./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/array-examples/standard_find_ground-1.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 9bd2c7ff Calling Ultimate with: /usr/lib/jvm/java-1.11.0-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_50d3a1e4-bc54-412b-b462-dcc223315884/bin/utaipan-verify-t7M7D8N6sZ/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_50d3a1e4-bc54-412b-b462-dcc223315884/bin/utaipan-verify-t7M7D8N6sZ/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_50d3a1e4-bc54-412b-b462-dcc223315884/bin/utaipan-verify-t7M7D8N6sZ/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_50d3a1e4-bc54-412b-b462-dcc223315884/bin/utaipan-verify-t7M7D8N6sZ/config/TaipanReach.xml -i ../../sv-benchmarks/c/array-examples/standard_find_ground-1.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_50d3a1e4-bc54-412b-b462-dcc223315884/bin/utaipan-verify-t7M7D8N6sZ/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_50d3a1e4-bc54-412b-b462-dcc223315884/bin/utaipan-verify-t7M7D8N6sZ --witnessprinter.witness.filename witness --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 104899a801011b0e3641a72d1ef00a1787a9f1724318580031d49da34b73c0d4 --- Real Ultimate output --- This is Ultimate 0.2.3-dev-9bd2c7f [2023-11-19 04:15:58,304 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-11-19 04:15:58,399 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_50d3a1e4-bc54-412b-b462-dcc223315884/bin/utaipan-verify-t7M7D8N6sZ/config/svcomp-Reach-32bit-Taipan_Default.epf [2023-11-19 04:15:58,409 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-11-19 04:15:58,411 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-11-19 04:15:58,453 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-11-19 04:15:58,454 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-11-19 04:15:58,455 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-11-19 04:15:58,456 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-11-19 04:15:58,461 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-11-19 04:15:58,462 INFO L153 SettingsManager]: * User list type=DISABLED [2023-11-19 04:15:58,463 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-11-19 04:15:58,464 INFO L153 SettingsManager]: * Explicit value domain=true [2023-11-19 04:15:58,465 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-11-19 04:15:58,466 INFO L153 SettingsManager]: * Octagon Domain=false [2023-11-19 04:15:58,466 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-11-19 04:15:58,467 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-11-19 04:15:58,467 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-11-19 04:15:58,468 INFO L153 SettingsManager]: * Interval Domain=false [2023-11-19 04:15:58,468 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-11-19 04:15:58,469 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-11-19 04:15:58,469 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2023-11-19 04:15:58,470 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-11-19 04:15:58,471 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-11-19 04:15:58,471 INFO L153 SettingsManager]: * sizeof long=4 [2023-11-19 04:15:58,472 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-11-19 04:15:58,472 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-11-19 04:15:58,472 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-11-19 04:15:58,473 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-11-19 04:15:58,473 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-11-19 04:15:58,474 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-11-19 04:15:58,474 INFO L153 SettingsManager]: * sizeof long double=12 [2023-11-19 04:15:58,475 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2023-11-19 04:15:58,475 INFO L153 SettingsManager]: * Use constant arrays=true [2023-11-19 04:15:58,476 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-11-19 04:15:58,476 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-11-19 04:15:58,476 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-19 04:15:58,476 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-11-19 04:15:58,477 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-11-19 04:15:58,477 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2023-11-19 04:15:58,477 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-11-19 04:15:58,478 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-11-19 04:15:58,479 INFO L153 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-11-19 04:15:58,479 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-11-19 04:15:58,480 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-11-19 04:15:58,480 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_50d3a1e4-bc54-412b-b462-dcc223315884/bin/utaipan-verify-t7M7D8N6sZ/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_50d3a1e4-bc54-412b-b462-dcc223315884/bin/utaipan-verify-t7M7D8N6sZ Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 104899a801011b0e3641a72d1ef00a1787a9f1724318580031d49da34b73c0d4 [2023-11-19 04:15:58,835 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-11-19 04:15:58,868 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-11-19 04:15:58,870 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-11-19 04:15:58,872 INFO L270 PluginConnector]: Initializing CDTParser... [2023-11-19 04:15:58,872 INFO L274 PluginConnector]: CDTParser initialized [2023-11-19 04:15:58,875 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_50d3a1e4-bc54-412b-b462-dcc223315884/bin/utaipan-verify-t7M7D8N6sZ/../../sv-benchmarks/c/array-examples/standard_find_ground-1.i [2023-11-19 04:16:02,339 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-11-19 04:16:02,602 INFO L384 CDTParser]: Found 1 translation units. [2023-11-19 04:16:02,603 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_50d3a1e4-bc54-412b-b462-dcc223315884/sv-benchmarks/c/array-examples/standard_find_ground-1.i [2023-11-19 04:16:02,613 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_50d3a1e4-bc54-412b-b462-dcc223315884/bin/utaipan-verify-t7M7D8N6sZ/data/950a23b9b/22aa9f271114443ab153c07127f25808/FLAG2573678c7 [2023-11-19 04:16:02,632 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_50d3a1e4-bc54-412b-b462-dcc223315884/bin/utaipan-verify-t7M7D8N6sZ/data/950a23b9b/22aa9f271114443ab153c07127f25808 [2023-11-19 04:16:02,638 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-11-19 04:16:02,642 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-11-19 04:16:02,648 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-11-19 04:16:02,648 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-11-19 04:16:02,655 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-11-19 04:16:02,658 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.11 04:16:02" (1/1) ... [2023-11-19 04:16:02,659 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@7f53ac26 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 04:16:02, skipping insertion in model container [2023-11-19 04:16:02,660 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.11 04:16:02" (1/1) ... [2023-11-19 04:16:02,707 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-11-19 04:16:02,941 WARN L240 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_50d3a1e4-bc54-412b-b462-dcc223315884/sv-benchmarks/c/array-examples/standard_find_ground-1.i[855,868] [2023-11-19 04:16:02,961 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-19 04:16:02,972 INFO L202 MainTranslator]: Completed pre-run [2023-11-19 04:16:02,996 WARN L240 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_50d3a1e4-bc54-412b-b462-dcc223315884/sv-benchmarks/c/array-examples/standard_find_ground-1.i[855,868] [2023-11-19 04:16:03,010 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-19 04:16:03,029 INFO L206 MainTranslator]: Completed translation [2023-11-19 04:16:03,029 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 04:16:03 WrapperNode [2023-11-19 04:16:03,029 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-11-19 04:16:03,031 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-11-19 04:16:03,032 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-11-19 04:16:03,032 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-11-19 04:16:03,041 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 04:16:03" (1/1) ... [2023-11-19 04:16:03,053 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 04:16:03" (1/1) ... [2023-11-19 04:16:03,077 INFO L138 Inliner]: procedures = 16, calls = 13, calls flagged for inlining = 3, calls inlined = 3, statements flattened = 63 [2023-11-19 04:16:03,078 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-11-19 04:16:03,078 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-11-19 04:16:03,079 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-11-19 04:16:03,079 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-11-19 04:16:03,089 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 04:16:03" (1/1) ... [2023-11-19 04:16:03,089 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 04:16:03" (1/1) ... [2023-11-19 04:16:03,091 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 04:16:03" (1/1) ... [2023-11-19 04:16:03,091 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 04:16:03" (1/1) ... [2023-11-19 04:16:03,097 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 04:16:03" (1/1) ... [2023-11-19 04:16:03,101 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 04:16:03" (1/1) ... [2023-11-19 04:16:03,103 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 04:16:03" (1/1) ... [2023-11-19 04:16:03,104 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 04:16:03" (1/1) ... [2023-11-19 04:16:03,106 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-11-19 04:16:03,107 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-11-19 04:16:03,107 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-11-19 04:16:03,108 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-11-19 04:16:03,109 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 04:16:03" (1/1) ... [2023-11-19 04:16:03,117 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-19 04:16:03,134 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_50d3a1e4-bc54-412b-b462-dcc223315884/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 04:16:03,150 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_50d3a1e4-bc54-412b-b462-dcc223315884/bin/utaipan-verify-t7M7D8N6sZ/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-11-19 04:16:03,174 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_50d3a1e4-bc54-412b-b462-dcc223315884/bin/utaipan-verify-t7M7D8N6sZ/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-11-19 04:16:03,202 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-11-19 04:16:03,202 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-11-19 04:16:03,203 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2023-11-19 04:16:03,203 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-11-19 04:16:03,203 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-11-19 04:16:03,203 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-11-19 04:16:03,203 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-11-19 04:16:03,203 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-11-19 04:16:03,285 INFO L236 CfgBuilder]: Building ICFG [2023-11-19 04:16:03,288 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2023-11-19 04:16:03,490 INFO L277 CfgBuilder]: Performing block encoding [2023-11-19 04:16:03,540 INFO L297 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-11-19 04:16:03,540 INFO L302 CfgBuilder]: Removed 3 assume(true) statements. [2023-11-19 04:16:03,545 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.11 04:16:03 BoogieIcfgContainer [2023-11-19 04:16:03,546 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-11-19 04:16:03,549 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-11-19 04:16:03,550 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-11-19 04:16:03,554 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-11-19 04:16:03,554 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 19.11 04:16:02" (1/3) ... [2023-11-19 04:16:03,555 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@706bd4a7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.11 04:16:03, skipping insertion in model container [2023-11-19 04:16:03,556 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 04:16:03" (2/3) ... [2023-11-19 04:16:03,556 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@706bd4a7 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.11 04:16:03, skipping insertion in model container [2023-11-19 04:16:03,556 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.11 04:16:03" (3/3) ... [2023-11-19 04:16:03,558 INFO L112 eAbstractionObserver]: Analyzing ICFG standard_find_ground-1.i [2023-11-19 04:16:03,582 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-11-19 04:16:03,582 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-11-19 04:16:03,636 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-11-19 