./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/loops-crafted-1/nested3-1.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 9bd2c7ff 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_aebbd7bd-892e-42d2-b5e7-56006e80864e/bin/utaipan-verify-t7M7D8N6sZ/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aebbd7bd-892e-42d2-b5e7-56006e80864e/bin/utaipan-verify-t7M7D8N6sZ/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aebbd7bd-892e-42d2-b5e7-56006e80864e/bin/utaipan-verify-t7M7D8N6sZ/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aebbd7bd-892e-42d2-b5e7-56006e80864e/bin/utaipan-verify-t7M7D8N6sZ/config/TaipanReach.xml -i ../../sv-benchmarks/c/loops-crafted-1/nested3-1.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aebbd7bd-892e-42d2-b5e7-56006e80864e/bin/utaipan-verify-t7M7D8N6sZ/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aebbd7bd-892e-42d2-b5e7-56006e80864e/bin/utaipan-verify-t7M7D8N6sZ --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 ed8e064f31e82b4c33cb383334d25637eef982ae8d5b8603579b97c7fdfe808e --- Real Ultimate output --- This is Ultimate 0.2.3-dev-9bd2c7f [2023-11-19 05:11:21,655 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-11-19 05:11:21,833 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aebbd7bd-892e-42d2-b5e7-56006e80864e/bin/utaipan-verify-t7M7D8N6sZ/config/svcomp-Reach-32bit-Taipan_Default.epf [2023-11-19 05:11:21,852 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-11-19 05:11:21,853 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-11-19 05:11:21,911 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-11-19 05:11:21,912 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-11-19 05:11:21,913 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-11-19 05:11:21,915 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-11-19 05:11:21,922 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-11-19 05:11:21,923 INFO L153 SettingsManager]: * User list type=DISABLED [2023-11-19 05:11:21,924 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-11-19 05:11:21,924 INFO L153 SettingsManager]: * Explicit value domain=true [2023-11-19 05:11:21,927 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-11-19 05:11:21,928 INFO L153 SettingsManager]: * Octagon Domain=false [2023-11-19 05:11:21,928 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-11-19 05:11:21,929 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-11-19 05:11:21,929 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-11-19 05:11:21,930 INFO L153 SettingsManager]: * Interval Domain=false [2023-11-19 05:11:21,931 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-11-19 05:11:21,932 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-11-19 05:11:21,933 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2023-11-19 05:11:21,934 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-11-19 05:11:21,935 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-11-19 05:11:21,936 INFO L153 SettingsManager]: * sizeof long=4 [2023-11-19 05:11:21,937 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-11-19 05:11:21,937 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-11-19 05:11:21,938 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-11-19 05:11:21,939 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-11-19 05:11:21,939 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-11-19 05:11:21,941 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-11-19 05:11:21,942 INFO L153 SettingsManager]: * sizeof long double=12 [2023-11-19 05:11:21,942 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2023-11-19 05:11:21,942 INFO L153 SettingsManager]: * Use constant arrays=true [2023-11-19 05:11:21,943 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-11-19 05:11:21,943 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-11-19 05:11:21,944 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-19 05:11:21,944 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-11-19 05:11:21,944 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-11-19 05:11:21,945 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2023-11-19 05:11:21,945 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-11-19 05:11:21,946 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-11-19 05:11:21,946 INFO L153 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-11-19 05:11:21,947 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-11-19 05:11:21,948 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-11-19 05:11:21,948 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_aebbd7bd-892e-42d2-b5e7-56006e80864e/bin/utaipan-verify-t7M7D8N6sZ/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aebbd7bd-892e-42d2-b5e7-56006e80864e/bin/utaipan-verify-t7M7D8N6sZ Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> ed8e064f31e82b4c33cb383334d25637eef982ae8d5b8603579b97c7fdfe808e [2023-11-19 05:11:22,342 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-11-19 05:11:22,397 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-11-19 05:11:22,403 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-11-19 05:11:22,405 INFO L270 PluginConnector]: Initializing CDTParser... [2023-11-19 05:11:22,406 INFO L274 PluginConnector]: CDTParser initialized [2023-11-19 05:11:22,410 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aebbd7bd-892e-42d2-b5e7-56006e80864e/bin/utaipan-verify-t7M7D8N6sZ/../../sv-benchmarks/c/loops-crafted-1/nested3-1.c [2023-11-19 05:11:26,321 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-11-19 05:11:26,515 INFO L384 CDTParser]: Found 1 translation units. [2023-11-19 05:11:26,516 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aebbd7bd-892e-42d2-b5e7-56006e80864e/sv-benchmarks/c/loops-crafted-1/nested3-1.c [2023-11-19 05:11:26,524 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aebbd7bd-892e-42d2-b5e7-56006e80864e/bin/utaipan-verify-t7M7D8N6sZ/data/e683169ac/ae634d4d940447448dce378162898539/FLAG7750d200f [2023-11-19 05:11:26,541 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aebbd7bd-892e-42d2-b5e7-56006e80864e/bin/utaipan-verify-t7M7D8N6sZ/data/e683169ac/ae634d4d940447448dce378162898539 [2023-11-19 05:11:26,543 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-11-19 05:11:26,545 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-11-19 05:11:26,547 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-11-19 05:11:26,547 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-11-19 05:11:26,555 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-11-19 05:11:26,556 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.11 05:11:26" (1/1) ... [2023-11-19 05:11:26,557 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3aa0bf54 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:11:26, skipping insertion in model container [2023-11-19 05:11:26,558 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.11 05:11:26" (1/1) ... [2023-11-19 05:11:26,583 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-11-19 05:11:26,726 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_aebbd7bd-892e-42d2-b5e7-56006e80864e/sv-benchmarks/c/loops-crafted-1/nested3-1.c[321,334] [2023-11-19 05:11:26,743 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-19 05:11:26,754 INFO L202 MainTranslator]: Completed pre-run [2023-11-19 05:11:26,765 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_aebbd7bd-892e-42d2-b5e7-56006e80864e/sv-benchmarks/c/loops-crafted-1/nested3-1.c[321,334] [2023-11-19 05:11:26,771 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-19 05:11:26,784 INFO L206 MainTranslator]: Completed translation [2023-11-19 05:11:26,784 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:11:26 WrapperNode [2023-11-19 05:11:26,784 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-11-19 05:11:26,786 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-11-19 05:11:26,786 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-11-19 05:11:26,786 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-11-19 05:11:26,795 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:11:26" (1/1) ... [2023-11-19 05:11:26,805 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:11:26" (1/1) ... [2023-11-19 05:11:26,823 INFO L138 Inliner]: procedures = 12, calls = 10, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 41 [2023-11-19 05:11:26,823 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-11-19 05:11:26,824 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-11-19 05:11:26,824 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-11-19 05:11:26,825 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-11-19 05:11:26,835 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:11:26" (1/1) ... [2023-11-19 05:11:26,835 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:11:26" (1/1) ... [2023-11-19 05:11:26,837 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:11:26" (1/1) ... [2023-11-19 05:11:26,837 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:11:26" (1/1) ... [2023-11-19 05:11:26,841 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:11:26" (1/1) ... [2023-11-19 05:11:26,846 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:11:26" (1/1) ... [2023-11-19 05:11:26,847 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:11:26" (1/1) ... [2023-11-19 05:11:26,848 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:11:26" (1/1) ... [2023-11-19 05:11:26,851 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-11-19 05:11:26,853 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-11-19 05:11:26,859 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-11-19 05:11:26,860 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-11-19 05:11:26,861 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:11:26" (1/1) ... [2023-11-19 05:11:26,867 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-19 05:11:26,885 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aebbd7bd-892e-42d2-b5e7-56006e80864e/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 05:11:26,901 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aebbd7bd-892e-42d2-b5e7-56006e80864e/bin/utaipan-verify-t7M7D8N6sZ/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-11-19 05:11:26,921 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aebbd7bd-892e-42d2-b5e7-56006e80864e/bin/utaipan-verify-t7M7D8N6sZ/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-11-19 05:11:26,948 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-11-19 05:11:26,949 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-11-19 05:11:26,949 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-11-19 05:11:26,949 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-11-19 05:11:26,949 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2023-11-19 05:11:26,950 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2023-11-19 05:11:27,027 INFO L236 CfgBuilder]: Building ICFG [2023-11-19 05:11:27,030 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2023-11-19 05:11:27,206 INFO L277 