./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/array-examples/standard_allDiff2_ground.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 0e0057cc Calling Ultimate with: /usr/lib/jvm/java-1.11.0-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ac43b18a-ef56-4239-8ac0-6c5db8f20f2d/bin/utaipan-verify-nQ1chXbOIh/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ac43b18a-ef56-4239-8ac0-6c5db8f20f2d/bin/utaipan-verify-nQ1chXbOIh/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ac43b18a-ef56-4239-8ac0-6c5db8f20f2d/bin/utaipan-verify-nQ1chXbOIh/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ac43b18a-ef56-4239-8ac0-6c5db8f20f2d/bin/utaipan-verify-nQ1chXbOIh/config/TaipanReach.xml -i ../../sv-benchmarks/c/array-examples/standard_allDiff2_ground.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ac43b18a-ef56-4239-8ac0-6c5db8f20f2d/bin/utaipan-verify-nQ1chXbOIh/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ac43b18a-ef56-4239-8ac0-6c5db8f20f2d/bin/utaipan-verify-nQ1chXbOIh --witnessprinter.witness.filename witness --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 45c2395b28f523380bfcff26ce2efb02406d69c6cc122ac9297e3f35ef9c7306 --- Real Ultimate output --- This is Ultimate 0.2.4-dev-0e0057c [2023-12-02 19:12:45,180 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-12-02 19:12:45,242 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ac43b18a-ef56-4239-8ac0-6c5db8f20f2d/bin/utaipan-verify-nQ1chXbOIh/config/svcomp-Reach-32bit-Taipan_Default.epf [2023-12-02 19:12:45,247 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-12-02 19:12:45,247 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-12-02 19:12:45,270 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-12-02 19:12:45,271 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-12-02 19:12:45,271 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-12-02 19:12:45,272 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-12-02 19:12:45,273 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-12-02 19:12:45,273 INFO L153 SettingsManager]: * User list type=DISABLED [2023-12-02 19:12:45,274 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-12-02 19:12:45,274 INFO L153 SettingsManager]: * Explicit value domain=true [2023-12-02 19:12:45,275 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-12-02 19:12:45,275 INFO L153 SettingsManager]: * Octagon Domain=false [2023-12-02 19:12:45,276 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-12-02 19:12:45,276 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-12-02 19:12:45,277 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-12-02 19:12:45,277 INFO L153 SettingsManager]: * Interval Domain=false [2023-12-02 19:12:45,278 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-12-02 19:12:45,279 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-12-02 19:12:45,279 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2023-12-02 19:12:45,280 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-12-02 19:12:45,281 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-12-02 19:12:45,281 INFO L153 SettingsManager]: * sizeof long=4 [2023-12-02 19:12:45,281 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-12-02 19:12:45,282 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-12-02 19:12:45,282 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-12-02 19:12:45,282 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-12-02 19:12:45,283 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-12-02 19:12:45,283 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-12-02 19:12:45,283 INFO L153 SettingsManager]: * sizeof long double=12 [2023-12-02 19:12:45,284 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2023-12-02 19:12:45,284 INFO L153 SettingsManager]: * Use constant arrays=true [2023-12-02 19:12:45,284 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-12-02 19:12:45,284 INFO L153 SettingsManager]: * Only consider context switches at boundaries of atomic blocks=true [2023-12-02 19:12:45,284 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-12-02 19:12:45,285 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-12-02 19:12:45,285 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-12-02 19:12:45,285 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-12-02 19:12:45,285 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2023-12-02 19:12:45,286 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-12-02 19:12:45,286 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-12-02 19:12:45,286 INFO L153 SettingsManager]: * Apply one-shot large block encoding in concurrent analysis=false [2023-12-02 19:12:45,286 INFO L153 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-12-02 19:12:45,287 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-12-02 19:12:45,287 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-12-02 19:12:45,287 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_ac43b18a-ef56-4239-8ac0-6c5db8f20f2d/bin/utaipan-verify-nQ1chXbOIh/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ac43b18a-ef56-4239-8ac0-6c5db8f20f2d/bin/utaipan-verify-nQ1chXbOIh Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 45c2395b28f523380bfcff26ce2efb02406d69c6cc122ac9297e3f35ef9c7306 [2023-12-02 19:12:45,499 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-12-02 19:12:45,518 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-12-02 19:12:45,521 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-12-02 19:12:45,522 INFO L270 PluginConnector]: Initializing CDTParser... [2023-12-02 19:12:45,522 INFO L274 PluginConnector]: CDTParser initialized [2023-12-02 19:12:45,524 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ac43b18a-ef56-4239-8ac0-6c5db8f20f2d/bin/utaipan-verify-nQ1chXbOIh/../../sv-benchmarks/c/array-examples/standard_allDiff2_ground.i [2023-12-02 19:12:48,267 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-12-02 19:12:48,443 INFO L384 CDTParser]: Found 1 translation units. [2023-12-02 19:12:48,443 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ac43b18a-ef56-4239-8ac0-6c5db8f20f2d/sv-benchmarks/c/array-examples/standard_allDiff2_ground.i [2023-12-02 19:12:48,451 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ac43b18a-ef56-4239-8ac0-6c5db8f20f2d/bin/utaipan-verify-nQ1chXbOIh/data/89da9a109/a0e318b5cae3487899e4ee5dd6ed3280/FLAG71c866af3 [2023-12-02 19:12:48,465 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ac43b18a-ef56-4239-8ac0-6c5db8f20f2d/bin/utaipan-verify-nQ1chXbOIh/data/89da9a109/a0e318b5cae3487899e4ee5dd6ed3280 [2023-12-02 19:12:48,468 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-12-02 19:12:48,469 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-12-02 19:12:48,470 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-12-02 19:12:48,471 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-12-02 19:12:48,476 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-12-02 19:12:48,477 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.12 07:12:48" (1/1) ... [2023-12-02 19:12:48,478 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@471d00e3 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 07:12:48, skipping insertion in model container [2023-12-02 19:12:48,478 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.12 07:12:48" (1/1) ... [2023-12-02 19:12:48,500 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-12-02 19:12:48,646 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_ac43b18a-ef56-4239-8ac0-6c5db8f20f2d/sv-benchmarks/c/array-examples/standard_allDiff2_ground.i[817,830] [2023-12-02 19:12:48,661 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-12-02 19:12:48,670 INFO L202 MainTranslator]: Completed pre-run [2023-12-02 19:12:48,683 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_ac43b18a-ef56-4239-8ac0-6c5db8f20f2d/sv-benchmarks/c/array-examples/standard_allDiff2_ground.i[817,830] [2023-12-02 19:12:48,691 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-12-02 19:12:48,707 INFO L206 MainTranslator]: Completed translation [2023-12-02 19:12:48,707 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 07:12:48 WrapperNode [2023-12-02 19:12:48,708 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-12-02 19:12:48,709 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-12-02 19:12:48,709 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-12-02 19:12:48,709 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-12-02 19:12:48,716 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 07:12:48" (1/1) ... [2023-12-02 19:12:48,723 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 07:12:48" (1/1) ... [2023-12-02 19:12:48,743 INFO L138 Inliner]: procedures = 16, calls = 15, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 85 [2023-12-02 19:12:48,743 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-12-02 19:12:48,744 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-12-02 19:12:48,744 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-12-02 19:12:48,744 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-12-02 19:12:48,753 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 07:12:48" (1/1) ... [2023-12-02 19:12:48,753 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 07:12:48" (1/1) ... [2023-12-02 19:12:48,755 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 07:12:48" (1/1) ... [2023-12-02 19:12:48,756 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 07:12:48" (1/1) ... [2023-12-02 19:12:48,761 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 07:12:48" (1/1) ... [2023-12-02 19:12:48,765 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 07:12:48" (1/1) ... [2023-12-02 19:12:48,766 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 07:12:48" (1/1) ... [2023-12-02 19:12:48,767 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 07:12:48" (1/1) ... [2023-12-02 19:12:48,769 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-12-02 19:12:48,770 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-12-02 19:12:48,770 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-12-02 19:12:48,771 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-12-02 19:12:48,771 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 07:12:48" (1/1) ... [2023-12-02 19:12:48,778 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-12-02 19:12:48,789 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ac43b18a-ef56-4239-8ac0-6c5db8f20f2d/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 19:12:48,802 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ac43b18a-ef56-4239-8ac0-6c5db8f20f2d/bin/utaipan-verify-nQ1chXbOIh/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-12-02 19:12:48,807 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ac43b18a-ef56-4239-8ac0-6c5db8f20f2d/bin/utaipan-verify-nQ1chXbOIh/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-12-02 19:12:48,836 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-12-02 19:12:48,837 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-12-02 19:12:48,837 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2023-12-02 19:12:48,837 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-12-02 19:12:48,837 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-12-02 19:12:48,837 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-12-02 19:12:48,837 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-12-02 19:12:48,837 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-12-02 19:12:48,902 INFO L241 CfgBuilder]: Building ICFG [2023-12-02 19:12:48,904 INFO L267 CfgBuilder]: Building CFG for each procedure with an implementation [2023-12-02 19:12:49,043 INFO L282 CfgBuilder]: Performing block encoding [2023-12-02 19:12:49,102 INFO L304 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-12-02 19:12:49,102 INFO L309 CfgBuilder]: Removed 5 assume(true) statements. [2023-12-02 19:12:49,104 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.12 07:12:49 BoogieIcfgContainer [2023-12-02 19:12:49,104 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-12-02 19:12:49,107 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-12-02 19:12:49,107 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-12-02 19:12:49,111 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-12-02 19:12:49,111 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.12 07:12:48" (1/3) ... [2023-12-02 19:12:49,112 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@462a16c5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.12 07:12:49, skipping insertion in model container [2023-12-02 19:12:49,112 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.12 07:12:48" (2/3) ... [2023-12-02 19:12:49,113 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@462a16c5 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.12 07:12:49, skipping insertion in model container [2023-12-02 19:12:49,113 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.12 07:12:49" (3/3) ... [2023-12-02 19:12:49,114 INFO L112 eAbstractionObserver]: Analyzing ICFG standard_allDiff2_ground.i [2023-12-02 19:12:49,135 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-12-02 19:12:49,135 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-12-02 19:12:49,182 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-12-02 19:12:49,188 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;@3bb1ea3b, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-12-02 19:12:49,188 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-12-02 19:12:49,192 INFO L276 IsEmpty]: Start isEmpty. Operand has 13 states, 11 states have (on average 1.7272727272727273) internal successors, (19), 12 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 19:12:49,199 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2023-12-02 19:12:49,199 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 19:12:49,199 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 19:12:49,200 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 19:12:49,205 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 19:12:49,205 INFO L85 PathProgramCache]: Analyzing trace with hash -2134111879, now seen corresponding path program 1 times [2023-12-02 19:12:49,215 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 19:12:49,216 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1436869134] [2023-12-02 19:12:49,216 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 19:12:49,217 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 19:12:49,312 