./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/loop-simple/nested_4.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 30e01a73 Calling Ultimate with: /usr/lib/jvm/java-11-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6fb3703a-c2e1-4187-8aff-2d8a6efdcb24/bin/utaipan-verify-mE87zJ7Ire/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6fb3703a-c2e1-4187-8aff-2d8a6efdcb24/bin/utaipan-verify-mE87zJ7Ire/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6fb3703a-c2e1-4187-8aff-2d8a6efdcb24/bin/utaipan-verify-mE87zJ7Ire/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6fb3703a-c2e1-4187-8aff-2d8a6efdcb24/bin/utaipan-verify-mE87zJ7Ire/config/TaipanReach.xml -i ../../sv-benchmarks/c/loop-simple/nested_4.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6fb3703a-c2e1-4187-8aff-2d8a6efdcb24/bin/utaipan-verify-mE87zJ7Ire/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6fb3703a-c2e1-4187-8aff-2d8a6efdcb24/bin/utaipan-verify-mE87zJ7Ire --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 fcf77da5263056f8d62c4caf3b92919690d80ef4ff864a75d0d8d1eec10bdccf --- Real Ultimate output --- This is Ultimate 0.2.3-dev-30e01a7 [2023-11-23 21:18:39,327 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-11-23 21:18:39,440 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6fb3703a-c2e1-4187-8aff-2d8a6efdcb24/bin/utaipan-verify-mE87zJ7Ire/config/svcomp-Reach-32bit-Taipan_Default.epf [2023-11-23 21:18:39,454 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-11-23 21:18:39,455 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-11-23 21:18:39,494 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-11-23 21:18:39,495 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-11-23 21:18:39,495 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-11-23 21:18:39,496 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-11-23 21:18:39,501 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-11-23 21:18:39,502 INFO L153 SettingsManager]: * User list type=DISABLED [2023-11-23 21:18:39,502 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-11-23 21:18:39,502 INFO L153 SettingsManager]: * Explicit value domain=true [2023-11-23 21:18:39,504 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-11-23 21:18:39,505 INFO L153 SettingsManager]: * Octagon Domain=false [2023-11-23 21:18:39,505 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-11-23 21:18:39,505 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-11-23 21:18:39,506 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-11-23 21:18:39,506 INFO L153 SettingsManager]: * Interval Domain=false [2023-11-23 21:18:39,507 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-11-23 21:18:39,507 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-11-23 21:18:39,508 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2023-11-23 21:18:39,509 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-11-23 21:18:39,509 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-11-23 21:18:39,509 INFO L153 SettingsManager]: * sizeof long=4 [2023-11-23 21:18:39,510 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-11-23 21:18:39,510 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-11-23 21:18:39,511 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-11-23 21:18:39,511 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-11-23 21:18:39,511 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-11-23 21:18:39,513 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-11-23 21:18:39,513 INFO L153 SettingsManager]: * sizeof long double=12 [2023-11-23 21:18:39,513 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2023-11-23 21:18:39,513 INFO L153 SettingsManager]: * Use constant arrays=true [2023-11-23 21:18:39,514 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-11-23 21:18:39,514 INFO L153 SettingsManager]: * Only consider context switches at boundaries of atomic blocks=true [2023-11-23 21:18:39,514 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-11-23 21:18:39,514 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-23 21:18:39,515 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-11-23 21:18:39,515 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-11-23 21:18:39,515 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2023-11-23 21:18:39,516 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-11-23 21:18:39,516 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-11-23 21:18:39,516 INFO L153 SettingsManager]: * Apply one-shot large block encoding in concurrent analysis=false [2023-11-23 21:18:39,517 INFO L153 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-11-23 21:18:39,517 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-11-23 21:18:39,517 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-11-23 21:18:39,517 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_6fb3703a-c2e1-4187-8aff-2d8a6efdcb24/bin/utaipan-verify-mE87zJ7Ire/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6fb3703a-c2e1-4187-8aff-2d8a6efdcb24/bin/utaipan-verify-mE87zJ7Ire Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> fcf77da5263056f8d62c4caf3b92919690d80ef4ff864a75d0d8d1eec10bdccf [2023-11-23 21:18:39,828 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-11-23 21:18:39,865 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-11-23 21:18:39,870 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-11-23 21:18:39,872 INFO L270 PluginConnector]: Initializing CDTParser... [2023-11-23 21:18:39,873 INFO L274 PluginConnector]: CDTParser initialized [2023-11-23 21:18:39,874 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6fb3703a-c2e1-4187-8aff-2d8a6efdcb24/bin/utaipan-verify-mE87zJ7Ire/../../sv-benchmarks/c/loop-simple/nested_4.c [2023-11-23 21:18:43,212 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-11-23 21:18:43,423 INFO L384 CDTParser]: Found 1 translation units. [2023-11-23 21:18:43,424 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6fb3703a-c2e1-4187-8aff-2d8a6efdcb24/sv-benchmarks/c/loop-simple/nested_4.c [2023-11-23 21:18:43,431 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6fb3703a-c2e1-4187-8aff-2d8a6efdcb24/bin/utaipan-verify-mE87zJ7Ire/data/b653d034b/3bcd6c3c1f2547039ff2f343dc719666/FLAGb7f1c9136 [2023-11-23 21:18:43,448 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6fb3703a-c2e1-4187-8aff-2d8a6efdcb24/bin/utaipan-verify-mE87zJ7Ire/data/b653d034b/3bcd6c3c1f2547039ff2f343dc719666 [2023-11-23 21:18:43,451 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-11-23 21:18:43,453 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-11-23 21:18:43,455 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-11-23 21:18:43,455 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-11-23 21:18:43,473 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-11-23 21:18:43,477 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 09:18:43" (1/1) ... [2023-11-23 21:18:43,478 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@2fb38c6f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:18:43, skipping insertion in model container [2023-11-23 21:18:43,479 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 09:18:43" (1/1) ... [2023-11-23 21:18:43,506 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-11-23 21:18:43,687 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_6fb3703a-c2e1-4187-8aff-2d8a6efdcb24/sv-benchmarks/c/loop-simple/nested_4.c[841,854] [2023-11-23 21:18:43,693 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-23 21:18:43,707 INFO L202 MainTranslator]: Completed pre-run [2023-11-23 21:18:43,726 WARN L240 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6fb3703a-c2e1-4187-8aff-2d8a6efdcb24/sv-benchmarks/c/loop-simple/nested_4.c[841,854] [2023-11-23 21:18:43,727 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-23 21:18:43,743 INFO L206 MainTranslator]: Completed translation [2023-11-23 21:18:43,744 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:18:43 WrapperNode [2023-11-23 21:18:43,744 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-11-23 21:18:43,746 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-11-23 21:18:43,747 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-11-23 21:18:43,747 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-11-23 21:18:43,756 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:18:43" (1/1) ... [2023-11-23 21:18:43,766 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:18:43" (1/1) ... [2023-11-23 21:18:43,785 INFO L138 Inliner]: procedures = 10, calls = 7, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 49 [2023-11-23 21:18:43,786 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-11-23 21:18:43,787 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-11-23 21:18:43,787 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-11-23 21:18:43,787 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-11-23 21:18:43,798 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:18:43" (1/1) ... [2023-11-23 21:18:43,799 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:18:43" (1/1) ... [2023-11-23 21:18:43,801 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:18:43" (1/1) ... [2023-11-23 21:18:43,802 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:18:43" (1/1) ... [2023-11-23 21:18:43,816 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:18:43" (1/1) ... [2023-11-23 21:18:43,823 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:18:43" (1/1) ... [2023-11-23 21:18:43,824 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:18:43" (1/1) ... [2023-11-23 21:18:43,825 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:18:43" (1/1) ... [2023-11-23 21:18:43,827 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-11-23 21:18:43,829 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-11-23 21:18:43,829 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-11-23 21:18:43,829 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-11-23 21:18:43,830 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:18:43" (1/1) ... [2023-11-23 21:18:43,839 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-23 21:18:43,855 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6fb3703a-c2e1-4187-8aff-2d8a6efdcb24/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:18:43,870 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6fb3703a-c2e1-4187-8aff-2d8a6efdcb24/bin/utaipan-verify-mE87zJ7Ire/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-11-23 21:18:43,874 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6fb3703a-c2e1-4187-8aff-2d8a6efdcb24/bin/utaipan-verify-mE87zJ7Ire/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-11-23 21:18:43,908 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-11-23 21:18:43,908 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-11-23 21:18:43,908 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-11-23 21:18:43,909 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-11-23 21:18:43,974 INFO L241 CfgBuilder]: Building ICFG [2023-11-23 21:18:43,977 INFO L267 CfgBuilder]: Building CFG for each procedure with an implementation [2023-11-23 21:18:44,115 INFO L282 CfgBuilder]: Performing block encoding [2023-11-23 21:18:44,180 INFO L304 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-11-23 21:18:44,180 INFO L309 CfgBuilder]: Removed 4 assume(true) statements. [2023-11-23 21:18:44,182 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 09:18:44 BoogieIcfgContainer [2023-11-23 21:18:44,183 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-11-23 21:18:44,186 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-11-23 21:18:44,192 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-11-23 21:18:44,197 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-11-23 21:18:44,198 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.11 09:18:43" (1/3) ... [2023-11-23 21:18:44,200 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@264dfc41 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 09:18:44, skipping insertion in model container [2023-11-23 21:18:44,200 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:18:43" (2/3) ... [2023-11-23 21:18:44,202 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@264dfc41 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 09:18:44, skipping insertion in model container [2023-11-23 21:18:44,204 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 09:18:44" (3/3) ... [2023-11-23 21:18:44,206 INFO L112 eAbstractionObserver]: Analyzing ICFG nested_4.c [2023-11-23 21:18:44,228 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-11-23 21:18:44,228 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-11-23 21:18:44,280 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-11-23 21:18:44,289 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;@7cccbb69, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-11-23 21:18:44,290 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-11-23 21:18:44,294 INFO L276 IsEmpty]: Start isEmpty. Operand has 10 states, 8 states have (on average 1.75) internal successors, (14), 9 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) [2023-11-23 21:18:44,301 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 5 [2023-11-23 21:18:44,301 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:18:44,302 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1] [2023-11-23 21:18:44,303 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:18:44,309 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:18:44,309 INFO L85 PathProgramCache]: Analyzing trace with hash 2930857, now seen corresponding path program 1 times [2023-11-23 21:18:44,322 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:18:44,322 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2033095344] [2023-11-23 21:18:44,323 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:18:44,323 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:18:44,435 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:18:44,544 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 21:18:44,544 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:18:44,545 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2033095344] [2023-11-23 21:18:44,546 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2033095344] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 21:18:44,546 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-23 21:18:44,547 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-11-23 21:18:44,549 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [764420674] [2023-11-23 21:18:44,550 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:18:44,556 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-23 21:18:44,556 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:18:44,590 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-23 21:18:44,590 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-23 21:18:44,593 INFO L87 Difference]: Start difference. First operand has 10 states, 8 states have (on average 1.75) internal successors, (14), 9 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) Second operand has 3 states, 3 states have (on average 1.3333333333333333) internal successors, (4), 2 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:18:44,653 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:18:44,653 INFO L93 Difference]: Finished difference Result 19 states and 27 transitions. [2023-11-23 21:18:44,655 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-23 21:18:44,657 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 1.3333333333333333) internal successors, (4), 2 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 4 [2023-11-23 21:18:44,657 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:18:44,667 INFO L225 Difference]: With dead ends: 19 [2023-11-23 21:18:44,667 INFO L226 Difference]: Without dead ends: 12 [2023-11-23 21:18:44,671 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-23 21:18:44,676 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 6 mSDsluCounter, 3 mSDsCounter, 0 mSdLazyCounter, 17 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 8 SdHoareTripleChecker+Invalid, 17 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 17 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-23 21:18:44,678 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [6 Valid, 8 Invalid, 17 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 17 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-23 21:18:44,701 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2023-11-23 21:18:44,716 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 9. [2023-11-23 21:18:44,718 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 9 states, 8 states have (on average 1.5) internal successors, (12), 8 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:18:44,719 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 9 states to 9 states and 12 transitions. [2023-11-23 21:18:44,721 INFO L78 Accepts]: Start accepts. Automaton has 9 states and 12 transitions. Word has length 4 [2023-11-23 21:18:44,721 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:18:44,722 INFO L495 AbstractCegarLoop]: Abstraction has 9 states and 12 transitions. [2023-11-23 21:18:44,722 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 1.3333333333333333) internal successors, (4), 2 states have internal predecessors, (4), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:18:44,723 INFO L276 IsEmpty]: Start isEmpty. Operand 9 states and 12 transitions. [2023-11-23 21:18:44,723 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2023-11-23 21:18:44,723 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:18:44,723 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2023-11-23 21:18:44,724 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-11-23 21:18:44,724 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:18:44,725 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:18:44,725 INFO L85 PathProgramCache]: Analyzing trace with hash -1535147508, now seen corresponding path program 1 times [2023-11-23 21:18:44,726 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:18:44,726 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [489293138] [2023-11-23 21:18:44,726 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:18:44,727 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:18:44,763 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:18:44,844 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 