./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/list-simple/sll2n_insert_unequal.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 30e01a73 Calling Ultimate with: /usr/lib/jvm/java-11-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_331067c8-cce1-431b-b67e-e0f49cebe9f0/bin/utaipan-verify-mE87zJ7Ire/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_331067c8-cce1-431b-b67e-e0f49cebe9f0/bin/utaipan-verify-mE87zJ7Ire/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_331067c8-cce1-431b-b67e-e0f49cebe9f0/bin/utaipan-verify-mE87zJ7Ire/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_331067c8-cce1-431b-b67e-e0f49cebe9f0/bin/utaipan-verify-mE87zJ7Ire/config/TaipanReach.xml -i ../../sv-benchmarks/c/list-simple/sll2n_insert_unequal.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_331067c8-cce1-431b-b67e-e0f49cebe9f0/bin/utaipan-verify-mE87zJ7Ire/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_331067c8-cce1-431b-b67e-e0f49cebe9f0/bin/utaipan-verify-mE87zJ7Ire --witnessprinter.witness.filename witness --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 383c6933c6ab916f651364224af1d774f30e162ad506fd2f28fe7f76c4487ba3 --- Real Ultimate output --- This is Ultimate 0.2.3-dev-30e01a7 [2023-11-23 21:31:53,231 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-11-23 21:31:53,331 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_331067c8-cce1-431b-b67e-e0f49cebe9f0/bin/utaipan-verify-mE87zJ7Ire/config/svcomp-Reach-32bit-Taipan_Default.epf [2023-11-23 21:31:53,337 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-11-23 21:31:53,338 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-11-23 21:31:53,360 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-11-23 21:31:53,361 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-11-23 21:31:53,361 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-11-23 21:31:53,362 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-11-23 21:31:53,363 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-11-23 21:31:53,363 INFO L153 SettingsManager]: * User list type=DISABLED [2023-11-23 21:31:53,364 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-11-23 21:31:53,365 INFO L153 SettingsManager]: * Explicit value domain=true [2023-11-23 21:31:53,365 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-11-23 21:31:53,366 INFO L153 SettingsManager]: * Octagon Domain=false [2023-11-23 21:31:53,367 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-11-23 21:31:53,367 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-11-23 21:31:53,368 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-11-23 21:31:53,369 INFO L153 SettingsManager]: * Interval Domain=false [2023-11-23 21:31:53,369 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-11-23 21:31:53,370 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-11-23 21:31:53,371 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2023-11-23 21:31:53,372 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-11-23 21:31:53,372 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-11-23 21:31:53,373 INFO L153 SettingsManager]: * sizeof long=4 [2023-11-23 21:31:53,373 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-11-23 21:31:53,374 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-11-23 21:31:53,375 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-11-23 21:31:53,375 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-11-23 21:31:53,376 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-11-23 21:31:53,376 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-11-23 21:31:53,376 INFO L153 SettingsManager]: * sizeof long double=12 [2023-11-23 21:31:53,377 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2023-11-23 21:31:53,377 INFO L153 SettingsManager]: * Use constant arrays=true [2023-11-23 21:31:53,378 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-11-23 21:31:53,378 INFO L153 SettingsManager]: * Only consider context switches at boundaries of atomic blocks=true [2023-11-23 21:31:53,378 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-11-23 21:31:53,379 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-23 21:31:53,379 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-11-23 21:31:53,380 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-11-23 21:31:53,380 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2023-11-23 21:31:53,380 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-11-23 21:31:53,381 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-11-23 21:31:53,381 INFO L153 SettingsManager]: * Apply one-shot large block encoding in concurrent analysis=false [2023-11-23 21:31:53,381 INFO L153 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-11-23 21:31:53,382 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-11-23 21:31:53,382 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-11-23 21:31:53,382 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_331067c8-cce1-431b-b67e-e0f49cebe9f0/bin/utaipan-verify-mE87zJ7Ire/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_331067c8-cce1-431b-b67e-e0f49cebe9f0/bin/utaipan-verify-mE87zJ7Ire Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 383c6933c6ab916f651364224af1d774f30e162ad506fd2f28fe7f76c4487ba3 [2023-11-23 21:31:53,686 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-11-23 21:31:53,710 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-11-23 21:31:53,712 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-11-23 21:31:53,715 INFO L270 PluginConnector]: Initializing CDTParser... [2023-11-23 21:31:53,715 INFO L274 PluginConnector]: CDTParser initialized [2023-11-23 21:31:53,716 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_331067c8-cce1-431b-b67e-e0f49cebe9f0/bin/utaipan-verify-mE87zJ7Ire/../../sv-benchmarks/c/list-simple/sll2n_insert_unequal.i [2023-11-23 21:31:56,830 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-11-23 21:31:57,180 INFO L384 CDTParser]: Found 1 translation units. [2023-11-23 21:31:57,180 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_331067c8-cce1-431b-b67e-e0f49cebe9f0/sv-benchmarks/c/list-simple/sll2n_insert_unequal.i [2023-11-23 21:31:57,202 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_331067c8-cce1-431b-b67e-e0f49cebe9f0/bin/utaipan-verify-mE87zJ7Ire/data/6aaf8bc9f/1f1928f1f41143fb82b793951a2e761a/FLAGf999d137e [2023-11-23 21:31:57,220 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_331067c8-cce1-431b-b67e-e0f49cebe9f0/bin/utaipan-verify-mE87zJ7Ire/data/6aaf8bc9f/1f1928f1f41143fb82b793951a2e761a [2023-11-23 21:31:57,225 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-11-23 21:31:57,227 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-11-23 21:31:57,236 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-11-23 21:31:57,236 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-11-23 21:31:57,244 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-11-23 21:31:57,245 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 09:31:57" (1/1) ... [2023-11-23 21:31:57,247 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@223f192 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:31:57, skipping insertion in model container [2023-11-23 21:31:57,247 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 09:31:57" (1/1) ... [2023-11-23 21:31:57,310 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-11-23 21:31:57,665 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_331067c8-cce1-431b-b67e-e0f49cebe9f0/sv-benchmarks/c/list-simple/sll2n_insert_unequal.i[24620,24633] [2023-11-23 21:31:57,677 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-23 21:31:57,691 INFO L202 MainTranslator]: Completed pre-run [2023-11-23 21:31:57,759 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_331067c8-cce1-431b-b67e-e0f49cebe9f0/sv-benchmarks/c/list-simple/sll2n_insert_unequal.i[24620,24633] [2023-11-23 21:31:57,762 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-23 21:31:57,796 INFO L206 MainTranslator]: Completed translation [2023-11-23 21:31:57,796 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:31:57 WrapperNode [2023-11-23 21:31:57,796 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-11-23 21:31:57,797 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-11-23 21:31:57,798 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-11-23 21:31:57,798 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-11-23 21:31:57,806 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:31:57" (1/1) ... [2023-11-23 21:31:57,822 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:31:57" (1/1) ... [2023-11-23 21:31:57,848 INFO L138 Inliner]: procedures = 128, calls = 36, calls flagged for inlining = 6, calls inlined = 6, statements flattened = 151 [2023-11-23 21:31:57,848 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-11-23 21:31:57,849 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-11-23 21:31:57,849 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-11-23 21:31:57,849 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-11-23 21:31:57,869 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:31:57" (1/1) ... [2023-11-23 21:31:57,870 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:31:57" (1/1) ... [2023-11-23 21:31:57,876 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:31:57" (1/1) ... [2023-11-23 21:31:57,889 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:31:57" (1/1) ... [2023-11-23 21:31:57,913 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:31:57" (1/1) ... [2023-11-23 21:31:57,917 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:31:57" (1/1) ... [2023-11-23 21:31:57,919 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:31:57" (1/1) ... [2023-11-23 21:31:57,925 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:31:57" (1/1) ... [2023-11-23 21:31:57,929 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-11-23 21:31:57,934 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-11-23 21:31:57,934 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-11-23 21:31:57,934 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-11-23 21:31:57,935 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:31:57" (1/1) ... [2023-11-23 21:31:57,944 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-23 21:31:57,961 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_331067c8-cce1-431b-b67e-e0f49cebe9f0/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:31:57,978 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_331067c8-cce1-431b-b67e-e0f49cebe9f0/bin/utaipan-verify-mE87zJ7Ire/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-11-23 