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 19:12:49,407 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 19:12:49,407 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 19:12:49,408 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1436869134] [2023-12-02 19:12:49,408 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1436869134] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 19:12:49,409 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-12-02 19:12:49,409 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-12-02 19:12:49,410 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [406898429] [2023-12-02 19:12:49,411 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 19:12:49,415 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-12-02 19:12:49,416 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 19:12:49,445 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-12-02 19:12:49,446 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-12-02 19:12:49,448 INFO L87 Difference]: Start difference. First operand has 13 states, 11 states have (on average 1.7272727272727273) internal successors, (19), 12 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 2 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 19:12:49,491 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 19:12:49,491 INFO L93 Difference]: Finished difference Result 25 states and 37 transitions. [2023-12-02 19:12:49,493 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-12-02 19:12:49,494 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 2 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 8 [2023-12-02 19:12:49,494 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 19:12:49,502 INFO L225 Difference]: With dead ends: 25 [2023-12-02 19:12:49,502 INFO L226 Difference]: Without dead ends: 12 [2023-12-02 19:12:49,504 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-12-02 19:12:49,508 INFO L413 NwaCegarLoop]: 8 mSDtfsCounter, 0 mSDsluCounter, 7 mSDsCounter, 0 mSdLazyCounter, 20 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 15 SdHoareTripleChecker+Invalid, 20 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 20 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-12-02 19:12:49,509 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 15 Invalid, 20 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 20 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-12-02 19:12:49,526 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2023-12-02 19:12:49,537 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 12. [2023-12-02 19:12:49,538 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 12 states, 11 states have (on average 1.4545454545454546) internal successors, (16), 11 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 19:12:49,539 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 16 transitions. [2023-12-02 19:12:49,540 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 16 transitions. Word has length 8 [2023-12-02 19:12:49,540 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 19:12:49,540 INFO L495 AbstractCegarLoop]: Abstraction has 12 states and 16 transitions. [2023-12-02 19:12:49,541 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 2 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 19:12:49,541 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 16 transitions. [2023-12-02 19:12:49,541 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2023-12-02 19:12:49,542 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 19:12:49,542 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 19:12:49,542 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-12-02 19:12:49,542 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 19:12:49,543 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 19:12:49,543 INFO L85 PathProgramCache]: Analyzing trace with hash 500810643, now seen corresponding path program 1 times [2023-12-02 19:12:49,543 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 19:12:49,544 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [261720769] [2023-12-02 19:12:49,544 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 19:12:49,544 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 19:12:49,563 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 19:12:49,674 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-12-02 19:12:49,674 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 19:12:49,674 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [261720769] [2023-12-02 19:12:49,675 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [261720769] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 19:12:49,675 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [580598955] [2023-12-02 19:12:49,675 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 19:12:49,675 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 19:12:49,676 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ac43b18a-ef56-4239-8ac0-6c5db8f20f2d/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 19:12:49,677 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ac43b18a-ef56-4239-8ac0-6c5db8f20f2d/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 19:12:49,682 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ac43b18a-ef56-4239-8ac0-6c5db8f20f2d/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-12-02 19:12:49,747 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 19:12:49,749 INFO L262 TraceCheckSpWp]: Trace formula consists of 64 conjuncts, 3 conjunts are in the unsatisfiable core [2023-12-02 19:12:49,753 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 19:12:49,787 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 19:12:49,787 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 19:12:49,787 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [580598955] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 19:12:49,787 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 19:12:49,788 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [3] total 5 [2023-12-02 19:12:49,788 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1441117039] [2023-12-02 19:12:49,789 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 19:12:49,789 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-12-02 19:12:49,789 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 19:12:49,790 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-12-02 19:12:49,790 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2023-12-02 19:12:49,791 INFO L87 Difference]: Start difference. First operand 12 states and 16 transitions. Second operand has 4 states, 4 states have (on average 2.25) internal successors, (9), 4 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 19:12:49,833 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 19:12:49,833 INFO L93 Difference]: Finished difference Result 21 states and 28 transitions. [2023-12-02 19:12:49,834 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-12-02 19:12:49,834 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.25) internal successors, (9), 4 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 9 [2023-12-02 19:12:49,834 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 19:12:49,835 INFO L225 Difference]: With dead ends: 21 [2023-12-02 19:12:49,835 INFO L226 Difference]: Without dead ends: 14 [2023-12-02 19:12:49,836 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 8 SyntacticMatches, 0 SemanticMatches, 4 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=12, Invalid=18, Unknown=0, NotChecked=0, Total=30 [2023-12-02 19:12:49,837 INFO L413 NwaCegarLoop]: 6 mSDtfsCounter, 3 mSDsluCounter, 11 mSDsCounter, 0 mSdLazyCounter, 26 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 17 SdHoareTripleChecker+Invalid, 27 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 26 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-12-02 19:12:49,838 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [3 Valid, 17 Invalid, 27 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 26 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-12-02 19:12:49,839 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2023-12-02 19:12:49,841 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 13. [2023-12-02 19:12:49,841 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 13 states, 12 states have (on average 1.4166666666666667) internal successors, (17), 12 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 19:12:49,842 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 17 transitions. [2023-12-02 19:12:49,842 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 17 transitions. Word has length 9 [2023-12-02 19:12:49,843 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 19:12:49,843 INFO L495 AbstractCegarLoop]: Abstraction has 13 states and 17 transitions. [2023-12-02 19:12:49,843 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 2.25) internal successors, (9), 4 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 19:12:49,843 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 17 transitions. [2023-12-02 19:12:49,844 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2023-12-02 19:12:49,844 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 19:12:49,844 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 19:12:49,854 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ac43b18a-ef56-4239-8ac0-6c5db8f20f2d/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-12-02 19:12:50,049 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ac43b18a-ef56-4239-8ac0-6c5db8f20f2d/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 19:12:50,049 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 19:12:50,050 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 19:12:50,050 INFO L85 PathProgramCache]: Analyzing trace with hash 1187540134, now seen corresponding path program 1 times [2023-12-02 19:12:50,050 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 19:12:50,050 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [208085348] [2023-12-02 19:12:50,051 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 19:12:50,051 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 19:12:50,065 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 19:12:50,124 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 19:12:50,124 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 19:12:50,125 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [208085348] [2023-12-02 19:12:50,125 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [208085348] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 19:12:50,125 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [47550176] [2023-12-02 19:12:50,125 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 19:12:50,126 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 19:12:50,126 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ac43b18a-ef56-4239-8ac0-6c5db8f20f2d/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 19:12:50,127 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ac43b18a-ef56-4239-8ac0-6c5db8f20f2d/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 19:12:50,130 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ac43b18a-ef56-4239-8ac0-6c5db8f20f2d/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-12-02 19:12:50,188 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 19:12:50,189 INFO L262 TraceCheckSpWp]: Trace formula consists of 71 conjuncts, 3 conjunts are in the unsatisfiable core [2023-12-02 19:12:50,190 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 19:12:50,207 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 19:12:50,207 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 19:12:50,228 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-12-02 19:12:50,228 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [47550176] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 19:12:50,228 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1892627381] [2023-12-02 19:12:50,250 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2023-12-02 19:12:50,250 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 19:12:50,254 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 19:12:50,259 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 19:12:50,260 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 19:12:50,591 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 19:12:50,656 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSifa [1892627381] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 19:12:50,656 INFO L185 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2023-12-02 19:12:50,656 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [3, 3, 3] total 9 [2023-12-02 19:12:50,657 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2007546658] [2023-12-02 19:12:50,657 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 19:12:50,658 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-12-02 19:12:50,658 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 19:12:50,659 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-12-02 19:12:50,659 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=36, Invalid=54, Unknown=0, NotChecked=0, Total=90 [2023-12-02 19:12:50,659 INFO L87 Difference]: Start difference. First operand 13 states and 17 transitions. Second operand has 5 states, 5 states have (on average 2.2) internal successors, (11), 4 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 19:12:50,713 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 19:12:50,713 INFO L93 Difference]: Finished difference Result 24 states and 33 transitions. [2023-12-02 19:12:50,713 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-12-02 19:12:50,714 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.2) internal successors, (11), 4 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 11 [2023-12-02 19:12:50,714 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 19:12:50,714 INFO L225 Difference]: With dead ends: 24 [2023-12-02 19:12:50,714 INFO L226 Difference]: Without dead ends: 15 [2023-12-02 19:12:50,715 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 26 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=36, Invalid=54, Unknown=0, NotChecked=0, Total=90 [2023-12-02 19:12:50,716 INFO L413 NwaCegarLoop]: 4 mSDtfsCounter, 10 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 23 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 8 SdHoareTripleChecker+Invalid, 31 