21:18:44,845 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:18:44,845 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [489293138] [2023-11-23 21:18:44,845 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [489293138] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 21:18:44,846 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-23 21:18:44,846 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-11-23 21:18:44,846 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1422932671] [2023-11-23 21:18:44,846 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:18:44,848 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-23 21:18:44,848 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:18:44,849 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-23 21:18:44,849 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-23 21:18:44,850 INFO L87 Difference]: Start difference. First operand 9 states and 12 transitions. Second operand has 3 states, 3 states have (on average 2.0) internal successors, (6), 3 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:18:44,882 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:18:44,882 INFO L93 Difference]: Finished difference Result 19 states and 28 transitions. [2023-11-23 21:18:44,883 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-23 21:18:44,883 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.0) internal successors, (6), 3 states have internal predecessors, (6), 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 6 [2023-11-23 21:18:44,883 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:18:44,884 INFO L225 Difference]: With dead ends: 19 [2023-11-23 21:18:44,884 INFO L226 Difference]: Without dead ends: 12 [2023-11-23 21:18:44,885 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-23 21:18:44,887 INFO L413 NwaCegarLoop]: 4 mSDtfsCounter, 4 mSDsluCounter, 2 mSDsCounter, 0 mSdLazyCounter, 15 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4 SdHoareTripleChecker+Valid, 6 SdHoareTripleChecker+Invalid, 15 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 15 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-23 21:18:44,888 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [4 Valid, 6 Invalid, 15 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 15 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-23 21:18:44,889 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2023-11-23 21:18:44,892 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 10. [2023-11-23 21:18:44,892 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 10 states, 9 states have (on average 1.4444444444444444) internal successors, (13), 9 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:18:44,893 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 10 states to 10 states and 13 transitions. [2023-11-23 21:18:44,893 INFO L78 Accepts]: Start accepts. Automaton has 10 states and 13 transitions. Word has length 6 [2023-11-23 21:18:44,893 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:18:44,893 INFO L495 AbstractCegarLoop]: Abstraction has 10 states and 13 transitions. [2023-11-23 21:18:44,894 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 2.0) internal successors, (6), 3 states have internal predecessors, (6), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:18:44,894 INFO L276 IsEmpty]: Start isEmpty. Operand 10 states and 13 transitions. [2023-11-23 21:18:44,894 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2023-11-23 21:18:44,895 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:18:44,895 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:18:44,895 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2023-11-23 21:18:44,896 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:18:44,897 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:18:44,897 INFO L85 PathProgramCache]: Analyzing trace with hash 677021188, now seen corresponding path program 1 times [2023-11-23 21:18:44,897 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:18:44,897 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [150822935] [2023-11-23 21:18:44,898 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:18:44,898 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:18:44,913 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:18:44,969 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 21:18:44,970 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:18:44,970 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [150822935] [2023-11-23 21:18:44,970 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [150822935] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 21:18:44,971 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-23 21:18:44,971 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-11-23 21:18:44,971 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [955565118] [2023-11-23 21:18:44,972 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:18:44,972 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-23 21:18:44,972 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:18:44,973 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-23 21:18:44,973 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-23 21:18:44,974 INFO L87 Difference]: Start difference. First operand 10 states and 13 transitions. Second operand has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 3 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:18:45,028 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:18:45,029 INFO L93 Difference]: Finished difference Result 20 states and 28 transitions. [2023-11-23 21:18:45,029 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-23 21:18:45,030 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 3 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 8 [2023-11-23 21:18:45,035 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:18:45,036 INFO L225 Difference]: With dead ends: 20 [2023-11-23 21:18:45,036 INFO L226 Difference]: Without dead ends: 12 [2023-11-23 21:18:45,037 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-23 21:18:45,040 INFO L413 NwaCegarLoop]: 4 mSDtfsCounter, 2 mSDsluCounter, 2 mSDsCounter, 0 mSdLazyCounter, 15 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 6 SdHoareTripleChecker+Invalid, 15 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 15 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-23 21:18:45,045 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [2 Valid, 6 Invalid, 15 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 15 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-23 21:18:45,047 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2023-11-23 21:18:45,054 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 11. [2023-11-23 21:18:45,054 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 11 states, 10 states have (on average 1.4) internal successors, (14), 10 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) [2023-11-23 21:18:45,057 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11 states to 11 states and 14 transitions. [2023-11-23 21:18:45,058 INFO L78 Accepts]: Start accepts. Automaton has 11 states and 14 transitions. Word has length 8 [2023-11-23 21:18:45,058 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:18:45,059 INFO L495 AbstractCegarLoop]: Abstraction has 11 states and 14 transitions. [2023-11-23 21:18:45,059 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 3 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:18:45,061 INFO L276 IsEmpty]: Start isEmpty. Operand 11 states and 14 transitions. [2023-11-23 21:18:45,061 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2023-11-23 21:18:45,062 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:18:45,063 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:18:45,063 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2023-11-23 21:18:45,064 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:18:45,066 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:18:45,074 INFO L85 PathProgramCache]: Analyzing trace with hash -1923057799, now seen corresponding path program 1 times [2023-11-23 21:18:45,074 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:18:45,075 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [726011547] [2023-11-23 21:18:45,075 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:18:45,104 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:18:45,137 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:18:45,189 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 21:18:45,189 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:18:45,190 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [726011547] [2023-11-23 21:18:45,190 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [726011547] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 21:18:45,190 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-23 21:18:45,190 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-11-23 21:18:45,191 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1083989271] [2023-11-23 21:18:45,191 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:18:45,192 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-23 