./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/reducercommutativity/sep40-1.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 9bd2c7ff Calling Ultimate with: /usr/lib/jvm/java-11-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60a199c2-3833-4939-8bf7-56154fc7d199/bin/utaipan-verify-t7M7D8N6sZ/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60a199c2-3833-4939-8bf7-56154fc7d199/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_60a199c2-3833-4939-8bf7-56154fc7d199/bin/utaipan-verify-t7M7D8N6sZ/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60a199c2-3833-4939-8bf7-56154fc7d199/bin/utaipan-verify-t7M7D8N6sZ/config/TaipanReach.xml -i ../../sv-benchmarks/c/reducercommutativity/sep40-1.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60a199c2-3833-4939-8bf7-56154fc7d199/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_60a199c2-3833-4939-8bf7-56154fc7d199/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 f09ee736f3dbb8dbc36f75a04671608fd1c3014086677159a28111a32a84bd34 --- Real Ultimate output --- This is Ultimate 0.2.3-dev-9bd2c7f [2023-11-19 05:14:54,301 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-11-19 05:14:54,446 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60a199c2-3833-4939-8bf7-56154fc7d199/bin/utaipan-verify-t7M7D8N6sZ/config/svcomp-Reach-32bit-Taipan_Default.epf [2023-11-19 05:14:54,453 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-11-19 05:14:54,454 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-11-19 05:14:54,484 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-11-19 05:14:54,485 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-11-19 05:14:54,485 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-11-19 05:14:54,486 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-11-19 05:14:54,487 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-11-19 05:14:54,488 INFO L153 SettingsManager]: * User list type=DISABLED [2023-11-19 05:14:54,489 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-11-19 05:14:54,490 INFO L153 SettingsManager]: * Explicit value domain=true [2023-11-19 05:14:54,490 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-11-19 05:14:54,491 INFO L153 SettingsManager]: * Octagon Domain=false [2023-11-19 05:14:54,492 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-11-19 05:14:54,493 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-11-19 05:14:54,493 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-11-19 05:14:54,494 INFO L153 SettingsManager]: * Interval Domain=false [2023-11-19 05:14:54,495 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-11-19 05:14:54,495 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-11-19 05:14:54,496 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2023-11-19 05:14:54,497 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-11-19 05:14:54,498 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-11-19 05:14:54,498 INFO L153 SettingsManager]: * sizeof long=4 [2023-11-19 05:14:54,499 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-11-19 05:14:54,500 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-11-19 05:14:54,500 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-11-19 05:14:54,501 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-11-19 05:14:54,501 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-11-19 05:14:54,502 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-11-19 05:14:54,502 INFO L153 SettingsManager]: * sizeof long double=12 [2023-11-19 05:14:54,503 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2023-11-19 05:14:54,503 INFO L153 SettingsManager]: * Use constant arrays=true [2023-11-19 05:14:54,504 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-11-19 05:14:54,504 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-11-19 05:14:54,504 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-19 05:14:54,505 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-11-19 05:14:54,505 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-11-19 05:14:54,506 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2023-11-19 05:14:54,506 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-11-19 05:14:54,506 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-11-19 05:14:54,507 INFO L153 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-11-19 05:14:54,507 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-11-19 05:14:54,507 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-11-19 05:14:54,508 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_60a199c2-3833-4939-8bf7-56154fc7d199/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60a199c2-3833-4939-8bf7-56154fc7d199/bin/utaipan-verify-t7M7D8N6sZ Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> f09ee736f3dbb8dbc36f75a04671608fd1c3014086677159a28111a32a84bd34 [2023-11-19 05:14:54,868 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-11-19 05:14:54,912 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-11-19 05:14:54,915 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-11-19 05:14:54,917 INFO L270 PluginConnector]: Initializing CDTParser... [2023-11-19 05:14:54,917 INFO L274 PluginConnector]: CDTParser initialized [2023-11-19 05:14:54,920 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60a199c2-3833-4939-8bf7-56154fc7d199/bin/utaipan-verify-t7M7D8N6sZ/../../sv-benchmarks/c/reducercommutativity/sep40-1.i [2023-11-19 05:14:58,676 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-11-19 05:14:58,903 INFO L384 CDTParser]: Found 1 translation units. [2023-11-19 05:14:58,904 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60a199c2-3833-4939-8bf7-56154fc7d199/sv-benchmarks/c/reducercommutativity/sep40-1.i [2023-11-19 05:14:58,915 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60a199c2-3833-4939-8bf7-56154fc7d199/bin/utaipan-verify-t7M7D8N6sZ/data/fe1e9a7b1/5aa86e4f2c854d10a53316e515e88ab6/FLAG8ff860e45 [2023-11-19 05:14:58,942 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60a199c2-3833-4939-8bf7-56154fc7d199/bin/utaipan-verify-t7M7D8N6sZ/data/fe1e9a7b1/5aa86e4f2c854d10a53316e515e88ab6 [2023-11-19 05:14:58,951 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-11-19 05:14:58,953 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-11-19 05:14:58,955 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-11-19 05:14:58,955 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-11-19 05:14:58,962 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-11-19 05:14:58,966 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.11 05:14:58" (1/1) ... [2023-11-19 05:14:58,967 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@1e85c656 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:14:58, skipping insertion in model container [2023-11-19 05:14:58,967 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.11 05:14:58" (1/1) ... [2023-11-19 05:14:58,999 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-11-19 05:14:59,268 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_60a199c2-3833-4939-8bf7-56154fc7d199/sv-benchmarks/c/reducercommutativity/sep40-1.i[1293,1306] [2023-11-19 05:14:59,275 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-19 05:14:59,289 INFO L202 MainTranslator]: Completed pre-run [2023-11-19 05:14:59,313 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_60a199c2-3833-4939-8bf7-56154fc7d199/sv-benchmarks/c/reducercommutativity/sep40-1.i[1293,1306] [2023-11-19 05:14:59,315 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-19 05:14:59,334 INFO L206 MainTranslator]: Completed translation [2023-11-19 05:14:59,335 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:14:59 WrapperNode [2023-11-19 05:14:59,335 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-11-19 05:14:59,336 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-11-19 05:14:59,337 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-11-19 05:14:59,337 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-11-19 05:14:59,347 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:14:59" (1/1) ... [2023-11-19 05:14:59,357 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:14:59" (1/1) ... [2023-11-19 05:14:59,383 INFO L138 Inliner]: procedures = 16, calls = 22, calls flagged for inlining = 2, calls inlined = 2, statements flattened = 69 [2023-11-19 05:14:59,384 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-11-19 05:14:59,385 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-11-19 05:14:59,385 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-11-19 05:14:59,385 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-11-19 05:14:59,397 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:14:59" (1/1) ... [2023-11-19 05:14:59,397 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:14:59" (1/1) ... [2023-11-19 05:14:59,401 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:14:59" (1/1) ... [2023-11-19 05:14:59,401 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:14:59" (1/1) ... [2023-11-19 05:14:59,410 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:14:59" (1/1) ... [2023-11-19 05:14:59,414 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:14:59" (1/1) ... [2023-11-19 05:14:59,416 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:14:59" (1/1) ... [2023-11-19 05:14:59,417 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:14:59" (1/1) ... [2023-11-19 05:14:59,420 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-11-19 05:14:59,422 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-11-19 05:14:59,422 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-11-19 05:14:59,422 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-11-19 05:14:59,423 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:14:59" (1/1) ... [2023-11-19 05:14:59,437 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-19 05:14:59,453 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60a199c2-3833-4939-8bf7-56154fc7d199/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 05:14:59,474 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60a199c2-3833-4939-8bf7-56154fc7d199/bin/utaipan-verify-t7M7D8N6sZ/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-11-19 05:14:59,476 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60a199c2-3833-4939-8bf7-56154fc7d199/bin/utaipan-verify-t7M7D8N6sZ/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-11-19 05:14:59,514 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-11-19 05:14:59,514 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-11-19 05:14:59,515 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2023-11-19 05:14:59,515 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-11-19 05:14:59,515 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-11-19 05:14:59,516 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-11-19 05:14:59,516 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-11-19 05:14:59,516 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-11-19 05:14:59,517 INFO L130 BoogieDeclarations]: Found specification of procedure sep [2023-11-19 05:14:59,517 INFO L138 BoogieDeclarations]: Found implementation of procedure sep [2023-11-19 05:14:59,635 INFO L236 CfgBuilder]: Building ICFG [2023-11-19 05:14:59,639 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2023-11-19 05:14:59,900 INFO L277 CfgBuilder]: Performing block encoding [2023-11-19 05:15:00,023 INFO L297 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-11-19 05:15:00,024 INFO L302 CfgBuilder]: Removed 3 assume(true) statements. [2023-11-19 05:15:00,030 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.11 05:15:00 BoogieIcfgContainer [2023-11-19 05:15:00,031 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-11-19 05:15:00,036 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-11-19 05:15:00,036 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-11-19 05:15:00,042 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-11-19 05:15:00,042 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 19.11 05:14:58" (1/3) ... [2023-11-19 05:15:00,043 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@726421a2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.11 05:15:00, skipping insertion in model container [2023-11-19 05:15:00,043 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:14:59" (2/3) ... [2023-11-19 05:15:00,045 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@726421a2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.11 05:15:00, skipping insertion in model container [2023-11-19 05:15:00,046 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.11 05:15:00" (3/3) ... [2023-11-19 05:15:00,048 INFO L112 eAbstractionObserver]: Analyzing ICFG sep40-1.i [2023-11-19 05:15:00,072 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-11-19 05:15:00,072 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-11-19 05:15:00,152 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-11-19 05:15:00,162 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;@3b937e25, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-11-19 05:15:00,162 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-11-19 05:15:00,168 INFO L276 IsEmpty]: Start isEmpty. Operand has 17 states, 11 states have (on average 1.4545454545454546) internal successors, (16), 12 states have internal predecessors, (16), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-11-19 05:15:00,179 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2023-11-19 05:15:00,180 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:15:00,181 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 05:15:00,182 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 05:15:00,192 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:15:00,192 INFO L85 PathProgramCache]: Analyzing trace with hash -1081910660, now seen corresponding path program 1 times [2023-11-19 05:15:00,205 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:15:00,205 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [509177620] [2023-11-19 05:15:00,206 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:15:00,206 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:15:00,389 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:15:00,601 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2023-11-19 05:15:00,602 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:15:00,603 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [509177620] [2023-11-19 05:15:00,604 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [509177620] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-19 05:15:00,604 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-19 05:15:00,604 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-11-19 05:15:00,607 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1564722782] [2023-11-19 05:15:00,608 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 05:15:00,614 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-19 05:15:00,614 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:15:00,655 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-19 05:15:00,656 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-19 05:15:00,659 INFO L87 Difference]: Start difference. First operand has 17 states, 11 states have (on average 1.4545454545454546) internal successors, (16), 12 states have internal predecessors, (16), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Second operand has 3 states, 3 states have (on average 3.3333333333333335) internal successors, (10), 3 states have internal predecessors, (10), 1 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) [2023-11-19 05:15:00,752 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:15:00,752 INFO L93 