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 23 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-12-02 19:12:50,717 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [10 Valid, 8 Invalid, 31 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 23 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-12-02 19:12:50,718 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2023-12-02 19:12:50,722 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 14. [2023-12-02 19:12:50,722 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 14 states, 13 states have (on average 1.3846153846153846) internal successors, (18), 13 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 19:12:50,723 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 18 transitions. [2023-12-02 19:12:50,723 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 18 transitions. Word has length 11 [2023-12-02 19:12:50,723 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 19:12:50,723 INFO L495 AbstractCegarLoop]: Abstraction has 14 states and 18 transitions. [2023-12-02 19:12:50,724 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 2.2) internal successors, (11), 4 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 19:12:50,724 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 18 transitions. [2023-12-02 19:12:50,724 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2023-12-02 19:12:50,724 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 19:12:50,724 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 19:12:50,733 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ac43b18a-ef56-4239-8ac0-6c5db8f20f2d/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Ended with exit code 0 [2023-12-02 19:12:50,929 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ac43b18a-ef56-4239-8ac0-6c5db8f20f2d/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 19:12:50,930 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 19:12:50,930 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 19:12:50,930 INFO L85 PathProgramCache]: Analyzing trace with hash -1175254257, now seen corresponding path program 1 times [2023-12-02 19:12:50,930 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 19:12:50,930 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [403848321] [2023-12-02 19:12:50,930 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 19:12:50,931 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 19:12:50,941 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 19:12:50,989 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-12-02 19:12:50,990 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 19:12:50,990 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [403848321] [2023-12-02 19:12:50,990 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [403848321] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 19:12:50,990 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1163716421] [2023-12-02 19:12:50,990 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 19:12:50,991 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 19:12:50,991 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ac43b18a-ef56-4239-8ac0-6c5db8f20f2d/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 19:12:50,992 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ac43b18a-ef56-4239-8ac0-6c5db8f20f2d/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 19:12:50,996 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ac43b18a-ef56-4239-8ac0-6c5db8f20f2d/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-12-02 19:12:51,044 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 19:12:51,045 INFO L262 TraceCheckSpWp]: Trace formula consists of 76 conjuncts, 3 conjunts are in the unsatisfiable core [2023-12-02 19:12:51,046 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 19:12:51,056 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-12-02 19:12:51,056 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 19:12:51,072 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-12-02 19:12:51,072 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1163716421] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 19:12:51,072 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1901633505] [2023-12-02 19:12:51,075 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2023-12-02 19:12:51,075 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 19:12:51,075 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 19:12:51,076 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 19:12:51,076 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 19:12:51,318 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 19:12:51,505 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '356#(and (<= 100000 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start_main_#t~mem9#1| (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) 0)) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= |ULTIMATE.start_main_~y~0#1| 1) (= |ULTIMATE.start_main_~r~0#1| 1) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) 4) |ULTIMATE.start_main_#t~mem10#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start_main_#t~mem9#1| |ULTIMATE.start_main_#t~mem10#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0) (= |ULTIMATE.start_main_~x~0#1| 0))' at error location [2023-12-02 19:12:51,505 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 19:12:51,505 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 19:12:51,505 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3, 3] total 6 [2023-12-02 19:12:51,506 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2028597623] [2023-12-02 19:12:51,506 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 19:12:51,506 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-12-02 19:12:51,506 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 19:12:51,507 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-12-02 19:12:51,507 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=54, Invalid=156, Unknown=0, NotChecked=0, Total=210 [2023-12-02 19:12:51,507 INFO L87 Difference]: Start difference. First operand 14 states and 18 transitions. Second operand has 7 states, 7 states have (on average 2.4285714285714284) internal successors, (17), 6 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 19:12:51,563 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 19:12:51,564 INFO L93 Difference]: Finished difference Result 46 states and 62 transitions. [2023-12-02 19:12:51,564 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-12-02 19:12:51,564 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 2.4285714285714284) internal successors, (17), 6 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 12 [2023-12-02 19:12:51,564 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 19:12:51,565 INFO L225 Difference]: With dead ends: 46 [2023-12-02 19:12:51,565 INFO L226 Difference]: Without dead ends: 35 [2023-12-02 19:12:51,566 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 37 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 56 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=54, Invalid=156, Unknown=0, NotChecked=0, Total=210 [2023-12-02 19:12:51,567 INFO L413 NwaCegarLoop]: 6 mSDtfsCounter, 35 mSDsluCounter, 18 mSDsCounter, 0 mSdLazyCounter, 32 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 35 SdHoareTripleChecker+Valid, 24 SdHoareTripleChecker+Invalid, 38 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 32 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-12-02 19:12:51,567 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [35 Valid, 24 Invalid, 38 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 32 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-12-02 19:12:51,568 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 35 states. [2023-12-02 19:12:51,573 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 35 to 17. [2023-12-02 19:12:51,573 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17 states, 16 states have (on average 1.3125) internal successors, (21), 16 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 19:12:51,574 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 21 transitions. [2023-12-02 19:12:51,574 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 21 transitions. Word has length 12 [2023-12-02 19:12:51,574 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 19:12:51,574 INFO L495 AbstractCegarLoop]: Abstraction has 17 states and 21 transitions. [2023-12-02 19:12:51,574 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 2.4285714285714284) internal successors, (17), 6 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 19:12:51,574 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 21 transitions. [2023-12-02 19:12:51,575 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2023-12-02 19:12:51,575 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 19:12:51,575 INFO L195 NwaCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 19:12:51,580 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ac43b18a-ef56-4239-8ac0-6c5db8f20f2d/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2023-12-02 19:12:51,776 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ac43b18a-ef56-4239-8ac0-6c5db8f20f2d/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 19:12:51,777 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 19:12:51,777 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 19:12:51,777 INFO L85 PathProgramCache]: Analyzing trace with hash -510464791, now seen corresponding path program 2 times [2023-12-02 19:12:51,777 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 19:12:51,777 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1621948575] [2023-12-02 19:12:51,778 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 19:12:51,778 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 19:12:51,798 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 19:12:51,863 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2023-12-02 19:12:51,864 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 19:12:51,864 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1621948575] [2023-12-02 19:12:51,864 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1621948575] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 19:12:51,864 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [186636075] [2023-12-02 19:12:51,864 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-12-02 19:12:51,864 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 19:12:51,864 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ac43b18a-ef56-4239-8ac0-6c5db8f20f2d/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 19:12:51,865 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ac43b18a-ef56-4239-8ac0-6c5db8f20f2d/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 19:12:51,877 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ac43b18a-ef56-4239-8ac0-6c5db8f20f2d/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-12-02 19:12:51,932 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2023-12-02 19:12:51,932 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 19:12:51,933 INFO L262 TraceCheckSpWp]: Trace formula consists of 80 conjuncts, 4 conjunts are in the unsatisfiable core [2023-12-02 19:12:51,934 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 19:12:51,948 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2023-12-02 19:12:51,948 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 19:12:51,969 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2023-12-02 19:12:51,969 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [186636075] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 19:12:51,969 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1998550280] [2023-12-02 19:12:51,972 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2023-12-02 19:12:51,972 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 19:12:51,972 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 19:12:51,972 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 19:12:51,972 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 19:12:52,216 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 19:12:52,410 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '555#(and (<= 100000 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start_main_#t~mem9#1| (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) 0)) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= |ULTIMATE.start_main_~y~0#1| 1) (= |ULTIMATE.start_main_~r~0#1| 1) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) 4) |ULTIMATE.start_main_#t~mem10#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start_main_#t~mem9#1| |ULTIMATE.start_main_#t~mem10#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0) (= |ULTIMATE.start_main_~x~0#1| 0))' at error location [2023-12-02 19:12:52,410 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 19:12:52,410 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 19:12:52,410 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 8 [2023-12-02 19:12:52,411 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1473836512] [2023-12-02 19:12:52,411 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 19:12:52,411 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2023-12-02 19:12:52,411 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 19:12:52,412 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2023-12-02 19:12:52,412 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=56, Invalid=184, Unknown=0, NotChecked=0, Total=240 [2023-12-02 19:12:52,412 INFO L87 Difference]: Start difference. First operand 17 states and 21 transitions. Second operand has 8 states, 8 states have (on average 2.625) internal successors, (21), 8 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 19:12:52,501 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 19:12:52,501 INFO L93 Difference]: Finished difference Result 32 states and 43 transitions. [2023-12-02 19:12:52,502 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2023-12-02 19:12:52,502 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 2.625) internal successors, (21), 8 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 15 [2023-12-02 19:12:52,502 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 19:12:52,503 INFO L225 Difference]: With dead ends: 32 [2023-12-02 19:12:52,503 INFO L226 Difference]: Without dead ends: 23 [2023-12-02 19:12:52,503 