04:16:03,644 INFO L357 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopHeads, mDumpOnlyReuseAutomata=false, mLimitTraceHistogram=0, mErrorLocTimeLimit=0, mLimitPathProgramCount=0, mCollectInterpolantStatistics=true, mHeuristicEmptinessCheck=false, mHeuristicEmptinessCheckAStarHeuristic=ZERO, mHeuristicEmptinessCheckAStarHeuristicRandomSeed=1337, mHeuristicEmptinessCheckSmtFeatureScoringMethod=DAGSIZE, mSMTFeatureExtraction=false, mSMTFeatureExtractionDumpPath=., mOverrideInterpolantAutomaton=false, mMcrInterpolantMethod=WP, mPorIndependenceSettings=[Lde.uni_freiburg.informatik.ultimate.lib.tracecheckerutils.partialorder.independence.IndependenceSettings;@311d7ef, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-11-19 04:16:03,645 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-11-19 04:16:03,649 INFO L276 IsEmpty]: Start isEmpty. Operand has 11 states, 9 states have (on average 1.6666666666666667) internal successors, (15), 10 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 04:16:03,656 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2023-11-19 04:16:03,656 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 04:16:03,657 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2023-11-19 04:16:03,658 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 04:16:03,664 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 04:16:03,665 INFO L85 PathProgramCache]: Analyzing trace with hash 1249767943, now seen corresponding path program 1 times [2023-11-19 04:16:03,682 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 04:16:03,683 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1550377042] [2023-11-19 04:16:03,683 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 04:16:03,684 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 04:16:03,824 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 04:16:03,881 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 04:16:03,881 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 04:16:03,882 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1550377042] [2023-11-19 04:16:03,883 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1550377042] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-19 04:16:03,883 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-19 04:16:03,883 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-11-19 04:16:03,885 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [510433296] [2023-11-19 04:16:03,887 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 04:16:03,891 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 2 states [2023-11-19 04:16:03,892 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 04:16:03,922 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 2 interpolants. [2023-11-19 04:16:03,923 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2023-11-19 04:16:03,925 INFO L87 Difference]: Start difference. First operand has 11 states, 9 states have (on average 1.6666666666666667) internal successors, (15), 10 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 2 states, 2 states have (on average 3.5) internal successors, (7), 2 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 04:16:03,959 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 04:16:03,959 INFO L93 Difference]: Finished difference Result 18 states and 23 transitions. [2023-11-19 04:16:03,960 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 2 states. [2023-11-19 04:16:03,962 INFO L78 Accepts]: Start accepts. Automaton has has 2 states, 2 states have (on average 3.5) internal successors, (7), 2 states have internal predecessors, (7), 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 7 [2023-11-19 04:16:03,962 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 04:16:03,970 INFO L225 Difference]: With dead ends: 18 [2023-11-19 04:16:03,970 INFO L226 Difference]: Without dead ends: 10 [2023-11-19 04:16:03,973 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 0 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=1, Invalid=1, Unknown=0, NotChecked=0, Total=2 [2023-11-19 04:16:03,977 INFO L413 NwaCegarLoop]: 7 mSDtfsCounter, 0 mSDsluCounter, 0 mSDsCounter, 0 mSdLazyCounter, 6 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 7 SdHoareTripleChecker+Invalid, 6 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 6 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-19 04:16:03,978 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 7 Invalid, 6 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 6 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-19 04:16:04,023 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 10 states. [2023-11-19 04:16:04,035 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 10 to 10. [2023-11-19 04:16:04,043 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 10 states, 9 states have (on average 1.3333333333333333) internal successors, (12), 9 states have internal predecessors, (12), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 04:16:04,044 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 10 states to 10 states and 12 transitions. [2023-11-19 04:16:04,045 INFO L78 Accepts]: Start accepts. Automaton has 10 states and 12 transitions. Word has length 7 [2023-11-19 04:16:04,046 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 04:16:04,046 INFO L495 AbstractCegarLoop]: Abstraction has 10 states and 12 transitions. [2023-11-19 04:16:04,046 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 2 states, 2 states have (on average 3.5) internal successors, (7), 2 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 04:16:04,047 INFO L276 IsEmpty]: Start isEmpty. Operand 10 states and 12 transitions. [2023-11-19 04:16:04,047 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2023-11-19 04:16:04,047 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 04:16:04,047 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 04:16:04,048 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-11-19 04:16:04,048 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 04:16:04,049 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 04:16:04,049 INFO L85 PathProgramCache]: Analyzing trace with hash 1198855106, now seen corresponding path program 1 times [2023-11-19 04:16:04,049 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 04:16:04,049 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2066242556] [2023-11-19 04:16:04,050 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 04:16:04,050 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 04:16:04,092 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 04:16:04,231 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 04:16:04,231 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 04:16:04,232 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2066242556] [2023-11-19 04:16:04,232 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2066242556] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-19 04:16:04,232 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-19 04:16:04,232 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-11-19 04:16:04,233 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1417192859] [2023-11-19 04:16:04,233 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 04:16:04,234 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-19 04:16:04,235 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 04:16:04,235 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-19 04:16:04,236 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-19 04:16:04,236 INFO L87 Difference]: Start difference. First operand 10 states and 12 transitions. Second operand has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 2 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 04:16:04,275 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 04:16:04,276 INFO L93 Difference]: Finished difference Result 19 states and 23 transitions. [2023-11-19 04:16:04,276 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-19 04:16:04,277 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 2 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 8 [2023-11-19 04:16:04,277 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 04:16:04,277 INFO L225 Difference]: With dead ends: 19 [2023-11-19 04:16:04,278 INFO L226 Difference]: Without dead ends: 11 [2023-11-19 04:16:04,278 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-19 04:16:04,280 INFO L413 NwaCegarLoop]: 7 mSDtfsCounter, 0 mSDsluCounter, 7 mSDsCounter, 0 mSdLazyCounter, 9 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 14 SdHoareTripleChecker+Invalid, 9 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 9 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-19 04:16:04,281 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 14 Invalid, 9 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 9 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-19 04:16:04,282 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 11 states. [2023-11-19 04:16:04,285 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 11 to 11. [2023-11-19 04:16:04,286 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 11 states, 10 states have (on average 1.3) internal successors, (13), 10 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 04:16:04,286 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 11 states to 11 states and 13 transitions. [2023-11-19 04:16:04,287 INFO L78 Accepts]: Start accepts. Automaton has 11 states and 13 transitions. Word has length 8 [2023-11-19 04:16:04,287 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 04:16:04,287 INFO L495 AbstractCegarLoop]: Abstraction has 11 states and 13 transitions. [2023-11-19 04:16:04,287 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 2 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 04:16:04,288 INFO L276 IsEmpty]: Start isEmpty. Operand 11 states and 13 transitions. [2023-11-19 04:16:04,288 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2023-11-19 04:16:04,288 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 04:16:04,288 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 04:16:04,289 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2023-11-19 04:16:04,289 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 04:16:04,290 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 04:16:04,290 INFO L85 PathProgramCache]: Analyzing trace with hash 2098719587, now seen corresponding path program 1 times [2023-11-19 04:16:04,290 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 04:16:04,291 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [841901650] [2023-11-19 04:16:04,291 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 04:16:04,291 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 04:16:04,312 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 04:16:04,409 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 04:16:04,409 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 04:16:04,410 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [841901650] [2023-11-19 04:16:04,410 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [841901650] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 04:16:04,411 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2084984261] [2023-11-19 04:16:04,411 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 04:16:04,411 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 04:16:04,411 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_50d3a1e4-bc54-412b-b462-dcc223315884/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 04:16:04,414 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_50d3a1e4-bc54-412b-b462-dcc223315884/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 04:16:04,434 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_50d3a1e4-bc54-412b-b462-dcc223315884/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-11-19 04:16:04,523 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 04:16:04,526 INFO L262 TraceCheckSpWp]: Trace formula consists of 60 conjuncts, 3 conjunts are in the unsatisfiable core [2023-11-19 04:16:04,532 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 04:16:04,593 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 04:16:04,594 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-19 04:16:04,636 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 04:16:04,638 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2084984261] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-19 04:16:04,641 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1051246527] [2023-11-19 04:16:04,676 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2023-11-19 04:16:04,676 INFO L166 IcfgInterpreter]: Building call graph [2023-11-19 04:16:04,681 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-19 04:16:04,690 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-19 04:16:04,690 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-19 04:16:05,413 