Difference]: Finished difference Result 33 states and 43 transitions. [2023-11-19 05:15:00,754 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-19 05:15:00,755 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 3.3333333333333335) internal successors, (10), 3 states have internal predecessors, (10), 1 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) Word has length 20 [2023-11-19 05:15:00,756 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:15:00,764 INFO L225 Difference]: With dead ends: 33 [2023-11-19 05:15:00,765 INFO L226 Difference]: Without dead ends: 16 [2023-11-19 05:15:00,768 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-19 05:15:00,773 INFO L413 NwaCegarLoop]: 13 mSDtfsCounter, 0 mSDsluCounter, 13 mSDsCounter, 0 mSdLazyCounter, 15 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 26 SdHoareTripleChecker+Invalid, 15 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 15 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-19 05:15:00,775 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 26 Invalid, 15 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 15 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-19 05:15:00,798 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2023-11-19 05:15:00,822 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 16. [2023-11-19 05:15:00,824 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 16 states, 11 states have (on average 1.2727272727272727) internal successors, (14), 11 states have internal predecessors, (14), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-11-19 05:15:00,826 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 20 transitions. [2023-11-19 05:15:00,828 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 20 transitions. Word has length 20 [2023-11-19 05:15:00,828 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:15:00,828 INFO L495 AbstractCegarLoop]: Abstraction has 16 states and 20 transitions. [2023-11-19 05:15:00,829 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 3.3333333333333335) internal successors, (10), 3 states have internal predecessors, (10), 1 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 1 states have call predecessors, (3), 1 states have call successors, (3) [2023-11-19 05:15:00,829 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 20 transitions. [2023-11-19 05:15:00,831 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2023-11-19 05:15:00,831 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:15:00,831 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 05:15:00,832 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-11-19 05:15:00,832 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 05:15:00,833 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:15:00,833 INFO L85 PathProgramCache]: Analyzing trace with hash 1706975052, now seen corresponding path program 1 times [2023-11-19 05:15:00,834 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:15:00,834 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [566271619] [2023-11-19 05:15:00,834 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:15:00,835 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:15:00,861 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:15:01,072 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2023-11-19 05:15:01,073 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:15:01,073 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [566271619] [2023-11-19 05:15:01,073 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [566271619] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 05:15:01,074 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1011508216] [2023-11-19 05:15:01,074 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:15:01,074 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:15:01,075 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60a199c2-3833-4939-8bf7-56154fc7d199/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 05:15:01,081 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60a199c2-3833-4939-8bf7-56154fc7d199/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 05:15:01,093 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60a199c2-3833-4939-8bf7-56154fc7d199/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-11-19 05:15:01,195 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:15:01,198 INFO L262 TraceCheckSpWp]: Trace formula consists of 129 conjuncts, 2 conjunts are in the unsatisfiable core [2023-11-19 05:15:01,204 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 05:15:01,233 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-11-19 05:15:01,234 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-19 05:15:01,234 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1011508216] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-19 05:15:01,234 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-19 05:15:01,235 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [4] total 5 [2023-11-19 05:15:01,236 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1094191156] [2023-11-19 05:15:01,236 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 05:15:01,237 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-19 05:15:01,238 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:15:01,239 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-19 05:15:01,239 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2023-11-19 05:15:01,240 INFO L87 Difference]: Start difference. First operand 16 states and 20 transitions. Second operand has 3 states, 3 states have (on average 4.333333333333333) internal successors, (13), 3 states have internal predecessors, (13), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (3), 1 states have call predecessors, (3), 2 states have call successors, (3) [2023-11-19 05:15:01,274 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:15:01,274 INFO L93 Difference]: Finished difference Result 29 states and 39 transitions. [2023-11-19 05:15:01,277 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-19 05:15:01,278 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 4.333333333333333) internal successors, (13), 3 states have internal predecessors, (13), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (3), 1 states have call predecessors, (3), 2 states have call successors, (3) Word has length 21 [2023-11-19 05:15:01,279 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:15:01,280 INFO L225 Difference]: With dead ends: 29 [2023-11-19 05:15:01,281 INFO L226 Difference]: Without dead ends: 17 [2023-11-19 05:15:01,282 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 24 GetRequests, 21 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2023-11-19 05:15:01,286 INFO L413 NwaCegarLoop]: 12 mSDtfsCounter, 0 mSDsluCounter, 11 mSDsCounter, 0 mSdLazyCounter, 14 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 23 SdHoareTripleChecker+Invalid, 14 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 14 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-19 05:15:01,290 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 23 Invalid, 14 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 14 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-19 05:15:01,306 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2023-11-19 05:15:01,312 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 17. [2023-11-19 05:15:01,313 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17 states, 12 states have (on average 1.25) internal successors, (15), 12 states have internal predecessors, (15), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-11-19 05:15:01,315 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 21 transitions. [2023-11-19 05:15:01,316 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 21 transitions. Word has length 21 [2023-11-19 05:15:01,316 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:15:01,316 INFO L495 AbstractCegarLoop]: Abstraction has 17 states and 21 transitions. [2023-11-19 05:15:01,317 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 4.333333333333333) internal successors, (13), 3 states have internal predecessors, (13), 2 states have call successors, (3), 2 states have call predecessors, (3), 1 states have return successors, (3), 1 states have call predecessors, (3), 2 states have call successors, (3) [2023-11-19 05:15:01,317 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 21 transitions. [2023-11-19 05:15:01,319 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2023-11-19 05:15:01,319 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:15:01,319 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 05:15:01,337 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60a199c2-3833-4939-8bf7-56154fc7d199/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-11-19 05:15:01,520 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60a199c2-3833-4939-8bf7-56154fc7d199/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:15:01,520 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 05:15:01,521 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:15:01,522 INFO L85 PathProgramCache]: Analyzing trace with hash 2015697050, now seen corresponding path program 1 times [2023-11-19 05:15:01,523 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:15:01,525 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2063331713] [2023-11-19 05:15:01,527 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:15:01,528 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:15:01,558 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:15:01,768 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2023-11-19 05:15:01,770 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:15:01,771 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2063331713] [2023-11-19 05:15:01,773 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2063331713] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 05:15:01,773 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1349171459] [2023-11-19 05:15:01,773 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:15:01,774 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:15:01,774 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60a199c2-3833-4939-8bf7-56154fc7d199/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 05:15:01,779 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60a199c2-3833-4939-8bf7-56154fc7d199/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 05:15:01,786 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60a199c2-3833-4939-8bf7-56154fc7d199/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-11-19 05:15:01,888 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:15:01,889 INFO L262 TraceCheckSpWp]: Trace formula consists of 141 conjuncts, 2 conjunts are in the unsatisfiable core [2023-11-19 05:15:01,892 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 05:15:01,911 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 12 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2023-11-19 05:15:01,911 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-19 05:15:01,911 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1349171459] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-19 05:15:01,912 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-19 05:15:01,912 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [4] total 5 [2023-11-19 05:15:01,913 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1623528478] [2023-11-19 05:15:01,914 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 05:15:01,916 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-19 05:15:01,916 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:15:01,919 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-19 05:15:01,919 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2023-11-19 05:15:01,920 INFO L87 Difference]: Start difference. First operand 17 states and 21 transitions. Second operand has 3 states, 3 states have (on average 5.0) internal successors, (15), 3 states have internal predecessors, (15), 2 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2023-11-19 05:15:01,950 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:15:01,951 INFO L93 Difference]: Finished difference Result 27 states and 32 transitions. [2023-11-19 05:15:01,951 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-19 05:15:01,952 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 5.0) internal successors, (15), 3 states have internal predecessors, (15), 2 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 24 [2023-11-19 05:15:01,952 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:15:01,953 INFO L225 Difference]: With dead ends: 27 [2023-11-19 05:15:01,953 INFO L226 Difference]: Without dead ends: 18 [2023-11-19 05:15:01,954 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 27 GetRequests, 24 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2023-11-19 05:15:01,955 INFO L413 NwaCegarLoop]: 12 mSDtfsCounter, 0 mSDsluCounter, 11 mSDsCounter, 0 mSdLazyCounter, 14 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 23 SdHoareTripleChecker+Invalid, 14 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 14 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-19 05:15:01,956 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 23 Invalid, 14 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 14 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-19 05:15:01,958 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2023-11-19 05:15:01,961 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2023-11-19 05:15:01,962 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 18 states, 13 states have (on average 1.2307692307692308) internal successors, (16), 13 states have internal predecessors, (16), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-11-19 05:15:01,963 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 22 transitions. [2023-11-19 05:15:01,963 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 22 transitions. Word has length 24 [2023-11-19 05:15:01,965 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:15:01,965 INFO L495 AbstractCegarLoop]: Abstraction has 18 states and 22 transitions. [2023-11-19 05:15:01,966 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 5.0) internal successors, (15), 3 states have internal predecessors, (15), 2 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2023-11-19 05:15:01,966 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 22 transitions. [2023-11-19 05:15:01,967 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2023-11-19 05:15:01,967 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:15:01,968 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 05:15:01,999 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60a199c2-3833-4939-8bf7-56154fc7d199/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2023-11-19 05:15:02,188 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60a199c2-3833-4939-8bf7-56154fc7d199/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:15:02,189 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 05:15:02,190 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:15:02,190 INFO L85 PathProgramCache]: Analyzing trace with hash -167844906, now seen corresponding path program 1 times [2023-11-19 05:15:02,190 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:15:02,190 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1786867285] [2023-11-19 05:15:02,191 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:15:02,191 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:15:02,211 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:15:02,304 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2023-11-19 05:15:02,305 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:15:02,305 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1786867285] [2023-11-19 05:15:02,306 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1786867285] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 05:15:02,306 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2034841338] [2023-11-19 05:15:02,306 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:15:02,306 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:15:02,307 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60a199c2-3833-4939-8bf7-56154fc7d199/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 05:15:02,308 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60a199c2-3833-4939-8bf7-56154fc7d199/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 05:15:02,328 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60a199c2-3833-4939-8bf7-56154fc7d199/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-11-19 05:15:02,454 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:15:02,455 INFO L262 TraceCheckSpWp]: Trace formula consists of 148 conjuncts, 3 conjunts are in the unsatisfiable core [2023-11-19 05:15:02,459 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 05:15:02,514 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2023-11-19 05:15:02,515 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-19 05:15:02,585 INFO L134 CoverageAnalysis]: Checked inductivity of 23 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2023-11-19 05:15:02,586 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2034841338] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-19 05:15:02,586 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [518895946] [2023-11-19 05:15:02,621 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2023-11-19 05:15:02,621 INFO L166 IcfgInterpreter]: Building call graph [2023-11-19 05:15:02,625 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-19 05:15:02,633 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-19 05:15:02,633 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-19 05:15:03,642 INFO L197 IcfgInterpreter]: Interpreting procedure sep with input of size 10 for LOIs [2023-11-19 05:15:03,740 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-19 05:15:04,195 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '522#(and (<= 1 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~ret2~0#1| 2147483647) (or (not (= |ULTIMATE.start_main_~ret2~0#1| |ULTIMATE.start_main_~ret~1#1|)) (not (= |ULTIMATE.start_main_~ret5~0#1| |ULTIMATE.start_main_~ret~1#1|))) (<= 0 (+ |ULTIMATE.start_main_~ret~1#1| 2147483648)) (<= 0 (+ |ULTIMATE.start_main_~ret5~0#1| 2147483648)) (<= |ULTIMATE.start_main_~ret~1#1| 2147483647) (<= 2 |ULTIMATE.start_main_~#x~0#1.base|) (= |ULTIMATE.start_main_~#x~0#1.offset| 0) (<= 0 (+ |ULTIMATE.start_main_~ret2~0#1| 2147483648)) (<= |ULTIMATE.start_main_~ret5~0#1| 2147483647))' at error location [2023-11-19 05:15:04,195 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-19 05:15:04,196 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-19 05:15:04,196 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 3, 4] total 7 [2023-11-19 05:15:04,196 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [524509801] [2023-11-19 05:15:04,197 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-19 05:15:04,198 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-11-19 05:15:04,198 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:15:04,199 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-11-19 05:15:04,199 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=62, Invalid=235, Unknown=9, NotChecked=0, Total=306 [2023-11-19 05:15:04,200 INFO L87 Difference]: Start difference. First operand 18 states and 22 transitions. Second operand has 7 states, 7 states have (on average 3.0) internal successors, (21), 7 states have internal predecessors, (21), 1 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (6), 1 states have call predecessors, (6), 1 states have call successors, (6) [2023-11-19 05:15:04,240 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:15:04,240 INFO L93 Difference]: Finished difference Result 36 states and 46 transitions. [2023-11-19 05:15:04,241 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-11-19 05:15:04,241 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 3.0) internal successors, (21), 7 states have internal predecessors, (21), 1 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (6), 1 states have call predecessors, (6), 1 states have call successors, (6) Word has length 25 [2023-11-19 05:15:04,242 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:15:04,242 INFO L225 Difference]: With dead ends: 36 [2023-11-19 05:15:04,243 INFO L226 Difference]: Without dead ends: 21 [2023-11-19 05:15:04,244 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 77 GetRequests, 61 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 83 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=62, Invalid=235, Unknown=9, NotChecked=0, Total=306 [2023-11-19 05:15:04,245 INFO L413 NwaCegarLoop]: 12 mSDtfsCounter, 0 mSDsluCounter, 36 mSDsCounter, 0 mSdLazyCounter, 26 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 48 SdHoareTripleChecker+Invalid, 27 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 26 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-19 05:15:04,246 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 48 Invalid, 27 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 26 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-19 05:15:04,247 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2023-11-19 05:15:04,251 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 21. [2023-11-19 05:15:04,252 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21 states, 16 states have (on average 1.1875) internal successors, (19), 16 states have internal predecessors, (19), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-11-19 05:15:04,254 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 25 transitions. [2023-11-19 05:15:04,255 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 25 transitions. Word has length 25 [2023-11-19 05:15:04,256 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:15:04,256 INFO L495 AbstractCegarLoop]: Abstraction has 21 states and 25 transitions. [2023-11-19 05:15:04,256 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 3.0) internal successors, (21), 7 states have internal predecessors, (21), 1 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (6), 1 states have call predecessors, (6), 1 states have call successors, (6) [2023-11-19 05:15:04,257 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 25 transitions. [2023-11-19 05:15:04,258 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2023-11-19 05:15:04,259 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:15:04,259 INFO L195 NwaCegarLoop]: trace histogram [4, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 05:15:04,289 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60a199c2-3833-4939-8bf7-56154fc7d199/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2023-11-19 05:15:04,480 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60a199c2-3833-4939-8bf7-56154fc7d199/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:15:04,481 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 05:15:04,482 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:15:04,482 INFO L85 PathProgramCache]: Analyzing trace with hash 1912306438, now seen corresponding path program 2 times [2023-11-19 05:15:04,482 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:15:04,482 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1908775517] [2023-11-19 05:15:04,482 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:15:04,483 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:15:04,514 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:15:04,669 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 0 proven. 11 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2023-11-19 05:15:04,669 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:15:04,669 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1908775517] [2023-11-19 05:15:04,669 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1908775517] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 05:15:04,671 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [350659187] [2023-11-19 05:15:04,673 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-19 05:15:04,674 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:15:04,675 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60a199c2-3833-4939-8bf7-56154fc7d199/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 05:15:04,676 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60a199c2-3833-4939-8bf7-56154fc7d199/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 05:15:04,700 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60a199c2-3833-4939-8bf7-56154fc7d199/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-11-19 05:15:04,802 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2023-11-19 05:15:04,802 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-19 05:15:04,804 INFO L262 TraceCheckSpWp]: Trace formula consists of 111 conjuncts, 3 conjunts are in the unsatisfiable core [2023-11-19 05:15:04,806 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 05:15:04,818 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 10 proven. 1 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2023-11-19 05:15:04,819 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-19 05:15:04,853 INFO L134 CoverageAnalysis]: Checked inductivity of 32 backedges. 10 proven. 1 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2023-11-19 05:15:04,853 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [350659187] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-19 05:15:04,854 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1019002354] [2023-11-19 05:15:04,859 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2023-11-19 05:15:04,859 INFO L166 IcfgInterpreter]: Building call graph [2023-11-19 05:15:04,860 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-19 05:15:04,861 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-19 05:15:04,861 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-19 05:15:05,363 INFO L197 IcfgInterpreter]: Interpreting procedure sep with input of size 10 for LOIs [2023-11-19 05:15:05,448 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-19 05:15:05,828 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '793#(and (<= 1 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~ret2~0#1| 2147483647) (or (not (= |ULTIMATE.start_main_~ret2~0#1| |ULTIMATE.start_main_~ret~1#1|)) (not (= |ULTIMATE.start_main_~ret5~0#1| |ULTIMATE.start_main_~ret~1#1|))) (<= 0 (+ |ULTIMATE.start_main_~ret~1#1| 2147483648)) (<= 0 (+ |ULTIMATE.start_main_~ret5~0#1| 2147483648)) (<= |ULTIMATE.start_main_~ret~1#1| 2147483647) (<= 2 |ULTIMATE.start_main_~#x~0#1.base|) (= |ULTIMATE.start_main_~#x~0#1.offset| 0) (<= 0 (+ |ULTIMATE.start_main_~ret2~0#1| 2147483648)) (<= |ULTIMATE.start_main_~ret5~0#1| 2147483647))' at error location [2023-11-19 05:15:05,828 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-19 05:15:05,828 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-19 05:15:05,828 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 7 [2023-11-19 05:15:05,829 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1802882377] [2023-11-19 05:15:05,829 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-19 05:15:05,831 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-11-19 05:15:05,831 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:15:05,832 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-11-19 05:15:05,833 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=62, Invalid=235, Unknown=9, NotChecked=0, Total=306 [2023-11-19 05:15:05,833 INFO L87 Difference]: Start difference. First operand 21 states and 25 transitions. Second operand has 7 states, 7 states have (on average 3.5714285714285716) internal successors, (25), 7 states have internal predecessors, (25), 2 states have call successors, (5), 1 states have call predecessors, (5), 2 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) [2023-11-19 05:15:05,879 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:15:05,880 INFO L93 Difference]: Finished difference Result 38 states and 50 transitions. [2023-11-19 05:15:05,880 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-11-19 05:15:05,880 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 3.5714285714285716) internal successors, (25), 7 states have internal predecessors, (25), 2 states have call successors, (5), 1 states have call predecessors, (5), 2 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) Word has length 28 [2023-11-19 05:15:05,881 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:15:05,881 INFO L225 Difference]: With dead ends: 38 [2023-11-19 05:15:05,881 INFO L226 Difference]: Without dead ends: 24 [2023-11-19 05:15:05,885 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 86 GetRequests, 70 SyntacticMatches, 0 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 83 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=62, Invalid=235, Unknown=9, NotChecked=0, Total=306 [2023-11-19 05:15:05,887 INFO L413 NwaCegarLoop]: 12 mSDtfsCounter, 0 mSDsluCounter, 33 mSDsCounter, 0 mSdLazyCounter, 30 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 45 SdHoareTripleChecker+Invalid, 31 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 30 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-19 05:15:05,890 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 45 Invalid, 31 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 30 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-19 05:15:05,892 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2023-11-19 05:15:05,898 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2023-11-19 05:15:05,899 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 19 states have (on average 1.1578947368421053) internal successors, (22), 19 states have internal predecessors, (22), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-11-19 05:15:05,904 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 28 transitions. [2023-11-19 05:15:05,904 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 28 transitions. Word has length 28 [2023-11-19 05:15:05,905 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:15:05,905 INFO L495 AbstractCegarLoop]: Abstraction has 24 states and 28 transitions. [2023-11-19 05:15:05,905 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 3.5714285714285716) internal successors, (25), 7 states have internal predecessors, (25), 2 states have call successors, (5), 1 states have call predecessors, (5), 2 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) [2023-11-19 05:15:05,906 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 28 transitions. [2023-11-19 05:15:05,907 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2023-11-19 05:15:05,908 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:15:05,908 INFO L195 NwaCegarLoop]: trace histogram [12, 4, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 05:15:05,933 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60a199c2-3833-4939-8bf7-56154fc7d199/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2023-11-19 05:15:06,128 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60a199c2-3833-4939-8bf7-56154fc7d199/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:15:06,129 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 05:15:06,129 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:15:06,129 INFO L85 PathProgramCache]: Analyzing trace with hash -801027180, now seen corresponding path program 3 times [2023-11-19 05:15:06,129 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:15:06,129 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1067979282] [2023-11-19 05:15:06,129 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:15:06,130 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:15:06,167 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:15:06,288 INFO L134 CoverageAnalysis]: Checked inductivity of 122 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 121 trivial. 0 not checked. [2023-11-19 05:15:06,288 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:15:06,288 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1067979282] [2023-11-19 05:15:06,288 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1067979282] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 05:15:06,288 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1637838856] [2023-11-19 05:15:06,289 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-11-19 05:15:06,289 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:15:06,289 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60a199c2-3833-4939-8bf7-56154fc7d199/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 05:15:06,290 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60a199c2-3833-4939-8bf7-56154fc7d199/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 05:15:06,312 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60a199c2-3833-4939-8bf7-56154fc7d199/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-11-19 05:15:06,416 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-11-19 05:15:06,417 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-19 05:15:06,418 INFO L262 TraceCheckSpWp]: Trace formula consists of 211 conjuncts, 6 conjunts are in the unsatisfiable core [2023-11-19 05:15:06,421 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 05:15:06,474 INFO L134 CoverageAnalysis]: Checked inductivity of 122 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2023-11-19 05:15:06,474 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-19 05:15:06,564 INFO L134 CoverageAnalysis]: Checked inductivity of 122 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 112 trivial. 0 not checked. [2023-11-19 05:15:06,564 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1637838856] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-19 05:15:06,565 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1245598123] [2023-11-19 05:15:06,567 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2023-11-19 05:15:06,567 INFO L166 IcfgInterpreter]: Building call graph [2023-11-19 05:15:06,568 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-19 05:15:06,568 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-19 05:15:06,568 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-19 05:15:06,976 INFO L197 IcfgInterpreter]: Interpreting procedure sep with input of size 10 for LOIs [2023-11-19 05:15:07,038 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-19 05:15:07,393 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1135#(and (<= 1 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~ret2~0#1| 2147483647) (or (not (= |ULTIMATE.start_main_~ret2~0#1| |ULTIMATE.start_main_~ret~1#1|)) (not (= |ULTIMATE.start_main_~ret5~0#1| |ULTIMATE.start_main_~ret~1#1|))) (<= 0 (+ |ULTIMATE.start_main_~ret~1#1| 2147483648)) (<= 0 (+ |ULTIMATE.start_main_~ret5~0#1| 2147483648)) (<= |ULTIMATE.start_main_~ret~1#1| 2147483647) (<= 2 |ULTIMATE.start_main_~#x~0#1.base|) (= |ULTIMATE.start_main_~#x~0#1.offset| 0) (<= 0 (+ |ULTIMATE.start_main_~ret2~0#1| 2147483648)) (<= |ULTIMATE.start_main_~ret5~0#1| 2147483647))' at error location [2023-11-19 05:15:07,393 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-19 05:15:07,394 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-19 05:15:07,394 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 6, 7] total 14 [2023-11-19 05:15:07,394 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [281258390] [2023-11-19 05:15:07,394 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-19 05:15:07,395 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2023-11-19 05:15:07,395 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:15:07,396 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2023-11-19 05:15:07,396 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=112, Invalid=479, Unknown=9, NotChecked=0, Total=600 [2023-11-19 05:15:07,397 INFO L87 Difference]: Start difference. First operand 24 states and 28 transitions. Second operand has 14 states, 14 states have (on average 2.2857142857142856) internal successors, (32), 14 states have internal predecessors, (32), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) [2023-11-19 05:15:07,446 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:15:07,447 INFO L93 Difference]: Finished difference Result 49 states and 63 transitions. [2023-11-19 05:15:07,447 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2023-11-19 05:15:07,448 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 14 states have (on average 2.2857142857142856) internal successors, (32), 14 states have internal predecessors, (32), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) Word has length 37 [2023-11-19 05:15:07,448 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:15:07,448 INFO L225 Difference]: With dead ends: 49 [2023-11-19 05:15:07,448 INFO L226 Difference]: Without dead ends: 31 [2023-11-19 05:15:07,449 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 113 GetRequests, 90 SyntacticMatches, 0 SemanticMatches, 23 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 177 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=112, Invalid=479, Unknown=9, NotChecked=0, Total=600 [2023-11-19 05:15:07,450 INFO L413 NwaCegarLoop]: 12 mSDtfsCounter, 0 mSDsluCounter, 47 mSDsCounter, 0 mSdLazyCounter, 40 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 59 SdHoareTripleChecker+Invalid, 41 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 40 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-19 05:15:07,451 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 59 Invalid, 41 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 40 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-19 05:15:07,451 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2023-11-19 05:15:07,456 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 31. [2023-11-19 05:15:07,456 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 31 states, 26 states have (on average 1.1153846153846154) internal successors, (29), 26 states have internal predecessors, (29), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-11-19 05:15:07,457 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 35 transitions. [2023-11-19 05:15:07,457 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 35 transitions. Word has length 37 [2023-11-19 05:15:07,458 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:15:07,458 INFO L495 AbstractCegarLoop]: Abstraction has 31 states and 35 transitions. [2023-11-19 05:15:07,458 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 14 states have (on average 2.2857142857142856) internal successors, (32), 14 states have internal predecessors, (32), 2 states have call successors, (8), 2 states have call predecessors, (8), 2 states have return successors, (8), 2 states have call predecessors, (8), 2 states have call successors, (8) [2023-11-19 05:15:07,458 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 35 transitions. [2023-11-19 05:15:07,459 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 45 [2023-11-19 05:15:07,460 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:15:07,460 INFO L195 NwaCegarLoop]: trace histogram [12, 10, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 05:15:07,485 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60a199c2-3833-4939-8bf7-56154fc7d199/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2023-11-19 05:15:07,679 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60a199c2-3833-4939-8bf7-56154fc7d199/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2023-11-19 05:15:07,679 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 05:15:07,679 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:15:07,679 INFO L85 PathProgramCache]: Analyzing trace with hash -590704388, now seen corresponding path program 4 times [2023-11-19 05:15:07,680 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:15:07,680 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2007473976] [2023-11-19 05:15:07,680 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:15:07,680 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:15:07,728 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:15:08,086 INFO L134 CoverageAnalysis]: Checked inductivity of 169 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 114 trivial. 0 not checked. [2023-11-19 05:15:08,086 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:15:08,087 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2007473976] [2023-11-19 05:15:08,087 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2007473976] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 05:15:08,087 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1671369365] [2023-11-19 05:15:08,090 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-11-19 05:15:08,090 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:15:08,090 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60a199c2-3833-4939-8bf7-56154fc7d199/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 05:15:08,091 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60a199c2-3833-4939-8bf7-56154fc7d199/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 05:15:08,116 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60a199c2-3833-4939-8bf7-56154fc7d199/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2023-11-19 05:15:08,224 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:15:08,226 INFO L262 TraceCheckSpWp]: Trace formula consists of 272 conjuncts, 12 conjunts are in the unsatisfiable core [2023-11-19 05:15:08,233 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 05:15:08,287 INFO L134 CoverageAnalysis]: Checked inductivity of 169 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 114 trivial. 0 not checked. [2023-11-19 05:15:08,289 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-19 05:15:08,574 INFO L134 CoverageAnalysis]: Checked inductivity of 169 backedges. 0 proven. 55 refuted. 0 times theorem prover too weak. 114 trivial. 0 not checked. [2023-11-19 05:15:08,574 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1671369365] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-19 05:15:08,574 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2025467103] [2023-11-19 05:15:08,577 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2023-11-19 05:15:08,577 INFO L166 IcfgInterpreter]: Building call graph [2023-11-19 05:15:08,578 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-19 05:15:08,578 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-19 05:15:08,578 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-19 05:15:09,024 INFO L197 IcfgInterpreter]: Interpreting procedure sep with input of size 10 for LOIs [2023-11-19 05:15:09,097 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-19 05:15:09,557 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1566#(and (<= 1 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~ret2~0#1| 2147483647) (or (not (= |ULTIMATE.start_main_~ret2~0#1| |ULTIMATE.start_main_~ret~1#1|)) (not (= |ULTIMATE.start_main_~ret5~0#1| |ULTIMATE.start_main_~ret~1#1|))) (<= 0 (+ |ULTIMATE.start_main_~ret~1#1| 2147483648)) (<= 0 (+ |ULTIMATE.start_main_~ret5~0#1| 2147483648)) (<= |ULTIMATE.start_main_~ret~1#1| 2147483647) (<= 2 |ULTIMATE.start_main_~#x~0#1.base|) (= |ULTIMATE.start_main_~#x~0#1.offset| 0) (<= 0 (+ |ULTIMATE.start_main_~ret2~0#1| 2147483648)) (<= |ULTIMATE.start_main_~ret5~0#1| 2147483647))' at error location [2023-11-19 05:15:09,557 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-19 05:15:09,557 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-19 05:15:09,558 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 12, 13] total 25 [2023-11-19 05:15:09,558 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [586601324] [2023-11-19 05:15:09,558 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-19 05:15:09,559 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2023-11-19 05:15:09,559 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:15:09,560 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2023-11-19 05:15:09,561 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=341, Invalid=910, Unknown=9, NotChecked=0, Total=1260 [2023-11-19 05:15:09,562 INFO L87 Difference]: Start difference. First operand 31 states and 35 transitions. Second operand has 25 states, 25 states have (on average 1.56) internal successors, (39), 25 states have internal predecessors, (39), 1 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (6), 1 states have call predecessors, (6), 1 states have call successors, (6) [2023-11-19 05:15:09,647 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:15:09,647 INFO L93 Difference]: Finished difference Result 62 states and 81 transitions. [2023-11-19 05:15:09,648 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2023-11-19 05:15:09,650 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 1.56) internal successors, (39), 25 states have internal predecessors, (39), 1 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (6), 1 states have call predecessors, (6), 1 states have call successors, (6) Word has length 44 [2023-11-19 05:15:09,651 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:15:09,655 INFO L225 Difference]: With dead ends: 62 [2023-11-19 05:15:09,655 INFO L226 Difference]: Without dead ends: 43 [2023-11-19 05:15:09,657 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 143 GetRequests, 109 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 416 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=341, Invalid=910, Unknown=9, NotChecked=0, Total=1260 [2023-11-19 05:15:09,658 INFO L413 NwaCegarLoop]: 12 mSDtfsCounter, 0 mSDsluCounter, 36 mSDsCounter, 0 mSdLazyCounter, 44 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 48 SdHoareTripleChecker+Invalid, 45 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 44 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-19 05:15:09,658 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 48 Invalid, 45 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 44 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-19 05:15:09,659 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 43 states. [2023-11-19 05:15:09,670 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 43 to 43. [2023-11-19 05:15:09,671 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 43 states, 38 states have (on average 1.0789473684210527) internal successors, (41), 38 states have internal predecessors, (41), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-11-19 05:15:09,672 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 43 states to 43 states and 47 transitions. [2023-11-19 05:15:09,672 INFO L78 Accepts]: Start accepts. Automaton has 43 states and 47 transitions. Word has length 44 [2023-11-19 05:15:09,672 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:15:09,673 INFO L495 AbstractCegarLoop]: Abstraction has 43 states and 47 transitions. [2023-11-19 05:15:09,673 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 25 states have (on average 1.56) internal successors, (39), 25 states have internal predecessors, (39), 1 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (6), 1 states have call predecessors, (6), 1 states have call successors, (6) [2023-11-19 05:15:09,673 INFO L276 IsEmpty]: Start isEmpty. Operand 43 states and 47 transitions. [2023-11-19 05:15:09,675 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 57 [2023-11-19 05:15:09,675 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:15:09,676 INFO L195 NwaCegarLoop]: trace histogram [22, 12, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 05:15:09,707 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60a199c2-3833-4939-8bf7-56154fc7d199/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2023-11-19 05:15:09,901 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60a199c2-3833-4939-8bf7-56154fc7d199/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:15:09,901 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 05:15:09,902 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:15:09,902 INFO L85 PathProgramCache]: Analyzing trace with hash -1244615428, now seen corresponding path program 5 times [2023-11-19 05:15:09,902 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:15:09,902 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [673334348] [2023-11-19 05:15:09,903 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:15:09,903 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:15:09,977 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:15:11,021 INFO L134 CoverageAnalysis]: Checked inductivity of 367 backedges. 