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 51 GetRequests, 34 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 74 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=74, Invalid=268, Unknown=0, NotChecked=0, Total=342 [2023-12-02 19:12:52,504 INFO L413 NwaCegarLoop]: 6 mSDtfsCounter, 8 mSDsluCounter, 23 mSDsCounter, 0 mSdLazyCounter, 44 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8 SdHoareTripleChecker+Valid, 29 SdHoareTripleChecker+Invalid, 51 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 44 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 19:12:52,504 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [8 Valid, 29 Invalid, 51 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 44 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 19:12:52,505 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2023-12-02 19:12:52,510 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2023-12-02 19:12:52,511 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23 states, 22 states have (on average 1.3636363636363635) internal successors, (30), 22 states have internal predecessors, (30), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 19:12:52,511 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 30 transitions. [2023-12-02 19:12:52,511 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 30 transitions. Word has length 15 [2023-12-02 19:12:52,512 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 19:12:52,512 INFO L495 AbstractCegarLoop]: Abstraction has 23 states and 30 transitions. [2023-12-02 19:12:52,512 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 2.625) internal successors, (21), 8 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 19:12:52,512 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 30 transitions. [2023-12-02 19:12:52,513 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2023-12-02 19:12:52,513 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 19:12:52,513 INFO L195 NwaCegarLoop]: trace histogram [4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 19:12:52,518 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ac43b18a-ef56-4239-8ac0-6c5db8f20f2d/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Ended with exit code 0 [2023-12-02 19:12:52,716 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ac43b18a-ef56-4239-8ac0-6c5db8f20f2d/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 19:12:52,717 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 19:12:52,717 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 19:12:52,717 INFO L85 PathProgramCache]: Analyzing trace with hash 956126562, now seen corresponding path program 3 times [2023-12-02 19:12:52,717 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 19:12:52,717 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [832669758] [2023-12-02 19:12:52,717 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 19:12:52,718 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 19:12:52,736 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 19:12:52,823 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2023-12-02 19:12:52,824 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 19:12:52,824 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [832669758] [2023-12-02 19:12:52,824 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [832669758] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 19:12:52,824 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [27291726] [2023-12-02 19:12:52,824 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-12-02 19:12:52,824 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 19:12:52,824 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ac43b18a-ef56-4239-8ac0-6c5db8f20f2d/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 19:12:52,825 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ac43b18a-ef56-4239-8ac0-6c5db8f20f2d/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 19:12:52,828 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ac43b18a-ef56-4239-8ac0-6c5db8f20f2d/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-12-02 19:12:52,895 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-12-02 19:12:52,895 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 19:12:52,896 INFO L262 TraceCheckSpWp]: Trace formula consists of 124 conjuncts, 7 conjunts are in the unsatisfiable core [2023-12-02 19:12:52,898 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 19:12:52,935 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 19 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2023-12-02 19:12:52,935 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 19:12:53,008 INFO L134 CoverageAnalysis]: Checked inductivity of 30 backedges. 0 proven. 19 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2023-12-02 19:12:53,009 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [27291726] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 19:12:53,009 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2111312522] [2023-12-02 19:12:53,011 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2023-12-02 19:12:53,011 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 19:12:53,012 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 19:12:53,012 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 19:12:53,012 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 19:12:53,212 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 19:12:53,427 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '794#(and (<= 100000 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start_main_#t~mem9#1| (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) 0)) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= |ULTIMATE.start_main_~y~0#1| 1) (= |ULTIMATE.start_main_~r~0#1| 1) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) 4) |ULTIMATE.start_main_#t~mem10#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start_main_#t~mem9#1| |ULTIMATE.start_main_#t~mem10#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0) (= |ULTIMATE.start_main_~x~0#1| 0))' at error location [2023-12-02 19:12:53,428 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 19:12:53,428 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 19:12:53,428 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 8, 8] total 14 [2023-12-02 19:12:53,428 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [571867942] [2023-12-02 19:12:53,428 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 19:12:53,429 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2023-12-02 19:12:53,429 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 19:12:53,429 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2023-12-02 19:12:53,430 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=113, Invalid=349, Unknown=0, NotChecked=0, Total=462 [2023-12-02 19:12:53,430 INFO L87 Difference]: Start difference. First operand 23 states and 30 transitions. Second operand has 14 states, 14 states have (on average 2.857142857142857) internal successors, (40), 14 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 19:12:53,629 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 19:12:53,629 INFO L93 Difference]: Finished difference Result 65 states and 97 transitions. [2023-12-02 19:12:53,629 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2023-12-02 19:12:53,629 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 2.857142857142857) internal successors, (40), 14 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 21 [2023-12-02 19:12:53,630 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 19:12:53,630 INFO L225 Difference]: With dead ends: 65 [2023-12-02 19:12:53,630 INFO L226 Difference]: Without dead ends: 42 [2023-12-02 19:12:53,631 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 73 GetRequests, 47 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 166 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=167, Invalid=589, Unknown=0, NotChecked=0, Total=756 [2023-12-02 19:12:53,632 INFO L413 NwaCegarLoop]: 6 mSDtfsCounter, 23 mSDsluCounter, 29 mSDsCounter, 0 mSdLazyCounter, 77 mSolverCounterSat, 18 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 23 SdHoareTripleChecker+Valid, 35 SdHoareTripleChecker+Invalid, 95 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 18 IncrementalHoareTripleChecker+Valid, 77 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-12-02 19:12:53,632 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [23 Valid, 35 Invalid, 95 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [18 Valid, 77 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-12-02 19:12:53,633 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2023-12-02 19:12:53,643 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 42. [2023-12-02 19:12:53,643 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 42 states, 41 states have (on average 1.3414634146341464) internal successors, (55), 41 states have internal predecessors, (55), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 19:12:53,644 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 42 states to 42 states and 55 transitions. [2023-12-02 19:12:53,644 INFO L78 Accepts]: Start accepts. Automaton has 42 states and 55 transitions. Word has length 21 [2023-12-02 19:12:53,645 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 19:12:53,645 INFO L495 AbstractCegarLoop]: Abstraction has 42 states and 55 transitions. [2023-12-02 19:12:53,645 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 2.857142857142857) internal successors, (40), 14 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 19:12:53,645 INFO L276 IsEmpty]: Start isEmpty. Operand 42 states and 55 transitions. [2023-12-02 19:12:53,646 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2023-12-02 19:12:53,646 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 19:12:53,646 INFO L195 NwaCegarLoop]: trace histogram [11, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 19:12:53,652 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ac43b18a-ef56-4239-8ac0-6c5db8f20f2d/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Ended with exit code 0 [2023-12-02 19:12:53,852 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ac43b18a-ef56-4239-8ac0-6c5db8f20f2d/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 19:12:53,852 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 19:12:53,853 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 19:12:53,853 INFO L85 PathProgramCache]: Analyzing trace with hash -41952518, now seen corresponding path program 4 times [2023-12-02 19:12:53,853 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 19:12:53,853 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1115688846] [2023-12-02 19:12:53,853 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 19:12:53,853 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 19:12:53,886 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 19:12:54,097 INFO L134 CoverageAnalysis]: Checked inductivity of 176 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 110 trivial. 0 not checked. [2023-12-02 19:12:54,097 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 19:12:54,097 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1115688846] [2023-12-02 19:12:54,097 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1115688846] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 19:12:54,098 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1695745274] [2023-12-02 19:12:54,098 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-12-02 19:12:54,098 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 19:12:54,098 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ac43b18a-ef56-4239-8ac0-6c5db8f20f2d/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 19:12:54,099 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ac43b18a-ef56-4239-8ac0-6c5db8f20f2d/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 19:12:54,100 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ac43b18a-ef56-4239-8ac0-6c5db8f20f2d/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2023-12-02 19:12:54,177 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 19:12:54,178 INFO L262 TraceCheckSpWp]: Trace formula consists of 229 conjuncts, 13 conjunts are in the unsatisfiable core [2023-12-02 19:12:54,181 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 19:12:54,205 INFO L134 CoverageAnalysis]: Checked inductivity of 176 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 110 trivial. 0 not checked. [2023-12-02 19:12:54,205 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 19:12:54,439 INFO L134 CoverageAnalysis]: Checked inductivity of 176 backedges. 0 proven. 66 refuted. 0 times theorem prover too weak. 110 trivial. 0 not checked. [2023-12-02 19:12:54,439 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1695745274] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 19:12:54,439 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1688080648] [2023-12-02 19:12:54,441 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2023-12-02 19:12:54,441 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 19:12:54,442 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 19:12:54,442 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 19:12:54,442 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 19:12:54,638 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 19:12:54,821 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1266#(and (<= 100000 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start_main_#t~mem9#1| (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) 0)) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= |ULTIMATE.start_main_~y~0#1| 1) (= |ULTIMATE.start_main_~r~0#1| 1) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) 4) |ULTIMATE.start_main_#t~mem10#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start_main_#t~mem9#1| |ULTIMATE.start_main_#t~mem10#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0) (= |ULTIMATE.start_main_~x~0#1| 0))' at error location [2023-12-02 19:12:54,821 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 19:12:54,821 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 19:12:54,822 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 26 [2023-12-02 19:12:54,822 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1899922098] [2023-12-02 19:12:54,822 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 19:12:54,822 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2023-12-02 19:12:54,823 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 19:12:54,823 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2023-12-02 19:12:54,824 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=384, Invalid=806, Unknown=0, NotChecked=0, Total=1190 [2023-12-02 19:12:54,824 INFO L87 Difference]: Start difference. First operand 42 states and 55 transitions. Second operand has 27 states, 27 states have (on average 1.3703703703703705) internal successors, (37), 26 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 19:12:55,081 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 19:12:55,081 INFO L93 Difference]: Finished difference Result 201 states and 278 transitions. [2023-12-02 19:12:55,081 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2023-12-02 19:12:55,081 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 27 states have (on average 1.3703703703703705) internal successors, (37), 26 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 40 [2023-12-02 19:12:55,081 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 19:12:55,083 INFO L225 Difference]: With dead ends: 201 [2023-12-02 19:12:55,083 INFO L226 Difference]: Without dead ends: 172 [2023-12-02 19:12:55,084 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 131 GetRequests, 98 SyntacticMatches, 0 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 336 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=384, Invalid=806, Unknown=0, NotChecked=0, Total=1190 [2023-12-02 19:12:55,085 INFO L413 NwaCegarLoop]: 6 mSDtfsCounter, 365 mSDsluCounter, 90 mSDsCounter, 0 mSdLazyCounter, 152 mSolverCounterSat, 72 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 365 SdHoareTripleChecker+Valid, 96 SdHoareTripleChecker+Invalid, 224 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 72 IncrementalHoareTripleChecker+Valid, 152 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-12-02 19:12:55,085 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [365 Valid, 96 Invalid, 224 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [72 Valid, 152 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-12-02 19:12:55,086 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 172 states. [2023-12-02 19:12:55,099 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 172 to 55. [2023-12-02 19:12:55,100 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 55 states, 54 states have (on average 1.2592592592592593) internal successors, (68), 54 states have internal predecessors, (68), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 19:12:55,100 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 68 transitions. [2023-12-02 19:12:55,101 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 68 transitions. Word has length 40 [2023-12-02 19:12:55,101 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 19:12:55,101 INFO L495 AbstractCegarLoop]: Abstraction has 55 states and 68 transitions. [2023-12-02 19:12:55,101 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 27 states have (on average 1.3703703703703705) internal successors, (37), 26 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 19:12:55,101 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 68 transitions. [2023-12-02 19:12:55,103 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 54 [2023-12-02 19:12:55,103 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 19:12:55,103 INFO L195 NwaCegarLoop]: trace histogram [24, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 19:12:55,107 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ac43b18a-ef56-4239-8ac0-6c5db8f20f2d/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2023-12-02 19:12:55,304 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ac43b18a-ef56-4239-8ac0-6c5db8f20f2d/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 19:12:55,304 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 19:12:55,304 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 19:12:55,304 INFO L85 PathProgramCache]: Analyzing trace with hash 203864468, now seen corresponding path program 5 times [2023-12-02 19:12:55,304 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 19:12:55,305 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1832555329] [2023-12-02 19:12:55,305 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 19:12:55,305 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 19:12:55,344 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 19:12:55,965 INFO L134 CoverageAnalysis]: Checked inductivity of 410 backedges. 0 proven. 300 refuted. 0 times theorem prover too weak. 110 trivial. 0 not checked. [2023-12-02 19:12:55,966 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 19:12:55,966 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1832555329] [2023-12-02 19:12:55,966 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1832555329] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 19:12:55,966 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1302575240] [2023-12-02 19:12:55,966 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-12-02 19:12:55,966 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 19:12:55,966 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ac43b18a-ef56-4239-8ac0-6c5db8f20f2d/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 19:12:55,967 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ac43b18a-ef56-4239-8ac0-6c5db8f20f2d/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 19:12:55,968 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ac43b18a-ef56-4239-8ac0-6c5db8f20f2d/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2023-12-02 19:12:56,049 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2023-12-02 19:12:56,049 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 19:12:56,050 INFO L262 TraceCheckSpWp]: Trace formula consists of 110 conjuncts, 5 conjunts are in the unsatisfiable core [2023-12-02 19:12:56,053 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 19:12:56,124 INFO L134 CoverageAnalysis]: Checked inductivity of 410 backedges. 20 proven. 0 refuted. 0 times theorem prover too weak. 390 trivial. 0 not checked. [2023-12-02 19:12:56,124 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-12-02 19:12:56,124 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1302575240] provided 1 perfect and 0 imperfect interpolant sequences [2023-12-02 19:12:56,124 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-12-02 19:12:56,124 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [26] total 30 [2023-12-02 19:12:56,125 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [553668969] [2023-12-02 19:12:56,125 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-12-02 19:12:56,125 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-12-02 19:12:56,125 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 19:12:56,126 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-12-02 19:12:56,126 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=360, Invalid=510, Unknown=0, NotChecked=0, Total=870 [2023-12-02 19:12:56,126 INFO L87 Difference]: Start difference. First operand 55 states and 68 transitions. Second operand has 5 states, 5 states have (on average 2.8) internal successors, (14), 5 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 19:12:56,189 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 19:12:56,189 INFO L93 Difference]: Finished difference Result 96 states and 136 transitions. [2023-12-02 19:12:56,189 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-12-02 19:12:56,190 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.8) internal successors, (14), 5 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 53 [2023-12-02 19:12:56,190 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 19:12:56,191 INFO L225 Difference]: With dead ends: 96 [2023-12-02 19:12:56,191 INFO L226 Difference]: Without dead ends: 89 [2023-12-02 19:12:56,192 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 79 GetRequests, 50 SyntacticMatches, 0 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 71 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=364, Invalid=566, Unknown=0, NotChecked=0, Total=930 [2023-12-02 19:12:56,192 INFO L413 NwaCegarLoop]: 6 mSDtfsCounter, 1 mSDsluCounter, 11 mSDsCounter, 0 mSdLazyCounter, 35 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 17 SdHoareTripleChecker+Invalid, 39 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 35 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-12-02 19:12:56,193 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1 Valid, 17 Invalid, 39 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 35 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-12-02 19:12:56,194 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 89 states. [2023-12-02 19:12:56,208 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 89 to 56. [2023-12-02 19:12:56,208 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 56 states, 55 states have (on average 1.2727272727272727) internal successors, (70), 55 states have internal predecessors, (70), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 19:12:56,209 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 56 states to 56 states and 70 transitions. [2023-12-02 19:12:56,209 INFO L78 Accepts]: Start accepts. Automaton has 56 states and 70 transitions. Word has length 53 [2023-12-02 19:12:56,209 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 19:12:56,209 INFO L495 AbstractCegarLoop]: Abstraction has 56 states and 70 transitions. [2023-12-02 19:12:56,210 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 2.8) internal successors, (14), 5 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 19:12:56,210 INFO L276 IsEmpty]: Start isEmpty. Operand 56 states and 70 transitions. [2023-12-02 19:12:56,211 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2023-12-02 19:12:56,211 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 19:12:56,211 INFO L195 NwaCegarLoop]: trace histogram [24, 10, 10, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 19:12:56,215 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ac43b18a-ef56-4239-8ac0-6c5db8f20f2d/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Ended with exit code 0 [2023-12-02 19:12:56,412 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ac43b18a-ef56-4239-8ac0-6c5db8f20f2d/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 19:12:56,413 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 19:12:56,413 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 19:12:56,413 INFO L85 PathProgramCache]: Analyzing trace with hash -1604428831, now seen corresponding path program 6 times [2023-12-02 19:12:56,413 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 19:12:56,413 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1085503603] [2023-12-02 19:12:56,413 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 19:12:56,413 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 19:12:56,454 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 19:12:57,086 INFO L134 CoverageAnalysis]: Checked inductivity of 421 backedges. 0 proven. 300 refuted. 0 times theorem prover too weak. 121 trivial. 0 not checked. [2023-12-02 19:12:57,086 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 19:12:57,087 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1085503603] [2023-12-02 19:12:57,087 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1085503603] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 19:12:57,087 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1453077815] [2023-12-02 19:12:57,087 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-12-02 19:12:57,087 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 19:12:57,087 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ac43b18a-ef56-4239-8ac0-6c5db8f20f2d/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 19:12:57,088 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ac43b18a-ef56-4239-8ac0-6c5db8f20f2d/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 19:12:57,088 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ac43b18a-ef56-4239-8ac0-6c5db8f20f2d/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2023-12-02 19:12:57,203 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-12-02 19:12:57,203 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 19:12:57,205 INFO L262 TraceCheckSpWp]: Trace formula consists of 351 conjuncts, 13 conjunts are in the unsatisfiable core [2023-12-02 19:12:57,208 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 19:12:57,257 INFO L134 CoverageAnalysis]: Checked inductivity of 421 backedges. 0 proven. 119 refuted. 0 times theorem prover too weak. 302 trivial. 0 not checked. [2023-12-02 19:12:57,257 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 19:12:57,549 INFO L134 CoverageAnalysis]: Checked inductivity of 421 backedges. 0 proven. 119 refuted. 0 times theorem prover too weak. 302 trivial. 