21:31:58,009 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_331067c8-cce1-431b-b67e-e0f49cebe9f0/bin/utaipan-verify-mE87zJ7Ire/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-11-23 21:31:58,052 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-11-23 21:31:58,065 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-11-23 21:31:58,065 INFO L130 BoogieDeclarations]: Found specification of procedure node_create [2023-11-23 21:31:58,066 INFO L138 BoogieDeclarations]: Found implementation of procedure node_create [2023-11-23 21:31:58,066 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2023-11-23 21:31:58,066 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-11-23 21:31:58,066 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2023-11-23 21:31:58,066 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2023-11-23 21:31:58,067 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2023-11-23 21:31:58,067 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-11-23 21:31:58,067 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~$Pointer$ [2023-11-23 21:31:58,067 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-11-23 21:31:58,067 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-11-23 21:31:58,068 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-11-23 21:31:58,286 INFO L241 CfgBuilder]: Building ICFG [2023-11-23 21:31:58,289 INFO L267 CfgBuilder]: Building CFG for each procedure with an implementation [2023-11-23 21:31:58,592 INFO L282 CfgBuilder]: Performing block encoding [2023-11-23 21:31:58,694 INFO L304 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-11-23 21:31:58,695 INFO L309 CfgBuilder]: Removed 5 assume(true) statements. [2023-11-23 21:31:58,697 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 09:31:58 BoogieIcfgContainer [2023-11-23 21:31:58,697 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-11-23 21:31:58,700 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-11-23 21:31:58,701 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-11-23 21:31:58,705 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-11-23 21:31:58,705 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.11 09:31:57" (1/3) ... [2023-11-23 21:31:58,706 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3016844 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 09:31:58, skipping insertion in model container [2023-11-23 21:31:58,707 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:31:57" (2/3) ... [2023-11-23 21:31:58,708 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3016844 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 09:31:58, skipping insertion in model container [2023-11-23 21:31:58,708 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 09:31:58" (3/3) ... [2023-11-23 21:31:58,710 INFO L112 eAbstractionObserver]: Analyzing ICFG sll2n_insert_unequal.i [2023-11-23 21:31:58,729 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-11-23 21:31:58,729 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-11-23 21:31:58,786 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-11-23 21:31:58,795 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;@3a6a72bb, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-11-23 21:31:58,796 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-11-23 21:31:58,800 INFO L276 IsEmpty]: Start isEmpty. Operand has 22 states, 17 states have (on average 1.6470588235294117) internal successors, (28), 18 states have internal predecessors, (28), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-11-23 21:31:58,808 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2023-11-23 21:31:58,809 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:31:58,810 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:31:58,811 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:31:58,818 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:31:58,818 INFO L85 PathProgramCache]: Analyzing trace with hash -1377697261, now seen corresponding path program 1 times [2023-11-23 21:31:58,829 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:31:58,830 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2062444646] [2023-11-23 21:31:58,830 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:31:58,830 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:31:58,977 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:31:59,254 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 21:31:59,255 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:31:59,255 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2062444646] [2023-11-23 21:31:59,256 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2062444646] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 21:31:59,256 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-23 21:31:59,256 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-11-23 21:31:59,258 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2059842153] [2023-11-23 21:31:59,259 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:31:59,263 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-23 21:31:59,264 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:31:59,306 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-23 21:31:59,307 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-23 21:31:59,310 INFO L87 Difference]: Start difference. First operand has 22 states, 17 states have (on average 1.6470588235294117) internal successors, (28), 18 states have internal predecessors, (28), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Second operand has 3 states, 3 states have (on average 3.0) internal successors, (9), 3 states have internal predecessors, (9), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-11-23 21:31:59,385 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:31:59,385 INFO L93 Difference]: Finished difference Result 43 states and 63 transitions. [2023-11-23 21:31:59,387 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-23 21:31:59,388 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 3.0) internal successors, (9), 3 states have internal predecessors, (9), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 11 [2023-11-23 21:31:59,388 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:31:59,396 INFO L225 Difference]: With dead ends: 43 [2023-11-23 21:31:59,397 INFO L226 Difference]: Without dead ends: 21 [2023-11-23 21:31:59,400 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-23 21:31:59,407 INFO L413 NwaCegarLoop]: 21 mSDtfsCounter, 1 mSDsluCounter, 21 mSDsCounter, 0 mSdLazyCounter, 19 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 42 SdHoareTripleChecker+Invalid, 19 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 19 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-23 21:31:59,408 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [2 Valid, 42 Invalid, 19 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 19 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-23 21:31:59,428 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2023-11-23 21:31:59,458 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 19. [2023-11-23 21:31:59,466 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19 states, 15 states have (on average 1.4666666666666666) internal successors, (22), 15 states have internal predecessors, (22), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-11-23 21:31:59,468 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 26 transitions. [2023-11-23 21:31:59,470 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 26 transitions. Word has length 11 [2023-11-23 21:31:59,470 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:31:59,471 INFO L495 AbstractCegarLoop]: Abstraction has 19 states and 26 transitions. [2023-11-23 21:31:59,472 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 3.0) internal successors, (9), 3 states have internal predecessors, (9), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-11-23 21:31:59,472 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 26 transitions. [2023-11-23 21:31:59,474 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2023-11-23 21:31:59,475 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:31:59,475 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:31:59,476 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-11-23 21:31:59,477 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:31:59,478 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:31:59,479 INFO L85 PathProgramCache]: Analyzing trace with hash -4769702, now seen corresponding path program 1 times [2023-11-23 21:31:59,479 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:31:59,479 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1493852759] [2023-11-23 21:31:59,479 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:31:59,481 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:31:59,537 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:31:59,667 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-11-23 21:31:59,667 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:31:59,668 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1493852759] [2023-11-23 21:31:59,668 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1493852759] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:31:59,668 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [842914483] [2023-11-23 21:31:59,669 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:31:59,669 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:31:59,669 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_331067c8-cce1-431b-b67e-e0f49cebe9f0/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:31:59,671 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_331067c8-cce1-431b-b67e-e0f49cebe9f0/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:31:59,685 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_331067c8-cce1-431b-b67e-e0f49cebe9f0/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-11-23 21:31:59,923 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:31:59,925 INFO L262 TraceCheckSpWp]: Trace formula consists of 267 conjuncts, 5 conjunts are in the unsatisfiable core [2023-11-23 21:31:59,947 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 21:32:00,020 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 3 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 21:32:00,021 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-23 21:32:00,061 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-11-23 21:32:00,062 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [842914483] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-23 21:32:00,062 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [474624425] [2023-11-23 21:32:00,093 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-11-23 21:32:00,093 INFO L166 IcfgInterpreter]: Building call graph [2023-11-23 21:32:00,098 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-23 21:32:00,104 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-23 21:32:00,104 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-23 21:32:02,697 INFO L197 IcfgInterpreter]: Interpreting procedure node_create with input of size 65 for LOIs [2023-11-23 21:32:02,857 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-23 21:32:04,620 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSifa [474624425] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 21:32:04,621 INFO L185 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2023-11-23 21:32:04,621 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10] imperfect sequences [4, 4, 4] total 14 [2023-11-23 21:32:04,622 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [264306962] [2023-11-23 21:32:04,623 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:32:04,623 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2023-11-23 21:32:04,623 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:32:04,624 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2023-11-23 21:32:04,625 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=31, Invalid=151, Unknown=0, NotChecked=0, Total=182 [2023-11-23 21:32:04,625 INFO L87 Difference]: Start difference. First operand 19 states and 26 transitions. Second operand has 11 states, 8 states have (on average 1.375) internal successors, (11), 7 states have internal predecessors, (11), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-11-23 21:32:05,340 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:32:05,340 INFO L93 Difference]: Finished difference Result 28 states and 40 transitions. [2023-11-23 21:32:05,341 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2023-11-23 21:32:05,341 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 8 states have (on average 1.375) internal successors, (11), 7 states have internal predecessors, (11), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 17 [2023-11-23 21:32:05,341 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:32:05,342 INFO L225 Difference]: With dead ends: 28 [2023-11-23 21:32:05,342 INFO L226 Difference]: Without dead ends: 20 [2023-11-23 21:32:05,343 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 39 SyntacticMatches, 2 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 36 ImplicationChecksByTransitivity, 1.9s TimeCoverageRelationStatistics Valid=37, Invalid=173, Unknown=0, NotChecked=0, Total=210 [2023-11-23 21:32:05,344 INFO L413 NwaCegarLoop]: 12 mSDtfsCounter, 0 mSDsluCounter, 34 mSDsCounter, 0 mSdLazyCounter, 168 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 46 SdHoareTripleChecker+Invalid, 170 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 168 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2023-11-23 21:32:05,345 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1 Valid, 46 Invalid, 170 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 168 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2023-11-23 21:32:05,346 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2023-11-23 21:32:05,353 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2023-11-23 21:32:05,353 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20 states, 16 states have (on average 1.4375) internal successors, (23), 16 states have internal predecessors, (23), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-11-23 21:32:05,354 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 27 transitions. [2023-11-23 21:32:05,354 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 27 transitions. Word has length 17 [2023-11-23 21:32:05,354 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:32:05,355 INFO L495 AbstractCegarLoop]: Abstraction has 20 states and 27 transitions. [2023-11-23 21:32:05,355 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 8 states have (on average 1.375) internal successors, (11), 7 states have internal predecessors, (11), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-11-23 21:32:05,355 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 27 transitions. [2023-11-23 21:32:05,356 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2023-11-23 21:32:05,356 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:32:05,356 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:32:05,383 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_331067c8-cce1-431b-b67e-e0f49cebe9f0/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-11-23 21:32:05,573 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_331067c8-cce1-431b-b67e-e0f49cebe9f0/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:32:05,574 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:32:05,574 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:32:05,574 INFO L85 PathProgramCache]: Analyzing trace with hash -245907211, now seen corresponding path program 1 times [2023-11-23 21:32:05,575 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:32:05,575 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1944589344] [2023-11-23 21:32:05,575 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:32:05,575 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:32:05,607 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:32:05,712 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-11-23 21:32:05,713 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:32:05,713 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1944589344] [2023-11-23 21:32:05,713 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1944589344] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:32:05,714 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1491538953] [2023-11-23 21:32:05,714 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:32:05,714 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:32:05,714 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_331067c8-cce1-431b-b67e-e0f49cebe9f0/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:32:05,715 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_331067c8-cce1-431b-b67e-e0f49cebe9f0/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:32:05,722 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_331067c8-cce1-431b-b67e-e0f49cebe9f0/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-11-23 21:32:05,877 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:32:05,880 INFO L262 TraceCheckSpWp]: Trace formula consists of 278 conjuncts, 5 conjunts are in the unsatisfiable core [2023-11-23 21:32:05,883 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 21:32:05,897 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 3 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-23 21:32:05,897 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-23 21:32:05,917 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2023-11-23 21:32:05,918 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1491538953] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-23 21:32:05,918 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1787154151] [2023-11-23 21:32:05,920 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-11-23 21:32:05,921 INFO L166 IcfgInterpreter]: Building call graph [2023-11-23 21:32:05,921 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-23 21:32:05,922 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-23 21:32:05,922 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-23 21:32:07,743 INFO L197 IcfgInterpreter]: Interpreting procedure node_create with input of size 65 for LOIs [2023-11-23 21:32:07,883 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-23 21:32:11,896 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '401#(and (<= 1 |#StackHeapBarrier|) (= |ULTIMATE.start_main_~mid_index~0#1| 1) (not (= (select (select |#memory_int| |ULTIMATE.start_main_~ptr~0#1.base|) |ULTIMATE.start_main_~ptr~0#1.offset|) 1)) (= |ULTIMATE.start_main_~uneq~0#1| 5) (or (not (= |ULTIMATE.start_main_~ptr~0#1.base| 0)) (not (= |ULTIMATE.start_main_~ptr~0#1.offset| 0))) (= |ULTIMATE.start_main_~temp~2#1.base| (select (select |#memory_$Pointer$.base| |ULTIMATE.start_main_~ptr~0#1.base|) (+ |ULTIMATE.start_main_~ptr~0#1.offset| 4))) (exists ((|v_ULTIMATE.start_sll_insert_~new_node~0#1.base_26| Int) (|v_#memory_$Pointer$.offset_50| (Array Int (Array Int Int))) (|v_ULTIMATE.start_sll_insert_~head#1.base_21| Int) (|v_ULTIMATE.start_sll_insert_~snd_to_last~0#1.offset_26| Int) (|v_#memory_int_99| (Array Int (Array Int Int))) (|v_ULTIMATE.start_sll_insert_~snd_to_last~0#1.base_26| Int) (|v_#memory_$Pointer$.base_50| (Array Int (Array Int Int))) (|v_#memory_$Pointer$.base_90| (Array Int (Array Int Int))) (|v_#memory_$Pointer$.offset_90| (Array Int (Array Int Int))) (|v_#memory_int_50| (Array Int (Array Int Int)))) (and (<= 2 |v_ULTIMATE.start_sll_insert_~head#1.base_21|) (= |#memory_int| (store |v_#memory_int_50| |v_ULTIMATE.start_sll_insert_~new_node~0#1.base_26| (store (select |v_#memory_int_50| |v_ULTIMATE.start_sll_insert_~new_node~0#1.base_26|) 4 (select (select |#memory_int| |v_ULTIMATE.start_sll_insert_~new_node~0#1.base_26|) 4)))) (= (store |v_#memory_$Pointer$.base_50| |v_ULTIMATE.start_sll_insert_~new_node~0#1.base_26| (store (select |v_#memory_$Pointer$.base_50| |v_ULTIMATE.start_sll_insert_~new_node~0#1.base_26|) 4 (select (select |#memory_$Pointer$.base| |v_ULTIMATE.start_sll_insert_~new_node~0#1.base_26|) 4))) |#memory_$Pointer$.base|) (or (and (or (not (= |v_ULTIMATE.start_sll_insert_~snd_to_last~0#1.offset_26| 0)) (not (= |v_ULTIMATE.start_sll_insert_~snd_to_last~0#1.base_26| 0))) (= (store |v_#memory_$Pointer$.offset_90| |v_ULTIMATE.start_sll_insert_~snd_to_last~0#1.base_26| (store (select |v_#memory_$Pointer$.offset_90| |v_ULTIMATE.start_sll_insert_~snd_to_last~0#1.base_26|) (+ |v_ULTIMATE.start_sll_insert_~snd_to_last~0#1.offset_26| 4) 0)) |v_#memory_$Pointer$.offset_50|) (= (store |v_#memory_$Pointer$.base_90| |v_ULTIMATE.start_sll_insert_~snd_to_last~0#1.base_26| (store (select |v_#memory_$Pointer$.base_90| |v_ULTIMATE.start_sll_insert_~snd_to_last~0#1.base_26|) (+ |v_ULTIMATE.start_sll_insert_~snd_to_last~0#1.offset_26| 4) |v_ULTIMATE.start_sll_insert_~new_node~0#1.base_26|)) |v_#memory_$Pointer$.base_50|) (= |v_#memory_int_50| (store |v_#memory_int_99| |v_ULTIMATE.start_sll_insert_~snd_to_last~0#1.base_26| (store (select |v_#memory_int_99| |v_ULTIMATE.start_sll_insert_~snd_to_last~0#1.base_26|) (+ |v_ULTIMATE.start_sll_insert_~snd_to_last~0#1.offset_26| 4) (select (select |v_#memory_int_50| |v_ULTIMATE.start_sll_insert_~snd_to_last~0#1.base_26|) (+ |v_ULTIMATE.start_sll_insert_~snd_to_last~0#1.offset_26| 4)))))) (and (= |v_ULTIMATE.start_sll_insert_~snd_to_last~0#1.offset_26| 0) (= |v_#memory_int_50| (store |v_#memory_int_99| |v_ULTIMATE.start_sll_insert_~head#1.base_21| (store (select |v_#memory_int_99| |v_ULTIMATE.start_sll_insert_~head#1.base_21|) 0 (select (select |v_#memory_int_50| |v_ULTIMATE.start_sll_insert_~head#1.base_21|) 0)))) (= (store |v_#memory_$Pointer$.offset_90| |v_ULTIMATE.start_sll_insert_~head#1.base_21| (store (select |v_#memory_$Pointer$.offset_90| |v_ULTIMATE.start_sll_insert_~head#1.base_21|) 0 0)) |v_#memory_$Pointer$.offset_50|) (= |v_ULTIMATE.start_sll_insert_~snd_to_last~0#1.base_26| 0) (= (store |v_#memory_$Pointer$.base_90| |v_ULTIMATE.start_sll_insert_~head#1.base_21| (store (select |v_#memory_$Pointer$.base_90| |v_ULTIMATE.start_sll_insert_~head#1.base_21|) 0 |v_ULTIMATE.start_sll_insert_~new_node~0#1.base_26|)) |v_#memory_$Pointer$.base_50|))) (= |#memory_$Pointer$.offset| (store |v_#memory_$Pointer$.offset_50| |v_ULTIMATE.start_sll_insert_~new_node~0#1.base_26| (store (select |v_#memory_$Pointer$.offset_50| |v_ULTIMATE.start_sll_insert_~new_node~0#1.base_26|) 4 (select (select |#memory_$Pointer$.offset| |v_ULTIMATE.start_sll_insert_~new_node~0#1.base_26|) 4)))))) (= |ULTIMATE.start_main_~count~0#1| 0) (= (select (select |#memory_$Pointer$.offset| |ULTIMATE.start_main_~#s~0#1.base|) 0) |ULTIMATE.start_main_~ptr~0#1.offset|) (= |ULTIMATE.start_sll_create_#res#1.offset| 0) (= |ULTIMATE.start_main_~data~0#1| 1) (= |ULTIMATE.start_main_~#s~0#1.offset| 0) (= |ULTIMATE.start_main_~len~0#1| 2) (= (select (select |#memory_$Pointer$.offset| |ULTIMATE.start_main_~ptr~0#1.base|) (+ |ULTIMATE.start_main_~ptr~0#1.offset| 4)) |ULTIMATE.start_main_~temp~2#1.offset|) (= (select (select |#memory_$Pointer$.base| |ULTIMATE.start_main_~#s~0#1.base|) 0) |ULTIMATE.start_main_~ptr~0#1.base|) (<= 2 |ULTIMATE.start_main_~#s~0#1.base|))' at error location [2023-11-23 21:32:11,897 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-23 21:32:11,897 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-23 21:32:11,897 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 5 [2023-11-23 21:32:11,898 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [171730369] [2023-11-23 21:32:11,898 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-23 21:32:11,898 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-11-23 21:32:11,899 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:32:11,899 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-11-23 21:32:11,900 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=233, Unknown=0, NotChecked=0, Total=272 [2023-11-23 21:32:11,900 INFO L87 Difference]: Start difference. First operand 20 states and 27 transitions. Second operand has 5 states, 5 states have (on average 3.4) internal successors, (17), 5 states have internal predecessors, (17), 3 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) [2023-11-23 21:32:11,951 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:32:11,951 INFO L93 Difference]: Finished difference Result 38 states and 52 transitions. [2023-11-23 21:32:11,957 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-11-23 21:32:11,957 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 3.4) internal successors, (17), 5 states have internal predecessors, (17), 3 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) Word has length 18 [2023-11-23 21:32:11,958 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:32:11,958 INFO L225 Difference]: With dead ends: 38 [2023-11-23 21:32:11,958 INFO L226 Difference]: Without dead ends: 23 [2023-11-23 21:32:11,959 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 39 SyntacticMatches, 2 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 50 ImplicationChecksByTransitivity, 4.0s TimeCoverageRelationStatistics Valid=39, Invalid=233, Unknown=0, NotChecked=0, Total=272 [2023-11-23 21:32:11,962 INFO L413 NwaCegarLoop]: 17 mSDtfsCounter, 1 mSDsluCounter, 16 mSDsCounter, 0 mSdLazyCounter, 17 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 33 SdHoareTripleChecker+Invalid, 18 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 17 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-23 21:32:11,962 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [2 Valid, 33 Invalid, 18 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 17 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-23 21:32:11,963 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2023-11-23 21:32:11,969 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 23. [2023-11-23 21:32:11,969 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23 states, 18 states have (on average 1.3888888888888888) internal successors, (25), 18 states have internal predecessors, (25), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-11-23 21:32:11,970 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 31 transitions. [2023-11-23 21:32:11,970 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 31 transitions. Word has length 18 [2023-11-23 21:32:11,971 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:32:11,971 INFO L495 AbstractCegarLoop]: Abstraction has 23 states and 31 transitions. [2023-11-23 21:32:11,971 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 3.4) internal successors, (17), 5 states have internal predecessors, (17), 3 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) [2023-11-23 21:32:11,971 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 31 transitions. [2023-11-23 21:32:11,972 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2023-11-23 21:32:11,972 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:32:11,973 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:32:11,994 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_331067c8-cce1-431b-b67e-e0f49cebe9f0/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Ended with exit code 0 [2023-11-23 21:32:12,185 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_331067c8-cce1-431b-b67e-e0f49cebe9f0/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:32:12,186 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:32:12,186 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:32:12,186 INFO L85 PathProgramCache]: Analyzing trace with hash 617430222, now seen corresponding path program 2 times [2023-11-23 21:32:12,187 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:32:12,187 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [639768185] [2023-11-23 21:32:12,187 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:32:12,187 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:32:12,295 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:32:14,460 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 6 proven. 6 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-11-23 21:32:14,461 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:32:14,461 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [639768185] [2023-11-23 21:32:14,461 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [639768185] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:32:14,462 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [179774758] [2023-11-23 21:32:14,462 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-23 21:32:14,462 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:32:14,462 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_331067c8-cce1-431b-b67e-e0f49cebe9f0/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:32:14,463 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_331067c8-cce1-431b-b67e-e0f49cebe9f0/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:32:14,469 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_331067c8-cce1-431b-b67e-e0f49cebe9f0/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-11-23 21:32:14,665 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2023-11-23 21:32:14,666 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-23 21:32:14,669 INFO L262 TraceCheckSpWp]: Trace formula consists of 278 conjuncts, 104 conjunts are in the unsatisfiable core [2023-11-23 21:32:14,675 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 21:32:14,772 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2023-11-23 21:32:14,793 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2023-11-23 21:32:14,904 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 11 [2023-11-23 21:32:15,076 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 38 treesize of output 22 [2023-11-23 21:32:15,083 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 3 [2023-11-23 21:32:15,090 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 5 treesize of output 3 [2023-11-23 21:32:15,095 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 3 [2023-11-23 21:32:15,294 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-23 21:32:15,296 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 46 treesize of output 35 [2023-11-23 21:32:15,319 INFO L349 Elim1Store]: treesize reduction 4, result has 66.7 percent of original size [2023-11-23 21:32:15,319 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 15 treesize of output 15 [2023-11-23 21:32:15,329 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 20 treesize of output 15 [2023-11-23 21:32:15,351 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-23 21:32:15,352 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 11 [2023-11-23 21:32:15,738 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-23 21:32:15,758 INFO L349 Elim1Store]: treesize reduction 44, result has 10.2 percent of original size [2023-11-23 21:32:15,758 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 103 treesize of output 76 [2023-11-23 21:32:15,781 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 89 treesize of output 53 [2023-11-23 21:32:15,792 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 24 treesize of output 26 [2023-11-23 21:32:15,806 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-23 21:32:15,808 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-23 21:32:15,810 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-23 21:32:15,814 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 7 [2023-11-23 21:32:15,820 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 11 [2023-11-23 21:32:15,917 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 6 proven. 6 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-11-23 21:32:15,917 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-23 21:32:18,240 WARN L854 $PredicateComparison]: unable to prove that (let ((.cse0 (= |c_ULTIMATE.start_sll_insert_~last~0#1.base| 0)) (.cse1 (= |c_ULTIMATE.start_sll_insert_~last~0#1.offset| 0))) (and (or (not .cse0) (not .cse1) (forall ((v_DerPreprocessor_7 (Array Int Int)) (v_DerPreprocessor_6 (Array Int Int)) (v_ArrVal_377 (Array Int Int)) (v_ArrVal_379 (Array Int Int)) (v_ArrVal_378 (Array Int Int))) (= |c_ULTIMATE.start_main_~data~0#1| (select (select (store (store |c_#memory_int| |c_ULTIMATE.start_sll_insert_~head#1.base| v_DerPreprocessor_7) |c_ULTIMATE.start_sll_insert_~new_node~0#1.base| v_ArrVal_378) (select (select (store (store |c_#memory_$Pointer$.base| |c_ULTIMATE.start_sll_insert_~head#1.base| v_DerPreprocessor_6) |c_ULTIMATE.start_sll_insert_~new_node~0#1.base| v_ArrVal_377) |c_ULTIMATE.start_main_~#s~0#1.base|) |c_ULTIMATE.start_main_~#s~0#1.offset|)) (select (select (store (store |c_#memory_$Pointer$.offset| |c_ULTIMATE.start_sll_insert_~head#1.base| (store (select |c_#memory_$Pointer$.offset| |c_ULTIMATE.start_sll_insert_~head#1.base|) |c_ULTIMATE.start_sll_insert_~head#1.offset| |c_ULTIMATE.start_sll_insert_~new_node~0#1.offset|)) |c_ULTIMATE.start_sll_insert_~new_node~0#1.base| v_ArrVal_379) |c_ULTIMATE.start_main_~#s~0#1.base|) |c_ULTIMATE.start_main_~#s~0#1.offset|))))) (or (forall ((v_DerPreprocessor_3 (Array Int Int)) (v_DerPreprocessor_5 (Array Int Int)) (v_DerPreprocessor_4 Int) (v_ArrVal_377 (Array Int Int)) (v_ArrVal_379 (Array Int Int)) (v_ArrVal_378 (Array Int Int))) (= |c_ULTIMATE.start_main_~data~0#1| (select (select (store (store |c_#memory_int| |c_ULTIMATE.start_sll_insert_~last~0#1.base| (store (select |c_#memory_int| |c_ULTIMATE.start_sll_insert_~last~0#1.base|) (+ |c_ULTIMATE.start_sll_insert_~last~0#1.offset| 4) v_DerPreprocessor_4)) |c_ULTIMATE.start_sll_insert_~new_node~0#1.base| v_ArrVal_378) (select (select (store (store |c_#memory_$Pointer$.base| |c_ULTIMATE.start_sll_insert_~last~0#1.base| v_DerPreprocessor_3) |c_ULTIMATE.start_sll_insert_~new_node~0#1.base| v_ArrVal_377) |c_ULTIMATE.start_main_~#s~0#1.base|) |c_ULTIMATE.start_main_~#s~0#1.offset|)) (select (select (store (store |c_#memory_$Pointer$.offset| |c_ULTIMATE.start_sll_insert_~last~0#1.base| v_DerPreprocessor_5) |c_ULTIMATE.start_sll_insert_~new_node~0#1.base| v_ArrVal_379) |c_ULTIMATE.start_main_~#s~0#1.base|) |c_ULTIMATE.start_main_~#s~0#1.offset|)))) (and .cse0 .cse1)))) is different from false [2023-11-23 21:32:19,117 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [179774758] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:32:19,118 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [893408940] [2023-11-23 21:32:19,120 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-11-23 21:32:19,121 INFO L166 IcfgInterpreter]: Building call graph [2023-11-23 21:32:19,121 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-23 21:32:19,121 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-23 21:32:19,122 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-23 21:32:20,871 INFO L197 IcfgInterpreter]: Interpreting procedure node_create with input of size 97 for LOIs [2023-11-23 21:32:21,102 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-23 21:32:26,626 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '623#(and (= |ULTIMATE.start_main_~ptr~0#1.base| (select (select |#memory_$Pointer$.base| |ULTIMATE.start_main_~#s~0#1.base|) |ULTIMATE.start_main_~#s~0#1.offset|)) (= (select (select |#memory_$Pointer$.offset| |ULTIMATE.start_main_~#s~0#1.base|) |ULTIMATE.start_main_~#s~0#1.offset|) |ULTIMATE.start_main_~ptr~0#1.offset|) (= |ULTIMATE.start_main_~uneq~0#1| 5) (or (not (= |ULTIMATE.start_main_~ptr~0#1.base| 0)) (not (= |ULTIMATE.start_main_~ptr~0#1.offset| 0))) (= |ULTIMATE.start_main_~temp~2#1.base| (select (select |#memory_$Pointer$.base| |ULTIMATE.start_main_~ptr~0#1.base|) (+ |ULTIMATE.start_main_~ptr~0#1.offset| 4))) (= |ULTIMATE.start_main_~count~0#1| 0) (not (= |ULTIMATE.start_main_~data~0#1| (select (select |#memory_int| |ULTIMATE.start_main_~ptr~0#1.base|) |ULTIMATE.start_main_~ptr~0#1.offset|))) (not (= |ULTIMATE.start_main_~mid_index~0#1| 0)) (exists ((|v_#memory_$Pointer$.offset_50| (Array Int (Array Int Int))) (|v_ULTIMATE.start_sll_insert_~head#1.base_23| Int) (|v_#memory_$Pointer$.offset_108| (Array Int (Array Int Int))) (|v_#memory_$Pointer$.base_108| (Array Int (Array Int Int))) (|v_#memory_int_127| (Array Int (Array Int Int))) (|v_ULTIMATE.start_sll_insert_~new_node~0#1.base_29| Int) (|v_#memory_$Pointer$.base_50| (Array Int (Array Int Int))) (|v_ULTIMATE.start_sll_insert_~snd_to_last~0#1.offset_32| Int) (|v_ULTIMATE.start_sll_insert_~head#1.offset_23| Int) (|v_ULTIMATE.start_sll_insert_~snd_to_last~0#1.base_32| Int) (|v_#memory_int_50| (Array Int (Array Int Int)))) (and (or (and (= |v_#memory_$Pointer$.base_50| (store |v_#memory_$Pointer$.base_108| |v_ULTIMATE.start_sll_insert_~head#1.base_23| (store (select |v_#memory_$Pointer$.base_108| |v_ULTIMATE.start_sll_insert_~head#1.base_23|) |v_ULTIMATE.start_sll_insert_~head#1.offset_23| |v_ULTIMATE.start_sll_insert_~new_node~0#1.base_29|))) (= |v_ULTIMATE.start_sll_insert_~snd_to_last~0#1.base_32| 0) (= |v_#memory_int_50| (store |v_#memory_int_127| |v_ULTIMATE.start_sll_insert_~head#1.base_23| (store (select |v_#memory_int_127| |v_ULTIMATE.start_sll_insert_~head#1.base_23|) |v_ULTIMATE.start_sll_insert_~head#1.offset_23| (select (select |v_#memory_int_50| |v_ULTIMATE.start_sll_insert_~head#1.base_23|) |v_ULTIMATE.start_sll_insert_~head#1.offset_23|)))) (= (store |v_#memory_$Pointer$.offset_108| |v_ULTIMATE.start_sll_insert_~head#1.base_23| (store (select |v_#memory_$Pointer$.offset_108| |v_ULTIMATE.start_sll_insert_~head#1.base_23|) |v_ULTIMATE.start_sll_insert_~head#1.offset_23| 0)) |v_#memory_$Pointer$.offset_50|) (= |v_ULTIMATE.start_sll_insert_~snd_to_last~0#1.offset_32| 0)) (and (= (store |v_#memory_$Pointer$.offset_108| |v_ULTIMATE.start_sll_insert_~snd_to_last~0#1.base_32| (store (select |v_#memory_$Pointer$.offset_108| |v_ULTIMATE.start_sll_insert_~snd_to_last~0#1.base_32|) (+ |v_ULTIMATE.start_sll_insert_~snd_to_last~0#1.offset_32| 4) 0)) |v_#memory_$Pointer$.offset_50|) (= |v_#memory_int_50| (store |v_#memory_int_127| |v_ULTIMATE.start_sll_insert_~snd_to_last~0#1.base_32| (store (select |v_#memory_int_127| |v_ULTIMATE.start_sll_insert_~snd_to_last~0#1.base_32|) (+ |v_ULTIMATE.start_sll_insert_~snd_to_last~0#1.offset_32| 4) (select (select |v_#memory_int_50| |v_ULTIMATE.start_sll_insert_~snd_to_last~0#1.base_32|) (+ |v_ULTIMATE.start_sll_insert_~snd_to_last~0#1.offset_32| 4))))) (= (store |v_#memory_$Pointer$.base_108| |v_ULTIMATE.start_sll_insert_~snd_to_last~0#1.base_32| (store (select |v_#memory_$Pointer$.base_108| |v_ULTIMATE.start_sll_insert_~snd_to_last~0#1.base_32|) (+ |v_ULTIMATE.start_sll_insert_~snd_to_last~0#1.offset_32| 4) |v_ULTIMATE.start_sll_insert_~new_node~0#1.base_29|)) |v_#memory_$Pointer$.base_50|) (or (not (= |v_ULTIMATE.start_sll_insert_~snd_to_last~0#1.offset_32| 0)) (not (= |v_ULTIMATE.start_sll_insert_~snd_to_last~0#1.base_32| 0))))) (= (store |v_#memory_$Pointer$.base_50| |v_ULTIMATE.start_sll_insert_~new_node~0#1.base_29| (store (select |v_#memory_$Pointer$.base_50| |v_ULTIMATE.start_sll_insert_~new_node~0#1.base_29|) 4 (select (select |#memory_$Pointer$.base| |v_ULTIMATE.start_sll_insert_~new_node~0#1.base_29|) 4))) |#memory_$Pointer$.base|) (= |#memory_int| (store |v_#memory_int_50| |v_ULTIMATE.start_sll_insert_~new_node~0#1.base_29| (store (select |v_#memory_int_50| |v_ULTIMATE.start_sll_insert_~new_node~0#1.base_29|) 4 (select (select |#memory_int| |v_ULTIMATE.start_sll_insert_~new_node~0#1.base_29|) 4)))) (= |#memory_$Pointer$.offset| (store |v_#memory_$Pointer$.offset_50| |v_ULTIMATE.start_sll_insert_~new_node~0#1.base_29| (store (select |v_#memory_$Pointer$.offset_50| |v_ULTIMATE.start_sll_insert_~new_node~0#1.base_29|) 4 (select (select |#memory_$Pointer$.offset| |v_ULTIMATE.start_sll_insert_~new_node~0#1.base_29|) 4)))))) (= (select (select |#memory_$Pointer$.offset| |ULTIMATE.start_main_~ptr~0#1.base|) (+ |ULTIMATE.start_main_~ptr~0#1.offset| 4)) |ULTIMATE.start_main_~temp~2#1.offset|))' at error location [2023-11-23 21:32:26,626 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-23 21:32:26,626 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-11-23 21:32:26,626 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16] total 27 [2023-11-23 21:32:26,627 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1540310773] [2023-11-23 21:32:26,627 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-11-23 21:32:26,627 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 27 states [2023-11-23 21:32:26,627 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:32:26,628 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 27 interpolants. [2023-11-23 21:32:26,630 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=113, Invalid=1573, Unknown=40, NotChecked=80, Total=1806 [2023-11-23 21:32:26,630 INFO L87 Difference]: Start difference. First operand 23 states and 31 transitions. Second operand has 27 states, 22 states have (on average 1.3181818181818181) internal successors, (29), 22 states have internal predecessors, (29), 4 states have call successors, (4), 2 states have call predecessors, (4), 4 states have return successors, (6), 6 states have call predecessors, (6), 4 states have call successors, (6) [2023-11-23 21:32:31,744 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:32:31,745 INFO L93 Difference]: Finished difference Result 31 states and 41 transitions. [2023-11-23 21:32:31,745 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2023-11-23 21:32:31,746 INFO L78 Accepts]: Start accepts. Automaton has has 27 states, 22 states have (on average 1.3181818181818181) internal successors, (29), 22 states have internal predecessors, (29), 4 states have call successors, (4), 2 states have call predecessors, (4), 4 states have return successors, (6), 6 states have call predecessors, (6), 4 states have call successors, (6) Word has length 24 [2023-11-23 21:32:31,746 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:32:31,747 INFO L225 Difference]: With dead ends: 31 [2023-11-23 21:32:31,747 INFO L226 Difference]: Without dead ends: 29 [2023-11-23 21:32:31,749 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 75 GetRequests, 29 SyntacticMatches, 0 SemanticMatches, 46 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 362 ImplicationChecksByTransitivity, 13.7s TimeCoverageRelationStatistics Valid=144, Invalid=1976, Unknown=46, NotChecked=90, Total=2256 [2023-11-23 21:32:31,750 INFO L413 NwaCegarLoop]: 12 mSDtfsCounter, 11 mSDsluCounter, 113 mSDsCounter, 0 mSdLazyCounter, 371 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 125 SdHoareTripleChecker+Invalid, 372 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 371 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.8s IncrementalHoareTripleChecker+Time [2023-11-23 21:32:31,750 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [11 Valid, 125 Invalid, 372 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 371 Invalid, 0 Unknown, 0 Unchecked, 0.8s Time] [2023-11-23 21:32:31,751 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2023-11-23 21:32:31,760 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 26. [2023-11-23 21:32:31,760 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 21 states have (on average 1.4285714285714286) internal successors, (30), 21 states have internal predecessors, (30), 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) [2023-11-23 21:32:31,761 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 36 transitions. [2023-11-23 21:32:31,762 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 36 transitions. Word has length 24 [2023-11-23 21:32:31,762 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:32:31,762 INFO L495 AbstractCegarLoop]: Abstraction has 26 states and 36 transitions. [2023-11-23 21:32:31,762 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 27 states, 22 states have (on average 1.3181818181818181) internal successors, (29), 22 states have internal predecessors, (29), 4 states have call successors, (4), 2 states have call predecessors, (4), 4 states have return successors, (6), 6 states have call predecessors, (6), 4 states have call successors, (6) [2023-11-23 21:32:31,763 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 36 transitions. [2023-11-23 21:32:31,763 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2023-11-23 21:32:31,764 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:32:31,764 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:32:31,790 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_331067c8-cce1-431b-b67e-e0f49cebe9f0/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2023-11-23 21:32:31,985 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_331067c8-cce1-431b-b67e-e0f49cebe9f0/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:32:31,986 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:32:31,986 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:32:31,986 INFO L85 PathProgramCache]: Analyzing trace with hash 617509303, now seen corresponding path program 1 times [2023-11-23 21:32:31,986 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:32:31,986 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [621998766] [2023-11-23 21:32:31,986 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:32:31,986 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:32:32,045 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:32:32,914 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 9 proven. 3 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-11-23 21:32:32,914 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:32:32,914 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [621998766] [2023-11-23 21:32:32,914 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [621998766] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:32:32,914 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [740361384] [2023-11-23 21:32:32,915 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:32:32,915 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:32:32,915 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_331067c8-cce1-431b-b67e-e0f49cebe9f0/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:32:32,916 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_331067c8-cce1-431b-b67e-e0f49cebe9f0/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:32:32,941 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_331067c8-cce1-431b-b67e-e0f49cebe9f0/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-11-23 21:32:33,080 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:32:33,084 INFO L262 TraceCheckSpWp]: Trace formula consists of 351 conjuncts, 45 conjunts are in the unsatisfiable core [2023-11-23 21:32:33,091 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 21:32:33,396 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 10 [2023-11-23 21:32:33,526 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-23 21:32:33,527 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 19 [2023-11-23 21:32:33,781 INFO L349 Elim1Store]: treesize reduction 29, result has 19.4 percent of original size [2023-11-23 21:32:33,781 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 3 new quantified variables, introduced 1 case distinctions, treesize of input 44 treesize of output 37 [2023-11-23 21:32:33,788 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-23 21:32:33,790 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 25 treesize of output 13 [2023-11-23 21:32:33,826 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 9 proven. 3 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-11-23 21:32:33,827 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-23 21:32:33,858 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-11-23 21:32:33,859 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 2 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 67 treesize of output 88 [2023-11-23 21:32:33,875 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-11-23 21:32:33,875 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 2 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 61 treesize of output 82 [2023-11-23 21:32:34,942 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [740361384] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:32:34,942 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2112317261] [2023-11-23 21:32:34,945 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-11-23 21:32:34,945 INFO L166 IcfgInterpreter]: Building call graph [2023-11-23 21:32:34,946 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-23 21:32:34,946 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-23 21:32:34,946 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-23 21:32:36,504 INFO L197 IcfgInterpreter]: Interpreting procedure node_create with input of size 65 for LOIs [2023-11-23 21:32:36,640 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-23 21:32:42,182 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '851#(and (<= 1 |#StackHeapBarrier|) (= (select (select |#memory_$Pointer$.base| |ULTIMATE.start_main_~#s~0#1.base|) 0) 0) (= |ULTIMATE.start_main_~mid_index~0#1| 1) (exists ((|v_#memory_$Pointer$.offset_50| (Array Int (Array Int Int))) (|v_#memory_int_147| (Array Int (Array Int Int))) (|v_ULTIMATE.start_sll_insert_~snd_to_last~0#1.offset_37| Int) (|v_ULTIMATE.start_sll_insert_~head#1.base_25| Int) (|v_ULTIMATE.start_sll_insert_~snd_to_last~0#1.base_37| Int) (|v_#memory_$Pointer$.base_50| (Array Int (Array Int Int))) (|v_#memory_$Pointer$.base_126| (Array Int (Array Int Int))) (|v_#memory_$Pointer$.offset_122| (Array Int (Array Int Int))) (|v_ULTIMATE.start_sll_insert_~new_node~0#1.base_32| Int) (|v_#memory_int_50| (Array Int (Array Int Int)))) (and (= (store |v_#memory_$Pointer$.base_50| |v_ULTIMATE.start_sll_insert_~new_node~0#1.base_32| (store (select |v_#memory_$Pointer$.base_50| |v_ULTIMATE.start_sll_insert_~new_node~0#1.base_32|) 4 (select (select |#memory_$Pointer$.base| |v_ULTIMATE.start_sll_insert_~new_node~0#1.base_32|) 4))) |#memory_$Pointer$.base|) (= |#memory_int| (store |v_#memory_int_50| |v_ULTIMATE.start_sll_insert_~new_node~0#1.base_32| (store (select |v_#memory_int_50| |v_ULTIMATE.start_sll_insert_~new_node~0#1.base_32|) 4 (select (select |#memory_int| |v_ULTIMATE.start_sll_insert_~new_node~0#1.base_32|) 4)))) (= |#memory_$Pointer$.offset| (store |v_#memory_$Pointer$.offset_50| |v_ULTIMATE.start_sll_insert_~new_node~0#1.base_32| (store (select |v_#memory_$Pointer$.offset_50| |v_ULTIMATE.start_sll_insert_~new_node~0#1.base_32|) 4 (select (select |#memory_$Pointer$.offset| |v_ULTIMATE.start_sll_insert_~new_node~0#1.base_32|) 4)))) (or (and (= |v_#memory_$Pointer$.offset_50| (store |v_#memory_$Pointer$.offset_122| |v_ULTIMATE.start_sll_insert_~head#1.base_25| (store (select |v_#memory_$Pointer$.offset_122| |v_ULTIMATE.start_sll_insert_~head#1.base_25|) 0 0))) (= |v_#memory_int_50| (store |v_#memory_int_147| |v_ULTIMATE.start_sll_insert_~head#1.base_25| (store (select |v_#memory_int_147| |v_ULTIMATE.start_sll_insert_~head#1.base_25|) 0 (select (select |v_#memory_int_50| |v_ULTIMATE.start_sll_insert_~head#1.base_25|) 0)))) (= (store |v_#memory_$Pointer$.base_126| |v_ULTIMATE.start_sll_insert_~head#1.base_25| (store (select |v_#memory_$Pointer$.base_126| |v_ULTIMATE.start_sll_insert_~head#1.base_25|) 0 |v_ULTIMATE.start_sll_insert_~new_node~0#1.base_32|)) |v_#memory_$Pointer$.base_50|) (= |v_ULTIMATE.start_sll_insert_~snd_to_last~0#1.base_37| 0) (= |v_ULTIMATE.start_sll_insert_~snd_to_last~0#1.offset_37| 0)) (and (= (store |v_#memory_$Pointer$.base_126| |v_ULTIMATE.start_sll_insert_~snd_to_last~0#1.base_37| (store (select |v_#memory_$Pointer$.base_126| |v_ULTIMATE.start_sll_insert_~snd_to_last~0#1.base_37|) (+ |v_ULTIMATE.start_sll_insert_~snd_to_last~0#1.offset_37| 4) |v_ULTIMATE.start_sll_insert_~new_node~0#1.base_32|)) |v_#memory_$Pointer$.base_50|) (= |v_#memory_int_50| (store |v_#memory_int_147| |v_ULTIMATE.start_sll_insert_~snd_to_last~0#1.base_37| (store (select |v_#memory_int_147| |v_ULTIMATE.start_sll_insert_~snd_to_last~0#1.base_37|) (+ |v_ULTIMATE.start_sll_insert_~snd_to_last~0#1.offset_37| 4) (select (select |v_#memory_int_50| |v_ULTIMATE.start_sll_insert_~snd_to_last~0#1.base_37|) (+ |v_ULTIMATE.start_sll_insert_~snd_to_last~0#1.offset_37| 4))))) (or (not (= |v_ULTIMATE.start_sll_insert_~snd_to_last~0#1.offset_37| 0)) (not (= |v_ULTIMATE.start_sll_insert_~snd_to_last~0#1.base_37| 0))) (= (store |v_#memory_$Pointer$.offset_122| |v_ULTIMATE.start_sll_insert_~snd_to_last~0#1.base_37| (store (select |v_#memory_$Pointer$.offset_122| |v_ULTIMATE.start_sll_insert_~snd_to_last~0#1.base_37|) (+ |v_ULTIMATE.start_sll_insert_~snd_to_last~0#1.offset_37| 4) 0)) |v_#memory_$Pointer$.offset_50|))) (<= 2 |v_ULTIMATE.start_sll_insert_~head#1.base_25|))) (not (= 5 (select (select |#memory_int| 0) 0))) (= |ULTIMATE.start_main_~uneq~0#1| 5) (= |ULTIMATE.start_main_~ptr~0#1.offset| 0) (= |ULTIMATE.start_main_~count~0#1| 0) (= |ULTIMATE.start_main_~ptr~0#1.base| 0) (= |ULTIMATE.start_sll_create_#res#1.offset| 0) (= |ULTIMATE.start_main_~data~0#1| 1) (= (select (select |#memory_$Pointer$.offset| |ULTIMATE.start_main_~#s~0#1.base|) 0) 0) (= |ULTIMATE.start_main_~#s~0#1.offset| 0) (= |ULTIMATE.start_main_~len~0#1| 2) (<= 2 |ULTIMATE.start_main_~#s~0#1.base|))' at error location [2023-11-23 21:32:42,183 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-23 21:32:42,183 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-11-23 21:32:42,183 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15] total 29 [2023-11-23 21:32:42,183 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [586243380] [2023-11-23 21:32:42,183 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-11-23 21:32:42,184 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 29 states [2023-11-23 21:32:42,184 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:32:42,185 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 29 interpolants. [2023-11-23 21:32:42,186 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=152, Invalid=1816, Unknown=12, NotChecked=0, Total=1980 [2023-11-23 21:32:42,187 INFO L87 Difference]: Start difference. First operand 26 states and 36 transitions. Second operand has 29 states, 23 states have (on average 1.391304347826087) internal successors, (32), 23 states have internal predecessors, (32), 4 states have call successors, (4), 4 states have call predecessors, (4), 6 states have return successors, (6), 6 states have call predecessors, (6), 4 states have call successors, (6) [2023-11-23 21:32:43,258 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:32:43,259 INFO L93 Difference]: Finished difference Result 32 states and 44 transitions. [2023-11-23 21:32:43,260 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2023-11-23 21:32:43,260 INFO L78 Accepts]: Start accepts. Automaton has has 29 states, 23 states have (on average 1.391304347826087) internal successors, (32), 23 states have internal predecessors, (32), 4 states have call successors, (4), 4 states have call predecessors, (4), 6 states have return successors, (6), 6 states have call predecessors, (6), 4 states have call successors, (6) Word has length 24 [2023-11-23 21:32:43,261 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:32:43,262 INFO L225 Difference]: With dead ends: 32 [2023-11-23 21:32:43,262 INFO L226 Difference]: Without dead ends: 26 [2023-11-23 21:32:43,263 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 76 GetRequests, 26 SyntacticMatches, 0 SemanticMatches, 50 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 610 ImplicationChecksByTransitivity, 7.3s TimeCoverageRelationStatistics Valid=221, Invalid=2419, Unknown=12, NotChecked=0, Total=2652 [2023-11-23 21:32:43,264 INFO L413 NwaCegarLoop]: 13 mSDtfsCounter, 60 mSDsluCounter, 163 mSDsCounter, 0 mSdLazyCounter, 363 mSolverCounterSat, 11 mSolverCounterUnsat, 4 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 61 SdHoareTripleChecker+Valid, 176 SdHoareTripleChecker+Invalid, 378 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 11 IncrementalHoareTripleChecker+Valid, 363 IncrementalHoareTripleChecker+Invalid, 4 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2023-11-23 21:32:43,265 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [61 Valid, 176 Invalid, 378 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [11 Valid, 363 Invalid, 4 Unknown, 0 Unchecked, 0.6s Time] [2023-11-23 21:32:43,265 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2023-11-23 21:32:43,275 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2023-11-23 21:32:43,275 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 21 states have (on average 1.380952380952381) internal successors, (29), 21 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) [2023-11-23 21:32:43,276 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 35 transitions. [2023-11-23 21:32:43,276 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 35 transitions. Word has length 24 [2023-11-23 21:32:43,276 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:32:43,277 INFO L495 AbstractCegarLoop]: Abstraction has 26 states and 35 transitions. [2023-11-23 21:32:43,277 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 29 states, 23 states have (on average 1.391304347826087) internal successors, (32), 23 states have internal predecessors, (32), 4 states have call successors, (4), 4 states have call predecessors, (4), 6 states have return successors, (6), 6 states have call predecessors, (6), 4 states have call successors, (6) [2023-11-23 21:32:43,277 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 35 transitions. [2023-11-23 21:32:43,278 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2023-11-23 21:32:43,278 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:32:43,278 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:32:43,296 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_331067c8-cce1-431b-b67e-e0f49cebe9f0/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2023-11-23 21:32:43,485 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_331067c8-cce1-431b-b67e-e0f49cebe9f0/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:32:43,486 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:32:43,486 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:32:43,486 INFO L85 PathProgramCache]: Analyzing trace with hash 1862421249, now seen corresponding path program 3 times [2023-11-23 21:32:43,486 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:32:43,486 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [252541724] [2023-11-23 21:32:43,486 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:32:43,487 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:32:43,517 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:32:43,692 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 3 proven. 4 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2023-11-23 21:32:43,693 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:32:43,693 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [252541724] [2023-11-23 21:32:43,693 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [252541724] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:32:43,693 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1388867270] [2023-11-23 21:32:43,693 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-11-23 21:32:43,694 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:32:43,694 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_331067c8-cce1-431b-b67e-e0f49cebe9f0/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:32:43,695 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_331067c8-cce1-431b-b67e-e0f49cebe9f0/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:32:43,705 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_331067c8-cce1-431b-b67e-e0f49cebe9f0/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-11-23 21:32:44,405 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-11-23 21:32:44,405 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-23 21:32:44,409 INFO L262 TraceCheckSpWp]: Trace formula consists of 367 conjuncts, 10 conjunts are in the unsatisfiable core [2023-11-23 21:32:44,412 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 21:32:44,473 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 4 proven. 4 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2023-11-23 21:32:44,473 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-23 21:32:44,580 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2023-11-23 21:32:44,580 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1388867270] provided 1 perfect and 1 imperfect interpolant sequences [2023-11-23 21:32:44,581 INFO L185 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2023-11-23 21:32:44,581 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [6, 7] total 11 [2023-11-23 21:32:44,582 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [710266363] [2023-11-23 21:32:44,582 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:32:44,583 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-11-23 21:32:44,583 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:32:44,587 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-11-23 21:32:44,587 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=38, Invalid=72, Unknown=0, NotChecked=0, Total=110 [2023-11-23 21:32:44,588 INFO L87 Difference]: Start difference. First operand 26 states and 35 transitions. Second operand has 7 states, 7 states have (on average 2.142857142857143) internal successors, (15), 7 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) [2023-11-23 21:32:44,669 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:32:44,669 INFO L93 Difference]: Finished difference Result 34 states and 47 transitions. [2023-11-23 21:32:44,669 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-11-23 21:32:44,670 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 2.142857142857143) internal successors, (15), 7 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) Word has length 25 [2023-11-23 21:32:44,670 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:32:44,670 INFO L225 Difference]: With dead ends: 34 [2023-11-23 21:32:44,671 INFO L226 Difference]: Without dead ends: 25 [2023-11-23 21:32:44,671 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 56 GetRequests, 44 SyntacticMatches, 1 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 20 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=52, Invalid=104, Unknown=0, NotChecked=0, Total=156 [2023-11-23 21:32:44,672 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 32 mSDsluCounter, 35 mSDsCounter, 0 mSdLazyCounter, 27 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 32 SdHoareTripleChecker+Valid, 51 SdHoareTripleChecker+Invalid, 31 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 27 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-23 21:32:44,672 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [32 Valid, 51 Invalid, 31 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 27 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-23 21:32:44,673 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2023-11-23 21:32:44,682 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 25. [2023-11-23 21:32:44,682 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 25 states, 20 states have (on average 1.3) internal successors, (26), 20 states have internal predecessors, (26), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-11-23 21:32:44,683 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 25 states to 25 states and 32 transitions. [2023-11-23 21:32:44,683 INFO L78 Accepts]: Start accepts. Automaton has 25 states and 32 transitions. Word has length 25 [2023-11-23 21:32:44,683 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:32:44,684 INFO L495 AbstractCegarLoop]: Abstraction has 25 states and 32 transitions. [2023-11-23 21:32:44,684 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 2.142857142857143) internal successors, (15), 7 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) [2023-11-23 21:32:44,684 INFO L276 IsEmpty]: Start isEmpty. Operand 25 states and 32 transitions. [2023-11-23 21:32:44,685 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2023-11-23 21:32:44,685 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:32:44,685 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:32:44,701 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_331067c8-cce1-431b-b67e-e0f49cebe9f0/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2023-11-23 21:32:44,889 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_331067c8-cce1-431b-b67e-e0f49cebe9f0/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:32:44,890 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:32:44,890 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:32:44,890 INFO L85 PathProgramCache]: Analyzing trace with hash 644968873, now seen corresponding path program 1 times [2023-11-23 21:32:44,890 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:32:44,890 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1410026093] [2023-11-23 21:32:44,890 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:32:44,891 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:32:44,971 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:32:45,202 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 1 proven. 2 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2023-11-23 21:32:45,202 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:32:45,203 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1410026093] [2023-11-23 21:32:45,203 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1410026093] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:32:45,203 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1260875419] [2023-11-23 21:32:45,203 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:32:45,203 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:32:45,204 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_331067c8-cce1-431b-b67e-e0f49cebe9f0/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:32:45,204 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_331067c8-cce1-431b-b67e-e0f49cebe9f0/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:32:45,225 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_331067c8-cce1-431b-b67e-e0f49cebe9f0/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2023-11-23 21:32:45,379 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:32:45,381 INFO L262 TraceCheckSpWp]: Trace formula consists of 372 conjuncts, 12 conjunts are in the unsatisfiable core [2023-11-23 21:32:45,383 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 21:32:45,411 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 1 proven. 2 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2023-11-23 21:32:45,411 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-23 21:32:45,480 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 1 proven. 2 refuted. 0 times theorem prover too weak. 14 trivial. 0 not checked. [2023-11-23 21:32:45,480 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1260875419] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-23 21:32:45,480 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [689885459] [2023-11-23 21:32:45,483 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-11-23 21:32:45,483 INFO L166 IcfgInterpreter]: Building call graph [2023-11-23 21:32:45,483 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-23 21:32:45,483 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-23 21:32:45,484 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-23 21:32:46,847 INFO L197 IcfgInterpreter]: Interpreting procedure node_create with input of size 65 for LOIs [2023-11-23 21:32:46,980 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-23 21:32:48,530 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1368#(and (<= 0 |ULTIMATE.start_main_~count~0#1|) (<= 1 |#StackHeapBarrier|) (= |ULTIMATE.start_main_~mid_index~0#1| 1) (not (= (select (select |#memory_int| |ULTIMATE.start_main_~ptr~0#1.base|) |ULTIMATE.start_main_~ptr~0#1.offset|) 1)) (= |ULTIMATE.start_main_~uneq~0#1| 5) (or (not (= |ULTIMATE.start_main_~ptr~0#1.base| 0)) (not (= |ULTIMATE.start_main_~ptr~0#1.offset| 0))) (= |ULTIMATE.start_main_~temp~2#1.base| (select (select |#memory_$Pointer$.base| |ULTIMATE.start_main_~ptr~0#1.base|) (+ |ULTIMATE.start_main_~ptr~0#1.offset| 4))) (= |ULTIMATE.start_sll_create_#res#1.offset| 0) (= |ULTIMATE.start_main_~data~0#1| 1) (not (= |ULTIMATE.start_main_~count~0#1| 1)) (= |ULTIMATE.start_main_~#s~0#1.offset| 0) (= |ULTIMATE.start_main_~len~0#1| 2) (= (select (select |#memory_$Pointer$.offset| |ULTIMATE.start_main_~ptr~0#1.base|) (+ |ULTIMATE.start_main_~ptr~0#1.offset| 4)) |ULTIMATE.start_main_~temp~2#1.offset|) (<= 2 |ULTIMATE.start_main_~#s~0#1.base|))' at error location [2023-11-23 21:32:48,530 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-23 21:32:48,530 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-23 21:32:48,530 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 11 [2023-11-23 21:32:48,531 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [810284488] [2023-11-23 21:32:48,531 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-23 21:32:48,531 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2023-11-23 21:32:48,531 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:32:48,532 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2023-11-23 21:32:48,532 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=74, Invalid=432, Unknown=0, NotChecked=0, Total=506 [2023-11-23 21:32:48,533 INFO L87 Difference]: Start difference. First operand 25 states and 32 transitions. Second operand has 11 states, 11 states have (on average 2.090909090909091) internal successors, (23), 11 states have internal predecessors, (23), 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) [2023-11-23 21:32:48,682 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:32:48,682 INFO L93 Difference]: Finished difference Result 34 states and 43 transitions. [2023-11-23 21:32:48,682 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-11-23 21:32:48,682 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 11 states have (on average 2.090909090909091) internal successors, (23), 11 states have internal predecessors, (23), 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) Word has length 26 [2023-11-23 21:32:48,683 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:32:48,683 INFO L225 Difference]: With dead ends: 34 [2023-11-23 21:32:48,683 INFO L226 Difference]: Without dead ends: 26 [2023-11-23 21:32:48,684 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 83 GetRequests, 61 SyntacticMatches, 0 SemanticMatches, 22 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 97 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=86, Invalid=466, Unknown=0, NotChecked=0, Total=552 [2023-11-23 21:32:48,685 INFO L413 NwaCegarLoop]: 13 mSDtfsCounter, 23 mSDsluCounter, 63 mSDsCounter, 0 mSdLazyCounter, 77 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 23 SdHoareTripleChecker+Valid, 76 SdHoareTripleChecker+Invalid, 77 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 77 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-23 21:32:48,685 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [23 Valid, 76 Invalid, 77 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 77 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-23 21:32:48,686 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2023-11-23 21:32:48,695 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 24. [2023-11-23 21:32:48,695 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 19 states have (on average 1.2105263157894737) internal successors, (23), 19 states have internal predecessors, (23), 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) [2023-11-23 21:32:48,696 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 29 transitions. [2023-11-23 21:32:48,696 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 29 transitions. Word has length 26 [2023-11-23 21:32:48,696 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:32:48,696 INFO L495 AbstractCegarLoop]: Abstraction has 24 states and 29 transitions. [2023-11-23 21:32:48,697 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 11 states have (on average 2.090909090909091) internal successors, (23), 11 states have internal predecessors, (23), 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) [2023-11-23 21:32:48,697 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 29 transitions. [2023-11-23 21:32:48,698 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2023-11-23 21:32:48,698 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:32:48,698 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:32:48,724 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_331067c8-cce1-431b-b67e-e0f49cebe9f0/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2023-11-23 21:32:48,918 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_331067c8-cce1-431b-b67e-e0f49cebe9f0/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2023-11-23 21:32:48,919 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:32:48,919 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:32:48,919 INFO L85 PathProgramCache]: Analyzing trace with hash 645047954, now seen corresponding path program 1 times [2023-11-23 21:32:48,919 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:32:48,919 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1507237607] [2023-11-23 21:32:48,920 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:32:48,920 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:32:48,975 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat