./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/array-crafted/zero_sum_const3.c --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version a0165632 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_627c9d95-6587-4b89-802d-015e259dbc56/bin/utaipan-verify-YMUCfTKeje/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_627c9d95-6587-4b89-802d-015e259dbc56/bin/utaipan-verify-YMUCfTKeje/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_627c9d95-6587-4b89-802d-015e259dbc56/bin/utaipan-verify-YMUCfTKeje/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_627c9d95-6587-4b89-802d-015e259dbc56/bin/utaipan-verify-YMUCfTKeje/config/TaipanReach.xml -i ../../sv-benchmarks/c/array-crafted/zero_sum_const3.c -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_627c9d95-6587-4b89-802d-015e259dbc56/bin/utaipan-verify-YMUCfTKeje/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_627c9d95-6587-4b89-802d-015e259dbc56/bin/utaipan-verify-YMUCfTKeje --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 4a8466707e2bff30c44c48996d40a42275ef25007ed8ba21de1de20ade9b7ba9 --- Real Ultimate output --- This is Ultimate 0.2.5-dev-a016563 [2024-11-09 06:44:59,582 INFO L188 SettingsManager]: Resetting all preferences to default values... [2024-11-09 06:44:59,692 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_627c9d95-6587-4b89-802d-015e259dbc56/bin/utaipan-verify-YMUCfTKeje/config/svcomp-Reach-32bit-Taipan_Default.epf [2024-11-09 06:44:59,702 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2024-11-09 06:44:59,703 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2024-11-09 06:44:59,740 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2024-11-09 06:44:59,741 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2024-11-09 06:44:59,741 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2024-11-09 06:44:59,742 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2024-11-09 06:44:59,742 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2024-11-09 06:44:59,742 INFO L153 SettingsManager]: * User list type=DISABLED [2024-11-09 06:44:59,743 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2024-11-09 06:44:59,746 INFO L153 SettingsManager]: * Explicit value domain=true [2024-11-09 06:44:59,748 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2024-11-09 06:44:59,748 INFO L153 SettingsManager]: * Octagon Domain=false [2024-11-09 06:44:59,748 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2024-11-09 06:44:59,749 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2024-11-09 06:44:59,749 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2024-11-09 06:44:59,750 INFO L153 SettingsManager]: * Interval Domain=false [2024-11-09 06:44:59,750 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2024-11-09 06:44:59,754 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2024-11-09 06:44:59,754 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2024-11-09 06:44:59,755 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2024-11-09 06:44:59,755 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2024-11-09 06:44:59,756 INFO L153 SettingsManager]: * sizeof long=4 [2024-11-09 06:44:59,756 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2024-11-09 06:44:59,756 INFO L153 SettingsManager]: * sizeof POINTER=4 [2024-11-09 06:44:59,757 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2024-11-09 06:44:59,757 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2024-11-09 06:44:59,757 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2024-11-09 06:44:59,757 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2024-11-09 06:44:59,758 INFO L153 SettingsManager]: * Allow undefined functions=false [2024-11-09 06:44:59,761 INFO L153 SettingsManager]: * sizeof long double=12 [2024-11-09 06:44:59,761 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2024-11-09 06:44:59,762 INFO L153 SettingsManager]: * Use constant arrays=true [2024-11-09 06:44:59,762 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2024-11-09 06:44:59,763 INFO L153 SettingsManager]: * Only consider context switches at boundaries of atomic blocks=true [2024-11-09 06:44:59,763 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2024-11-09 06:44:59,763 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2024-11-09 06:44:59,763 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2024-11-09 06:44:59,764 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2024-11-09 06:44:59,764 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2024-11-09 06:44:59,764 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2024-11-09 06:44:59,765 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2024-11-09 06:44:59,765 INFO L153 SettingsManager]: * Apply one-shot large block encoding in concurrent analysis=false [2024-11-09 06:44:59,765 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2024-11-09 06:44:59,765 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2024-11-09 06:44:59,765 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_627c9d95-6587-4b89-802d-015e259dbc56/bin/utaipan-verify-YMUCfTKeje/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_627c9d95-6587-4b89-802d-015e259dbc56/bin/utaipan-verify-YMUCfTKeje Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 4a8466707e2bff30c44c48996d40a42275ef25007ed8ba21de1de20ade9b7ba9 [2024-11-09 06:45:00,035 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2024-11-09 06:45:00,066 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2024-11-09 06:45:00,069 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2024-11-09 06:45:00,072 INFO L270 PluginConnector]: Initializing CDTParser... [2024-11-09 06:45:00,072 INFO L274 PluginConnector]: CDTParser initialized [2024-11-09 06:45:00,074 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_627c9d95-6587-4b89-802d-015e259dbc56/bin/utaipan-verify-YMUCfTKeje/../../sv-benchmarks/c/array-crafted/zero_sum_const3.c Unable to find full path for "g++" [2024-11-09 06:45:02,031 INFO L533 CDTParser]: Created temporary CDT project at NULL [2024-11-09 06:45:02,217 INFO L384 CDTParser]: Found 1 translation units. [2024-11-09 06:45:02,219 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_627c9d95-6587-4b89-802d-015e259dbc56/sv-benchmarks/c/array-crafted/zero_sum_const3.c [2024-11-09 06:45:02,228 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_627c9d95-6587-4b89-802d-015e259dbc56/bin/utaipan-verify-YMUCfTKeje/data/37a459218/469a1ee9b1034438b07f583873f4785a/FLAG46322509d [2024-11-09 06:45:02,597 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_627c9d95-6587-4b89-802d-015e259dbc56/bin/utaipan-verify-YMUCfTKeje/data/37a459218/469a1ee9b1034438b07f583873f4785a [2024-11-09 06:45:02,600 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2024-11-09 06:45:02,604 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2024-11-09 06:45:02,605 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2024-11-09 06:45:02,605 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2024-11-09 06:45:02,612 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2024-11-09 06:45:02,615 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 09.11 06:45:02" (1/1) ... [2024-11-09 06:45:02,616 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3ad01bf and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.11 06:45:02, skipping insertion in model container [2024-11-09 06:45:02,617 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 09.11 06:45:02" (1/1) ... [2024-11-09 06:45:02,646 INFO L175 MainTranslator]: Built tables and reachable declarations [2024-11-09 06:45:02,851 WARN L250 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_627c9d95-6587-4b89-802d-015e259dbc56/sv-benchmarks/c/array-crafted/zero_sum_const3.c[406,419] [2024-11-09 06:45:02,878 INFO L210 PostProcessor]: Analyzing one entry point: main [2024-11-09 06:45:02,888 INFO L200 MainTranslator]: Completed pre-run [2024-11-09 06:45:02,902 WARN L250 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_627c9d95-6587-4b89-802d-015e259dbc56/sv-benchmarks/c/array-crafted/zero_sum_const3.c[406,419] [2024-11-09 06:45:02,912 INFO L210 PostProcessor]: Analyzing one entry point: main [2024-11-09 06:45:02,931 INFO L204 MainTranslator]: Completed translation [2024-11-09 06:45:02,932 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.11 06:45:02 WrapperNode [2024-11-09 06:45:02,932 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2024-11-09 06:45:02,933 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2024-11-09 06:45:02,934 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2024-11-09 06:45:02,934 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2024-11-09 06:45:02,940 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.11 06:45:02" (1/1) ... [2024-11-09 06:45:02,946 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.11 06:45:02" (1/1) ... [2024-11-09 06:45:02,964 INFO L138 Inliner]: procedures = 16, calls = 16, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 98 [2024-11-09 06:45:02,964 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2024-11-09 06:45:02,965 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2024-11-09 06:45:02,965 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2024-11-09 06:45:02,965 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2024-11-09 06:45:02,976 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.11 06:45:02" (1/1) ... [2024-11-09 06:45:02,977 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.11 06:45:02" (1/1) ... [2024-11-09 06:45:02,979 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.11 06:45:02" (1/1) ... [2024-11-09 06:45:02,980 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.11 06:45:02" (1/1) ... [2024-11-09 06:45:02,985 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.11 06:45:02" (1/1) ... [2024-11-09 06:45:02,989 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.11 06:45:02" (1/1) ... [2024-11-09 06:45:02,991 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.11 06:45:02" (1/1) ... [2024-11-09 06:45:02,992 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.11 06:45:02" (1/1) ... [2024-11-09 06:45:02,994 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2024-11-09 06:45:02,995 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2024-11-09 06:45:02,995 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2024-11-09 06:45:02,996 INFO L274 PluginConnector]: RCFGBuilder initialized [2024-11-09 06:45:02,997 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.11 06:45:02" (1/1) ... [2024-11-09 06:45:03,010 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2024-11-09 06:45:03,021 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_627c9d95-6587-4b89-802d-015e259dbc56/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 06:45:03,035 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_627c9d95-6587-4b89-802d-015e259dbc56/bin/utaipan-verify-YMUCfTKeje/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2024-11-09 06:45:03,037 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_627c9d95-6587-4b89-802d-015e259dbc56/bin/utaipan-verify-YMUCfTKeje/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2024-11-09 06:45:03,070 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2024-11-09 06:45:03,071 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2024-11-09 06:45:03,071 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2024-11-09 06:45:03,073 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2024-11-09 06:45:03,073 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2024-11-09 06:45:03,073 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2024-11-09 06:45:03,073 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2024-11-09 06:45:03,166 INFO L238 CfgBuilder]: Building ICFG [2024-11-09 06:45:03,169 INFO L264 CfgBuilder]: Building CFG for each procedure with an implementation [2024-11-09 06:45:03,485 INFO L? ?]: Removed 20 outVars from TransFormulas that were not future-live. [2024-11-09 06:45:03,485 INFO L287 CfgBuilder]: Performing block encoding [2024-11-09 06:45:03,523 INFO L311 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2024-11-09 06:45:03,523 INFO L316 CfgBuilder]: Removed 0 assume(true) statements. [2024-11-09 06:45:03,523 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 09.11 06:45:03 BoogieIcfgContainer [2024-11-09 06:45:03,523 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2024-11-09 06:45:03,527 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2024-11-09 06:45:03,528 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2024-11-09 06:45:03,532 INFO L274 PluginConnector]: TraceAbstraction initialized [2024-11-09 06:45:03,532 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 09.11 06:45:02" (1/3) ... [2024-11-09 06:45:03,533 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@550ab6b0 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 09.11 06:45:03, skipping insertion in model container [2024-11-09 06:45:03,533 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 09.11 06:45:02" (2/3) ... [2024-11-09 06:45:03,533 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@550ab6b0 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 09.11 06:45:03, skipping insertion in model container [2024-11-09 06:45:03,534 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 09.11 06:45:03" (3/3) ... [2024-11-09 06:45:03,535 INFO L112 eAbstractionObserver]: Analyzing ICFG zero_sum_const3.c [2024-11-09 06:45:03,555 INFO L214 ceAbstractionStarter]: Automizer settings: Hoare:LoopHeads NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2024-11-09 06:45:03,556 INFO L154 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2024-11-09 06:45:03,636 INFO L332 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2024-11-09 06:45:03,644 INFO L333 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, 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;@6395aedb, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2024-11-09 06:45:03,645 INFO L334 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2024-11-09 06:45:03,650 INFO L276 IsEmpty]: Start isEmpty. Operand has 29 states, 27 states have (on average 1.6296296296296295) internal successors, (44), 28 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-09 06:45:03,656 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2024-11-09 06:45:03,656 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 06:45:03,657 INFO L215 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-09 06:45:03,658 INFO L396 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 06:45:03,666 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 06:45:03,666 INFO L85 PathProgramCache]: Analyzing trace with hash 1288797282, now seen corresponding path program 1 times [2024-11-09 06:45:03,678 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 06:45:03,678 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1191284457] [2024-11-09 06:45:03,679 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 06:45:03,679 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 06:45:03,816 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 06:45:04,033 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 06:45:04,034 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 06:45:04,034 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1191284457] [2024-11-09 06:45:04,035 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1191284457] provided 1 perfect and 0 imperfect interpolant sequences [2024-11-09 06:45:04,035 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2024-11-09 06:45:04,035 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2024-11-09 06:45:04,038 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1337610714] [2024-11-09 06:45:04,039 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2024-11-09 06:45:04,042 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2024-11-09 06:45:04,043 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 06:45:04,070 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2024-11-09 06:45:04,070 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2024-11-09 06:45:04,072 INFO L87 Difference]: Start difference. First operand has 29 states, 27 states have (on average 1.6296296296296295) internal successors, (44), 28 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 3 states, 3 states have (on average 6.0) internal successors, (18), 3 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-09 06:45:04,181 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 06:45:04,181 INFO L93 Difference]: Finished difference Result 56 states and 85 transitions. [2024-11-09 06:45:04,183 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2024-11-09 06:45:04,184 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 6.0) internal successors, (18), 3 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 18 [2024-11-09 06:45:04,184 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 06:45:04,193 INFO L225 Difference]: With dead ends: 56 [2024-11-09 06:45:04,193 INFO L226 Difference]: Without dead ends: 28 [2024-11-09 06:45:04,196 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2024-11-09 06:45:04,200 INFO L432 NwaCegarLoop]: 39 mSDtfsCounter, 1 mSDsluCounter, 4 mSDsCounter, 0 mSdLazyCounter, 42 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 43 SdHoareTripleChecker+Invalid, 43 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 42 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2024-11-09 06:45:04,201 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [1 Valid, 43 Invalid, 43 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 42 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2024-11-09 06:45:04,220 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 28 states. [2024-11-09 06:45:04,243 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 28 to 28. [2024-11-09 06:45:04,245 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 28 states, 27 states have (on average 1.5185185185185186) internal successors, (41), 27 states have internal predecessors, (41), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-09 06:45:04,247 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 28 states to 28 states and 41 transitions. [2024-11-09 06:45:04,249 INFO L78 Accepts]: Start accepts. Automaton has 28 states and 41 transitions. Word has length 18 [2024-11-09 06:45:04,249 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 06:45:04,250 INFO L471 AbstractCegarLoop]: Abstraction has 28 states and 41 transitions. [2024-11-09 06:45:04,250 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 6.0) internal successors, (18), 3 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-09 06:45:04,250 INFO L276 IsEmpty]: Start isEmpty. Operand 28 states and 41 transitions. [2024-11-09 06:45:04,251 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2024-11-09 06:45:04,251 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 06:45:04,252 INFO L215 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-09 06:45:04,252 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2024-11-09 06:45:04,252 INFO L396 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 06:45:04,253 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 06:45:04,253 INFO L85 PathProgramCache]: Analyzing trace with hash 845702919, now seen corresponding path program 1 times [2024-11-09 06:45:04,254 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 06:45:04,254 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [608200369] [2024-11-09 06:45:04,254 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 06:45:04,255 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 06:45:04,289 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 06:45:04,392 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2024-11-09 06:45:04,392 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 06:45:04,392 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [608200369] [2024-11-09 06:45:04,393 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [608200369] provided 1 perfect and 0 imperfect interpolant sequences [2024-11-09 06:45:04,393 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2024-11-09 06:45:04,393 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2024-11-09 06:45:04,393 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1506913951] [2024-11-09 06:45:04,394 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2024-11-09 06:45:04,395 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2024-11-09 06:45:04,395 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 06:45:04,399 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2024-11-09 06:45:04,399 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2024-11-09 06:45:04,400 INFO L87 Difference]: Start difference. First operand 28 states and 41 transitions. Second operand has 4 states, 4 states have (on average 5.0) internal successors, (20), 4 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-09 06:45:04,543 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 06:45:04,543 INFO L93 Difference]: Finished difference Result 59 states and 93 transitions. [2024-11-09 06:45:04,543 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2024-11-09 06:45:04,544 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 5.0) internal successors, (20), 4 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2024-11-09 06:45:04,544 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 06:45:04,545 INFO L225 Difference]: With dead ends: 59 [2024-11-09 06:45:04,545 INFO L226 Difference]: Without dead ends: 40 [2024-11-09 06:45:04,545 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=6, Invalid=6, Unknown=0, NotChecked=0, Total=12 [2024-11-09 06:45:04,547 INFO L432 NwaCegarLoop]: 10 mSDtfsCounter, 41 mSDsluCounter, 3 mSDsCounter, 0 mSdLazyCounter, 59 mSolverCounterSat, 17 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 41 SdHoareTripleChecker+Valid, 13 SdHoareTripleChecker+Invalid, 76 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 17 IncrementalHoareTripleChecker+Valid, 59 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2024-11-09 06:45:04,547 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [41 Valid, 13 Invalid, 76 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [17 Valid, 59 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2024-11-09 06:45:04,548 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 40 states. [2024-11-09 06:45:04,554 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 40 to 40. [2024-11-09 06:45:04,554 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 40 states, 39 states have (on average 1.358974358974359) internal successors, (53), 39 states have internal predecessors, (53), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-09 06:45:04,555 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 40 states to 40 states and 53 transitions. [2024-11-09 06:45:04,556 INFO L78 Accepts]: Start accepts. Automaton has 40 states and 53 transitions. Word has length 20 [2024-11-09 06:45:04,556 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 06:45:04,556 INFO L471 AbstractCegarLoop]: Abstraction has 40 states and 53 transitions. [2024-11-09 06:45:04,557 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 5.0) internal successors, (20), 4 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-09 06:45:04,557 INFO L276 IsEmpty]: Start isEmpty. Operand 40 states and 53 transitions. [2024-11-09 06:45:04,558 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 33 [2024-11-09 06:45:04,558 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 06:45:04,558 INFO L215 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-09 06:45:04,558 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2024-11-09 06:45:04,559 INFO L396 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 06:45:04,559 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 06:45:04,559 INFO L85 PathProgramCache]: Analyzing trace with hash 1718447749, now seen corresponding path program 1 times [2024-11-09 06:45:04,560 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 06:45:04,560 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [884568328] [2024-11-09 06:45:04,560 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 06:45:04,560 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 06:45:04,621 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 06:45:04,798 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2024-11-09 06:45:04,798 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 06:45:04,798 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [884568328] [2024-11-09 06:45:04,799 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [884568328] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-09 06:45:04,799 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [463345116] [2024-11-09 06:45:04,799 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 06:45:04,799 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 06:45:04,800 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_627c9d95-6587-4b89-802d-015e259dbc56/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 06:45:04,802 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_627c9d95-6587-4b89-802d-015e259dbc56/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 06:45:04,804 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_627c9d95-6587-4b89-802d-015e259dbc56/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2024-11-09 06:45:04,902 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 06:45:04,904 INFO L255 TraceCheckSpWp]: Trace formula consists of 113 conjuncts, 4 conjuncts are in the unsatisfiable core [2024-11-09 06:45:04,909 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 06:45:04,987 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2024-11-09 06:45:04,987 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-09 06:45:05,022 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2024-11-09 06:45:05,023 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [463345116] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-09 06:45:05,023 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [6378373] [2024-11-09 06:45:05,045 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2024-11-09 06:45:05,046 INFO L166 IcfgInterpreter]: Building call graph [2024-11-09 06:45:05,052 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-09 06:45:05,059 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-09 06:45:05,060 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-09 06:45:07,927 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-09 06:45:08,819 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '279#true' at error location [2024-11-09 06:45:08,819 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-09 06:45:08,820 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-09 06:45:08,820 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 7 [2024-11-09 06:45:08,820 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1256350353] [2024-11-09 06:45:08,821 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-09 06:45:08,821 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2024-11-09 06:45:08,821 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 06:45:08,824 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2024-11-09 06:45:08,825 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=104, Invalid=358, Unknown=0, NotChecked=0, Total=462 [2024-11-09 06:45:08,825 INFO L87 Difference]: Start difference. First operand 40 states and 53 transitions. Second operand has 7 states, 7 states have (on average 5.571428571428571) internal successors, (39), 7 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-09 06:45:08,963 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 06:45:08,964 INFO L93 Difference]: Finished difference Result 76 states and 102 transitions. [2024-11-09 06:45:08,965 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2024-11-09 06:45:08,966 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 5.571428571428571) internal successors, (39), 7 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 32 [2024-11-09 06:45:08,966 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 06:45:08,967 INFO L225 Difference]: With dead ends: 76 [2024-11-09 06:45:08,967 INFO L226 Difference]: Without dead ends: 42 [2024-11-09 06:45:08,967 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 98 GetRequests, 73 SyntacticMatches, 5 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 148 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=104, Invalid=358, Unknown=0, NotChecked=0, Total=462 [2024-11-09 06:45:08,968 INFO L432 NwaCegarLoop]: 23 mSDtfsCounter, 2 mSDsluCounter, 9 mSDsCounter, 0 mSdLazyCounter, 101 mSolverCounterSat, 15 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 32 SdHoareTripleChecker+Invalid, 116 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 15 IncrementalHoareTripleChecker+Valid, 101 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2024-11-09 06:45:08,971 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [2 Valid, 32 Invalid, 116 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [15 Valid, 101 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2024-11-09 06:45:08,972 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 42 states. [2024-11-09 06:45:08,977 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 42 to 35. [2024-11-09 06:45:08,978 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 35 states, 34 states have (on average 1.2058823529411764) internal successors, (41), 34 states have internal predecessors, (41), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-09 06:45:08,978 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 35 states to 35 states and 41 transitions. [2024-11-09 06:45:08,978 INFO L78 Accepts]: Start accepts. Automaton has 35 states and 41 transitions. Word has length 32 [2024-11-09 06:45:08,979 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 06:45:08,979 INFO L471 AbstractCegarLoop]: Abstraction has 35 states and 41 transitions. [2024-11-09 06:45:08,979 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 5.571428571428571) internal successors, (39), 7 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-09 06:45:08,979 INFO L276 IsEmpty]: Start isEmpty. Operand 35 states and 41 transitions. [2024-11-09 06:45:08,982 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 35 [2024-11-09 06:45:08,982 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 06:45:08,982 INFO L215 NwaCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-09 06:45:09,003 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_627c9d95-6587-4b89-802d-015e259dbc56/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2024-11-09 06:45:09,183 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_627c9d95-6587-4b89-802d-015e259dbc56/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 06:45:09,183 INFO L396 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 06:45:09,184 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 06:45:09,184 INFO L85 PathProgramCache]: Analyzing trace with hash 1192121450, now seen corresponding path program 2 times [2024-11-09 06:45:09,184 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 06:45:09,184 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [166272855] [2024-11-09 06:45:09,184 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 06:45:09,185 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 06:45:09,228 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 06:45:09,371 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2024-11-09 06:45:09,372 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 06:45:09,372 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [166272855] [2024-11-09 06:45:09,372 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [166272855] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-09 06:45:09,373 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1052881211] [2024-11-09 06:45:09,373 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2024-11-09 06:45:09,377 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 06:45:09,377 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_627c9d95-6587-4b89-802d-015e259dbc56/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 06:45:09,381 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_627c9d95-6587-4b89-802d-015e259dbc56/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 06:45:09,383 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_627c9d95-6587-4b89-802d-015e259dbc56/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2024-11-09 06:45:09,456 INFO L227 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2024-11-09 06:45:09,456 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-09 06:45:09,461 INFO L255 TraceCheckSpWp]: Trace formula consists of 113 conjuncts, 4 conjuncts are in the unsatisfiable core [2024-11-09 06:45:09,462 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 06:45:09,513 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2024-11-09 06:45:09,514 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-09 06:45:09,553 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2024-11-09 06:45:09,554 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1052881211] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-09 06:45:09,554 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1019993953] [2024-11-09 06:45:09,557 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2024-11-09 06:45:09,561 INFO L166 IcfgInterpreter]: Building call graph [2024-11-09 06:45:09,561 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-09 06:45:09,562 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-09 06:45:09,562 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-09 06:45:11,213 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-09 06:45:11,911 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '640#true' at error location [2024-11-09 06:45:11,911 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-09 06:45:11,912 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-09 06:45:11,912 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 8 [2024-11-09 06:45:11,912 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1658616948] [2024-11-09 06:45:11,912 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-09 06:45:11,913 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2024-11-09 06:45:11,913 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 06:45:11,913 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2024-11-09 06:45:11,914 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=116, Invalid=390, Unknown=0, NotChecked=0, Total=506 [2024-11-09 06:45:11,914 INFO L87 Difference]: Start difference. First operand 35 states and 41 transitions. Second operand has 8 states, 8 states have (on average 4.875) internal successors, (39), 8 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-09 06:45:12,075 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 06:45:12,076 INFO L93 Difference]: Finished difference Result 78 states and 94 transitions. [2024-11-09 06:45:12,077 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2024-11-09 06:45:12,077 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 4.875) internal successors, (39), 8 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 34 [2024-11-09 06:45:12,077 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 06:45:12,078 INFO L225 Difference]: With dead ends: 78 [2024-11-09 06:45:12,079 INFO L226 Difference]: Without dead ends: 54 [2024-11-09 06:45:12,080 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 106 GetRequests, 77 SyntacticMatches, 7 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 246 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=124, Invalid=428, Unknown=0, NotChecked=0, Total=552 [2024-11-09 06:45:12,082 INFO L432 NwaCegarLoop]: 10 mSDtfsCounter, 74 mSDsluCounter, 3 mSDsCounter, 0 mSdLazyCounter, 87 mSolverCounterSat, 36 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 74 SdHoareTripleChecker+Valid, 13 SdHoareTripleChecker+Invalid, 123 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 36 IncrementalHoareTripleChecker+Valid, 87 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2024-11-09 06:45:12,084 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [74 Valid, 13 Invalid, 123 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [36 Valid, 87 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2024-11-09 06:45:12,085 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 54 states. [2024-11-09 06:45:12,091 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 54 to 47. [2024-11-09 06:45:12,095 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 47 states, 46 states have (on average 1.1521739130434783) internal successors, (53), 46 states have internal predecessors, (53), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-09 06:45:12,095 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 47 states to 47 states and 53 transitions. [2024-11-09 06:45:12,096 INFO L78 Accepts]: Start accepts. Automaton has 47 states and 53 transitions. Word has length 34 [2024-11-09 06:45:12,099 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 06:45:12,099 INFO L471 AbstractCegarLoop]: Abstraction has 47 states and 53 transitions. [2024-11-09 06:45:12,099 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 4.875) internal successors, (39), 8 states have internal predecessors, (39), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-09 06:45:12,099 INFO L276 IsEmpty]: Start isEmpty. Operand 47 states and 53 transitions. [2024-11-09 06:45:12,100 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 47 [2024-11-09 06:45:12,100 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 06:45:12,100 INFO L215 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-09 06:45:12,122 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_627c9d95-6587-4b89-802d-015e259dbc56/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2024-11-09 06:45:12,305 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_627c9d95-6587-4b89-802d-015e259dbc56/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 06:45:12,305 INFO L396 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 06:45:12,306 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 06:45:12,306 INFO L85 PathProgramCache]: Analyzing trace with hash 1640408936, now seen corresponding path program 3 times [2024-11-09 06:45:12,306 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 06:45:12,306 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1152710977] [2024-11-09 06:45:12,306 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 06:45:12,307 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 06:45:12,432 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 06:45:14,992 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 28 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 06:45:14,992 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 06:45:14,992 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1152710977] [2024-11-09 06:45:14,992 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1152710977] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-09 06:45:14,993 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2109512866] [2024-11-09 06:45:14,993 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2024-11-09 06:45:14,993 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 06:45:14,993 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_627c9d95-6587-4b89-802d-015e259dbc56/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 06:45:14,999 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_627c9d95-6587-4b89-802d-015e259dbc56/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 06:45:15,003 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_627c9d95-6587-4b89-802d-015e259dbc56/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2024-11-09 06:45:15,096 INFO L227 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2024-11-09 06:45:15,096 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-09 06:45:15,098 INFO L255 TraceCheckSpWp]: Trace formula consists of 157 conjuncts, 58 conjuncts are in the unsatisfiable core [2024-11-09 06:45:15,103 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 06:45:15,503 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 24 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2024-11-09 06:45:15,503 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-09 06:45:15,806 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2024-11-09 06:45:15,808 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 4 select indices, 4 select index equivalence classes, 0 disjoint index pairs (out of 6 index pairs), introduced 4 new quantified variables, introduced 6 case distinctions, treesize of input 35 treesize of output 43 [2024-11-09 06:45:15,914 INFO L134 CoverageAnalysis]: Checked inductivity of 28 backedges. 0 proven. 24 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2024-11-09 06:45:15,915 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2109512866] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-09 06:45:15,915 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1755633711] [2024-11-09 06:45:15,917 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2024-11-09 06:45:15,918 INFO L166 IcfgInterpreter]: Building call graph [2024-11-09 06:45:15,920 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-09 06:45:15,920 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-09 06:45:15,920 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-09 06:45:17,358 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-09 06:45:18,443 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1040#true' at error location [2024-11-09 06:45:18,443 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-09 06:45:18,444 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-09 06:45:18,444 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 10, 10] total 25 [2024-11-09 06:45:18,444 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1193367601] [2024-11-09 06:45:18,444 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-09 06:45:18,445 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2024-11-09 06:45:18,445 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 06:45:18,446 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2024-11-09 06:45:18,446 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=177, Invalid=1383, Unknown=0, NotChecked=0, Total=1560 [2024-11-09 06:45:18,447 INFO L87 Difference]: Start difference. First operand 47 states and 53 transitions. Second operand has 25 states, 25 states have (on average 5.04) internal successors, (126), 25 states have internal predecessors, (126), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-09 06:45:18,887 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 06:45:18,887 INFO L93 Difference]: Finished difference Result 90 states and 101 transitions. [2024-11-09 06:45:18,888 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2024-11-09 06:45:18,888 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 5.04) internal successors, (126), 25 states have internal predecessors, (126), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 46 [2024-11-09 06:45:18,888 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 06:45:18,889 INFO L225 Difference]: With dead ends: 90 [2024-11-09 06:45:18,889 INFO L226 Difference]: Without dead ends: 86 [2024-11-09 06:45:18,890 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 162 GetRequests, 118 SyntacticMatches, 4 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 505 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=190, Invalid=1532, Unknown=0, NotChecked=0, Total=1722 [2024-11-09 06:45:18,890 INFO L432 NwaCegarLoop]: 23 mSDtfsCounter, 12 mSDsluCounter, 110 mSDsCounter, 0 mSdLazyCounter, 468 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 133 SdHoareTripleChecker+Invalid, 471 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 468 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2024-11-09 06:45:18,891 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [12 Valid, 133 Invalid, 471 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 468 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2024-11-09 06:45:18,891 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86 states. [2024-11-09 06:45:18,899 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 76. [2024-11-09 06:45:18,900 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 76 states, 75 states have (on average 1.16) internal successors, (87), 75 states have internal predecessors, (87), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-09 06:45:18,901 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 87 transitions. [2024-11-09 06:45:18,901 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 87 transitions. Word has length 46 [2024-11-09 06:45:18,901 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 06:45:18,901 INFO L471 AbstractCegarLoop]: Abstraction has 76 states and 87 transitions. [2024-11-09 06:45:18,902 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 25 states have (on average 5.04) internal successors, (126), 25 states have internal predecessors, (126), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-09 06:45:18,902 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 87 transitions. [2024-11-09 06:45:18,903 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 49 [2024-11-09 06:45:18,903 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 06:45:18,903 INFO L215 NwaCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-09 06:45:18,924 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_627c9d95-6587-4b89-802d-015e259dbc56/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Ended with exit code 0 [2024-11-09 06:45:19,103 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_627c9d95-6587-4b89-802d-015e259dbc56/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 06:45:19,104 INFO L396 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 06:45:19,104 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 06:45:19,104 INFO L85 PathProgramCache]: Analyzing trace with hash -742764819, now seen corresponding path program 4 times [2024-11-09 06:45:19,105 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 06:45:19,105 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1216402112] [2024-11-09 06:45:19,105 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 06:45:19,105 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 06:45:19,125 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 06:45:19,251 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 6 proven. 7 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2024-11-09 06:45:19,251 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 06:45:19,251 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1216402112] [2024-11-09 06:45:19,251 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1216402112] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-09 06:45:19,251 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1882305713] [2024-11-09 06:45:19,251 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2024-11-09 06:45:19,251 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 06:45:19,252 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_627c9d95-6587-4b89-802d-015e259dbc56/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 06:45:19,253 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_627c9d95-6587-4b89-802d-015e259dbc56/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 06:45:19,255 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_627c9d95-6587-4b89-802d-015e259dbc56/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2024-11-09 06:45:19,326 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 06:45:19,327 INFO L255 TraceCheckSpWp]: Trace formula consists of 163 conjuncts, 8 conjuncts are in the unsatisfiable core [2024-11-09 06:45:19,329 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 06:45:19,403 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 9 proven. 4 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2024-11-09 06:45:19,405 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-09 06:45:19,461 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 9 proven. 4 refuted. 0 times theorem prover too weak. 20 trivial. 0 not checked. [2024-11-09 06:45:19,461 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1882305713] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-09 06:45:19,461 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1185766152] [2024-11-09 06:45:19,464 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2024-11-09 06:45:19,465 INFO L166 IcfgInterpreter]: Building call graph [2024-11-09 06:45:19,465 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-09 06:45:19,465 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-09 06:45:19,465 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-09 06:45:20,527 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-09 06:45:21,241 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1592#true' at error location [2024-11-09 06:45:21,242 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-09 06:45:21,242 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-09 06:45:21,242 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 14 [2024-11-09 06:45:21,242 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [834266071] [2024-11-09 06:45:21,242 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-09 06:45:21,243 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2024-11-09 06:45:21,243 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 06:45:21,243 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2024-11-09 06:45:21,244 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=135, Invalid=677, Unknown=0, NotChecked=0, Total=812 [2024-11-09 06:45:21,244 INFO L87 Difference]: Start difference. First operand 76 states and 87 transitions. Second operand has 14 states, 14 states have (on average 3.5714285714285716) internal successors, (50), 14 states have internal predecessors, (50), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-09 06:45:21,526 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 06:45:21,526 INFO L93 Difference]: Finished difference Result 168 states and 194 transitions. [2024-11-09 06:45:21,527 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2024-11-09 06:45:21,527 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 3.5714285714285716) internal successors, (50), 14 states have internal predecessors, (50), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 48 [2024-11-09 06:45:21,527 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 06:45:21,528 INFO L225 Difference]: With dead ends: 168 [2024-11-09 06:45:21,528 INFO L226 Difference]: Without dead ends: 96 [2024-11-09 06:45:21,529 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 153 GetRequests, 115 SyntacticMatches, 9 SemanticMatches, 29 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 322 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=156, Invalid=774, Unknown=0, NotChecked=0, Total=930 [2024-11-09 06:45:21,529 INFO L432 NwaCegarLoop]: 10 mSDtfsCounter, 75 mSDsluCounter, 24 mSDsCounter, 0 mSdLazyCounter, 234 mSolverCounterSat, 102 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 75 SdHoareTripleChecker+Valid, 34 SdHoareTripleChecker+Invalid, 336 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 102 IncrementalHoareTripleChecker+Valid, 234 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2024-11-09 06:45:21,530 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [75 Valid, 34 Invalid, 336 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [102 Valid, 234 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2024-11-09 06:45:21,534 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2024-11-09 06:45:21,548 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 83. [2024-11-09 06:45:21,550 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 83 states, 82 states have (on average 1.1341463414634145) internal successors, (93), 82 states have internal predecessors, (93), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-09 06:45:21,552 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 83 states to 83 states and 93 transitions. [2024-11-09 06:45:21,552 INFO L78 Accepts]: Start accepts. Automaton has 83 states and 93 transitions. Word has length 48 [2024-11-09 06:45:21,553 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 06:45:21,553 INFO L471 AbstractCegarLoop]: Abstraction has 83 states and 93 transitions. [2024-11-09 06:45:21,555 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 3.5714285714285716) internal successors, (50), 14 states have internal predecessors, (50), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-09 06:45:21,556 INFO L276 IsEmpty]: Start isEmpty. Operand 83 states and 93 transitions. [2024-11-09 06:45:21,557 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 51 [2024-11-09 06:45:21,557 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 06:45:21,557 INFO L215 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-09 06:45:21,581 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_627c9d95-6587-4b89-802d-015e259dbc56/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2024-11-09 06:45:21,757 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_627c9d95-6587-4b89-802d-015e259dbc56/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 06:45:21,758 INFO L396 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 06:45:21,758 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 06:45:21,758 INFO L85 PathProgramCache]: Analyzing trace with hash -1880831278, now seen corresponding path program 5 times [2024-11-09 06:45:21,758 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 06:45:21,758 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [115187097] [2024-11-09 06:45:21,758 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 06:45:21,758 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 06:45:21,780 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 06:45:21,906 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 1 proven. 12 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2024-11-09 06:45:21,907 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 06:45:21,907 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [115187097] [2024-11-09 06:45:21,907 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [115187097] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-09 06:45:21,907 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1686035640] [2024-11-09 06:45:21,907 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2024-11-09 06:45:21,908 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 06:45:21,908 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_627c9d95-6587-4b89-802d-015e259dbc56/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 06:45:21,909 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_627c9d95-6587-4b89-802d-015e259dbc56/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 06:45:21,911 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_627c9d95-6587-4b89-802d-015e259dbc56/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2024-11-09 06:45:21,992 INFO L227 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2024-11-09 06:45:21,992 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-09 06:45:21,993 INFO L255 TraceCheckSpWp]: Trace formula consists of 171 conjuncts, 8 conjuncts are in the unsatisfiable core [2024-11-09 06:45:21,995 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 06:45:22,112 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 6 proven. 7 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2024-11-09 06:45:22,113 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-09 06:45:22,224 INFO L134 CoverageAnalysis]: Checked inductivity of 38 backedges. 6 proven. 7 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2024-11-09 06:45:22,224 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1686035640] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-09 06:45:22,225 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1634624349] [2024-11-09 06:45:22,228 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2024-11-09 06:45:22,228 INFO L166 IcfgInterpreter]: Building call graph [2024-11-09 06:45:22,228 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-09 06:45:22,229 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-09 06:45:22,229 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-09 06:45:23,235 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-09 06:45:23,881 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2271#true' at error location [2024-11-09 06:45:23,881 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-09 06:45:23,881 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-09 06:45:23,881 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 14 [2024-11-09 06:45:23,881 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [971340534] [2024-11-09 06:45:23,881 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-09 06:45:23,882 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2024-11-09 06:45:23,882 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 06:45:23,882 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2024-11-09 06:45:23,883 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=137, Invalid=619, Unknown=0, NotChecked=0, Total=756 [2024-11-09 06:45:23,883 INFO L87 Difference]: Start difference. First operand 83 states and 93 transitions. Second operand has 14 states, 14 states have (on average 4.785714285714286) internal successors, (67), 14 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-09 06:45:24,173 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 06:45:24,174 INFO L93 Difference]: Finished difference Result 95 states and 105 transitions. [2024-11-09 06:45:24,174 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2024-11-09 06:45:24,174 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 4.785714285714286) internal successors, (67), 14 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 50 [2024-11-09 06:45:24,175 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 06:45:24,175 INFO L225 Difference]: With dead ends: 95 [2024-11-09 06:45:24,175 INFO L226 Difference]: Without dead ends: 67 [2024-11-09 06:45:24,176 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 163 GetRequests, 121 SyntacticMatches, 10 SemanticMatches, 32 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 384 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=216, Invalid=906, Unknown=0, NotChecked=0, Total=1122 [2024-11-09 06:45:24,177 INFO L432 NwaCegarLoop]: 10 mSDtfsCounter, 88 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 261 mSolverCounterSat, 96 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 88 SdHoareTripleChecker+Valid, 22 SdHoareTripleChecker+Invalid, 357 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 96 IncrementalHoareTripleChecker+Valid, 261 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2024-11-09 06:45:24,177 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [88 Valid, 22 Invalid, 357 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [96 Valid, 261 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2024-11-09 06:45:24,178 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2024-11-09 06:45:24,183 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 61. [2024-11-09 06:45:24,184 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 61 states, 60 states have (on average 1.1166666666666667) internal successors, (67), 60 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-09 06:45:24,184 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 67 transitions. [2024-11-09 06:45:24,184 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 67 transitions. Word has length 50 [2024-11-09 06:45:24,185 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 06:45:24,185 INFO L471 AbstractCegarLoop]: Abstraction has 61 states and 67 transitions. [2024-11-09 06:45:24,185 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 4.785714285714286) internal successors, (67), 14 states have internal predecessors, (67), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-09 06:45:24,185 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 67 transitions. [2024-11-09 06:45:24,186 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 61 [2024-11-09 06:45:24,186 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 06:45:24,186 INFO L215 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-09 06:45:24,207 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_627c9d95-6587-4b89-802d-015e259dbc56/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Ended with exit code 0 [2024-11-09 06:45:24,387 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_627c9d95-6587-4b89-802d-015e259dbc56/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2024-11-09 06:45:24,388 INFO L396 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 06:45:24,388 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 06:45:24,388 INFO L85 PathProgramCache]: Analyzing trace with hash -1180543221, now seen corresponding path program 6 times [2024-11-09 06:45:24,388 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 06:45:24,389 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [552226270] [2024-11-09 06:45:24,389 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 06:45:24,389 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 06:45:24,451 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 06:45:29,225 INFO L134 CoverageAnalysis]: Checked inductivity of 63 backedges. 0 proven. 63 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 06:45:29,225 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 06:45:29,225 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [552226270] [2024-11-09 06:45:29,225 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [552226270] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-09 06:45:29,225 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1793793014] [2024-11-09 06:45:29,226 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2024-11-09 06:45:29,226 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 06:45:29,226 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_627c9d95-6587-4b89-802d-015e259dbc56/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 06:45:29,228 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_627c9d95-6587-4b89-802d-015e259dbc56/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 06:45:29,230 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_627c9d95-6587-4b89-802d-015e259dbc56/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2024-11-09 06:45:29,305 INFO L227 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2024-11-09 06:45:29,305 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-09 06:45:29,308 INFO L255 TraceCheckSpWp]: Trace formula consists of 201 conjuncts, 79 conjuncts are in the unsatisfiable core [2024-11-09 06:45:29,315 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 06:45:29,923 INFO L134 CoverageAnalysis]: Checked inductivity of 63 backedges. 0 proven. 54 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2024-11-09 06:45:29,923 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-09 06:45:30,551 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2024-11-09 06:45:30,552 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 6 select indices, 6 select index equivalence classes, 0 disjoint index pairs (out of 15 index pairs), introduced 6 new quantified variables, introduced 15 case distinctions, treesize of input 52 treesize of output 89 [2024-11-09 06:45:30,823 INFO L134 CoverageAnalysis]: Checked inductivity of 63 backedges. 0 proven. 54 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2024-11-09 06:45:30,823 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1793793014] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-09 06:45:30,823 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1501207543] [2024-11-09 06:45:30,825 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2024-11-09 06:45:30,825 INFO L166 IcfgInterpreter]: Building call graph [2024-11-09 06:45:30,826 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-09 06:45:30,826 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-09 06:45:30,826 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-09 06:45:31,929 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-09 06:45:33,453 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2829#true' at error location [2024-11-09 06:45:33,453 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-09 06:45:33,453 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-09 06:45:33,453 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [33, 12, 12] total 49 [2024-11-09 06:45:33,454 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1521522396] [2024-11-09 06:45:33,454 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-09 06:45:33,454 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 49 states [2024-11-09 06:45:33,454 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 06:45:33,455 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 49 interpolants. [2024-11-09 06:45:33,457 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=290, Invalid=3742, Unknown=0, NotChecked=0, Total=4032 [2024-11-09 06:45:33,457 INFO L87 Difference]: Start difference. First operand 61 states and 67 transitions. Second operand has 49 states, 49 states have (on average 3.3469387755102042) internal successors, (164), 49 states have internal predecessors, (164), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-09 06:45:38,423 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 06:45:38,423 INFO L93 Difference]: Finished difference Result 198 states and 225 transitions. [2024-11-09 06:45:38,424 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 45 states. [2024-11-09 06:45:38,424 INFO L78 Accepts]: Start accepts. Automaton has has 49 states, 49 states have (on average 3.3469387755102042) internal successors, (164), 49 states have internal predecessors, (164), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 60 [2024-11-09 06:45:38,424 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 06:45:38,425 INFO L225 Difference]: With dead ends: 198 [2024-11-09 06:45:38,425 INFO L226 Difference]: Without dead ends: 192 [2024-11-09 06:45:38,428 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 256 GetRequests, 147 SyntacticMatches, 5 SemanticMatches, 104 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2499 ImplicationChecksByTransitivity, 5.9s TimeCoverageRelationStatistics Valid=1145, Invalid=9985, Unknown=0, NotChecked=0, Total=11130 [2024-11-09 06:45:38,429 INFO L432 NwaCegarLoop]: 16 mSDtfsCounter, 482 mSDsluCounter, 163 mSDsCounter, 0 mSdLazyCounter, 3089 mSolverCounterSat, 536 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 482 SdHoareTripleChecker+Valid, 179 SdHoareTripleChecker+Invalid, 3625 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 536 IncrementalHoareTripleChecker+Valid, 3089 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.1s IncrementalHoareTripleChecker+Time [2024-11-09 06:45:38,429 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [482 Valid, 179 Invalid, 3625 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [536 Valid, 3089 Invalid, 0 Unknown, 0 Unchecked, 2.1s Time] [2024-11-09 06:45:38,430 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 192 states. [2024-11-09 06:45:38,447 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 192 to 118. [2024-11-09 06:45:38,448 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 118 states, 117 states have (on average 1.1367521367521367) internal successors, (133), 117 states have internal predecessors, (133), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-09 06:45:38,448 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 118 states to 118 states and 133 transitions. [2024-11-09 06:45:38,449 INFO L78 Accepts]: Start accepts. Automaton has 118 states and 133 transitions. Word has length 60 [2024-11-09 06:45:38,449 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 06:45:38,449 INFO L471 AbstractCegarLoop]: Abstraction has 118 states and 133 transitions. [2024-11-09 06:45:38,450 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 49 states, 49 states have (on average 3.3469387755102042) internal successors, (164), 49 states have internal predecessors, (164), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-09 06:45:38,450 INFO L276 IsEmpty]: Start isEmpty. Operand 118 states and 133 transitions. [2024-11-09 06:45:38,451 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 63 [2024-11-09 06:45:38,451 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 06:45:38,451 INFO L215 NwaCegarLoop]: trace histogram [4, 4, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-09 06:45:38,467 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_627c9d95-6587-4b89-802d-015e259dbc56/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2024-11-09 06:45:38,655 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_627c9d95-6587-4b89-802d-015e259dbc56/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable7 [2024-11-09 06:45:38,655 INFO L396 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 06:45:38,656 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 06:45:38,656 INFO L85 PathProgramCache]: Analyzing trace with hash 1382240304, now seen corresponding path program 7 times [2024-11-09 06:45:38,656 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 06:45:38,656 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [457909220] [2024-11-09 06:45:38,656 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 06:45:38,656 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 06:45:38,672 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 06:45:38,836 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 11 proven. 14 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2024-11-09 06:45:38,836 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 06:45:38,836 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [457909220] [2024-11-09 06:45:38,836 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [457909220] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-09 06:45:38,837 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1373030016] [2024-11-09 06:45:38,837 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2024-11-09 06:45:38,837 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 06:45:38,837 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_627c9d95-6587-4b89-802d-015e259dbc56/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 06:45:38,839 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_627c9d95-6587-4b89-802d-015e259dbc56/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 06:45:38,840 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_627c9d95-6587-4b89-802d-015e259dbc56/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2024-11-09 06:45:38,918 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 06:45:38,921 INFO L255 TraceCheckSpWp]: Trace formula consists of 207 conjuncts, 10 conjuncts are in the unsatisfiable core [2024-11-09 06:45:38,923 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 06:45:39,021 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 16 proven. 9 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2024-11-09 06:45:39,022 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-09 06:45:39,103 INFO L134 CoverageAnalysis]: Checked inductivity of 70 backedges. 16 proven. 9 refuted. 0 times theorem prover too weak. 45 trivial. 0 not checked. [2024-11-09 06:45:39,103 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1373030016] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-09 06:45:39,104 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [399372110] [2024-11-09 06:45:39,106 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2024-11-09 06:45:39,106 INFO L166 IcfgInterpreter]: Building call graph [2024-11-09 06:45:39,106 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-09 06:45:39,106 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-09 06:45:39,106 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-09 06:45:40,378 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-09 06:45:41,089 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3790#true' at error location [2024-11-09 06:45:41,089 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-09 06:45:41,089 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-09 06:45:41,089 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 17 [2024-11-09 06:45:41,090 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1998114998] [2024-11-09 06:45:41,090 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-09 06:45:41,090 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2024-11-09 06:45:41,090 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 06:45:41,091 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2024-11-09 06:45:41,091 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=158, Invalid=834, Unknown=0, NotChecked=0, Total=992 [2024-11-09 06:45:41,091 INFO L87 Difference]: Start difference. First operand 118 states and 133 transitions. Second operand has 17 states, 17 states have (on average 3.2941176470588234) internal successors, (56), 17 states have internal predecessors, (56), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-09 06:45:41,407 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 06:45:41,407 INFO L93 Difference]: Finished difference Result 227 states and 256 transitions. [2024-11-09 06:45:41,407 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2024-11-09 06:45:41,408 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 3.2941176470588234) internal successors, (56), 17 states have internal predecessors, (56), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 62 [2024-11-09 06:45:41,408 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 06:45:41,408 INFO L225 Difference]: With dead ends: 227 [2024-11-09 06:45:41,409 INFO L226 Difference]: Without dead ends: 86 [2024-11-09 06:45:41,409 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 198 GetRequests, 154 SyntacticMatches, 11 SemanticMatches, 33 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 439 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=194, Invalid=996, Unknown=0, NotChecked=0, Total=1190 [2024-11-09 06:45:41,410 INFO L432 NwaCegarLoop]: 10 mSDtfsCounter, 122 mSDsluCounter, 18 mSDsCounter, 0 mSdLazyCounter, 268 mSolverCounterSat, 156 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 122 SdHoareTripleChecker+Valid, 28 SdHoareTripleChecker+Invalid, 424 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 156 IncrementalHoareTripleChecker+Valid, 268 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2024-11-09 06:45:41,411 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [122 Valid, 28 Invalid, 424 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [156 Valid, 268 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2024-11-09 06:45:41,411 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 86 states. [2024-11-09 06:45:41,421 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 86 to 73. [2024-11-09 06:45:41,422 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 73 states, 72 states have (on average 1.0972222222222223) internal successors, (79), 72 states have internal predecessors, (79), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-09 06:45:41,422 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 73 states to 73 states and 79 transitions. [2024-11-09 06:45:41,424 INFO L78 Accepts]: Start accepts. Automaton has 73 states and 79 transitions. Word has length 62 [2024-11-09 06:45:41,424 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 06:45:41,425 INFO L471 AbstractCegarLoop]: Abstraction has 73 states and 79 transitions. [2024-11-09 06:45:41,425 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 17 states have (on average 3.2941176470588234) internal successors, (56), 17 states have internal predecessors, (56), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-09 06:45:41,425 INFO L276 IsEmpty]: Start isEmpty. Operand 73 states and 79 transitions. [2024-11-09 06:45:41,426 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 73 [2024-11-09 06:45:41,426 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 06:45:41,426 INFO L215 NwaCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-09 06:45:41,450 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_627c9d95-6587-4b89-802d-015e259dbc56/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Ended with exit code 0 [2024-11-09 06:45:41,630 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_627c9d95-6587-4b89-802d-015e259dbc56/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 06:45:41,631 INFO L396 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 06:45:41,631 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 06:45:41,631 INFO L85 PathProgramCache]: Analyzing trace with hash -2017349047, now seen corresponding path program 8 times [2024-11-09 06:45:41,631 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 06:45:41,631 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1537535298] [2024-11-09 06:45:41,631 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 06:45:41,631 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 06:45:41,648 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 06:45:41,819 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 4 proven. 21 refuted. 0 times theorem prover too weak. 80 trivial. 0 not checked. [2024-11-09 06:45:41,819 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 06:45:41,819 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1537535298] [2024-11-09 06:45:41,819 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1537535298] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-09 06:45:41,820 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [630621631] [2024-11-09 06:45:41,820 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2024-11-09 06:45:41,820 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 06:45:41,820 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_627c9d95-6587-4b89-802d-015e259dbc56/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 06:45:41,822 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_627c9d95-6587-4b89-802d-015e259dbc56/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 06:45:41,823 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_627c9d95-6587-4b89-802d-015e259dbc56/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2024-11-09 06:45:41,924 INFO L227 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 5 check-sat command(s) [2024-11-09 06:45:41,924 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-09 06:45:41,926 INFO L255 TraceCheckSpWp]: Trace formula consists of 239 conjuncts, 10 conjuncts are in the unsatisfiable core [2024-11-09 06:45:41,931 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 06:45:42,075 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 12 proven. 13 refuted. 0 times theorem prover too weak. 80 trivial. 0 not checked. [2024-11-09 06:45:42,075 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-09 06:45:42,188 INFO L134 CoverageAnalysis]: Checked inductivity of 105 backedges. 12 proven. 13 refuted. 0 times theorem prover too weak. 80 trivial. 0 not checked. [2024-11-09 06:45:42,188 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [630621631] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-09 06:45:42,189 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [210179244] [2024-11-09 06:45:42,190 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2024-11-09 06:45:42,192 INFO L166 IcfgInterpreter]: Building call graph [2024-11-09 06:45:42,192 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-09 06:45:42,193 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-09 06:45:42,193 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-09 06:45:43,209 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-09 06:45:43,861 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4631#true' at error location [2024-11-09 06:45:43,861 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-09 06:45:43,861 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-09 06:45:43,861 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 11, 11] total 17 [2024-11-09 06:45:43,861 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1612562633] [2024-11-09 06:45:43,861 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-09 06:45:43,862 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2024-11-09 06:45:43,862 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 06:45:43,862 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2024-11-09 06:45:43,862 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=160, Invalid=770, Unknown=0, NotChecked=0, Total=930 [2024-11-09 06:45:43,863 INFO L87 Difference]: Start difference. First operand 73 states and 79 transitions. Second operand has 17 states, 17 states have (on average 4.352941176470588) internal successors, (74), 17 states have internal predecessors, (74), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-09 06:45:44,252 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 06:45:44,252 INFO L93 Difference]: Finished difference Result 85 states and 91 transitions. [2024-11-09 06:45:44,252 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2024-11-09 06:45:44,252 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 4.352941176470588) internal successors, (74), 17 states have internal predecessors, (74), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 72 [2024-11-09 06:45:44,253 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 06:45:44,253 INFO L225 Difference]: With dead ends: 85 [2024-11-09 06:45:44,253 INFO L226 Difference]: Without dead ends: 81 [2024-11-09 06:45:44,254 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 238 GetRequests, 189 SyntacticMatches, 12 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 540 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=277, Invalid=1205, Unknown=0, NotChecked=0, Total=1482 [2024-11-09 06:45:44,255 INFO L432 NwaCegarLoop]: 10 mSDtfsCounter, 93 mSDsluCounter, 18 mSDsCounter, 0 mSdLazyCounter, 410 mSolverCounterSat, 99 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 93 SdHoareTripleChecker+Valid, 28 SdHoareTripleChecker+Invalid, 509 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 99 IncrementalHoareTripleChecker+Valid, 410 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2024-11-09 06:45:44,255 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [93 Valid, 28 Invalid, 509 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [99 Valid, 410 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2024-11-09 06:45:44,256 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2024-11-09 06:45:44,270 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 75. [2024-11-09 06:45:44,271 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 75 states, 74 states have (on average 1.0945945945945945) internal successors, (81), 74 states have internal predecessors, (81), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-09 06:45:44,271 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 81 transitions. [2024-11-09 06:45:44,272 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 81 transitions. Word has length 72 [2024-11-09 06:45:44,272 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 06:45:44,272 INFO L471 AbstractCegarLoop]: Abstraction has 75 states and 81 transitions. [2024-11-09 06:45:44,272 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 17 states have (on average 4.352941176470588) internal successors, (74), 17 states have internal predecessors, (74), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-09 06:45:44,272 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 81 transitions. [2024-11-09 06:45:44,273 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 75 [2024-11-09 06:45:44,273 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 06:45:44,273 INFO L215 NwaCegarLoop]: trace histogram [4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-09 06:45:44,292 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_627c9d95-6587-4b89-802d-015e259dbc56/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2024-11-09 06:45:44,474 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_627c9d95-6587-4b89-802d-015e259dbc56/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2024-11-09 06:45:44,474 INFO L396 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 06:45:44,474 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 06:45:44,474 INFO L85 PathProgramCache]: Analyzing trace with hash -1846432402, now seen corresponding path program 9 times [2024-11-09 06:45:44,474 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 06:45:44,474 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1774109173] [2024-11-09 06:45:44,475 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 06:45:44,475 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 06:45:44,539 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 06:45:50,036 INFO L134 CoverageAnalysis]: Checked inductivity of 112 backedges. 0 proven. 112 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 06:45:50,036 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 06:45:50,036 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1774109173] [2024-11-09 06:45:50,036 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1774109173] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-09 06:45:50,036 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [694984278] [2024-11-09 06:45:50,036 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2024-11-09 06:45:50,037 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 06:45:50,037 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_627c9d95-6587-4b89-802d-015e259dbc56/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 06:45:50,038 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_627c9d95-6587-4b89-802d-015e259dbc56/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 06:45:50,039 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_627c9d95-6587-4b89-802d-015e259dbc56/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2024-11-09 06:45:50,131 INFO L227 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2024-11-09 06:45:50,132 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-09 06:45:50,135 INFO L255 TraceCheckSpWp]: Trace formula consists of 245 conjuncts, 105 conjuncts are in the unsatisfiable core [2024-11-09 06:45:50,139 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 06:45:50,993 INFO L134 CoverageAnalysis]: Checked inductivity of 112 backedges. 0 proven. 96 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2024-11-09 06:45:50,993 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-09 06:45:51,965 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2024-11-09 06:45:51,965 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 8 select indices, 8 select index equivalence classes, 0 disjoint index pairs (out of 28 index pairs), introduced 8 new quantified variables, introduced 28 case distinctions, treesize of input 69 treesize of output 153 [2024-11-09 06:45:52,506 INFO L134 CoverageAnalysis]: Checked inductivity of 112 backedges. 0 proven. 96 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2024-11-09 06:45:52,507 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [694984278] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-09 06:45:52,507 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1334766713] [2024-11-09 06:45:52,508 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2024-11-09 06:45:52,509 INFO L166 IcfgInterpreter]: Building call graph [2024-11-09 06:45:52,509 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-09 06:45:52,509 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-09 06:45:52,510 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-09 06:45:53,396 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-09 06:45:55,151 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5339#true' at error location [2024-11-09 06:45:55,151 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-09 06:45:55,151 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-09 06:45:55,151 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [41, 14, 14] total 61 [2024-11-09 06:45:55,151 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [653388926] [2024-11-09 06:45:55,152 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-09 06:45:55,152 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 61 states [2024-11-09 06:45:55,152 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 06:45:55,153 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 61 interpolants. [2024-11-09 06:45:55,154 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=359, Invalid=5341, Unknown=0, NotChecked=0, Total=5700 [2024-11-09 06:45:55,155 INFO L87 Difference]: Start difference. First operand 75 states and 81 transitions. Second operand has 61 states, 61 states have (on average 3.3114754098360657) internal successors, (202), 61 states have internal predecessors, (202), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-09 06:46:01,403 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 06:46:01,403 INFO L93 Difference]: Finished difference Result 229 states and 251 transitions. [2024-11-09 06:46:01,403 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2024-11-09 06:46:01,403 INFO L78 Accepts]: Start accepts. Automaton has has 61 states, 61 states have (on average 3.3114754098360657) internal successors, (202), 61 states have internal predecessors, (202), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 74 [2024-11-09 06:46:01,404 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 06:46:01,405 INFO L225 Difference]: With dead ends: 229 [2024-11-09 06:46:01,405 INFO L226 Difference]: Without dead ends: 223 [2024-11-09 06:46:01,407 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 298 GetRequests, 184 SyntacticMatches, 5 SemanticMatches, 109 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2659 ImplicationChecksByTransitivity, 7.6s TimeCoverageRelationStatistics Valid=1175, Invalid=11035, Unknown=0, NotChecked=0, Total=12210 [2024-11-09 06:46:01,408 INFO L432 NwaCegarLoop]: 16 mSDtfsCounter, 693 mSDsluCounter, 164 mSDsCounter, 0 mSdLazyCounter, 3873 mSolverCounterSat, 655 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 2.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 693 SdHoareTripleChecker+Valid, 180 SdHoareTripleChecker+Invalid, 4528 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 655 IncrementalHoareTripleChecker+Valid, 3873 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 2.9s IncrementalHoareTripleChecker+Time [2024-11-09 06:46:01,409 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [693 Valid, 180 Invalid, 4528 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [655 Valid, 3873 Invalid, 0 Unknown, 0 Unchecked, 2.9s Time] [2024-11-09 06:46:01,409 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 223 states. [2024-11-09 06:46:01,436 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 223 to 142. [2024-11-09 06:46:01,437 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 142 states, 141 states have (on average 1.1063829787234043) internal successors, (156), 141 states have internal predecessors, (156), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-09 06:46:01,440 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 142 states to 142 states and 156 transitions. [2024-11-09 06:46:01,441 INFO L78 Accepts]: Start accepts. Automaton has 142 states and 156 transitions. Word has length 74 [2024-11-09 06:46:01,441 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 06:46:01,441 INFO L471 AbstractCegarLoop]: Abstraction has 142 states and 156 transitions. [2024-11-09 06:46:01,441 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 61 states, 61 states have (on average 3.3114754098360657) internal successors, (202), 61 states have internal predecessors, (202), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-09 06:46:01,442 INFO L276 IsEmpty]: Start isEmpty. Operand 142 states and 156 transitions. [2024-11-09 06:46:01,442 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 77 [2024-11-09 06:46:01,443 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 06:46:01,443 INFO L215 NwaCegarLoop]: trace histogram [5, 5, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-09 06:46:01,464 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_627c9d95-6587-4b89-802d-015e259dbc56/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2024-11-09 06:46:01,647 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_627c9d95-6587-4b89-802d-015e259dbc56/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable10 [2024-11-09 06:46:01,647 INFO L396 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 06:46:01,648 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 06:46:01,648 INFO L85 PathProgramCache]: Analyzing trace with hash 743147987, now seen corresponding path program 10 times [2024-11-09 06:46:01,648 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 06:46:01,648 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [254966302] [2024-11-09 06:46:01,648 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 06:46:01,648 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 06:46:01,668 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 06:46:01,844 INFO L134 CoverageAnalysis]: Checked inductivity of 121 backedges. 18 proven. 23 refuted. 0 times theorem prover too weak. 80 trivial. 0 not checked. [2024-11-09 06:46:01,844 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 06:46:01,844 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [254966302] [2024-11-09 06:46:01,844 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [254966302] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-09 06:46:01,844 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2021447005] [2024-11-09 06:46:01,844 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2024-11-09 06:46:01,845 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 06:46:01,845 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_627c9d95-6587-4b89-802d-015e259dbc56/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 06:46:01,846 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_627c9d95-6587-4b89-802d-015e259dbc56/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 06:46:01,847 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_627c9d95-6587-4b89-802d-015e259dbc56/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2024-11-09 06:46:01,927 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 06:46:01,928 INFO L255 TraceCheckSpWp]: Trace formula consists of 251 conjuncts, 12 conjuncts are in the unsatisfiable core [2024-11-09 06:46:01,930 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 06:46:02,075 INFO L134 CoverageAnalysis]: Checked inductivity of 121 backedges. 25 proven. 16 refuted. 0 times theorem prover too weak. 80 trivial. 0 not checked. [2024-11-09 06:46:02,076 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-09 06:46:02,167 INFO L134 CoverageAnalysis]: Checked inductivity of 121 backedges. 25 proven. 16 refuted. 0 times theorem prover too weak. 80 trivial. 0 not checked. [2024-11-09 06:46:02,167 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2021447005] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-09 06:46:02,167 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1764564871] [2024-11-09 06:46:02,168 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2024-11-09 06:46:02,168 INFO L166 IcfgInterpreter]: Building call graph [2024-11-09 06:46:02,169 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-09 06:46:02,169 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-09 06:46:02,169 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-09 06:46:03,132 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-09 06:46:03,932 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '6463#true' at error location [2024-11-09 06:46:03,932 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-09 06:46:03,933 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-09 06:46:03,933 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 20 [2024-11-09 06:46:03,933 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [219211219] [2024-11-09 06:46:03,933 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-09 06:46:03,933 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2024-11-09 06:46:03,933 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 06:46:03,934 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2024-11-09 06:46:03,934 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=185, Invalid=1005, Unknown=0, NotChecked=0, Total=1190 [2024-11-09 06:46:03,934 INFO L87 Difference]: Start difference. First operand 142 states and 156 transitions. Second operand has 20 states, 20 states have (on average 3.1) internal successors, (62), 20 states have internal predecessors, (62), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-09 06:46:04,320 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 06:46:04,321 INFO L93 Difference]: Finished difference Result 271 states and 299 transitions. [2024-11-09 06:46:04,321 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2024-11-09 06:46:04,321 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 3.1) internal successors, (62), 20 states have internal predecessors, (62), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 76 [2024-11-09 06:46:04,321 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 06:46:04,322 INFO L225 Difference]: With dead ends: 271 [2024-11-09 06:46:04,322 INFO L226 Difference]: Without dead ends: 100 [2024-11-09 06:46:04,323 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 243 GetRequests, 193 SyntacticMatches, 13 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 571 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=239, Invalid=1243, Unknown=0, NotChecked=0, Total=1482 [2024-11-09 06:46:04,324 INFO L432 NwaCegarLoop]: 10 mSDtfsCounter, 150 mSDsluCounter, 27 mSDsCounter, 0 mSdLazyCounter, 388 mSolverCounterSat, 174 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 150 SdHoareTripleChecker+Valid, 37 SdHoareTripleChecker+Invalid, 562 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 174 IncrementalHoareTripleChecker+Valid, 388 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2024-11-09 06:46:04,324 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [150 Valid, 37 Invalid, 562 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [174 Valid, 388 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2024-11-09 06:46:04,324 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 100 states. [2024-11-09 06:46:04,334 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 100 to 87. [2024-11-09 06:46:04,334 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 87 states, 86 states have (on average 1.0813953488372092) internal successors, (93), 86 states have internal predecessors, (93), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-09 06:46:04,335 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 87 states to 87 states and 93 transitions. [2024-11-09 06:46:04,335 INFO L78 Accepts]: Start accepts. Automaton has 87 states and 93 transitions. Word has length 76 [2024-11-09 06:46:04,335 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 06:46:04,335 INFO L471 AbstractCegarLoop]: Abstraction has 87 states and 93 transitions. [2024-11-09 06:46:04,335 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 20 states have (on average 3.1) internal successors, (62), 20 states have internal predecessors, (62), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-09 06:46:04,335 INFO L276 IsEmpty]: Start isEmpty. Operand 87 states and 93 transitions. [2024-11-09 06:46:04,336 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 87 [2024-11-09 06:46:04,336 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 06:46:04,336 INFO L215 NwaCegarLoop]: trace histogram [5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 4, 4, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-09 06:46:04,354 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_627c9d95-6587-4b89-802d-015e259dbc56/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2024-11-09 06:46:04,536 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_627c9d95-6587-4b89-802d-015e259dbc56/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2024-11-09 06:46:04,537 INFO L396 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 06:46:04,537 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 06:46:04,537 INFO L85 PathProgramCache]: Analyzing trace with hash -1006580692, now seen corresponding path program 11 times [2024-11-09 06:46:04,537 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 06:46:04,537 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1955683370] [2024-11-09 06:46:04,537 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 06:46:04,537 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 06:46:04,555 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 06:46:04,765 INFO L134 CoverageAnalysis]: Checked inductivity of 166 backedges. 9 proven. 32 refuted. 0 times theorem prover too weak. 125 trivial. 0 not checked. [2024-11-09 06:46:04,765 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 06:46:04,765 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1955683370] [2024-11-09 06:46:04,765 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1955683370] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-09 06:46:04,765 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1781436549] [2024-11-09 06:46:04,765 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2024-11-09 06:46:04,766 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 06:46:04,766 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_627c9d95-6587-4b89-802d-015e259dbc56/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 06:46:04,767 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_627c9d95-6587-4b89-802d-015e259dbc56/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 06:46:04,769 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_627c9d95-6587-4b89-802d-015e259dbc56/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2024-11-09 06:46:04,893 INFO L227 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 6 check-sat command(s) [2024-11-09 06:46:04,894 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-09 06:46:04,896 INFO L255 TraceCheckSpWp]: Trace formula consists of 283 conjuncts, 12 conjuncts are in the unsatisfiable core [2024-11-09 06:46:04,898 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 06:46:05,100 INFO L134 CoverageAnalysis]: Checked inductivity of 166 backedges. 20 proven. 21 refuted. 0 times theorem prover too weak. 125 trivial. 0 not checked. [2024-11-09 06:46:05,100 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-09 06:46:05,286 INFO L134 CoverageAnalysis]: Checked inductivity of 166 backedges. 20 proven. 21 refuted. 0 times theorem prover too weak. 125 trivial. 0 not checked. [2024-11-09 06:46:05,287 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1781436549] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-09 06:46:05,287 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [811676215] [2024-11-09 06:46:05,289 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2024-11-09 06:46:05,289 INFO L166 IcfgInterpreter]: Building call graph [2024-11-09 06:46:05,289 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-09 06:46:05,289 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-09 06:46:05,289 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-09 06:46:06,130 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-09 06:46:06,859 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '7480#true' at error location [2024-11-09 06:46:06,859 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-09 06:46:06,859 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-09 06:46:06,859 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 20 [2024-11-09 06:46:06,860 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1929471871] [2024-11-09 06:46:06,860 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-09 06:46:06,860 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 20 states [2024-11-09 06:46:06,860 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 06:46:06,861 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 20 interpolants. [2024-11-09 06:46:06,861 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=187, Invalid=935, Unknown=0, NotChecked=0, Total=1122 [2024-11-09 06:46:06,861 INFO L87 Difference]: Start difference. First operand 87 states and 93 transitions. Second operand has 20 states, 20 states have (on average 3.7) internal successors, (74), 20 states have internal predecessors, (74), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-09 06:46:07,314 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 06:46:07,314 INFO L93 Difference]: Finished difference Result 99 states and 105 transitions. [2024-11-09 06:46:07,314 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2024-11-09 06:46:07,315 INFO L78 Accepts]: Start accepts. Automaton has has 20 states, 20 states have (on average 3.7) internal successors, (74), 20 states have internal predecessors, (74), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 86 [2024-11-09 06:46:07,315 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 06:46:07,316 INFO L225 Difference]: With dead ends: 99 [2024-11-09 06:46:07,316 INFO L226 Difference]: Without dead ends: 95 [2024-11-09 06:46:07,317 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 281 GetRequests, 225 SyntacticMatches, 14 SemanticMatches, 42 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 717 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=348, Invalid=1544, Unknown=0, NotChecked=0, Total=1892 [2024-11-09 06:46:07,317 INFO L432 NwaCegarLoop]: 10 mSDtfsCounter, 133 mSDsluCounter, 15 mSDsCounter, 0 mSdLazyCounter, 441 mSolverCounterSat, 145 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 133 SdHoareTripleChecker+Valid, 25 SdHoareTripleChecker+Invalid, 586 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 145 IncrementalHoareTripleChecker+Valid, 441 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2024-11-09 06:46:07,318 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [133 Valid, 25 Invalid, 586 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [145 Valid, 441 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2024-11-09 06:46:07,318 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 95 states. [2024-11-09 06:46:07,329 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 95 to 89. [2024-11-09 06:46:07,330 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 89 states, 88 states have (on average 1.0795454545454546) internal successors, (95), 88 states have internal predecessors, (95), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-09 06:46:07,330 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 95 transitions. [2024-11-09 06:46:07,330 INFO L78 Accepts]: Start accepts. Automaton has 89 states and 95 transitions. Word has length 86 [2024-11-09 06:46:07,330 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 06:46:07,330 INFO L471 AbstractCegarLoop]: Abstraction has 89 states and 95 transitions. [2024-11-09 06:46:07,331 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 20 states, 20 states have (on average 3.7) internal successors, (74), 20 states have internal predecessors, (74), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-09 06:46:07,331 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 95 transitions. [2024-11-09 06:46:07,331 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 89 [2024-11-09 06:46:07,331 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 06:46:07,331 INFO L215 NwaCegarLoop]: trace histogram [5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-09 06:46:07,345 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_627c9d95-6587-4b89-802d-015e259dbc56/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2024-11-09 06:46:07,532 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_627c9d95-6587-4b89-802d-015e259dbc56/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2024-11-09 06:46:07,532 INFO L396 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 06:46:07,532 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 06:46:07,532 INFO L85 PathProgramCache]: Analyzing trace with hash -1160652143, now seen corresponding path program 12 times [2024-11-09 06:46:07,533 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 06:46:07,533 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [914100739] [2024-11-09 06:46:07,533 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 06:46:07,533 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 06:46:07,645 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 06:46:15,286 INFO L134 CoverageAnalysis]: Checked inductivity of 175 backedges. 2 proven. 173 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 06:46:15,286 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 06:46:15,286 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [914100739] [2024-11-09 06:46:15,287 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [914100739] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-09 06:46:15,287 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [488060019] [2024-11-09 06:46:15,287 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2024-11-09 06:46:15,287 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 06:46:15,287 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_627c9d95-6587-4b89-802d-015e259dbc56/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 06:46:15,288 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_627c9d95-6587-4b89-802d-015e259dbc56/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 06:46:15,289 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_627c9d95-6587-4b89-802d-015e259dbc56/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2024-11-09 06:46:15,388 INFO L227 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2024-11-09 06:46:15,388 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-09 06:46:15,391 INFO L255 TraceCheckSpWp]: Trace formula consists of 289 conjuncts, 127 conjuncts are in the unsatisfiable core [2024-11-09 06:46:15,394 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 06:46:16,530 INFO L134 CoverageAnalysis]: Checked inductivity of 175 backedges. 0 proven. 150 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2024-11-09 06:46:16,530 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-09 06:46:17,777 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2024-11-09 06:46:17,778 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 10 select indices, 10 select index equivalence classes, 0 disjoint index pairs (out of 45 index pairs), introduced 10 new quantified variables, introduced 45 case distinctions, treesize of input 86 treesize of output 235 [2024-11-09 06:46:19,755 INFO L134 CoverageAnalysis]: Checked inductivity of 175 backedges. 0 proven. 150 refuted. 0 times theorem prover too weak. 25 trivial. 0 not checked. [2024-11-09 06:46:19,755 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [488060019] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-09 06:46:19,755 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1258978837] [2024-11-09 06:46:19,757 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2024-11-09 06:46:19,757 INFO L166 IcfgInterpreter]: Building call graph [2024-11-09 06:46:19,757 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-09 06:46:19,757 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-09 06:46:19,758 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-09 06:46:20,673 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-09 06:46:22,510 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '8318#true' at error location [2024-11-09 06:46:22,510 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-09 06:46:22,510 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-09 06:46:22,511 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [47, 16, 16] total 71 [2024-11-09 06:46:22,511 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [425339982] [2024-11-09 06:46:22,511 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-09 06:46:22,512 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 71 states [2024-11-09 06:46:22,512 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 06:46:22,513 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 71 interpolants. [2024-11-09 06:46:22,515 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=462, Invalid=6848, Unknown=0, NotChecked=0, Total=7310 [2024-11-09 06:46:22,516 INFO L87 Difference]: Start difference. First operand 89 states and 95 transitions. Second operand has 71 states, 71 states have (on average 3.380281690140845) internal successors, (240), 71 states have internal predecessors, (240), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-09 06:46:32,531 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 06:46:32,531 INFO L93 Difference]: Finished difference Result 362 states and 393 transitions. [2024-11-09 06:46:32,531 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 83 states. [2024-11-09 06:46:32,532 INFO L78 Accepts]: Start accepts. Automaton has has 71 states, 71 states have (on average 3.380281690140845) internal successors, (240), 71 states have internal predecessors, (240), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 88 [2024-11-09 06:46:32,532 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 06:46:32,533 INFO L225 Difference]: With dead ends: 362 [2024-11-09 06:46:32,533 INFO L226 Difference]: Without dead ends: 331 [2024-11-09 06:46:32,537 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 378 GetRequests, 223 SyntacticMatches, 5 SemanticMatches, 150 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 6568 ImplicationChecksByTransitivity, 11.0s TimeCoverageRelationStatistics Valid=1679, Invalid=21273, Unknown=0, NotChecked=0, Total=22952 [2024-11-09 06:46:32,538 INFO L432 NwaCegarLoop]: 17 mSDtfsCounter, 593 mSDsluCounter, 197 mSDsCounter, 0 mSdLazyCounter, 4826 mSolverCounterSat, 675 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 3.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 593 SdHoareTripleChecker+Valid, 214 SdHoareTripleChecker+Invalid, 5501 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 675 IncrementalHoareTripleChecker+Valid, 4826 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 3.9s IncrementalHoareTripleChecker+Time [2024-11-09 06:46:32,538 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [593 Valid, 214 Invalid, 5501 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [675 Valid, 4826 Invalid, 0 Unknown, 0 Unchecked, 3.9s Time] [2024-11-09 06:46:32,539 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 331 states. [2024-11-09 06:46:32,577 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 331 to 173. [2024-11-09 06:46:32,577 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 173 states, 172 states have (on average 1.0930232558139534) internal successors, (188), 172 states have internal predecessors, (188), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-09 06:46:32,578 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 173 states to 173 states and 188 transitions. [2024-11-09 06:46:32,578 INFO L78 Accepts]: Start accepts. Automaton has 173 states and 188 transitions. Word has length 88 [2024-11-09 06:46:32,578 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 06:46:32,578 INFO L471 AbstractCegarLoop]: Abstraction has 173 states and 188 transitions. [2024-11-09 06:46:32,579 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 71 states, 71 states have (on average 3.380281690140845) internal successors, (240), 71 states have internal predecessors, (240), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-09 06:46:32,579 INFO L276 IsEmpty]: Start isEmpty. Operand 173 states and 188 transitions. [2024-11-09 06:46:32,579 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 91 [2024-11-09 06:46:32,580 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 06:46:32,580 INFO L215 NwaCegarLoop]: trace histogram [6, 6, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-09 06:46:32,602 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_627c9d95-6587-4b89-802d-015e259dbc56/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Ended with exit code 0 [2024-11-09 06:46:32,780 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_627c9d95-6587-4b89-802d-015e259dbc56/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2024-11-09 06:46:32,780 INFO L396 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 06:46:32,781 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 06:46:32,781 INFO L85 PathProgramCache]: Analyzing trace with hash -109712842, now seen corresponding path program 13 times [2024-11-09 06:46:32,781 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 06:46:32,781 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1022850915] [2024-11-09 06:46:32,781 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 06:46:32,781 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 06:46:32,803 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 06:46:33,063 INFO L134 CoverageAnalysis]: Checked inductivity of 186 backedges. 27 proven. 34 refuted. 0 times theorem prover too weak. 125 trivial. 0 not checked. [2024-11-09 06:46:33,063 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 06:46:33,063 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1022850915] [2024-11-09 06:46:33,063 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1022850915] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-09 06:46:33,063 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [859915560] [2024-11-09 06:46:33,063 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2024-11-09 06:46:33,063 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 06:46:33,064 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_627c9d95-6587-4b89-802d-015e259dbc56/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 06:46:33,066 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_627c9d95-6587-4b89-802d-015e259dbc56/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 06:46:33,067 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_627c9d95-6587-4b89-802d-015e259dbc56/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2024-11-09 06:46:33,176 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 06:46:33,178 INFO L255 TraceCheckSpWp]: Trace formula consists of 295 conjuncts, 14 conjuncts are in the unsatisfiable core [2024-11-09 06:46:33,179 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 06:46:33,357 INFO L134 CoverageAnalysis]: Checked inductivity of 186 backedges. 36 proven. 25 refuted. 0 times theorem prover too weak. 125 trivial. 0 not checked. [2024-11-09 06:46:33,357 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-09 06:46:33,503 INFO L134 CoverageAnalysis]: Checked inductivity of 186 backedges. 36 proven. 25 refuted. 0 times theorem prover too weak. 125 trivial. 0 not checked. [2024-11-09 06:46:33,504 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [859915560] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-09 06:46:33,504 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2080808163] [2024-11-09 06:46:33,506 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2024-11-09 06:46:33,506 INFO L166 IcfgInterpreter]: Building call graph [2024-11-09 06:46:33,506 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-09 06:46:33,506 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-09 06:46:33,506 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-09 06:46:34,721 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-09 06:46:35,716 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '9840#true' at error location [2024-11-09 06:46:35,716 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-09 06:46:35,716 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-09 06:46:35,716 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 23 [2024-11-09 06:46:35,717 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [641892891] [2024-11-09 06:46:35,717 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-09 06:46:35,717 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2024-11-09 06:46:35,717 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 06:46:35,718 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2024-11-09 06:46:35,718 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=216, Invalid=1190, Unknown=0, NotChecked=0, Total=1406 [2024-11-09 06:46:35,719 INFO L87 Difference]: Start difference. First operand 173 states and 188 transitions. Second operand has 23 states, 23 states have (on average 2.9565217391304346) internal successors, (68), 23 states have internal predecessors, (68), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-09 06:46:36,329 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 06:46:36,330 INFO L93 Difference]: Finished difference Result 322 states and 350 transitions. [2024-11-09 06:46:36,330 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2024-11-09 06:46:36,330 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 2.9565217391304346) internal successors, (68), 23 states have internal predecessors, (68), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 90 [2024-11-09 06:46:36,330 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 06:46:36,331 INFO L225 Difference]: With dead ends: 322 [2024-11-09 06:46:36,331 INFO L226 Difference]: Without dead ends: 114 [2024-11-09 06:46:36,332 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 288 GetRequests, 232 SyntacticMatches, 15 SemanticMatches, 41 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 718 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=291, Invalid=1515, Unknown=0, NotChecked=0, Total=1806 [2024-11-09 06:46:36,332 INFO L432 NwaCegarLoop]: 10 mSDtfsCounter, 244 mSDsluCounter, 36 mSDsCounter, 0 mSdLazyCounter, 544 mSolverCounterSat, 218 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 244 SdHoareTripleChecker+Valid, 46 SdHoareTripleChecker+Invalid, 762 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 218 IncrementalHoareTripleChecker+Valid, 544 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2024-11-09 06:46:36,332 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [244 Valid, 46 Invalid, 762 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [218 Valid, 544 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2024-11-09 06:46:36,333 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 114 states. [2024-11-09 06:46:36,351 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 114 to 101. [2024-11-09 06:46:36,351 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 101 states, 100 states have (on average 1.07) internal successors, (107), 100 states have internal predecessors, (107), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-09 06:46:36,352 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 101 states to 101 states and 107 transitions. [2024-11-09 06:46:36,352 INFO L78 Accepts]: Start accepts. Automaton has 101 states and 107 transitions. Word has length 90 [2024-11-09 06:46:36,352 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 06:46:36,352 INFO L471 AbstractCegarLoop]: Abstraction has 101 states and 107 transitions. [2024-11-09 06:46:36,352 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 23 states have (on average 2.9565217391304346) internal successors, (68), 23 states have internal predecessors, (68), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-09 06:46:36,352 INFO L276 IsEmpty]: Start isEmpty. Operand 101 states and 107 transitions. [2024-11-09 06:46:36,353 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 101 [2024-11-09 06:46:36,353 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 06:46:36,353 INFO L215 NwaCegarLoop]: trace histogram [6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 5, 5, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-09 06:46:36,374 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_627c9d95-6587-4b89-802d-015e259dbc56/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Forceful destruction successful, exit code 0 [2024-11-09 06:46:36,553 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_627c9d95-6587-4b89-802d-015e259dbc56/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2024-11-09 06:46:36,554 INFO L396 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 06:46:36,554 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 06:46:36,554 INFO L85 PathProgramCache]: Analyzing trace with hash -395535153, now seen corresponding path program 14 times [2024-11-09 06:46:36,554 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 06:46:36,554 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [342391587] [2024-11-09 06:46:36,554 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 06:46:36,554 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 06:46:36,576 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 06:46:36,883 INFO L134 CoverageAnalysis]: Checked inductivity of 241 backedges. 16 proven. 45 refuted. 0 times theorem prover too weak. 180 trivial. 0 not checked. [2024-11-09 06:46:36,883 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 06:46:36,883 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [342391587] [2024-11-09 06:46:36,884 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [342391587] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-09 06:46:36,884 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1917988267] [2024-11-09 06:46:36,884 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2024-11-09 06:46:36,884 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 06:46:36,884 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_627c9d95-6587-4b89-802d-015e259dbc56/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 06:46:36,886 INFO L229 MonitoredProcess]: Starting monitored process 15 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_627c9d95-6587-4b89-802d-015e259dbc56/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 06:46:36,888 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_627c9d95-6587-4b89-802d-015e259dbc56/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Waiting until timeout for monitored process [2024-11-09 06:46:37,067 INFO L227 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 7 check-sat command(s) [2024-11-09 06:46:37,067 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-09 06:46:37,070 INFO L255 TraceCheckSpWp]: Trace formula consists of 327 conjuncts, 14 conjuncts are in the unsatisfiable core [2024-11-09 06:46:37,072 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 06:46:37,315 INFO L134 CoverageAnalysis]: Checked inductivity of 241 backedges. 30 proven. 31 refuted. 0 times theorem prover too weak. 180 trivial. 0 not checked. [2024-11-09 06:46:37,315 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-09 06:46:37,558 INFO L134 CoverageAnalysis]: Checked inductivity of 241 backedges. 30 proven. 31 refuted. 0 times theorem prover too weak. 180 trivial. 0 not checked. [2024-11-09 06:46:37,560 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1917988267] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-09 06:46:37,560 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [683933238] [2024-11-09 06:46:37,562 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2024-11-09 06:46:37,562 INFO L166 IcfgInterpreter]: Building call graph [2024-11-09 06:46:37,563 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-09 06:46:37,563 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-09 06:46:37,563 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-09 06:46:38,601 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-09 06:46:39,450 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '11043#true' at error location [2024-11-09 06:46:39,450 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-09 06:46:39,451 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-09 06:46:39,451 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 23 [2024-11-09 06:46:39,451 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1415556037] [2024-11-09 06:46:39,451 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-09 06:46:39,451 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 23 states [2024-11-09 06:46:39,451 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 06:46:39,452 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 23 interpolants. [2024-11-09 06:46:39,452 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=218, Invalid=1114, Unknown=0, NotChecked=0, Total=1332 [2024-11-09 06:46:39,452 INFO L87 Difference]: Start difference. First operand 101 states and 107 transitions. Second operand has 23 states, 23 states have (on average 3.9130434782608696) internal successors, (90), 23 states have internal predecessors, (90), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-09 06:46:40,097 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 06:46:40,097 INFO L93 Difference]: Finished difference Result 113 states and 119 transitions. [2024-11-09 06:46:40,097 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 20 states. [2024-11-09 06:46:40,097 INFO L78 Accepts]: Start accepts. Automaton has has 23 states, 23 states have (on average 3.9130434782608696) internal successors, (90), 23 states have internal predecessors, (90), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 100 [2024-11-09 06:46:40,098 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 06:46:40,098 INFO L225 Difference]: With dead ends: 113 [2024-11-09 06:46:40,099 INFO L226 Difference]: Without dead ends: 109 [2024-11-09 06:46:40,099 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 332 GetRequests, 269 SyntacticMatches, 16 SemanticMatches, 47 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 916 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=429, Invalid=1923, Unknown=0, NotChecked=0, Total=2352 [2024-11-09 06:46:40,100 INFO L432 NwaCegarLoop]: 10 mSDtfsCounter, 191 mSDsluCounter, 18 mSDsCounter, 0 mSdLazyCounter, 545 mSolverCounterSat, 209 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 191 SdHoareTripleChecker+Valid, 28 SdHoareTripleChecker+Invalid, 754 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 209 IncrementalHoareTripleChecker+Valid, 545 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2024-11-09 06:46:40,100 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [191 Valid, 28 Invalid, 754 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [209 Valid, 545 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2024-11-09 06:46:40,101 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 109 states. [2024-11-09 06:46:40,122 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 109 to 103. [2024-11-09 06:46:40,122 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 103 states, 102 states have (on average 1.0686274509803921) internal successors, (109), 102 states have internal predecessors, (109), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-09 06:46:40,122 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 103 states to 103 states and 109 transitions. [2024-11-09 06:46:40,123 INFO L78 Accepts]: Start accepts. Automaton has 103 states and 109 transitions. Word has length 100 [2024-11-09 06:46:40,123 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 06:46:40,123 INFO L471 AbstractCegarLoop]: Abstraction has 103 states and 109 transitions. [2024-11-09 06:46:40,123 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 23 states, 23 states have (on average 3.9130434782608696) internal successors, (90), 23 states have internal predecessors, (90), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-09 06:46:40,123 INFO L276 IsEmpty]: Start isEmpty. Operand 103 states and 109 transitions. [2024-11-09 06:46:40,124 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 103 [2024-11-09 06:46:40,124 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 06:46:40,124 INFO L215 NwaCegarLoop]: trace histogram [6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-09 06:46:40,144 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_627c9d95-6587-4b89-802d-015e259dbc56/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (15)] Forceful destruction successful, exit code 0 [2024-11-09 06:46:40,324 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 15 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_627c9d95-6587-4b89-802d-015e259dbc56/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2024-11-09 06:46:40,325 INFO L396 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 06:46:40,325 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 06:46:40,325 INFO L85 PathProgramCache]: Analyzing trace with hash 1938558580, now seen corresponding path program 15 times [2024-11-09 06:46:40,325 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 06:46:40,326 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2087442065] [2024-11-09 06:46:40,326 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 06:46:40,326 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 06:46:40,496 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 06:46:51,039 INFO L134 CoverageAnalysis]: Checked inductivity of 252 backedges. 2 proven. 250 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 06:46:51,039 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 06:46:51,040 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2087442065] [2024-11-09 06:46:51,040 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2087442065] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-09 06:46:51,040 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [239539206] [2024-11-09 06:46:51,040 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2024-11-09 06:46:51,040 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 06:46:51,040 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_627c9d95-6587-4b89-802d-015e259dbc56/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 06:46:51,041 INFO L229 MonitoredProcess]: Starting monitored process 16 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_627c9d95-6587-4b89-802d-015e259dbc56/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 06:46:51,043 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_627c9d95-6587-4b89-802d-015e259dbc56/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Waiting until timeout for monitored process [2024-11-09 06:46:51,189 INFO L227 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2024-11-09 06:46:51,189 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-09 06:46:51,195 INFO L255 TraceCheckSpWp]: Trace formula consists of 333 conjuncts, 151 conjuncts are in the unsatisfiable core [2024-11-09 06:46:51,200 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 06:46:52,801 INFO L134 CoverageAnalysis]: Checked inductivity of 252 backedges. 0 proven. 216 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2024-11-09 06:46:52,801 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-09 06:46:54,965 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2024-11-09 06:46:54,965 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 12 select indices, 12 select index equivalence classes, 0 disjoint index pairs (out of 66 index pairs), introduced 12 new quantified variables, introduced 66 case distinctions, treesize of input 103 treesize of output 335 [2024-11-09 06:46:56,814 INFO L134 CoverageAnalysis]: Checked inductivity of 252 backedges. 0 proven. 216 refuted. 0 times theorem prover too weak. 36 trivial. 0 not checked. [2024-11-09 06:46:56,815 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [239539206] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-09 06:46:56,815 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [944473117] [2024-11-09 06:46:56,816 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2024-11-09 06:46:56,816 INFO L166 IcfgInterpreter]: Building call graph [2024-11-09 06:46:56,817 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-09 06:46:56,817 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-09 06:46:56,817 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-09 06:46:57,881 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-09 06:47:00,539 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '12019#true' at error location [2024-11-09 06:47:00,539 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-09 06:47:00,539 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-09 06:47:00,540 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [54, 18, 18] total 82 [2024-11-09 06:47:00,540 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1133636959] [2024-11-09 06:47:00,540 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-09 06:47:00,541 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 82 states [2024-11-09 06:47:00,541 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 06:47:00,542 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 82 interpolants. [2024-11-09 06:47:00,543 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=503, Invalid=8809, Unknown=0, NotChecked=0, Total=9312 [2024-11-09 06:47:00,544 INFO L87 Difference]: Start difference. First operand 103 states and 109 transitions. Second operand has 82 states, 82 states have (on average 3.3902439024390243) internal successors, (278), 82 states have internal predecessors, (278), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-09 06:47:11,521 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 06:47:11,521 INFO L93 Difference]: Finished difference Result 377 states and 406 transitions. [2024-11-09 06:47:11,521 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 58 states. [2024-11-09 06:47:11,522 INFO L78 Accepts]: Start accepts. Automaton has has 82 states, 82 states have (on average 3.3902439024390243) internal successors, (278), 82 states have internal predecessors, (278), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 102 [2024-11-09 06:47:11,522 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 06:47:11,523 INFO L225 Difference]: With dead ends: 377 [2024-11-09 06:47:11,523 INFO L226 Difference]: Without dead ends: 299 [2024-11-09 06:47:11,525 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 410 GetRequests, 261 SyntacticMatches, 5 SemanticMatches, 144 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 5380 ImplicationChecksByTransitivity, 13.7s TimeCoverageRelationStatistics Valid=1589, Invalid=19581, Unknown=0, NotChecked=0, Total=21170 [2024-11-09 06:47:11,526 INFO L432 NwaCegarLoop]: 17 mSDtfsCounter, 776 mSDsluCounter, 233 mSDsCounter, 0 mSdLazyCounter, 6268 mSolverCounterSat, 787 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 776 SdHoareTripleChecker+Valid, 250 SdHoareTripleChecker+Invalid, 7055 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 787 IncrementalHoareTripleChecker+Valid, 6268 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.8s IncrementalHoareTripleChecker+Time [2024-11-09 06:47:11,526 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [776 Valid, 250 Invalid, 7055 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [787 Valid, 6268 Invalid, 0 Unknown, 0 Unchecked, 4.8s Time] [2024-11-09 06:47:11,527 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 299 states. [2024-11-09 06:47:11,578 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 299 to 229. [2024-11-09 06:47:11,578 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 229 states, 228 states have (on average 1.0701754385964912) internal successors, (244), 228 states have internal predecessors, (244), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-09 06:47:11,579 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 229 states to 229 states and 244 transitions. [2024-11-09 06:47:11,579 INFO L78 Accepts]: Start accepts. Automaton has 229 states and 244 transitions. Word has length 102 [2024-11-09 06:47:11,579 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 06:47:11,580 INFO L471 AbstractCegarLoop]: Abstraction has 229 states and 244 transitions. [2024-11-09 06:47:11,580 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 82 states, 82 states have (on average 3.3902439024390243) internal successors, (278), 82 states have internal predecessors, (278), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-09 06:47:11,580 INFO L276 IsEmpty]: Start isEmpty. Operand 229 states and 244 transitions. [2024-11-09 06:47:11,580 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 105 [2024-11-09 06:47:11,580 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 06:47:11,581 INFO L215 NwaCegarLoop]: trace histogram [7, 7, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-09 06:47:11,598 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_627c9d95-6587-4b89-802d-015e259dbc56/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (16)] Forceful destruction successful, exit code 0 [2024-11-09 06:47:11,781 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 16 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_627c9d95-6587-4b89-802d-015e259dbc56/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2024-11-09 06:47:11,781 INFO L396 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 06:47:11,782 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 06:47:11,782 INFO L85 PathProgramCache]: Analyzing trace with hash 1100980569, now seen corresponding path program 16 times [2024-11-09 06:47:11,782 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 06:47:11,782 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1562135724] [2024-11-09 06:47:11,782 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 06:47:11,782 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 06:47:11,799 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 06:47:12,015 INFO L134 CoverageAnalysis]: Checked inductivity of 265 backedges. 38 proven. 47 refuted. 0 times theorem prover too weak. 180 trivial. 0 not checked. [2024-11-09 06:47:12,016 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 06:47:12,016 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1562135724] [2024-11-09 06:47:12,016 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1562135724] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-09 06:47:12,016 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1430632762] [2024-11-09 06:47:12,016 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2024-11-09 06:47:12,016 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 06:47:12,016 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_627c9d95-6587-4b89-802d-015e259dbc56/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 06:47:12,018 INFO L229 MonitoredProcess]: Starting monitored process 17 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_627c9d95-6587-4b89-802d-015e259dbc56/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 06:47:12,021 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_627c9d95-6587-4b89-802d-015e259dbc56/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Waiting until timeout for monitored process [2024-11-09 06:47:12,131 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 06:47:12,132 INFO L255 TraceCheckSpWp]: Trace formula consists of 339 conjuncts, 16 conjuncts are in the unsatisfiable core [2024-11-09 06:47:12,134 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 06:47:12,346 INFO L134 CoverageAnalysis]: Checked inductivity of 265 backedges. 49 proven. 36 refuted. 0 times theorem prover too weak. 180 trivial. 0 not checked. [2024-11-09 06:47:12,347 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-09 06:47:12,520 INFO L134 CoverageAnalysis]: Checked inductivity of 265 backedges. 49 proven. 36 refuted. 0 times theorem prover too weak. 180 trivial. 0 not checked. [2024-11-09 06:47:12,521 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1430632762] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-09 06:47:12,521 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2012615018] [2024-11-09 06:47:12,522 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2024-11-09 06:47:12,523 INFO L166 IcfgInterpreter]: Building call graph [2024-11-09 06:47:12,523 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-09 06:47:12,523 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-09 06:47:12,523 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-09 06:47:13,394 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-09 06:47:14,315 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '13713#true' at error location [2024-11-09 06:47:14,315 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-09 06:47:14,316 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-09 06:47:14,316 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17] total 26 [2024-11-09 06:47:14,316 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2076377839] [2024-11-09 06:47:14,316 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-09 06:47:14,316 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2024-11-09 06:47:14,316 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 06:47:14,317 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2024-11-09 06:47:14,317 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=251, Invalid=1389, Unknown=0, NotChecked=0, Total=1640 [2024-11-09 06:47:14,317 INFO L87 Difference]: Start difference. First operand 229 states and 244 transitions. Second operand has 26 states, 26 states have (on average 2.8461538461538463) internal successors, (74), 26 states have internal predecessors, (74), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-09 06:47:14,976 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 06:47:14,977 INFO L93 Difference]: Finished difference Result 349 states and 372 transitions. [2024-11-09 06:47:14,977 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 17 states. [2024-11-09 06:47:14,977 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 2.8461538461538463) internal successors, (74), 26 states have internal predecessors, (74), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 104 [2024-11-09 06:47:14,977 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 06:47:14,978 INFO L225 Difference]: With dead ends: 349 [2024-11-09 06:47:14,978 INFO L226 Difference]: Without dead ends: 128 [2024-11-09 06:47:14,979 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 333 GetRequests, 271 SyntacticMatches, 17 SemanticMatches, 45 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 880 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=350, Invalid=1812, Unknown=0, NotChecked=0, Total=2162 [2024-11-09 06:47:14,980 INFO L432 NwaCegarLoop]: 10 mSDtfsCounter, 220 mSDsluCounter, 45 mSDsCounter, 0 mSdLazyCounter, 675 mSolverCounterSat, 245 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 220 SdHoareTripleChecker+Valid, 55 SdHoareTripleChecker+Invalid, 920 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 245 IncrementalHoareTripleChecker+Valid, 675 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2024-11-09 06:47:14,980 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [220 Valid, 55 Invalid, 920 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [245 Valid, 675 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2024-11-09 06:47:14,981 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 128 states. [2024-11-09 06:47:15,018 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 128 to 115. [2024-11-09 06:47:15,019 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 115 states, 114 states have (on average 1.0614035087719298) internal successors, (121), 114 states have internal predecessors, (121), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-09 06:47:15,019 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 115 states to 115 states and 121 transitions. [2024-11-09 06:47:15,020 INFO L78 Accepts]: Start accepts. Automaton has 115 states and 121 transitions. Word has length 104 [2024-11-09 06:47:15,020 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 06:47:15,020 INFO L471 AbstractCegarLoop]: Abstraction has 115 states and 121 transitions. [2024-11-09 06:47:15,020 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 26 states have (on average 2.8461538461538463) internal successors, (74), 26 states have internal predecessors, (74), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-09 06:47:15,021 INFO L276 IsEmpty]: Start isEmpty. Operand 115 states and 121 transitions. [2024-11-09 06:47:15,021 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 115 [2024-11-09 06:47:15,021 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 06:47:15,022 INFO L215 NwaCegarLoop]: trace histogram [7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 6, 6, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-09 06:47:15,042 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_627c9d95-6587-4b89-802d-015e259dbc56/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (17)] Ended with exit code 0 [2024-11-09 06:47:15,222 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 17 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_627c9d95-6587-4b89-802d-015e259dbc56/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2024-11-09 06:47:15,222 INFO L396 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 06:47:15,222 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 06:47:15,223 INFO L85 PathProgramCache]: Analyzing trace with hash 1644581938, now seen corresponding path program 17 times [2024-11-09 06:47:15,223 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 06:47:15,223 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [283125669] [2024-11-09 06:47:15,223 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 06:47:15,223 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 06:47:15,243 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 06:47:15,600 INFO L134 CoverageAnalysis]: Checked inductivity of 330 backedges. 25 proven. 60 refuted. 0 times theorem prover too weak. 245 trivial. 0 not checked. [2024-11-09 06:47:15,600 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 06:47:15,600 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [283125669] [2024-11-09 06:47:15,600 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [283125669] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-09 06:47:15,600 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [335462237] [2024-11-09 06:47:15,600 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2024-11-09 06:47:15,601 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 06:47:15,601 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_627c9d95-6587-4b89-802d-015e259dbc56/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 06:47:15,603 INFO L229 MonitoredProcess]: Starting monitored process 18 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_627c9d95-6587-4b89-802d-015e259dbc56/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 06:47:15,605 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_627c9d95-6587-4b89-802d-015e259dbc56/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Waiting until timeout for monitored process [2024-11-09 06:47:15,775 INFO L227 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 8 check-sat command(s) [2024-11-09 06:47:15,775 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-09 06:47:15,777 INFO L255 TraceCheckSpWp]: Trace formula consists of 371 conjuncts, 16 conjuncts are in the unsatisfiable core [2024-11-09 06:47:15,779 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 06:47:16,017 INFO L134 CoverageAnalysis]: Checked inductivity of 330 backedges. 42 proven. 43 refuted. 0 times theorem prover too weak. 245 trivial. 0 not checked. [2024-11-09 06:47:16,017 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-09 06:47:16,261 INFO L134 CoverageAnalysis]: Checked inductivity of 330 backedges. 42 proven. 43 refuted. 0 times theorem prover too weak. 245 trivial. 0 not checked. [2024-11-09 06:47:16,262 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [335462237] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-09 06:47:16,262 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [130434480] [2024-11-09 06:47:16,263 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2024-11-09 06:47:16,263 INFO L166 IcfgInterpreter]: Building call graph [2024-11-09 06:47:16,263 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-09 06:47:16,264 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-09 06:47:16,264 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-09 06:47:17,069 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-09 06:47:17,864 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '15067#true' at error location [2024-11-09 06:47:17,864 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-09 06:47:17,864 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-09 06:47:17,864 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 17, 17] total 26 [2024-11-09 06:47:17,864 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [564420564] [2024-11-09 06:47:17,865 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-09 06:47:17,865 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2024-11-09 06:47:17,865 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 06:47:17,866 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2024-11-09 06:47:17,866 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=253, Invalid=1307, Unknown=0, NotChecked=0, Total=1560 [2024-11-09 06:47:17,866 INFO L87 Difference]: Start difference. First operand 115 states and 121 transitions. Second operand has 26 states, 26 states have (on average 2.923076923076923) internal successors, (76), 26 states have internal predecessors, (76), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-09 06:47:18,601 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 06:47:18,601 INFO L93 Difference]: Finished difference Result 127 states and 133 transitions. [2024-11-09 06:47:18,601 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2024-11-09 06:47:18,601 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 26 states have (on average 2.923076923076923) internal successors, (76), 26 states have internal predecessors, (76), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 114 [2024-11-09 06:47:18,602 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 06:47:18,602 INFO L225 Difference]: With dead ends: 127 [2024-11-09 06:47:18,602 INFO L226 Difference]: Without dead ends: 123 [2024-11-09 06:47:18,603 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 371 GetRequests, 301 SyntacticMatches, 18 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1137 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=520, Invalid=2342, Unknown=0, NotChecked=0, Total=2862 [2024-11-09 06:47:18,603 INFO L432 NwaCegarLoop]: 10 mSDtfsCounter, 204 mSDsluCounter, 15 mSDsCounter, 0 mSdLazyCounter, 761 mSolverCounterSat, 208 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 204 SdHoareTripleChecker+Valid, 25 SdHoareTripleChecker+Invalid, 969 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 208 IncrementalHoareTripleChecker+Valid, 761 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2024-11-09 06:47:18,603 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [204 Valid, 25 Invalid, 969 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [208 Valid, 761 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2024-11-09 06:47:18,604 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 123 states. [2024-11-09 06:47:18,637 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 123 to 117. [2024-11-09 06:47:18,637 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 117 states, 116 states have (on average 1.0603448275862069) internal successors, (123), 116 states have internal predecessors, (123), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-09 06:47:18,638 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 117 states to 117 states and 123 transitions. [2024-11-09 06:47:18,638 INFO L78 Accepts]: Start accepts. Automaton has 117 states and 123 transitions. Word has length 114 [2024-11-09 06:47:18,638 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 06:47:18,638 INFO L471 AbstractCegarLoop]: Abstraction has 117 states and 123 transitions. [2024-11-09 06:47:18,639 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 26 states have (on average 2.923076923076923) internal successors, (76), 26 states have internal predecessors, (76), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-09 06:47:18,639 INFO L276 IsEmpty]: Start isEmpty. Operand 117 states and 123 transitions. [2024-11-09 06:47:18,639 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 117 [2024-11-09 06:47:18,639 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 06:47:18,639 INFO L215 NwaCegarLoop]: trace histogram [7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-09 06:47:18,656 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_627c9d95-6587-4b89-802d-015e259dbc56/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (18)] Forceful destruction successful, exit code 0 [2024-11-09 06:47:18,844 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18,18 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_627c9d95-6587-4b89-802d-015e259dbc56/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 06:47:18,844 INFO L396 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 06:47:18,845 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 06:47:18,845 INFO L85 PathProgramCache]: Analyzing trace with hash -308971241, now seen corresponding path program 18 times [2024-11-09 06:47:18,845 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 06:47:18,845 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1803578464] [2024-11-09 06:47:18,845 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 06:47:18,845 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 06:47:19,004 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 06:47:32,191 INFO L134 CoverageAnalysis]: Checked inductivity of 343 backedges. 20 proven. 323 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 06:47:32,192 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 06:47:32,192 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1803578464] [2024-11-09 06:47:32,192 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1803578464] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-09 06:47:32,192 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1602602939] [2024-11-09 06:47:32,192 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2024-11-09 06:47:32,193 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 06:47:32,193 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_627c9d95-6587-4b89-802d-015e259dbc56/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 06:47:32,194 INFO L229 MonitoredProcess]: Starting monitored process 19 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_627c9d95-6587-4b89-802d-015e259dbc56/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 06:47:32,198 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_627c9d95-6587-4b89-802d-015e259dbc56/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Waiting until timeout for monitored process [2024-11-09 06:47:32,359 INFO L227 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2024-11-09 06:47:32,360 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-09 06:47:32,364 INFO L255 TraceCheckSpWp]: Trace formula consists of 377 conjuncts, 175 conjuncts are in the unsatisfiable core [2024-11-09 06:47:32,370 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 06:47:34,649 INFO L134 CoverageAnalysis]: Checked inductivity of 343 backedges. 0 proven. 294 refuted. 0 times theorem prover too weak. 49 trivial. 0 not checked. [2024-11-09 06:47:34,649 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-09 06:47:37,617 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2024-11-09 06:47:37,617 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 14 select indices, 14 select index equivalence classes, 0 disjoint index pairs (out of 91 index pairs), introduced 14 new quantified variables, introduced 91 case distinctions, treesize of input 120 treesize of output 453 [2024-11-09 06:47:47,986 INFO L134 CoverageAnalysis]: Checked inductivity of 343 backedges. 0 proven. 294 refuted. 0 times theorem prover too weak. 49 trivial. 0 not checked. [2024-11-09 06:47:47,986 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1602602939] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-09 06:47:47,986 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [791986836] [2024-11-09 06:47:47,987 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2024-11-09 06:47:47,988 INFO L166 IcfgInterpreter]: Building call graph [2024-11-09 06:47:47,988 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-09 06:47:47,988 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-09 06:47:47,988 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-09 06:47:48,791 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-09 06:47:51,665 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '16169#true' at error location [2024-11-09 06:47:51,665 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-09 06:47:51,665 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-09 06:47:51,665 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [61, 20, 20] total 93 [2024-11-09 06:47:51,665 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1083275421] [2024-11-09 06:47:51,665 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-09 06:47:51,666 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 93 states [2024-11-09 06:47:51,666 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 06:47:51,667 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 93 interpolants. [2024-11-09 06:47:51,668 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=509, Invalid=11047, Unknown=0, NotChecked=0, Total=11556 [2024-11-09 06:47:51,669 INFO L87 Difference]: Start difference. First operand 117 states and 123 transitions. Second operand has 93 states, 93 states have (on average 3.3978494623655915) internal successors, (316), 93 states have internal predecessors, (316), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-09 06:48:10,031 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 06:48:10,031 INFO L93 Difference]: Finished difference Result 351 states and 377 transitions. [2024-11-09 06:48:10,031 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 79 states. [2024-11-09 06:48:10,032 INFO L78 Accepts]: Start accepts. Automaton has has 93 states, 93 states have (on average 3.3978494623655915) internal successors, (316), 93 states have internal predecessors, (316), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 116 [2024-11-09 06:48:10,032 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 06:48:10,034 INFO L225 Difference]: With dead ends: 351 [2024-11-09 06:48:10,034 INFO L226 Difference]: Without dead ends: 345 [2024-11-09 06:48:10,035 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 481 GetRequests, 299 SyntacticMatches, 5 SemanticMatches, 177 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 7375 ImplicationChecksByTransitivity, 20.9s TimeCoverageRelationStatistics Valid=2520, Invalid=29342, Unknown=0, NotChecked=0, Total=31862 [2024-11-09 06:48:10,036 INFO L432 NwaCegarLoop]: 16 mSDtfsCounter, 1083 mSDsluCounter, 277 mSDsCounter, 0 mSdLazyCounter, 8908 mSolverCounterSat, 1159 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 6.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1083 SdHoareTripleChecker+Valid, 293 SdHoareTripleChecker+Invalid, 10067 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1159 IncrementalHoareTripleChecker+Valid, 8908 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 7.3s IncrementalHoareTripleChecker+Time [2024-11-09 06:48:10,036 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [1083 Valid, 293 Invalid, 10067 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1159 Valid, 8908 Invalid, 0 Unknown, 0 Unchecked, 7.3s Time] [2024-11-09 06:48:10,037 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 345 states. [2024-11-09 06:48:10,093 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 345 to 220. [2024-11-09 06:48:10,093 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 220 states, 219 states have (on average 1.0684931506849316) internal successors, (234), 219 states have internal predecessors, (234), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-09 06:48:10,094 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 220 states to 220 states and 234 transitions. [2024-11-09 06:48:10,094 INFO L78 Accepts]: Start accepts. Automaton has 220 states and 234 transitions. Word has length 116 [2024-11-09 06:48:10,095 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 06:48:10,095 INFO L471 AbstractCegarLoop]: Abstraction has 220 states and 234 transitions. [2024-11-09 06:48:10,095 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 93 states, 93 states have (on average 3.3978494623655915) internal successors, (316), 93 states have internal predecessors, (316), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-09 06:48:10,096 INFO L276 IsEmpty]: Start isEmpty. Operand 220 states and 234 transitions. [2024-11-09 06:48:10,096 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 119 [2024-11-09 06:48:10,097 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 06:48:10,097 INFO L215 NwaCegarLoop]: trace histogram [8, 8, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-09 06:48:10,112 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_627c9d95-6587-4b89-802d-015e259dbc56/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (19)] Forceful destruction successful, exit code 0 [2024-11-09 06:48:10,297 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable19,19 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_627c9d95-6587-4b89-802d-015e259dbc56/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 06:48:10,297 INFO L396 AbstractCegarLoop]: === Iteration 21 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 06:48:10,298 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 06:48:10,298 INFO L85 PathProgramCache]: Analyzing trace with hash -474882244, now seen corresponding path program 19 times [2024-11-09 06:48:10,298 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 06:48:10,298 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [230302432] [2024-11-09 06:48:10,298 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 06:48:10,298 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 06:48:10,318 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 06:48:10,670 INFO L134 CoverageAnalysis]: Checked inductivity of 358 backedges. 51 proven. 62 refuted. 0 times theorem prover too weak. 245 trivial. 0 not checked. [2024-11-09 06:48:10,670 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 06:48:10,670 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [230302432] [2024-11-09 06:48:10,670 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [230302432] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-09 06:48:10,670 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1297557822] [2024-11-09 06:48:10,671 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2024-11-09 06:48:10,671 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 06:48:10,671 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_627c9d95-6587-4b89-802d-015e259dbc56/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 06:48:10,672 INFO L229 MonitoredProcess]: Starting monitored process 20 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_627c9d95-6587-4b89-802d-015e259dbc56/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 06:48:10,673 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_627c9d95-6587-4b89-802d-015e259dbc56/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Waiting until timeout for monitored process [2024-11-09 06:48:10,792 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 06:48:10,794 INFO L255 TraceCheckSpWp]: Trace formula consists of 383 conjuncts, 18 conjuncts are in the unsatisfiable core [2024-11-09 06:48:10,797 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 06:48:11,039 INFO L134 CoverageAnalysis]: Checked inductivity of 358 backedges. 64 proven. 49 refuted. 0 times theorem prover too weak. 245 trivial. 0 not checked. [2024-11-09 06:48:11,040 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-09 06:48:11,230 INFO L134 CoverageAnalysis]: Checked inductivity of 358 backedges. 64 proven. 49 refuted. 0 times theorem prover too weak. 245 trivial. 0 not checked. [2024-11-09 06:48:11,230 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1297557822] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-09 06:48:11,230 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [612402038] [2024-11-09 06:48:11,231 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2024-11-09 06:48:11,232 INFO L166 IcfgInterpreter]: Building call graph [2024-11-09 06:48:11,232 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-09 06:48:11,232 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-09 06:48:11,232 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-09 06:48:12,107 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-09 06:48:13,193 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '17949#true' at error location [2024-11-09 06:48:13,193 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-09 06:48:13,193 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-09 06:48:13,194 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19] total 29 [2024-11-09 06:48:13,194 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [68188507] [2024-11-09 06:48:13,194 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-09 06:48:13,194 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2024-11-09 06:48:13,194 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 06:48:13,195 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2024-11-09 06:48:13,195 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=290, Invalid=1602, Unknown=0, NotChecked=0, Total=1892 [2024-11-09 06:48:13,195 INFO L87 Difference]: Start difference. First operand 220 states and 234 transitions. Second operand has 29 states, 29 states have (on average 2.7586206896551726) internal successors, (80), 29 states have internal predecessors, (80), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-09 06:48:14,002 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 06:48:14,002 INFO L93 Difference]: Finished difference Result 409 states and 437 transitions. [2024-11-09 06:48:14,002 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2024-11-09 06:48:14,003 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 29 states have (on average 2.7586206896551726) internal successors, (80), 29 states have internal predecessors, (80), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 118 [2024-11-09 06:48:14,003 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 06:48:14,004 INFO L225 Difference]: With dead ends: 409 [2024-11-09 06:48:14,004 INFO L226 Difference]: Without dead ends: 142 [2024-11-09 06:48:14,005 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 378 GetRequests, 310 SyntacticMatches, 19 SemanticMatches, 49 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1057 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=416, Invalid=2134, Unknown=0, NotChecked=0, Total=2550 [2024-11-09 06:48:14,006 INFO L432 NwaCegarLoop]: 10 mSDtfsCounter, 303 mSDsluCounter, 30 mSDsCounter, 0 mSdLazyCounter, 662 mSolverCounterSat, 322 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 303 SdHoareTripleChecker+Valid, 40 SdHoareTripleChecker+Invalid, 984 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 322 IncrementalHoareTripleChecker+Valid, 662 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2024-11-09 06:48:14,007 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [303 Valid, 40 Invalid, 984 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [322 Valid, 662 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2024-11-09 06:48:14,008 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 142 states. [2024-11-09 06:48:14,046 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 142 to 129. [2024-11-09 06:48:14,047 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 129 states, 128 states have (on average 1.0546875) internal successors, (135), 128 states have internal predecessors, (135), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-09 06:48:14,047 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 129 states to 129 states and 135 transitions. [2024-11-09 06:48:14,048 INFO L78 Accepts]: Start accepts. Automaton has 129 states and 135 transitions. Word has length 118 [2024-11-09 06:48:14,048 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 06:48:14,048 INFO L471 AbstractCegarLoop]: Abstraction has 129 states and 135 transitions. [2024-11-09 06:48:14,048 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 29 states have (on average 2.7586206896551726) internal successors, (80), 29 states have internal predecessors, (80), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-09 06:48:14,048 INFO L276 IsEmpty]: Start isEmpty. Operand 129 states and 135 transitions. [2024-11-09 06:48:14,049 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 129 [2024-11-09 06:48:14,049 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 06:48:14,049 INFO L215 NwaCegarLoop]: trace histogram [8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 7, 7, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-09 06:48:14,065 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_627c9d95-6587-4b89-802d-015e259dbc56/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (20)] Forceful destruction successful, exit code 0 [2024-11-09 06:48:14,250 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable20,20 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_627c9d95-6587-4b89-802d-015e259dbc56/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 06:48:14,250 INFO L396 AbstractCegarLoop]: === Iteration 22 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 06:48:14,250 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 06:48:14,250 INFO L85 PathProgramCache]: Analyzing trace with hash 771433045, now seen corresponding path program 20 times [2024-11-09 06:48:14,251 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 06:48:14,251 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [918857611] [2024-11-09 06:48:14,251 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 06:48:14,251 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 06:48:14,273 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 06:48:14,560 INFO L134 CoverageAnalysis]: Checked inductivity of 433 backedges. 36 proven. 77 refuted. 0 times theorem prover too weak. 320 trivial. 0 not checked. [2024-11-09 06:48:14,560 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 06:48:14,560 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [918857611] [2024-11-09 06:48:14,561 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [918857611] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-09 06:48:14,561 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1772942630] [2024-11-09 06:48:14,561 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2024-11-09 06:48:14,561 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 06:48:14,561 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_627c9d95-6587-4b89-802d-015e259dbc56/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 06:48:14,562 INFO L229 MonitoredProcess]: Starting monitored process 21 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_627c9d95-6587-4b89-802d-015e259dbc56/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 06:48:14,563 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_627c9d95-6587-4b89-802d-015e259dbc56/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Waiting until timeout for monitored process [2024-11-09 06:48:14,743 INFO L227 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2024-11-09 06:48:14,743 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-09 06:48:14,746 INFO L255 TraceCheckSpWp]: Trace formula consists of 415 conjuncts, 18 conjuncts are in the unsatisfiable core [2024-11-09 06:48:14,749 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 06:48:14,971 INFO L134 CoverageAnalysis]: Checked inductivity of 433 backedges. 56 proven. 57 refuted. 0 times theorem prover too weak. 320 trivial. 0 not checked. [2024-11-09 06:48:14,971 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-09 06:48:15,182 INFO L134 CoverageAnalysis]: Checked inductivity of 433 backedges. 56 proven. 57 refuted. 0 times theorem prover too weak. 320 trivial. 0 not checked. [2024-11-09 06:48:15,183 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1772942630] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-09 06:48:15,183 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [551833979] [2024-11-09 06:48:15,185 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2024-11-09 06:48:15,185 INFO L166 IcfgInterpreter]: Building call graph [2024-11-09 06:48:15,185 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-09 06:48:15,186 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-09 06:48:15,186 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-09 06:48:16,102 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-09 06:48:16,924 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '19503#true' at error location [2024-11-09 06:48:16,925 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-09 06:48:16,925 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-09 06:48:16,925 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [19, 19, 19] total 29 [2024-11-09 06:48:16,925 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1388450382] [2024-11-09 06:48:16,925 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-09 06:48:16,926 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2024-11-09 06:48:16,926 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 06:48:16,926 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2024-11-09 06:48:16,927 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=292, Invalid=1514, Unknown=0, NotChecked=0, Total=1806 [2024-11-09 06:48:16,927 INFO L87 Difference]: Start difference. First operand 129 states and 135 transitions. Second operand has 29 states, 29 states have (on average 3.793103448275862) internal successors, (110), 29 states have internal predecessors, (110), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-09 06:48:17,890 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 06:48:17,890 INFO L93 Difference]: Finished difference Result 141 states and 147 transitions. [2024-11-09 06:48:17,890 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 26 states. [2024-11-09 06:48:17,891 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 29 states have (on average 3.793103448275862) internal successors, (110), 29 states have internal predecessors, (110), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 128 [2024-11-09 06:48:17,891 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 06:48:17,892 INFO L225 Difference]: With dead ends: 141 [2024-11-09 06:48:17,892 INFO L226 Difference]: Without dead ends: 137 [2024-11-09 06:48:17,893 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 426 GetRequests, 349 SyntacticMatches, 20 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1380 ImplicationChecksByTransitivity, 1.5s TimeCoverageRelationStatistics Valid=621, Invalid=2801, Unknown=0, NotChecked=0, Total=3422 [2024-11-09 06:48:17,893 INFO L432 NwaCegarLoop]: 10 mSDtfsCounter, 181 mSDsluCounter, 39 mSDsCounter, 0 mSdLazyCounter, 1076 mSolverCounterSat, 194 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 181 SdHoareTripleChecker+Valid, 49 SdHoareTripleChecker+Invalid, 1270 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 194 IncrementalHoareTripleChecker+Valid, 1076 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2024-11-09 06:48:17,894 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [181 Valid, 49 Invalid, 1270 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [194 Valid, 1076 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2024-11-09 06:48:17,895 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 137 states. [2024-11-09 06:48:17,946 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 137 to 131. [2024-11-09 06:48:17,946 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 131 states, 130 states have (on average 1.0538461538461539) internal successors, (137), 130 states have internal predecessors, (137), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-09 06:48:17,947 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 131 states to 131 states and 137 transitions. [2024-11-09 06:48:17,947 INFO L78 Accepts]: Start accepts. Automaton has 131 states and 137 transitions. Word has length 128 [2024-11-09 06:48:17,948 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 06:48:17,948 INFO L471 AbstractCegarLoop]: Abstraction has 131 states and 137 transitions. [2024-11-09 06:48:17,948 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 29 states have (on average 3.793103448275862) internal successors, (110), 29 states have internal predecessors, (110), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-09 06:48:17,948 INFO L276 IsEmpty]: Start isEmpty. Operand 131 states and 137 transitions. [2024-11-09 06:48:17,949 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 131 [2024-11-09 06:48:17,949 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 06:48:17,949 INFO L215 NwaCegarLoop]: trace histogram [8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-09 06:48:17,964 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_627c9d95-6587-4b89-802d-015e259dbc56/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (21)] Forceful destruction successful, exit code 0 [2024-11-09 06:48:18,149 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable21,21 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_627c9d95-6587-4b89-802d-015e259dbc56/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 06:48:18,150 INFO L396 AbstractCegarLoop]: === Iteration 23 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 06:48:18,150 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 06:48:18,150 INFO L85 PathProgramCache]: Analyzing trace with hash -1886434694, now seen corresponding path program 21 times [2024-11-09 06:48:18,150 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 06:48:18,150 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [341970446] [2024-11-09 06:48:18,150 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 06:48:18,150 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 06:48:18,321 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 06:48:35,531 INFO L134 CoverageAnalysis]: Checked inductivity of 448 backedges. 30 proven. 418 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 06:48:35,531 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 06:48:35,531 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [341970446] [2024-11-09 06:48:35,531 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [341970446] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-09 06:48:35,532 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1248264536] [2024-11-09 06:48:35,532 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2024-11-09 06:48:35,532 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 06:48:35,532 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_627c9d95-6587-4b89-802d-015e259dbc56/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 06:48:35,533 INFO L229 MonitoredProcess]: Starting monitored process 22 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_627c9d95-6587-4b89-802d-015e259dbc56/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 06:48:35,535 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_627c9d95-6587-4b89-802d-015e259dbc56/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Waiting until timeout for monitored process [2024-11-09 06:48:35,713 INFO L227 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2024-11-09 06:48:35,714 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-09 06:48:35,718 INFO L255 TraceCheckSpWp]: Trace formula consists of 421 conjuncts, 203 conjuncts are in the unsatisfiable core [2024-11-09 06:48:35,725 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 06:48:35,863 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 1 [2024-11-09 06:48:38,634 INFO L134 CoverageAnalysis]: Checked inductivity of 448 backedges. 0 proven. 384 refuted. 0 times theorem prover too weak. 64 trivial. 0 not checked. [2024-11-09 06:48:38,634 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-09 06:48:41,905 INFO L134 CoverageAnalysis]: Checked inductivity of 448 backedges. 0 proven. 384 refuted. 0 times theorem prover too weak. 64 trivial. 0 not checked. [2024-11-09 06:48:41,906 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1248264536] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-09 06:48:41,906 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1453319477] [2024-11-09 06:48:41,907 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2024-11-09 06:48:41,908 INFO L166 IcfgInterpreter]: Building call graph [2024-11-09 06:48:41,908 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-09 06:48:41,908 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-09 06:48:41,908 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-09 06:48:43,037 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-09 06:48:46,269 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '20747#true' at error location [2024-11-09 06:48:46,269 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-09 06:48:46,269 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-09 06:48:46,269 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [68, 22, 21] total 103 [2024-11-09 06:48:46,270 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [631525904] [2024-11-09 06:48:46,270 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-09 06:48:46,270 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 103 states [2024-11-09 06:48:46,271 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 06:48:46,272 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 103 interpolants. [2024-11-09 06:48:46,273 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=565, Invalid=13241, Unknown=0, NotChecked=0, Total=13806 [2024-11-09 06:48:46,273 INFO L87 Difference]: Start difference. First operand 131 states and 137 transitions. Second operand has 103 states, 103 states have (on average 3.436893203883495) internal successors, (354), 103 states have internal predecessors, (354), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-09 06:49:09,184 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 06:49:09,184 INFO L93 Difference]: Finished difference Result 389 states and 415 transitions. [2024-11-09 06:49:09,185 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 87 states. [2024-11-09 06:49:09,185 INFO L78 Accepts]: Start accepts. Automaton has has 103 states, 103 states have (on average 3.436893203883495) internal successors, (354), 103 states have internal predecessors, (354), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 130 [2024-11-09 06:49:09,185 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 06:49:09,187 INFO L225 Difference]: With dead ends: 389 [2024-11-09 06:49:09,187 INFO L226 Difference]: Without dead ends: 383 [2024-11-09 06:49:09,190 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 537 GetRequests, 338 SyntacticMatches, 5 SemanticMatches, 194 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8772 ImplicationChecksByTransitivity, 26.5s TimeCoverageRelationStatistics Valid=2890, Invalid=35330, Unknown=0, NotChecked=0, Total=38220 [2024-11-09 06:49:09,190 INFO L432 NwaCegarLoop]: 16 mSDtfsCounter, 1213 mSDsluCounter, 239 mSDsCounter, 0 mSdLazyCounter, 9768 mSolverCounterSat, 1276 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 7.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1213 SdHoareTripleChecker+Valid, 255 SdHoareTripleChecker+Invalid, 11044 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 1276 IncrementalHoareTripleChecker+Valid, 9768 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 8.7s IncrementalHoareTripleChecker+Time [2024-11-09 06:49:09,191 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [1213 Valid, 255 Invalid, 11044 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [1276 Valid, 9768 Invalid, 0 Unknown, 0 Unchecked, 8.7s Time] [2024-11-09 06:49:09,191 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 383 states. [2024-11-09 06:49:09,275 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 383 to 246. [2024-11-09 06:49:09,275 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 246 states, 245 states have (on average 1.0612244897959184) internal successors, (260), 245 states have internal predecessors, (260), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-09 06:49:09,276 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 246 states to 246 states and 260 transitions. [2024-11-09 06:49:09,277 INFO L78 Accepts]: Start accepts. Automaton has 246 states and 260 transitions. Word has length 130 [2024-11-09 06:49:09,277 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 06:49:09,277 INFO L471 AbstractCegarLoop]: Abstraction has 246 states and 260 transitions. [2024-11-09 06:49:09,278 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 103 states, 103 states have (on average 3.436893203883495) internal successors, (354), 103 states have internal predecessors, (354), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-09 06:49:09,278 INFO L276 IsEmpty]: Start isEmpty. Operand 246 states and 260 transitions. [2024-11-09 06:49:09,279 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 133 [2024-11-09 06:49:09,279 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 06:49:09,279 INFO L215 NwaCegarLoop]: trace histogram [9, 9, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-09 06:49:09,301 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_627c9d95-6587-4b89-802d-015e259dbc56/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (22)] Ended with exit code 0 [2024-11-09 06:49:09,479 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable22,22 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_627c9d95-6587-4b89-802d-015e259dbc56/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 06:49:09,479 INFO L396 AbstractCegarLoop]: === Iteration 24 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 06:49:09,480 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 06:49:09,480 INFO L85 PathProgramCache]: Analyzing trace with hash -1732127777, now seen corresponding path program 22 times [2024-11-09 06:49:09,480 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 06:49:09,480 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2013811614] [2024-11-09 06:49:09,480 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 06:49:09,480 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 06:49:09,502 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 06:49:09,807 INFO L134 CoverageAnalysis]: Checked inductivity of 465 backedges. 66 proven. 79 refuted. 0 times theorem prover too weak. 320 trivial. 0 not checked. [2024-11-09 06:49:09,808 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 06:49:09,808 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2013811614] [2024-11-09 06:49:09,808 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2013811614] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-09 06:49:09,808 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1107680169] [2024-11-09 06:49:09,808 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2024-11-09 06:49:09,808 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 06:49:09,808 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_627c9d95-6587-4b89-802d-015e259dbc56/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 06:49:09,809 INFO L229 MonitoredProcess]: Starting monitored process 23 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_627c9d95-6587-4b89-802d-015e259dbc56/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 06:49:09,810 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_627c9d95-6587-4b89-802d-015e259dbc56/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Waiting until timeout for monitored process [2024-11-09 06:49:09,955 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 06:49:09,957 INFO L255 TraceCheckSpWp]: Trace formula consists of 427 conjuncts, 20 conjuncts are in the unsatisfiable core [2024-11-09 06:49:09,960 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 06:49:10,238 INFO L134 CoverageAnalysis]: Checked inductivity of 465 backedges. 81 proven. 64 refuted. 0 times theorem prover too weak. 320 trivial. 0 not checked. [2024-11-09 06:49:10,239 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-09 06:49:10,531 INFO L134 CoverageAnalysis]: Checked inductivity of 465 backedges. 81 proven. 64 refuted. 0 times theorem prover too weak. 320 trivial. 0 not checked. [2024-11-09 06:49:10,531 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1107680169] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-09 06:49:10,532 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1055781355] [2024-11-09 06:49:10,533 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2024-11-09 06:49:10,533 INFO L166 IcfgInterpreter]: Building call graph [2024-11-09 06:49:10,533 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-09 06:49:10,533 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-09 06:49:10,533 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-09 06:49:11,399 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-09 06:49:12,391 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '22731#true' at error location [2024-11-09 06:49:12,391 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-09 06:49:12,391 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-09 06:49:12,391 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 21] total 32 [2024-11-09 06:49:12,391 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [396670702] [2024-11-09 06:49:12,391 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-09 06:49:12,392 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2024-11-09 06:49:12,392 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 06:49:12,393 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2024-11-09 06:49:12,393 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=333, Invalid=1829, Unknown=0, NotChecked=0, Total=2162 [2024-11-09 06:49:12,393 INFO L87 Difference]: Start difference. First operand 246 states and 260 transitions. Second operand has 32 states, 32 states have (on average 2.6875) internal successors, (86), 32 states have internal predecessors, (86), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-09 06:49:13,485 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 06:49:13,485 INFO L93 Difference]: Finished difference Result 455 states and 483 transitions. [2024-11-09 06:49:13,485 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 21 states. [2024-11-09 06:49:13,486 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 2.6875) internal successors, (86), 32 states have internal predecessors, (86), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 132 [2024-11-09 06:49:13,486 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 06:49:13,487 INFO L225 Difference]: With dead ends: 455 [2024-11-09 06:49:13,487 INFO L226 Difference]: Without dead ends: 156 [2024-11-09 06:49:13,488 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 423 GetRequests, 349 SyntacticMatches, 21 SemanticMatches, 53 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1249 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=489, Invalid=2481, Unknown=0, NotChecked=0, Total=2970 [2024-11-09 06:49:13,488 INFO L432 NwaCegarLoop]: 10 mSDtfsCounter, 292 mSDsluCounter, 30 mSDsCounter, 0 mSdLazyCounter, 817 mSolverCounterSat, 321 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 292 SdHoareTripleChecker+Valid, 40 SdHoareTripleChecker+Invalid, 1138 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 321 IncrementalHoareTripleChecker+Valid, 817 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2024-11-09 06:49:13,489 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [292 Valid, 40 Invalid, 1138 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [321 Valid, 817 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2024-11-09 06:49:13,489 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 156 states. [2024-11-09 06:49:13,550 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 156 to 143. [2024-11-09 06:49:13,550 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 143 states, 142 states have (on average 1.0492957746478873) internal successors, (149), 142 states have internal predecessors, (149), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-09 06:49:13,551 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 143 states to 143 states and 149 transitions. [2024-11-09 06:49:13,552 INFO L78 Accepts]: Start accepts. Automaton has 143 states and 149 transitions. Word has length 132 [2024-11-09 06:49:13,552 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 06:49:13,552 INFO L471 AbstractCegarLoop]: Abstraction has 143 states and 149 transitions. [2024-11-09 06:49:13,552 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 32 states have (on average 2.6875) internal successors, (86), 32 states have internal predecessors, (86), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-09 06:49:13,553 INFO L276 IsEmpty]: Start isEmpty. Operand 143 states and 149 transitions. [2024-11-09 06:49:13,553 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 143 [2024-11-09 06:49:13,553 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 06:49:13,554 INFO L215 NwaCegarLoop]: trace histogram [9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 8, 8, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-09 06:49:13,575 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_627c9d95-6587-4b89-802d-015e259dbc56/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (23)] Ended with exit code 0 [2024-11-09 06:49:13,754 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable23,23 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_627c9d95-6587-4b89-802d-015e259dbc56/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 06:49:13,754 INFO L396 AbstractCegarLoop]: === Iteration 25 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 06:49:13,754 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 06:49:13,755 INFO L85 PathProgramCache]: Analyzing trace with hash -1666959560, now seen corresponding path program 23 times [2024-11-09 06:49:13,755 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 06:49:13,755 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [11852226] [2024-11-09 06:49:13,755 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 06:49:13,755 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 06:49:13,792 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 06:49:14,177 INFO L134 CoverageAnalysis]: Checked inductivity of 550 backedges. 49 proven. 96 refuted. 0 times theorem prover too weak. 405 trivial. 0 not checked. [2024-11-09 06:49:14,177 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 06:49:14,177 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [11852226] [2024-11-09 06:49:14,178 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [11852226] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-09 06:49:14,178 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1268610516] [2024-11-09 06:49:14,178 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2024-11-09 06:49:14,178 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 06:49:14,178 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_627c9d95-6587-4b89-802d-015e259dbc56/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 06:49:14,179 INFO L229 MonitoredProcess]: Starting monitored process 24 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_627c9d95-6587-4b89-802d-015e259dbc56/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 06:49:14,180 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_627c9d95-6587-4b89-802d-015e259dbc56/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Waiting until timeout for monitored process [2024-11-09 06:49:14,424 INFO L227 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 10 check-sat command(s) [2024-11-09 06:49:14,425 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-09 06:49:14,427 INFO L255 TraceCheckSpWp]: Trace formula consists of 459 conjuncts, 20 conjuncts are in the unsatisfiable core [2024-11-09 06:49:14,429 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 06:49:14,706 INFO L134 CoverageAnalysis]: Checked inductivity of 550 backedges. 72 proven. 73 refuted. 0 times theorem prover too weak. 405 trivial. 0 not checked. [2024-11-09 06:49:14,706 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-09 06:49:15,001 INFO L134 CoverageAnalysis]: Checked inductivity of 550 backedges. 72 proven. 73 refuted. 0 times theorem prover too weak. 405 trivial. 0 not checked. [2024-11-09 06:49:15,001 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1268610516] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-09 06:49:15,001 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [53367949] [2024-11-09 06:49:15,002 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2024-11-09 06:49:15,003 INFO L166 IcfgInterpreter]: Building call graph [2024-11-09 06:49:15,003 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-09 06:49:15,003 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-09 06:49:15,003 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-09 06:49:15,815 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-09 06:49:16,653 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '24464#true' at error location [2024-11-09 06:49:16,653 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-09 06:49:16,653 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-09 06:49:16,653 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [21, 21, 21] total 32 [2024-11-09 06:49:16,653 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1394633919] [2024-11-09 06:49:16,653 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-09 06:49:16,654 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 32 states [2024-11-09 06:49:16,654 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 06:49:16,654 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 32 interpolants. [2024-11-09 06:49:16,655 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=335, Invalid=1735, Unknown=0, NotChecked=0, Total=2070 [2024-11-09 06:49:16,655 INFO L87 Difference]: Start difference. First operand 143 states and 149 transitions. Second operand has 32 states, 32 states have (on average 3.4375) internal successors, (110), 32 states have internal predecessors, (110), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-09 06:49:17,636 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 06:49:17,636 INFO L93 Difference]: Finished difference Result 155 states and 161 transitions. [2024-11-09 06:49:17,637 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2024-11-09 06:49:17,637 INFO L78 Accepts]: Start accepts. Automaton has has 32 states, 32 states have (on average 3.4375) internal successors, (110), 32 states have internal predecessors, (110), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 142 [2024-11-09 06:49:17,637 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 06:49:17,638 INFO L225 Difference]: With dead ends: 155 [2024-11-09 06:49:17,638 INFO L226 Difference]: Without dead ends: 151 [2024-11-09 06:49:17,639 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 473 GetRequests, 389 SyntacticMatches, 22 SemanticMatches, 62 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1645 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=732, Invalid=3300, Unknown=0, NotChecked=0, Total=4032 [2024-11-09 06:49:17,640 INFO L432 NwaCegarLoop]: 10 mSDtfsCounter, 342 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 835 mSolverCounterSat, 349 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 342 SdHoareTripleChecker+Valid, 22 SdHoareTripleChecker+Invalid, 1184 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 349 IncrementalHoareTripleChecker+Valid, 835 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2024-11-09 06:49:17,640 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [342 Valid, 22 Invalid, 1184 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [349 Valid, 835 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2024-11-09 06:49:17,641 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 151 states. [2024-11-09 06:49:17,708 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 151 to 145. [2024-11-09 06:49:17,709 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 145 states, 144 states have (on average 1.0486111111111112) internal successors, (151), 144 states have internal predecessors, (151), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-09 06:49:17,710 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 145 states to 145 states and 151 transitions. [2024-11-09 06:49:17,710 INFO L78 Accepts]: Start accepts. Automaton has 145 states and 151 transitions. Word has length 142 [2024-11-09 06:49:17,711 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 06:49:17,711 INFO L471 AbstractCegarLoop]: Abstraction has 145 states and 151 transitions. [2024-11-09 06:49:17,711 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 32 states, 32 states have (on average 3.4375) internal successors, (110), 32 states have internal predecessors, (110), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-09 06:49:17,711 INFO L276 IsEmpty]: Start isEmpty. Operand 145 states and 151 transitions. [2024-11-09 06:49:17,712 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 145 [2024-11-09 06:49:17,712 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 06:49:17,712 INFO L215 NwaCegarLoop]: trace histogram [9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-09 06:49:17,735 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_627c9d95-6587-4b89-802d-015e259dbc56/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (24)] Forceful destruction successful, exit code 0 [2024-11-09 06:49:17,913 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 24 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_627c9d95-6587-4b89-802d-015e259dbc56/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable24 [2024-11-09 06:49:17,913 INFO L396 AbstractCegarLoop]: === Iteration 26 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 06:49:17,914 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 06:49:17,914 INFO L85 PathProgramCache]: Analyzing trace with hash -129584483, now seen corresponding path program 24 times [2024-11-09 06:49:17,914 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 06:49:17,915 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1638010593] [2024-11-09 06:49:17,915 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 06:49:17,915 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 06:49:18,173 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 06:49:39,643 INFO L134 CoverageAnalysis]: Checked inductivity of 567 backedges. 43 proven. 524 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 06:49:39,643 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 06:49:39,643 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1638010593] [2024-11-09 06:49:39,643 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1638010593] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-09 06:49:39,643 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2145126602] [2024-11-09 06:49:39,643 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2024-11-09 06:49:39,644 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 06:49:39,644 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_627c9d95-6587-4b89-802d-015e259dbc56/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 06:49:39,645 INFO L229 MonitoredProcess]: Starting monitored process 25 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_627c9d95-6587-4b89-802d-015e259dbc56/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 06:49:39,646 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_627c9d95-6587-4b89-802d-015e259dbc56/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Waiting until timeout for monitored process [2024-11-09 06:49:39,811 INFO L227 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2024-11-09 06:49:39,811 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-09 06:49:39,816 INFO L255 TraceCheckSpWp]: Trace formula consists of 465 conjuncts, 223 conjuncts are in the unsatisfiable core [2024-11-09 06:49:39,822 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 06:49:43,125 INFO L134 CoverageAnalysis]: Checked inductivity of 567 backedges. 0 proven. 486 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2024-11-09 06:49:43,125 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-09 06:49:48,376 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2024-11-09 06:49:48,377 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 18 select indices, 18 select index equivalence classes, 0 disjoint index pairs (out of 153 index pairs), introduced 18 new quantified variables, introduced 153 case distinctions, treesize of input 154 treesize of output 743 [2024-11-09 06:50:11,403 INFO L134 CoverageAnalysis]: Checked inductivity of 567 backedges. 0 proven. 486 refuted. 0 times theorem prover too weak. 81 trivial. 0 not checked. [2024-11-09 06:50:11,404 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2145126602] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-09 06:50:11,404 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1987860702] [2024-11-09 06:50:11,405 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2024-11-09 06:50:11,405 INFO L166 IcfgInterpreter]: Building call graph [2024-11-09 06:50:11,405 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-09 06:50:11,405 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-09 06:50:11,405 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-09 06:50:12,196 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-09 06:50:15,860 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '25842#true' at error location [2024-11-09 06:50:15,860 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-09 06:50:15,860 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-09 06:50:15,860 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [75, 24, 24] total 115 [2024-11-09 06:50:15,861 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [814230542] [2024-11-09 06:50:15,861 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-09 06:50:15,861 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 115 states [2024-11-09 06:50:15,862 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 06:50:15,863 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 115 interpolants. [2024-11-09 06:50:15,864 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=640, Invalid=16130, Unknown=0, NotChecked=0, Total=16770 [2024-11-09 06:50:15,865 INFO L87 Difference]: Start difference. First operand 145 states and 151 transitions. Second operand has 115 states, 115 states have (on average 3.408695652173913) internal successors, (392), 115 states have internal predecessors, (392), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-09 06:50:43,955 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 06:50:43,955 INFO L93 Difference]: Finished difference Result 427 states and 453 transitions. [2024-11-09 06:50:43,955 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 95 states. [2024-11-09 06:50:43,956 INFO L78 Accepts]: Start accepts. Automaton has has 115 states, 115 states have (on average 3.408695652173913) internal successors, (392), 115 states have internal predecessors, (392), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 144 [2024-11-09 06:50:43,956 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 06:50:43,958 INFO L225 Difference]: With dead ends: 427 [2024-11-09 06:50:43,958 INFO L226 Difference]: Without dead ends: 421 [2024-11-09 06:50:43,961 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 594 GetRequests, 375 SyntacticMatches, 5 SemanticMatches, 214 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11021 ImplicationChecksByTransitivity, 32.4s TimeCoverageRelationStatistics Valid=3367, Invalid=43073, Unknown=0, NotChecked=0, Total=46440 [2024-11-09 06:50:43,962 INFO L432 NwaCegarLoop]: 16 mSDtfsCounter, 1315 mSDsluCounter, 270 mSDsCounter, 0 mSdLazyCounter, 11578 mSolverCounterSat, 1328 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 9.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1315 SdHoareTripleChecker+Valid, 286 SdHoareTripleChecker+Invalid, 12906 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 1328 IncrementalHoareTripleChecker+Valid, 11578 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 10.5s IncrementalHoareTripleChecker+Time [2024-11-09 06:50:43,962 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [1315 Valid, 286 Invalid, 12906 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [1328 Valid, 11578 Invalid, 0 Unknown, 0 Unchecked, 10.5s Time] [2024-11-09 06:50:43,963 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 421 states. [2024-11-09 06:50:44,058 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 421 to 272. [2024-11-09 06:50:44,059 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 272 states, 271 states have (on average 1.055350553505535) internal successors, (286), 271 states have internal predecessors, (286), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-09 06:50:44,060 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 272 states to 272 states and 286 transitions. [2024-11-09 06:50:44,061 INFO L78 Accepts]: Start accepts. Automaton has 272 states and 286 transitions. Word has length 144 [2024-11-09 06:50:44,061 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 06:50:44,061 INFO L471 AbstractCegarLoop]: Abstraction has 272 states and 286 transitions. [2024-11-09 06:50:44,061 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 115 states, 115 states have (on average 3.408695652173913) internal successors, (392), 115 states have internal predecessors, (392), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-09 06:50:44,061 INFO L276 IsEmpty]: Start isEmpty. Operand 272 states and 286 transitions. [2024-11-09 06:50:44,062 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 147 [2024-11-09 06:50:44,062 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 06:50:44,063 INFO L215 NwaCegarLoop]: trace histogram [10, 10, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-09 06:50:44,080 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_627c9d95-6587-4b89-802d-015e259dbc56/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (25)] Forceful destruction successful, exit code 0 [2024-11-09 06:50:44,263 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 25 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_627c9d95-6587-4b89-802d-015e259dbc56/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable25 [2024-11-09 06:50:44,264 INFO L396 AbstractCegarLoop]: === Iteration 27 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 06:50:44,264 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 06:50:44,264 INFO L85 PathProgramCache]: Analyzing trace with hash 923840322, now seen corresponding path program 25 times [2024-11-09 06:50:44,264 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 06:50:44,264 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2033213168] [2024-11-09 06:50:44,264 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 06:50:44,265 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 06:50:44,302 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 06:50:44,717 INFO L134 CoverageAnalysis]: Checked inductivity of 586 backedges. 83 proven. 98 refuted. 0 times theorem prover too weak. 405 trivial. 0 not checked. [2024-11-09 06:50:44,717 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 06:50:44,717 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2033213168] [2024-11-09 06:50:44,717 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2033213168] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-09 06:50:44,717 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1353244659] [2024-11-09 06:50:44,717 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2024-11-09 06:50:44,717 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 06:50:44,718 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_627c9d95-6587-4b89-802d-015e259dbc56/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 06:50:44,719 INFO L229 MonitoredProcess]: Starting monitored process 26 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_627c9d95-6587-4b89-802d-015e259dbc56/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 06:50:44,720 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_627c9d95-6587-4b89-802d-015e259dbc56/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Waiting until timeout for monitored process [2024-11-09 06:50:44,878 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 06:50:44,881 INFO L255 TraceCheckSpWp]: Trace formula consists of 471 conjuncts, 22 conjuncts are in the unsatisfiable core [2024-11-09 06:50:44,883 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 06:50:45,348 INFO L134 CoverageAnalysis]: Checked inductivity of 586 backedges. 100 proven. 81 refuted. 0 times theorem prover too weak. 405 trivial. 0 not checked. [2024-11-09 06:50:45,348 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-09 06:50:45,623 INFO L134 CoverageAnalysis]: Checked inductivity of 586 backedges. 100 proven. 81 refuted. 0 times theorem prover too weak. 405 trivial. 0 not checked. [2024-11-09 06:50:45,623 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1353244659] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-09 06:50:45,623 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1477905272] [2024-11-09 06:50:45,625 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2024-11-09 06:50:45,625 INFO L166 IcfgInterpreter]: Building call graph [2024-11-09 06:50:45,625 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-09 06:50:45,625 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-09 06:50:45,625 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-09 06:50:46,526 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-09 06:50:47,578 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '28034#true' at error location [2024-11-09 06:50:47,578 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-09 06:50:47,578 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-09 06:50:47,578 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 23, 23] total 35 [2024-11-09 06:50:47,578 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [107707396] [2024-11-09 06:50:47,578 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-09 06:50:47,579 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2024-11-09 06:50:47,579 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 06:50:47,579 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2024-11-09 06:50:47,580 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=380, Invalid=2070, Unknown=0, NotChecked=0, Total=2450 [2024-11-09 06:50:47,580 INFO L87 Difference]: Start difference. First operand 272 states and 286 transitions. Second operand has 35 states, 35 states have (on average 2.6285714285714286) internal successors, (92), 35 states have internal predecessors, (92), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-09 06:50:48,641 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 06:50:48,641 INFO L93 Difference]: Finished difference Result 501 states and 529 transitions. [2024-11-09 06:50:48,641 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 23 states. [2024-11-09 06:50:48,642 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 35 states have (on average 2.6285714285714286) internal successors, (92), 35 states have internal predecessors, (92), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 146 [2024-11-09 06:50:48,642 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 06:50:48,643 INFO L225 Difference]: With dead ends: 501 [2024-11-09 06:50:48,643 INFO L226 Difference]: Without dead ends: 170 [2024-11-09 06:50:48,644 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 468 GetRequests, 388 SyntacticMatches, 23 SemanticMatches, 57 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1456 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=569, Invalid=2853, Unknown=0, NotChecked=0, Total=3422 [2024-11-09 06:50:48,645 INFO L432 NwaCegarLoop]: 10 mSDtfsCounter, 407 mSDsluCounter, 39 mSDsCounter, 0 mSdLazyCounter, 859 mSolverCounterSat, 446 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 407 SdHoareTripleChecker+Valid, 49 SdHoareTripleChecker+Invalid, 1305 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 446 IncrementalHoareTripleChecker+Valid, 859 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2024-11-09 06:50:48,645 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [407 Valid, 49 Invalid, 1305 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [446 Valid, 859 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2024-11-09 06:50:48,646 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 170 states. [2024-11-09 06:50:48,718 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 170 to 157. [2024-11-09 06:50:48,719 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 157 states, 156 states have (on average 1.044871794871795) internal successors, (163), 156 states have internal predecessors, (163), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-09 06:50:48,719 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 157 states to 157 states and 163 transitions. [2024-11-09 06:50:48,719 INFO L78 Accepts]: Start accepts. Automaton has 157 states and 163 transitions. Word has length 146 [2024-11-09 06:50:48,720 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 06:50:48,720 INFO L471 AbstractCegarLoop]: Abstraction has 157 states and 163 transitions. [2024-11-09 06:50:48,720 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 35 states have (on average 2.6285714285714286) internal successors, (92), 35 states have internal predecessors, (92), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-09 06:50:48,720 INFO L276 IsEmpty]: Start isEmpty. Operand 157 states and 163 transitions. [2024-11-09 06:50:48,720 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 157 [2024-11-09 06:50:48,720 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 06:50:48,721 INFO L215 NwaCegarLoop]: trace histogram [10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 9, 9, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-09 06:50:48,737 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_627c9d95-6587-4b89-802d-015e259dbc56/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (26)] Ended with exit code 0 [2024-11-09 06:50:48,921 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 26 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_627c9d95-6587-4b89-802d-015e259dbc56/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable26 [2024-11-09 06:50:48,921 INFO L396 AbstractCegarLoop]: === Iteration 28 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 06:50:48,921 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 06:50:48,922 INFO L85 PathProgramCache]: Analyzing trace with hash -729365797, now seen corresponding path program 26 times [2024-11-09 06:50:48,922 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 06:50:48,922 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [274848955] [2024-11-09 06:50:48,922 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 06:50:48,922 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 06:50:48,946 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 06:50:49,468 INFO L134 CoverageAnalysis]: Checked inductivity of 681 backedges. 64 proven. 117 refuted. 0 times theorem prover too weak. 500 trivial. 0 not checked. [2024-11-09 06:50:49,468 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 06:50:49,468 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [274848955] [2024-11-09 06:50:49,468 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [274848955] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-09 06:50:49,468 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [784953558] [2024-11-09 06:50:49,468 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2024-11-09 06:50:49,469 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 06:50:49,469 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_627c9d95-6587-4b89-802d-015e259dbc56/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 06:50:49,470 INFO L229 MonitoredProcess]: Starting monitored process 27 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_627c9d95-6587-4b89-802d-015e259dbc56/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 06:50:49,471 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_627c9d95-6587-4b89-802d-015e259dbc56/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Waiting until timeout for monitored process [2024-11-09 06:50:49,740 INFO L227 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 11 check-sat command(s) [2024-11-09 06:50:49,740 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-09 06:50:49,743 INFO L255 TraceCheckSpWp]: Trace formula consists of 503 conjuncts, 28 conjuncts are in the unsatisfiable core [2024-11-09 06:50:49,745 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 06:50:50,157 INFO L134 CoverageAnalysis]: Checked inductivity of 681 backedges. 110 proven. 91 refuted. 0 times theorem prover too weak. 480 trivial. 0 not checked. [2024-11-09 06:50:50,158 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-09 06:50:50,802 INFO L134 CoverageAnalysis]: Checked inductivity of 681 backedges. 100 proven. 91 refuted. 0 times theorem prover too weak. 490 trivial. 0 not checked. [2024-11-09 06:50:50,802 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [784953558] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-09 06:50:50,802 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [189248937] [2024-11-09 06:50:50,804 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2024-11-09 06:50:50,804 INFO L166 IcfgInterpreter]: Building call graph [2024-11-09 06:50:50,804 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-09 06:50:50,804 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-09 06:50:50,804 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-09 06:50:51,631 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-09 06:50:52,678 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '29946#true' at error location [2024-11-09 06:50:52,678 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-09 06:50:52,678 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-09 06:50:52,679 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [23, 25, 24] total 48 [2024-11-09 06:50:52,679 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [43232483] [2024-11-09 06:50:52,679 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-09 06:50:52,679 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 48 states [2024-11-09 06:50:52,680 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 06:50:52,680 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 48 interpolants. [2024-11-09 06:50:52,681 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=711, Invalid=3071, Unknown=0, NotChecked=0, Total=3782 [2024-11-09 06:50:52,681 INFO L87 Difference]: Start difference. First operand 157 states and 163 transitions. Second operand has 48 states, 48 states have (on average 2.9375) internal successors, (141), 48 states have internal predecessors, (141), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-09 06:50:54,227 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 06:50:54,227 INFO L93 Difference]: Finished difference Result 169 states and 175 transitions. [2024-11-09 06:50:54,227 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 32 states. [2024-11-09 06:50:54,227 INFO L78 Accepts]: Start accepts. Automaton has has 48 states, 48 states have (on average 2.9375) internal successors, (141), 48 states have internal predecessors, (141), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 156 [2024-11-09 06:50:54,228 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 06:50:54,229 INFO L225 Difference]: With dead ends: 169 [2024-11-09 06:50:54,229 INFO L226 Difference]: Without dead ends: 165 [2024-11-09 06:50:54,230 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 519 GetRequests, 416 SyntacticMatches, 15 SemanticMatches, 88 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2923 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=1667, Invalid=6343, Unknown=0, NotChecked=0, Total=8010 [2024-11-09 06:50:54,230 INFO L432 NwaCegarLoop]: 10 mSDtfsCounter, 339 mSDsluCounter, 27 mSDsCounter, 0 mSdLazyCounter, 1305 mSolverCounterSat, 358 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 339 SdHoareTripleChecker+Valid, 37 SdHoareTripleChecker+Invalid, 1663 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 358 IncrementalHoareTripleChecker+Valid, 1305 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2024-11-09 06:50:54,231 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [339 Valid, 37 Invalid, 1663 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [358 Valid, 1305 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2024-11-09 06:50:54,231 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 165 states. [2024-11-09 06:50:54,311 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 165 to 159. [2024-11-09 06:50:54,312 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 159 states, 158 states have (on average 1.0443037974683544) internal successors, (165), 158 states have internal predecessors, (165), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-09 06:50:54,312 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 159 states to 159 states and 165 transitions. [2024-11-09 06:50:54,313 INFO L78 Accepts]: Start accepts. Automaton has 159 states and 165 transitions. Word has length 156 [2024-11-09 06:50:54,314 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 06:50:54,314 INFO L471 AbstractCegarLoop]: Abstraction has 159 states and 165 transitions. [2024-11-09 06:50:54,314 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 48 states, 48 states have (on average 2.9375) internal successors, (141), 48 states have internal predecessors, (141), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-09 06:50:54,314 INFO L276 IsEmpty]: Start isEmpty. Operand 159 states and 165 transitions. [2024-11-09 06:50:54,315 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 159 [2024-11-09 06:50:54,315 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 06:50:54,315 INFO L215 NwaCegarLoop]: trace histogram [10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-09 06:50:54,336 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_627c9d95-6587-4b89-802d-015e259dbc56/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (27)] Ended with exit code 0 [2024-11-09 06:50:54,516 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 27 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_627c9d95-6587-4b89-802d-015e259dbc56/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable27 [2024-11-09 06:50:54,516 INFO L396 AbstractCegarLoop]: === Iteration 29 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 06:50:54,516 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 06:50:54,516 INFO L85 PathProgramCache]: Analyzing trace with hash -1045110400, now seen corresponding path program 27 times [2024-11-09 06:50:54,516 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 06:50:54,517 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1956829940] [2024-11-09 06:50:54,517 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 06:50:54,517 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 06:50:54,690 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 06:51:21,911 INFO L134 CoverageAnalysis]: Checked inductivity of 700 backedges. 56 proven. 644 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 06:51:21,911 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 06:51:21,911 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1956829940] [2024-11-09 06:51:21,912 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1956829940] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-09 06:51:21,912 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [213779631] [2024-11-09 06:51:21,912 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2024-11-09 06:51:21,912 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 06:51:21,912 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_627c9d95-6587-4b89-802d-015e259dbc56/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 06:51:21,913 INFO L229 MonitoredProcess]: Starting monitored process 28 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_627c9d95-6587-4b89-802d-015e259dbc56/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 06:51:21,914 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_627c9d95-6587-4b89-802d-015e259dbc56/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Waiting until timeout for monitored process [2024-11-09 06:51:22,107 INFO L227 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2024-11-09 06:51:22,107 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-09 06:51:22,113 INFO L255 TraceCheckSpWp]: Trace formula consists of 509 conjuncts, 249 conjuncts are in the unsatisfiable core [2024-11-09 06:51:22,117 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 06:51:22,276 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 1 [2024-11-09 06:51:26,409 INFO L134 CoverageAnalysis]: Checked inductivity of 700 backedges. 0 proven. 600 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2024-11-09 06:51:26,410 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-09 06:51:31,542 INFO L134 CoverageAnalysis]: Checked inductivity of 700 backedges. 0 proven. 600 refuted. 0 times theorem prover too weak. 100 trivial. 0 not checked. [2024-11-09 06:51:31,542 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [213779631] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-09 06:51:31,542 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [43449934] [2024-11-09 06:51:31,543 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2024-11-09 06:51:31,543 INFO L166 IcfgInterpreter]: Building call graph [2024-11-09 06:51:31,544 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-09 06:51:31,544 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-09 06:51:31,544 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-09 06:51:32,516 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-09 06:51:36,694 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '31478#true' at error location [2024-11-09 06:51:36,694 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-09 06:51:36,694 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-09 06:51:36,694 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [82, 26, 25] total 125 [2024-11-09 06:51:36,694 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1747110196] [2024-11-09 06:51:36,694 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-09 06:51:36,695 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 125 states [2024-11-09 06:51:36,695 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 06:51:36,696 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 125 interpolants. [2024-11-09 06:51:36,697 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=701, Invalid=18759, Unknown=0, NotChecked=0, Total=19460 [2024-11-09 06:51:36,698 INFO L87 Difference]: Start difference. First operand 159 states and 165 transitions. Second operand has 125 states, 125 states have (on average 3.44) internal successors, (430), 125 states have internal predecessors, (430), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-09 06:52:13,292 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 06:52:13,292 INFO L93 Difference]: Finished difference Result 465 states and 491 transitions. [2024-11-09 06:52:13,293 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 103 states. [2024-11-09 06:52:13,293 INFO L78 Accepts]: Start accepts. Automaton has has 125 states, 125 states have (on average 3.44) internal successors, (430), 125 states have internal predecessors, (430), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 158 [2024-11-09 06:52:13,293 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 06:52:13,295 INFO L225 Difference]: With dead ends: 465 [2024-11-09 06:52:13,295 INFO L226 Difference]: Without dead ends: 459 [2024-11-09 06:52:13,298 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 649 GetRequests, 414 SyntacticMatches, 5 SemanticMatches, 230 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 12135 ImplicationChecksByTransitivity, 41.2s TimeCoverageRelationStatistics Valid=3761, Invalid=49831, Unknown=0, NotChecked=0, Total=53592 [2024-11-09 06:52:13,298 INFO L432 NwaCegarLoop]: 16 mSDtfsCounter, 1455 mSDsluCounter, 295 mSDsCounter, 0 mSdLazyCounter, 14861 mSolverCounterSat, 1494 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 12.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1455 SdHoareTripleChecker+Valid, 311 SdHoareTripleChecker+Invalid, 16355 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 1494 IncrementalHoareTripleChecker+Valid, 14861 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 14.0s IncrementalHoareTripleChecker+Time [2024-11-09 06:52:13,299 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [1455 Valid, 311 Invalid, 16355 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [1494 Valid, 14861 Invalid, 0 Unknown, 0 Unchecked, 14.0s Time] [2024-11-09 06:52:13,299 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 459 states. [2024-11-09 06:52:13,406 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 459 to 298. [2024-11-09 06:52:13,406 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 298 states, 297 states have (on average 1.0505050505050506) internal successors, (312), 297 states have internal predecessors, (312), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-09 06:52:13,407 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 298 states to 298 states and 312 transitions. [2024-11-09 06:52:13,408 INFO L78 Accepts]: Start accepts. Automaton has 298 states and 312 transitions. Word has length 158 [2024-11-09 06:52:13,408 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 06:52:13,408 INFO L471 AbstractCegarLoop]: Abstraction has 298 states and 312 transitions. [2024-11-09 06:52:13,408 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 125 states, 125 states have (on average 3.44) internal successors, (430), 125 states have internal predecessors, (430), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-09 06:52:13,408 INFO L276 IsEmpty]: Start isEmpty. Operand 298 states and 312 transitions. [2024-11-09 06:52:13,409 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 161 [2024-11-09 06:52:13,409 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 06:52:13,409 INFO L215 NwaCegarLoop]: trace histogram [11, 11, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-09 06:52:13,423 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_627c9d95-6587-4b89-802d-015e259dbc56/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (28)] Ended with exit code 0 [2024-11-09 06:52:13,610 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 28 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_627c9d95-6587-4b89-802d-015e259dbc56/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable28 [2024-11-09 06:52:13,610 INFO L396 AbstractCegarLoop]: === Iteration 30 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 06:52:13,610 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 06:52:13,610 INFO L85 PathProgramCache]: Analyzing trace with hash -1257528987, now seen corresponding path program 28 times [2024-11-09 06:52:13,610 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 06:52:13,611 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1185537206] [2024-11-09 06:52:13,611 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 06:52:13,611 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 06:52:13,641 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 06:52:14,059 INFO L134 CoverageAnalysis]: Checked inductivity of 721 backedges. 102 proven. 119 refuted. 0 times theorem prover too weak. 500 trivial. 0 not checked. [2024-11-09 06:52:14,059 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 06:52:14,059 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1185537206] [2024-11-09 06:52:14,059 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1185537206] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-09 06:52:14,059 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [777692961] [2024-11-09 06:52:14,059 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2024-11-09 06:52:14,060 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 06:52:14,060 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_627c9d95-6587-4b89-802d-015e259dbc56/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 06:52:14,061 INFO L229 MonitoredProcess]: Starting monitored process 29 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_627c9d95-6587-4b89-802d-015e259dbc56/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 06:52:14,062 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_627c9d95-6587-4b89-802d-015e259dbc56/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Waiting until timeout for monitored process [2024-11-09 06:52:14,234 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 06:52:14,237 INFO L255 TraceCheckSpWp]: Trace formula consists of 515 conjuncts, 24 conjuncts are in the unsatisfiable core [2024-11-09 06:52:14,240 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 06:52:14,697 INFO L134 CoverageAnalysis]: Checked inductivity of 721 backedges. 121 proven. 100 refuted. 0 times theorem prover too weak. 500 trivial. 0 not checked. [2024-11-09 06:52:14,698 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-09 06:52:14,976 INFO L134 CoverageAnalysis]: Checked inductivity of 721 backedges. 121 proven. 100 refuted. 0 times theorem prover too weak. 500 trivial. 0 not checked. [2024-11-09 06:52:14,976 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [777692961] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-09 06:52:14,976 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1411031406] [2024-11-09 06:52:14,977 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2024-11-09 06:52:14,977 INFO L166 IcfgInterpreter]: Building call graph [2024-11-09 06:52:14,977 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-09 06:52:14,977 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-09 06:52:14,977 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-09 06:52:15,898 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-09 06:52:17,018 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '33872#true' at error location [2024-11-09 06:52:17,018 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-09 06:52:17,018 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-09 06:52:17,018 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 25] total 38 [2024-11-09 06:52:17,018 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [129834252] [2024-11-09 06:52:17,018 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-09 06:52:17,019 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 38 states [2024-11-09 06:52:17,019 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 06:52:17,019 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2024-11-09 06:52:17,020 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=431, Invalid=2325, Unknown=0, NotChecked=0, Total=2756 [2024-11-09 06:52:17,020 INFO L87 Difference]: Start difference. First operand 298 states and 312 transitions. Second operand has 38 states, 38 states have (on average 2.5789473684210527) internal successors, (98), 38 states have internal predecessors, (98), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-09 06:52:18,143 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 06:52:18,143 INFO L93 Difference]: Finished difference Result 547 states and 575 transitions. [2024-11-09 06:52:18,144 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 25 states. [2024-11-09 06:52:18,144 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 38 states have (on average 2.5789473684210527) internal successors, (98), 38 states have internal predecessors, (98), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 160 [2024-11-09 06:52:18,144 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 06:52:18,145 INFO L225 Difference]: With dead ends: 547 [2024-11-09 06:52:18,145 INFO L226 Difference]: Without dead ends: 184 [2024-11-09 06:52:18,146 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 513 GetRequests, 427 SyntacticMatches, 25 SemanticMatches, 61 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1678 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=656, Invalid=3250, Unknown=0, NotChecked=0, Total=3906 [2024-11-09 06:52:18,147 INFO L432 NwaCegarLoop]: 10 mSDtfsCounter, 467 mSDsluCounter, 39 mSDsCounter, 0 mSdLazyCounter, 928 mSolverCounterSat, 489 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 467 SdHoareTripleChecker+Valid, 49 SdHoareTripleChecker+Invalid, 1417 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 489 IncrementalHoareTripleChecker+Valid, 928 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2024-11-09 06:52:18,147 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [467 Valid, 49 Invalid, 1417 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [489 Valid, 928 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2024-11-09 06:52:18,147 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 184 states. [2024-11-09 06:52:18,210 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 184 to 171. [2024-11-09 06:52:18,210 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 171 states, 170 states have (on average 1.0411764705882354) internal successors, (177), 170 states have internal predecessors, (177), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-09 06:52:18,211 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 171 states to 171 states and 177 transitions. [2024-11-09 06:52:18,211 INFO L78 Accepts]: Start accepts. Automaton has 171 states and 177 transitions. Word has length 160 [2024-11-09 06:52:18,211 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 06:52:18,211 INFO L471 AbstractCegarLoop]: Abstraction has 171 states and 177 transitions. [2024-11-09 06:52:18,212 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 38 states, 38 states have (on average 2.5789473684210527) internal successors, (98), 38 states have internal predecessors, (98), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-09 06:52:18,212 INFO L276 IsEmpty]: Start isEmpty. Operand 171 states and 177 transitions. [2024-11-09 06:52:18,212 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 171 [2024-11-09 06:52:18,212 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 06:52:18,212 INFO L215 NwaCegarLoop]: trace histogram [11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 10, 10, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-09 06:52:18,227 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_627c9d95-6587-4b89-802d-015e259dbc56/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (29)] Forceful destruction successful, exit code 0 [2024-11-09 06:52:18,413 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable29,29 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_627c9d95-6587-4b89-802d-015e259dbc56/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 06:52:18,413 INFO L396 AbstractCegarLoop]: === Iteration 31 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 06:52:18,413 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 06:52:18,413 INFO L85 PathProgramCache]: Analyzing trace with hash 357823806, now seen corresponding path program 29 times [2024-11-09 06:52:18,413 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 06:52:18,413 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [676607693] [2024-11-09 06:52:18,413 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 06:52:18,414 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 06:52:18,442 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 06:52:18,982 INFO L134 CoverageAnalysis]: Checked inductivity of 826 backedges. 81 proven. 140 refuted. 0 times theorem prover too weak. 605 trivial. 0 not checked. [2024-11-09 06:52:18,982 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 06:52:18,982 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [676607693] [2024-11-09 06:52:18,982 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [676607693] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-09 06:52:18,982 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1752181181] [2024-11-09 06:52:18,982 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2024-11-09 06:52:18,983 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 06:52:18,983 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_627c9d95-6587-4b89-802d-015e259dbc56/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 06:52:18,984 INFO L229 MonitoredProcess]: Starting monitored process 30 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_627c9d95-6587-4b89-802d-015e259dbc56/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 06:52:18,985 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_627c9d95-6587-4b89-802d-015e259dbc56/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Waiting until timeout for monitored process [2024-11-09 06:52:19,414 INFO L227 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 12 check-sat command(s) [2024-11-09 06:52:19,414 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-09 06:52:19,418 INFO L255 TraceCheckSpWp]: Trace formula consists of 547 conjuncts, 24 conjuncts are in the unsatisfiable core [2024-11-09 06:52:19,420 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 06:52:19,892 INFO L134 CoverageAnalysis]: Checked inductivity of 826 backedges. 110 proven. 111 refuted. 0 times theorem prover too weak. 605 trivial. 0 not checked. [2024-11-09 06:52:19,892 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-09 06:52:20,360 INFO L134 CoverageAnalysis]: Checked inductivity of 826 backedges. 110 proven. 111 refuted. 0 times theorem prover too weak. 605 trivial. 0 not checked. [2024-11-09 06:52:20,360 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1752181181] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-09 06:52:20,360 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1219001521] [2024-11-09 06:52:20,362 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2024-11-09 06:52:20,362 INFO L166 IcfgInterpreter]: Building call graph [2024-11-09 06:52:20,362 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-09 06:52:20,362 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-09 06:52:20,362 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-09 06:52:21,352 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-09 06:52:22,365 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '35963#true' at error location [2024-11-09 06:52:22,365 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-09 06:52:22,365 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-09 06:52:22,366 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 25, 25] total 38 [2024-11-09 06:52:22,366 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [888962842] [2024-11-09 06:52:22,366 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-09 06:52:22,366 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 38 states [2024-11-09 06:52:22,367 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 06:52:22,367 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 38 interpolants. [2024-11-09 06:52:22,367 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=433, Invalid=2219, Unknown=0, NotChecked=0, Total=2652 [2024-11-09 06:52:22,368 INFO L87 Difference]: Start difference. First operand 171 states and 177 transitions. Second operand has 38 states, 38 states have (on average 3.210526315789474) internal successors, (122), 38 states have internal predecessors, (122), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-09 06:52:23,716 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 06:52:23,716 INFO L93 Difference]: Finished difference Result 183 states and 189 transitions. [2024-11-09 06:52:23,717 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2024-11-09 06:52:23,717 INFO L78 Accepts]: Start accepts. Automaton has has 38 states, 38 states have (on average 3.210526315789474) internal successors, (122), 38 states have internal predecessors, (122), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 170 [2024-11-09 06:52:23,718 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 06:52:23,718 INFO L225 Difference]: With dead ends: 183 [2024-11-09 06:52:23,718 INFO L226 Difference]: Without dead ends: 179 [2024-11-09 06:52:23,719 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 557 GetRequests, 459 SyntacticMatches, 26 SemanticMatches, 72 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2241 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=984, Invalid=4418, Unknown=0, NotChecked=0, Total=5402 [2024-11-09 06:52:23,720 INFO L432 NwaCegarLoop]: 10 mSDtfsCounter, 384 mSDsluCounter, 24 mSDsCounter, 0 mSdLazyCounter, 1099 mSolverCounterSat, 410 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 384 SdHoareTripleChecker+Valid, 34 SdHoareTripleChecker+Invalid, 1509 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 410 IncrementalHoareTripleChecker+Valid, 1099 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2024-11-09 06:52:23,720 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [384 Valid, 34 Invalid, 1509 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [410 Valid, 1099 Invalid, 0 Unknown, 0 Unchecked, 0.7s Time] [2024-11-09 06:52:23,720 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 179 states. [2024-11-09 06:52:23,778 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 179 to 173. [2024-11-09 06:52:23,778 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 173 states, 172 states have (on average 1.0406976744186047) internal successors, (179), 172 states have internal predecessors, (179), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-09 06:52:23,779 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 173 states to 173 states and 179 transitions. [2024-11-09 06:52:23,779 INFO L78 Accepts]: Start accepts. Automaton has 173 states and 179 transitions. Word has length 170 [2024-11-09 06:52:23,780 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 06:52:23,780 INFO L471 AbstractCegarLoop]: Abstraction has 173 states and 179 transitions. [2024-11-09 06:52:23,780 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 38 states, 38 states have (on average 3.210526315789474) internal successors, (122), 38 states have internal predecessors, (122), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-09 06:52:23,780 INFO L276 IsEmpty]: Start isEmpty. Operand 173 states and 179 transitions. [2024-11-09 06:52:23,780 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 173 [2024-11-09 06:52:23,780 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 06:52:23,781 INFO L215 NwaCegarLoop]: trace histogram [11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-09 06:52:23,794 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_627c9d95-6587-4b89-802d-015e259dbc56/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (30)] Forceful destruction successful, exit code 0 [2024-11-09 06:52:23,981 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable30,30 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_627c9d95-6587-4b89-802d-015e259dbc56/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 06:52:23,981 INFO L396 AbstractCegarLoop]: === Iteration 32 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 06:52:23,981 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 06:52:23,982 INFO L85 PathProgramCache]: Analyzing trace with hash 67045155, now seen corresponding path program 30 times [2024-11-09 06:52:23,982 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 06:52:23,982 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1503577112] [2024-11-09 06:52:23,982 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 06:52:23,982 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 06:52:24,213 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 06:52:56,879 INFO L134 CoverageAnalysis]: Checked inductivity of 847 backedges. 81 proven. 766 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 06:52:56,879 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 06:52:56,879 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1503577112] [2024-11-09 06:52:56,879 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1503577112] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-09 06:52:56,879 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [762016402] [2024-11-09 06:52:56,879 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2024-11-09 06:52:56,880 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 06:52:56,880 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_627c9d95-6587-4b89-802d-015e259dbc56/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 06:52:56,881 INFO L229 MonitoredProcess]: Starting monitored process 31 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_627c9d95-6587-4b89-802d-015e259dbc56/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 06:52:56,882 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_627c9d95-6587-4b89-802d-015e259dbc56/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Waiting until timeout for monitored process [2024-11-09 06:52:57,091 INFO L227 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2024-11-09 06:52:57,092 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-09 06:52:57,097 INFO L255 TraceCheckSpWp]: Trace formula consists of 553 conjuncts, 276 conjuncts are in the unsatisfiable core [2024-11-09 06:52:57,102 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 06:52:57,268 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 1 [2024-11-09 06:53:01,739 INFO L134 CoverageAnalysis]: Checked inductivity of 847 backedges. 0 proven. 726 refuted. 0 times theorem prover too weak. 121 trivial. 0 not checked. [2024-11-09 06:53:01,739 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-09 06:53:07,699 INFO L134 CoverageAnalysis]: Checked inductivity of 847 backedges. 0 proven. 726 refuted. 0 times theorem prover too weak. 121 trivial. 0 not checked. [2024-11-09 06:53:07,699 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [762016402] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-09 06:53:07,699 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1060082092] [2024-11-09 06:53:07,700 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2024-11-09 06:53:07,701 INFO L166 IcfgInterpreter]: Building call graph [2024-11-09 06:53:07,701 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-09 06:53:07,701 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-09 06:53:07,701 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-09 06:53:08,463 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-09 06:53:12,244 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '37599#true' at error location [2024-11-09 06:53:12,244 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-09 06:53:12,244 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-09 06:53:12,244 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [89, 28, 27] total 136 [2024-11-09 06:53:12,244 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1098156213] [2024-11-09 06:53:12,244 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-09 06:53:12,245 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 136 states [2024-11-09 06:53:12,245 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 06:53:12,246 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 136 interpolants. [2024-11-09 06:53:12,247 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=791, Invalid=21859, Unknown=0, NotChecked=0, Total=22650 [2024-11-09 06:53:12,247 INFO L87 Difference]: Start difference. First operand 173 states and 179 transitions. Second operand has 136 states, 136 states have (on average 3.4411764705882355) internal successors, (468), 136 states have internal predecessors, (468), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-09 06:53:51,255 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 06:53:51,255 INFO L93 Difference]: Finished difference Result 503 states and 529 transitions. [2024-11-09 06:53:51,256 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 111 states. [2024-11-09 06:53:51,256 INFO L78 Accepts]: Start accepts. Automaton has has 136 states, 136 states have (on average 3.4411764705882355) internal successors, (468), 136 states have internal predecessors, (468), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 172 [2024-11-09 06:53:51,256 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 06:53:51,258 INFO L225 Difference]: With dead ends: 503 [2024-11-09 06:53:51,258 INFO L226 Difference]: Without dead ends: 497 [2024-11-09 06:53:51,261 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 708 GetRequests, 453 SyntacticMatches, 4 SemanticMatches, 251 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 15698 ImplicationChecksByTransitivity, 43.8s TimeCoverageRelationStatistics Valid=4387, Invalid=59369, Unknown=0, NotChecked=0, Total=63756 [2024-11-09 06:53:51,262 INFO L432 NwaCegarLoop]: 16 mSDtfsCounter, 1570 mSDsluCounter, 363 mSDsCounter, 0 mSdLazyCounter, 18557 mSolverCounterSat, 1595 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 13.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1570 SdHoareTripleChecker+Valid, 379 SdHoareTripleChecker+Invalid, 20152 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 1595 IncrementalHoareTripleChecker+Valid, 18557 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 15.5s IncrementalHoareTripleChecker+Time [2024-11-09 06:53:51,262 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [1570 Valid, 379 Invalid, 20152 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [1595 Valid, 18557 Invalid, 0 Unknown, 0 Unchecked, 15.5s Time] [2024-11-09 06:53:51,263 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 497 states. [2024-11-09 06:53:51,397 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 497 to 324. [2024-11-09 06:53:51,398 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 324 states, 323 states have (on average 1.0464396284829722) internal successors, (338), 323 states have internal predecessors, (338), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-09 06:53:51,398 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 324 states to 324 states and 338 transitions. [2024-11-09 06:53:51,399 INFO L78 Accepts]: Start accepts. Automaton has 324 states and 338 transitions. Word has length 172 [2024-11-09 06:53:51,400 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 06:53:51,400 INFO L471 AbstractCegarLoop]: Abstraction has 324 states and 338 transitions. [2024-11-09 06:53:51,400 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 136 states, 136 states have (on average 3.4411764705882355) internal successors, (468), 136 states have internal predecessors, (468), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-09 06:53:51,401 INFO L276 IsEmpty]: Start isEmpty. Operand 324 states and 338 transitions. [2024-11-09 06:53:51,402 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 175 [2024-11-09 06:53:51,402 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 06:53:51,402 INFO L215 NwaCegarLoop]: trace histogram [12, 12, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-09 06:53:51,425 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_627c9d95-6587-4b89-802d-015e259dbc56/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (31)] Ended with exit code 0 [2024-11-09 06:53:51,602 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable31,31 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_627c9d95-6587-4b89-802d-015e259dbc56/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 06:53:51,603 INFO L396 AbstractCegarLoop]: === Iteration 33 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 06:53:51,603 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 06:53:51,603 INFO L85 PathProgramCache]: Analyzing trace with hash -330573240, now seen corresponding path program 31 times [2024-11-09 06:53:51,603 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 06:53:51,603 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1358525996] [2024-11-09 06:53:51,603 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 06:53:51,603 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 06:53:51,632 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 06:53:52,127 INFO L134 CoverageAnalysis]: Checked inductivity of 870 backedges. 123 proven. 142 refuted. 0 times theorem prover too weak. 605 trivial. 0 not checked. [2024-11-09 06:53:52,127 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 06:53:52,128 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1358525996] [2024-11-09 06:53:52,128 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1358525996] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-09 06:53:52,128 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [981083476] [2024-11-09 06:53:52,128 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2024-11-09 06:53:52,128 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 06:53:52,128 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_627c9d95-6587-4b89-802d-015e259dbc56/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 06:53:52,130 INFO L229 MonitoredProcess]: Starting monitored process 32 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_627c9d95-6587-4b89-802d-015e259dbc56/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 06:53:52,131 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_627c9d95-6587-4b89-802d-015e259dbc56/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Waiting until timeout for monitored process [2024-11-09 06:53:52,304 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 06:53:52,307 INFO L255 TraceCheckSpWp]: Trace formula consists of 559 conjuncts, 26 conjuncts are in the unsatisfiable core [2024-11-09 06:53:52,309 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 06:53:52,781 INFO L134 CoverageAnalysis]: Checked inductivity of 870 backedges. 144 proven. 121 refuted. 0 times theorem prover too weak. 605 trivial. 0 not checked. [2024-11-09 06:53:52,781 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-09 06:53:53,140 INFO L134 CoverageAnalysis]: Checked inductivity of 870 backedges. 144 proven. 121 refuted. 0 times theorem prover too weak. 605 trivial. 0 not checked. [2024-11-09 06:53:53,141 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [981083476] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-09 06:53:53,141 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [398365717] [2024-11-09 06:53:53,142 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2024-11-09 06:53:53,142 INFO L166 IcfgInterpreter]: Building call graph [2024-11-09 06:53:53,142 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-09 06:53:53,142 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-09 06:53:53,142 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-09 06:53:53,949 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-09 06:53:55,037 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '40204#true' at error location [2024-11-09 06:53:55,037 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-09 06:53:55,037 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-09 06:53:55,037 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27, 27] total 41 [2024-11-09 06:53:55,037 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1219074665] [2024-11-09 06:53:55,037 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-09 06:53:55,038 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 41 states [2024-11-09 06:53:55,038 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 06:53:55,038 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2024-11-09 06:53:55,039 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=486, Invalid=2594, Unknown=0, NotChecked=0, Total=3080 [2024-11-09 06:53:55,039 INFO L87 Difference]: Start difference. First operand 324 states and 338 transitions. Second operand has 41 states, 41 states have (on average 2.5365853658536586) internal successors, (104), 41 states have internal predecessors, (104), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-09 06:53:56,284 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 06:53:56,284 INFO L93 Difference]: Finished difference Result 593 states and 621 transitions. [2024-11-09 06:53:56,284 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 27 states. [2024-11-09 06:53:56,284 INFO L78 Accepts]: Start accepts. Automaton has has 41 states, 41 states have (on average 2.5365853658536586) internal successors, (104), 41 states have internal predecessors, (104), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 174 [2024-11-09 06:53:56,285 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 06:53:56,286 INFO L225 Difference]: With dead ends: 593 [2024-11-09 06:53:56,286 INFO L226 Difference]: Without dead ends: 198 [2024-11-09 06:53:56,287 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 558 GetRequests, 466 SyntacticMatches, 27 SemanticMatches, 65 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1915 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=750, Invalid=3672, Unknown=0, NotChecked=0, Total=4422 [2024-11-09 06:53:56,287 INFO L432 NwaCegarLoop]: 10 mSDtfsCounter, 544 mSDsluCounter, 24 mSDsCounter, 0 mSdLazyCounter, 1071 mSolverCounterSat, 573 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 544 SdHoareTripleChecker+Valid, 34 SdHoareTripleChecker+Invalid, 1644 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 573 IncrementalHoareTripleChecker+Valid, 1071 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2024-11-09 06:53:56,288 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [544 Valid, 34 Invalid, 1644 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [573 Valid, 1071 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2024-11-09 06:53:56,288 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 198 states. [2024-11-09 06:53:56,354 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 198 to 185. [2024-11-09 06:53:56,354 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 185 states, 184 states have (on average 1.0380434782608696) internal successors, (191), 184 states have internal predecessors, (191), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-09 06:53:56,355 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 185 states to 185 states and 191 transitions. [2024-11-09 06:53:56,356 INFO L78 Accepts]: Start accepts. Automaton has 185 states and 191 transitions. Word has length 174 [2024-11-09 06:53:56,356 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 06:53:56,356 INFO L471 AbstractCegarLoop]: Abstraction has 185 states and 191 transitions. [2024-11-09 06:53:56,356 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 41 states, 41 states have (on average 2.5365853658536586) internal successors, (104), 41 states have internal predecessors, (104), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-09 06:53:56,356 INFO L276 IsEmpty]: Start isEmpty. Operand 185 states and 191 transitions. [2024-11-09 06:53:56,357 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 185 [2024-11-09 06:53:56,357 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 06:53:56,358 INFO L215 NwaCegarLoop]: trace histogram [12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 11, 11, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-09 06:53:56,376 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_627c9d95-6587-4b89-802d-015e259dbc56/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (32)] Forceful destruction successful, exit code 0 [2024-11-09 06:53:56,558 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable32,32 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_627c9d95-6587-4b89-802d-015e259dbc56/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 06:53:56,558 INFO L396 AbstractCegarLoop]: === Iteration 34 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 06:53:56,559 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 06:53:56,559 INFO L85 PathProgramCache]: Analyzing trace with hash -1159135647, now seen corresponding path program 32 times [2024-11-09 06:53:56,559 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 06:53:56,559 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1621695451] [2024-11-09 06:53:56,559 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 06:53:56,559 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 06:53:56,590 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 06:53:57,128 INFO L134 CoverageAnalysis]: Checked inductivity of 985 backedges. 100 proven. 165 refuted. 0 times theorem prover too weak. 720 trivial. 0 not checked. [2024-11-09 06:53:57,128 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 06:53:57,128 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1621695451] [2024-11-09 06:53:57,128 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1621695451] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-09 06:53:57,128 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [70338512] [2024-11-09 06:53:57,128 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2024-11-09 06:53:57,128 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 06:53:57,129 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_627c9d95-6587-4b89-802d-015e259dbc56/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 06:53:57,130 INFO L229 MonitoredProcess]: Starting monitored process 33 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_627c9d95-6587-4b89-802d-015e259dbc56/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 06:53:57,130 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_627c9d95-6587-4b89-802d-015e259dbc56/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Waiting until timeout for monitored process [2024-11-09 06:53:57,503 INFO L227 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 13 check-sat command(s) [2024-11-09 06:53:57,503 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-09 06:53:57,507 INFO L255 TraceCheckSpWp]: Trace formula consists of 591 conjuncts, 26 conjuncts are in the unsatisfiable core [2024-11-09 06:53:57,509 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 06:53:57,934 INFO L134 CoverageAnalysis]: Checked inductivity of 985 backedges. 132 proven. 133 refuted. 0 times theorem prover too weak. 720 trivial. 0 not checked. [2024-11-09 06:53:57,935 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-09 06:53:58,344 INFO L134 CoverageAnalysis]: Checked inductivity of 985 backedges. 132 proven. 133 refuted. 0 times theorem prover too weak. 720 trivial. 0 not checked. [2024-11-09 06:53:58,345 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [70338512] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-09 06:53:58,345 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [59985522] [2024-11-09 06:53:58,346 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2024-11-09 06:53:58,346 INFO L166 IcfgInterpreter]: Building call graph [2024-11-09 06:53:58,346 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-09 06:53:58,346 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-09 06:53:58,346 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-09 06:53:59,142 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-09 06:54:00,030 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '42474#true' at error location [2024-11-09 06:54:00,030 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-09 06:54:00,030 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-09 06:54:00,031 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [27, 27, 27] total 41 [2024-11-09 06:54:00,031 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1467032782] [2024-11-09 06:54:00,031 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-09 06:54:00,031 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 41 states [2024-11-09 06:54:00,031 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 06:54:00,032 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 41 interpolants. [2024-11-09 06:54:00,032 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=488, Invalid=2482, Unknown=0, NotChecked=0, Total=2970 [2024-11-09 06:54:00,033 INFO L87 Difference]: Start difference. First operand 185 states and 191 transitions. Second operand has 41 states, 41 states have (on average 3.268292682926829) internal successors, (134), 41 states have internal predecessors, (134), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-09 06:54:01,436 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 06:54:01,436 INFO L93 Difference]: Finished difference Result 197 states and 203 transitions. [2024-11-09 06:54:01,436 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 38 states. [2024-11-09 06:54:01,436 INFO L78 Accepts]: Start accepts. Automaton has has 41 states, 41 states have (on average 3.268292682926829) internal successors, (134), 41 states have internal predecessors, (134), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 184 [2024-11-09 06:54:01,437 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 06:54:01,437 INFO L225 Difference]: With dead ends: 197 [2024-11-09 06:54:01,438 INFO L226 Difference]: Without dead ends: 193 [2024-11-09 06:54:01,438 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 614 GetRequests, 509 SyntacticMatches, 28 SemanticMatches, 77 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2572 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=1125, Invalid=5037, Unknown=0, NotChecked=0, Total=6162 [2024-11-09 06:54:01,439 INFO L432 NwaCegarLoop]: 10 mSDtfsCounter, 406 mSDsluCounter, 15 mSDsCounter, 0 mSdLazyCounter, 1365 mSolverCounterSat, 429 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 406 SdHoareTripleChecker+Valid, 25 SdHoareTripleChecker+Invalid, 1794 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 429 IncrementalHoareTripleChecker+Valid, 1365 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2024-11-09 06:54:01,439 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [406 Valid, 25 Invalid, 1794 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [429 Valid, 1365 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2024-11-09 06:54:01,439 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 193 states. [2024-11-09 06:54:01,516 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 193 to 187. [2024-11-09 06:54:01,517 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 187 states, 186 states have (on average 1.0376344086021505) internal successors, (193), 186 states have internal predecessors, (193), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-09 06:54:01,517 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 187 states to 187 states and 193 transitions. [2024-11-09 06:54:01,518 INFO L78 Accepts]: Start accepts. Automaton has 187 states and 193 transitions. Word has length 184 [2024-11-09 06:54:01,518 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 06:54:01,518 INFO L471 AbstractCegarLoop]: Abstraction has 187 states and 193 transitions. [2024-11-09 06:54:01,518 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 41 states, 41 states have (on average 3.268292682926829) internal successors, (134), 41 states have internal predecessors, (134), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-09 06:54:01,518 INFO L276 IsEmpty]: Start isEmpty. Operand 187 states and 193 transitions. [2024-11-09 06:54:01,519 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 187 [2024-11-09 06:54:01,519 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 06:54:01,519 INFO L215 NwaCegarLoop]: trace histogram [12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-09 06:54:01,539 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_627c9d95-6587-4b89-802d-015e259dbc56/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (33)] Forceful destruction successful, exit code 0 [2024-11-09 06:54:01,719 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 33 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_627c9d95-6587-4b89-802d-015e259dbc56/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable33 [2024-11-09 06:54:01,719 INFO L396 AbstractCegarLoop]: === Iteration 35 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 06:54:01,720 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 06:54:01,720 INFO L85 PathProgramCache]: Analyzing trace with hash -1737075834, now seen corresponding path program 33 times [2024-11-09 06:54:01,720 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 06:54:01,720 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1080261723] [2024-11-09 06:54:01,720 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 06:54:01,720 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 06:54:01,979 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 06:54:39,699 INFO L134 CoverageAnalysis]: Checked inductivity of 1008 backedges. 72 proven. 936 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 06:54:39,699 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 06:54:39,700 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1080261723] [2024-11-09 06:54:39,700 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1080261723] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-09 06:54:39,700 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [496735607] [2024-11-09 06:54:39,700 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2024-11-09 06:54:39,700 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 06:54:39,700 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_627c9d95-6587-4b89-802d-015e259dbc56/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 06:54:39,702 INFO L229 MonitoredProcess]: Starting monitored process 34 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_627c9d95-6587-4b89-802d-015e259dbc56/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 06:54:39,705 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_627c9d95-6587-4b89-802d-015e259dbc56/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Waiting until timeout for monitored process [2024-11-09 06:54:39,926 INFO L227 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2024-11-09 06:54:39,926 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-09 06:54:39,932 WARN L253 TraceCheckSpWp]: Trace formula consists of 597 conjuncts, 324 conjuncts are in the unsatisfiable core [2024-11-09 06:54:39,936 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 06:54:46,004 INFO L134 CoverageAnalysis]: Checked inductivity of 1008 backedges. 0 proven. 1007 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2024-11-09 06:54:46,005 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-09 06:54:55,565 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2024-11-09 06:54:55,566 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 24 select indices, 24 select index equivalence classes, 0 disjoint index pairs (out of 276 index pairs), introduced 24 new quantified variables, introduced 276 case distinctions, treesize of input 205 treesize of output 1313 [2024-11-09 06:56:02,874 INFO L134 CoverageAnalysis]: Checked inductivity of 1008 backedges. 0 proven. 864 refuted. 0 times theorem prover too weak. 144 trivial. 0 not checked. [2024-11-09 06:56:02,875 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [496735607] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-09 06:56:02,875 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [51331611] [2024-11-09 06:56:02,876 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2024-11-09 06:56:02,876 INFO L166 IcfgInterpreter]: Building call graph [2024-11-09 06:56:02,876 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-09 06:56:02,876 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-09 06:56:02,876 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-09 06:56:03,621 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-09 06:56:07,611 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '44254#true' at error location [2024-11-09 06:56:07,611 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-09 06:56:07,611 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-09 06:56:07,611 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [96, 40, 30] total 157 [2024-11-09 06:56:07,611 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1440484095] [2024-11-09 06:56:07,611 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-09 06:56:07,612 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 157 states [2024-11-09 06:56:07,612 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 06:56:07,612 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 157 interpolants. [2024-11-09 06:56:07,614 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1270, Invalid=28142, Unknown=0, NotChecked=0, Total=29412 [2024-11-09 06:56:07,614 INFO L87 Difference]: Start difference. First operand 187 states and 193 transitions. Second operand has 157 states, 157 states have (on average 3.337579617834395) internal successors, (524), 157 states have internal predecessors, (524), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-09 06:56:56,155 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 06:56:56,155 INFO L93 Difference]: Finished difference Result 730 states and 763 transitions. [2024-11-09 06:56:56,155 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 175 states. [2024-11-09 06:56:56,156 INFO L78 Accepts]: Start accepts. Automaton has has 157 states, 157 states have (on average 3.337579617834395) internal successors, (524), 157 states have internal predecessors, (524), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 186 [2024-11-09 06:56:56,156 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 06:56:56,158 INFO L225 Difference]: With dead ends: 730 [2024-11-09 06:56:56,158 INFO L226 Difference]: Without dead ends: 671 [2024-11-09 06:56:56,163 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 794 GetRequests, 481 SyntacticMatches, 4 SemanticMatches, 309 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 29526 ImplicationChecksByTransitivity, 55.2s TimeCoverageRelationStatistics Valid=5111, Invalid=91299, Unknown=0, NotChecked=0, Total=96410 [2024-11-09 06:56:56,163 INFO L432 NwaCegarLoop]: 17 mSDtfsCounter, 1191 mSDsluCounter, 293 mSDsCounter, 0 mSdLazyCounter, 17226 mSolverCounterSat, 1380 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 14.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1191 SdHoareTripleChecker+Valid, 310 SdHoareTripleChecker+Invalid, 18606 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.1s SdHoareTripleChecker+Time, 1380 IncrementalHoareTripleChecker+Valid, 17226 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 16.4s IncrementalHoareTripleChecker+Time [2024-11-09 06:56:56,164 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [1191 Valid, 310 Invalid, 18606 Unknown, 0 Unchecked, 0.1s Time], IncrementalHoareTripleChecker [1380 Valid, 17226 Invalid, 0 Unknown, 0 Unchecked, 16.4s Time] [2024-11-09 06:56:56,165 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 671 states. [2024-11-09 06:56:56,321 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 671 to 355. [2024-11-09 06:56:56,321 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 355 states, 354 states have (on average 1.0451977401129944) internal successors, (370), 354 states have internal predecessors, (370), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-09 06:56:56,322 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 355 states to 355 states and 370 transitions. [2024-11-09 06:56:56,323 INFO L78 Accepts]: Start accepts. Automaton has 355 states and 370 transitions. Word has length 186 [2024-11-09 06:56:56,323 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 06:56:56,324 INFO L471 AbstractCegarLoop]: Abstraction has 355 states and 370 transitions. [2024-11-09 06:56:56,324 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 157 states, 157 states have (on average 3.337579617834395) internal successors, (524), 157 states have internal predecessors, (524), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-09 06:56:56,324 INFO L276 IsEmpty]: Start isEmpty. Operand 355 states and 370 transitions. [2024-11-09 06:56:56,325 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 189 [2024-11-09 06:56:56,326 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 06:56:56,326 INFO L215 NwaCegarLoop]: trace histogram [13, 13, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-09 06:56:56,349 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_627c9d95-6587-4b89-802d-015e259dbc56/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (34)] Ended with exit code 0 [2024-11-09 06:56:56,526 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 34 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_627c9d95-6587-4b89-802d-015e259dbc56/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable34 [2024-11-09 06:56:56,526 INFO L396 AbstractCegarLoop]: === Iteration 36 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 06:56:56,527 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 06:56:56,527 INFO L85 PathProgramCache]: Analyzing trace with hash 479627755, now seen corresponding path program 34 times [2024-11-09 06:56:56,527 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 06:56:56,527 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1414680076] [2024-11-09 06:56:56,527 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 06:56:56,527 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 06:56:56,558 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 06:56:57,147 INFO L134 CoverageAnalysis]: Checked inductivity of 1033 backedges. 146 proven. 167 refuted. 0 times theorem prover too weak. 720 trivial. 0 not checked. [2024-11-09 06:56:57,147 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 06:56:57,147 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1414680076] [2024-11-09 06:56:57,147 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1414680076] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-09 06:56:57,147 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1825792307] [2024-11-09 06:56:57,147 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2024-11-09 06:56:57,147 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 06:56:57,147 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_627c9d95-6587-4b89-802d-015e259dbc56/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 06:56:57,148 INFO L229 MonitoredProcess]: Starting monitored process 35 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_627c9d95-6587-4b89-802d-015e259dbc56/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 06:56:57,150 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_627c9d95-6587-4b89-802d-015e259dbc56/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Waiting until timeout for monitored process [2024-11-09 06:56:57,353 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 06:56:57,357 INFO L255 TraceCheckSpWp]: Trace formula consists of 603 conjuncts, 28 conjuncts are in the unsatisfiable core [2024-11-09 06:56:57,360 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 06:56:57,957 INFO L134 CoverageAnalysis]: Checked inductivity of 1033 backedges. 169 proven. 144 refuted. 0 times theorem prover too weak. 720 trivial. 0 not checked. [2024-11-09 06:56:57,958 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-09 06:56:58,333 INFO L134 CoverageAnalysis]: Checked inductivity of 1033 backedges. 169 proven. 144 refuted. 0 times theorem prover too weak. 720 trivial. 0 not checked. [2024-11-09 06:56:58,333 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1825792307] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-09 06:56:58,333 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [897865618] [2024-11-09 06:56:58,334 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2024-11-09 06:56:58,335 INFO L166 IcfgInterpreter]: Building call graph [2024-11-09 06:56:58,335 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-09 06:56:58,335 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-09 06:56:58,335 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-09 06:56:59,125 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-09 06:57:00,270 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '47421#true' at error location [2024-11-09 06:57:00,271 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-09 06:57:00,271 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-09 06:57:00,271 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29, 29] total 44 [2024-11-09 06:57:00,271 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1879527673] [2024-11-09 06:57:00,271 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-09 06:57:00,272 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 44 states [2024-11-09 06:57:00,272 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 06:57:00,272 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2024-11-09 06:57:00,273 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=545, Invalid=2877, Unknown=0, NotChecked=0, Total=3422 [2024-11-09 06:57:00,273 INFO L87 Difference]: Start difference. First operand 355 states and 370 transitions. Second operand has 44 states, 44 states have (on average 2.5) internal successors, (110), 44 states have internal predecessors, (110), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-09 06:57:01,698 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 06:57:01,698 INFO L93 Difference]: Finished difference Result 644 states and 672 transitions. [2024-11-09 06:57:01,698 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 29 states. [2024-11-09 06:57:01,698 INFO L78 Accepts]: Start accepts. Automaton has has 44 states, 44 states have (on average 2.5) internal successors, (110), 44 states have internal predecessors, (110), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 188 [2024-11-09 06:57:01,698 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 06:57:01,700 INFO L225 Difference]: With dead ends: 644 [2024-11-09 06:57:01,700 INFO L226 Difference]: Without dead ends: 212 [2024-11-09 06:57:01,700 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 603 GetRequests, 505 SyntacticMatches, 29 SemanticMatches, 69 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2167 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=851, Invalid=4119, Unknown=0, NotChecked=0, Total=4970 [2024-11-09 06:57:01,701 INFO L432 NwaCegarLoop]: 10 mSDtfsCounter, 614 mSDsluCounter, 30 mSDsCounter, 0 mSdLazyCounter, 1131 mSolverCounterSat, 638 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 614 SdHoareTripleChecker+Valid, 40 SdHoareTripleChecker+Invalid, 1769 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 638 IncrementalHoareTripleChecker+Valid, 1131 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2024-11-09 06:57:01,701 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [614 Valid, 40 Invalid, 1769 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [638 Valid, 1131 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2024-11-09 06:57:01,701 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 212 states. [2024-11-09 06:57:01,789 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 212 to 199. [2024-11-09 06:57:01,790 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 199 states, 198 states have (on average 1.0353535353535352) internal successors, (205), 198 states have internal predecessors, (205), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-09 06:57:01,790 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 199 states to 199 states and 205 transitions. [2024-11-09 06:57:01,791 INFO L78 Accepts]: Start accepts. Automaton has 199 states and 205 transitions. Word has length 188 [2024-11-09 06:57:01,791 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 06:57:01,791 INFO L471 AbstractCegarLoop]: Abstraction has 199 states and 205 transitions. [2024-11-09 06:57:01,791 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 44 states, 44 states have (on average 2.5) internal successors, (110), 44 states have internal predecessors, (110), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-09 06:57:01,791 INFO L276 IsEmpty]: Start isEmpty. Operand 199 states and 205 transitions. [2024-11-09 06:57:01,792 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 199 [2024-11-09 06:57:01,792 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 06:57:01,792 INFO L215 NwaCegarLoop]: trace histogram [13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 12, 12, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-09 06:57:01,808 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_627c9d95-6587-4b89-802d-015e259dbc56/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (35)] Forceful destruction successful, exit code 0 [2024-11-09 06:57:01,992 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable35,35 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_627c9d95-6587-4b89-802d-015e259dbc56/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 06:57:01,992 INFO L396 AbstractCegarLoop]: === Iteration 37 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 06:57:01,993 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 06:57:01,993 INFO L85 PathProgramCache]: Analyzing trace with hash 5180996, now seen corresponding path program 35 times [2024-11-09 06:57:01,993 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 06:57:01,993 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2129351203] [2024-11-09 06:57:01,993 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 06:57:01,993 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 06:57:02,024 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 06:57:02,652 INFO L134 CoverageAnalysis]: Checked inductivity of 1158 backedges. 121 proven. 192 refuted. 0 times theorem prover too weak. 845 trivial. 0 not checked. [2024-11-09 06:57:02,652 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 06:57:02,652 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2129351203] [2024-11-09 06:57:02,652 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2129351203] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-09 06:57:02,652 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [137522132] [2024-11-09 06:57:02,652 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2024-11-09 06:57:02,653 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 06:57:02,653 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_627c9d95-6587-4b89-802d-015e259dbc56/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 06:57:02,654 INFO L229 MonitoredProcess]: Starting monitored process 36 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_627c9d95-6587-4b89-802d-015e259dbc56/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 06:57:02,655 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_627c9d95-6587-4b89-802d-015e259dbc56/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (36)] Waiting until timeout for monitored process [2024-11-09 06:57:03,063 INFO L227 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 14 check-sat command(s) [2024-11-09 06:57:03,063 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-09 06:57:03,067 INFO L255 TraceCheckSpWp]: Trace formula consists of 635 conjuncts, 28 conjuncts are in the unsatisfiable core [2024-11-09 06:57:03,069 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 06:57:03,486 INFO L134 CoverageAnalysis]: Checked inductivity of 1158 backedges. 156 proven. 157 refuted. 0 times theorem prover too weak. 845 trivial. 0 not checked. [2024-11-09 06:57:03,487 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-09 06:57:03,923 INFO L134 CoverageAnalysis]: Checked inductivity of 1158 backedges. 156 proven. 157 refuted. 0 times theorem prover too weak. 845 trivial. 0 not checked. [2024-11-09 06:57:03,924 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [137522132] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-09 06:57:03,924 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [515761511] [2024-11-09 06:57:03,925 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2024-11-09 06:57:03,925 INFO L166 IcfgInterpreter]: Building call graph [2024-11-09 06:57:03,925 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-09 06:57:03,925 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-09 06:57:03,925 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-09 06:57:04,866 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-09 06:57:05,809 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '49877#true' at error location [2024-11-09 06:57:05,809 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-09 06:57:05,809 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-09 06:57:05,810 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [29, 29, 29] total 44 [2024-11-09 06:57:05,810 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [725066995] [2024-11-09 06:57:05,810 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-09 06:57:05,810 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 44 states [2024-11-09 06:57:05,811 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 06:57:05,811 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 44 interpolants. [2024-11-09 06:57:05,811 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=547, Invalid=2759, Unknown=0, NotChecked=0, Total=3306 [2024-11-09 06:57:05,811 INFO L87 Difference]: Start difference. First operand 199 states and 205 transitions. Second operand has 44 states, 44 states have (on average 3.3181818181818183) internal successors, (146), 44 states have internal predecessors, (146), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-09 06:57:07,432 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-09 06:57:07,432 INFO L93 Difference]: Finished difference Result 211 states and 217 transitions. [2024-11-09 06:57:07,432 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 41 states. [2024-11-09 06:57:07,432 INFO L78 Accepts]: Start accepts. Automaton has has 44 states, 44 states have (on average 3.3181818181818183) internal successors, (146), 44 states have internal predecessors, (146), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 198 [2024-11-09 06:57:07,433 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-09 06:57:07,434 INFO L225 Difference]: With dead ends: 211 [2024-11-09 06:57:07,434 INFO L226 Difference]: Without dead ends: 207 [2024-11-09 06:57:07,434 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 661 GetRequests, 549 SyntacticMatches, 30 SemanticMatches, 82 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2925 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=1276, Invalid=5696, Unknown=0, NotChecked=0, Total=6972 [2024-11-09 06:57:07,435 INFO L432 NwaCegarLoop]: 10 mSDtfsCounter, 389 mSDsluCounter, 27 mSDsCounter, 0 mSdLazyCounter, 1609 mSolverCounterSat, 405 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.8s Time, 0 mProtectedPredicate, 0 mProtectedAction, 389 SdHoareTripleChecker+Valid, 37 SdHoareTripleChecker+Invalid, 2014 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 405 IncrementalHoareTripleChecker+Valid, 1609 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.9s IncrementalHoareTripleChecker+Time [2024-11-09 06:57:07,435 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [389 Valid, 37 Invalid, 2014 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [405 Valid, 1609 Invalid, 0 Unknown, 0 Unchecked, 0.9s Time] [2024-11-09 06:57:07,436 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 207 states. [2024-11-09 06:57:07,527 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 207 to 201. [2024-11-09 06:57:07,527 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 201 states, 200 states have (on average 1.035) internal successors, (207), 200 states have internal predecessors, (207), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-09 06:57:07,527 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 201 states to 201 states and 207 transitions. [2024-11-09 06:57:07,528 INFO L78 Accepts]: Start accepts. Automaton has 201 states and 207 transitions. Word has length 198 [2024-11-09 06:57:07,528 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-09 06:57:07,528 INFO L471 AbstractCegarLoop]: Abstraction has 201 states and 207 transitions. [2024-11-09 06:57:07,528 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 44 states, 44 states have (on average 3.3181818181818183) internal successors, (146), 44 states have internal predecessors, (146), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-09 06:57:07,528 INFO L276 IsEmpty]: Start isEmpty. Operand 201 states and 207 transitions. [2024-11-09 06:57:07,529 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 201 [2024-11-09 06:57:07,529 INFO L207 NwaCegarLoop]: Found error trace [2024-11-09 06:57:07,529 INFO L215 NwaCegarLoop]: trace histogram [13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 13, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-09 06:57:07,544 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_627c9d95-6587-4b89-802d-015e259dbc56/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (36)] Forceful destruction successful, exit code 0 [2024-11-09 06:57:07,729 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable36,36 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_627c9d95-6587-4b89-802d-015e259dbc56/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 06:57:07,730 INFO L396 AbstractCegarLoop]: === Iteration 38 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-09 06:57:07,730 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-09 06:57:07,730 INFO L85 PathProgramCache]: Analyzing trace with hash 479721129, now seen corresponding path program 36 times [2024-11-09 06:57:07,730 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-09 06:57:07,730 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [981116199] [2024-11-09 06:57:07,730 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-09 06:57:07,730 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-09 06:57:08,028 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-09 06:57:51,425 INFO L134 CoverageAnalysis]: Checked inductivity of 1183 backedges. 213 proven. 970 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-09 06:57:51,425 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-09 06:57:51,425 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [981116199] [2024-11-09 06:57:51,425 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [981116199] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-09 06:57:51,425 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1818754008] [2024-11-09 06:57:51,425 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2024-11-09 06:57:51,425 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-09 06:57:51,426 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_627c9d95-6587-4b89-802d-015e259dbc56/bin/utaipan-verify-YMUCfTKeje/z3 [2024-11-09 06:57:51,426 INFO L229 MonitoredProcess]: Starting monitored process 37 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_627c9d95-6587-4b89-802d-015e259dbc56/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-09 06:57:51,427 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_627c9d95-6587-4b89-802d-015e259dbc56/bin/utaipan-verify-YMUCfTKeje/z3 -smt2 -in SMTLIB2_COMPLIANT=true (37)] Waiting until timeout for monitored process [2024-11-09 06:57:51,688 INFO L227 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2024-11-09 06:57:51,688 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-09 06:57:51,694 WARN L253 TraceCheckSpWp]: Trace formula consists of 641 conjuncts, 321 conjuncts are in the unsatisfiable core [2024-11-09 06:57:51,701 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-09 06:57:51,877 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 1 [2024-11-09 06:57:56,950 INFO L134 CoverageAnalysis]: Checked inductivity of 1183 backedges. 0 proven. 1014 refuted. 0 times theorem prover too weak. 169 trivial. 0 not checked. [2024-11-09 06:57:56,951 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-09 06:58:03,208 INFO L134 CoverageAnalysis]: Checked inductivity of 1183 backedges. 0 proven. 1014 refuted. 0 times theorem prover too weak. 169 trivial. 0 not checked. [2024-11-09 06:58:03,208 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1818754008] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-09 06:58:03,208 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1023974080] [2024-11-09 06:58:03,209 INFO L159 IcfgInterpreter]: Started Sifa with 26 locations of interest [2024-11-09 06:58:03,209 INFO L166 IcfgInterpreter]: Building call graph [2024-11-09 06:58:03,210 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-09 06:58:03,210 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-09 06:58:03,210 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-09 06:58:04,010 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-09 06:58:07,882 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '51791#true' at error location [2024-11-09 06:58:07,883 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-09 06:58:07,883 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-09 06:58:07,883 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [102, 32, 31] total 156 [2024-11-09 06:58:07,883 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [186251438] [2024-11-09 06:58:07,883 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-09 06:58:07,884 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 156 states [2024-11-09 06:58:07,884 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-09 06:58:07,885 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 156 interpolants. [2024-11-09 06:58:07,886 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1199, Invalid=27871, Unknown=0, NotChecked=0, Total=29070 [2024-11-09 06:58:07,887 INFO L87 Difference]: Start difference. First operand 201 states and 207 transitions. Second operand has 156 states, 156 states have (on average 3.4743589743589745) internal successors, (542), 156 states have internal predecessors, (542), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0)