0 not checked. [2023-12-02 19:12:57,549 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1453077815] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 19:12:57,549 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1299789296] [2023-12-02 19:12:57,551 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2023-12-02 19:12:57,551 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 19:12:57,551 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 19:12:57,552 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 19:12:57,552 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 19:12:57,733 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 19:12:57,993 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2536#(and (<= 100000 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start_main_#t~mem9#1| (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) 0)) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= |ULTIMATE.start_main_~y~0#1| 1) (= |ULTIMATE.start_main_~r~0#1| 1) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) 4) |ULTIMATE.start_main_#t~mem10#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start_main_#t~mem9#1| |ULTIMATE.start_main_#t~mem10#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0) (= |ULTIMATE.start_main_~x~0#1| 0))' at error location [2023-12-02 19:12:57,994 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 19:12:57,994 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 19:12:57,994 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 14, 14] total 39 [2023-12-02 19:12:57,994 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1228050843] [2023-12-02 19:12:57,994 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 19:12:57,995 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 39 states [2023-12-02 19:12:57,995 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 19:12:57,996 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 39 interpolants. [2023-12-02 19:12:57,997 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=738, Invalid=1424, Unknown=0, NotChecked=0, Total=2162 [2023-12-02 19:12:57,997 INFO L87 Difference]: Start difference. First operand 56 states and 70 transitions. Second operand has 39 states, 39 states have (on average 2.2051282051282053) internal successors, (86), 39 states have internal predecessors, (86), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 19:12:58,727 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 19:12:58,727 INFO L93 Difference]: Finished difference Result 224 states and 338 transitions. [2023-12-02 19:12:58,727 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 63 states. [2023-12-02 19:12:58,727 INFO L78 Accepts]: Start accepts. Automaton has has 39 states, 39 states have (on average 2.2051282051282053) internal successors, (86), 39 states have internal predecessors, (86), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 54 [2023-12-02 19:12:58,728 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 19:12:58,729 INFO L225 Difference]: With dead ends: 224 [2023-12-02 19:12:58,729 INFO L226 Difference]: Without dead ends: 169 [2023-12-02 19:12:58,731 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 211 GetRequests, 141 SyntacticMatches, 0 SemanticMatches, 70 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 833 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=1438, Invalid=3674, Unknown=0, NotChecked=0, Total=5112 [2023-12-02 19:12:58,732 INFO L413 NwaCegarLoop]: 6 mSDtfsCounter, 216 mSDsluCounter, 17 mSDsCounter, 0 mSdLazyCounter, 192 mSolverCounterSat, 83 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 216 SdHoareTripleChecker+Valid, 23 SdHoareTripleChecker+Invalid, 275 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 83 IncrementalHoareTripleChecker+Valid, 192 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-12-02 19:12:58,732 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [216 Valid, 23 Invalid, 275 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [83 Valid, 192 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-12-02 19:12:58,733 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 169 states. [2023-12-02 19:12:58,761 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 169 to 118. [2023-12-02 19:12:58,761 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 118 states, 117 states have (on average 1.3418803418803418) internal successors, (157), 117 states have internal predecessors, (157), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 19:12:58,762 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 118 states to 118 states and 157 transitions. [2023-12-02 19:12:58,762 INFO L78 Accepts]: Start accepts. Automaton has 118 states and 157 transitions. Word has length 54 [2023-12-02 19:12:58,762 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 19:12:58,762 INFO L495 AbstractCegarLoop]: Abstraction has 118 states and 157 transitions. [2023-12-02 19:12:58,763 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 39 states, 39 states have (on average 2.2051282051282053) internal successors, (86), 39 states have internal predecessors, (86), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 19:12:58,763 INFO L276 IsEmpty]: Start isEmpty. Operand 118 states and 157 transitions. [2023-12-02 19:12:58,764 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 117 [2023-12-02 19:12:58,764 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 19:12:58,764 INFO L195 NwaCegarLoop]: trace histogram [36, 35, 35, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 19:12:58,769 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ac43b18a-ef56-4239-8ac0-6c5db8f20f2d/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Ended with exit code 0 [2023-12-02 19:12:58,964 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ac43b18a-ef56-4239-8ac0-6c5db8f20f2d/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 19:12:58,965 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 19:12:58,965 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 19:12:58,965 INFO L85 PathProgramCache]: Analyzing trace with hash 129422118, now seen corresponding path program 7 times [2023-12-02 19:12:58,965 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 19:12:58,965 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1752493184] [2023-12-02 19:12:58,965 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 19:12:58,966 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 19:12:59,030 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 19:13:00,235 INFO L134 CoverageAnalysis]: Checked inductivity of 1962 backedges. 0 proven. 666 refuted. 0 times theorem prover too weak. 1296 trivial. 0 not checked. [2023-12-02 19:13:00,235 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 19:13:00,236 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1752493184] [2023-12-02 19:13:00,236 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1752493184] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 19:13:00,236 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1451237618] [2023-12-02 19:13:00,236 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-12-02 19:13:00,236 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 19:13:00,236 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ac43b18a-ef56-4239-8ac0-6c5db8f20f2d/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 19:13:00,237 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ac43b18a-ef56-4239-8ac0-6c5db8f20f2d/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 19:13:00,244 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ac43b18a-ef56-4239-8ac0-6c5db8f20f2d/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2023-12-02 19:13:00,412 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 19:13:00,416 INFO L262 TraceCheckSpWp]: Trace formula consists of 634 conjuncts, 38 conjunts are in the unsatisfiable core [2023-12-02 19:13:00,421 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 19:13:00,489 INFO L134 CoverageAnalysis]: Checked inductivity of 1962 backedges. 0 proven. 666 refuted. 0 times theorem prover too weak. 1296 trivial. 0 not checked. [2023-12-02 19:13:00,489 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 19:13:02,000 INFO L134 CoverageAnalysis]: Checked inductivity of 1962 backedges. 0 proven. 666 refuted. 0 times theorem prover too weak. 1296 trivial. 0 not checked. [2023-12-02 19:13:02,000 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1451237618] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 19:13:02,000 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [444868294] [2023-12-02 19:13:02,001 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2023-12-02 19:13:02,002 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 19:13:02,002 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 19:13:02,002 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 19:13:02,002 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 19:13:02,152 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 19:13:02,461 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4003#(and (<= 100000 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start_main_#t~mem9#1| (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) 0)) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= |ULTIMATE.start_main_~y~0#1| 1) (= |ULTIMATE.start_main_~r~0#1| 1) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) 4) |ULTIMATE.start_main_#t~mem10#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start_main_#t~mem9#1| |ULTIMATE.start_main_#t~mem10#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0) (= |ULTIMATE.start_main_~x~0#1| 0))' at error location [2023-12-02 19:13:02,462 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 19:13:02,462 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 19:13:02,462 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [38, 38, 38] total 76 [2023-12-02 19:13:02,462 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [892506408] [2023-12-02 19:13:02,462 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 19:13:02,463 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 77 states [2023-12-02 19:13:02,463 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 19:13:02,465 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 77 interpolants. [2023-12-02 19:13:02,467 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=2959, Invalid=4181, Unknown=0, NotChecked=0, Total=7140 [2023-12-02 19:13:02,467 INFO L87 Difference]: Start difference. First operand 118 states and 157 transitions. Second operand has 77 states, 77 states have (on average 1.12987012987013) internal successors, (87), 76 states have internal predecessors, (87), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 19:13:03,619 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 19:13:03,619 INFO L93 Difference]: Finished difference Result 655 states and 922 transitions. [2023-12-02 19:13:03,619 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 76 states. [2023-12-02 19:13:03,619 INFO L78 Accepts]: Start accepts. Automaton has has 77 states, 77 states have (on average 1.12987012987013) internal successors, (87), 76 states have internal predecessors, (87), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 116 [2023-12-02 19:13:03,619 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 19:13:03,622 INFO L225 Difference]: With dead ends: 655 [2023-12-02 19:13:03,623 INFO L226 Difference]: Without dead ends: 575 [2023-12-02 19:13:03,626 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 384 GetRequests, 301 SyntacticMatches, 0 SemanticMatches, 83 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1036 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=2959, Invalid=4181, Unknown=0, NotChecked=0, Total=7140 [2023-12-02 19:13:03,626 INFO L413 NwaCegarLoop]: 6 mSDtfsCounter, 2088 mSDsluCounter, 252 mSDsCounter, 0 mSdLazyCounter, 433 mSolverCounterSat, 326 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2088 SdHoareTripleChecker+Valid, 258 SdHoareTripleChecker+Invalid, 759 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 326 IncrementalHoareTripleChecker+Valid, 433 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2023-12-02 19:13:03,627 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [2088 Valid, 258 Invalid, 759 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [326 Valid, 433 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2023-12-02 19:13:03,627 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 575 states. [2023-12-02 19:13:03,673 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 575 to 156. [2023-12-02 19:13:03,673 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 156 states, 155 states have (on average 1.2580645161290323) internal successors, (195), 155 states have internal predecessors, (195), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 19:13:03,673 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 156 states to 156 states and 195 transitions. [2023-12-02 19:13:03,674 INFO L78 Accepts]: Start accepts. Automaton has 156 states and 195 transitions. Word has length 116 [2023-12-02 19:13:03,674 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 19:13:03,674 INFO L495 AbstractCegarLoop]: Abstraction has 156 states and 195 transitions. [2023-12-02 19:13:03,674 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 77 states, 77 states have (on average 1.12987012987013) internal successors, (87), 76 states have internal predecessors, (87), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 19:13:03,674 INFO L276 IsEmpty]: Start isEmpty. Operand 156 states and 195 transitions. [2023-12-02 19:13:03,677 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 155 [2023-12-02 19:13:03,677 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 19:13:03,677 INFO L195 NwaCegarLoop]: trace histogram [74, 35, 35, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 19:13:03,682 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ac43b18a-ef56-4239-8ac0-6c5db8f20f2d/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2023-12-02 19:13:03,877 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ac43b18a-ef56-4239-8ac0-6c5db8f20f2d/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2023-12-02 19:13:03,878 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 19:13:03,878 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 19:13:03,878 INFO L85 PathProgramCache]: Analyzing trace with hash 16597222, now seen corresponding path program 8 times [2023-12-02 19:13:03,878 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 19:13:03,878 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1735122476] [2023-12-02 19:13:03,878 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 19:13:03,878 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 19:13:03,960 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 19:13:07,197 INFO L134 CoverageAnalysis]: Checked inductivity of 4071 backedges. 0 proven. 2775 refuted. 0 times theorem prover too weak. 1296 trivial. 0 not checked. [2023-12-02 19:13:07,197 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 19:13:07,197 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1735122476] [2023-12-02 19:13:07,197 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1735122476] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 19:13:07,197 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [596828081] [2023-12-02 19:13:07,198 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-12-02 19:13:07,198 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 19:13:07,198 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ac43b18a-ef56-4239-8ac0-6c5db8f20f2d/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 19:13:07,198 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ac43b18a-ef56-4239-8ac0-6c5db8f20f2d/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 19:13:07,199 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ac43b18a-ef56-4239-8ac0-6c5db8f20f2d/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2023-12-02 19:13:07,341 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2023-12-02 19:13:07,341 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 19:13:07,343 INFO L262 TraceCheckSpWp]: Trace formula consists of 133 conjuncts, 6 conjunts are in the unsatisfiable core [2023-12-02 19:13:07,346 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 19:13:07,505 INFO L134 CoverageAnalysis]: Checked inductivity of 4071 backedges. 