21:18:45,192 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:18:45,193 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-23 21:18:45,193 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-23 21:18:45,193 INFO L87 Difference]: Start difference. First operand 11 states and 14 transitions. Second operand has 3 states, 3 states have (on average 3.3333333333333335) internal successors, (10), 3 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:18:45,216 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:18:45,217 INFO L93 Difference]: Finished difference Result 21 states and 28 transitions. [2023-11-23 21:18:45,217 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-23 21:18:45,218 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 3.3333333333333335) internal successors, (10), 3 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 10 [2023-11-23 21:18:45,218 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:18:45,218 INFO L225 Difference]: With dead ends: 21 [2023-11-23 21:18:45,219 INFO L226 Difference]: Without dead ends: 12 [2023-11-23 21:18:45,219 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 3 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-23 21:18:45,221 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 0 mSDsluCounter, 3 mSDsCounter, 0 mSdLazyCounter, 13 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 8 SdHoareTripleChecker+Invalid, 13 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 13 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-23 21:18:45,222 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 8 Invalid, 13 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 13 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-23 21:18:45,224 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 12 states. [2023-11-23 21:18:45,227 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 12 to 12. [2023-11-23 21:18:45,227 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 12 states, 11 states have (on average 1.3636363636363635) internal successors, (15), 11 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:18:45,228 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 12 states to 12 states and 15 transitions. [2023-11-23 21:18:45,228 INFO L78 Accepts]: Start accepts. Automaton has 12 states and 15 transitions. Word has length 10 [2023-11-23 21:18:45,229 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:18:45,229 INFO L495 AbstractCegarLoop]: Abstraction has 12 states and 15 transitions. [2023-11-23 21:18:45,229 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 3.3333333333333335) internal successors, (10), 3 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:18:45,230 INFO L276 IsEmpty]: Start isEmpty. Operand 12 states and 15 transitions. [2023-11-23 21:18:45,230 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2023-11-23 21:18:45,230 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:18:45,231 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:18:45,231 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2023-11-23 21:18:45,231 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:18:45,232 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:18:45,232 INFO L85 PathProgramCache]: Analyzing trace with hash -1400644648, now seen corresponding path program 1 times [2023-11-23 21:18:45,233 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:18:45,233 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1171714176] [2023-11-23 21:18:45,233 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:18:45,234 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:18:45,248 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:18:45,307 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 3 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 21:18:45,308 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:18:45,308 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1171714176] [2023-11-23 21:18:45,309 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1171714176] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:18:45,309 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1120230612] [2023-11-23 21:18:45,309 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:18:45,310 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:18:45,310 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6fb3703a-c2e1-4187-8aff-2d8a6efdcb24/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:18:45,313 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6fb3703a-c2e1-4187-8aff-2d8a6efdcb24/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:18:45,340 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6fb3703a-c2e1-4187-8aff-2d8a6efdcb24/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-11-23 21:18:45,411 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:18:45,413 INFO L262 TraceCheckSpWp]: Trace formula consists of 53 conjuncts, 3 conjunts are in the unsatisfiable core [2023-11-23 21:18:45,419 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 21:18:45,483 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 3 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 21:18:45,484 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-23 21:18:45,512 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 3 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 21:18:45,512 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1120230612] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-23 21:18:45,513 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1926263477] [2023-11-23 21:18:45,546 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2023-11-23 21:18:45,546 INFO L166 IcfgInterpreter]: Building call graph [2023-11-23 21:18:45,551 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-23 21:18:45,558 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-23 21:18:45,559 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-23 21:18:46,680 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-23 21:18:46,975 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '286#(and (<= 1 |#StackHeapBarrier|) (<= 6 |ULTIMATE.start_main_~b~0#1|) (<= 6 |ULTIMATE.start_main_~a~0#1|) (<= 6 |ULTIMATE.start_main_~d~0#1|) (or (not (= 6 |ULTIMATE.start_main_~a~0#1|)) (not (= 6 |ULTIMATE.start_main_~d~0#1|)) (not (= 6 |ULTIMATE.start_main_~c~0#1|)) (not (= 6 |ULTIMATE.start_main_~b~0#1|))) (<= 6 |ULTIMATE.start_main_~c~0#1|))' at error location [2023-11-23 21:18:46,976 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-23 21:18:46,983 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-23 21:18:46,984 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 7 [2023-11-23 21:18:46,985 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1273237252] [2023-11-23 21:18:46,985 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-23 21:18:46,986 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-11-23 21:18:46,987 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:18:46,989 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-11-23 21:18:46,991 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=43, Invalid=113, Unknown=0, NotChecked=0, Total=156 [2023-11-23 21:18:46,991 INFO L87 Difference]: Start difference. First operand 12 states and 15 transitions. Second operand has 7 states, 7 states have (on average 2.2857142857142856) internal successors, (16), 7 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:18:47,041 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:18:47,041 INFO L93 Difference]: Finished difference Result 25 states and 34 transitions. [2023-11-23 21:18:47,041 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-11-23 21:18:47,042 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 2.2857142857142856) internal successors, (16), 7 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 11 [2023-11-23 21:18:47,042 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:18:47,044 INFO L225 Difference]: With dead ends: 25 [2023-11-23 21:18:47,044 INFO L226 Difference]: Without dead ends: 15 [2023-11-23 21:18:47,046 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 35 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 47 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=43, Invalid=113, Unknown=0, NotChecked=0, Total=156 [2023-11-23 21:18:47,049 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 0 mSDsluCounter, 9 mSDsCounter, 0 mSdLazyCounter, 28 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 14 SdHoareTripleChecker+Invalid, 29 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 28 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-23 21:18:47,050 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 14 Invalid, 29 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 28 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-23 21:18:47,056 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 15 states. [2023-11-23 21:18:47,059 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 15 to 15. [2023-11-23 21:18:47,059 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 15 states, 14 states have (on average 1.2857142857142858) internal successors, (18), 14 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:18:47,060 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 18 transitions. [2023-11-23 21:18:47,060 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 18 transitions. Word has length 11 [2023-11-23 21:18:47,060 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:18:47,061 INFO L495 AbstractCegarLoop]: Abstraction has 15 states and 18 transitions. [2023-11-23 21:18:47,061 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 2.2857142857142856) internal successors, (16), 7 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:18:47,061 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 18 transitions. [2023-11-23 21:18:47,062 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2023-11-23 21:18:47,062 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:18:47,062 INFO L195 NwaCegarLoop]: trace histogram [4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:18:47,091 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6fb3703a-c2e1-4187-8aff-2d8a6efdcb24/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-11-23 21:18:47,284 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6fb3703a-c2e1-4187-8aff-2d8a6efdcb24/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:18:47,285 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:18:47,286 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:18:47,286 INFO L85 PathProgramCache]: Analyzing trace with hash -314173639, now seen corresponding path program 2 times [2023-11-23 21:18:47,286 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:18:47,286 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [138220843] [2023-11-23 21:18:47,286 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:18:47,287 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:18:47,299 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:18:47,367 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2023-11-23 21:18:47,368 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:18:47,374 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [138220843] [2023-11-23 21:18:47,375 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [138220843] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:18:47,377 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1968456871] [2023-11-23 21:18:47,377 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-23 21:18:47,377 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:18:47,378 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6fb3703a-c2e1-4187-8aff-2d8a6efdcb24/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:18:47,379 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6fb3703a-c2e1-4187-8aff-2d8a6efdcb24/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:18:47,408 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6fb3703a-c2e1-4187-8aff-2d8a6efdcb24/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-11-23 21:18:47,433 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2023-11-23 21:18:47,433 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-23 21:18:47,434 INFO L262 TraceCheckSpWp]: Trace formula consists of 38 conjuncts, 3 conjunts are in the unsatisfiable core [2023-11-23 21:18:47,436 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 21:18:47,469 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2023-11-23 21:18:47,469 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-23 21:18:47,510 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2023-11-23 21:18:47,510 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1968456871] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-23 21:18:47,511 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1602959106] [2023-11-23 21:18:47,514 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2023-11-23 21:18:47,514 INFO L166 IcfgInterpreter]: Building call graph [2023-11-23 21:18:47,515 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-23 21:18:47,515 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-23 21:18:47,516 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-23 21:18:48,067 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-23 21:18:48,389 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '447#(and (<= 1 |#StackHeapBarrier|) (<= 6 |ULTIMATE.start_main_~b~0#1|) (<= 6 |ULTIMATE.start_main_~a~0#1|) (<= 6 |ULTIMATE.start_main_~d~0#1|) (or (not (= 6 |ULTIMATE.start_main_~a~0#1|)) (not (= 6 |ULTIMATE.start_main_~d~0#1|)) (not (= 6 |ULTIMATE.start_main_~c~0#1|)) (not (= 6 |ULTIMATE.start_main_~b~0#1|))) (<= 6 |ULTIMATE.start_main_~c~0#1|))' at error location [2023-11-23 21:18:48,389 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-23 21:18:48,389 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-23 21:18:48,390 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 3, 3] total 8 [2023-11-23 21:18:48,390 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2013145293] [2023-11-23 21:18:48,390 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-23 21:18:48,391 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2023-11-23 21:18:48,391 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:18:48,392 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2023-11-23 21:18:48,393 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=42, Invalid=140, Unknown=0, NotChecked=0, Total=182 [2023-11-23 21:18:48,393 INFO L87 Difference]: Start difference. First operand 15 states and 18 transitions. Second operand has 8 states, 8 states have (on average 3.625) internal successors, (29), 8 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:18:48,607 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:18:48,607 INFO L93 Difference]: Finished difference Result 102 states and 132 transitions. [2023-11-23 21:18:48,608 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2023-11-23 21:18:48,608 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 3.625) internal successors, (29), 8 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 14 [2023-11-23 21:18:48,608 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:18:48,610 INFO L225 Difference]: With dead ends: 102 [2023-11-23 21:18:48,610 INFO L226 Difference]: Without dead ends: 89 [2023-11-23 21:18:48,611 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 52 GetRequests, 32 SyntacticMatches, 0 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 77 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=112, Invalid=350, Unknown=0, NotChecked=0, Total=462 [2023-11-23 21:18:48,613 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 32 mSDsluCounter, 8 mSDsCounter, 0 mSdLazyCounter, 51 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 32 SdHoareTripleChecker+Valid, 11 SdHoareTripleChecker+Invalid, 53 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 51 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-23 21:18:48,613 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [32 Valid, 11 Invalid, 53 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 51 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-23 21:18:48,615 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 89 states. [2023-11-23 21:18:48,629 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 89 to 69. [2023-11-23 21:18:48,630 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 69 states, 68 states have (on average 1.25) internal successors, (85), 68 states have internal predecessors, (85), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:18:48,632 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 85 transitions. [2023-11-23 21:18:48,633 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 85 transitions. Word has length 14 [2023-11-23 21:18:48,633 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:18:48,633 INFO L495 AbstractCegarLoop]: Abstraction has 69 states and 85 transitions. [2023-11-23 21:18:48,634 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 3.625) internal successors, (29), 8 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:18:48,634 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 85 transitions. [2023-11-23 21:18:48,637 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 69 [2023-11-23 21:18:48,637 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:18:48,638 INFO L195 NwaCegarLoop]: trace histogram [32, 8, 8, 4, 4, 4, 4, 1, 1, 1, 1] [2023-11-23 21:18:48,668 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6fb3703a-c2e1-4187-8aff-2d8a6efdcb24/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2023-11-23 21:18:48,863 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6fb3703a-c2e1-4187-8aff-2d8a6efdcb24/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2023-11-23 21:18:48,863 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:18:48,863 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:18:48,864 INFO L85 PathProgramCache]: Analyzing trace with hash 1978567869, now seen corresponding path program 3 times [2023-11-23 21:18:48,864 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:18:48,864 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1283056333] [2023-11-23 21:18:48,864 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:18:48,864 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:18:48,892 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:18:49,120 INFO L134 CoverageAnalysis]: Checked inductivity of 884 backedges. 