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-19 04:16:05,630 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSifa [1051246527] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-19 04:16:05,631 INFO L185 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2023-11-19 04:16:05,631 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [3, 3, 3] total 11 [2023-11-19 04:16:05,638 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [359157911] [2023-11-19 04:16:05,639 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 04:16:05,639 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-11-19 04:16:05,639 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 04:16:05,641 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-11-19 04:16:05,642 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=93, Unknown=0, NotChecked=0, Total=132 [2023-11-19 04:16:05,642 INFO L87 Difference]: Start difference. First operand 11 states and 13 transitions. Second operand has 7 states, 7 states have (on average 1.2857142857142858) internal successors, (9), 6 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 04:16:05,696 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 04:16:05,696 INFO L93 Difference]: Finished difference Result 20 states and 23 transitions. [2023-11-19 04:16:05,697 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-11-19 04:16:05,697 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 1.2857142857142858) internal successors, (9), 6 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 9 [2023-11-19 04:16:05,697 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 04:16:05,699 INFO L225 Difference]: With dead ends: 20 [2023-11-19 04:16:05,699 INFO L226 Difference]: Without dead ends: 13 [2023-11-19 04:16:05,703 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 28 GetRequests, 18 SyntacticMatches, 0 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 34 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=39, Invalid=93, Unknown=0, NotChecked=0, Total=132 [2023-11-19 04:16:05,707 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 0 mSDsluCounter, 6 mSDsCounter, 0 mSdLazyCounter, 22 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 11 SdHoareTripleChecker+Invalid, 22 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 22 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-19 04:16:05,709 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 11 Invalid, 22 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 22 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-19 04:16:05,711 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 13 states. [2023-11-19 04:16:05,716 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 13 to 13. [2023-11-19 04:16:05,717 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 13 states, 12 states have (on average 1.25) internal successors, (15), 12 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 04:16:05,718 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 15 transitions. [2023-11-19 04:16:05,719 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 15 transitions. Word has length 9 [2023-11-19 04:16:05,719 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 04:16:05,719 INFO L495 AbstractCegarLoop]: Abstraction has 13 states and 15 transitions. [2023-11-19 04:16:05,720 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 1.2857142857142858) internal successors, (9), 6 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 04:16:05,720 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 15 transitions. [2023-11-19 04:16:05,721 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2023-11-19 04:16:05,721 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 04:16:05,721 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 04:16:05,745 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_50d3a1e4-bc54-412b-b462-dcc223315884/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Ended with exit code 0 [2023-11-19 04:16:05,936 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_50d3a1e4-bc54-412b-b462-dcc223315884/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 04:16:05,937 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 04:16:05,937 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 04:16:05,937 INFO L85 PathProgramCache]: Analyzing trace with hash 1055919578, now seen corresponding path program 1 times [2023-11-19 04:16:05,938 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 04:16:05,938 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [345887517] [2023-11-19 04:16:05,938 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 04:16:05,939 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 04:16:05,966 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 04:16:06,073 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-11-19 04:16:06,073 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 04:16:06,076 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [345887517] [2023-11-19 04:16:06,077 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [345887517] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 04:16:06,078 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [545836890] [2023-11-19 04:16:06,079 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 04:16:06,079 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 04:16:06,079 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_50d3a1e4-bc54-412b-b462-dcc223315884/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 04:16:06,083 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_50d3a1e4-bc54-412b-b462-dcc223315884/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 04:16:06,096 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_50d3a1e4-bc54-412b-b462-dcc223315884/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-11-19 04:16:06,151 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 04:16:06,152 INFO L262 TraceCheckSpWp]: Trace formula consists of 65 conjuncts, 3 conjunts are in the unsatisfiable core [2023-11-19 04:16:06,155 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 04:16:06,188 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-11-19 04:16:06,188 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-19 04:16:06,220 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-11-19 04:16:06,221 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [545836890] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-19 04:16:06,221 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2138633038] [2023-11-19 04:16:06,235 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2023-11-19 04:16:06,236 INFO L166 IcfgInterpreter]: Building call graph [2023-11-19 04:16:06,236 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-19 04:16:06,236 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-19 04:16:06,237 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-19 04:16:06,781 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-19 04:16:07,307 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '266#(and (<= 1 |#StackHeapBarrier|) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start_main_~e~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 (+ |ULTIMATE.start_main_~e~0#1| 2147483648)) (<= 2 |ULTIMATE.start_main_~#a~0#1.base|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start_main_#t~mem7#1| |ULTIMATE.start_main_~e~0#1|) (<= 100000 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0) (= |ULTIMATE.start_main_~x~0#1| 0) (exists ((|v_ULTIMATE.start_main_#t~short5#1_20| Bool) (|v_ULTIMATE.start_main_#t~mem4#1_33| Int) (|v_ULTIMATE.start_main_#t~mem4#1_32| Int)) (and (or (and (= |v_ULTIMATE.start_main_#t~mem4#1_33| |v_ULTIMATE.start_main_#t~mem4#1_32|) (not |v_ULTIMATE.start_main_#t~short5#1_20|)) (and (= |ULTIMATE.start_main_~e~0#1| |v_ULTIMATE.start_main_#t~mem4#1_33|) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (* |ULTIMATE.start_main_~i~0#1| 4)) |v_ULTIMATE.start_main_#t~mem4#1_33|) |v_ULTIMATE.start_main_#t~short5#1_20|)) (or (and (<= 100000 |ULTIMATE.start_main_~i~0#1|) (not |v_ULTIMATE.start_main_#t~short5#1_20|)) (and |v_ULTIMATE.start_main_#t~short5#1_20| (<= |ULTIMATE.start_main_~i~0#1| 99999))))) (= |ULTIMATE.start_main_#t~mem7#1| (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) 0)))' at error location [2023-11-19 04:16:07,308 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-19 04:16:07,308 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-19 04:16:07,308 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3, 3] total 6 [2023-11-19 04:16:07,308 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1671245219] [2023-11-19 04:16:07,308 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-19 04:16:07,310 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-11-19 04:16:07,310 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 04:16:07,311 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-11-19 04:16:07,312 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=46, Invalid=136, Unknown=0, NotChecked=0, Total=182 [2023-11-19 04:16:07,312 INFO L87 Difference]: Start difference. First operand 13 states and 15 transitions. Second operand has 7 states, 7 states have (on average 2.142857142857143) internal successors, (15), 6 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 04:16:07,376 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 04:16:07,377 INFO L93 Difference]: Finished difference Result 26 states and 32 transitions. [2023-11-19 04:16:07,377 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-11-19 04:16:07,378 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 2.142857142857143) internal successors, (15), 6 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 11 [2023-11-19 04:16:07,378 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 04:16:07,380 INFO L225 Difference]: With dead ends: 26 [2023-11-19 04:16:07,380 INFO L226 Difference]: Without dead ends: 16 [2023-11-19 04:16:07,381 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 22 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 47 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=46, Invalid=136, Unknown=0, NotChecked=0, Total=182 [2023-11-19 04:16:07,386 INFO L413 NwaCegarLoop]: 7 mSDtfsCounter, 0 mSDsluCounter, 14 mSDsCounter, 0 mSdLazyCounter, 16 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 21 SdHoareTripleChecker+Invalid, 17 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 16 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-19 04:16:07,387 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 21 Invalid, 17 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 16 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-19 04:16:07,389 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2023-11-19 04:16:07,395 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2023-11-19 04:16:07,396 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 16 states, 15 states have (on average 1.2) internal successors, (18), 15 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 04:16:07,398 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 18 transitions. [2023-11-19 04:16:07,399 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 18 transitions. Word has length 11 [2023-11-19 04:16:07,399 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 04:16:07,399 INFO L495 AbstractCegarLoop]: Abstraction has 16 states and 18 transitions. [2023-11-19 04:16:07,400 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 2.142857142857143) internal successors, (15), 6 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 04:16:07,400 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 18 transitions. [2023-11-19 04:16:07,400 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2023-11-19 04:16:07,400 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 04:16:07,401 INFO L195 NwaCegarLoop]: trace histogram [4, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 04:16:07,429 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_50d3a1e4-bc54-412b-b462-dcc223315884/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2023-11-19 04:16:07,620 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_50d3a1e4-bc54-412b-b462-dcc223315884/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 04:16:07,620 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 04:16:07,621 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 04:16:07,621 INFO L85 PathProgramCache]: Analyzing trace with hash 1469508281, now seen corresponding path program 2 times [2023-11-19 04:16:07,621 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 04:16:07,621 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1965237727] [2023-11-19 04:16:07,621 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 04:16:07,622 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 04:16:07,670 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 04:16:07,811 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 2 trivial. 