105 proven. 1 refuted. 0 times theorem prover too weak. 3965 trivial. 0 not checked. [2023-12-02 19:13:07,505 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 19:13:07,701 INFO L134 CoverageAnalysis]: Checked inductivity of 4071 backedges. 105 proven. 1 refuted. 0 times theorem prover too weak. 3965 trivial. 0 not checked. [2023-12-02 19:13:07,701 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [596828081] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 19:13:07,701 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [102896390] [2023-12-02 19:13:07,703 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2023-12-02 19:13:07,703 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 19:13:07,704 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 19:13:07,704 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 19:13:07,704 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 19:13:07,840 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 19:13:08,269 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '6428#(and (<= 100000 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start_main_#t~mem9#1| (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) 0)) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= |ULTIMATE.start_main_~y~0#1| 1) (= |ULTIMATE.start_main_~r~0#1| 1) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) 4) |ULTIMATE.start_main_#t~mem10#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start_main_#t~mem9#1| |ULTIMATE.start_main_#t~mem10#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0) (= |ULTIMATE.start_main_~x~0#1| 0))' at error location [2023-12-02 19:13:08,269 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 19:13:08,269 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 19:13:08,269 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [76, 6, 6] total 84 [2023-12-02 19:13:08,269 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [493134933] [2023-12-02 19:13:08,269 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 19:13:08,270 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 84 states [2023-12-02 19:13:08,270 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 19:13:08,271 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 84 interpolants. [2023-12-02 19:13:08,273 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3210, Invalid=5162, Unknown=0, NotChecked=0, Total=8372 [2023-12-02 19:13:08,273 INFO L87 Difference]: Start difference. First operand 156 states and 195 transitions. Second operand has 84 states, 84 states have (on average 1.1904761904761905) internal successors, (100), 84 states have internal predecessors, (100), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 19:13:31,974 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 19:13:31,974 INFO L93 Difference]: Finished difference Result 4021 states and 6119 transitions. [2023-12-02 19:13:31,974 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 450 states. [2023-12-02 19:13:31,974 INFO L78 Accepts]: Start accepts. Automaton has has 84 states, 84 states have (on average 1.1904761904761905) internal successors, (100), 84 states have internal predecessors, (100), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 154 [2023-12-02 19:13:31,975 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 19:13:31,992 INFO L225 Difference]: With dead ends: 4021 [2023-12-02 19:13:31,992 INFO L226 Difference]: Without dead ends: 3867 [2023-12-02 19:13:32,012 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 907 GetRequests, 446 SyntacticMatches, 0 SemanticMatches, 461 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 73871 ImplicationChecksByTransitivity, 19.5s TimeCoverageRelationStatistics Valid=45542, Invalid=168364, Unknown=0, NotChecked=0, Total=213906 [2023-12-02 19:13:32,012 INFO L413 NwaCegarLoop]: 6 mSDtfsCounter, 1894 mSDsluCounter, 34 mSDsCounter, 0 mSdLazyCounter, 428 mSolverCounterSat, 1575 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1894 SdHoareTripleChecker+Valid, 40 SdHoareTripleChecker+Invalid, 2003 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1575 IncrementalHoareTripleChecker+Valid, 428 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2023-12-02 19:13:32,012 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1894 Valid, 40 Invalid, 2003 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1575 Valid, 428 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2023-12-02 19:13:32,016 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 3867 states. [2023-12-02 19:13:32,501 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 3867 to 387. [2023-12-02 19:13:32,502 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 387 states, 386 states have (on average 1.5932642487046633) internal successors, (615), 386 states have internal predecessors, (615), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 19:13:32,502 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 387 states to 387 states and 615 transitions. [2023-12-02 19:13:32,503 INFO L78 Accepts]: Start accepts. Automaton has 387 states and 615 transitions. Word has length 154 [2023-12-02 19:13:32,503 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 19:13:32,503 INFO L495 AbstractCegarLoop]: Abstraction has 387 states and 615 transitions. [2023-12-02 19:13:32,503 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 84 states, 84 states have (on average 1.1904761904761905) internal successors, (100), 84 states have internal predecessors, (100), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 19:13:32,503 INFO L276 IsEmpty]: Start isEmpty. Operand 387 states and 615 transitions. [2023-12-02 19:13:32,511 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 386 [2023-12-02 19:13:32,511 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 19:13:32,511 INFO L195 NwaCegarLoop]: trace histogram [151, 76, 75, 75, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 19:13:32,517 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ac43b18a-ef56-4239-8ac0-6c5db8f20f2d/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Ended with exit code 0 [2023-12-02 19:13:32,712 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ac43b18a-ef56-4239-8ac0-6c5db8f20f2d/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 19:13:32,712 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 19:13:32,713 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 19:13:32,713 INFO L85 PathProgramCache]: Analyzing trace with hash -1916902905, now seen corresponding path program 9 times [2023-12-02 19:13:32,713 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 19:13:32,713 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1424783298] [2023-12-02 19:13:32,713 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 19:13:32,713 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 19:13:32,906 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 19:13:38,558 INFO L134 CoverageAnalysis]: Checked inductivity of 31201 backedges. 0 proven. 2926 refuted. 0 times theorem prover too weak. 28275 trivial. 0 not checked. [2023-12-02 19:13:38,558 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 19:13:38,558 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1424783298] [2023-12-02 19:13:38,558 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1424783298] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 19:13:38,558 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1757028330] [2023-12-02 19:13:38,558 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-12-02 19:13:38,559 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 19:13:38,559 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ac43b18a-ef56-4239-8ac0-6c5db8f20f2d/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 19:13:38,559 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ac43b18a-ef56-4239-8ac0-6c5db8f20f2d/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 19:13:38,560 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ac43b18a-ef56-4239-8ac0-6c5db8f20f2d/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2023-12-02 19:13:39,703 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-12-02 19:13:39,703 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 19:13:39,715 INFO L262 TraceCheckSpWp]: Trace formula consists of 2019 conjuncts, 78 conjunts are in the unsatisfiable core [2023-12-02 19:13:39,723 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 19:13:40,049 INFO L134 CoverageAnalysis]: Checked inductivity of 31201 backedges. 0 proven. 28045 refuted. 0 times theorem prover too weak. 3156 trivial. 0 not checked. [2023-12-02 19:13:40,049 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 19:13:45,727 INFO L134 CoverageAnalysis]: Checked inductivity of 31201 backedges. 0 proven. 28045 refuted. 0 times theorem prover too weak. 3156 trivial. 0 not checked. [2023-12-02 19:13:45,728 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1757028330] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 19:13:45,728 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1536022119] [2023-12-02 19:13:45,730 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2023-12-02 19:13:45,730 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 19:13:45,730 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 19:13:45,730 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 19:13:45,730 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 19:13:45,853 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 19:13:46,313 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '18364#(and (<= 100000 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start_main_#t~mem9#1| (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) 0)) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= |ULTIMATE.start_main_~y~0#1| 1) (= |ULTIMATE.start_main_~r~0#1| 1) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) 4) |ULTIMATE.start_main_#t~mem10#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start_main_#t~mem9#1| |ULTIMATE.start_main_#t~mem10#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0) (= |ULTIMATE.start_main_~x~0#1| 0))' at error location [2023-12-02 19:13:46,313 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 19:13:46,313 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 19:13:46,313 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [78, 79, 79] total 156 [2023-12-02 19:13:46,314 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2113054974] [2023-12-02 19:13:46,314 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 19:13:46,315 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 156 states [2023-12-02 19:13:46,315 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 19:13:46,318 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 156 interpolants. [2023-12-02 19:13:46,320 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11970, Invalid=14762, Unknown=0, NotChecked=0, Total=26732 [2023-12-02 19:13:46,320 INFO L87 Difference]: Start difference. First operand 387 states and 615 transitions. Second operand has 156 states, 156 states have (on average 3.4871794871794872) internal successors, (544), 156 states have internal predecessors, (544), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 19:14:30,604 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 19:14:30,604 INFO L93 Difference]: Finished difference Result 34751 states and 60711 transitions. [2023-12-02 19:14:30,604 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 232 states. [2023-12-02 19:14:30,605 INFO L78 Accepts]: Start accepts. Automaton has has 156 states, 156 states have (on average 3.4871794871794872) internal successors, (544), 156 states have internal predecessors, (544), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 385 [2023-12-02 19:14:30,605 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 19:14:30,733 INFO L225 Difference]: With dead ends: 34751 [2023-12-02 19:14:30,733 INFO L226 Difference]: Without dead ends: 34365 [2023-12-02 19:14:30,745 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1308 GetRequests, 1069 SyntacticMatches, 0 SemanticMatches, 239 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7905 ImplicationChecksByTransitivity, 11.1s TimeCoverageRelationStatistics Valid=18130, Invalid=39710, Unknown=0, NotChecked=0, Total=57840 [2023-12-02 19:14:30,746 INFO L413 NwaCegarLoop]: 6 mSDtfsCounter, 319 mSDsluCounter, 41 mSDsCounter, 0 mSdLazyCounter, 721 mSolverCounterSat, 388 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 319 SdHoareTripleChecker+Valid, 47 SdHoareTripleChecker+Invalid, 1109 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 388 IncrementalHoareTripleChecker+Valid, 721 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2023-12-02 19:14:30,746 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [319 Valid, 47 Invalid, 1109 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [388 Valid, 721 Invalid, 0 Unknown, 0 Unchecked, 1.0s Time] [2023-12-02 19:14:30,779 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34365 states. [2023-12-02 19:14:33,929 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34365 to 618. [2023-12-02 19:14:33,931 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 618 states, 617 states have (on average 1.4959481361426257) internal successors, (923), 617 states have internal predecessors, (923), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 19:14:33,932 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 618 states to 618 states and 923 transitions. [2023-12-02 19:14:33,932 INFO L78 Accepts]: Start accepts. Automaton has 618 states and 923 transitions. Word has length 385 [2023-12-02 19:14:33,932 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 19:14:33,932 INFO L495 AbstractCegarLoop]: Abstraction has 618 states and 923 transitions. [2023-12-02 19:14:33,933 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 156 states, 156 states have (on average 3.4871794871794872) internal successors, (544), 156 states have internal predecessors, (544), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 19:14:33,933 INFO L276 IsEmpty]: Start isEmpty. Operand 618 states and 923 transitions. [2023-12-02 19:14:33,943 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 617 [2023-12-02 19:14:33,943 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 19:14:33,943 INFO L195 NwaCegarLoop]: trace histogram [153, 152, 152, 151, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 19:14:33,951 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ac43b18a-ef56-4239-8ac0-6c5db8f20f2d/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Ended with exit code 0 [2023-12-02 19:14:34,143 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ac43b18a-ef56-4239-8ac0-6c5db8f20f2d/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2023-12-02 19:14:34,144 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 19:14:34,144 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 19:14:34,144 INFO L85 PathProgramCache]: Analyzing trace with hash -387998428, now seen corresponding path program 10 times [2023-12-02 19:14:34,144 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 19:14:34,144 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [530094374] [2023-12-02 19:14:34,144 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 19:14:34,145 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 19:14:34,617 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 19:14:52,301 INFO L134 CoverageAnalysis]: Checked inductivity of 69162 backedges. 