./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/array-examples/sorting_selectionsort_ground-2.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version cf1a7837 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_fd2431dd-1b0b-4240-ad06-476f4e9d137c/bin/utaipan-verify-NcY6lQBIFX/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd2431dd-1b0b-4240-ad06-476f4e9d137c/bin/utaipan-verify-NcY6lQBIFX/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd2431dd-1b0b-4240-ad06-476f4e9d137c/bin/utaipan-verify-NcY6lQBIFX/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd2431dd-1b0b-4240-ad06-476f4e9d137c/bin/utaipan-verify-NcY6lQBIFX/config/TaipanReach.xml -i ../../sv-benchmarks/c/array-examples/sorting_selectionsort_ground-2.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd2431dd-1b0b-4240-ad06-476f4e9d137c/bin/utaipan-verify-NcY6lQBIFX/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd2431dd-1b0b-4240-ad06-476f4e9d137c/bin/utaipan-verify-NcY6lQBIFX --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 49403db555b72e8190819e443264a1fc2796f8e39e39a8e1b1a8f1697d9e5642 --- Real Ultimate output --- This is Ultimate 0.2.3-dev-cf1a783 [2023-11-12 00:11:32,805 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-11-12 00:11:32,925 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd2431dd-1b0b-4240-ad06-476f4e9d137c/bin/utaipan-verify-NcY6lQBIFX/config/svcomp-Reach-32bit-Taipan_Default.epf [2023-11-12 00:11:32,932 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-11-12 00:11:32,933 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-11-12 00:11:32,971 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-11-12 00:11:32,972 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-11-12 00:11:32,972 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-11-12 00:11:32,973 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-11-12 00:11:32,978 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-11-12 00:11:32,978 INFO L153 SettingsManager]: * User list type=DISABLED [2023-11-12 00:11:32,979 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-11-12 00:11:32,979 INFO L153 SettingsManager]: * Explicit value domain=true [2023-11-12 00:11:32,982 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-11-12 00:11:32,983 INFO L153 SettingsManager]: * Octagon Domain=false [2023-11-12 00:11:32,983 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-11-12 00:11:32,984 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-11-12 00:11:32,984 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-11-12 00:11:32,985 INFO L153 SettingsManager]: * Interval Domain=false [2023-11-12 00:11:32,985 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-11-12 00:11:32,985 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-11-12 00:11:32,986 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2023-11-12 00:11:32,987 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-11-12 00:11:32,988 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-11-12 00:11:32,988 INFO L153 SettingsManager]: * sizeof long=4 [2023-11-12 00:11:32,988 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-11-12 00:11:32,989 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-11-12 00:11:32,989 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-11-12 00:11:32,990 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-11-12 00:11:32,990 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-11-12 00:11:32,991 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-11-12 00:11:32,992 INFO L153 SettingsManager]: * sizeof long double=12 [2023-11-12 00:11:32,992 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2023-11-12 00:11:32,992 INFO L153 SettingsManager]: * Use constant arrays=true [2023-11-12 00:11:32,992 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-11-12 00:11:32,993 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-11-12 00:11:32,993 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-12 00:11:32,993 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-11-12 00:11:32,993 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-11-12 00:11:32,994 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2023-11-12 00:11:32,994 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-11-12 00:11:32,994 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-11-12 00:11:32,995 INFO L153 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-11-12 00:11:32,995 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-11-12 00:11:32,996 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-11-12 00:11:32,996 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_fd2431dd-1b0b-4240-ad06-476f4e9d137c/bin/utaipan-verify-NcY6lQBIFX/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd2431dd-1b0b-4240-ad06-476f4e9d137c/bin/utaipan-verify-NcY6lQBIFX Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 49403db555b72e8190819e443264a1fc2796f8e39e39a8e1b1a8f1697d9e5642 [2023-11-12 00:11:33,308 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-11-12 00:11:33,340 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-11-12 00:11:33,343 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-11-12 00:11:33,344 INFO L270 PluginConnector]: Initializing CDTParser... [2023-11-12 00:11:33,345 INFO L274 PluginConnector]: CDTParser initialized [2023-11-12 00:11:33,348 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd2431dd-1b0b-4240-ad06-476f4e9d137c/bin/utaipan-verify-NcY6lQBIFX/../../sv-benchmarks/c/array-examples/sorting_selectionsort_ground-2.i [2023-11-12 00:11:36,371 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-11-12 00:11:36,552 INFO L384 CDTParser]: Found 1 translation units. [2023-11-12 00:11:36,553 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd2431dd-1b0b-4240-ad06-476f4e9d137c/sv-benchmarks/c/array-examples/sorting_selectionsort_ground-2.i [2023-11-12 00:11:36,561 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd2431dd-1b0b-4240-ad06-476f4e9d137c/bin/utaipan-verify-NcY6lQBIFX/data/9ec64448d/6ebe68855fd54ce58610f286c706498f/FLAGd2e3c06d3 [2023-11-12 00:11:36,577 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd2431dd-1b0b-4240-ad06-476f4e9d137c/bin/utaipan-verify-NcY6lQBIFX/data/9ec64448d/6ebe68855fd54ce58610f286c706498f [2023-11-12 00:11:36,583 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-11-12 00:11:36,585 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-11-12 00:11:36,589 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-11-12 00:11:36,590 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-11-12 00:11:36,594 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-11-12 00:11:36,595 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 12.11 12:11:36" (1/1) ... [2023-11-12 00:11:36,596 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@7dc5c7d7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:11:36, skipping insertion in model container [2023-11-12 00:11:36,597 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 12.11 12:11:36" (1/1) ... [2023-11-12 00:11:36,620 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-11-12 00:11:36,828 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_fd2431dd-1b0b-4240-ad06-476f4e9d137c/sv-benchmarks/c/array-examples/sorting_selectionsort_ground-2.i[823,836] [2023-11-12 00:11:36,849 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-12 00:11:36,858 INFO L202 MainTranslator]: Completed pre-run [2023-11-12 00:11:36,870 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_fd2431dd-1b0b-4240-ad06-476f4e9d137c/sv-benchmarks/c/array-examples/sorting_selectionsort_ground-2.i[823,836] [2023-11-12 00:11:36,881 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-12 00:11:36,899 INFO L206 MainTranslator]: Completed translation [2023-11-12 00:11:36,900 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:11:36 WrapperNode [2023-11-12 00:11:36,900 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-11-12 00:11:36,901 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-11-12 00:11:36,901 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-11-12 00:11:36,901 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-11-12 00:11:36,909 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:11:36" (1/1) ... [2023-11-12 00:11:36,930 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:11:36" (1/1) ... [2023-11-12 00:11:36,965 INFO L138 Inliner]: procedures = 16, calls = 25, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 117 [2023-11-12 00:11:36,965 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-11-12 00:11:36,966 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-11-12 00:11:36,966 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-11-12 00:11:36,966 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-11-12 00:11:36,976 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:11:36" (1/1) ... [2023-11-12 00:11:36,976 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:11:36" (1/1) ... [2023-11-12 00:11:36,983 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:11:36" (1/1) ... [2023-11-12 00:11:36,984 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:11:36" (1/1) ... [2023-11-12 00:11:37,000 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:11:36" (1/1) ... [2023-11-12 00:11:37,005 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:11:36" (1/1) ... [2023-11-12 00:11:37,007 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:11:36" (1/1) ... [2023-11-12 00:11:37,008 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:11:36" (1/1) ... [2023-11-12 00:11:37,010 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-11-12 00:11:37,011 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-11-12 00:11:37,011 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-11-12 00:11:37,011 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-11-12 00:11:37,018 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:11:36" (1/1) ... [2023-11-12 00:11:37,024 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-12 00:11:37,036 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd2431dd-1b0b-4240-ad06-476f4e9d137c/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 00:11:37,049 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd2431dd-1b0b-4240-ad06-476f4e9d137c/bin/utaipan-verify-NcY6lQBIFX/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-11-12 00:11:37,074 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd2431dd-1b0b-4240-ad06-476f4e9d137c/bin/utaipan-verify-NcY6lQBIFX/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-11-12 00:11:37,090 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-11-12 00:11:37,090 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-11-12 00:11:37,090 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2023-11-12 00:11:37,090 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-11-12 00:11:37,091 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-11-12 00:11:37,091 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-11-12 00:11:37,092 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-11-12 00:11:37,093 INFO L130 BoogieDeclarations]: Found specification of procedure __VERIFIER_assert [2023-11-12 00:11:37,093 INFO L138 BoogieDeclarations]: Found implementation of procedure __VERIFIER_assert [2023-11-12 00:11:37,093 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-11-12 00:11:37,183 INFO L236 CfgBuilder]: Building ICFG [2023-11-12 00:11:37,185 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2023-11-12 00:11:37,445 INFO L277 CfgBuilder]: Performing block encoding [2023-11-12 00:11:37,517 INFO L297 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-11-12 00:11:37,517 INFO L302 CfgBuilder]: Removed 8 assume(true) statements. [2023-11-12 00:11:37,520 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 12.11 12:11:37 BoogieIcfgContainer [2023-11-12 00:11:37,520 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-11-12 00:11:37,523 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-11-12 00:11:37,524 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-11-12 00:11:37,527 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-11-12 00:11:37,527 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 12.11 