343 proven. 1 refuted. 0 times theorem prover too weak. 540 trivial. 0 not checked. [2023-11-23 21:18:49,120 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:18:49,120 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1283056333] [2023-11-23 21:18:49,120 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1283056333] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:18:49,121 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1526569296] [2023-11-23 21:18:49,121 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-11-23 21:18:49,121 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:18:49,121 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6fb3703a-c2e1-4187-8aff-2d8a6efdcb24/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:18:49,122 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6fb3703a-c2e1-4187-8aff-2d8a6efdcb24/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:18:49,150 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6fb3703a-c2e1-4187-8aff-2d8a6efdcb24/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-11-23 21:18:49,222 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-11-23 21:18:49,222 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-23 21:18:49,224 INFO L262 TraceCheckSpWp]: Trace formula consists of 197 conjuncts, 6 conjunts are in the unsatisfiable core [2023-11-23 21:18:49,228 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 21:18:49,280 INFO L134 CoverageAnalysis]: Checked inductivity of 884 backedges. 197 proven. 10 refuted. 0 times theorem prover too weak. 677 trivial. 0 not checked. [2023-11-23 21:18:49,280 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-23 21:18:49,340 INFO L134 CoverageAnalysis]: Checked inductivity of 884 backedges. 197 proven. 10 refuted. 0 times theorem prover too weak. 677 trivial. 0 not checked. [2023-11-23 21:18:49,340 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1526569296] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-23 21:18:49,340 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1342995143] [2023-11-23 21:18:49,343 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2023-11-23 21:18:49,344 INFO L166 IcfgInterpreter]: Building call graph [2023-11-23 21:18:49,344 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-23 21:18:49,344 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-23 21:18:49,345 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-23 21:18:49,876 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-23 21:18:50,222 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1212#(and (<= 1 |#StackHeapBarrier|) (<= 6 |ULTIMATE.start_main_~b~0#1|) (<= 6 |ULTIMATE.start_main_~a~0#1|) (<= 6 |ULTIMATE.start_main_~d~0#1|) (or (not (= 6 |ULTIMATE.start_main_~a~0#1|)) (not (= 6 |ULTIMATE.start_main_~d~0#1|)) (not (= 6 |ULTIMATE.start_main_~c~0#1|)) (not (= 6 |ULTIMATE.start_main_~b~0#1|))) (<= 6 |ULTIMATE.start_main_~c~0#1|))' at error location [2023-11-23 21:18:50,222 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-23 21:18:50,222 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-23 21:18:50,222 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 7, 7] total 10 [2023-11-23 21:18:50,223 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [666421363] [2023-11-23 21:18:50,223 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-23 21:18:50,224 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2023-11-23 21:18:50,224 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:18:50,225 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2023-11-23 21:18:50,225 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=185, Unknown=0, NotChecked=0, Total=240 [2023-11-23 21:18:50,225 INFO L87 Difference]: Start difference. First operand 69 states and 85 transitions. Second operand has 10 states, 10 states have (on average 2.9) internal successors, (29), 10 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:18:50,493 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:18:50,493 INFO L93 Difference]: Finished difference Result 291 states and 399 transitions. [2023-11-23 21:18:50,494 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 22 states. [2023-11-23 21:18:50,494 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 2.9) internal successors, (29), 10 states have internal predecessors, (29), 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 68 [2023-11-23 21:18:50,494 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:18:50,497 INFO L225 Difference]: With dead ends: 291 [2023-11-23 21:18:50,497 INFO L226 Difference]: Without dead ends: 225 [2023-11-23 21:18:50,498 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 218 GetRequests, 188 SyntacticMatches, 4 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 141 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=190, Invalid=566, Unknown=0, NotChecked=0, Total=756 [2023-11-23 21:18:50,499 INFO L413 NwaCegarLoop]: 4 mSDtfsCounter, 10 mSDsluCounter, 8 mSDsCounter, 0 mSdLazyCounter, 43 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 12 SdHoareTripleChecker+Invalid, 43 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 43 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-23 21:18:50,500 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [10 Valid, 12 Invalid, 43 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 43 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-23 21:18:50,501 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 225 states. [2023-11-23 21:18:50,555 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 225 to 157. [2023-11-23 21:18:50,556 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 157 states, 156 states have (on average 1.185897435897436) internal successors, (185), 156 states have internal predecessors, (185), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:18:50,558 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 157 states to 157 states and 185 transitions. [2023-11-23 21:18:50,558 INFO L78 Accepts]: Start accepts. Automaton has 157 states and 185 transitions. Word has length 68 [2023-11-23 21:18:50,559 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:18:50,559 INFO L495 AbstractCegarLoop]: Abstraction has 157 states and 185 transitions. [2023-11-23 21:18:50,559 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 2.9) internal successors, (29), 10 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:18:50,559 INFO L276 IsEmpty]: Start isEmpty. Operand 157 states and 185 transitions. [2023-11-23 21:18:50,562 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 157 [2023-11-23 21:18:50,562 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:18:50,563 INFO L195 NwaCegarLoop]: trace histogram [96, 16, 16, 8, 8, 4, 4, 1, 1, 1, 1] [2023-11-23 21:18:50,593 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6fb3703a-c2e1-4187-8aff-2d8a6efdcb24/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2023-11-23 21:18:50,772 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6fb3703a-c2e1-4187-8aff-2d8a6efdcb24/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:18:50,773 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:18:50,773 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:18:50,774 INFO L85 PathProgramCache]: Analyzing trace with hash -1081813563, now seen corresponding path program 4 times [2023-11-23 21:18:50,774 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:18:50,774 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [752734574] [2023-11-23 21:18:50,774 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:18:50,774 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:18:50,849 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:18:51,130 INFO L134 CoverageAnalysis]: Checked inductivity of 6568 backedges. 1450 proven. 52 refuted. 0 times theorem prover too weak. 5066 trivial. 0 not checked. [2023-11-23 21:18:51,130 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:18:51,130 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [752734574] [2023-11-23 21:18:51,131 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [752734574] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:18:51,131 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1846018197] [2023-11-23 21:18:51,131 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-11-23 21:18:51,131 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:18:51,131 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6fb3703a-c2e1-4187-8aff-2d8a6efdcb24/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:18:51,133 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6fb3703a-c2e1-4187-8aff-2d8a6efdcb24/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:18:51,170 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6fb3703a-c2e1-4187-8aff-2d8a6efdcb24/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-11-23 21:18:51,294 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:18:51,297 INFO L262 TraceCheckSpWp]: Trace formula consists of 488 conjuncts, 4 conjunts are in the unsatisfiable core [2023-11-23 21:18:51,307 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 21:18:51,352 INFO L134 CoverageAnalysis]: Checked inductivity of 6568 backedges. 1450 proven. 52 refuted. 0 times theorem prover too weak. 5066 trivial. 0 not checked. [2023-11-23 21:18:51,352 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-23 21:18:51,424 INFO L134 CoverageAnalysis]: Checked inductivity of 6568 backedges. 1450 proven. 52 refuted. 0 times theorem prover too weak. 5066 trivial. 0 not checked. [2023-11-23 21:18:51,424 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1846018197] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-23 21:18:51,425 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1422923363] [2023-11-23 21:18:51,429 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2023-11-23 21:18:51,429 INFO L166 IcfgInterpreter]: Building call graph [2023-11-23 21:18:51,430 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-23 21:18:51,430 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-23 21:18:51,430 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-23 21:18:51,966 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-23 21:18:52,372 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3066#(and (<= 1 |#StackHeapBarrier|) (<= 6 |ULTIMATE.start_main_~b~0#1|) (<= 6 |ULTIMATE.start_main_~a~0#1|) (<= 6 |ULTIMATE.start_main_~d~0#1|) (or (not (= 6 |ULTIMATE.start_main_~a~0#1|)) (not (= 6 |ULTIMATE.start_main_~d~0#1|)) (not (= 6 |ULTIMATE.start_main_~c~0#1|)) (not (= 6 |ULTIMATE.start_main_~b~0#1|))) (<= 6 |ULTIMATE.start_main_~c~0#1|))' at error location [2023-11-23 21:18:52,373 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-23 21:18:52,373 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-23 21:18:52,373 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 9 [2023-11-23 21:18:52,374 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [254419282] [2023-11-23 21:18:52,374 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-23 21:18:52,374 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2023-11-23 21:18:52,375 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:18:52,376 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2023-11-23 21:18:52,376 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=59, Invalid=151, Unknown=0, NotChecked=0, Total=210 [2023-11-23 21:18:52,376 INFO L87 Difference]: Start difference. First operand 157 states and 185 transitions. Second operand has 9 states, 9 states have (on average 3.5555555555555554) internal successors, (32), 9 states have internal predecessors, (32), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:18:52,470 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:18:52,471 INFO L93 Difference]: Finished difference Result 550 states and 667 transitions. [2023-11-23 21:18:52,471 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2023-11-23 21:18:52,471 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 3.5555555555555554) internal successors, (32), 9 states have internal predecessors, (32), 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 156 [2023-11-23 21:18:52,472 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:18:52,475 INFO L225 Difference]: With dead ends: 550 [2023-11-23 21:18:52,475 INFO L226 Difference]: Without dead ends: 413 [2023-11-23 21:18:52,480 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 471 GetRequests, 458 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 69 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=59, Invalid=151, Unknown=0, NotChecked=0, Total=210 [2023-11-23 21:18:52,482 INFO L413 NwaCegarLoop]: 4 mSDtfsCounter, 4 mSDsluCounter, 6 mSDsCounter, 0 mSdLazyCounter, 41 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4 SdHoareTripleChecker+Valid, 10 SdHoareTripleChecker+Invalid, 43 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 41 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-23 21:18:52,482 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [4 Valid, 10 Invalid, 43 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 41 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-23 21:18:52,483 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 413 states. [2023-11-23 21:18:52,584 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 413 to 413. [2023-11-23 21:18:52,585 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 413 states, 412 states have (on average 1.1480582524271845) internal successors, (473), 412 states have internal predecessors, (473), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:18:52,590 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 413 states to 413 states and 473 transitions. [2023-11-23 21:18:52,590 INFO L78 Accepts]: Start accepts. Automaton has 413 states and 473 transitions. Word has length 156 [2023-11-23 21:18:52,592 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:18:52,592 INFO L495 AbstractCegarLoop]: Abstraction has 413 states and 473 transitions. [2023-11-23 21:18:52,592 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 3.5555555555555554) internal successors, (32), 9 states have internal predecessors, (32), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:18:52,592 INFO L276 IsEmpty]: Start isEmpty. Operand 413 states and 473 transitions. [2023-11-23 21:18:52,608 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 413 [2023-11-23 21:18:52,609 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:18:52,609 INFO L195 NwaCegarLoop]: trace histogram [288, 48, 48, 8, 8, 4, 4, 1, 1, 1, 1] [2023-11-23 21:18:52,633 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6fb3703a-c2e1-4187-8aff-2d8a6efdcb24/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2023-11-23 21:18:52,827 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6fb3703a-c2e1-4187-8aff-2d8a6efdcb24/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:18:52,827 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:18:52,828 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:18:52,828 INFO L85 PathProgramCache]: Analyzing trace with hash -1265930139, now seen corresponding path program 5 times [2023-11-23 21:18:52,828 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:18:52,828 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1973408774] [2023-11-23 21:18:52,828 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:18:52,829 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:18:53,008 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:18:53,513 INFO L134 CoverageAnalysis]: Checked inductivity of 57896 backedges. 21787 proven. 1816 refuted. 0 times theorem prover too weak. 34293 trivial. 0 not checked. [2023-11-23 21:18:53,513 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:18:53,513 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1973408774] [2023-11-23 21:18:53,515 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1973408774] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:18:53,516 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1857391855] [2023-11-23 21:18:53,516 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-23 21:18:53,516 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:18:53,516 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6fb3703a-c2e1-4187-8aff-2d8a6efdcb24/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:18:53,517 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6fb3703a-c2e1-4187-8aff-2d8a6efdcb24/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:18:53,536 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6fb3703a-c2e1-4187-8aff-2d8a6efdcb24/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-11-23 21:18:53,844 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 103 check-sat command(s) [2023-11-23 21:18:53,844 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-23 21:18:53,847 INFO L262 TraceCheckSpWp]: Trace formula consists of 644 conjuncts, 4 conjunts are in the unsatisfiable core [2023-11-23 21:18:53,859 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 21:18:54,019 INFO L134 CoverageAnalysis]: Checked inductivity of 57896 backedges. 21787 proven. 1816 refuted. 0 times theorem prover too weak. 34293 trivial. 0 not checked. [2023-11-23 21:18:54,019 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-23 21:18:54,201 INFO L134 CoverageAnalysis]: Checked inductivity of 57896 backedges. 21787 proven. 1816 refuted. 0 times theorem prover too weak. 34293 trivial. 0 not checked. [2023-11-23 21:18:54,201 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1857391855] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-23 21:18:54,201 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [542370016] [2023-11-23 21:18:54,204 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2023-11-23 21:18:54,204 INFO L166 IcfgInterpreter]: Building call graph [2023-11-23 21:18:54,204 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-23 21:18:54,205 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-23 21:18:54,205 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-23 21:18:54,567 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-23 21:18:54,810 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '7462#(and (<= 1 |#StackHeapBarrier|) (<= 6 |ULTIMATE.start_main_~b~0#1|) (<= 6 |ULTIMATE.start_main_~a~0#1|) (<= 6 |ULTIMATE.start_main_~d~0#1|) (or (not (= 6 |ULTIMATE.start_main_~a~0#1|)) (not (= 6 |ULTIMATE.start_main_~d~0#1|)) (not (= 6 |ULTIMATE.start_main_~c~0#1|)) (not (= 6 |ULTIMATE.start_main_~b~0#1|))) (<= 6 |ULTIMATE.start_main_~c~0#1|))' at error location [2023-11-23 21:18:54,811 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-23 21:18:54,811 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-23 21:18:54,811 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 9 [2023-11-23 21:18:54,811 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [694747580] [2023-11-23 21:18:54,812 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-23 21:18:54,813 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2023-11-23 21:18:54,813 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:18:54,814 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2023-11-23 21:18:54,814 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=152, Unknown=0, NotChecked=0, Total=210 [2023-11-23 21:18:54,815 INFO L87 Difference]: Start difference. First operand 413 states and 473 transitions. Second operand has 9 states, 9 states have (on average 5.333333333333333) internal successors, (48), 9 states have internal predecessors, (48), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:18:55,111 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:18:55,112 INFO L93 Difference]: Finished difference Result 1523 states and 1756 transitions. [2023-11-23 21:18:55,112 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2023-11-23 21:18:55,112 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 9 states have (on average 5.333333333333333) internal successors, (48), 9 states have internal predecessors, (48), 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 412 [2023-11-23 21:18:55,113 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:18:55,122 INFO L225 Difference]: With dead ends: 1523 [2023-11-23 21:18:55,122 INFO L226 Difference]: Without dead ends: 1213 [2023-11-23 21:18:55,125 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1239 GetRequests, 1226 SyntacticMatches, 0 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 69 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=58, Invalid=152, Unknown=0, NotChecked=0, Total=210 [2023-11-23 21:18:55,127 INFO L413 NwaCegarLoop]: 4 mSDtfsCounter, 8 mSDsluCounter, 11 mSDsCounter, 0 mSdLazyCounter, 52 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 8 SdHoareTripleChecker+Valid, 15 SdHoareTripleChecker+Invalid, 54 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 52 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-23 21:18:55,127 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [8 Valid, 15 Invalid, 54 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 52 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-23 21:18:55,131 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 1213 states. [2023-11-23 21:18:55,317 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 1213 to 1213. [2023-11-23 21:18:55,319 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 1213 states, 1212 states have (on average 1.1427392739273927) internal successors, (1385), 1212 states have internal predecessors, (1385), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:18:55,323 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 1213 states to 1213 states and 1385 transitions. [2023-11-23 21:18:55,324 INFO L78 Accepts]: Start accepts. Automaton has 1213 states and 1385 transitions. Word has length 412 [2023-11-23 21:18:55,324 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:18:55,324 INFO L495 AbstractCegarLoop]: Abstraction has 1213 states and 1385 transitions. [2023-11-23 21:18:55,325 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 9 states have (on average 5.333333333333333) internal successors, (48), 9 states have internal predecessors, (48), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:18:55,325 INFO L276 IsEmpty]: Start isEmpty. Operand 1213 states and 1385 transitions. [2023-11-23 21:18:55,374 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 1213 [2023-11-23 21:18:55,375 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:18:55,375 INFO L195 NwaCegarLoop]: trace histogram [864, 144, 144, 24, 24, 4, 4, 1, 1, 1, 1] [2023-11-23 21:18:55,410 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6fb3703a-c2e1-4187-8aff-2d8a6efdcb24/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2023-11-23 21:18:55,600 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6fb3703a-c2e1-4187-8aff-2d8a6efdcb24/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:18:55,601 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:18:55,601 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:18:55,601 INFO L85 PathProgramCache]: Analyzing trace with hash -1491857979, now seen corresponding path program 6 times [2023-11-23 21:18:55,602 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:18:55,602 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1575601795] [2023-11-23 21:18:55,602 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:18:55,602 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:18:57,805 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:19:00,371 INFO L134 CoverageAnalysis]: Checked inductivity of 521944 backedges. 0 proven. 391912 refuted. 0 times theorem prover too weak. 130032 trivial. 0 not checked. [2023-11-23 21:19:00,372 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:19:00,372 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1575601795] [2023-11-23 21:19:00,373 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1575601795] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:19:00,373 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [710891062] [2023-11-23 21:19:00,373 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-11-23 21:19:00,373 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:19:00,374 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6fb3703a-c2e1-4187-8aff-2d8a6efdcb24/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:19:00,377 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6fb3703a-c2e1-4187-8aff-2d8a6efdcb24/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:19:00,400 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_6fb3703a-c2e1-4187-8aff-2d8a6efdcb24/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2023-11-23 21:19:01,184 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-11-23 21:19:01,184 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-23 21:19:01,204 INFO L262 TraceCheckSpWp]: Trace formula consists of 3629 conjuncts, 28 conjunts are in the unsatisfiable core [2023-11-23 21:19:01,229 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 21:19:03,138 INFO L134 CoverageAnalysis]: Checked inductivity of 521944 backedges. 195955 proven. 27993 refuted. 0 times theorem prover too weak. 297996 trivial. 0 not checked. [2023-11-23 21:19:03,139 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-23 21:19:08,683 INFO L134 CoverageAnalysis]: Checked inductivity of 521944 backedges. 195955 proven. 27993 refuted. 0 times theorem prover too weak. 297996 trivial. 0 not checked. [2023-11-23 21:19:08,683 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [710891062] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-23 21:19:08,683 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [968964063] [2023-11-23 21:19:08,686 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2023-11-23 21:19:08,686 INFO L166 IcfgInterpreter]: Building call graph [2023-11-23 21:19:08,687 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-23 21:19:08,687 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-23 21:19:08,687 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-23 21:19:09,113 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-23 21:19:09,479 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '20247#(and (<= 1 |#StackHeapBarrier|) (<= 6 |ULTIMATE.start_main_~b~0#1|) (<= 6 |ULTIMATE.start_main_~a~0#1|) (<= 6 |ULTIMATE.start_main_~d~0#1|) (or (not (= 6 |ULTIMATE.start_main_~a~0#1|)) (not (= 6 |ULTIMATE.start_main_~d~0#1|)) (not (= 6 |ULTIMATE.start_main_~c~0#1|)) (not (= 6 |ULTIMATE.start_main_~b~0#1|))) (<= 6 |ULTIMATE.start_main_~c~0#1|))' at error location [2023-11-23 21:19:09,479 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-23 21:19:09,479 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-23 21:19:09,481 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 25, 25] total 52 [2023-11-23 21:19:09,481 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1610944375] [2023-11-23 21:19:09,481 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-23 21:19:09,484 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 52 states [2023-11-23 21:19:09,484 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:19:09,486 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 52 interpolants. [2023-11-23 21:19:09,488 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=739, Invalid=2567, Unknown=0, NotChecked=0, Total=3306 [2023-11-23 21:19:09,488 INFO L87 Difference]: Start difference. First operand 1213 states and 1385 transitions. Second operand has 52 states, 52 states have (on average 2.826923076923077) internal successors, (147), 52 states have internal predecessors, (147), 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)