0 proven. 11781 refuted. 0 times theorem prover too weak. 57381 trivial. 0 not checked. [2023-12-02 19:14:52,302 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 19:14:52,302 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [530094374] [2023-12-02 19:14:52,302 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [530094374] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 19:14:52,302 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1268381430] [2023-12-02 19:14:52,302 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-12-02 19:14:52,302 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 19:14:52,302 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ac43b18a-ef56-4239-8ac0-6c5db8f20f2d/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 19:14:52,303 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ac43b18a-ef56-4239-8ac0-6c5db8f20f2d/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 19:14:52,304 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ac43b18a-ef56-4239-8ac0-6c5db8f20f2d/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2023-12-02 19:14:52,947 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 19:14:52,963 INFO L262 TraceCheckSpWp]: Trace formula consists of 3251 conjuncts, 155 conjunts are in the unsatisfiable core [2023-12-02 19:14:52,975 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 19:14:53,158 INFO L134 CoverageAnalysis]: Checked inductivity of 69162 backedges. 0 proven. 11781 refuted. 0 times theorem prover too weak. 57381 trivial. 0 not checked. [2023-12-02 19:14:53,158 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 19:15:15,099 INFO L134 CoverageAnalysis]: Checked inductivity of 69162 backedges. 0 proven. 11781 refuted. 0 times theorem prover too weak. 57381 trivial. 0 not checked. [2023-12-02 19:15:15,099 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1268381430] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 19:15:15,099 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1651007049] [2023-12-02 19:15:15,102 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2023-12-02 19:15:15,102 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 19:15:15,102 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 19:15:15,102 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 19:15:15,102 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 19:15:15,238 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 19:15:15,947 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '93171#(and (<= 100000 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start_main_#t~mem9#1| (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) 0)) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= |ULTIMATE.start_main_~y~0#1| 1) (= |ULTIMATE.start_main_~r~0#1| 1) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) 4) |ULTIMATE.start_main_#t~mem10#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start_main_#t~mem9#1| |ULTIMATE.start_main_#t~mem10#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0) (= |ULTIMATE.start_main_~x~0#1| 0))' at error location [2023-12-02 19:15:15,947 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 19:15:15,947 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 19:15:15,948 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [155, 155, 155] total 310 [2023-12-02 19:15:15,948 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1623224227] [2023-12-02 19:15:15,948 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 19:15:15,949 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 311 states [2023-12-02 19:15:15,949 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 19:15:15,957 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 311 interpolants. [2023-12-02 19:15:15,965 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=48238, Invalid=53204, Unknown=0, NotChecked=0, Total=101442 [2023-12-02 19:15:15,966 INFO L87 Difference]: Start difference. First operand 618 states and 923 transitions. Second operand has 311 states, 311 states have (on average 1.0321543408360128) internal successors, (321), 310 states have internal predecessors, (321), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 19:19:17,230 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-12-02 19:19:17,230 INFO L93 Difference]: Finished difference Result 59544 states and 103441 transitions. [2023-12-02 19:19:17,230 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 310 states. [2023-12-02 19:19:17,231 INFO L78 Accepts]: Start accepts. Automaton has has 311 states, 311 states have (on average 1.0321543408360128) internal successors, (321), 310 states have internal predecessors, (321), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 616 [2023-12-02 19:19:17,231 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-12-02 19:19:17,351 INFO L225 Difference]: With dead ends: 59544 [2023-12-02 19:19:17,351 INFO L226 Difference]: Without dead ends: 59081 [2023-12-02 19:19:17,374 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2001 GetRequests, 1684 SyntacticMatches, 0 SemanticMatches, 317 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4312 ImplicationChecksByTransitivity, 29.4s TimeCoverageRelationStatistics Valid=48238, Invalid=53204, Unknown=0, NotChecked=0, Total=101442 [2023-12-02 19:19:17,375 INFO L413 NwaCegarLoop]: 6 mSDtfsCounter, 8704 mSDsluCounter, 954 mSDsCounter, 0 mSdLazyCounter, 1721 mSolverCounterSat, 1537 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8704 SdHoareTripleChecker+Valid, 960 SdHoareTripleChecker+Invalid, 3258 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 1537 IncrementalHoareTripleChecker+Valid, 1721 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.8s IncrementalHoareTripleChecker+Time [2023-12-02 19:19:17,375 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [8704 Valid, 960 Invalid, 3258 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [1537 Valid, 1721 Invalid, 0 Unknown, 0 Unchecked, 2.8s Time] [2023-12-02 19:19:17,426 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59081 states. [2023-12-02 19:19:22,024 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59081 to 773. [2023-12-02 19:19:22,025 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 773 states, 772 states have (on average 1.3963730569948187) internal successors, (1078), 772 states have internal predecessors, (1078), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 19:19:22,026 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 773 states to 773 states and 1078 transitions. [2023-12-02 19:19:22,027 INFO L78 Accepts]: Start accepts. Automaton has 773 states and 1078 transitions. Word has length 616 [2023-12-02 19:19:22,027 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-12-02 19:19:22,027 INFO L495 AbstractCegarLoop]: Abstraction has 773 states and 1078 transitions. [2023-12-02 19:19:22,028 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 311 states, 311 states have (on average 1.0321543408360128) internal successors, (321), 310 states have internal predecessors, (321), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-12-02 19:19:22,028 INFO L276 IsEmpty]: Start isEmpty. Operand 773 states and 1078 transitions. [2023-12-02 19:19:22,035 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 772 [2023-12-02 19:19:22,035 INFO L187 NwaCegarLoop]: Found error trace [2023-12-02 19:19:22,035 INFO L195 NwaCegarLoop]: trace histogram [308, 152, 152, 151, 1, 1, 1, 1, 1, 1, 1, 1] [2023-12-02 19:19:22,044 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ac43b18a-ef56-4239-8ac0-6c5db8f20f2d/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2023-12-02 19:19:22,236 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ac43b18a-ef56-4239-8ac0-6c5db8f20f2d/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2023-12-02 19:19:22,236 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-12-02 19:19:22,236 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-12-02 19:19:22,237 INFO L85 PathProgramCache]: Analyzing trace with hash 827624702, now seen corresponding path program 11 times [2023-12-02 19:19:22,237 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-12-02 19:19:22,237 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2029906512] [2023-12-02 19:19:22,237 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-12-02 19:19:22,237 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-12-02 19:19:23,124 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-12-02 19:20:31,079 INFO L134 CoverageAnalysis]: Checked inductivity of 104967 backedges. 0 proven. 47586 refuted. 0 times theorem prover too weak. 57381 trivial. 0 not checked. [2023-12-02 19:20:31,079 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-12-02 19:20:31,080 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2029906512] [2023-12-02 19:20:31,080 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2029906512] provided 0 perfect and 1 imperfect interpolant sequences [2023-12-02 19:20:31,080 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1467659422] [2023-12-02 19:20:31,080 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-12-02 19:20:31,080 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-12-02 19:20:31,080 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ac43b18a-ef56-4239-8ac0-6c5db8f20f2d/bin/utaipan-verify-nQ1chXbOIh/z3 [2023-12-02 19:20:31,081 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ac43b18a-ef56-4239-8ac0-6c5db8f20f2d/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-12-02 19:20:31,082 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_ac43b18a-ef56-4239-8ac0-6c5db8f20f2d/bin/utaipan-verify-nQ1chXbOIh/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2023-12-02 19:20:31,556 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2023-12-02 19:20:31,556 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-12-02 19:20:31,559 INFO L262 TraceCheckSpWp]: Trace formula consists of 173 conjuncts, 9 conjunts are in the unsatisfiable core [2023-12-02 19:20:31,569 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-12-02 19:20:32,421 INFO L134 CoverageAnalysis]: Checked inductivity of 104967 backedges. 1642 proven. 10 refuted. 0 times theorem prover too weak. 103315 trivial. 0 not checked. [2023-12-02 19:20:32,421 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-12-02 19:20:33,786 INFO L134 CoverageAnalysis]: Checked inductivity of 104967 backedges. 1642 proven. 10 refuted. 0 times theorem prover too weak. 103315 trivial. 0 not checked. [2023-12-02 19:20:33,786 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1467659422] provided 0 perfect and 2 imperfect interpolant sequences [2023-12-02 19:20:33,786 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1834808392] [2023-12-02 19:20:33,788 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2023-12-02 19:20:33,788 INFO L166 IcfgInterpreter]: Building call graph [2023-12-02 19:20:33,788 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-12-02 19:20:33,789 INFO L176 IcfgInterpreter]: Starting interpretation [2023-12-02 19:20:33,789 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-12-02 19:20:33,917 INFO L180 IcfgInterpreter]: Interpretation finished [2023-12-02 19:20:35,376 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '217965#(and (<= 100000 |ULTIMATE.start_main_~i~0#1|) (= |ULTIMATE.start_main_#t~mem9#1| (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) 0)) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (= |ULTIMATE.start_main_~y~0#1| 1) (= |ULTIMATE.start_main_~r~0#1| 1) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) 4) |ULTIMATE.start_main_#t~mem10#1|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start_main_#t~mem9#1| |ULTIMATE.start_main_#t~mem10#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0) (= |ULTIMATE.start_main_~x~0#1| 0))' at error location [2023-12-02 19:20:35,376 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-12-02 19:20:35,376 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-12-02 19:20:35,377 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [310, 9, 9] total 324 [2023-12-02 19:20:35,377 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [609984305] [2023-12-02 19:20:35,378 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-12-02 19:20:35,379 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 324 states [2023-12-02 19:20:35,379 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-12-02 19:20:35,387 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 324 interpolants. [2023-12-02 19:20:35,393 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=50172, Invalid=59720, Unknown=0, NotChecked=0, Total=109892 [2023-12-02 19:20:35,393 INFO L87 Difference]: Start difference. First operand 773 states and 1078 transitions. Second operand has 324 states, 324 states have (on average 1.0493827160493827) internal successors, (340), 324 states have internal predecessors, (340), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0)