12:11:36" (1/3) ... [2023-11-12 00:11:37,528 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5c721447 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 12.11 12:11:37, skipping insertion in model container [2023-11-12 00:11:37,529 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 12.11 12:11:36" (2/3) ... [2023-11-12 00:11:37,529 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5c721447 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 12.11 12:11:37, skipping insertion in model container [2023-11-12 00:11:37,529 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 12.11 12:11:37" (3/3) ... [2023-11-12 00:11:37,530 INFO L112 eAbstractionObserver]: Analyzing ICFG sorting_selectionsort_ground-2.i [2023-11-12 00:11:37,551 INFO L204 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-11-12 00:11:37,551 INFO L163 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-11-12 00:11:37,597 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-11-12 00:11:37,604 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;@67ab55c5, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-11-12 00:11:37,605 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-11-12 00:11:37,608 INFO L276 IsEmpty]: Start isEmpty. Operand has 22 states, 16 states have (on average 1.625) internal successors, (26), 17 states have internal predecessors, (26), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-11-12 00:11:37,613 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2023-11-12 00:11:37,614 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:11:37,614 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-12 00:11:37,615 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-12 00:11:37,619 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:11:37,620 INFO L85 PathProgramCache]: Analyzing trace with hash -295987307, now seen corresponding path program 1 times [2023-11-12 00:11:37,627 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:11:37,628 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [884523413] [2023-11-12 00:11:37,628 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:11:37,628 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:11:37,731 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:11:37,828 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-12 00:11:37,828 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:11:37,829 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [884523413] [2023-11-12 00:11:37,829 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [884523413] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-12 00:11:37,830 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-12 00:11:37,830 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-11-12 00:11:37,832 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [863285759] [2023-11-12 00:11:37,833 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-12 00:11:37,837 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-12 00:11:37,837 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:11:37,867 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-12 00:11:37,868 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-12 00:11:37,870 INFO L87 Difference]: Start difference. First operand has 22 states, 16 states have (on average 1.625) internal successors, (26), 17 states have internal predecessors, (26), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Second operand has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 2 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:11:37,931 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:11:37,932 INFO L93 Difference]: Finished difference Result 43 states and 66 transitions. [2023-11-12 00:11:37,938 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-12 00:11:37,940 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 2 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 9 [2023-11-12 00:11:37,940 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:11:37,947 INFO L225 Difference]: With dead ends: 43 [2023-11-12 00:11:37,947 INFO L226 Difference]: Without dead ends: 22 [2023-11-12 00:11:37,950 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-12 00:11:37,957 INFO L413 NwaCegarLoop]: 17 mSDtfsCounter, 0 mSDsluCounter, 17 mSDsCounter, 0 mSdLazyCounter, 27 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 34 SdHoareTripleChecker+Invalid, 27 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 27 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-12 00:11:37,958 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 34 Invalid, 27 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 27 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-12 00:11:37,977 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2023-11-12 00:11:37,999 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2023-11-12 00:11:38,001 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22 states, 17 states have (on average 1.4705882352941178) internal successors, (25), 17 states have internal predecessors, (25), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-11-12 00:11:38,004 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 31 transitions. [2023-11-12 00:11:38,006 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 31 transitions. Word has length 9 [2023-11-12 00:11:38,006 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:11:38,007 INFO L495 AbstractCegarLoop]: Abstraction has 22 states and 31 transitions. [2023-11-12 00:11:38,008 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 2 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:11:38,008 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 31 transitions. [2023-11-12 00:11:38,009 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2023-11-12 00:11:38,009 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:11:38,010 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-12 00:11:38,010 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-11-12 00:11:38,010 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-12 00:11:38,011 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:11:38,012 INFO L85 PathProgramCache]: Analyzing trace with hash -90765891, now seen corresponding path program 1 times [2023-11-12 00:11:38,012 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:11:38,012 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1903027953] [2023-11-12 00:11:38,013 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:11:38,013 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:11:38,056 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:11:38,177 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-12 00:11:38,178 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:11:38,178 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1903027953] [2023-11-12 00:11:38,178 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1903027953] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-12 00:11:38,178 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1019178963] [2023-11-12 00:11:38,179 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:11:38,179 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:11:38,179 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd2431dd-1b0b-4240-ad06-476f4e9d137c/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 00:11:38,188 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd2431dd-1b0b-4240-ad06-476f4e9d137c/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-12 00:11:38,200 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd2431dd-1b0b-4240-ad06-476f4e9d137c/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-11-12 00:11:38,273 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:11:38,275 INFO L262 TraceCheckSpWp]: Trace formula consists of 65 conjuncts, 2 conjunts are in the unsatisfiable core [2023-11-12 00:11:38,280 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-12 00:11:38,300 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-12 00:11:38,301 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-12 00:11:38,301 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1019178963] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-12 00:11:38,302 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-12 00:11:38,302 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [3] total 5 [2023-11-12 00:11:38,303 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [956166728] [2023-11-12 00:11:38,303 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-12 00:11:38,304 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-12 00:11:38,304 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:11:38,305 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-12 00:11:38,305 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2023-11-12 00:11:38,305 INFO L87 Difference]: Start difference. First operand 22 states and 31 transitions. Second operand has 3 states, 3 states have (on average 3.0) internal successors, (9), 3 states have internal predecessors, (9), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:11:38,364 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:11:38,364 INFO L93 Difference]: Finished difference Result 41 states and 58 transitions. [2023-11-12 00:11:38,364 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-12 00:11:38,365 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 3.0) internal successors, (9), 3 states have internal predecessors, (9), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 10 [2023-11-12 00:11:38,365 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:11:38,366 INFO L225 Difference]: With dead ends: 41 [2023-11-12 00:11:38,366 INFO L226 Difference]: Without dead ends: 31 [2023-11-12 00:11:38,367 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 12 GetRequests, 9 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2023-11-12 00:11:38,369 INFO L413 NwaCegarLoop]: 13 mSDtfsCounter, 11 mSDsluCounter, 13 mSDsCounter, 0 mSdLazyCounter, 31 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 13 SdHoareTripleChecker+Valid, 26 SdHoareTripleChecker+Invalid, 32 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 31 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-12 00:11:38,370 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [13 Valid, 26 Invalid, 32 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 31 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-12 00:11:38,371 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2023-11-12 00:11:38,377 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 23. [2023-11-12 00:11:38,378 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23 states, 18 states have (on average 1.4444444444444444) internal successors, (26), 18 states have internal predecessors, (26), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-11-12 00:11:38,379 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 32 transitions. [2023-11-12 00:11:38,379 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 32 transitions. Word has length 10 [2023-11-12 00:11:38,380 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:11:38,380 INFO L495 AbstractCegarLoop]: Abstraction has 23 states and 32 transitions. [2023-11-12 00:11:38,380 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 3.0) internal successors, (9), 3 states have internal predecessors, (9), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:11:38,380 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 32 transitions. [2023-11-12 00:11:38,381 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2023-11-12 00:11:38,381 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:11:38,382 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-12 00:11:38,393 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd2431dd-1b0b-4240-ad06-476f4e9d137c/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-11-12 00:11:38,588 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd2431dd-1b0b-4240-ad06-476f4e9d137c/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1 [2023-11-12 00:11:38,588 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-12 00:11:38,589 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:11:38,589 INFO L85 PathProgramCache]: Analyzing trace with hash 1489964890, now seen corresponding path program 1 times [2023-11-12 00:11:38,589 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:11:38,590 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1396314314] [2023-11-12 00:11:38,590 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:11:38,590 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:11:38,614 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:11:38,728 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-12 00:11:38,729 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:11:38,730 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1396314314] [2023-11-12 00:11:38,731 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1396314314] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-12 00:11:38,733 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [467420212] [2023-11-12 00:11:38,736 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:11:38,737 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:11:38,737 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd2431dd-1b0b-4240-ad06-476f4e9d137c/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 00:11:38,739 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd2431dd-1b0b-4240-ad06-476f4e9d137c/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-12 00:11:38,745 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd2431dd-1b0b-4240-ad06-476f4e9d137c/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-11-12 00:11:38,833 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:11:38,835 INFO L262 TraceCheckSpWp]: Trace formula consists of 76 conjuncts, 3 conjunts are in the unsatisfiable core [2023-11-12 00:11:38,836 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-12 00:11:38,888 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-12 00:11:38,888 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-12 00:11:38,920 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-12 00:11:38,920 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [467420212] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-12 00:11:38,921 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1349808540] [2023-11-12 00:11:38,949 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2023-11-12 00:11:38,950 INFO L166 IcfgInterpreter]: Building call graph [2023-11-12 00:11:38,955 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-12 00:11:38,961 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-12 00:11:38,961 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-12 00:11:39,495 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-12 00:11:39,567 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSifa [1349808540] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-12 00:11:39,567 INFO L185 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2023-11-12 00:11:39,567 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [3, 3, 3] total 9 [2023-11-12 00:11:39,568 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [877412407] [2023-11-12 00:11:39,568 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-12 00:11:39,568 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-11-12 00:11:39,568 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:11:39,569 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-11-12 00:11:39,569 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=29, Invalid=61, Unknown=0, NotChecked=0, Total=90 [2023-11-12 00:11:39,570 INFO L87 Difference]: Start difference. First operand 23 states and 32 transitions. Second operand has 5 states, 5 states have (on average 2.0) internal successors, (10), 4 states have internal predecessors, (10), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:11:39,665 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:11:39,665 INFO L93 Difference]: Finished difference Result 51 states and 75 transitions. [2023-11-12 00:11:39,666 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-11-12 00:11:39,666 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.0) internal successors, (10), 4 states have internal predecessors, (10), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 11 [2023-11-12 00:11:39,666 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:11:39,667 INFO L225 Difference]: With dead ends: 51 [2023-11-12 00:11:39,667 INFO L226 Difference]: Without dead ends: 32 [2023-11-12 00:11:39,668 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 26 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 23 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=29, Invalid=61, Unknown=0, NotChecked=0, Total=90 [2023-11-12 00:11:39,669 INFO L413 NwaCegarLoop]: 13 mSDtfsCounter, 10 mSDsluCounter, 10 mSDsCounter, 0 mSdLazyCounter, 61 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 23 SdHoareTripleChecker+Invalid, 61 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 61 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-12 00:11:39,670 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [12 Valid, 23 Invalid, 61 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 61 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-12 00:11:39,671 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2023-11-12 00:11:39,676 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 24. [2023-11-12 00:11:39,676 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 19 states have (on average 1.4210526315789473) internal successors, (27), 19 states have internal predecessors, (27), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-11-12 00:11:39,677 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 33 transitions. [2023-11-12 00:11:39,678 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 33 transitions. Word has length 11 [2023-11-12 00:11:39,678 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:11:39,678 INFO L495 AbstractCegarLoop]: Abstraction has 24 states and 33 transitions. [2023-11-12 00:11:39,678 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 2.0) internal successors, (10), 4 states have internal predecessors, (10), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:11:39,678 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 33 transitions. [2023-11-12 00:11:39,679 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 13 [2023-11-12 00:11:39,679 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:11:39,679 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-12 00:11:39,693 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd2431dd-1b0b-4240-ad06-476f4e9d137c/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2023-11-12 00:11:39,884 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd2431dd-1b0b-4240-ad06-476f4e9d137c/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:11:39,885 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-12 00:11:39,885 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:11:39,885 INFO L85 PathProgramCache]: Analyzing trace with hash 2096015296, now seen corresponding path program 1 times [2023-11-12 00:11:39,886 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:11:39,886 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2064430107] [2023-11-12 00:11:39,886 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:11:39,886 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:11:39,899 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:11:39,950 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-12 00:11:39,950 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:11:39,950 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2064430107] [2023-11-12 00:11:39,951 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2064430107] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-12 00:11:39,951 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1618298037] [2023-11-12 00:11:39,951 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:11:39,951 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:11:39,951 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd2431dd-1b0b-4240-ad06-476f4e9d137c/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 00:11:39,953 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd2431dd-1b0b-4240-ad06-476f4e9d137c/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-12 00:11:39,972 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd2431dd-1b0b-4240-ad06-476f4e9d137c/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-11-12 00:11:40,019 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:11:40,020 INFO L262 TraceCheckSpWp]: Trace formula consists of 80 conjuncts, 3 conjunts are in the unsatisfiable core [2023-11-12 00:11:40,022 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-12 00:11:40,032 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-12 00:11:40,032 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-12 00:11:40,048 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-12 00:11:40,049 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1618298037] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-12 00:11:40,049 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [322784065] [2023-11-12 00:11:40,052 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2023-11-12 00:11:40,052 INFO L166 IcfgInterpreter]: Building call graph [2023-11-12 00:11:40,053 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-12 00:11:40,053 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-12 00:11:40,053 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-12 00:11:40,367 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 29 for LOIs [2023-11-12 00:11:40,378 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-12 00:11:40,589 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSifa [322784065] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-12 00:11:40,589 INFO L185 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2023-11-12 00:11:40,589 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [3, 3, 3] total 14 [2023-11-12 00:11:40,590 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [518809652] [2023-11-12 00:11:40,590 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-12 00:11:40,591 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2023-11-12 00:11:40,591 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:11:40,591 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2023-11-12 00:11:40,592 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=139, Unknown=5, NotChecked=0, Total=182 [2023-11-12 00:11:40,592 INFO L87 Difference]: Start difference. First operand 24 states and 33 transitions. Second operand has 9 states, 8 states have (on average 1.375) internal successors, (11), 8 states have internal predecessors, (11), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:11:40,976 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:11:40,976 INFO L93 Difference]: Finished difference Result 62 states and 90 transitions. [2023-11-12 00:11:40,977 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2023-11-12 00:11:40,977 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 8 states have (on average 1.375) internal successors, (11), 8 states have internal predecessors, (11), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 12 [2023-11-12 00:11:40,977 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:11:40,978 INFO L225 Difference]: With dead ends: 62 [2023-11-12 00:11:40,978 INFO L226 Difference]: Without dead ends: 43 [2023-11-12 00:11:40,979 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 39 GetRequests, 25 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 54 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=50, Invalid=185, Unknown=5, NotChecked=0, Total=240 [2023-11-12 00:11:40,981 INFO L413 NwaCegarLoop]: 11 mSDtfsCounter, 16 mSDsluCounter, 46 mSDsCounter, 0 mSdLazyCounter, 165 mSolverCounterSat, 8 mSolverCounterUnsat, 5 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 19 SdHoareTripleChecker+Valid, 57 SdHoareTripleChecker+Invalid, 178 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 165 IncrementalHoareTripleChecker+Invalid, 5 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-11-12 00:11:40,982 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [19 Valid, 57 Invalid, 178 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 165 Invalid, 5 Unknown, 0 Unchecked, 0.3s Time] [2023-11-12 00:11:40,983 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2023-11-12 00:11:40,991 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 33. [2023-11-12 00:11:40,991 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 33 states, 26 states have (on average 1.3846153846153846) internal successors, (36), 27 states have internal predecessors, (36), 4 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (4), 3 states have call predecessors, (4), 4 states have call successors, (4) [2023-11-12 00:11:40,998 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 33 states to 33 states and 44 transitions. [2023-11-12 00:11:40,998 INFO L78 Accepts]: Start accepts. Automaton has 33 states and 44 transitions. Word has length 12 [2023-11-12 00:11:40,998 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:11:40,999 INFO L495 AbstractCegarLoop]: Abstraction has 33 states and 44 transitions. [2023-11-12 00:11:40,999 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 8 states have (on average 1.375) internal successors, (11), 8 states have internal predecessors, (11), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-12 00:11:41,000 INFO L276 IsEmpty]: Start isEmpty. Operand 33 states and 44 transitions. [2023-11-12 00:11:41,001 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2023-11-12 00:11:41,001 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:11:41,001 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-12 00:11:41,021 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd2431dd-1b0b-4240-ad06-476f4e9d137c/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2023-11-12 00:11:41,221 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd2431dd-1b0b-4240-ad06-476f4e9d137c/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:11:41,221 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-12 00:11:41,221 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:11:41,222 INFO L85 PathProgramCache]: Analyzing trace with hash 1918234630, now seen corresponding path program 1 times [2023-11-12 00:11:41,222 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:11:41,222 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1980106997] [2023-11-12 00:11:41,222 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:11:41,222 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:11:41,260 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:11:41,315 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-11-12 00:11:41,315 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:11:41,315 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1980106997] [2023-11-12 00:11:41,316 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1980106997] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-12 00:11:41,318 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1746182629] [2023-11-12 00:11:41,318 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:11:41,318 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:11:41,318 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd2431dd-1b0b-4240-ad06-476f4e9d137c/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 00:11:41,325 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd2431dd-1b0b-4240-ad06-476f4e9d137c/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-12 00:11:41,348 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd2431dd-1b0b-4240-ad06-476f4e9d137c/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-11-12 00:11:41,401 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:11:41,402 INFO L262 TraceCheckSpWp]: Trace formula consists of 96 conjuncts, 3 conjunts are in the unsatisfiable core [2023-11-12 00:11:41,404 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-12 00:11:41,414 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2023-11-12 00:11:41,414 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-12 00:11:41,436 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-11-12 00:11:41,437 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1746182629] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-12 00:11:41,437 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1274946114] [2023-11-12 00:11:41,442 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-11-12 00:11:41,442 INFO L166 IcfgInterpreter]: Building call graph [2023-11-12 00:11:41,443 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-12 00:11:41,443 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-12 00:11:41,443 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-12 00:11:41,795 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 6 for LOIs [2023-11-12 00:11:41,801 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-12 00:11:41,974 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '809#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0))' at error location [2023-11-12 00:11:41,975 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-12 00:11:41,975 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-12 00:11:41,975 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 3, 4] total 7 [2023-11-12 00:11:41,975 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [660518616] [2023-11-12 00:11:41,975 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-12 00:11:41,976 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-11-12 00:11:41,976 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:11:41,977 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-11-12 00:11:41,978 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=46, Invalid=193, Unknown=1, NotChecked=0, Total=240 [2023-11-12 00:11:41,978 INFO L87 Difference]: Start difference. First operand 33 states and 44 transitions. Second operand has 7 states, 7 states have (on average 3.142857142857143) internal successors, (22), 7 states have internal predecessors, (22), 1 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2023-11-12 00:11:42,047 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:11:42,047 INFO L93 Difference]: Finished difference Result 66 states and 90 transitions. [2023-11-12 00:11:42,047 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-11-12 00:11:42,048 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 3.142857142857143) internal successors, (22), 7 states have internal predecessors, (22), 1 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 19 [2023-11-12 00:11:42,048 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:11:42,052 INFO L225 Difference]: With dead ends: 66 [2023-11-12 00:11:42,052 INFO L226 Difference]: Without dead ends: 36 [2023-11-12 00:11:42,053 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 45 SyntacticMatches, 0 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 70 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=46, Invalid=193, Unknown=1, NotChecked=0, Total=240 [2023-11-12 00:11:42,054 INFO L413 NwaCegarLoop]: 17 mSDtfsCounter, 0 mSDsluCounter, 51 mSDsCounter, 0 mSdLazyCounter, 50 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 68 SdHoareTripleChecker+Invalid, 51 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 50 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-12 00:11:42,055 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 68 Invalid, 51 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 50 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-12 00:11:42,056 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 36 states. [2023-11-12 00:11:42,072 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 36 to 36. [2023-11-12 00:11:42,073 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 36 states, 29 states have (on average 1.3448275862068966) internal successors, (39), 30 states have internal predecessors, (39), 4 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (4), 3 states have call predecessors, (4), 4 states have call successors, (4) [2023-11-12 00:11:42,076 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 36 states to 36 states and 47 transitions. [2023-11-12 00:11:42,076 INFO L78 Accepts]: Start accepts. Automaton has 36 states and 47 transitions. Word has length 19 [2023-11-12 00:11:42,077 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:11:42,077 INFO L495 AbstractCegarLoop]: Abstraction has 36 states and 47 transitions. [2023-11-12 00:11:42,077 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 3.142857142857143) internal successors, (22), 7 states have internal predecessors, (22), 1 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2023-11-12 00:11:42,077 INFO L276 IsEmpty]: Start isEmpty. Operand 36 states and 47 transitions. [2023-11-12 00:11:42,078 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2023-11-12 00:11:42,078 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:11:42,078 INFO L195 NwaCegarLoop]: trace histogram [4, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-12 00:11:42,089 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd2431dd-1b0b-4240-ad06-476f4e9d137c/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2023-11-12 00:11:42,284 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd2431dd-1b0b-4240-ad06-476f4e9d137c/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:11:42,285 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-12 00:11:42,285 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:11:42,285 INFO L85 PathProgramCache]: Analyzing trace with hash 1880155950, now seen corresponding path program 2 times [2023-11-12 00:11:42,285 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:11:42,285 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [479090630] [2023-11-12 00:11:42,285 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:11:42,286 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:11:42,316 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:11:42,480 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 2 proven. 10 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-11-12 00:11:42,481 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:11:42,481 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [479090630] [2023-11-12 00:11:42,481 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [479090630] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-12 00:11:42,481 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [745572118] [2023-11-12 00:11:42,482 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-12 00:11:42,482 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:11:42,482 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd2431dd-1b0b-4240-ad06-476f4e9d137c/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 00:11:42,483 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd2431dd-1b0b-4240-ad06-476f4e9d137c/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-12 00:11:42,500 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd2431dd-1b0b-4240-ad06-476f4e9d137c/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-11-12 00:11:42,558 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2023-11-12 00:11:42,558 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-12 00:11:42,559 INFO L262 TraceCheckSpWp]: Trace formula consists of 105 conjuncts, 4 conjunts are in the unsatisfiable core [2023-11-12 00:11:42,560 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-12 00:11:42,586 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2023-11-12 00:11:42,587 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-12 00:11:42,626 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2023-11-12 00:11:42,627 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [745572118] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-12 00:11:42,627 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [905051083] [2023-11-12 00:11:42,631 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-11-12 00:11:42,631 INFO L166 IcfgInterpreter]: Building call graph [2023-11-12 00:11:42,632 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-12 00:11:42,632 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-12 00:11:42,632 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-12 00:11:42,930 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 6 for LOIs [2023-11-12 00:11:42,939 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-12 00:11:43,131 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1126#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0))' at error location [2023-11-12 00:11:43,131 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-12 00:11:43,131 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-12 00:11:43,131 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 5, 5] total 13 [2023-11-12 00:11:43,131 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [954003896] [2023-11-12 00:11:43,132 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-12 00:11:43,132 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2023-11-12 00:11:43,132 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:11:43,133 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2023-11-12 00:11:43,133 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=73, Invalid=388, Unknown=1, NotChecked=0, Total=462 [2023-11-12 00:11:43,134 INFO L87 Difference]: Start difference. First operand 36 states and 47 transitions. Second operand has 13 states, 13 states have (on average 2.3076923076923075) internal successors, (30), 13 states have internal predecessors, (30), 1 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2023-11-12 00:11:43,415 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:11:43,415 INFO L93 Difference]: Finished difference Result 89 states and 128 transitions. [2023-11-12 00:11:43,415 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2023-11-12 00:11:43,415 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 13 states have (on average 2.3076923076923075) internal successors, (30), 13 states have internal predecessors, (30), 1 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 22 [2023-11-12 00:11:43,416 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:11:43,416 INFO L225 Difference]: With dead ends: 89 [2023-11-12 00:11:43,417 INFO L226 Difference]: Without dead ends: 59 [2023-11-12 00:11:43,418 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 82 GetRequests, 51 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 236 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=167, Invalid=886, Unknown=3, NotChecked=0, Total=1056 [2023-11-12 00:11:43,419 INFO L413 NwaCegarLoop]: 13 mSDtfsCounter, 44 mSDsluCounter, 65 mSDsCounter, 0 mSdLazyCounter, 116 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 47 SdHoareTripleChecker+Valid, 78 SdHoareTripleChecker+Invalid, 122 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 116 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-12 00:11:43,419 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [47 Valid, 78 Invalid, 122 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 116 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-12 00:11:43,420 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2023-11-12 00:11:43,430 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 48. [2023-11-12 00:11:43,431 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 48 states, 39 states have (on average 1.2820512820512822) internal successors, (50), 41 states have internal predecessors, (50), 6 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (6), 4 states have call predecessors, (6), 6 states have call successors, (6) [2023-11-12 00:11:43,432 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 48 states to 48 states and 62 transitions. [2023-11-12 00:11:43,432 INFO L78 Accepts]: Start accepts. Automaton has 48 states and 62 transitions. Word has length 22 [2023-11-12 00:11:43,432 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:11:43,432 INFO L495 AbstractCegarLoop]: Abstraction has 48 states and 62 transitions. [2023-11-12 00:11:43,433 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 13 states have (on average 2.3076923076923075) internal successors, (30), 13 states have internal predecessors, (30), 1 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2023-11-12 00:11:43,433 INFO L276 IsEmpty]: Start isEmpty. Operand 48 states and 62 transitions. [2023-11-12 00:11:43,433 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2023-11-12 00:11:43,434 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:11:43,434 INFO L195 NwaCegarLoop]: trace histogram [5, 4, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-12 00:11:43,445 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd2431dd-1b0b-4240-ad06-476f4e9d137c/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2023-11-12 00:11:43,640 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd2431dd-1b0b-4240-ad06-476f4e9d137c/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2023-11-12 00:11:43,640 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-12 00:11:43,641 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:11:43,641 INFO L85 PathProgramCache]: Analyzing trace with hash 1358627756, now seen corresponding path program 3 times [2023-11-12 00:11:43,641 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:11:43,641 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2131511698] [2023-11-12 00:11:43,641 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:11:43,641 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:11:43,663 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:11:43,807 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 2 proven. 15 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2023-11-12 00:11:43,807 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:11:43,808 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2131511698] [2023-11-12 00:11:43,808 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2131511698] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-12 00:11:43,808 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [105592852] [2023-11-12 00:11:43,808 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-11-12 00:11:43,808 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:11:43,809 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd2431dd-1b0b-4240-ad06-476f4e9d137c/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 00:11:43,810 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd2431dd-1b0b-4240-ad06-476f4e9d137c/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-12 00:11:43,836 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd2431dd-1b0b-4240-ad06-476f4e9d137c/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2023-11-12 00:11:43,898 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-11-12 00:11:43,898 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-12 00:11:43,899 INFO L262 TraceCheckSpWp]: Trace formula consists of 144 conjuncts, 7 conjunts are in the unsatisfiable core [2023-11-12 00:11:43,901 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-12 00:11:43,927 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2023-11-12 00:11:43,928 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-12 00:11:44,016 INFO L134 CoverageAnalysis]: Checked inductivity of 29 backedges. 2 proven. 15 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2023-11-12 00:11:44,016 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [105592852] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-12 00:11:44,017 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1317403064] [2023-11-12 00:11:44,020 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-11-12 00:11:44,020 INFO L166 IcfgInterpreter]: Building call graph [2023-11-12 00:11:44,021 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-12 00:11:44,021 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-12 00:11:44,022 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-12 00:11:44,367 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 6 for LOIs [2023-11-12 00:11:44,376 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-12 00:11:44,539 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1557#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0))' at error location [2023-11-12 00:11:44,540 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-12 00:11:44,540 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-12 00:11:44,540 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 7, 8] total 15 [2023-11-12 00:11:44,541 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [331360883] [2023-11-12 00:11:44,541 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-12 00:11:44,541 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2023-11-12 00:11:44,542 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:11:44,542 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2023-11-12 00:11:44,543 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=130, Invalid=418, Unknown=4, NotChecked=0, Total=552 [2023-11-12 00:11:44,543 INFO L87 Difference]: Start difference. First operand 48 states and 62 transitions. Second operand has 15 states, 15 states have (on average 2.0) internal successors, (30), 15 states have internal predecessors, (30), 1 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2023-11-12 00:11:44,612 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:11:44,612 INFO L93 Difference]: Finished difference Result 96 states and 130 transitions. [2023-11-12 00:11:44,613 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2023-11-12 00:11:44,613 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 2.0) internal successors, (30), 15 states have internal predecessors, (30), 1 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 26 [2023-11-12 00:11:44,613 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:11:44,614 INFO L225 Difference]: With dead ends: 96 [2023-11-12 00:11:44,614 INFO L226 Difference]: Without dead ends: 55 [2023-11-12 00:11:44,618 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 84 GetRequests, 62 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 191 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=130, Invalid=418, Unknown=4, NotChecked=0, Total=552 [2023-11-12 00:11:44,619 INFO L413 NwaCegarLoop]: 17 mSDtfsCounter, 0 mSDsluCounter, 68 mSDsCounter, 0 mSdLazyCounter, 69 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 85 SdHoareTripleChecker+Invalid, 70 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 69 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-12 00:11:44,619 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 85 Invalid, 70 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 69 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-12 00:11:44,620 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 55 states. [2023-11-12 00:11:44,643 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 55 to 55. [2023-11-12 00:11:44,643 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 55 states, 46 states have (on average 1.2391304347826086) internal successors, (57), 48 states have internal predecessors, (57), 6 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (6), 4 states have call predecessors, (6), 6 states have call successors, (6) [2023-11-12 00:11:44,644 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 55 states to 55 states and 69 transitions. [2023-11-12 00:11:44,644 INFO L78 Accepts]: Start accepts. Automaton has 55 states and 69 transitions. Word has length 26 [2023-11-12 00:11:44,644 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:11:44,645 INFO L495 AbstractCegarLoop]: Abstraction has 55 states and 69 transitions. [2023-11-12 00:11:44,646 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 15 states have (on average 2.0) internal successors, (30), 15 states have internal predecessors, (30), 1 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2023-11-12 00:11:44,646 INFO L276 IsEmpty]: Start isEmpty. Operand 55 states and 69 transitions. [2023-11-12 00:11:44,647 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2023-11-12 00:11:44,648 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:11:44,648 INFO L195 NwaCegarLoop]: trace histogram [12, 4, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-12 00:11:44,661 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd2431dd-1b0b-4240-ad06-476f4e9d137c/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2023-11-12 00:11:44,853 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd2431dd-1b0b-4240-ad06-476f4e9d137c/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2023-11-12 00:11:44,854 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-12 00:11:44,854 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:11:44,854 INFO L85 PathProgramCache]: Analyzing trace with hash -1041204860, now seen corresponding path program 4 times [2023-11-12 00:11:44,854 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:11:44,854 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [96821261] [2023-11-12 00:11:44,854 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:11:44,855 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:11:44,904 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:11:45,235 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 2 proven. 78 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2023-11-12 00:11:45,235 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:11:45,235 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [96821261] [2023-11-12 00:11:45,235 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [96821261] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-12 00:11:45,236 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1172524604] [2023-11-12 00:11:45,236 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-11-12 00:11:45,236 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:11:45,236 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd2431dd-1b0b-4240-ad06-476f4e9d137c/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 00:11:45,237 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd2431dd-1b0b-4240-ad06-476f4e9d137c/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-12 00:11:45,260 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd2431dd-1b0b-4240-ad06-476f4e9d137c/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2023-11-12 00:11:45,377 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:11:45,378 INFO L262 TraceCheckSpWp]: Trace formula consists of 207 conjuncts, 14 conjunts are in the unsatisfiable core [2023-11-12 00:11:45,382 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-12 00:11:45,411 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2023-11-12 00:11:45,411 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-12 00:11:45,732 INFO L134 CoverageAnalysis]: Checked inductivity of 92 backedges. 2 proven. 78 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2023-11-12 00:11:45,732 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1172524604] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-12 00:11:45,732 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1304353012] [2023-11-12 00:11:45,735 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-11-12 00:11:45,735 INFO L166 IcfgInterpreter]: Building call graph [2023-11-12 00:11:45,735 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-12 00:11:45,735 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-12 00:11:45,735 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-12 00:11:45,959 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 6 for LOIs [2023-11-12 00:11:45,964 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-12 00:11:46,175 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2051#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0))' at error location [2023-11-12 00:11:46,175 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-12 00:11:46,175 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-12 00:11:46,176 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 14, 15] total 29 [2023-11-12 00:11:46,176 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1281709399] [2023-11-12 00:11:46,176 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-12 00:11:46,177 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2023-11-12 00:11:46,177 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:11:46,178 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2023-11-12 00:11:46,178 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=431, Invalid=972, Unknown=3, NotChecked=0, Total=1406 [2023-11-12 00:11:46,179 INFO L87 Difference]: Start difference. First operand 55 states and 69 transitions. Second operand has 29 states, 29 states have (on average 1.5172413793103448) internal successors, (44), 29 states have internal predecessors, (44), 1 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2023-11-12 00:11:46,290 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:11:46,290 INFO L93 Difference]: Finished difference Result 110 states and 151 transitions. [2023-11-12 00:11:46,291 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 28 states. [2023-11-12 00:11:46,291 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 29 states have (on average 1.5172413793103448) internal successors, (44), 29 states have internal predecessors, (44), 1 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 33 [2023-11-12 00:11:46,291 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:11:46,292 INFO L225 Difference]: With dead ends: 110 [2023-11-12 00:11:46,292 INFO L226 Difference]: Without dead ends: 69 [2023-11-12 00:11:46,293 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 112 GetRequests, 76 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 410 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=431, Invalid=972, Unknown=3, NotChecked=0, Total=1406 [2023-11-12 00:11:46,294 INFO L413 NwaCegarLoop]: 17 mSDtfsCounter, 0 mSDsluCounter, 85 mSDsCounter, 0 mSdLazyCounter, 94 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 102 SdHoareTripleChecker+Invalid, 95 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 94 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-12 00:11:46,294 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 102 Invalid, 95 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 94 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-12 00:11:46,295 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 69 states. [2023-11-12 00:11:46,310 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 69 to 69. [2023-11-12 00:11:46,310 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 69 states, 60 states have (on average 1.1833333333333333) internal successors, (71), 62 states have internal predecessors, (71), 6 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (6), 4 states have call predecessors, (6), 6 states have call successors, (6) [2023-11-12 00:11:46,311 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 69 states to 69 states and 83 transitions. [2023-11-12 00:11:46,311 INFO L78 Accepts]: Start accepts. Automaton has 69 states and 83 transitions. Word has length 33 [2023-11-12 00:11:46,312 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:11:46,312 INFO L495 AbstractCegarLoop]: Abstraction has 69 states and 83 transitions. [2023-11-12 00:11:46,312 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 29 states have (on average 1.5172413793103448) internal successors, (44), 29 states have internal predecessors, (44), 1 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2023-11-12 00:11:46,313 INFO L276 IsEmpty]: Start isEmpty. Operand 69 states and 83 transitions. [2023-11-12 00:11:46,321 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 48 [2023-11-12 00:11:46,321 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:11:46,321 INFO L195 NwaCegarLoop]: trace histogram [26, 4, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-12 00:11:46,331 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd2431dd-1b0b-4240-ad06-476f4e9d137c/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2023-11-12 00:11:46,527 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd2431dd-1b0b-4240-ad06-476f4e9d137c/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable7 [2023-11-12 00:11:46,527 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-12 00:11:46,528 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:11:46,528 INFO L85 PathProgramCache]: Analyzing trace with hash 197237892, now seen corresponding path program 5 times [2023-11-12 00:11:46,528 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:11:46,528 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1820223103] [2023-11-12 00:11:46,528 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:11:46,529 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:11:46,595 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:11:47,531 INFO L134 CoverageAnalysis]: Checked inductivity of 365 backedges. 2 proven. 351 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2023-11-12 00:11:47,531 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:11:47,532 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1820223103] [2023-11-12 00:11:47,532 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1820223103] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-12 00:11:47,532 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [203452085] [2023-11-12 00:11:47,532 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-12 00:11:47,532 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:11:47,532 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd2431dd-1b0b-4240-ad06-476f4e9d137c/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 00:11:47,534 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd2431dd-1b0b-4240-ad06-476f4e9d137c/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-12 00:11:47,541 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd2431dd-1b0b-4240-ad06-476f4e9d137c/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2023-11-12 00:11:47,661 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2023-11-12 00:11:47,661 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-12 00:11:47,663 INFO L262 TraceCheckSpWp]: Trace formula consists of 135 conjuncts, 7 conjunts are in the unsatisfiable core [2023-11-12 00:11:47,667 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-12 00:11:47,801 INFO L134 CoverageAnalysis]: Checked inductivity of 365 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 355 trivial. 0 not checked. [2023-11-12 00:11:47,802 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-12 00:11:47,971 INFO L134 CoverageAnalysis]: Checked inductivity of 365 backedges. 2 proven. 10 refuted. 0 times theorem prover too weak. 353 trivial. 0 not checked. [2023-11-12 00:11:47,972 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [203452085] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-12 00:11:47,972 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [381144388] [2023-11-12 00:11:47,974 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-11-12 00:11:47,974 INFO L166 IcfgInterpreter]: Building call graph [2023-11-12 00:11:47,975 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-12 00:11:47,976 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-12 00:11:47,976 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-12 00:11:48,219 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 6 for LOIs [2023-11-12 00:11:48,225 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-12 00:11:48,581 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2697#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0))' at error location [2023-11-12 00:11:48,581 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-12 00:11:48,581 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-12 00:11:48,581 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 8, 8] total 41 [2023-11-12 00:11:48,581 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1744990928] [2023-11-12 00:11:48,582 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-12 00:11:48,582 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 41 states [2023-11-12 00:11:48,582 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:11:48,583 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2023-11-12 00:11:48,584 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=509, Invalid=1936, Unknown=5, NotChecked=0, Total=2450 [2023-11-12 00:11:48,585 INFO L87 Difference]: Start difference. First operand 69 states and 83 transitions. Second operand has 41 states, 41 states have (on average 1.4146341463414633) internal successors, (58), 41 states have internal predecessors, (58), 1 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2023-11-12 00:11:49,962 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:11:49,962 INFO L93 Difference]: Finished difference Result 131 states and 176 transitions. [2023-11-12 00:11:49,963 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 46 states. [2023-11-12 00:11:49,963 INFO L78 Accepts]: Start accepts. Automaton has has 41 states, 41 states have (on average 1.4146341463414633) internal successors, (58), 41 states have internal predecessors, (58), 1 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 47 [2023-11-12 00:11:49,963 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:11:49,965 INFO L225 Difference]: With dead ends: 131 [2023-11-12 00:11:49,965 INFO L226 Difference]: Without dead ends: 90 [2023-11-12 00:11:49,973 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 210 GetRequests, 120 SyntacticMatches, 0 SemanticMatches, 90 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1832 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=1566, Invalid=6795, Unknown=11, NotChecked=0, Total=8372 [2023-11-12 00:11:49,976 INFO L413 NwaCegarLoop]: 14 mSDtfsCounter, 59 mSDsluCounter, 151 mSDsCounter, 0 mSdLazyCounter, 235 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 62 SdHoareTripleChecker+Valid, 165 SdHoareTripleChecker+Invalid, 238 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 235 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-12 00:11:49,977 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [62 Valid, 165 Invalid, 238 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 235 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-12 00:11:49,979 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2023-11-12 00:11:49,996 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 79. [2023-11-12 00:11:49,997 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 79 states, 70 states have (on average 1.1571428571428573) internal successors, (81), 72 states have internal predecessors, (81), 6 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (6), 4 states have call predecessors, (6), 6 states have call successors, (6) [2023-11-12 00:11:49,998 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 93 transitions. [2023-11-12 00:11:49,998 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 93 transitions. Word has length 47 [2023-11-12 00:11:49,998 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:11:49,998 INFO L495 AbstractCegarLoop]: Abstraction has 79 states and 93 transitions. [2023-11-12 00:11:49,999 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 41 states, 41 states have (on average 1.4146341463414633) internal successors, (58), 41 states have internal predecessors, (58), 1 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2023-11-12 00:11:49,999 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 93 transitions. [2023-11-12 00:11:49,999 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 55 [2023-11-12 00:11:50,000 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:11:50,000 INFO L195 NwaCegarLoop]: trace histogram [27, 10, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-12 00:11:50,012 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd2431dd-1b0b-4240-ad06-476f4e9d137c/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2023-11-12 00:11:50,205 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd2431dd-1b0b-4240-ad06-476f4e9d137c/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable8 [2023-11-12 00:11:50,205 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-12 00:11:50,206 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:11:50,206 INFO L85 PathProgramCache]: Analyzing trace with hash 950595180, now seen corresponding path program 6 times [2023-11-12 00:11:50,206 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:11:50,206 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [24734335] [2023-11-12 00:11:50,206 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:11:50,206 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:11:50,254 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:11:51,274 INFO L134 CoverageAnalysis]: Checked inductivity of 437 backedges. 2 proven. 378 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2023-11-12 00:11:51,275 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:11:51,275 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [24734335] [2023-11-12 00:11:51,275 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [24734335] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-12 00:11:51,275 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1169183657] [2023-11-12 00:11:51,275 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-11-12 00:11:51,275 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:11:51,275 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd2431dd-1b0b-4240-ad06-476f4e9d137c/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 00:11:51,280 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd2431dd-1b0b-4240-ad06-476f4e9d137c/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-12 00:11:51,304 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd2431dd-1b0b-4240-ad06-476f4e9d137c/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2023-11-12 00:11:51,443 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-11-12 00:11:51,443 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-12 00:11:51,446 INFO L262 TraceCheckSpWp]: Trace formula consists of 366 conjuncts, 29 conjunts are in the unsatisfiable core [2023-11-12 00:11:51,460 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-12 00:11:51,518 INFO L134 CoverageAnalysis]: Checked inductivity of 437 backedges. 0 proven. 378 refuted. 0 times theorem prover too weak. 59 trivial. 0 not checked. [2023-11-12 00:11:51,518 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-12 00:11:52,748 INFO L134 CoverageAnalysis]: Checked inductivity of 437 backedges. 2 proven. 378 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2023-11-12 00:11:52,748 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1169183657] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-12 00:11:52,748 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1946702869] [2023-11-12 00:11:52,751 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-11-12 00:11:52,751 INFO L166 IcfgInterpreter]: Building call graph [2023-11-12 00:11:52,751 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-12 00:11:52,751 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-12 00:11:52,752 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-12 00:11:52,950 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 6 for LOIs [2023-11-12 00:11:52,954 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-12 00:11:53,227 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3547#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0))' at error location [2023-11-12 00:11:53,228 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-12 00:11:53,228 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-12 00:11:53,228 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 29, 30] total 59 [2023-11-12 00:11:53,228 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [769060230] [2023-11-12 00:11:53,228 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-12 00:11:53,229 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 59 states [2023-11-12 00:11:53,229 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:11:53,231 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 59 interpolants. [2023-11-12 00:11:53,233 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1736, Invalid=2813, Unknown=7, NotChecked=0, Total=4556 [2023-11-12 00:11:53,233 INFO L87 Difference]: Start difference. First operand 79 states and 93 transitions. Second operand has 59 states, 59 states have (on average 1.2542372881355932) internal successors, (74), 59 states have internal predecessors, (74), 1 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2023-11-12 00:11:53,386 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:11:53,386 INFO L93 Difference]: Finished difference Result 158 states and 214 transitions. [2023-11-12 00:11:53,387 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 58 states. [2023-11-12 00:11:53,387 INFO L78 Accepts]: Start accepts. Automaton has has 59 states, 59 states have (on average 1.2542372881355932) internal successors, (74), 59 states have internal predecessors, (74), 1 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 54 [2023-11-12 00:11:53,387 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:11:53,388 INFO L225 Difference]: With dead ends: 158 [2023-11-12 00:11:53,389 INFO L226 Difference]: Without dead ends: 108 [2023-11-12 00:11:53,391 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 190 GetRequests, 124 SyntacticMatches, 0 SemanticMatches, 66 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 871 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=1736, Invalid=2813, Unknown=7, NotChecked=0, Total=4556 [2023-11-12 00:11:53,392 INFO L413 NwaCegarLoop]: 17 mSDtfsCounter, 0 mSDsluCounter, 68 mSDsCounter, 0 mSdLazyCounter, 113 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 85 SdHoareTripleChecker+Invalid, 114 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 113 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-12 00:11:53,392 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 85 Invalid, 114 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 113 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-12 00:11:53,393 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 108 states. [2023-11-12 00:11:53,409 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 108 to 108. [2023-11-12 00:11:53,409 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 108 states, 99 states have (on average 1.1111111111111112) internal successors, (110), 101 states have internal predecessors, (110), 6 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (6), 4 states have call predecessors, (6), 6 states have call successors, (6) [2023-11-12 00:11:53,410 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 108 states to 108 states and 122 transitions. [2023-11-12 00:11:53,410 INFO L78 Accepts]: Start accepts. Automaton has 108 states and 122 transitions. Word has length 54 [2023-11-12 00:11:53,411 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:11:53,411 INFO L495 AbstractCegarLoop]: Abstraction has 108 states and 122 transitions. [2023-11-12 00:11:53,411 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 59 states, 59 states have (on average 1.2542372881355932) internal successors, (74), 59 states have internal predecessors, (74), 1 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2023-11-12 00:11:53,411 INFO L276 IsEmpty]: Start isEmpty. Operand 108 states and 122 transitions. [2023-11-12 00:11:53,412 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 84 [2023-11-12 00:11:53,412 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:11:53,413 INFO L195 NwaCegarLoop]: trace histogram [56, 10, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-12 00:11:53,419 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd2431dd-1b0b-4240-ad06-476f4e9d137c/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2023-11-12 00:11:53,618 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd2431dd-1b0b-4240-ad06-476f4e9d137c/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2023-11-12 00:11:53,619 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-12 00:11:53,619 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:11:53,619 INFO L85 PathProgramCache]: Analyzing trace with hash -2145982652, now seen corresponding path program 7 times [2023-11-12 00:11:53,619 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:11:53,620 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [513039638] [2023-11-12 00:11:53,620 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:11:53,620 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:11:53,743 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:11:56,987 INFO L134 CoverageAnalysis]: Checked inductivity of 1655 backedges. 2 proven. 1596 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2023-11-12 00:11:56,987 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:11:56,987 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [513039638] [2023-11-12 00:11:56,987 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [513039638] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-12 00:11:56,987 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [636037867] [2023-11-12 00:11:56,987 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-11-12 00:11:56,987 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:11:56,988 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd2431dd-1b0b-4240-ad06-476f4e9d137c/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 00:11:56,989 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd2431dd-1b0b-4240-ad06-476f4e9d137c/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-12 00:11:56,995 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd2431dd-1b0b-4240-ad06-476f4e9d137c/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2023-11-12 00:11:57,220 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:11:57,224 INFO L262 TraceCheckSpWp]: Trace formula consists of 627 conjuncts, 58 conjunts are in the unsatisfiable core [2023-11-12 00:11:57,228 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-12 00:11:57,358 INFO L134 CoverageAnalysis]: Checked inductivity of 1655 backedges. 0 proven. 1596 refuted. 0 times theorem prover too weak. 59 trivial. 0 not checked. [2023-11-12 00:11:57,358 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-12 00:12:01,959 INFO L134 CoverageAnalysis]: Checked inductivity of 1655 backedges. 2 proven. 1596 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2023-11-12 00:12:01,959 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [636037867] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-12 00:12:01,959 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1244923494] [2023-11-12 00:12:01,965 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-11-12 00:12:01,965 INFO L166 IcfgInterpreter]: Building call graph [2023-11-12 00:12:01,965 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-12 00:12:01,966 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-12 00:12:01,966 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-12 00:12:02,167 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 6 for LOIs [2023-11-12 00:12:02,171 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-12 00:12:02,599 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4659#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0))' at error location [2023-11-12 00:12:02,599 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-12 00:12:02,599 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-12 00:12:02,599 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [59, 58, 59] total 117 [2023-11-12 00:12:02,600 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1966481637] [2023-11-12 00:12:02,600 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-12 00:12:02,601 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 117 states [2023-11-12 00:12:02,601 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:12:02,604 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 117 interpolants. [2023-11-12 00:12:02,610 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6811, Invalid=8938, Unknown=1, NotChecked=0, Total=15750 [2023-11-12 00:12:02,611 INFO L87 Difference]: Start difference. First operand 108 states and 122 transitions. Second operand has 117 states, 117 states have (on average 1.1282051282051282) internal successors, (132), 117 states have internal predecessors, (132), 1 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2023-11-12 00:12:02,875 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-12 00:12:02,876 INFO L93 Difference]: Finished difference Result 216 states and 301 transitions. [2023-11-12 00:12:02,876 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 116 states. [2023-11-12 00:12:02,876 INFO L78 Accepts]: Start accepts. Automaton has has 117 states, 117 states have (on average 1.1282051282051282) internal successors, (132), 117 states have internal predecessors, (132), 1 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 83 [2023-11-12 00:12:02,877 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-12 00:12:02,878 INFO L225 Difference]: With dead ends: 216 [2023-11-12 00:12:02,878 INFO L226 Difference]: Without dead ends: 166 [2023-11-12 00:12:02,884 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 306 GetRequests, 182 SyntacticMatches, 0 SemanticMatches, 124 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1773 ImplicationChecksByTransitivity, 6.5s TimeCoverageRelationStatistics Valid=6811, Invalid=8938, Unknown=1, NotChecked=0, Total=15750 [2023-11-12 00:12:02,885 INFO L413 NwaCegarLoop]: 17 mSDtfsCounter, 0 mSDsluCounter, 119 mSDsCounter, 0 mSdLazyCounter, 204 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 136 SdHoareTripleChecker+Invalid, 205 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 204 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-12 00:12:02,885 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 136 Invalid, 205 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 204 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-12 00:12:02,886 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 166 states. [2023-11-12 00:12:02,908 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 166 to 166. [2023-11-12 00:12:02,908 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 166 states, 157 states have (on average 1.070063694267516) internal successors, (168), 159 states have internal predecessors, (168), 6 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (6), 4 states have call predecessors, (6), 6 states have call successors, (6) [2023-11-12 00:12:02,909 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 166 states to 166 states and 180 transitions. [2023-11-12 00:12:02,910 INFO L78 Accepts]: Start accepts. Automaton has 166 states and 180 transitions. Word has length 83 [2023-11-12 00:12:02,910 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-12 00:12:02,910 INFO L495 AbstractCegarLoop]: Abstraction has 166 states and 180 transitions. [2023-11-12 00:12:02,911 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 117 states, 117 states have (on average 1.1282051282051282) internal successors, (132), 117 states have internal predecessors, (132), 1 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2023-11-12 00:12:02,911 INFO L276 IsEmpty]: Start isEmpty. Operand 166 states and 180 transitions. [2023-11-12 00:12:02,912 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 142 [2023-11-12 00:12:02,912 INFO L187 NwaCegarLoop]: Found error trace [2023-11-12 00:12:02,912 INFO L195 NwaCegarLoop]: trace histogram [114, 10, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-12 00:12:02,923 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd2431dd-1b0b-4240-ad06-476f4e9d137c/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Ended with exit code 0 [2023-11-12 00:12:03,118 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd2431dd-1b0b-4240-ad06-476f4e9d137c/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2023-11-12 00:12:03,119 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting __VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION === [__VERIFIER_assertErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-12 00:12:03,119 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-12 00:12:03,119 INFO L85 PathProgramCache]: Analyzing trace with hash 1890154564, now seen corresponding path program 8 times [2023-11-12 00:12:03,119 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-12 00:12:03,119 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1782957840] [2023-11-12 00:12:03,119 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-12 00:12:03,119 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-12 00:12:03,284 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-12 00:12:13,385 INFO L134 CoverageAnalysis]: Checked inductivity of 6614 backedges. 2 proven. 6555 refuted. 0 times theorem prover too weak. 57 trivial. 0 not checked. [2023-11-12 00:12:13,385 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-12 00:12:13,385 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1782957840] [2023-11-12 00:12:13,385 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1782957840] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-12 00:12:13,385 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [590056565] [2023-11-12 00:12:13,386 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-12 00:12:13,386 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-12 00:12:13,386 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd2431dd-1b0b-4240-ad06-476f4e9d137c/bin/utaipan-verify-NcY6lQBIFX/z3 [2023-11-12 00:12:13,387 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd2431dd-1b0b-4240-ad06-476f4e9d137c/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-12 00:12:13,388 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_fd2431dd-1b0b-4240-ad06-476f4e9d137c/bin/utaipan-verify-NcY6lQBIFX/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2023-11-12 00:12:13,694 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2023-11-12 00:12:13,694 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-12 00:12:13,698 INFO L262 TraceCheckSpWp]: Trace formula consists of 213 conjuncts, 13 conjunts are in the unsatisfiable core [2023-11-12 00:12:13,702 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-12 00:12:14,384 INFO L134 CoverageAnalysis]: Checked inductivity of 6614 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 6559 trivial. 0 not checked. [2023-11-12 00:12:14,384 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-12 00:12:15,228 INFO L134 CoverageAnalysis]: Checked inductivity of 6614 backedges. 2 proven. 55 refuted. 0 times theorem prover too weak. 6557 trivial. 0 not checked. [2023-11-12 00:12:15,228 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [590056565] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-12 00:12:15,228 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2071734083] [2023-11-12 00:12:15,231 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-11-12 00:12:15,231 INFO L166 IcfgInterpreter]: Building call graph [2023-11-12 00:12:15,231 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-12 00:12:15,231 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-12 00:12:15,232 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-12 00:12:15,430 INFO L197 IcfgInterpreter]: Interpreting procedure __VERIFIER_assert with input of size 6 for LOIs [2023-11-12 00:12:15,436 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-12 00:12:16,229 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '6375#(and (= |__VERIFIER_assert_#in~cond| 0) (= __VERIFIER_assert_~cond 0))' at error location [2023-11-12 00:12:16,229 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-12 00:12:16,229 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-12 00:12:16,229 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [117, 14, 14] total 141 [2023-11-12 00:12:16,229 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1380350521] [2023-11-12 00:12:16,229 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-12 00:12:16,230 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 141 states [2023-11-12 00:12:16,230 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-12 00:12:16,233 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 141 interpolants. [2023-11-12 00:12:16,237 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7099, Invalid=15246, Unknown=5, NotChecked=0, Total=22350 [2023-11-12 00:12:16,238 INFO L87 Difference]: Start difference. First operand 166 states and 180 transitions. Second operand has 141 states, 141 states have (on average 1.1205673758865249) internal successors, (158), 141 states have internal predecessors, (158), 1 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2)