CfgBuilder]: Performing block encoding [2023-11-19 05:11:27,243 INFO L297 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-11-19 05:11:27,243 INFO L302 CfgBuilder]: Removed 3 assume(true) statements. [2023-11-19 05:11:27,249 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.11 05:11:27 BoogieIcfgContainer [2023-11-19 05:11:27,249 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-11-19 05:11:27,253 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-11-19 05:11:27,253 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-11-19 05:11:27,257 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-11-19 05:11:27,257 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 19.11 05:11:26" (1/3) ... [2023-11-19 05:11:27,259 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@39eb55bb and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.11 05:11:27, skipping insertion in model container [2023-11-19 05:11:27,259 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:11:26" (2/3) ... [2023-11-19 05:11:27,259 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@39eb55bb and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.11 05:11:27, skipping insertion in model container [2023-11-19 05:11:27,260 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.11 05:11:27" (3/3) ... [2023-11-19 05:11:27,261 INFO L112 eAbstractionObserver]: Analyzing ICFG nested3-1.c [2023-11-19 05:11:27,287 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-11-19 05:11:27,287 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-11-19 05:11:27,349 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-11-19 05:11:27,356 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;@4caba070, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-11-19 05:11:27,357 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-11-19 05:11:27,361 INFO L276 IsEmpty]: Start isEmpty. Operand has 17 states, 11 states have (on average 1.4545454545454546) internal successors, (16), 12 states have internal predecessors, (16), 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) [2023-11-19 05:11:27,369 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2023-11-19 05:11:27,370 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:11:27,371 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2023-11-19 05:11:27,372 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 05:11:27,378 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:11:27,379 INFO L85 PathProgramCache]: Analyzing trace with hash -1453215626, now seen corresponding path program 1 times [2023-11-19 05:11:27,389 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:11:27,390 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [389939761] [2023-11-19 05:11:27,390 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:11:27,390 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:11:27,551 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:11:27,795 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 05:11:27,796 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:11:27,797 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [389939761] [2023-11-19 05:11:27,798 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [389939761] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-19 05:11:27,798 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-19 05:11:27,799 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-11-19 05:11:27,801 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1396806759] [2023-11-19 05:11:27,802 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 05:11:27,807 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-19 05:11:27,808 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:11:27,839 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-19 05:11:27,840 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-19 05:11:27,842 INFO L87 Difference]: Start difference. First operand has 17 states, 11 states have (on average 1.4545454545454546) internal successors, (16), 12 states have internal predecessors, (16), 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) [2023-11-19 05:11:27,900 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:11:27,900 INFO L93 Difference]: Finished difference Result 40 states and 60 transitions. [2023-11-19 05:11:27,929 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-19 05:11:27,931 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 [2023-11-19 05:11:27,931 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:11:27,940 INFO L225 Difference]: With dead ends: 40 [2023-11-19 05:11:27,941 INFO L226 Difference]: Without dead ends: 22 [2023-11-19 05:11:27,947 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 [2023-11-19 05:11:27,957 INFO L413 NwaCegarLoop]: 14 mSDtfsCounter, 6 mSDsluCounter, 14 mSDsCounter, 0 mSdLazyCounter, 13 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8 SdHoareTripleChecker+Valid, 28 SdHoareTripleChecker+Invalid, 13 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 13 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-19 05:11:27,958 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [8 Valid, 28 Invalid, 13 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 13 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-19 05:11:27,980 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2023-11-19 05:11:28,001 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 16. [2023-11-19 05:11:28,003 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 16 states, 11 states have (on average 1.3636363636363635) internal successors, (15), 12 states have internal predecessors, (15), 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) [2023-11-19 05:11:28,004 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 20 transitions. [2023-11-19 05:11:28,006 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 20 transitions. Word has length 6 [2023-11-19 05:11:28,006 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:11:28,007 INFO L495 AbstractCegarLoop]: Abstraction has 16 states and 20 transitions. [2023-11-19 05:11:28,007 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) [2023-11-19 05:11:28,007 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 20 transitions. [2023-11-19 05:11:28,008 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2023-11-19 05:11:28,008 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:11:28,009 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2023-11-19 05:11:28,009 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-11-19 05:11:28,010 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 05:11:28,011 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:11:28,011 INFO L85 PathProgramCache]: Analyzing trace with hash 569943281, now seen corresponding path program 1 times [2023-11-19 05:11:28,011 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:11:28,012 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1859858327] [2023-11-19 05:11:28,012 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:11:28,012 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:11:28,030 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:11:28,108 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 05:11:28,109 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:11:28,109 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1859858327] [2023-11-19 05:11:28,109 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1859858327] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-19 05:11:28,110 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-19 05:11:28,110 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-11-19 05:11:28,110 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1649482216] [2023-11-19 05:11:28,110 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 05:11:28,112 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-19 05:11:28,112 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:11:28,113 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-19 05:11:28,113 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-19 05:11:28,114 INFO L87 Difference]: Start difference. First operand 16 states and 20 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) [2023-11-19 05:11:28,149 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:11:28,150 INFO L93 Difference]: Finished difference Result 34 states and 45 transitions. [2023-11-19 05:11:28,150 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-19 05:11:28,151 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 [2023-11-19 05:11:28,151 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:11:28,152 INFO L225 Difference]: With dead ends: 34 [2023-11-19 05:11:28,152 INFO L226 Difference]: Without dead ends: 20 [2023-11-19 05:11:28,153 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 [2023-11-19 05:11:28,155 INFO L413 NwaCegarLoop]: 13 mSDtfsCounter, 3 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 11 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4 SdHoareTripleChecker+Valid, 25 SdHoareTripleChecker+Invalid, 12 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 11 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-19 05:11:28,156 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [4 Valid, 25 Invalid, 12 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 11 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-19 05:11:28,157 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2023-11-19 05:11:28,161 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 17. [2023-11-19 05:11:28,162 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17 states, 12 states have (on average 1.3333333333333333) internal successors, (16), 13 states have internal predecessors, (16), 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) [2023-11-19 05:11:28,163 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 21 transitions. [2023-11-19 05:11:28,163 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 21 transitions. Word has length 7 [2023-11-19 05:11:28,163 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:11:28,163 INFO L495 AbstractCegarLoop]: Abstraction has 17 states and 21 transitions. [2023-11-19 05:11:28,164 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) [2023-11-19 05:11:28,164 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 21 transitions. [2023-11-19 05:11:28,164 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2023-11-19 05:11:28,165 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:11:28,165 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 05:11:28,165 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2023-11-19 05:11:28,165 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 05:11:28,166 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:11:28,166 INFO L85 PathProgramCache]: Analyzing trace with hash -935372046, now seen corresponding path program 1 times [2023-11-19 05:11:28,167 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:11:28,167 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2092558011] [2023-11-19 05:11:28,167 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:11:28,167 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:11:28,181 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:11:28,259 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 05:11:28,259 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:11:28,260 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2092558011] [2023-11-19 05:11:28,260 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2092558011] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-19 05:11:28,260 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-19 05:11:28,261 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-11-19 05:11:28,261 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [720335048] [2023-11-19 05:11:28,261 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 05:11:28,262 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-19 05:11:28,262 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:11:28,263 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-19 05:11:28,263 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-19 05:11:28,263 INFO L87 Difference]: Start difference. First operand 17 states and 21 transitions. Second operand has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 3 states have internal predecessors, (7), 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) [2023-11-19 05:11:28,297 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:11:28,298 INFO L93 Difference]: Finished difference Result 34 states and 43 transitions. [2023-11-19 05:11:28,298 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-19 05:11:28,299 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 3 states have internal predecessors, (7), 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 8 [2023-11-19 05:11:28,299 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:11:28,300 INFO L225 Difference]: With dead ends: 34 [2023-11-19 05:11:28,300 INFO L226 Difference]: Without dead ends: 19 [2023-11-19 05:11:28,301 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 [2023-11-19 05:11:28,303 INFO L413 NwaCegarLoop]: 14 mSDtfsCounter, 1 mSDsluCounter, 13 mSDsCounter, 0 mSdLazyCounter, 9 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 27 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 [2023-11-19 05:11:28,304 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1 Valid, 27 Invalid, 10 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 9 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-19 05:11:28,305 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2023-11-19 05:11:28,312 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 18. [2023-11-19 05:11:28,313 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 18 states, 13 states have (on average 1.3076923076923077) internal successors, (17), 14 states have internal predecessors, (17), 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) [2023-11-19 05:11:28,314 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 22 transitions. [2023-11-19 05:11:28,314 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 22 transitions. Word has length 8 [2023-11-19 05:11:28,314 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:11:28,315 INFO L495 AbstractCegarLoop]: Abstraction has 18 states and 22 transitions. [2023-11-19 05:11:28,315 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 3 states have internal predecessors, (7), 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) [2023-11-19 05:11:28,315 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 22 transitions. [2023-11-19 05:11:28,316 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2023-11-19 05:11:28,316 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:11:28,316 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 05:11:28,317 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2023-11-19 05:11:28,317 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 05:11:28,318 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:11:28,318 INFO L85 PathProgramCache]: Analyzing trace with hash -67368375, now seen corresponding path program 1 times [2023-11-19 05:11:28,318 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:11:28,319 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1552323378] [2023-11-19 05:11:28,319 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:11:28,319 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:11:28,354 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:11:28,564 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 05:11:28,564 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:11:28,565 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1552323378] [2023-11-19 05:11:28,565 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1552323378] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 05:11:28,566 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1658960732] [2023-11-19 05:11:28,566 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:11:28,566 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:11:28,567 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aebbd7bd-892e-42d2-b5e7-56006e80864e/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 05:11:28,569 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aebbd7bd-892e-42d2-b5e7-56006e80864e/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 05:11:28,603 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aebbd7bd-892e-42d2-b5e7-56006e80864e/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-11-19 05:11:28,663 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:11:28,665 INFO L262 TraceCheckSpWp]: Trace formula consists of 48 conjuncts, 10 conjunts are in the unsatisfiable core [2023-11-19 05:11:28,671 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 05:11:28,776 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 05:11:28,776 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-19 05:11:28,908 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 05:11:28,908 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1658960732] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-19 05:11:28,909 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1127836982] [2023-11-19 05:11:28,935 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2023-11-19 05:11:28,935 INFO L166 IcfgInterpreter]: Building call graph [2023-11-19 05:11:28,940 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-19 05:11:28,947 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-19 05:11:28,948 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-19 05:11:29,264 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 17 for LOIs [2023-11-19 05:11:29,302 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-19 05:11:29,630 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '330#(and (<= 1 |#StackHeapBarrier|) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (exists ((|v_ULTIMATE.start_main_~z~0#1_BEFORE_CALL_2| Int)) (and (<= 0 |v_ULTIMATE.start_main_~z~0#1_BEFORE_CALL_2|) (<= 268435455 (mod |v_ULTIMATE.start_main_~z~0#1_BEFORE_CALL_2| 4294967296)) (= (mod |v_ULTIMATE.start_main_~z~0#1_BEFORE_CALL_2| 4) 0))))' at error location [2023-11-19 05:11:29,630 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-19 05:11:29,630 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-19 05:11:29,630 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 6, 6] total 11 [2023-11-19 05:11:29,631 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1630793829] [2023-11-19 05:11:29,631 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-19 05:11:29,633 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2023-11-19 05:11:29,634 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:11:29,637 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2023-11-19 05:11:29,641 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=47, Invalid=225, Unknown=0, NotChecked=0, Total=272 [2023-11-19 05:11:29,641 INFO L87 Difference]: Start difference. First operand 18 states and 22 transitions. Second operand has 11 states, 11 states have (on average 1.5454545454545454) internal successors, (17), 9 states have internal predecessors, (17), 3 states have call successors, (3), 3 states have call predecessors, (3), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 05:11:29,866 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:11:29,866 INFO L93 Difference]: Finished difference Result 58 states and 77 transitions. [2023-11-19 05:11:29,867 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2023-11-19 05:11:29,867 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 1.5454545454545454) internal successors, (17), 9 states have internal predecessors, (17), 3 states have call successors, (3), 3 states have call predecessors, (3), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 9 [2023-11-19 05:11:29,867 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:11:29,872 INFO L225 Difference]: With dead ends: 58 [2023-11-19 05:11:29,872 INFO L226 Difference]: Without dead ends: 42 [2023-11-19 05:11:29,876 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 33 GetRequests, 16 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 73 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=56, Invalid=286, Unknown=0, NotChecked=0, Total=342 [2023-11-19 05:11:29,880 INFO L413 NwaCegarLoop]: 13 mSDtfsCounter, 25 mSDsluCounter, 61 mSDsCounter, 0 mSdLazyCounter, 69 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 27 SdHoareTripleChecker+Valid, 74 SdHoareTripleChecker+Invalid, 78 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 69 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-19 05:11:29,883 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [27 Valid, 74 Invalid, 78 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 69 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-19 05:11:29,888 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2023-11-19 05:11:29,904 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 26. [2023-11-19 05:11:29,904 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 19 states have (on average 1.3157894736842106) internal successors, (25), 21 states have internal predecessors, (25), 4 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (3), 2 states have call predecessors, (3), 3 states have call successors, (3) [2023-11-19 05:11:29,909 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 32 transitions. [2023-11-19 05:11:29,910 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 32 transitions. Word has length 9 [2023-11-19 05:11:29,911 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:11:29,911 INFO L495 AbstractCegarLoop]: Abstraction has 26 states and 32 transitions. [2023-11-19 05:11:29,911 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 11 states have (on average 1.5454545454545454) internal successors, (17), 9 states have internal predecessors, (17), 3 states have call successors, (3), 3 states have call predecessors, (3), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 05:11:29,911 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 32 transitions. [2023-11-19 05:11:29,912 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2023-11-19 05:11:29,913 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:11:29,913 INFO L195 NwaCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 05:11:29,944 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aebbd7bd-892e-42d2-b5e7-56006e80864e/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-11-19 05:11:30,138 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aebbd7bd-892e-42d2-b5e7-56006e80864e/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:11:30,139 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 05:11:30,139 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:11:30,140 INFO L85 PathProgramCache]: Analyzing trace with hash 698087602, now seen corresponding path program 2 times [2023-11-19 05:11:30,140 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:11:30,140 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1039466302] [2023-11-19 05:11:30,140 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:11:30,140 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:11:30,153 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:11:30,317 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 05:11:30,317 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:11:30,318 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1039466302] [2023-11-19 05:11:30,320 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1039466302] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 05:11:30,321 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1124393610] [2023-11-19 05:11:30,322 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-19 05:11:30,322 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:11:30,322 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aebbd7bd-892e-42d2-b5e7-56006e80864e/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 05:11:30,323 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aebbd7bd-892e-42d2-b5e7-56006e80864e/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 05:11:30,339 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aebbd7bd-892e-42d2-b5e7-56006e80864e/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-11-19 05:11:30,380 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2023-11-19 05:11:30,380 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-19 05:11:30,381 INFO L262 TraceCheckSpWp]: Trace formula consists of 51 conjuncts, 10 conjunts are in the unsatisfiable core [2023-11-19 05:11:30,382 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 05:11:30,606 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-11-19 05:11:30,606 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-19 05:11:30,607 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1124393610] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-19 05:11:30,607 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-19 05:11:30,608 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [7] total 11 [2023-11-19 05:11:30,609 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1881863726] [2023-11-19 05:11:30,609 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 05:11:30,610 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-11-19 05:11:30,610 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:11:30,611 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-11-19 05:11:30,612 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2023-11-19 05:11:30,612 INFO L87 Difference]: Start difference. First operand 26 states and 32 transitions. Second operand has 6 states, 5 states have (on average 1.8) internal successors, (9), 5 states have internal predecessors, (9), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 05:11:30,747 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:11:30,747 INFO L93 Difference]: Finished difference Result 33 states and 38 transitions. [2023-11-19 05:11:30,747 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-11-19 05:11:30,748 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 5 states have (on average 1.8) internal successors, (9), 5 states have internal predecessors, (9), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 12 [2023-11-19 05:11:30,748 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:11:30,750 INFO L225 Difference]: With dead ends: 33 [2023-11-19 05:11:30,750 INFO L226 Difference]: Without dead ends: 31 [2023-11-19 05:11:30,750 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 20 GetRequests, 10 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=31, Invalid=101, Unknown=0, NotChecked=0, Total=132 [2023-11-19 05:11:30,751 INFO L413 NwaCegarLoop]: 14 mSDtfsCounter, 15 mSDsluCounter, 32 mSDsCounter, 0 mSdLazyCounter, 33 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 17 SdHoareTripleChecker+Valid, 46 SdHoareTripleChecker+Invalid, 35 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 33 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-19 05:11:30,752 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [17 Valid, 46 Invalid, 35 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 33 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-19 05:11:30,753 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2023-11-19 05:11:30,758 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 23. [2023-11-19 05:11:30,759 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23 states, 17 states have (on average 1.2352941176470589) internal successors, (21), 18 states have internal predecessors, (21), 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) [2023-11-19 05:11:30,760 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 26 transitions. [2023-11-19 05:11:30,760 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 26 transitions. Word has length 12 [2023-11-19 05:11:30,760 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:11:30,760 INFO L495 AbstractCegarLoop]: Abstraction has 23 states and 26 transitions. [2023-11-19 05:11:30,760 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 5 states have (on average 1.8) internal successors, (9), 5 states have internal predecessors, (9), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 05:11:30,761 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 26 transitions. [2023-11-19 05:11:30,761 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2023-11-19 05:11:30,761 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:11:30,762 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 05:11:30,772 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aebbd7bd-892e-42d2-b5e7-56006e80864e/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2023-11-19 05:11:30,968 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aebbd7bd-892e-42d2-b5e7-56006e80864e/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:11:30,968 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 05:11:30,968 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:11:30,969 INFO L85 PathProgramCache]: Analyzing trace with hash -1358462941, now seen corresponding path program 1 times [2023-11-19 05:11:30,969 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:11:30,969 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1027844127] [2023-11-19 05:11:30,969 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:11:30,969 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:11:30,982 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:11:31,064 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 3 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 05:11:31,064 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:11:31,064 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1027844127] [2023-11-19 05:11:31,065 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1027844127] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 05:11:31,065 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [209699538] [2023-11-19 05:11:31,065 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:11:31,065 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:11:31,065 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aebbd7bd-892e-42d2-b5e7-56006e80864e/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 05:11:31,066 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aebbd7bd-892e-42d2-b5e7-56006e80864e/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 05:11:31,068 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aebbd7bd-892e-42d2-b5e7-56006e80864e/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-11-19 05:11:31,108 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:11:31,109 INFO L262 TraceCheckSpWp]: Trace formula consists of 63 conjuncts, 10 conjunts are in the unsatisfiable core [2023-11-19 05:11:31,111 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 05:11:31,158 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 2 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 05:11:31,159 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-19 05:11:31,251 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 4 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 05:11:31,251 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [209699538] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-19 05:11:31,251 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1372625699] [2023-11-19 05:11:31,254 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2023-11-19 05:11:31,254 INFO L166 IcfgInterpreter]: Building call graph [2023-11-19 05:11:31,255 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-19 05:11:31,255 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-19 05:11:31,255 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-19 05:11:32,062 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 76 for LOIs [2023-11-19 05:11:32,432 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-19 05:11:33,563 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '716#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (or (exists ((|v_ULTIMATE.start_main_~z~0#1_BEFORE_CALL_12| Int) (|v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_12| Int) (|v_ULTIMATE.start_main_~x~0#1_BEFORE_CALL_10| Int) (|v_ULTIMATE.start_main_~w~0#1_BEFORE_CALL_10| Int)) (and (<= 1 |#StackHeapBarrier|) (= |v_ULTIMATE.start_main_~w~0#1_BEFORE_CALL_10| 0) (= (mod |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_12| 2) 0) (= |v_ULTIMATE.start_main_~x~0#1_BEFORE_CALL_10| 0) (<= 0 |v_ULTIMATE.start_main_~z~0#1_BEFORE_CALL_12|) (<= 1 |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_12|) (<= 268435455 (mod |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_12| 4294967296)))) (exists ((|v_ULTIMATE.start_main_~z~0#1_BEFORE_CALL_13| Int) (|v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_13| Int) (|v_ULTIMATE.start_main_~x~0#1_BEFORE_CALL_11| Int) (|v_ULTIMATE.start_main_~w~0#1_BEFORE_CALL_11| Int)) (and (<= 1 |#StackHeapBarrier|) (= |v_ULTIMATE.start_main_~w~0#1_BEFORE_CALL_11| 0) (= (mod |v_ULTIMATE.start_main_~z~0#1_BEFORE_CALL_13| 4) 0) (<= 0 |v_ULTIMATE.start_main_~z~0#1_BEFORE_CALL_13|) (= |v_ULTIMATE.start_main_~x~0#1_BEFORE_CALL_11| 0) (<= 0 |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_13|)))))' at error location [2023-11-19 05:11:33,564 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-19 05:11:33,564 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-19 05:11:33,565 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 6, 6] total 13 [2023-11-19 05:11:33,565 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [799731150] [2023-11-19 05:11:33,565 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-19 05:11:33,566 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2023-11-19 05:11:33,566 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:11:33,567 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2023-11-19 05:11:33,568 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=94, Invalid=368, Unknown=0, NotChecked=0, Total=462 [2023-11-19 05:11:33,568 INFO L87 Difference]: Start difference. First operand 23 states and 26 transitions. Second operand has 13 states, 13 states have (on average 2.1538461538461537) internal successors, (28), 13 states have internal predecessors, (28), 3 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-11-19 05:11:33,930 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:11:33,930 INFO L93 Difference]: Finished difference Result 67 states and 86 transitions. [2023-11-19 05:11:33,931 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2023-11-19 05:11:33,932 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 2.1538461538461537) internal successors, (28), 13 states have internal predecessors, (28), 3 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 17 [2023-11-19 05:11:33,932 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:11:33,932 INFO L225 Difference]: With dead ends: 67 [2023-11-19 05:11:33,932 INFO L226 Difference]: Without dead ends: 46 [2023-11-19 05:11:33,933 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 35 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 288 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=248, Invalid=874, Unknown=0, NotChecked=0, Total=1122 [2023-11-19 05:11:33,934 INFO L413 NwaCegarLoop]: 14 mSDtfsCounter, 32 mSDsluCounter, 75 mSDsCounter, 0 mSdLazyCounter, 76 mSolverCounterSat, 15 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 33 SdHoareTripleChecker+Valid, 89 SdHoareTripleChecker+Invalid, 91 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 15 IncrementalHoareTripleChecker+Valid, 76 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-19 05:11:33,934 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [33 Valid, 89 Invalid, 91 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [15 Valid, 76 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-19 05:11:33,935 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 46 states. [2023-11-19 05:11:33,952 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 46 to 45. [2023-11-19 05:11:33,953 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 45 states, 36 states have (on average 1.1944444444444444) internal successors, (43), 37 states have internal predecessors, (43), 6 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2023-11-19 05:11:33,954 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 45 states to 45 states and 54 transitions. [2023-11-19 05:11:33,954 INFO L78 Accepts]: Start accepts. Automaton has 45 states and 54 transitions. Word has length 17 [2023-11-19 05:11:33,954 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:11:33,955 INFO L495 AbstractCegarLoop]: Abstraction has 45 states and 54 transitions. [2023-11-19 05:11:33,955 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 2.1538461538461537) internal successors, (28), 13 states have internal predecessors, (28), 3 states have call successors, (4), 2 states have call predecessors, (4), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-11-19 05:11:33,955 INFO L276 IsEmpty]: Start isEmpty. Operand 45 states and 54 transitions. [2023-11-19 05:11:33,957 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 52 [2023-11-19 05:11:33,957 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:11:33,957 INFO L195 NwaCegarLoop]: trace histogram [12, 5, 4, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1] [2023-11-19 05:11:33,982 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aebbd7bd-892e-42d2-b5e7-56006e80864e/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2023-11-19 05:11:34,177 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aebbd7bd-892e-42d2-b5e7-56006e80864e/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:11:34,178 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 05:11:34,178 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:11:34,178 INFO L85 PathProgramCache]: Analyzing trace with hash -561813711, now seen corresponding path program 2 times [2023-11-19 05:11:34,178 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:11:34,179 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [199952087] [2023-11-19 05:11:34,179 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:11:34,179 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:11:34,213 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:11:34,410 INFO L134 CoverageAnalysis]: Checked inductivity of 174 backedges. 60 proven. 6 refuted. 0 times theorem prover too weak. 108 trivial. 0 not checked. [2023-11-19 05:11:34,411 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:11:34,411 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [199952087] [2023-11-19 05:11:34,411 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [199952087] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 05:11:34,411 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1859006172] [2023-11-19 05:11:34,411 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-19 05:11:34,412 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:11:34,412 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aebbd7bd-892e-42d2-b5e7-56006e80864e/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 05:11:34,413 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aebbd7bd-892e-42d2-b5e7-56006e80864e/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 05:11:34,435 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aebbd7bd-892e-42d2-b5e7-56006e80864e/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-11-19 05:11:34,487 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2023-11-19 05:11:34,487 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-19 05:11:34,488 INFO L262 TraceCheckSpWp]: Trace formula consists of 90 conjuncts, 17 conjunts are in the unsatisfiable core [2023-11-19 05:11:34,491 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 05:11:34,517 INFO L134 CoverageAnalysis]: Checked inductivity of 174 backedges. 64 proven. 45 refuted. 0 times theorem prover too weak. 65 trivial. 0 not checked. [2023-11-19 05:11:34,518 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-19 05:11:34,594 INFO L134 CoverageAnalysis]: Checked inductivity of 174 backedges. 66 proven. 6 refuted. 0 times theorem prover too weak. 102 trivial. 0 not checked. [2023-11-19 05:11:34,594 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1859006172] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-19 05:11:34,594 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1556877984] [2023-11-19 05:11:34,597 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2023-11-19 05:11:34,597 INFO L166 IcfgInterpreter]: Building call graph [2023-11-19 05:11:34,598 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-19 05:11:34,598 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-19 05:11:34,598 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-19 05:11:34,976 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 41 for LOIs [2023-11-19 05:11:35,082 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-19 05:11:35,716 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1246#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (or (and (<= 1 |#StackHeapBarrier|) (exists ((|v_ULTIMATE.start_main_~z~0#1_BEFORE_CALL_21| Int)) (and (<= 0 |v_ULTIMATE.start_main_~z~0#1_BEFORE_CALL_21|) (= (mod |v_ULTIMATE.start_main_~z~0#1_BEFORE_CALL_21| 4) 0) (<= 268435455 (mod |v_ULTIMATE.start_main_~z~0#1_BEFORE_CALL_21| 4294967296))))) (exists ((|v_ULTIMATE.start_main_~z~0#1_BEFORE_CALL_20| Int) (|v_ULTIMATE.start_main_~x~0#1_BEFORE_CALL_18| Int) (|v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_20| Int) (|v_ULTIMATE.start_main_~w~0#1_BEFORE_CALL_18| Int)) (and (= |v_ULTIMATE.start_main_~x~0#1_BEFORE_CALL_18| 0) (<= 1 |#StackHeapBarrier|) (= |v_ULTIMATE.start_main_~w~0#1_BEFORE_CALL_18| 0) (= (mod |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_20| 2) 0) (<= 268435455 (mod |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_20| 4294967296)) (<= 1 |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_20|) (<= 0 |v_ULTIMATE.start_main_~z~0#1_BEFORE_CALL_20|)))))' at error location [2023-11-19 05:11:35,716 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-19 05:11:35,716 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-19 05:11:35,717 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 11 [2023-11-19 05:11:35,717 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1203365807] [2023-11-19 05:11:35,717 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-19 05:11:35,718 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2023-11-19 05:11:35,718 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:11:35,718 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2023-11-19 05:11:35,719 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=77, Invalid=303, Unknown=0, NotChecked=0, Total=380 [2023-11-19 05:11:35,719 INFO L87 Difference]: Start difference. First operand 45 states and 54 transitions. Second operand has 11 states, 11 states have (on average 2.909090909090909) internal successors, (32), 11 states have internal predecessors, (32), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2023-11-19 05:11:35,879 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:11:35,879 INFO L93 Difference]: Finished difference Result 109 states and 147 transitions. [2023-11-19 05:11:35,880 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2023-11-19 05:11:35,880 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 2.909090909090909) internal successors, (32), 11 states have internal predecessors, (32), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 51 [2023-11-19 05:11:35,880 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:11:35,881 INFO L225 Difference]: With dead ends: 109 [2023-11-19 05:11:35,881 INFO L226 Difference]: Without dead ends: 66 [2023-11-19 05:11:35,882 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 161 GetRequests, 140 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 124 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=113, Invalid=393, Unknown=0, NotChecked=0, Total=506 [2023-11-19 05:11:35,883 INFO L413 NwaCegarLoop]: 14 mSDtfsCounter, 5 mSDsluCounter, 55 mSDsCounter, 0 mSdLazyCounter, 43 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 69 SdHoareTripleChecker+Invalid, 49 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 43 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-19 05:11:35,883 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [5 Valid, 69 Invalid, 49 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 43 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-19 05:11:35,884 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2023-11-19 05:11:35,905 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 65. [2023-11-19 05:11:35,905 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 65 states, 56 states have (on average 1.125) internal successors, (63), 57 states have internal predecessors, (63), 6 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (5), 5 states have call predecessors, (5), 5 states have call successors, (5) [2023-11-19 05:11:35,906 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 74 transitions. [2023-11-19 05:11:35,907 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 74 transitions. Word has length 51 [2023-11-19 05:11:35,907 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:11:35,907 INFO L495 AbstractCegarLoop]: Abstraction has 65 states and 74 transitions. [2023-11-19 05:11:35,907 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 11 states have (on average 2.909090909090909) internal successors, (32), 11 states have internal predecessors, (32), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2023-11-19 05:11:35,907 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 74 transitions. [2023-11-19 05:11:35,910 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 72 [2023-11-19 05:11:35,910 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:11:35,910 INFO L195 NwaCegarLoop]: trace histogram [32, 5, 4, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1] [2023-11-19 05:11:35,935 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aebbd7bd-892e-42d2-b5e7-56006e80864e/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Ended with exit code 0 [2023-11-19 05:11:36,130 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aebbd7bd-892e-42d2-b5e7-56006e80864e/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:11:36,131 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 05:11:36,131 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:11:36,131 INFO L85 PathProgramCache]: Analyzing trace with hash -192010439, now seen corresponding path program 3 times [2023-11-19 05:11:36,131 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:11:36,132 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [46289337] [2023-11-19 05:11:36,132 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:11:36,132 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:11:36,170 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:11:36,461 INFO L134 CoverageAnalysis]: Checked inductivity of 684 backedges. 255 proven. 36 refuted. 0 times theorem prover too weak. 393 trivial. 0 not checked. [2023-11-19 05:11:36,461 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:11:36,462 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [46289337] [2023-11-19 05:11:36,462 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [46289337] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 05:11:36,462 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [355101068] [2023-11-19 05:11:36,462 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-11-19 05:11:36,462 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:11:36,462 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aebbd7bd-892e-42d2-b5e7-56006e80864e/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 05:11:36,463 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aebbd7bd-892e-42d2-b5e7-56006e80864e/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 05:11:36,479 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aebbd7bd-892e-42d2-b5e7-56006e80864e/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-11-19 05:11:36,556 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-11-19 05:11:36,556 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-19 05:11:36,558 INFO L262 TraceCheckSpWp]: Trace formula consists of 198 conjuncts, 22 conjunts are in the unsatisfiable core [2023-11-19 05:11:36,564 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 05:11:36,818 INFO L134 CoverageAnalysis]: Checked inductivity of 684 backedges. 8 proven. 538 refuted. 0 times theorem prover too weak. 138 trivial. 0 not checked. [2023-11-19 05:11:36,818 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-19 05:11:37,285 INFO L134 CoverageAnalysis]: Checked inductivity of 684 backedges. 28 proven. 518 refuted. 0 times theorem prover too weak. 138 trivial. 0 not checked. [2023-11-19 05:11:37,286 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [355101068] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-19 05:11:37,286 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [773263116] [2023-11-19 05:11:37,288 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2023-11-19 05:11:37,289 INFO L166 IcfgInterpreter]: Building call graph [2023-11-19 05:11:37,289 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-19 05:11:37,289 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-19 05:11:37,289 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-19 05:11:37,590 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 41 for LOIs [2023-11-19 05:11:37,678 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-19 05:11:38,647 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2019#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (or (and (<= 1 |#StackHeapBarrier|) (exists ((|v_ULTIMATE.start_main_~z~0#1_BEFORE_CALL_31| Int)) (and (= (mod |v_ULTIMATE.start_main_~z~0#1_BEFORE_CALL_31| 4) 0) (<= 0 |v_ULTIMATE.start_main_~z~0#1_BEFORE_CALL_31|) (<= 268435455 (mod |v_ULTIMATE.start_main_~z~0#1_BEFORE_CALL_31| 4294967296))))) (exists ((|v_ULTIMATE.start_main_~x~0#1_BEFORE_CALL_28| Int) (|v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_38| Int) (|v_ULTIMATE.start_main_~z~0#1_BEFORE_CALL_30| Int) (|v_ULTIMATE.start_main_~w~0#1_BEFORE_CALL_28| Int)) (and (<= 1 |#StackHeapBarrier|) (= |v_ULTIMATE.start_main_~x~0#1_BEFORE_CALL_28| 0) (= (mod |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_38| 2) 0) (= |v_ULTIMATE.start_main_~w~0#1_BEFORE_CALL_28| 0) (<= 1 |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_38|) (<= 0 |v_ULTIMATE.start_main_~z~0#1_BEFORE_CALL_30|) (<= 268435455 (mod |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_38| 4294967296))))))' at error location [2023-11-19 05:11:38,647 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-19 05:11:38,647 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-19 05:11:38,647 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 12, 12] total 31 [2023-11-19 05:11:38,648 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [513001092] [2023-11-19 05:11:38,648 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-19 05:11:38,648 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 31 states [2023-11-19 05:11:38,649 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:11:38,649 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2023-11-19 05:11:38,650 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=231, Invalid=1329, Unknown=0, NotChecked=0, Total=1560 [2023-11-19 05:11:38,651 INFO L87 Difference]: Start difference. First operand 65 states and 74 transitions. Second operand has 31 states, 31 states have (on average 2.225806451612903) internal successors, (69), 31 states have internal predecessors, (69), 9 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2023-11-19 05:11:42,705 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:11:42,706 INFO L93 Difference]: Finished difference Result 211 states and 257 transitions. [2023-11-19 05:11:42,706 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 106 states. [2023-11-19 05:11:42,708 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 31 states have (on average 2.225806451612903) internal successors, (69), 31 states have internal predecessors, (69), 9 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) Word has length 71 [2023-11-19 05:11:42,708 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:11:42,712 INFO L225 Difference]: With dead ends: 211 [2023-11-19 05:11:42,713 INFO L226 Difference]: Without dead ends: 148 [2023-11-19 05:11:42,725 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 316 GetRequests, 185 SyntacticMatches, 0 SemanticMatches, 131 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6071 ImplicationChecksByTransitivity, 4.7s TimeCoverageRelationStatistics Valid=2472, Invalid=15084, Unknown=0, NotChecked=0, Total=17556 [2023-11-19 05:11:42,726 INFO L413 NwaCegarLoop]: 20 mSDtfsCounter, 90 mSDsluCounter, 262 mSDsCounter, 0 mSdLazyCounter, 1016 mSolverCounterSat, 24 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 91 SdHoareTripleChecker+Valid, 282 SdHoareTripleChecker+Invalid, 1040 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 24 IncrementalHoareTripleChecker+Valid, 1016 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2023-11-19 05:11:42,727 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [91 Valid, 282 Invalid, 1040 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [24 Valid, 1016 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2023-11-19 05:11:42,729 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 148 states. [2023-11-19 05:11:42,802 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 148 to 147. [2023-11-19 05:11:42,803 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 147 states, 132 states have (on average 1.0984848484848484) internal successors, (145), 133 states have internal predecessors, (145), 12 states have call successors, (12), 2 states have call predecessors, (12), 2 states have return successors, (11), 11 states have call predecessors, (11), 11 states have call successors, (11) [2023-11-19 05:11:42,808 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 147 states to 147 states and 168 transitions. [2023-11-19 05:11:42,808 INFO L78 Accepts]: Start accepts. Automaton has 147 states and 168 transitions. Word has length 71 [2023-11-19 05:11:42,808 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:11:42,808 INFO L495 AbstractCegarLoop]: Abstraction has 147 states and 168 transitions. [2023-11-19 05:11:42,809 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 31 states, 31 states have (on average 2.225806451612903) internal successors, (69), 31 states have internal predecessors, (69), 9 states have call successors, (10), 2 states have call predecessors, (10), 1 states have return successors, (9), 9 states have call predecessors, (9), 9 states have call successors, (9) [2023-11-19 05:11:42,809 INFO L276 IsEmpty]: Start isEmpty. Operand 147 states and 168 transitions. [2023-11-19 05:11:42,822 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 178 [2023-11-19 05:11:42,822 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:11:42,822 INFO L195 NwaCegarLoop]: trace histogram [90, 11, 10, 10, 10, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1] [2023-11-19 05:11:42,851 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aebbd7bd-892e-42d2-b5e7-56006e80864e/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2023-11-19 05:11:43,035 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aebbd7bd-892e-42d2-b5e7-56006e80864e/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:11:43,036 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 05:11:43,036 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:11:43,036 INFO L85 PathProgramCache]: Analyzing trace with hash -1667834927, now seen corresponding path program 4 times [2023-11-19 05:11:43,036 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:11:43,037 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1476981944] [2023-11-19 05:11:43,037 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:11:43,037 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:11:43,164 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:11:43,751 INFO L134 CoverageAnalysis]: Checked inductivity of 5295 backedges. 930 proven. 45 refuted. 0 times theorem prover too weak. 4320 trivial. 0 not checked. [2023-11-19 05:11:43,752 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:11:43,752 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1476981944] [2023-11-19 05:11:43,752 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1476981944] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 05:11:43,752 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2010681355] [2023-11-19 05:11:43,753 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-11-19 05:11:43,753 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:11:43,753 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aebbd7bd-892e-42d2-b5e7-56006e80864e/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 05:11:43,754 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aebbd7bd-892e-42d2-b5e7-56006e80864e/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 05:11:43,779 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aebbd7bd-892e-42d2-b5e7-56006e80864e/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2023-11-19 05:11:43,902 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:11:43,905 INFO L262 TraceCheckSpWp]: Trace formula consists of 462 conjuncts, 42 conjunts are in the unsatisfiable core [2023-11-19 05:11:43,912 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 05:11:44,137 INFO L134 CoverageAnalysis]: Checked inductivity of 5295 backedges. 910 proven. 45 refuted. 0 times theorem prover too weak. 4340 trivial. 0 not checked. [2023-11-19 05:11:44,147 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-19 05:11:45,287 INFO L134 CoverageAnalysis]: Checked inductivity of 5295 backedges. 957 proven. 3753 refuted. 0 times theorem prover too weak. 585 trivial. 0 not checked. [2023-11-19 05:11:45,288 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2010681355] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-19 05:11:45,288 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1722577443] [2023-11-19 05:11:45,291 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2023-11-19 05:11:45,291 INFO L166 IcfgInterpreter]: Building call graph [2023-11-19 05:11:45,292 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-19 05:11:45,292 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-19 05:11:45,292 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-19 05:11:45,919 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 76 for LOIs [2023-11-19 05:11:46,149 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-19 05:11:48,174 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3976#(and (or (exists ((|v_ULTIMATE.start_main_~w~0#1_BEFORE_CALL_41| Int) (|v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_60| Int) (|v_ULTIMATE.start_main_~x~0#1_BEFORE_CALL_41| Int) (|v_ULTIMATE.start_main_~z~0#1_BEFORE_CALL_43| Int)) (and (<= 1 |#StackHeapBarrier|) (<= 0 |v_ULTIMATE.start_main_~z~0#1_BEFORE_CALL_43|) (<= 0 |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_60|) (= (mod |v_ULTIMATE.start_main_~z~0#1_BEFORE_CALL_43| 4) 0) (= |v_ULTIMATE.start_main_~x~0#1_BEFORE_CALL_41| 0) (= |v_ULTIMATE.start_main_~w~0#1_BEFORE_CALL_41| 0))) (exists ((|v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_59| Int) (|v_ULTIMATE.start_main_~x~0#1_BEFORE_CALL_40| Int) (|v_ULTIMATE.start_main_~w~0#1_BEFORE_CALL_40| Int) (|v_ULTIMATE.start_main_~z~0#1_BEFORE_CALL_42| Int)) (and (<= 1 |#StackHeapBarrier|) (<= 268435455 (mod |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_59| 4294967296)) (= (mod |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_59| 2) 0) (= |v_ULTIMATE.start_main_~x~0#1_BEFORE_CALL_40| 0) (<= 1 |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_59|) (<= 0 |v_ULTIMATE.start_main_~z~0#1_BEFORE_CALL_42|) (= |v_ULTIMATE.start_main_~w~0#1_BEFORE_CALL_40| 0)))) (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0))' at error location [2023-11-19 05:11:48,174 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-19 05:11:48,174 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-19 05:11:48,175 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [12, 13, 22] total 43 [2023-11-19 05:11:48,175 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2129360674] [2023-11-19 05:11:48,175 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-19 05:11:48,177 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 43 states [2023-11-19 05:11:48,177 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:11:48,178 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2023-11-19 05:11:48,181 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=398, Invalid=2254, Unknown=0, NotChecked=0, Total=2652 [2023-11-19 05:11:48,182 INFO L87 Difference]: Start difference. First operand 147 states and 168 transitions. Second operand has 43 states, 43 states have (on average 1.930232558139535) internal successors, (83), 43 states have internal predecessors, (83), 10 states have call successors, (12), 2 states have call predecessors, (12), 2 states have return successors, (11), 10 states have call predecessors, (11), 10 states have call successors, (11) [2023-11-19 05:12:03,603 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:12:03,603 INFO L93 Difference]: Finished difference Result 938 states and 1218 transitions. [2023-11-19 05:12:03,604 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 142 states. [2023-11-19 05:12:03,604 INFO L78 Accepts]: Start accepts. Automaton has has 43 states, 43 states have (on average 1.930232558139535) internal successors, (83), 43 states have internal predecessors, (83), 10 states have call successors, (12), 2 states have call predecessors, (12), 2 states have return successors, (11), 10 states have call predecessors, (11), 10 states have call successors, (11) Word has length 177 [2023-11-19 05:12:03,605 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:12:03,610 INFO L225 Difference]: With dead ends: 938 [2023-11-19 05:12:03,611 INFO L226 Difference]: Without dead ends: 793 [2023-11-19 05:12:03,619 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 657 GetRequests, 492 SyntacticMatches, 0 SemanticMatches, 165 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7487 ImplicationChecksByTransitivity, 16.4s TimeCoverageRelationStatistics Valid=4941, Invalid=22781, Unknown=0, NotChecked=0, Total=27722 [2023-11-19 05:12:03,620 INFO L413 NwaCegarLoop]: 32 mSDtfsCounter, 67 mSDsluCounter, 414 mSDsCounter, 0 mSdLazyCounter, 2460 mSolverCounterSat, 57 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 69 SdHoareTripleChecker+Valid, 446 SdHoareTripleChecker+Invalid, 2517 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 57 IncrementalHoareTripleChecker+Valid, 2460 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.6s IncrementalHoareTripleChecker+Time [2023-11-19 05:12:03,620 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [69 Valid, 446 Invalid, 2517 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [57 Valid, 2460 Invalid, 0 Unknown, 0 Unchecked, 1.6s Time] [2023-11-19 05:12:03,622 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 793 states. [2023-11-19 05:12:03,849 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 793 to 788. [2023-11-19 05:12:03,851 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 788 states, 728 states have (on average 1.2019230769230769) internal successors, (875), 729 states have internal predecessors, (875), 57 states have call successors, (57), 2 states have call predecessors, (57), 2 states have return successors, (56), 56 states have call predecessors, (56), 56 states have call successors, (56) [2023-11-19 05:12:03,856 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 788 states to 788 states and 988 transitions. [2023-11-19 05:12:03,856 INFO L78 Accepts]: Start accepts. Automaton has 788 states and 988 transitions. Word has length 177 [2023-11-19 05:12:03,857 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:12:03,857 INFO L495 AbstractCegarLoop]: Abstraction has 788 states and 988 transitions. [2023-11-19 05:12:03,857 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 43 states, 43 states have (on average 1.930232558139535) internal successors, (83), 43 states have internal predecessors, (83), 10 states have call successors, (12), 2 states have call predecessors, (12), 2 states have return successors, (11), 10 states have call predecessors, (11), 10 states have call successors, (11) [2023-11-19 05:12:03,857 INFO L276 IsEmpty]: Start isEmpty. Operand 788 states and 988 transitions. [2023-11-19 05:12:03,862 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 198 [2023-11-19 05:12:03,863 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:12:03,863 INFO L195 NwaCegarLoop]: trace histogram [110, 11, 10, 10, 10, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1] [2023-11-19 05:12:03,880 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aebbd7bd-892e-42d2-b5e7-56006e80864e/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2023-11-19 05:12:04,066 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aebbd7bd-892e-42d2-b5e7-56006e80864e/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:12:04,066 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 05:12:04,066 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:12:04,067 INFO L85 PathProgramCache]: Analyzing trace with hash 124420357, now seen corresponding path program 5 times [2023-11-19 05:12:04,067 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:12:04,067 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1273928564] [2023-11-19 05:12:04,067 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:12:04,067 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:12:04,186 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:12:05,437 INFO L134 CoverageAnalysis]: Checked inductivity of 7485 backedges. 2109 proven. 210 refuted. 0 times theorem prover too weak. 5166 trivial. 0 not checked. [2023-11-19 05:12:05,438 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:12:05,438 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1273928564] [2023-11-19 05:12:05,438 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1273928564] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 05:12:05,438 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1141301450] [2023-11-19 05:12:05,438 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-19 05:12:05,438 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:12:05,438 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aebbd7bd-892e-42d2-b5e7-56006e80864e/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 05:12:05,440 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aebbd7bd-892e-42d2-b5e7-56006e80864e/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 05:12:05,459 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aebbd7bd-892e-42d2-b5e7-56006e80864e/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2023-11-19 05:12:05,553 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 13 check-sat command(s) [2023-11-19 05:12:05,553 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-19 05:12:05,556 INFO L262 TraceCheckSpWp]: Trace formula consists of 135 conjuncts, 46 conjunts are in the unsatisfiable core [2023-11-19 05:12:05,563 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 05:12:05,616 INFO L134 CoverageAnalysis]: Checked inductivity of 7485 backedges. 1160 proven. 1298 refuted. 0 times theorem prover too weak. 5027 trivial. 0 not checked. [2023-11-19 05:12:05,617 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-19 05:12:06,070 INFO L134 CoverageAnalysis]: Checked inductivity of 7485 backedges. 1247 proven. 55 refuted. 0 times theorem prover too weak. 6183 trivial. 0 not checked. [2023-11-19 05:12:06,070 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1141301450] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-19 05:12:06,070 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1337280346] [2023-11-19 05:12:06,073 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2023-11-19 05:12:06,073 INFO L166 IcfgInterpreter]: Building call graph [2023-11-19 05:12:06,073 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-19 05:12:06,073 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-19 05:12:06,074 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-19 05:12:06,395 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 41 for LOIs [2023-11-19 05:12:06,464 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-19 05:12:07,424 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '8727#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0) (or (exists ((|v_ULTIMATE.start_main_~x~0#1_BEFORE_CALL_48| Int) (|v_ULTIMATE.start_main_~w~0#1_BEFORE_CALL_48| Int) (|v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_67| Int) (|v_ULTIMATE.start_main_~z~0#1_BEFORE_CALL_50| Int)) (and (<= 1 |#StackHeapBarrier|) (<= 0 |v_ULTIMATE.start_main_~z~0#1_BEFORE_CALL_50|) (= |v_ULTIMATE.start_main_~w~0#1_BEFORE_CALL_48| 0) (<= 0 |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_67|) (= (mod |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_67| 2) 0) (<= 268435455 (mod |v_ULTIMATE.start_main_~y~0#1_BEFORE_CALL_67| 4294967296)) (= |v_ULTIMATE.start_main_~x~0#1_BEFORE_CALL_48| 0))) (and (exists ((|v_ULTIMATE.start_main_~z~0#1_BEFORE_CALL_51| Int)) (and (<= 268435455 (mod |v_ULTIMATE.start_main_~z~0#1_BEFORE_CALL_51| 4294967296)) (<= 0 |v_ULTIMATE.start_main_~z~0#1_BEFORE_CALL_51|) (= (mod |v_ULTIMATE.start_main_~z~0#1_BEFORE_CALL_51| 4) 0))) (<= 1 |#StackHeapBarrier|))))' at error location [2023-11-19 05:12:07,424 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-19 05:12:07,424 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-19 05:12:07,425 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 13, 13] total 34 [2023-11-19 05:12:07,425 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1262596497] [2023-11-19 05:12:07,425 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-19 05:12:07,426 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2023-11-19 05:12:07,426 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:12:07,427 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2023-11-19 05:12:07,428 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=357, Invalid=1449, Unknown=0, NotChecked=0, Total=1806 [2023-11-19 05:12:07,428 INFO L87 Difference]: Start difference. First operand 788 states and 988 transitions. Second operand has 34 states, 34 states have (on average 1.6176470588235294) internal successors, (55), 34 states have internal predecessors, (55), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2023-11-19 05:12:09,192 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:12:09,192 INFO L93 Difference]: Finished difference Result 1164 states and 1595 transitions. [2023-11-19 05:12:09,193 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 34 states. [2023-11-19 05:12:09,193 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 1.6176470588235294) internal successors, (55), 34 states have internal predecessors, (55), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 197 [2023-11-19 05:12:09,193 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:12:09,196 INFO L225 Difference]: With dead ends: 1164 [2023-11-19 05:12:09,196 INFO L226 Difference]: Without dead ends: 378 [2023-11-19 05:12:09,199 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 623 GetRequests, 572 SyntacticMatches, 0 SemanticMatches, 51 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 262 ImplicationChecksByTransitivity, 3.0s TimeCoverageRelationStatistics Valid=707, Invalid=2049, Unknown=0, NotChecked=0, Total=2756 [2023-11-19 05:12:09,199 INFO L413 NwaCegarLoop]: 14 mSDtfsCounter, 3 mSDsluCounter, 198 mSDsCounter, 0 mSdLazyCounter, 497 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 212 SdHoareTripleChecker+Invalid, 501 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 497 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-19 05:12:09,200 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [3 Valid, 212 Invalid, 501 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 497 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-19 05:12:09,201 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 378 states. [2023-11-19 05:12:09,295 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 378 to 377. [2023-11-19 05:12:09,296 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 377 states, 362 states have (on average 1.0359116022099448) internal successors, (375), 363 states have internal predecessors, (375), 12 states have call successors, (12), 2 states have call predecessors, (12), 2 states have return successors, (11), 11 states have call predecessors, (11), 11 states have call successors, (11) [2023-11-19 05:12:09,298 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 377 states to 377 states and 398 transitions. [2023-11-19 05:12:09,299 INFO L78 Accepts]: Start accepts. Automaton has 377 states and 398 transitions. Word has length 197 [2023-11-19 05:12:09,299 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:12:09,299 INFO L495 AbstractCegarLoop]: Abstraction has 377 states and 398 transitions. [2023-11-19 05:12:09,300 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 34 states, 34 states have (on average 1.6176470588235294) internal successors, (55), 34 states have internal predecessors, (55), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2023-11-19 05:12:09,300 INFO L276 IsEmpty]: Start isEmpty. Operand 377 states and 398 transitions. [2023-11-19 05:12:09,307 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 408 [2023-11-19 05:12:09,307 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:12:09,308 INFO L195 NwaCegarLoop]: trace histogram [320, 11, 10, 10, 10, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1] [2023-11-19 05:12:09,334 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aebbd7bd-892e-42d2-b5e7-56006e80864e/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2023-11-19 05:12:09,523 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aebbd7bd-892e-42d2-b5e7-56006e80864e/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2023-11-19 05:12:09,523 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 05:12:09,523 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:12:09,524 INFO L85 PathProgramCache]: Analyzing trace with hash 1741323173, now seen corresponding path program 6 times [2023-11-19 05:12:09,524 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:12:09,524 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2140251440] [2023-11-19 05:12:09,524 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:12:09,524 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:12:10,001 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:12:12,907 INFO L134 CoverageAnalysis]: Checked inductivity of 54630 backedges. 9831 proven. 528 refuted. 0 times theorem prover too weak. 44271 trivial. 0 not checked. [2023-11-19 05:12:12,907 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:12:12,907 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2140251440] [2023-11-19 05:12:12,908 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2140251440] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 05:12:12,908 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1491549397] [2023-11-19 05:12:12,908 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-11-19 05:12:12,908 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:12:12,908 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aebbd7bd-892e-42d2-b5e7-56006e80864e/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 05:12:12,912 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aebbd7bd-892e-42d2-b5e7-56006e80864e/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 05:12:12,916 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_aebbd7bd-892e-42d2-b5e7-56006e80864e/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2023-11-19 05:12:13,238 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-11-19 05:12:13,239 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-19 05:12:13,245 INFO L262 TraceCheckSpWp]: Trace formula consists of 1152 conjuncts, 46 conjunts are in the unsatisfiable core [2023-11-19 05:12:13,254 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 05:12:14,592 INFO L134 CoverageAnalysis]: Checked inductivity of 54630 backedges. 20 proven. 49447 refuted. 0 times theorem prover too weak. 5163 trivial. 0 not checked. [2023-11-19 05:12:14,592 INFO L327 TraceCheckSpWp]: Computing backward predicates...