0 proven. 253 refuted. 0 times theorem prover too weak. 114 trivial. 0 not checked. [2023-11-19 05:15:11,021 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:15:11,022 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [673334348] [2023-11-19 05:15:11,022 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [673334348] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 05:15:11,022 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [728306217] [2023-11-19 05:15:11,022 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-19 05:15:11,023 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:15:11,023 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60a199c2-3833-4939-8bf7-56154fc7d199/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 05:15:11,024 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60a199c2-3833-4939-8bf7-56154fc7d199/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 05:15:11,047 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60a199c2-3833-4939-8bf7-56154fc7d199/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2023-11-19 05:15:11,200 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2023-11-19 05:15:11,200 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-19 05:15:11,202 INFO L262 TraceCheckSpWp]: Trace formula consists of 163 conjuncts, 6 conjunts are in the unsatisfiable core [2023-11-19 05:15:11,206 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 05:15:11,328 INFO L134 CoverageAnalysis]: Checked inductivity of 367 backedges. 52 proven. 10 refuted. 0 times theorem prover too weak. 305 trivial. 0 not checked. [2023-11-19 05:15:11,328 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-19 05:15:11,500 INFO L134 CoverageAnalysis]: Checked inductivity of 367 backedges. 52 proven. 10 refuted. 0 times theorem prover too weak. 305 trivial. 0 not checked. [2023-11-19 05:15:11,500 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [728306217] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-19 05:15:11,500 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1977220067] [2023-11-19 05:15:11,504 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2023-11-19 05:15:11,504 INFO L166 IcfgInterpreter]: Building call graph [2023-11-19 05:15:11,505 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-19 05:15:11,505 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-19 05:15:11,505 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-19 05:15:11,916 INFO L197 IcfgInterpreter]: Interpreting procedure sep with input of size 10 for LOIs [2023-11-19 05:15:11,976 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-19 05:15:12,617 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2129#(and (<= 1 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~ret2~0#1| 2147483647) (or (not (= |ULTIMATE.start_main_~ret2~0#1| |ULTIMATE.start_main_~ret~1#1|)) (not (= |ULTIMATE.start_main_~ret5~0#1| |ULTIMATE.start_main_~ret~1#1|))) (<= 0 (+ |ULTIMATE.start_main_~ret~1#1| 2147483648)) (<= 0 (+ |ULTIMATE.start_main_~ret5~0#1| 2147483648)) (<= |ULTIMATE.start_main_~ret~1#1| 2147483647) (<= 2 |ULTIMATE.start_main_~#x~0#1.base|) (= |ULTIMATE.start_main_~#x~0#1.offset| 0) (<= 0 (+ |ULTIMATE.start_main_~ret2~0#1| 2147483648)) (<= |ULTIMATE.start_main_~ret5~0#1| 2147483647))' at error location [2023-11-19 05:15:12,618 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-19 05:15:12,618 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-19 05:15:12,618 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 7, 7] total 35 [2023-11-19 05:15:12,618 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [497069334] [2023-11-19 05:15:12,618 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-19 05:15:12,619 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 35 states [2023-11-19 05:15:12,619 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:15:12,620 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 35 interpolants. [2023-11-19 05:15:12,622 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=406, Invalid=1655, Unknown=9, NotChecked=0, Total=2070 [2023-11-19 05:15:12,622 INFO L87 Difference]: Start difference. First operand 43 states and 47 transitions. Second operand has 35 states, 35 states have (on average 1.5142857142857142) internal successors, (53), 35 states have internal predecessors, (53), 2 states have call successors, (6), 1 states have call predecessors, (6), 2 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) [2023-11-19 05:15:12,758 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:15:12,758 INFO L93 Difference]: Finished difference Result 69 states and 86 transitions. [2023-11-19 05:15:12,759 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 35 states. [2023-11-19 05:15:12,760 INFO L78 Accepts]: Start accepts. Automaton has has 35 states, 35 states have (on average 1.5142857142857142) internal successors, (53), 35 states have internal predecessors, (53), 2 states have call successors, (6), 1 states have call predecessors, (6), 2 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) Word has length 56 [2023-11-19 05:15:12,760 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:15:12,761 INFO L225 Difference]: With dead ends: 69 [2023-11-19 05:15:12,761 INFO L226 Difference]: Without dead ends: 50 [2023-11-19 05:15:12,763 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 191 GetRequests, 147 SyntacticMatches, 0 SemanticMatches, 44 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 618 ImplicationChecksByTransitivity, 1.2s TimeCoverageRelationStatistics Valid=406, Invalid=1655, Unknown=9, NotChecked=0, Total=2070 [2023-11-19 05:15:12,764 INFO L413 NwaCegarLoop]: 12 mSDtfsCounter, 0 mSDsluCounter, 91 mSDsCounter, 0 mSdLazyCounter, 85 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 103 SdHoareTripleChecker+Invalid, 86 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 85 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-19 05:15:12,765 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 103 Invalid, 86 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 85 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-19 05:15:12,766 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 50 states. [2023-11-19 05:15:12,774 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 50 to 50. [2023-11-19 05:15:12,774 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 50 states, 45 states have (on average 1.0666666666666667) internal successors, (48), 45 states have internal predecessors, (48), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-11-19 05:15:12,777 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 50 states to 50 states and 54 transitions. [2023-11-19 05:15:12,778 INFO L78 Accepts]: Start accepts. Automaton has 50 states and 54 transitions. Word has length 56 [2023-11-19 05:15:12,778 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:15:12,779 INFO L495 AbstractCegarLoop]: Abstraction has 50 states and 54 transitions. [2023-11-19 05:15:12,779 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 35 states, 35 states have (on average 1.5142857142857142) internal successors, (53), 35 states have internal predecessors, (53), 2 states have call successors, (6), 1 states have call predecessors, (6), 2 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) [2023-11-19 05:15:12,779 INFO L276 IsEmpty]: Start isEmpty. Operand 50 states and 54 transitions. [2023-11-19 05:15:12,782 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 76 [2023-11-19 05:15:12,783 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:15:12,783 INFO L195 NwaCegarLoop]: trace histogram [30, 23, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 05:15:12,815 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60a199c2-3833-4939-8bf7-56154fc7d199/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2023-11-19 05:15:12,998 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60a199c2-3833-4939-8bf7-56154fc7d199/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable7 [2023-11-19 05:15:12,999 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 05:15:12,999 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:15:12,999 INFO L85 PathProgramCache]: Analyzing trace with hash 523460620, now seen corresponding path program 6 times [2023-11-19 05:15:12,999 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:15:13,000 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [394848879] [2023-11-19 05:15:13,000 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:15:13,000 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:15:13,117 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:15:14,620 INFO L134 CoverageAnalysis]: Checked inductivity of 813 backedges. 0 proven. 276 refuted. 0 times theorem prover too weak. 537 trivial. 0 not checked. [2023-11-19 05:15:14,620 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:15:14,621 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [394848879] [2023-11-19 05:15:14,621 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [394848879] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 05:15:14,621 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [904260210] [2023-11-19 05:15:14,621 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-11-19 05:15:14,621 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:15:14,621 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60a199c2-3833-4939-8bf7-56154fc7d199/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 05:15:14,625 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60a199c2-3833-4939-8bf7-56154fc7d199/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 05:15:14,644 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60a199c2-3833-4939-8bf7-56154fc7d199/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2023-11-19 05:15:14,851 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-11-19 05:15:14,852 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-19 05:15:14,856 INFO L262 TraceCheckSpWp]: Trace formula consists of 461 conjuncts, 25 conjunts are in the unsatisfiable core [2023-11-19 05:15:14,860 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 05:15:14,931 INFO L134 CoverageAnalysis]: Checked inductivity of 813 backedges. 0 proven. 276 refuted. 0 times theorem prover too weak. 537 trivial. 0 not checked. [2023-11-19 05:15:14,931 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-19 05:15:15,872 INFO L134 CoverageAnalysis]: Checked inductivity of 813 backedges. 0 proven. 276 refuted. 0 times theorem prover too weak. 537 trivial. 0 not checked. [2023-11-19 05:15:15,873 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [904260210] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-19 05:15:15,873 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1491731486] [2023-11-19 05:15:15,875 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2023-11-19 05:15:15,876 INFO L166 IcfgInterpreter]: Building call graph [2023-11-19 05:15:15,876 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-19 05:15:15,876 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-19 05:15:15,877 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-19 05:15:16,207 INFO L197 IcfgInterpreter]: Interpreting procedure sep with input of size 10 for LOIs [2023-11-19 05:15:16,312 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-19 05:15:16,888 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2842#(and (<= 1 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~ret2~0#1| 2147483647) (or (not (= |ULTIMATE.start_main_~ret2~0#1| |ULTIMATE.start_main_~ret~1#1|)) (not (= |ULTIMATE.start_main_~ret5~0#1| |ULTIMATE.start_main_~ret~1#1|))) (<= 0 (+ |ULTIMATE.start_main_~ret~1#1| 2147483648)) (<= 0 (+ |ULTIMATE.start_main_~ret5~0#1| 2147483648)) (<= |ULTIMATE.start_main_~ret~1#1| 2147483647) (<= 2 |ULTIMATE.start_main_~#x~0#1.base|) (= |ULTIMATE.start_main_~#x~0#1.offset| 0) (<= 0 (+ |ULTIMATE.start_main_~ret2~0#1| 2147483648)) (<= |ULTIMATE.start_main_~ret5~0#1| 2147483647))' at error location [2023-11-19 05:15:16,888 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-19 05:15:16,888 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-19 05:15:16,889 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 25, 26] total 43 [2023-11-19 05:15:16,889 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1893957706] [2023-11-19 05:15:16,889 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-19 05:15:16,895 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 43 states [2023-11-19 05:15:16,895 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:15:16,896 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2023-11-19 05:15:16,898 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=944, Invalid=1909, Unknown=9, NotChecked=0, Total=2862 [2023-11-19 05:15:16,898 INFO L87 Difference]: Start difference. First operand 50 states and 54 transitions. Second operand has 43 states, 43 states have (on average 1.3488372093023255) internal successors, (58), 43 states have internal predecessors, (58), 1 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (6), 1 states have call predecessors, (6), 1 states have call successors, (6) [2023-11-19 05:15:16,988 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:15:16,988 INFO L93 Difference]: Finished difference Result 92 states and 116 transitions. [2023-11-19 05:15:16,989 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2023-11-19 05:15:16,989 INFO L78 Accepts]: Start accepts. Automaton has has 43 states, 43 states have (on average 1.3488372093023255) internal successors, (58), 43 states have internal predecessors, (58), 1 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (6), 1 states have call predecessors, (6), 1 states have call successors, (6) Word has length 75 [2023-11-19 05:15:16,989 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:15:16,990 INFO L225 Difference]: With dead ends: 92 [2023-11-19 05:15:16,990 INFO L226 Difference]: Without dead ends: 67 [2023-11-19 05:15:16,992 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 249 GetRequests, 189 SyntacticMatches, 8 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 877 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=944, Invalid=1909, Unknown=9, NotChecked=0, Total=2862 [2023-11-19 05:15:16,993 INFO L413 NwaCegarLoop]: 12 mSDtfsCounter, 0 mSDsluCounter, 48 mSDsCounter, 0 mSdLazyCounter, 67 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 60 SdHoareTripleChecker+Invalid, 67 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 67 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-19 05:15:16,994 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 60 Invalid, 67 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 67 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-19 05:15:16,995 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 67 states. [2023-11-19 05:15:17,002 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 67 to 67. [2023-11-19 05:15:17,002 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 67 states, 62 states have (on average 1.0483870967741935) internal successors, (65), 62 states have internal predecessors, (65), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-11-19 05:15:17,003 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 71 transitions. [2023-11-19 05:15:17,003 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 71 transitions. Word has length 75 [2023-11-19 05:15:17,004 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:15:17,004 INFO L495 AbstractCegarLoop]: Abstraction has 67 states and 71 transitions. [2023-11-19 05:15:17,004 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 43 states, 43 states have (on average 1.3488372093023255) internal successors, (58), 43 states have internal predecessors, (58), 1 states have call successors, (6), 2 states have call predecessors, (6), 2 states have return successors, (6), 1 states have call predecessors, (6), 1 states have call successors, (6) [2023-11-19 05:15:17,004 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 71 transitions. [2023-11-19 05:15:17,006 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 93 [2023-11-19 05:15:17,006 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:15:17,006 INFO L195 NwaCegarLoop]: trace histogram [40, 30, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 05:15:17,035 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60a199c2-3833-4939-8bf7-56154fc7d199/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Forceful destruction successful, exit code 0 [2023-11-19 05:15:17,230 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 9 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60a199c2-3833-4939-8bf7-56154fc7d199/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable8 [2023-11-19 05:15:17,230 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 05:15:17,231 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:15:17,231 INFO L85 PathProgramCache]: Analyzing trace with hash -1299840708, now seen corresponding path program 7 times [2023-11-19 05:15:17,231 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:15:17,231 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2009735797] [2023-11-19 05:15:17,231 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:15:17,231 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:15:17,357 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:15:18,082 INFO L134 CoverageAnalysis]: Checked inductivity of 1357 backedges. 0 proven. 299 refuted. 0 times theorem prover too weak. 1058 trivial. 0 not checked. [2023-11-19 05:15:18,084 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:15:18,084 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2009735797] [2023-11-19 05:15:18,084 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2009735797] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 05:15:18,084 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [35586314] [2023-11-19 05:15:18,085 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-11-19 05:15:18,085 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:15:18,085 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60a199c2-3833-4939-8bf7-56154fc7d199/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 05:15:18,089 INFO L229 MonitoredProcess]: Starting monitored process 10 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60a199c2-3833-4939-8bf7-56154fc7d199/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 05:15:18,097 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60a199c2-3833-4939-8bf7-56154fc7d199/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Waiting until timeout for monitored process [2023-11-19 05:15:18,360 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:15:18,363 INFO L262 TraceCheckSpWp]: Trace formula consists of 614 conjuncts, 12 conjunts are in the unsatisfiable core [2023-11-19 05:15:18,366 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 05:15:18,411 INFO L134 CoverageAnalysis]: Checked inductivity of 1357 backedges. 244 proven. 55 refuted. 0 times theorem prover too weak. 1058 trivial. 0 not checked. [2023-11-19 05:15:18,411 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-19 05:15:18,693 INFO L134 CoverageAnalysis]: Checked inductivity of 1357 backedges. 0 proven. 299 refuted. 0 times theorem prover too weak. 1058 trivial. 0 not checked. [2023-11-19 05:15:18,693 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [35586314] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-19 05:15:18,693 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [87726655] [2023-11-19 05:15:18,696 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2023-11-19 05:15:18,696 INFO L166 IcfgInterpreter]: Building call graph [2023-11-19 05:15:18,697 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-19 05:15:18,697 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-19 05:15:18,697 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-19 05:15:19,020 INFO L197 IcfgInterpreter]: Interpreting procedure sep with input of size 10 for LOIs [2023-11-19 05:15:19,094 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-19 05:15:19,550 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3719#(and (<= 1 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~ret2~0#1| 2147483647) (or (not (= |ULTIMATE.start_main_~ret2~0#1| |ULTIMATE.start_main_~ret~1#1|)) (not (= |ULTIMATE.start_main_~ret5~0#1| |ULTIMATE.start_main_~ret~1#1|))) (<= 0 (+ |ULTIMATE.start_main_~ret~1#1| 2147483648)) (<= 0 (+ |ULTIMATE.start_main_~ret5~0#1| 2147483648)) (<= |ULTIMATE.start_main_~ret~1#1| 2147483647) (<= 2 |ULTIMATE.start_main_~#x~0#1.base|) (= |ULTIMATE.start_main_~#x~0#1.offset| 0) (<= 0 (+ |ULTIMATE.start_main_~ret2~0#1| 2147483648)) (<= |ULTIMATE.start_main_~ret5~0#1| 2147483647))' at error location [2023-11-19 05:15:19,550 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-19 05:15:19,550 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-19 05:15:19,551 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13, 13] total 25 [2023-11-19 05:15:19,551 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [764403971] [2023-11-19 05:15:19,551 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-19 05:15:19,551 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2023-11-19 05:15:19,552 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:15:19,553 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2023-11-19 05:15:19,554 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=341, Invalid=910, Unknown=9, NotChecked=0, Total=1260 [2023-11-19 05:15:19,554 INFO L87 Difference]: Start difference. First operand 67 states and 71 transitions. Second operand has 25 states, 25 states have (on average 1.68) internal successors, (42), 25 states have internal predecessors, (42), 2 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (5), 1 states have call predecessors, (5), 2 states have call successors, (5) [2023-11-19 05:15:19,625 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:15:19,626 INFO L93 Difference]: Finished difference Result 103 states and 124 transitions. [2023-11-19 05:15:19,631 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 24 states. [2023-11-19 05:15:19,632 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 25 states have (on average 1.68) internal successors, (42), 25 states have internal predecessors, (42), 2 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (5), 1 states have call predecessors, (5), 2 states have call successors, (5) Word has length 92 [2023-11-19 05:15:19,632 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:15:19,633 INFO L225 Difference]: With dead ends: 103 [2023-11-19 05:15:19,634 INFO L226 Difference]: Without dead ends: 79 [2023-11-19 05:15:19,641 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 287 GetRequests, 253 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 416 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=341, Invalid=910, Unknown=9, NotChecked=0, Total=1260 [2023-11-19 05:15:19,642 INFO L413 NwaCegarLoop]: 12 mSDtfsCounter, 0 mSDsluCounter, 44 mSDsCounter, 0 mSdLazyCounter, 54 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 56 SdHoareTripleChecker+Invalid, 55 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 54 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-19 05:15:19,643 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 56 Invalid, 55 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 54 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-19 05:15:19,645 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2023-11-19 05:15:19,653 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 79. [2023-11-19 05:15:19,661 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 79 states, 74 states have (on average 1.0405405405405406) internal successors, (77), 74 states have internal predecessors, (77), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-11-19 05:15:19,662 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 83 transitions. [2023-11-19 05:15:19,664 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 83 transitions. Word has length 92 [2023-11-19 05:15:19,665 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:15:19,665 INFO L495 AbstractCegarLoop]: Abstraction has 79 states and 83 transitions. [2023-11-19 05:15:19,665 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 25 states have (on average 1.68) internal successors, (42), 25 states have internal predecessors, (42), 2 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (5), 1 states have call predecessors, (5), 2 states have call successors, (5) [2023-11-19 05:15:19,665 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 83 transitions. [2023-11-19 05:15:19,668 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 129 [2023-11-19 05:15:19,676 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:15:19,676 INFO L195 NwaCegarLoop]: trace histogram [66, 40, 3, 3, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 05:15:19,706 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60a199c2-3833-4939-8bf7-56154fc7d199/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (10)] Forceful destruction successful, exit code 0 [2023-11-19 05:15:19,877 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 10 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60a199c2-3833-4939-8bf7-56154fc7d199/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2023-11-19 05:15:19,877 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 05:15:19,878 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:15:19,878 INFO L85 PathProgramCache]: Analyzing trace with hash 1377224124, now seen corresponding path program 8 times [2023-11-19 05:15:19,878 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:15:19,878 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [269701271] [2023-11-19 05:15:19,878 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:15:19,878 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:15:20,084 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:15:22,059 INFO L134 CoverageAnalysis]: Checked inductivity of 3175 backedges. 0 proven. 1313 refuted. 0 times theorem prover too weak. 1862 trivial. 0 not checked. [2023-11-19 05:15:22,060 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:15:22,060 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [269701271] [2023-11-19 05:15:22,060 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [269701271] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 05:15:22,060 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [44676004] [2023-11-19 05:15:22,060 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-19 05:15:22,061 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:15:22,061 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60a199c2-3833-4939-8bf7-56154fc7d199/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 05:15:22,065 INFO L229 MonitoredProcess]: Starting monitored process 11 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60a199c2-3833-4939-8bf7-56154fc7d199/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 05:15:22,094 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60a199c2-3833-4939-8bf7-56154fc7d199/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Waiting until timeout for monitored process [2023-11-19 05:15:22,313 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2023-11-19 05:15:22,314 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-19 05:15:22,316 INFO L262 TraceCheckSpWp]: Trace formula consists of 163 conjuncts, 4 conjunts are in the unsatisfiable core [2023-11-19 05:15:22,321 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 05:15:22,375 INFO L134 CoverageAnalysis]: Checked inductivity of 3175 backedges. 1062 proven. 3 refuted. 0 times theorem prover too weak. 2110 trivial. 0 not checked. [2023-11-19 05:15:22,376 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-19 05:15:22,460 INFO L134 CoverageAnalysis]: Checked inductivity of 3175 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 3172 trivial. 0 not checked. [2023-11-19 05:15:22,460 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [44676004] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-19 05:15:22,461 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [558880834] [2023-11-19 05:15:22,464 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2023-11-19 05:15:22,465 INFO L166 IcfgInterpreter]: Building call graph [2023-11-19 05:15:22,465 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-19 05:15:22,465 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-19 05:15:22,466 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-19 05:15:22,816 INFO L197 IcfgInterpreter]: Interpreting procedure sep with input of size 10 for LOIs [2023-11-19 05:15:22,894 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-19 05:15:23,481 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '4864#(and (<= 1 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~ret2~0#1| 2147483647) (or (not (= |ULTIMATE.start_main_~ret2~0#1| |ULTIMATE.start_main_~ret~1#1|)) (not (= |ULTIMATE.start_main_~ret5~0#1| |ULTIMATE.start_main_~ret~1#1|))) (<= 0 (+ |ULTIMATE.start_main_~ret~1#1| 2147483648)) (<= 0 (+ |ULTIMATE.start_main_~ret5~0#1| 2147483648)) (<= |ULTIMATE.start_main_~ret~1#1| 2147483647) (<= 2 |ULTIMATE.start_main_~#x~0#1.base|) (= |ULTIMATE.start_main_~#x~0#1.offset| 0) (<= 0 (+ |ULTIMATE.start_main_~ret2~0#1| 2147483648)) (<= |ULTIMATE.start_main_~ret5~0#1| 2147483647))' at error location [2023-11-19 05:15:23,481 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-19 05:15:23,482 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-19 05:15:23,482 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [25, 5, 5] total 31 [2023-11-19 05:15:23,482 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1899527103] [2023-11-19 05:15:23,482 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-19 05:15:23,483 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 31 states [2023-11-19 05:15:23,483 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:15:23,484 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 31 interpolants. [2023-11-19 05:15:23,485 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=368, Invalid=1345, Unknown=9, NotChecked=0, Total=1722 [2023-11-19 05:15:23,486 INFO L87 Difference]: Start difference. First operand 79 states and 83 transitions. Second operand has 31 states, 31 states have (on average 1.5806451612903225) internal successors, (49), 31 states have internal predecessors, (49), 2 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) [2023-11-19 05:15:23,583 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:15:23,583 INFO L93 Difference]: Finished difference Result 120 states and 134 transitions. [2023-11-19 05:15:23,584 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 31 states. [2023-11-19 05:15:23,584 INFO L78 Accepts]: Start accepts. Automaton has has 31 states, 31 states have (on average 1.5806451612903225) internal successors, (49), 31 states have internal predecessors, (49), 2 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) Word has length 128 [2023-11-19 05:15:23,585 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:15:23,588 INFO L225 Difference]: With dead ends: 120 [2023-11-19 05:15:23,589 INFO L226 Difference]: Without dead ends: 84 [2023-11-19 05:15:23,591 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 407 GetRequests, 367 SyntacticMatches, 0 SemanticMatches, 40 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 464 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=368, Invalid=1345, Unknown=9, NotChecked=0, Total=1722 [2023-11-19 05:15:23,593 INFO L413 NwaCegarLoop]: 12 mSDtfsCounter, 0 mSDsluCounter, 77 mSDsCounter, 0 mSdLazyCounter, 78 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 89 SdHoareTripleChecker+Invalid, 79 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 78 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-19 05:15:23,593 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 89 Invalid, 79 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 78 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-19 05:15:23,595 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2023-11-19 05:15:23,612 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 84. [2023-11-19 05:15:23,613 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 84 states, 79 states have (on average 1.0379746835443038) internal successors, (82), 79 states have internal predecessors, (82), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-11-19 05:15:23,614 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 84 states to 84 states and 88 transitions. [2023-11-19 05:15:23,614 INFO L78 Accepts]: Start accepts. Automaton has 84 states and 88 transitions. Word has length 128 [2023-11-19 05:15:23,615 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:15:23,615 INFO L495 AbstractCegarLoop]: Abstraction has 84 states and 88 transitions. [2023-11-19 05:15:23,615 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 31 states, 31 states have (on average 1.5806451612903225) internal successors, (49), 31 states have internal predecessors, (49), 2 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (6), 2 states have call predecessors, (6), 2 states have call successors, (6) [2023-11-19 05:15:23,615 INFO L276 IsEmpty]: Start isEmpty. Operand 84 states and 88 transitions. [2023-11-19 05:15:23,617 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 136 [2023-11-19 05:15:23,617 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:15:23,618 INFO L195 NwaCegarLoop]: trace histogram [69, 40, 6, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 05:15:23,644 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60a199c2-3833-4939-8bf7-56154fc7d199/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (11)] Forceful destruction successful, exit code 0 [2023-11-19 05:15:23,839 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,11 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60a199c2-3833-4939-8bf7-56154fc7d199/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:15:23,839 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 05:15:23,839 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:15:23,840 INFO L85 PathProgramCache]: Analyzing trace with hash -642303830, now seen corresponding path program 9 times [2023-11-19 05:15:23,840 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:15:23,840 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1270396923] [2023-11-19 05:15:23,840 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:15:23,840 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:15:24,029 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:15:25,927 INFO L134 CoverageAnalysis]: Checked inductivity of 3403 backedges. 0 proven. 1430 refuted. 0 times theorem prover too weak. 1973 trivial. 0 not checked. [2023-11-19 05:15:25,928 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:15:25,928 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1270396923] [2023-11-19 05:15:25,928 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1270396923] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 05:15:25,928 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1522850997] [2023-11-19 05:15:25,928 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-11-19 05:15:25,929 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:15:25,929 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60a199c2-3833-4939-8bf7-56154fc7d199/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 05:15:25,930 INFO L229 MonitoredProcess]: Starting monitored process 12 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60a199c2-3833-4939-8bf7-56154fc7d199/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 05:15:25,962 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60a199c2-3833-4939-8bf7-56154fc7d199/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Waiting until timeout for monitored process [2023-11-19 05:15:26,330 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-11-19 05:15:26,330 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-19 05:15:26,337 INFO L262 TraceCheckSpWp]: Trace formula consists of 798 conjuncts, 25 conjunts are in the unsatisfiable core [2023-11-19 05:15:26,342 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 05:15:26,406 INFO L134 CoverageAnalysis]: Checked inductivity of 3403 backedges. 1154 proven. 276 refuted. 0 times theorem prover too weak. 1973 trivial. 0 not checked. [2023-11-19 05:15:26,406 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-19 05:15:27,279 INFO L134 CoverageAnalysis]: Checked inductivity of 3403 backedges. 0 proven. 1430 refuted. 0 times theorem prover too weak. 1973 trivial. 0 not checked. [2023-11-19 05:15:27,280 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1522850997] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-19 05:15:27,280 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [923262005] [2023-11-19 05:15:27,282 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2023-11-19 05:15:27,283 INFO L166 IcfgInterpreter]: Building call graph [2023-11-19 05:15:27,283 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-19 05:15:27,283 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-19 05:15:27,284 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-19 05:15:27,656 INFO L197 IcfgInterpreter]: Interpreting procedure sep with input of size 10 for LOIs [2023-11-19 05:15:27,730 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-19 05:15:28,360 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '6107#(and (<= 1 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~ret2~0#1| 2147483647) (or (not (= |ULTIMATE.start_main_~ret2~0#1| |ULTIMATE.start_main_~ret~1#1|)) (not (= |ULTIMATE.start_main_~ret5~0#1| |ULTIMATE.start_main_~ret~1#1|))) (<= 0 (+ |ULTIMATE.start_main_~ret~1#1| 2147483648)) (<= 0 (+ |ULTIMATE.start_main_~ret5~0#1| 2147483648)) (<= |ULTIMATE.start_main_~ret~1#1| 2147483647) (<= 2 |ULTIMATE.start_main_~#x~0#1.base|) (= |ULTIMATE.start_main_~#x~0#1.offset| 0) (<= 0 (+ |ULTIMATE.start_main_~ret2~0#1| 2147483648)) (<= |ULTIMATE.start_main_~ret5~0#1| 2147483647))' at error location [2023-11-19 05:15:28,360 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-19 05:15:28,360 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-19 05:15:28,361 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [26, 26, 26] total 43 [2023-11-19 05:15:28,361 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1272235073] [2023-11-19 05:15:28,361 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-19 05:15:28,362 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 43 states [2023-11-19 05:15:28,362 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:15:28,363 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 43 interpolants. [2023-11-19 05:15:28,365 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=944, Invalid=1909, Unknown=9, NotChecked=0, Total=2862 [2023-11-19 05:15:28,365 INFO L87 Difference]: Start difference. First operand 84 states and 88 transitions. Second operand has 43 states, 43 states have (on average 1.4186046511627908) internal successors, (61), 43 states have internal predecessors, (61), 2 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (5), 1 states have call predecessors, (5), 2 states have call successors, (5) [2023-11-19 05:15:28,480 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:15:28,480 INFO L93 Difference]: Finished difference Result 142 states and 168 transitions. [2023-11-19 05:15:28,481 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 42 states. [2023-11-19 05:15:28,481 INFO L78 Accepts]: Start accepts. Automaton has has 43 states, 43 states have (on average 1.4186046511627908) internal successors, (61), 43 states have internal predecessors, (61), 2 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (5), 1 states have call predecessors, (5), 2 states have call successors, (5) Word has length 135 [2023-11-19 05:15:28,483 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:15:28,484 INFO L225 Difference]: With dead ends: 142 [2023-11-19 05:15:28,485 INFO L226 Difference]: Without dead ends: 101 [2023-11-19 05:15:28,490 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 429 GetRequests, 369 SyntacticMatches, 8 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 877 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=944, Invalid=1909, Unknown=9, NotChecked=0, Total=2862 [2023-11-19 05:15:28,491 INFO L413 NwaCegarLoop]: 12 mSDtfsCounter, 0 mSDsluCounter, 44 mSDsCounter, 0 mSdLazyCounter, 71 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 56 SdHoareTripleChecker+Invalid, 71 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 71 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-19 05:15:28,492 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 56 Invalid, 71 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 71 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-19 05:15:28,493 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 101 states. [2023-11-19 05:15:28,519 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 101 to 101. [2023-11-19 05:15:28,523 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 101 states, 96 states have (on average 1.03125) internal successors, (99), 96 states have internal predecessors, (99), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-11-19 05:15:28,524 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 101 states to 101 states and 105 transitions. [2023-11-19 05:15:28,524 INFO L78 Accepts]: Start accepts. Automaton has 101 states and 105 transitions. Word has length 135 [2023-11-19 05:15:28,526 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:15:28,527 INFO L495 AbstractCegarLoop]: Abstraction has 101 states and 105 transitions. [2023-11-19 05:15:28,527 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 43 states, 43 states have (on average 1.4186046511627908) internal successors, (61), 43 states have internal predecessors, (61), 2 states have call successors, (5), 2 states have call predecessors, (5), 2 states have return successors, (5), 1 states have call predecessors, (5), 2 states have call successors, (5) [2023-11-19 05:15:28,527 INFO L276 IsEmpty]: Start isEmpty. Operand 101 states and 105 transitions. [2023-11-19 05:15:28,533 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 187 [2023-11-19 05:15:28,535 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:15:28,535 INFO L195 NwaCegarLoop]: trace histogram [120, 40, 6, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 05:15:28,569 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60a199c2-3833-4939-8bf7-56154fc7d199/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (12)] Forceful destruction successful, exit code 0 [2023-11-19 05:15:28,761 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,12 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60a199c2-3833-4939-8bf7-56154fc7d199/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:15:28,762 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 05:15:28,762 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:15:28,762 INFO L85 PathProgramCache]: Analyzing trace with hash 1672292988, now seen corresponding path program 10 times [2023-11-19 05:15:28,762 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:15:28,762 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [847408510] [2023-11-19 05:15:28,762 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:15:28,763 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:15:29,030 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:15:29,933 INFO L134 CoverageAnalysis]: Checked inductivity of 8350 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 8329 trivial. 0 not checked. [2023-11-19 05:15:29,934 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:15:29,934 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [847408510] [2023-11-19 05:15:29,934 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [847408510] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 05:15:29,934 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [692611421] [2023-11-19 05:15:29,935 INFO L93 rtionOrderModulation]: Changing assertion order to NOT_INCREMENTALLY [2023-11-19 05:15:29,936 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:15:29,936 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60a199c2-3833-4939-8bf7-56154fc7d199/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 05:15:29,937 INFO L229 MonitoredProcess]: Starting monitored process 13 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60a199c2-3833-4939-8bf7-56154fc7d199/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 05:15:29,968 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60a199c2-3833-4939-8bf7-56154fc7d199/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Waiting until timeout for monitored process [2023-11-19 05:15:30,441 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:15:30,450 INFO L262 TraceCheckSpWp]: Trace formula consists of 1002 conjuncts, 8 conjunts are in the unsatisfiable core [2023-11-19 05:15:30,457 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 05:15:30,489 INFO L134 CoverageAnalysis]: Checked inductivity of 8350 backedges. 3366 proven. 21 refuted. 0 times theorem prover too weak. 4963 trivial. 0 not checked. [2023-11-19 05:15:30,489 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-19 05:15:30,632 INFO L134 CoverageAnalysis]: Checked inductivity of 8350 backedges. 0 proven. 21 refuted. 0 times theorem prover too weak. 8329 trivial. 0 not checked. [2023-11-19 05:15:30,633 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [692611421] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-19 05:15:30,633 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1612524472] [2023-11-19 05:15:30,637 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2023-11-19 05:15:30,637 INFO L166 IcfgInterpreter]: Building call graph [2023-11-19 05:15:30,638 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-19 05:15:30,638 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-19 05:15:30,638 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-19 05:15:30,967 INFO L197 IcfgInterpreter]: Interpreting procedure sep with input of size 10 for LOIs [2023-11-19 05:15:31,084 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-19 05:15:31,476 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '7708#(and (<= 1 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~ret2~0#1| 2147483647) (or (not (= |ULTIMATE.start_main_~ret2~0#1| |ULTIMATE.start_main_~ret~1#1|)) (not (= |ULTIMATE.start_main_~ret5~0#1| |ULTIMATE.start_main_~ret~1#1|))) (<= 0 (+ |ULTIMATE.start_main_~ret~1#1| 2147483648)) (<= 0 (+ |ULTIMATE.start_main_~ret5~0#1| 2147483648)) (<= |ULTIMATE.start_main_~ret~1#1| 2147483647) (<= 2 |ULTIMATE.start_main_~#x~0#1.base|) (= |ULTIMATE.start_main_~#x~0#1.offset| 0) (<= 0 (+ |ULTIMATE.start_main_~ret2~0#1| 2147483648)) (<= |ULTIMATE.start_main_~ret5~0#1| 2147483647))' at error location [2023-11-19 05:15:31,476 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-19 05:15:31,476 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-19 05:15:31,476 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 9, 9] total 17 [2023-11-19 05:15:31,476 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1698956067] [2023-11-19 05:15:31,477 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-19 05:15:31,477 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2023-11-19 05:15:31,478 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:15:31,478 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2023-11-19 05:15:31,479 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=177, Invalid=570, Unknown=9, NotChecked=0, Total=756 [2023-11-19 05:15:31,479 INFO L87 Difference]: Start difference. First operand 101 states and 105 transitions. Second operand has 17 states, 17 states have (on average 1.8235294117647058) internal successors, (31), 17 states have internal predecessors, (31), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2023-11-19 05:15:31,529 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:15:31,529 INFO L93 Difference]: Finished difference Result 157 states and 169 transitions. [2023-11-19 05:15:31,537 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2023-11-19 05:15:31,537 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 1.8235294117647058) internal successors, (31), 17 states have internal predecessors, (31), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) Word has length 186 [2023-11-19 05:15:31,538 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:15:31,539 INFO L225 Difference]: With dead ends: 157 [2023-11-19 05:15:31,539 INFO L226 Difference]: Without dead ends: 109 [2023-11-19 05:15:31,540 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 565 GetRequests, 539 SyntacticMatches, 0 SemanticMatches, 26 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 268 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=177, Invalid=570, Unknown=9, NotChecked=0, Total=756 [2023-11-19 05:15:31,541 INFO L413 NwaCegarLoop]: 12 mSDtfsCounter, 0 mSDsluCounter, 44 mSDsCounter, 0 mSdLazyCounter, 45 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 56 SdHoareTripleChecker+Invalid, 46 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 45 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-19 05:15:31,542 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 56 Invalid, 46 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 45 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-19 05:15:31,543 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 109 states. [2023-11-19 05:15:31,550 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 109 to 109. [2023-11-19 05:15:31,551 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 109 states, 104 states have (on average 1.0288461538461537) internal successors, (107), 104 states have internal predecessors, (107), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-11-19 05:15:31,552 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 109 states to 109 states and 113 transitions. [2023-11-19 05:15:31,552 INFO L78 Accepts]: Start accepts. Automaton has 109 states and 113 transitions. Word has length 186 [2023-11-19 05:15:31,553 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:15:31,553 INFO L495 AbstractCegarLoop]: Abstraction has 109 states and 113 transitions. [2023-11-19 05:15:31,553 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 17 states have (on average 1.8235294117647058) internal successors, (31), 17 states have internal predecessors, (31), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2023-11-19 05:15:31,553 INFO L276 IsEmpty]: Start isEmpty. Operand 109 states and 113 transitions. [2023-11-19 05:15:31,556 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 195 [2023-11-19 05:15:31,556 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:15:31,556 INFO L195 NwaCegarLoop]: trace histogram [120, 40, 14, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 05:15:31,576 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60a199c2-3833-4939-8bf7-56154fc7d199/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (13)] Forceful destruction successful, exit code 0 [2023-11-19 05:15:31,760 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 13 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60a199c2-3833-4939-8bf7-56154fc7d199/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable12 [2023-11-19 05:15:31,761 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 05:15:31,761 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:15:31,761 INFO L85 PathProgramCache]: Analyzing trace with hash 1460139644, now seen corresponding path program 11 times [2023-11-19 05:15:31,762 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:15:31,762 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [623926891] [2023-11-19 05:15:31,762 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:15:31,762 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:15:32,066 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:15:33,648 INFO L134 CoverageAnalysis]: Checked inductivity of 8434 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 8329 trivial. 0 not checked. [2023-11-19 05:15:33,652 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:15:33,653 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [623926891] [2023-11-19 05:15:33,653 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [623926891] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 05:15:33,653 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1071108459] [2023-11-19 05:15:33,653 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-19 05:15:33,654 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:15:33,654 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60a199c2-3833-4939-8bf7-56154fc7d199/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 05:15:33,655 INFO L229 MonitoredProcess]: Starting monitored process 14 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60a199c2-3833-4939-8bf7-56154fc7d199/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 05:15:33,687 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60a199c2-3833-4939-8bf7-56154fc7d199/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Waiting until timeout for monitored process [2023-11-19 05:15:35,867 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 9 check-sat command(s) [2023-11-19 05:15:35,867 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-19 05:15:35,874 INFO L262 TraceCheckSpWp]: Trace formula consists of 451 conjuncts, 21 conjunts are in the unsatisfiable core [2023-11-19 05:15:35,881 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 05:15:35,961 INFO L134 CoverageAnalysis]: Checked inductivity of 8434 backedges. 3406 proven. 105 refuted. 0 times theorem prover too weak. 4923 trivial. 0 not checked. [2023-11-19 05:15:35,961 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-19 05:15:36,427 INFO L134 CoverageAnalysis]: Checked inductivity of 8434 backedges. 0 proven. 105 refuted. 0 times theorem prover too weak. 8329 trivial. 0 not checked. [2023-11-19 05:15:36,428 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1071108459] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-19 05:15:36,428 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2092985590] [2023-11-19 05:15:36,433 INFO L159 IcfgInterpreter]: Started Sifa with 15 locations of interest [2023-11-19 05:15:36,435 INFO L166 IcfgInterpreter]: Building call graph [2023-11-19 05:15:36,436 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-19 05:15:36,436 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-19 05:15:36,436 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-19 05:15:36,819 INFO L197 IcfgInterpreter]: Interpreting procedure sep with input of size 10 for LOIs [2023-11-19 05:15:36,868 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-19 05:15:37,356 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '9422#(and (<= 1 |#StackHeapBarrier|) (<= |ULTIMATE.start_main_~ret2~0#1| 2147483647) (or (not (= |ULTIMATE.start_main_~ret2~0#1| |ULTIMATE.start_main_~ret~1#1|)) (not (= |ULTIMATE.start_main_~ret5~0#1| |ULTIMATE.start_main_~ret~1#1|))) (<= 0 (+ |ULTIMATE.start_main_~ret~1#1| 2147483648)) (<= 0 (+ |ULTIMATE.start_main_~ret5~0#1| 2147483648)) (<= |ULTIMATE.start_main_~ret~1#1| 2147483647) (<= 2 |ULTIMATE.start_main_~#x~0#1.base|) (= |ULTIMATE.start_main_~#x~0#1.offset| 0) (<= 0 (+ |ULTIMATE.start_main_~ret2~0#1| 2147483648)) (<= |ULTIMATE.start_main_~ret5~0#1| 2147483647))' at error location [2023-11-19 05:15:37,356 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-19 05:15:37,356 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-19 05:15:37,356 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [17, 18, 17] total 34 [2023-11-19 05:15:37,356 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [751285844] [2023-11-19 05:15:37,357 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-19 05:15:37,358 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 34 states [2023-11-19 05:15:37,358 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:15:37,359 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 34 interpolants. [2023-11-19 05:15:37,360 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=571, Invalid=1400, Unknown=9, NotChecked=0, Total=1980 [2023-11-19 05:15:37,360 INFO L87 Difference]: Start difference. First operand 109 states and 113 transitions. Second operand has 34 states, 34 states have (on average 1.4411764705882353) internal successors, (49), 34 states have internal predecessors, (49), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2023-11-19 05:15:37,461 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:15:37,462 INFO L93 Difference]: Finished difference Result 173 states and 193 transitions. [2023-11-19 05:15:37,462 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 33 states. [2023-11-19 05:15:37,463 INFO L78 Accepts]: Start accepts. Automaton has has 34 states, 34 states have (on average 1.4411764705882353) internal successors, (49), 34 states have internal predecessors, (49), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) Word has length 194 [2023-11-19 05:15:37,463 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:15:37,466 INFO L225 Difference]: With dead ends: 173 [2023-11-19 05:15:37,466 INFO L226 Difference]: Without dead ends: 125 [2023-11-19 05:15:37,469 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 597 GetRequests, 554 SyntacticMatches, 0 SemanticMatches, 43 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 578 ImplicationChecksByTransitivity, 1.0s TimeCoverageRelationStatistics Valid=571, Invalid=1400, Unknown=9, NotChecked=0, Total=1980 [2023-11-19 05:15:37,470 INFO L413 NwaCegarLoop]: 12 mSDtfsCounter, 0 mSDsluCounter, 67 mSDsCounter, 0 mSdLazyCounter, 73 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 79 SdHoareTripleChecker+Invalid, 75 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 73 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-19 05:15:37,470 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 79 Invalid, 75 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 73 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-19 05:15:37,472 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 125 states. [2023-11-19 05:15:37,482 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 125 to 125. [2023-11-19 05:15:37,483 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 125 states, 120 states have (on average 1.025) internal successors, (123), 120 states have internal predecessors, (123), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-11-19 05:15:37,484 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 125 states to 125 states and 129 transitions. [2023-11-19 05:15:37,484 INFO L78 Accepts]: Start accepts. Automaton has 125 states and 129 transitions. Word has length 194 [2023-11-19 05:15:37,485 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:15:37,485 INFO L495 AbstractCegarLoop]: Abstraction has 125 states and 129 transitions. [2023-11-19 05:15:37,485 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 34 states, 34 states have (on average 1.4411764705882353) internal successors, (49), 34 states have internal predecessors, (49), 2 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2023-11-19 05:15:37,486 INFO L276 IsEmpty]: Start isEmpty. Operand 125 states and 129 transitions. [2023-11-19 05:15:37,489 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 211 [2023-11-19 05:15:37,489 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:15:37,489 INFO L195 NwaCegarLoop]: trace histogram [120, 40, 30, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 05:15:37,517 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60a199c2-3833-4939-8bf7-56154fc7d199/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (14)] Ended with exit code 0 [2023-11-19 05:15:37,708 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 14 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_60a199c2-3833-4939-8bf7-56154fc7d199/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2023-11-19 05:15:37,709 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 05:15:37,709 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:15:37,709 INFO L85 PathProgramCache]: Analyzing trace with hash 890867324, now seen corresponding path program 12 times [2023-11-19 05:15:37,709 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:15:37,709 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1595553439] [2023-11-19 05:15:37,710 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:15:37,710 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:15:38,019 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat