successors, (37), 14 states have internal predecessors, (37), 8 states have call successors, (11), 2 states have call predecessors, (11), 1 states have return successors, (10), 8 states have call predecessors, (10), 8 states have call successors, (10) Word has length 35 [2023-11-25 00:06:06,464 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-25 00:06:06,466 INFO L225 Difference]: With dead ends: 113 [2023-11-25 00:06:06,466 INFO L226 Difference]: Without dead ends: 87 [2023-11-25 00:06:06,467 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 126 GetRequests, 91 SyntacticMatches, 0 SemanticMatches, 35 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 319 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=262, Invalid=1070, Unknown=0, NotChecked=0, Total=1332 [2023-11-25 00:06:06,468 INFO L413 NwaCegarLoop]: 22 mSDtfsCounter, 42 mSDsluCounter, 88 mSDsCounter, 0 mSdLazyCounter, 150 mSolverCounterSat, 26 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 46 SdHoareTripleChecker+Valid, 110 SdHoareTripleChecker+Invalid, 176 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 26 IncrementalHoareTripleChecker+Valid, 150 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-25 00:06:06,468 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [46 Valid, 110 Invalid, 176 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [26 Valid, 150 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-25 00:06:06,469 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 87 states. [2023-11-25 00:06:06,496 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 87 to 79. [2023-11-25 00:06:06,496 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 79 states, 55 states have (on average 1.0909090909090908) internal successors, (60), 55 states have internal predecessors, (60), 21 states have call successors, (21), 3 states have call predecessors, (21), 2 states have return successors, (20), 20 states have call predecessors, (20), 20 states have call successors, (20) [2023-11-25 00:06:06,498 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 101 transitions. [2023-11-25 00:06:06,498 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 101 transitions. Word has length 35 [2023-11-25 00:06:06,498 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-25 00:06:06,498 INFO L495 AbstractCegarLoop]: Abstraction has 79 states and 101 transitions. [2023-11-25 00:06:06,499 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 2.642857142857143) internal successors, (37), 14 states have internal predecessors, (37), 8 states have call successors, (11), 2 states have call predecessors, (11), 1 states have return successors, (10), 8 states have call predecessors, (10), 8 states have call successors, (10) [2023-11-25 00:06:06,499 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 101 transitions. [2023-11-25 00:06:06,505 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 151 [2023-11-25 00:06:06,505 INFO L187 NwaCegarLoop]: Found error trace [2023-11-25 00:06:06,506 INFO L195 NwaCegarLoop]: trace histogram [21, 20, 20, 16, 16, 16, 16, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1] [2023-11-25 00:06:06,519 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9a582613-7e16-4d29-b94d-3303f9d128de/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2023-11-25 00:06:06,711 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9a582613-7e16-4d29-b94d-3303f9d128de/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2023-11-25 00:06:06,712 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-25 00:06:06,712 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-25 00:06:06,712 INFO L85 PathProgramCache]: Analyzing trace with hash 1930047857, now seen corresponding path program 2 times [2023-11-25 00:06:06,712 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-25 00:06:06,712 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2117476457] [2023-11-25 00:06:06,712 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-25 00:06:06,713 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-25 00:06:06,843 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-25 00:06:07,271 INFO L134 CoverageAnalysis]: Checked inductivity of 1252 backedges. 215 proven. 22 refuted. 0 times theorem prover too weak. 1015 trivial. 0 not checked. [2023-11-25 00:06:07,271 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-25 00:06:07,272 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2117476457] [2023-11-25 00:06:07,272 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2117476457] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-25 00:06:07,272 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1466666582] [2023-11-25 00:06:07,272 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-25 00:06:07,272 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-25 00:06:07,273 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9a582613-7e16-4d29-b94d-3303f9d128de/bin/utaipan-verify-SwPr7d2a91/z3 [2023-11-25 00:06:07,274 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9a582613-7e16-4d29-b94d-3303f9d128de/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-25 00:06:07,299 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9a582613-7e16-4d29-b94d-3303f9d128de/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-11-25 00:06:07,589 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2023-11-25 00:06:07,590 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-25 00:06:07,592 INFO L262 TraceCheckSpWp]: Trace formula consists of 132 conjuncts, 14 conjunts are in the unsatisfiable core [2023-11-25 00:06:07,596 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-25 00:06:07,641 INFO L134 CoverageAnalysis]: Checked inductivity of 1252 backedges. 295 proven. 22 refuted. 0 times theorem prover too weak. 935 trivial. 0 not checked. [2023-11-25 00:06:07,641 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-25 00:06:07,980 INFO L134 CoverageAnalysis]: Checked inductivity of 1252 backedges. 221 proven. 22 refuted. 0 times theorem prover too weak. 1009 trivial. 0 not checked. [2023-11-25 00:06:07,980 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1466666582] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-25 00:06:07,980 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2139056585] [2023-11-25 00:06:07,983 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-11-25 00:06:07,983 INFO L166 IcfgInterpreter]: Building call graph [2023-11-25 00:06:07,984 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-25 00:06:07,984 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-25 00:06:07,984 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-25 00:06:09,699 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 1 for LOIs [2023-11-25 00:06:09,710 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-25 00:06:09,963 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2242#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0))' at error location [2023-11-25 00:06:09,963 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-25 00:06:09,963 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-25 00:06:09,964 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 8] total 14 [2023-11-25 00:06:09,964 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [374757227] [2023-11-25 00:06:09,964 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-25 00:06:09,965 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2023-11-25 00:06:09,965 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-25 00:06:09,966 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2023-11-25 00:06:09,967 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=95, Invalid=325, Unknown=0, NotChecked=0, Total=420 [2023-11-25 00:06:09,967 INFO L87 Difference]: Start difference. First operand 79 states and 101 transitions. Second operand has 14 states, 14 states have (on average 3.0) internal successors, (42), 14 states have internal predecessors, (42), 10 states have call successors, (14), 2 states have call predecessors, (14), 2 states have return successors, (13), 10 states have call predecessors, (13), 10 states have call successors, (13) [2023-11-25 00:06:10,847 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-25 00:06:10,847 INFO L93 Difference]: Finished difference Result 215 states and 302 transitions. [2023-11-25 00:06:10,848 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2023-11-25 00:06:10,849 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 3.0) internal successors, (42), 14 states have internal predecessors, (42), 10 states have call successors, (14), 2 states have call predecessors, (14), 2 states have return successors, (13), 10 states have call predecessors, (13), 10 states have call successors, (13) Word has length 150 [2023-11-25 00:06:10,849 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-25 00:06:10,851 INFO L225 Difference]: With dead ends: 215 [2023-11-25 00:06:10,851 INFO L226 Difference]: Without dead ends: 151 [2023-11-25 00:06:10,852 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 462 GetRequests, 438 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 122 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=166, Invalid=484, Unknown=0, NotChecked=0, Total=650 [2023-11-25 00:06:10,853 INFO L413 NwaCegarLoop]: 20 mSDtfsCounter, 16 mSDsluCounter, 74 mSDsCounter, 0 mSdLazyCounter, 104 mSolverCounterSat, 23 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 18 SdHoareTripleChecker+Valid, 94 SdHoareTripleChecker+Invalid, 127 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 23 IncrementalHoareTripleChecker+Valid, 104 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-11-25 00:06:10,854 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [18 Valid, 94 Invalid, 127 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [23 Valid, 104 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2023-11-25 00:06:10,855 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 151 states. [2023-11-25 00:06:10,917 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 151 to 151. [2023-11-25 00:06:10,918 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 151 states, 103 states have (on average 1.0485436893203883) internal successors, (108), 103 states have internal predecessors, (108), 45 states have call successors, (45), 3 states have call predecessors, (45), 2 states have return successors, (44), 44 states have call predecessors, (44), 44 states have call successors, (44) [2023-11-25 00:06:10,921 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 151 states to 151 states and 197 transitions. [2023-11-25 00:06:10,921 INFO L78 Accepts]: Start accepts. Automaton has 151 states and 197 transitions. Word has length 150 [2023-11-25 00:06:10,922 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-25 00:06:10,922 INFO L495 AbstractCegarLoop]: Abstraction has 151 states and 197 transitions. [2023-11-25 00:06:10,923 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 3.0) internal successors, (42), 14 states have internal predecessors, (42), 10 states have call successors, (14), 2 states have call predecessors, (14), 2 states have return successors, (13), 10 states have call predecessors, (13), 10 states have call successors, (13) [2023-11-25 00:06:10,923 INFO L276 IsEmpty]: Start isEmpty. Operand 151 states and 197 transitions. [2023-11-25 00:06:10,931 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 319 [2023-11-25 00:06:10,931 INFO L187 NwaCegarLoop]: Found error trace [2023-11-25 00:06:10,932 INFO L195 NwaCegarLoop]: trace histogram [45, 44, 44, 40, 40, 40, 40, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1] [2023-11-25 00:06:10,943 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9a582613-7e16-4d29-b94d-3303f9d128de/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2023-11-25 00:06:11,143 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9a582613-7e16-4d29-b94d-3303f9d128de/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2023-11-25 00:06:11,143 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-25 00:06:11,144 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-25 00:06:11,144 INFO L85 PathProgramCache]: Analyzing trace with hash -1373710095, now seen corresponding path program 3 times [2023-11-25 00:06:11,144 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-25 00:06:11,144 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1276155303] [2023-11-25 00:06:11,144 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-25 00:06:11,145 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-25 00:06:11,338 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-25 00:06:12,458 INFO L134 CoverageAnalysis]: Checked inductivity of 6400 backedges. 1055 proven. 145 refuted. 0 times theorem prover too weak. 5200 trivial. 0 not checked. [2023-11-25 00:06:12,458 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-25 00:06:12,459 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1276155303] [2023-11-25 00:06:12,464 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1276155303] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-25 00:06:12,464 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1943194830] [2023-11-25 00:06:12,464 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-11-25 00:06:12,464 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-25 00:06:12,465 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9a582613-7e16-4d29-b94d-3303f9d128de/bin/utaipan-verify-SwPr7d2a91/z3 [2023-11-25 00:06:12,476 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9a582613-7e16-4d29-b94d-3303f9d128de/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-25 00:06:12,527 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9a582613-7e16-4d29-b94d-3303f9d128de/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-11-25 00:06:12,783 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-11-25 00:06:12,783 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-25 00:06:12,788 INFO L262 TraceCheckSpWp]: Trace formula consists of 699 conjuncts, 22 conjunts are in the unsatisfiable core [2023-11-25 00:06:12,809 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-25 00:06:13,276 INFO L134 CoverageAnalysis]: Checked inductivity of 6400 backedges. 88 proven. 2048 refuted. 0 times theorem prover too weak. 4264 trivial. 0 not checked. [2023-11-25 00:06:13,276 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-25 00:06:14,142 INFO L134 CoverageAnalysis]: Checked inductivity of 6400 backedges. 166 proven. 1970 refuted. 0 times theorem prover too weak. 4264 trivial. 0 not checked. [2023-11-25 00:06:14,143 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1943194830] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-25 00:06:14,143 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2070223714] [2023-11-25 00:06:14,145 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-11-25 00:06:14,145 INFO L166 IcfgInterpreter]: Building call graph [2023-11-25 00:06:14,146 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-25 00:06:14,146 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-25 00:06:14,146 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-25 00:06:15,409 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 1 for LOIs [2023-11-25 00:06:15,412 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-25 00:06:15,727 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4794#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0))' at error location [2023-11-25 00:06:15,727 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-25 00:06:15,727 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-25 00:06:15,728 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12, 12] total 33 [2023-11-25 00:06:15,728 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2102945048] [2023-11-25 00:06:15,728 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-25 00:06:15,729 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 33 states [2023-11-25 00:06:15,730 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-25 00:06:15,731 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 33 interpolants. [2023-11-25 00:06:15,732 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=215, Invalid=1345, Unknown=0, NotChecked=0, Total=1560 [2023-11-25 00:06:15,732 INFO L87 Difference]: Start difference. First operand 151 states and 197 transitions. Second operand has 33 states, 33 states have (on average 2.9393939393939394) internal successors, (97), 33 states have internal predecessors, (97), 27 states have call successors, (37), 2 states have call predecessors, (37), 1 states have return successors, (36), 27 states have call predecessors, (36), 27 states have call successors, (36) [2023-11-25 00:06:26,252 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-25 00:06:26,253 INFO L93 Difference]: Finished difference Result 523 states and 712 transitions. [2023-11-25 00:06:26,254 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 126 states. [2023-11-25 00:06:26,254 INFO L78 Accepts]: Start accepts. Automaton has has 33 states, 33 states have (on average 2.9393939393939394) internal successors, (97), 33 states have internal predecessors, (97), 27 states have call successors, (37), 2 states have call predecessors, (37), 1 states have return successors, (36), 27 states have call predecessors, (36), 27 states have call successors, (36) Word has length 318 [2023-11-25 00:06:26,255 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-25 00:06:26,259 INFO L225 Difference]: With dead ends: 523 [2023-11-25 00:06:26,260 INFO L226 Difference]: Without dead ends: 405 [2023-11-25 00:06:26,275 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1079 GetRequests, 928 SyntacticMatches, 0 SemanticMatches, 151 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8127 ImplicationChecksByTransitivity, 8.9s TimeCoverageRelationStatistics Valid=2935, Invalid=20321, Unknown=0, NotChecked=0, Total=23256 [2023-11-25 00:06:26,277 INFO L413 NwaCegarLoop]: 116 mSDtfsCounter, 173 mSDsluCounter, 884 mSDsCounter, 0 mSdLazyCounter, 2645 mSolverCounterSat, 99 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 177 SdHoareTripleChecker+Valid, 1000 SdHoareTripleChecker+Invalid, 2744 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 99 IncrementalHoareTripleChecker+Valid, 2645 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.2s IncrementalHoareTripleChecker+Time [2023-11-25 00:06:26,277 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [177 Valid, 1000 Invalid, 2744 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [99 Valid, 2645 Invalid, 0 Unknown, 0 Unchecked, 2.2s Time] [2023-11-25 00:06:26,278 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 405 states. [2023-11-25 00:06:26,424 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 405 to 385. [2023-11-25 00:06:26,425 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 385 states, 261 states have (on average 1.0421455938697317) internal successors, (272), 261 states have internal predecessors, (272), 121 states have call successors, (121), 3 states have call predecessors, (121), 2 states have return successors, (120), 120 states have call predecessors, (120), 120 states have call successors, (120) [2023-11-25 00:06:26,434 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 385 states to 385 states and 513 transitions. [2023-11-25 00:06:26,434 INFO L78 Accepts]: Start accepts. Automaton has 385 states and 513 transitions. Word has length 318 [2023-11-25 00:06:26,434 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-25 00:06:26,435 INFO L495 AbstractCegarLoop]: Abstraction has 385 states and 513 transitions. [2023-11-25 00:06:26,435 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 33 states, 33 states have (on average 2.9393939393939394) internal successors, (97), 33 states have internal predecessors, (97), 27 states have call successors, (37), 2 states have call predecessors, (37), 1 states have return successors, (36), 27 states have call predecessors, (36), 27 states have call successors, (36) [2023-11-25 00:06:26,435 INFO L276 IsEmpty]: Start isEmpty. Operand 385 states and 513 transitions. [2023-11-25 00:06:26,471 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 857 [2023-11-25 00:06:26,471 INFO L187 NwaCegarLoop]: Found error trace [2023-11-25 00:06:26,472 INFO L195 NwaCegarLoop]: trace histogram [121, 120, 120, 110, 110, 110, 110, 10, 10, 10, 10, 10, 1, 1, 1, 1, 1] [2023-11-25 00:06:26,479 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9a582613-7e16-4d29-b94d-3303f9d128de/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2023-11-25 00:06:26,679 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9a582613-7e16-4d29-b94d-3303f9d128de/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable7 [2023-11-25 00:06:26,679 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-25 00:06:26,680 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-25 00:06:26,680 INFO L85 PathProgramCache]: Analyzing trace with hash 553580381, now seen corresponding path program 4 times [2023-11-25 00:06:26,680 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-25 00:06:26,680 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1629551343] [2023-11-25 00:06:26,680 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-25 00:06:26,680 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-25 00:06:27,912 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-25 00:06:30,471 INFO L134 CoverageAnalysis]: Checked inductivity of 48075 backedges. 3724 proven. 176 refuted. 0 times theorem prover too weak. 44175 trivial. 0 not checked. [2023-11-25 00:06:30,471 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-25 00:06:30,472 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1629551343] [2023-11-25 00:06:30,472 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1629551343] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-25 00:06:30,472 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2133924830] [2023-11-25 00:06:30,472 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-11-25 00:06:30,472 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-25 00:06:30,473 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9a582613-7e16-4d29-b94d-3303f9d128de/bin/utaipan-verify-SwPr7d2a91/z3 [2023-11-25 00:06:30,474 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9a582613-7e16-4d29-b94d-3303f9d128de/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-25 00:06:30,480 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_9a582613-7e16-4d29-b94d-3303f9d128de/bin/utaipan-verify-SwPr7d2a91/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2023-11-25 00:06:30,997 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-25 00:06:31,009 INFO L262 TraceCheckSpWp]: Trace formula consists of 1839 conjuncts, 46 conjunts are in the unsatisfiable core [2023-11-25 00:06:31,036 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-25 00:06:32,199 INFO L134 CoverageAnalysis]: Checked inductivity of 48075 backedges. 240 proven. 17691 refuted. 0 times theorem prover too weak. 30144 trivial. 0 not checked. [2023-11-25 00:06:32,199 INFO L327 TraceCheckSpWp]: Computing backward predicates...