0 not checked. [2023-11-19 04:16:07,812 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 04:16:07,813 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1965237727] [2023-11-19 04:16:07,814 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1965237727] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 04:16:07,814 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2065339679] [2023-11-19 04:16:07,814 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-19 04:16:07,815 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 04:16:07,815 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_50d3a1e4-bc54-412b-b462-dcc223315884/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 04:16:07,816 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_50d3a1e4-bc54-412b-b462-dcc223315884/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 04:16:07,840 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_50d3a1e4-bc54-412b-b462-dcc223315884/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-11-19 04:16:07,883 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2023-11-19 04:16:07,884 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-19 04:16:07,885 INFO L262 TraceCheckSpWp]: Trace formula consists of 74 conjuncts, 14 conjunts are in the unsatisfiable core [2023-11-19 04:16:07,891 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 04:16:08,045 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2023-11-19 04:16:08,045 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-19 04:16:08,168 INFO L349 Elim1Store]: treesize reduction 5, result has 37.5 percent of original size [2023-11-19 04:16:08,169 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 15 treesize of output 7 [2023-11-19 04:16:08,213 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2023-11-19 04:16:08,213 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2065339679] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-19 04:16:08,213 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [55710140] [2023-11-19 04:16:08,220 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2023-11-19 04:16:08,220 INFO L166 IcfgInterpreter]: Building call graph [2023-11-19 04:16:08,220 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-19 04:16:08,221 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-19 04:16:08,221 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-19 04:16:08,638 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-19 04:16:09,256 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '428#(and (<= 1 |#StackHeapBarrier|) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start_main_~e~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 (+ |ULTIMATE.start_main_~e~0#1| 2147483648)) (<= 2 |ULTIMATE.start_main_~#a~0#1.base|) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (= |ULTIMATE.start_main_#t~mem7#1| |ULTIMATE.start_main_~e~0#1|) (exists ((|v_ULTIMATE.start_main_#t~short5#1_20| Bool) (|v_ULTIMATE.start_main_#t~mem4#1_46| Int) (|v_ULTIMATE.start_main_#t~mem4#1_45| Int)) (and (or (and (<= 100000 |ULTIMATE.start_main_~i~0#1|) (not |v_ULTIMATE.start_main_#t~short5#1_20|)) (and |v_ULTIMATE.start_main_#t~short5#1_20| (<= |ULTIMATE.start_main_~i~0#1| 99999))) (or (and (= |v_ULTIMATE.start_main_#t~mem4#1_46| |v_ULTIMATE.start_main_#t~mem4#1_45|) (not |v_ULTIMATE.start_main_#t~short5#1_20|)) (and |v_ULTIMATE.start_main_#t~short5#1_20| (= |ULTIMATE.start_main_~e~0#1| |v_ULTIMATE.start_main_#t~mem4#1_46|) (= (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) (* |ULTIMATE.start_main_~i~0#1| 4)) |v_ULTIMATE.start_main_#t~mem4#1_46|))))) (<= 100000 |ULTIMATE.start_main_~j~0#1|) (= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 0) (= |ULTIMATE.start_main_~x~0#1| 0) (= |ULTIMATE.start_main_#t~mem7#1| (select (select |#memory_int| |ULTIMATE.start_main_~#a~0#1.base|) 0)))' at error location [2023-11-19 04:16:09,256 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-19 04:16:09,257 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-19 04:16:09,257 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 15 [2023-11-19 04:16:09,257 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [5299367] [2023-11-19 04:16:09,257 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-19 04:16:09,258 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2023-11-19 04:16:09,258 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 04:16:09,259 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2023-11-19 04:16:09,259 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=75, Invalid=431, Unknown=0, NotChecked=0, Total=506 [2023-11-19 04:16:09,259 INFO L87 Difference]: Start difference. First operand 16 states and 18 transitions. Second operand has 16 states, 16 states have (on average 2.0) internal successors, (32), 15 states have internal predecessors, (32), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 04:16:09,467 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 04:16:09,467 INFO L93 Difference]: Finished difference Result 30 states and 35 transitions. [2023-11-19 04:16:09,467 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2023-11-19 04:16:09,468 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 16 states have (on average 2.0) internal successors, (32), 15 states have internal predecessors, (32), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 14 [2023-11-19 04:16:09,468 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 04:16:09,468 INFO L225 Difference]: With dead ends: 30 [2023-11-19 04:16:09,468 INFO L226 Difference]: Without dead ends: 20 [2023-11-19 04:16:09,469 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 24 SyntacticMatches, 1 SemanticMatches, 28 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 177 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=134, Invalid=736, Unknown=0, NotChecked=0, Total=870 [2023-11-19 04:16:09,470 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 31 mSDsluCounter, 40 mSDsCounter, 0 mSdLazyCounter, 83 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 31 SdHoareTripleChecker+Valid, 45 SdHoareTripleChecker+Invalid, 83 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 83 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-19 04:16:09,470 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [31 Valid, 45 Invalid, 83 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 83 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-19 04:16:09,471 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2023-11-19 04:16:09,475 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 19. [2023-11-19 04:16:09,475 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19 states, 18 states have (on average 1.1666666666666667) internal successors, (21), 18 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 04:16:09,475 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 21 transitions. [2023-11-19 04:16:09,476 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 21 transitions. Word has length 14 [2023-11-19 04:16:09,476 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 04:16:09,476 INFO L495 AbstractCegarLoop]: Abstraction has 19 states and 21 transitions. [2023-11-19 04:16:09,477 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 16 states have (on average 2.0) internal successors, (32), 15 states have internal predecessors, (32), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 04:16:09,477 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 21 transitions. [2023-11-19 04:16:09,477 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2023-11-19 04:16:09,478 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 04:16:09,478 INFO L195 NwaCegarLoop]: trace histogram [5, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 04:16:09,502 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_50d3a1e4-bc54-412b-b462-dcc223315884/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2023-11-19 04:16:09,692 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_50d3a1e4-bc54-412b-b462-dcc223315884/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 04:16:09,692 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 04:16:09,693 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 04:16:09,693 INFO L85 PathProgramCache]: Analyzing trace with hash 880471878, now seen corresponding path program 1 times [2023-11-19 04:16:09,693 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 04:16:09,693 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [422020907] [2023-11-19 04:16:09,693 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 04:16:09,694 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 04:16:09,735 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 04:16:09,910 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-11-19 04:16:09,911 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 04:16:09,911 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [422020907] [2023-11-19 04:16:09,911 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [422020907] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 04:16:09,911 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [583273327] [2023-11-19 04:16:09,911 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 04:16:09,911 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 04:16:09,911 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_50d3a1e4-bc54-412b-b462-dcc223315884/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 04:16:09,912 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_50d3a1e4-bc54-412b-b462-dcc223315884/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 04:16:09,916 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_50d3a1e4-bc54-412b-b462-dcc223315884/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-11-19 04:16:09,984 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 04:16:09,985 INFO L262 TraceCheckSpWp]: Trace formula consists of 111 conjuncts, 7 conjunts are in the unsatisfiable core [2023-11-19 04:16:09,987 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 04:16:10,009 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-11-19 04:16:10,010 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-19 04:16:10,090 INFO L134 CoverageAnalysis]: Checked inductivity of 19 backedges. 0 proven. 15 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-11-19 04:16:10,090 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [583273327] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-19 04:16:10,090 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1821970575] [2023-11-19 04:16:10,095 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2023-11-19 04:16:10,096 INFO L166 IcfgInterpreter]: Building call graph [2023-11-19 04:16:10,096 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-19 04:16:10,096 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-19 04:16:10,096 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-19 04:16:10,576 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-19 04:16:11,050 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '638#(and (<= 1 |#StackHeapBarrier|) (<= 0 |ULTIMATE.start_main_~x~0#1|) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start_main_~e~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 (+ |ULTIMATE.start_main_~e~0#1| 2147483648)) (<= 2 |ULTIMATE.start_main_~#a~0#1.base|) (<= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 1) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (<= 100000 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start___VERIFIER_assert_#in~cond#1|))' at error location [2023-11-19 04:16:11,050 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-19 04:16:11,051 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-19 04:16:11,051 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [7, 7, 7] total 14 [2023-11-19 04:16:11,051 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [209034214] [2023-11-19 04:16:11,051 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-19 04:16:11,051 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2023-11-19 04:16:11,051 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 04:16:11,052 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2023-11-19 04:16:11,052 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=129, Invalid=377, Unknown=0, NotChecked=0, Total=506 [2023-11-19 04:16:11,053 INFO L87 Difference]: Start difference. First operand 19 states and 21 transitions. Second operand has 15 states, 15 states have (on average 1.6666666666666667) internal successors, (25), 14 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 04:16:11,085 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 04:16:11,085 INFO L93 Difference]: Finished difference Result 38 states and 48 transitions. [2023-11-19 04:16:11,086 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2023-11-19 04:16:11,086 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 15 states have (on average 1.6666666666666667) internal successors, (25), 14 states have internal predecessors, (25), 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 [2023-11-19 04:16:11,086 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 04:16:11,086 INFO L225 Difference]: With dead ends: 38 [2023-11-19 04:16:11,087 INFO L226 Difference]: Without dead ends: 26 [2023-11-19 04:16:11,087 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 38 SyntacticMatches, 0 SemanticMatches, 21 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 169 ImplicationChecksByTransitivity, 0.6s TimeCoverageRelationStatistics Valid=129, Invalid=377, Unknown=0, NotChecked=0, Total=506 [2023-11-19 04:16:11,088 INFO L413 NwaCegarLoop]: 7 mSDtfsCounter, 0 mSDsluCounter, 14 mSDsCounter, 0 mSdLazyCounter, 24 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 21 SdHoareTripleChecker+Invalid, 25 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 24 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-19 04:16:11,088 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 21 Invalid, 25 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 24 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-19 04:16:11,089 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2023-11-19 04:16:11,095 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2023-11-19 04:16:11,095 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 25 states have (on average 1.12) internal successors, (28), 25 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 04:16:11,095 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 28 transitions. [2023-11-19 04:16:11,096 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 28 transitions. Word has length 18 [2023-11-19 04:16:11,096 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 04:16:11,096 INFO L495 AbstractCegarLoop]: Abstraction has 26 states and 28 transitions. [2023-11-19 04:16:11,096 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 15 states have (on average 1.6666666666666667) internal successors, (25), 14 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 04:16:11,096 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 28 transitions. [2023-11-19 04:16:11,097 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2023-11-19 04:16:11,097 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 04:16:11,097 INFO L195 NwaCegarLoop]: trace histogram [12, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 04:16:11,124 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_50d3a1e4-bc54-412b-b462-dcc223315884/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2023-11-19 04:16:11,297 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_50d3a1e4-bc54-412b-b462-dcc223315884/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2023-11-19 04:16:11,298 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 04:16:11,298 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 04:16:11,298 INFO L85 PathProgramCache]: Analyzing trace with hash -2001751737, now seen corresponding path program 2 times [2023-11-19 04:16:11,298 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 04:16:11,299 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2139425279] [2023-11-19 04:16:11,299 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 04:16:11,299 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 04:16:11,345 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 04:16:11,662 INFO L134 CoverageAnalysis]: Checked inductivity of 82 backedges. 0 proven. 78 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-11-19 04:16:11,662 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 04:16:11,662 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2139425279] [2023-11-19 04:16:11,662 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2139425279] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 04:16:11,663 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [873042574] [2023-11-19 04:16:11,663 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-19 04:16:11,664 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 04:16:11,664 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_50d3a1e4-bc54-412b-b462-dcc223315884/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 04:16:11,665 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_50d3a1e4-bc54-412b-b462-dcc223315884/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 04:16:11,684 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_50d3a1e4-bc54-412b-b462-dcc223315884/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-11-19 04:16:11,742 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2023-11-19 04:16:11,742 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-19 04:16:11,743 INFO L262 TraceCheckSpWp]: Trace formula consists of 84 conjuncts, 5 conjunts are in the unsatisfiable core [2023-11-19 04:16:11,745 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 04:16:11,844 INFO L134 CoverageAnalysis]: Checked inductivity of 82 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2023-11-19 04:16:11,844 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-19 04:16:11,938 INFO L134 CoverageAnalysis]: Checked inductivity of 82 backedges. 2 proven. 2 refuted. 0 times theorem prover too weak. 78 trivial. 0 not checked. [2023-11-19 04:16:11,938 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [873042574] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-19 04:16:11,939 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1191523131] [2023-11-19 04:16:11,941 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2023-11-19 04:16:11,942 INFO L166 IcfgInterpreter]: Building call graph [2023-11-19 04:16:11,942 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-19 04:16:11,942 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-19 04:16:11,942 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-19 04:16:12,425 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-19 04:16:13,014 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '913#(and (<= 1 |#StackHeapBarrier|) (<= 0 |ULTIMATE.start_main_~x~0#1|) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start_main_~e~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 (+ |ULTIMATE.start_main_~e~0#1| 2147483648)) (<= 2 |ULTIMATE.start_main_~#a~0#1.base|) (<= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 1) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (<= 100000 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start___VERIFIER_assert_#in~cond#1|))' at error location [2023-11-19 04:16:13,014 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-19 04:16:13,015 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-19 04:16:13,015 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 5, 5] total 20 [2023-11-19 04:16:13,015 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1658282582] [2023-11-19 04:16:13,015 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-19 04:16:13,016 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 21 states [2023-11-19 04:16:13,016 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 04:16:13,017 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 21 interpolants. [2023-11-19 04:16:13,017 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=151, Invalid=661, Unknown=0, NotChecked=0, Total=812 [2023-11-19 04:16:13,017 INFO L87 Difference]: Start difference. First operand 26 states and 28 transitions. Second operand has 21 states, 21 states have (on average 1.9047619047619047) internal successors, (40), 20 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 04:16:13,308 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 04:16:13,308 INFO L93 Difference]: Finished difference Result 46 states and 51 transitions. [2023-11-19 04:16:13,309 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 19 states. [2023-11-19 04:16:13,309 INFO L78 Accepts]: Start accepts. Automaton has has 21 states, 21 states have (on average 1.9047619047619047) internal successors, (40), 20 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 25 [2023-11-19 04:16:13,309 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 04:16:13,310 INFO L225 Difference]: With dead ends: 46 [2023-11-19 04:16:13,310 INFO L226 Difference]: Without dead ends: 29 [2023-11-19 04:16:13,312 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 100 GetRequests, 58 SyntacticMatches, 2 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 411 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=372, Invalid=1350, Unknown=0, NotChecked=0, Total=1722 [2023-11-19 04:16:13,313 INFO L413 NwaCegarLoop]: 5 mSDtfsCounter, 0 mSDsluCounter, 46 mSDsCounter, 0 mSdLazyCounter, 80 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 51 SdHoareTripleChecker+Invalid, 80 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 80 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-19 04:16:13,313 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 51 Invalid, 80 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 80 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-19 04:16:13,314 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2023-11-19 04:16:13,322 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 29. [2023-11-19 04:16:13,323 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29 states, 28 states have (on average 1.1071428571428572) internal successors, (31), 28 states have internal predecessors, (31), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 04:16:13,323 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 31 transitions. [2023-11-19 04:16:13,324 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 31 transitions. Word has length 25 [2023-11-19 04:16:13,324 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 04:16:13,324 INFO L495 AbstractCegarLoop]: Abstraction has 29 states and 31 transitions. [2023-11-19 04:16:13,324 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 21 states, 21 states have (on average 1.9047619047619047) internal successors, (40), 20 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 04:16:13,325 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 31 transitions. [2023-11-19 04:16:13,326 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2023-11-19 04:16:13,326 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 04:16:13,326 INFO L195 NwaCegarLoop]: trace histogram [13, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 04:16:13,345 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_50d3a1e4-bc54-412b-b462-dcc223315884/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2023-11-19 04:16:13,526 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_50d3a1e4-bc54-412b-b462-dcc223315884/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 04:16:13,527 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 04:16:13,527 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 04:16:13,527 INFO L85 PathProgramCache]: Analyzing trace with hash 992579503, now seen corresponding path program 3 times [2023-11-19 04:16:13,527 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 04:16:13,527 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [795727586] [2023-11-19 04:16:13,527 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 04:16:13,527 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 04:16:13,564 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 04:16:13,832 INFO L134 CoverageAnalysis]: Checked inductivity of 99 backedges. 0 proven. 91 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2023-11-19 04:16:13,832 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 04:16:13,832 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [795727586] [2023-11-19 04:16:13,833 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [795727586] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 04:16:13,833 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [815685666] [2023-11-19 04:16:13,833 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-11-19 04:16:13,833 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 04:16:13,833 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_50d3a1e4-bc54-412b-b462-dcc223315884/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 04:16:13,834 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_50d3a1e4-bc54-412b-b462-dcc223315884/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 04:16:13,848 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_50d3a1e4-bc54-412b-b462-dcc223315884/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2023-11-19 04:16:13,942 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-11-19 04:16:13,942 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-19 04:16:13,944 INFO L262 TraceCheckSpWp]: Trace formula consists of 188 conjuncts, 15 conjunts are in the unsatisfiable core [2023-11-19 04:16:13,946 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 04:16:13,984 INFO L134 CoverageAnalysis]: Checked inductivity of 99 backedges. 0 proven. 91 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2023-11-19 04:16:13,984 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-19 04:16:14,315 INFO L134 CoverageAnalysis]: Checked inductivity of 99 backedges. 0 proven. 91 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2023-11-19 04:16:14,315 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [815685666] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-19 04:16:14,316 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1254916189] [2023-11-19 04:16:14,318 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2023-11-19 04:16:14,318 INFO L166 IcfgInterpreter]: Building call graph [2023-11-19 04:16:14,319 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-19 04:16:14,319 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-19 04:16:14,319 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-19 04:16:14,728 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-19 04:16:15,209 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1259#(and (<= 1 |#StackHeapBarrier|) (<= 0 |ULTIMATE.start_main_~x~0#1|) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start_main_~e~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 (+ |ULTIMATE.start_main_~e~0#1| 2147483648)) (<= 2 |ULTIMATE.start_main_~#a~0#1.base|) (<= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 1) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (<= 100000 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start___VERIFIER_assert_#in~cond#1|))' at error location [2023-11-19 04:16:15,209 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-19 04:16:15,209 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-19 04:16:15,209 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15, 15] total 30 [2023-11-19 04:16:15,209 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1691657835] [2023-11-19 04:16:15,209 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-19 04:16:15,210 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 31 states [2023-11-19 04:16:15,210 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 04:16:15,211 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2023-11-19 04:16:15,212 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=489, Invalid=993, Unknown=0, NotChecked=0, Total=1482 [2023-11-19 04:16:15,212 INFO L87 Difference]: Start difference. First operand 29 states and 31 transitions. Second operand has 31 states, 31 states have (on average 1.3225806451612903) internal successors, (41), 30 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) [2023-11-19 04:16:15,297 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 04:16:15,297 INFO L93 Difference]: Finished difference Result 58 states and 76 transitions. [2023-11-19 04:16:15,297 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 30 states. [2023-11-19 04:16:15,299 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 31 states have (on average 1.3225806451612903) internal successors, (41), 30 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) Word has length 28 [2023-11-19 04:16:15,299 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 04:16:15,301 INFO L225 Difference]: With dead ends: 58 [2023-11-19 04:16:15,301 INFO L226 Difference]: Without dead ends: 44 [2023-11-19 04:16:15,303 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 97 GetRequests, 60 SyntacticMatches, 0 SemanticMatches, 37 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 393 ImplicationChecksByTransitivity, 0.9s TimeCoverageRelationStatistics Valid=489, Invalid=993, Unknown=0, NotChecked=0, Total=1482 [2023-11-19 04:16:15,305 INFO L413 NwaCegarLoop]: 7 mSDtfsCounter, 0 mSDsluCounter, 21 mSDsCounter, 0 mSdLazyCounter, 43 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 28 SdHoareTripleChecker+Invalid, 44 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 43 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-19 04:16:15,305 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 28 Invalid, 44 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 43 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-19 04:16:15,306 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 44 states. [2023-11-19 04:16:15,321 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 44 to 44. [2023-11-19 04:16:15,321 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 44 states, 43 states have (on average 1.069767441860465) internal successors, (46), 43 states have internal predecessors, (46), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 04:16:15,326 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 44 states to 44 states and 46 transitions. [2023-11-19 04:16:15,326 INFO L78 Accepts]: Start accepts. Automaton has 44 states and 46 transitions. Word has length 28 [2023-11-19 04:16:15,326 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 04:16:15,326 INFO L495 AbstractCegarLoop]: Abstraction has 44 states and 46 transitions. [2023-11-19 04:16:15,327 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 31 states, 31 states have (on average 1.3225806451612903) internal successors, (41), 30 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) [2023-11-19 04:16:15,327 INFO L276 IsEmpty]: Start isEmpty. Operand 44 states and 46 transitions. [2023-11-19 04:16:15,329 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 44 [2023-11-19 04:16:15,329 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 04:16:15,329 INFO L195 NwaCegarLoop]: trace histogram [28, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 04:16:15,357 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_50d3a1e4-bc54-412b-b462-dcc223315884/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2023-11-19 04:16:15,544 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_50d3a1e4-bc54-412b-b462-dcc223315884/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 04:16:15,544 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 04:16:15,545 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 04:16:15,545 INFO L85 PathProgramCache]: Analyzing trace with hash 862950384, now seen corresponding path program 4 times [2023-11-19 04:16:15,545 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 04:16:15,545 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1513869694] [2023-11-19 04:16:15,545 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 04:16:15,545 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 04:16:15,614 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 04:16:16,524 INFO L134 CoverageAnalysis]: Checked inductivity of 414 backedges. 0 proven. 406 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2023-11-19 04:16:16,525 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 04:16:16,525 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1513869694] [2023-11-19 04:16:16,525 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1513869694] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 04:16:16,525 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [277587652] [2023-11-19 04:16:16,525 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-11-19 04:16:16,525 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 04:16:16,525 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_50d3a1e4-bc54-412b-b462-dcc223315884/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 04:16:16,526 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_50d3a1e4-bc54-412b-b462-dcc223315884/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 04:16:16,548 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_50d3a1e4-bc54-412b-b462-dcc223315884/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2023-11-19 04:16:16,686 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 04:16:16,689 INFO L262 TraceCheckSpWp]: Trace formula consists of 323 conjuncts, 30 conjunts are in the unsatisfiable core [2023-11-19 04:16:16,694 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 04:16:16,760 INFO L134 CoverageAnalysis]: Checked inductivity of 414 backedges. 0 proven. 406 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2023-11-19 04:16:16,761 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-19 04:16:18,091 INFO L134 CoverageAnalysis]: Checked inductivity of 414 backedges. 0 proven. 406 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2023-11-19 04:16:18,091 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [277587652] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-19 04:16:18,091 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [390860532] [2023-11-19 04:16:18,093 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2023-11-19 04:16:18,094 INFO L166 IcfgInterpreter]: Building call graph [2023-11-19 04:16:18,094 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-19 04:16:18,094 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-19 04:16:18,094 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-19 04:16:18,444 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-19 04:16:19,059 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1755#(and (<= 1 |#StackHeapBarrier|) (<= 0 |ULTIMATE.start_main_~x~0#1|) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start_main_~e~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 (+ |ULTIMATE.start_main_~e~0#1| 2147483648)) (<= 2 |ULTIMATE.start_main_~#a~0#1.base|) (<= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 1) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (<= 100000 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start___VERIFIER_assert_#in~cond#1|))' at error location [2023-11-19 04:16:19,059 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-19 04:16:19,059 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-19 04:16:19,059 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [30, 30, 30] total 60 [2023-11-19 04:16:19,060 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [413005857] [2023-11-19 04:16:19,060 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-19 04:16:19,060 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 61 states [2023-11-19 04:16:19,060 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 04:16:19,062 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 61 interpolants. [2023-11-19 04:16:19,065 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1854, Invalid=2838, Unknown=0, NotChecked=0, Total=4692 [2023-11-19 04:16:19,065 INFO L87 Difference]: Start difference. First operand 44 states and 46 transitions. Second operand has 61 states, 61 states have (on average 1.1639344262295082) internal successors, (71), 60 states have internal predecessors, (71), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 04:16:19,211 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 04:16:19,212 INFO L93 Difference]: Finished difference Result 88 states and 121 transitions. [2023-11-19 04:16:19,212 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 60 states. [2023-11-19 04:16:19,212 INFO L78 Accepts]: Start accepts. Automaton has has 61 states, 61 states have (on average 1.1639344262295082) internal successors, (71), 60 states have internal predecessors, (71), 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 43 [2023-11-19 04:16:19,213 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 04:16:19,213 INFO L225 Difference]: With dead ends: 88 [2023-11-19 04:16:19,213 INFO L226 Difference]: Without dead ends: 74 [2023-11-19 04:16:19,216 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 157 GetRequests, 90 SyntacticMatches, 0 SemanticMatches, 67 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 813 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=1854, Invalid=2838, Unknown=0, NotChecked=0, Total=4692 [2023-11-19 04:16:19,217 INFO L413 NwaCegarLoop]: 7 mSDtfsCounter, 0 mSDsluCounter, 42 mSDsCounter, 0 mSdLazyCounter, 82 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 49 SdHoareTripleChecker+Invalid, 83 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 82 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-19 04:16:19,217 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 49 Invalid, 83 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 82 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-19 04:16:19,218 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 74 states. [2023-11-19 04:16:19,233 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 74 to 74. [2023-11-19 04:16:19,233 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 74 states, 73 states have (on average 1.0410958904109588) internal successors, (76), 73 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) [2023-11-19 04:16:19,234 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 74 states to 74 states and 76 transitions. [2023-11-19 04:16:19,234 INFO L78 Accepts]: Start accepts. Automaton has 74 states and 76 transitions. Word has length 43 [2023-11-19 04:16:19,234 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 04:16:19,234 INFO L495 AbstractCegarLoop]: Abstraction has 74 states and 76 transitions. [2023-11-19 04:16:19,235 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 61 states, 61 states have (on average 1.1639344262295082) internal successors, (71), 60 states have internal predecessors, (71), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 04:16:19,235 INFO L276 IsEmpty]: Start isEmpty. Operand 74 states and 76 transitions. [2023-11-19 04:16:19,236 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 74 [2023-11-19 04:16:19,237 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 04:16:19,237 INFO L195 NwaCegarLoop]: trace histogram [58, 3, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 04:16:19,264 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_50d3a1e4-bc54-412b-b462-dcc223315884/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2023-11-19 04:16:19,458 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_50d3a1e4-bc54-412b-b462-dcc223315884/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 04:16:19,459 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 04:16:19,459 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 04:16:19,459 INFO L85 PathProgramCache]: Analyzing trace with hash 535577104, now seen corresponding path program 5 times [2023-11-19 04:16:19,460 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 04:16:19,460 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [784199906] [2023-11-19 04:16:19,460 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 04:16:19,460 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 04:16:19,584 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 04:16:22,643 INFO L134 CoverageAnalysis]: Checked inductivity of 1719 backedges. 0 proven. 1711 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2023-11-19 04:16:22,643 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 04:16:22,643 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [784199906] [2023-11-19 04:16:22,643 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [784199906] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 04:16:22,643 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [793565543] [2023-11-19 04:16:22,643 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-19 04:16:22,644 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 04:16:22,644 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_50d3a1e4-bc54-412b-b462-dcc223315884/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 04:16:22,648 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_50d3a1e4-bc54-412b-b462-dcc223315884/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 04:16:22,680 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_50d3a1e4-bc54-412b-b462-dcc223315884/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2023-11-19 04:16:22,805 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2023-11-19 04:16:22,805 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-19 04:16:22,807 INFO L262 TraceCheckSpWp]: Trace formula consists of 107 conjuncts, 24 conjunts are in the unsatisfiable core [2023-11-19 04:16:22,821 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 04:16:23,354 INFO L134 CoverageAnalysis]: Checked inductivity of 1719 backedges. 1 proven. 65 refuted. 0 times theorem prover too weak. 1653 trivial. 0 not checked. [2023-11-19 04:16:23,354 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-19 04:16:23,601 INFO L349 Elim1Store]: treesize reduction 5, result has 37.5 percent of original size [2023-11-19 04:16:23,601 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 17 treesize of output 7 [2023-11-19 04:16:23,767 INFO L134 CoverageAnalysis]: Checked inductivity of 1719 backedges. 1 proven. 7 refuted. 0 times theorem prover too weak. 1711 trivial. 0 not checked. [2023-11-19 04:16:23,767 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [793565543] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-19 04:16:23,767 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2017316223] [2023-11-19 04:16:23,770 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2023-11-19 04:16:23,770 INFO L166 IcfgInterpreter]: Building call graph [2023-11-19 04:16:23,770 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-19 04:16:23,770 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-19 04:16:23,770 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-19 04:16:24,196 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-19 04:16:25,142 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2566#(and (<= 1 |#StackHeapBarrier|) (<= 0 |ULTIMATE.start_main_~x~0#1|) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start_main_~e~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 (+ |ULTIMATE.start_main_~e~0#1| 2147483648)) (<= 2 |ULTIMATE.start_main_~#a~0#1.base|) (<= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 1) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (<= 100000 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start___VERIFIER_assert_#in~cond#1|))' at error location [2023-11-19 04:16:25,142 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-19 04:16:25,144 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-19 04:16:25,144 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [60, 9, 8] total 75 [2023-11-19 04:16:25,144 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [352207033] [2023-11-19 04:16:25,145 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-19 04:16:25,145 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 76 states [2023-11-19 04:16:25,145 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 04:16:25,147 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 76 interpolants. [2023-11-19 04:16:25,150 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1967, Invalid=5005, Unknown=0, NotChecked=0, Total=6972 [2023-11-19 04:16:25,151 INFO L87 Difference]: Start difference. First operand 74 states and 76 transitions. Second operand has 76 states, 76 states have (on average 1.3157894736842106) internal successors, (100), 75 states have internal predecessors, (100), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 04:16:28,211 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 04:16:28,212 INFO L93 Difference]: Finished difference Result 93 states and 98 transitions. [2023-11-19 04:16:28,212 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 70 states. [2023-11-19 04:16:28,212 INFO L78 Accepts]: Start accepts. Automaton has has 76 states, 76 states have (on average 1.3157894736842106) internal successors, (100), 75 states have internal predecessors, (100), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 73 [2023-11-19 04:16:28,213 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 04:16:28,213 INFO L225 Difference]: With dead ends: 93 [2023-11-19 04:16:28,213 INFO L226 Difference]: Without dead ends: 79 [2023-11-19 04:16:28,221 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 339 GetRequests, 195 SyntacticMatches, 0 SemanticMatches, 144 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4015 ImplicationChecksByTransitivity, 6.0s TimeCoverageRelationStatistics Valid=5655, Invalid=15515, Unknown=0, NotChecked=0, Total=21170 [2023-11-19 04:16:28,222 INFO L413 NwaCegarLoop]: 6 mSDtfsCounter, 12 mSDsluCounter, 78 mSDsCounter, 0 mSdLazyCounter, 258 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 12 SdHoareTripleChecker+Valid, 84 SdHoareTripleChecker+Invalid, 260 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 258 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-19 04:16:28,222 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [12 Valid, 84 Invalid, 260 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 258 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-19 04:16:28,223 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2023-11-19 04:16:28,238 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 78. [2023-11-19 04:16:28,239 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 78 states, 77 states have (on average 1.0389610389610389) internal successors, (80), 77 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) [2023-11-19 04:16:28,239 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 78 states to 78 states and 80 transitions. [2023-11-19 04:16:28,240 INFO L78 Accepts]: Start accepts. Automaton has 78 states and 80 transitions. Word has length 73 [2023-11-19 04:16:28,240 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 04:16:28,240 INFO L495 AbstractCegarLoop]: Abstraction has 78 states and 80 transitions. [2023-11-19 04:16:28,240 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 76 states, 76 states have (on average 1.3157894736842106) internal successors, (100), 75 states have internal predecessors, (100), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 04:16:28,241 INFO L276 IsEmpty]: Start isEmpty. Operand 78 states and 80 transitions. [2023-11-19 04:16:28,242 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 78 [2023-11-19 04:16:28,242 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 04:16:28,242 INFO L195 NwaCegarLoop]: trace histogram [59, 3, 3, 2, 2, 2, 1, 1, 1, 1, 1, 1] [2023-11-19 04:16:28,269 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_50d3a1e4-bc54-412b-b462-dcc223315884/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2023-11-19 04:16:28,464 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9,9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_50d3a1e4-bc54-412b-b462-dcc223315884/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 04:16:28,465 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 04:16:28,465 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 04:16:28,465 INFO L85 PathProgramCache]: Analyzing trace with hash -1352847823, now seen corresponding path program 6 times [2023-11-19 04:16:28,465 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 04:16:28,465 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [114159631] [2023-11-19 04:16:28,465 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 04:16:28,466 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 04:16:28,566 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 04:16:31,544 INFO L134 CoverageAnalysis]: Checked inductivity of 1783 backedges. 0 proven. 1770 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2023-11-19 04:16:31,545 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 04:16:31,545 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [114159631] [2023-11-19 04:16:31,545 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [114159631] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 04:16:31,545 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1271836516] [2023-11-19 04:16:31,545 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-11-19 04:16:31,546 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 04:16:31,546 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_50d3a1e4-bc54-412b-b462-dcc223315884/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 04:16:31,547 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_50d3a1e4-bc54-412b-b462-dcc223315884/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 04:16:31,548 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_50d3a1e4-bc54-412b-b462-dcc223315884/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2023-11-19 04:16:31,786 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-11-19 04:16:31,786 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-19 04:16:31,789 INFO L262 TraceCheckSpWp]: Trace formula consists of 612 conjuncts, 7 conjunts are in the unsatisfiable core [2023-11-19 04:16:31,797 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 04:16:32,103 INFO L134 CoverageAnalysis]: Checked inductivity of 1783 backedges. 7 proven. 6 refuted. 0 times theorem prover too weak. 1770 trivial. 0 not checked. [2023-11-19 04:16:32,104 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-19 04:16:32,404 INFO L134 CoverageAnalysis]: Checked inductivity of 1783 backedges. 7 proven. 6 refuted. 0 times theorem prover too weak. 1770 trivial. 0 not checked. [2023-11-19 04:16:32,404 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1271836516] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-19 04:16:32,404 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [951280191] [2023-11-19 04:16:32,406 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2023-11-19 04:16:32,406 INFO L166 IcfgInterpreter]: Building call graph [2023-11-19 04:16:32,406 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-19 04:16:32,407 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-19 04:16:32,407 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-19 04:16:32,785 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-19 04:16:33,774 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3533#(and (<= 1 |#StackHeapBarrier|) (<= 0 |ULTIMATE.start_main_~x~0#1|) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start_main_~e~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 (+ |ULTIMATE.start_main_~e~0#1| 2147483648)) (<= 2 |ULTIMATE.start_main_~#a~0#1.base|) (<= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 1) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (<= 100000 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start___VERIFIER_assert_#in~cond#1|))' at error location [2023-11-19 04:16:33,774 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-19 04:16:33,774 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-19 04:16:33,775 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [61, 7, 7] total 70 [2023-11-19 04:16:33,775 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1263747028] [2023-11-19 04:16:33,775 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-19 04:16:33,775 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 71 states [2023-11-19 04:16:33,776 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 04:16:33,777 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 71 interpolants. [2023-11-19 04:16:33,780 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=1954, Invalid=4208, Unknown=0, NotChecked=0, Total=6162 [2023-11-19 04:16:33,780 INFO L87 Difference]: Start difference. First operand 78 states and 80 transitions. Second operand has 71 states, 71 states have (on average 1.3380281690140845) internal successors, (95), 70 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) [2023-11-19 04:16:36,273 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 04:16:36,273 INFO L93 Difference]: Finished difference Result 106 states and 111 transitions. [2023-11-19 04:16:36,274 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 68 states. [2023-11-19 04:16:36,274 INFO L78 Accepts]: Start accepts. Automaton has has 71 states, 71 states have (on average 1.3380281690140845) internal successors, (95), 70 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) Word has length 77 [2023-11-19 04:16:36,275 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 04:16:36,276 INFO L225 Difference]: With dead ends: 106 [2023-11-19 04:16:36,276 INFO L226 Difference]: Without dead ends: 81 [2023-11-19 04:16:36,281 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 350 GetRequests, 210 SyntacticMatches, 3 SemanticMatches, 137 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3476 ImplicationChecksByTransitivity, 5.3s TimeCoverageRelationStatistics Valid=5854, Invalid=13328, Unknown=0, NotChecked=0, Total=19182 [2023-11-19 04:16:36,282 INFO L413 NwaCegarLoop]: 6 mSDtfsCounter, 0 mSDsluCounter, 32 mSDsCounter, 0 mSdLazyCounter, 120 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 38 SdHoareTripleChecker+Invalid, 120 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 120 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-19 04:16:36,282 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 38 Invalid, 120 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 120 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-19 04:16:36,283 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2023-11-19 04:16:36,306 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 81. [2023-11-19 04:16:36,306 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 81 states, 80 states have (on average 1.0375) internal successors, (83), 80 states have internal predecessors, (83), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 04:16:36,307 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 83 transitions. [2023-11-19 04:16:36,307 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 83 transitions. Word has length 77 [2023-11-19 04:16:36,308 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 04:16:36,308 INFO L495 AbstractCegarLoop]: Abstraction has 81 states and 83 transitions. [2023-11-19 04:16:36,308 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 71 states, 71 states have (on average 1.3380281690140845) internal successors, (95), 70 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) [2023-11-19 04:16:36,308 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 83 transitions. [2023-11-19 04:16:36,310 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 81 [2023-11-19 04:16:36,310 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 04:16:36,310 INFO L195 NwaCegarLoop]: trace histogram [60, 4, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1] [2023-11-19 04:16:36,337 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_50d3a1e4-bc54-412b-b462-dcc223315884/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2023-11-19 04:16:36,524 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_50d3a1e4-bc54-412b-b462-dcc223315884/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 04:16:36,524 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 04:16:36,525 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 04:16:36,525 INFO L85 PathProgramCache]: Analyzing trace with hash 1829984551, now seen corresponding path program 7 times [2023-11-19 04:16:36,525 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 04:16:36,525 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [713067496] [2023-11-19 04:16:36,525 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 04:16:36,525 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 04:16:36,597 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 04:16:39,405 INFO L134 CoverageAnalysis]: Checked inductivity of 1849 backedges. 0 proven. 1830 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2023-11-19 04:16:39,405 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 04:16:39,406 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [713067496] [2023-11-19 04:16:39,406 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [713067496] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 04:16:39,406 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1561568344] [2023-11-19 04:16:39,406 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-11-19 04:16:39,406 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 04:16:39,406 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_50d3a1e4-bc54-412b-b462-dcc223315884/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 04:16:39,407 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_50d3a1e4-bc54-412b-b462-dcc223315884/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 04:16:39,413 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_50d3a1e4-bc54-412b-b462-dcc223315884/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2023-11-19 04:16:39,652 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 04:16:39,656 INFO L262 TraceCheckSpWp]: Trace formula consists of 626 conjuncts, 62 conjunts are in the unsatisfiable core [2023-11-19 04:16:39,660 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 04:16:39,796 INFO L134 CoverageAnalysis]: Checked inductivity of 1849 backedges. 0 proven. 1830 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2023-11-19 04:16:39,796 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-19 04:16:44,642 INFO L134 CoverageAnalysis]: Checked inductivity of 1849 backedges. 0 proven. 1830 refuted. 0 times theorem prover too weak. 19 trivial. 0 not checked. [2023-11-19 04:16:44,643 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1561568344] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-19 04:16:44,643 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1942713861] [2023-11-19 04:16:44,644 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2023-11-19 04:16:44,645 INFO L166 IcfgInterpreter]: Building call graph [2023-11-19 04:16:44,645 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-19 04:16:44,645 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-19 04:16:44,645 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-19 04:16:44,964 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-19 04:16:45,742 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4592#(and (<= 1 |#StackHeapBarrier|) (<= 0 |ULTIMATE.start_main_~x~0#1|) (<= 1 |ULTIMATE.start_main_~i~0#1|) (<= |ULTIMATE.start_main_~e~0#1| 2147483647) (= |ULTIMATE.start___VERIFIER_assert_~cond#1| 0) (<= 0 (+ |ULTIMATE.start_main_~e~0#1| 2147483648)) (<= 2 |ULTIMATE.start_main_~#a~0#1.base|) (<= |ULTIMATE.start___VERIFIER_assert_#in~cond#1| 1) (= |ULTIMATE.start_main_~#a~0#1.offset| 0) (<= 100000 |ULTIMATE.start_main_~j~0#1|) (<= 0 |ULTIMATE.start___VERIFIER_assert_#in~cond#1|))' at error location [2023-11-19 04:16:45,742 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-19 04:16:45,742 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-19 04:16:45,742 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [62, 62, 62] total 124 [2023-11-19 04:16:45,743 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1727678407] [2023-11-19 04:16:45,743 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-19 04:16:45,743 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 125 states [2023-11-19 04:16:45,744 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 04:16:45,748 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 125 interpolants. [2023-11-19 04:16:45,749 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7774, Invalid=9782, Unknown=0, NotChecked=0, Total=17556 [2023-11-19 04:16:45,750 INFO L87 Difference]: Start difference. First operand 81 states and 83 transitions. Second operand has 125 states, 125 states have (on average 1.08) internal successors, (135), 124 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) [2023-11-19 04:16:46,024 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 04:16:46,024 INFO L93 Difference]: Finished difference Result 162 states and 227 transitions. [2023-11-19 04:16:46,025 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 124 states. [2023-11-19 04:16:46,025 INFO L78 Accepts]: Start accepts. Automaton has has 125 states, 125 states have (on average 1.08) internal successors, (135), 124 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) Word has length 80 [2023-11-19 04:16:46,026 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 04:16:46,027 INFO L225 Difference]: With dead ends: 162 [2023-11-19 04:16:46,027 INFO L226 Difference]: Without dead ends: 143 [2023-11-19 04:16:46,029 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 300 GetRequests, 169 SyntacticMatches, 0 SemanticMatches, 131 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1709 ImplicationChecksByTransitivity, 7.1s TimeCoverageRelationStatistics Valid=7774, Invalid=9782, Unknown=0, NotChecked=0, Total=17556 [2023-11-19 04:16:46,030 INFO L413 NwaCegarLoop]: 7 mSDtfsCounter, 0 mSDsluCounter, 28 mSDsCounter, 0 mSdLazyCounter, 139 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 35 SdHoareTripleChecker+Invalid, 140 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 139 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-19 04:16:46,030 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 35 Invalid, 140 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 139 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-19 04:16:46,031 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 143 states. [2023-11-19 04:16:46,058 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 143 to 143. [2023-11-19 04:16:46,059 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 143 states, 142 states have (on average 1.0211267605633803) internal successors, (145), 142 states have internal predecessors, (145), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 04:16:46,059 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 143 states to 143 states and 145 transitions. [2023-11-19 04:16:46,059 INFO L78 Accepts]: Start accepts. Automaton has 143 states and 145 transitions. Word has length 80 [2023-11-19 04:16:46,060 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 04:16:46,060 INFO L495 AbstractCegarLoop]: Abstraction has 143 states and 145 transitions. [2023-11-19 04:16:46,060 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 125 states, 125 states have (on average 1.08) internal successors, (135), 124 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) [2023-11-19 04:16:46,061 INFO L276 IsEmpty]: Start isEmpty. Operand 143 states and 145 transitions. [2023-11-19 04:16:46,063 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 143 [2023-11-19 04:16:46,063 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 04:16:46,063 INFO L195 NwaCegarLoop]: trace histogram [122, 4, 3, 3, 2, 2, 1, 1, 1, 1, 1, 1] [2023-11-19 04:16:46,086 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_50d3a1e4-bc54-412b-b462-dcc223315884/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Ended with exit code 0 [2023-11-19 04:16:46,284 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_50d3a1e4-bc54-412b-b462-dcc223315884/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2023-11-19 04:16:46,284 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 04:16:46,284 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 04:16:46,284 INFO L85 PathProgramCache]: Analyzing trace with hash 223150343, now seen corresponding path program 8 times [2023-11-19 04:16:46,284 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 04:16:46,285 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1845726544] [2023-11-19 04:16:46,285 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 04:16:46,285 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 04:16:46,470 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat