./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/list-simple/sll2n_prepend_equal.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_0957ce3b-9ea0-4b69-90cf-eb40a762bb4f/bin/utaipan-verify-mE87zJ7Ire/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0957ce3b-9ea0-4b69-90cf-eb40a762bb4f/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_0957ce3b-9ea0-4b69-90cf-eb40a762bb4f/bin/utaipan-verify-mE87zJ7Ire/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0957ce3b-9ea0-4b69-90cf-eb40a762bb4f/bin/utaipan-verify-mE87zJ7Ire/config/TaipanReach.xml -i ../../sv-benchmarks/c/list-simple/sll2n_prepend_equal.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0957ce3b-9ea0-4b69-90cf-eb40a762bb4f/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_0957ce3b-9ea0-4b69-90cf-eb40a762bb4f/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 e4cb0386e6b22b9d67dd4f4c4c33eb167dcf1836f99794e4424c5e73e6fc14d4 --- Real Ultimate output --- This is Ultimate 0.2.3-dev-30e01a7 [2023-11-23 21:13:46,720 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-11-23 21:13:46,804 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0957ce3b-9ea0-4b69-90cf-eb40a762bb4f/bin/utaipan-verify-mE87zJ7Ire/config/svcomp-Reach-32bit-Taipan_Default.epf [2023-11-23 21:13:46,810 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-11-23 21:13:46,811 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-11-23 21:13:46,851 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-11-23 21:13:46,852 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-11-23 21:13:46,852 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-11-23 21:13:46,853 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-11-23 21:13:46,859 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-11-23 21:13:46,859 INFO L153 SettingsManager]: * User list type=DISABLED [2023-11-23 21:13:46,860 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-11-23 21:13:46,861 INFO L153 SettingsManager]: * Explicit value domain=true [2023-11-23 21:13:46,862 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-11-23 21:13:46,863 INFO L153 SettingsManager]: * Octagon Domain=false [2023-11-23 21:13:46,863 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-11-23 21:13:46,864 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-11-23 21:13:46,864 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-11-23 21:13:46,864 INFO L153 SettingsManager]: * Interval Domain=false [2023-11-23 21:13:46,865 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-11-23 21:13:46,865 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-11-23 21:13:46,866 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2023-11-23 21:13:46,867 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-11-23 21:13:46,868 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-11-23 21:13:46,868 INFO L153 SettingsManager]: * sizeof long=4 [2023-11-23 21:13:46,868 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-11-23 21:13:46,869 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-11-23 21:13:46,869 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-11-23 21:13:46,870 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-11-23 21:13:46,870 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-11-23 21:13:46,871 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-11-23 21:13:46,872 INFO L153 SettingsManager]: * sizeof long double=12 [2023-11-23 21:13:46,872 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2023-11-23 21:13:46,872 INFO L153 SettingsManager]: * Use constant arrays=true [2023-11-23 21:13:46,881 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-11-23 21:13:46,881 INFO L153 SettingsManager]: * Only consider context switches at boundaries of atomic blocks=true [2023-11-23 21:13:46,882 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-11-23 21:13:46,882 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-23 21:13:46,883 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-11-23 21:13:46,883 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-11-23 21:13:46,884 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2023-11-23 21:13:46,884 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-11-23 21:13:46,884 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-11-23 21:13:46,885 INFO L153 SettingsManager]: * Apply one-shot large block encoding in concurrent analysis=false [2023-11-23 21:13:46,885 INFO L153 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-11-23 21:13:46,885 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-11-23 21:13:46,886 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-11-23 21:13:46,886 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_0957ce3b-9ea0-4b69-90cf-eb40a762bb4f/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0957ce3b-9ea0-4b69-90cf-eb40a762bb4f/bin/utaipan-verify-mE87zJ7Ire Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> e4cb0386e6b22b9d67dd4f4c4c33eb167dcf1836f99794e4424c5e73e6fc14d4 [2023-11-23 21:13:47,183 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-11-23 21:13:47,211 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-11-23 21:13:47,214 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-11-23 21:13:47,216 INFO L270 PluginConnector]: Initializing CDTParser... [2023-11-23 21:13:47,217 INFO L274 PluginConnector]: CDTParser initialized [2023-11-23 21:13:47,218 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0957ce3b-9ea0-4b69-90cf-eb40a762bb4f/bin/utaipan-verify-mE87zJ7Ire/../../sv-benchmarks/c/list-simple/sll2n_prepend_equal.i [2023-11-23 21:13:50,567 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-11-23 21:13:50,894 INFO L384 CDTParser]: Found 1 translation units. [2023-11-23 21:13:50,898 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0957ce3b-9ea0-4b69-90cf-eb40a762bb4f/sv-benchmarks/c/list-simple/sll2n_prepend_equal.i [2023-11-23 21:13:50,931 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0957ce3b-9ea0-4b69-90cf-eb40a762bb4f/bin/utaipan-verify-mE87zJ7Ire/data/80e927865/ad1aa01bcc0f4120baf0de0905f9f204/FLAG3328a2db0 [2023-11-23 21:13:50,951 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0957ce3b-9ea0-4b69-90cf-eb40a762bb4f/bin/utaipan-verify-mE87zJ7Ire/data/80e927865/ad1aa01bcc0f4120baf0de0905f9f204 [2023-11-23 21:13:50,958 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-11-23 21:13:50,962 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-11-23 21:13:50,966 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-11-23 21:13:50,967 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-11-23 21:13:50,973 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-11-23 21:13:50,976 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 09:13:50" (1/1) ... [2023-11-23 21:13:50,977 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@68d2bdd6 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:13:50, skipping insertion in model container [2023-11-23 21:13:50,978 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 09:13:50" (1/1) ... [2023-11-23 21:13:51,040 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-11-23 21:13:51,502 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_0957ce3b-9ea0-4b69-90cf-eb40a762bb4f/sv-benchmarks/c/list-simple/sll2n_prepend_equal.i[24076,24089] [2023-11-23 21:13:51,508 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-23 21:13:51,520 INFO L202 MainTranslator]: Completed pre-run [2023-11-23 21:13:51,567 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_0957ce3b-9ea0-4b69-90cf-eb40a762bb4f/sv-benchmarks/c/list-simple/sll2n_prepend_equal.i[24076,24089] [2023-11-23 21:13:51,568 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-23 21:13:51,605 INFO L206 MainTranslator]: Completed translation [2023-11-23 21:13:51,605 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:13:51 WrapperNode [2023-11-23 21:13:51,606 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-11-23 21:13:51,607 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-11-23 21:13:51,607 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-11-23 21:13:51,607 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-11-23 21:13:51,615 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:13:51" (1/1) ... [2023-11-23 21:13:51,629 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:13:51" (1/1) ... [2023-11-23 21:13:51,655 INFO L138 Inliner]: procedures = 127, calls = 30, calls flagged for inlining = 6, calls inlined = 6, statements flattened = 105 [2023-11-23 21:13:51,655 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-11-23 21:13:51,656 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-11-23 21:13:51,656 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-11-23 21:13:51,656 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-11-23 21:13:51,665 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:13:51" (1/1) ... [2023-11-23 21:13:51,666 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:13:51" (1/1) ... [2023-11-23 21:13:51,669 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:13:51" (1/1) ... [2023-11-23 21:13:51,670 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:13:51" (1/1) ... [2023-11-23 21:13:51,678 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:13:51" (1/1) ... [2023-11-23 21:13:51,682 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:13:51" (1/1) ... [2023-11-23 21:13:51,684 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:13:51" (1/1) ... [2023-11-23 21:13:51,686 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:13:51" (1/1) ... [2023-11-23 21:13:51,689 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-11-23 21:13:51,690 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-11-23 21:13:51,690 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-11-23 21:13:51,691 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-11-23 21:13:51,691 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:13:51" (1/1) ... [2023-11-23 21:13:51,697 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-23 21:13:51,712 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0957ce3b-9ea0-4b69-90cf-eb40a762bb4f/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:13:51,725 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0957ce3b-9ea0-4b69-90cf-eb40a762bb4f/bin/utaipan-verify-mE87zJ7Ire/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-11-23 21:13:51,743 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0957ce3b-9ea0-4b69-90cf-eb40a762bb4f/bin/utaipan-verify-mE87zJ7Ire/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-11-23 21:13:51,770 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-11-23 21:13:51,771 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-11-23 21:13:51,771 INFO L130 BoogieDeclarations]: Found specification of procedure node_create [2023-11-23 21:13:51,771 INFO L138 BoogieDeclarations]: Found implementation of procedure node_create [2023-11-23 21:13:51,771 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2023-11-23 21:13:51,772 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-11-23 21:13:51,772 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2023-11-23 21:13:51,772 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2023-11-23 21:13:51,772 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2023-11-23 21:13:51,773 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-11-23 21:13:51,773 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~$Pointer$ [2023-11-23 21:13:51,775 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-11-23 21:13:51,775 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-11-23 21:13:51,776 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-11-23 21:13:51,899 INFO L241 CfgBuilder]: Building ICFG [2023-11-23 21:13:51,901 INFO L267 CfgBuilder]: Building CFG for each procedure with an implementation [2023-11-23 21:13:52,213 INFO L282 CfgBuilder]: Performing block encoding [2023-11-23 21:13:52,304 INFO L304 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-11-23 21:13:52,305 INFO L309 CfgBuilder]: Removed 3 assume(true) statements. [2023-11-23 21:13:52,306 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 09:13:52 BoogieIcfgContainer [2023-11-23 21:13:52,307 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-11-23 21:13:52,310 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-11-23 21:13:52,310 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-11-23 21:13:52,313 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-11-23 21:13:52,314 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.11 09:13:50" (1/3) ... [2023-11-23 21:13:52,315 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@25b8eb47 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 09:13:52, skipping insertion in model container [2023-11-23 21:13:52,315 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:13:51" (2/3) ... [2023-11-23 21:13:52,315 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@25b8eb47 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 09:13:52, skipping insertion in model container [2023-11-23 21:13:52,316 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 09:13:52" (3/3) ... [2023-11-23 21:13:52,317 INFO L112 eAbstractionObserver]: Analyzing ICFG sll2n_prepend_equal.i [2023-11-23 21:13:52,336 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-11-23 21:13:52,336 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-11-23 21:13:52,398 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-11-23 21:13:52,406 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;@3e7e1074, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-11-23 21:13:52,407 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-11-23 21:13:52,412 INFO L276 IsEmpty]: Start isEmpty. Operand has 18 states, 13 states have (on average 1.5384615384615385) internal successors, (20), 14 states have internal predecessors, (20), 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 21:13:52,421 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2023-11-23 21:13:52,421 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:13:52,422 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:13:52,422 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:13:52,431 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:13:52,431 INFO L85 PathProgramCache]: Analyzing trace with hash 1742641309, now seen corresponding path program 1 times [2023-11-23 21:13:52,443 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:13:52,444 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2021380559] [2023-11-23 21:13:52,444 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:13:52,445 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:13:52,617 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:13:52,885 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 21:13:52,885 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:13:52,886 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2021380559] [2023-11-23 21:13:52,886 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2021380559] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 21:13:52,887 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-23 21:13:52,887 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-11-23 21:13:52,889 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1552359556] [2023-11-23 21:13:52,890 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:13:52,894 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-23 21:13:52,894 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:13:52,924 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-23 21:13:52,925 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-23 21:13:52,927 INFO L87 Difference]: Start difference. First operand has 18 states, 13 states have (on average 1.5384615384615385) internal successors, (20), 14 states have internal predecessors, (20), 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 2.6666666666666665) internal successors, (8), 3 states have internal predecessors, (8), 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 21:13:52,981 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:13:52,981 INFO L93 Difference]: Finished difference Result 35 states and 47 transitions. [2023-11-23 21:13:52,983 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-23 21:13:52,984 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 3 states have internal predecessors, (8), 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 10 [2023-11-23 21:13:52,984 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:13:52,991 INFO L225 Difference]: With dead ends: 35 [2023-11-23 21:13:52,991 INFO L226 Difference]: Without dead ends: 17 [2023-11-23 21:13:52,994 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 21:13:52,998 INFO L413 NwaCegarLoop]: 14 mSDtfsCounter, 1 mSDsluCounter, 14 mSDsCounter, 0 mSdLazyCounter, 17 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 28 SdHoareTripleChecker+Invalid, 17 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 17 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-23 21:13:52,999 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [2 Valid, 28 Invalid, 17 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 17 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-23 21:13:53,016 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 17 states. [2023-11-23 21:13:53,033 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 17 to 15. [2023-11-23 21:13:53,034 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 15 states, 11 states have (on average 1.2727272727272727) internal successors, (14), 11 states have internal predecessors, (14), 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 21:13:53,035 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 18 transitions. [2023-11-23 21:13:53,036 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 18 transitions. Word has length 10 [2023-11-23 21:13:53,037 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:13:53,037 INFO L495 AbstractCegarLoop]: Abstraction has 15 states and 18 transitions. [2023-11-23 21:13:53,037 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 3 states have internal predecessors, (8), 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 21:13:53,038 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 18 transitions. [2023-11-23 21:13:53,039 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2023-11-23 21:13:53,039 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:13:53,039 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:13:53,040 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-11-23 21:13:53,040 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:13:53,041 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:13:53,041 INFO L85 PathProgramCache]: Analyzing trace with hash 1529906914, now seen corresponding path program 1 times [2023-11-23 21:13:53,041 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:13:53,042 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [235144781] [2023-11-23 21:13:53,042 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:13:53,042 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:13:53,119 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:13:53,279 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 21:13:53,280 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:13:53,280 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [235144781] [2023-11-23 21:13:53,280 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [235144781] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:13:53,280 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1974308741] [2023-11-23 21:13:53,280 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:13:53,281 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:13:53,281 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0957ce3b-9ea0-4b69-90cf-eb40a762bb4f/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:13:53,283 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0957ce3b-9ea0-4b69-90cf-eb40a762bb4f/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:13:53,306 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0957ce3b-9ea0-4b69-90cf-eb40a762bb4f/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-11-23 21:13:53,440 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:13:53,443 INFO L262 TraceCheckSpWp]: Trace formula consists of 236 conjuncts, 5 conjunts are in the unsatisfiable core [2023-11-23 21:13:53,449 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 21:13:53,500 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 21:13:53,500 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-23 21:13:53,531 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 21:13:53,532 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1974308741] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-23 21:13:53,532 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [137484701] [2023-11-23 21:13:53,557 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2023-11-23 21:13:53,558 INFO L166 IcfgInterpreter]: Building call graph [2023-11-23 21:13:53,562 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-23 21:13:53,568 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-23 21:13:53,569 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-23 21:13:56,019 INFO L197 IcfgInterpreter]: Interpreting procedure node_create with input of size 137 for LOIs [2023-11-23 21:13:56,361 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-23 21:14:06,686 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '187#(and (exists ((|v_#memory_int_63| (Array Int (Array Int Int))) (|v_#memory_$Pointer$.base_52| (Array Int (Array Int Int))) (|v_#memory_$Pointer$.offset_52| (Array Int (Array Int Int))) (|v_ULTIMATE.start_sll_prepend_~head#1.base_14| Int) (|v_#memory_int_25| (Array Int (Array Int Int))) (|v_ULTIMATE.start_sll_prepend_#in~head#1.base_11| Int)) (and (= (store (store |v_#memory_$Pointer$.base_52| (select (select |#memory_$Pointer$.base| |v_ULTIMATE.start_sll_prepend_~head#1.base_14|) 0) (store (select |v_#memory_$Pointer$.base_52| (select (select |#memory_$Pointer$.base| |v_ULTIMATE.start_sll_prepend_~head#1.base_14|) 0)) 4 (select (select |v_#memory_$Pointer$.base_52| |v_ULTIMATE.start_sll_prepend_~head#1.base_14|) 0))) |v_ULTIMATE.start_sll_prepend_~head#1.base_14| (store (select (store |v_#memory_$Pointer$.base_52| (select (select |#memory_$Pointer$.base| |v_ULTIMATE.start_sll_prepend_~head#1.base_14|) 0) (store (select |v_#memory_$Pointer$.base_52| (select (select |#memory_$Pointer$.base| |v_ULTIMATE.start_sll_prepend_~head#1.base_14|) 0)) 4 (select (select |v_#memory_$Pointer$.base_52| |v_ULTIMATE.start_sll_prepend_~head#1.base_14|) 0))) |v_ULTIMATE.start_sll_prepend_~head#1.base_14|) 0 (select (select |#memory_$Pointer$.base| |v_ULTIMATE.start_sll_prepend_~head#1.base_14|) 0))) |#memory_$Pointer$.base|) (or (and (exists ((|v_#memory_$Pointer$.offset_51| (Array Int (Array Int Int)))) (= (select (select (store |v_#memory_$Pointer$.offset_51| |ULTIMATE.start_sll_create_#res#1.base| (store (select |v_#memory_$Pointer$.offset_51| |ULTIMATE.start_sll_create_#res#1.base|) 4 0)) |ULTIMATE.start_main_~#s~0#1.base|) 0) 0)) (exists ((|v_old(#memory_$Pointer$.base)_AFTER_CALL_10| (Array Int (Array Int Int))) (|v_#memory_$Pointer$.base_51| (Array Int (Array Int Int)))) (and (= (select (select |v_old(#memory_$Pointer$.base)_AFTER_CALL_10| |ULTIMATE.start_main_~#s~0#1.base|) 0) |ULTIMATE.start_sll_create_#res#1.base|) (= |v_old(#memory_$Pointer$.base)_AFTER_CALL_10| (store |v_#memory_$Pointer$.base_51| |ULTIMATE.start_sll_create_#res#1.base| (store (select |v_#memory_$Pointer$.base_51| |ULTIMATE.start_sll_create_#res#1.base|) 4 (select (select |v_old(#memory_$Pointer$.base)_AFTER_CALL_10| |ULTIMATE.start_sll_create_#res#1.base|) 4)))))) (exists ((|v_#memory_int_62| (Array Int (Array Int Int))) (|v_old(#memory_int)_AFTER_CALL_10| (Array Int (Array Int Int)))) (= |v_old(#memory_int)_AFTER_CALL_10| (store |v_#memory_int_62| |ULTIMATE.start_sll_create_#res#1.base| (store (select |v_#memory_int_62| |ULTIMATE.start_sll_create_#res#1.base|) 4 (select (select |v_old(#memory_int)_AFTER_CALL_10| |ULTIMATE.start_sll_create_#res#1.base|) 4))))) (exists ((|v_#length_23| (Array Int Int))) (= |#length| (store |v_#length_23| (select (select |#memory_$Pointer$.base| |v_ULTIMATE.start_sll_prepend_~head#1.base_14|) 0) 8))) (= |v_ULTIMATE.start_sll_prepend_~head#1.base_14| |v_ULTIMATE.start_sll_prepend_#in~head#1.base_11|) (exists ((|v_#memory_$Pointer$.base_48| (Array Int (Array Int Int)))) (= (store |v_#memory_$Pointer$.base_48| (select (select |#memory_$Pointer$.base| |v_ULTIMATE.start_sll_prepend_~head#1.base_14|) 0) (store (store (select |v_#memory_$Pointer$.base_48| (select (select |#memory_$Pointer$.base| |v_ULTIMATE.start_sll_prepend_~head#1.base_14|) 0)) 4 0) 0 (select (select |v_#memory_$Pointer$.base_52| (select (select |#memory_$Pointer$.base| |v_ULTIMATE.start_sll_prepend_~head#1.base_14|) 0)) 0))) |v_#memory_$Pointer$.base_52|)) (exists ((|v_#memory_int_37| (Array Int (Array Int Int))) (|v_#memory_int_59| (Array Int (Array Int Int)))) (and (= (store |v_#memory_int_37| (select (select |#memory_$Pointer$.base| |v_ULTIMATE.start_sll_prepend_~head#1.base_14|) 0) (store (select |v_#memory_int_37| (select (select |#memory_$Pointer$.base| |v_ULTIMATE.start_sll_prepend_~head#1.base_14|) 0)) 0 1)) |v_#memory_int_63|) (= (store |v_#memory_int_59| (select (select |#memory_$Pointer$.base| |v_ULTIMATE.start_sll_prepend_~head#1.base_14|) 0) (store (select |v_#memory_int_59| (select (select |#memory_$Pointer$.base| |v_ULTIMATE.start_sll_prepend_~head#1.base_14|) 0)) 4 (select (select |v_#memory_int_37| (select (select |#memory_$Pointer$.base| |v_ULTIMATE.start_sll_prepend_~head#1.base_14|) 0)) 4))) |v_#memory_int_37|))) (exists ((|v_#memory_$Pointer$.offset_48| (Array Int (Array Int Int)))) (= (store |v_#memory_$Pointer$.offset_48| (select (select |#memory_$Pointer$.base| |v_ULTIMATE.start_sll_prepend_~head#1.base_14|) 0) (store (store (select |v_#memory_$Pointer$.offset_48| (select (select |#memory_$Pointer$.base| |v_ULTIMATE.start_sll_prepend_~head#1.base_14|) 0)) 4 0) 0 (select (select |v_#memory_$Pointer$.offset_52| (select (select |#memory_$Pointer$.base| |v_ULTIMATE.start_sll_prepend_~head#1.base_14|) 0)) 0))) |v_#memory_$Pointer$.offset_52|)) (exists ((|v_#valid_33| (Array Int Int))) (and (= (store |v_#valid_33| (select (select |#memory_$Pointer$.base| |v_ULTIMATE.start_sll_prepend_~head#1.base_14|) 0) 1) |#valid|) (= (select |v_#valid_33| (select (select |#memory_$Pointer$.base| |v_ULTIMATE.start_sll_prepend_~head#1.base_14|) 0)) 0))) (= |v_ULTIMATE.start_sll_prepend_#in~head#1.base_11| |ULTIMATE.start_main_~#s~0#1.base|) (<= (+ 1 (select (select |#memory_$Pointer$.base| |v_ULTIMATE.start_sll_prepend_~head#1.base_14|) 0)) |#StackHeapBarrier|)) (and (exists ((|v_#memory_$Pointer$.offset_51| (Array Int (Array Int Int)))) (= (select (select (store |v_#memory_$Pointer$.offset_51| |ULTIMATE.start_sll_create_#res#1.base| (store (select |v_#memory_$Pointer$.offset_51| |ULTIMATE.start_sll_create_#res#1.base|) 4 0)) |ULTIMATE.start_main_~#s~0#1.base|) 0) 0)) (exists ((|v_#memory_$Pointer$.base_51| (Array Int (Array Int Int))) (|v_old(#memory_$Pointer$.base)_AFTER_CALL_9| (Array Int (Array Int Int)))) (and (= (select (select |v_old(#memory_$Pointer$.base)_AFTER_CALL_9| |ULTIMATE.start_main_~#s~0#1.base|) 0) |ULTIMATE.start_sll_create_#res#1.base|) (= |v_old(#memory_$Pointer$.base)_AFTER_CALL_9| (store |v_#memory_$Pointer$.base_51| |ULTIMATE.start_sll_create_#res#1.base| (store (select |v_#memory_$Pointer$.base_51| |ULTIMATE.start_sll_create_#res#1.base|) 4 (select (select |v_old(#memory_$Pointer$.base)_AFTER_CALL_9| |ULTIMATE.start_sll_create_#res#1.base|) 4)))))) (exists ((|v_#length_23| (Array Int Int))) (= |#length| (store |v_#length_23| (select (select |#memory_$Pointer$.base| |v_ULTIMATE.start_sll_prepend_~head#1.base_14|) 0) 8))) (= |v_ULTIMATE.start_sll_prepend_~head#1.base_14| |v_ULTIMATE.start_sll_prepend_#in~head#1.base_11|) (exists ((|v_#memory_$Pointer$.base_48| (Array Int (Array Int Int)))) (= (store |v_#memory_$Pointer$.base_48| (select (select |#memory_$Pointer$.base| |v_ULTIMATE.start_sll_prepend_~head#1.base_14|) 0) (store (store (select |v_#memory_$Pointer$.base_48| (select (select |#memory_$Pointer$.base| |v_ULTIMATE.start_sll_prepend_~head#1.base_14|) 0)) 4 0) 0 (select (select |v_#memory_$Pointer$.base_52| (select (select |#memory_$Pointer$.base| |v_ULTIMATE.start_sll_prepend_~head#1.base_14|) 0)) 0))) |v_#memory_$Pointer$.base_52|)) (exists ((|v_#memory_int_37| (Array Int (Array Int Int))) (|v_#memory_int_59| (Array Int (Array Int Int)))) (and (= (store |v_#memory_int_37| (select (select |#memory_$Pointer$.base| |v_ULTIMATE.start_sll_prepend_~head#1.base_14|) 0) (store (select |v_#memory_int_37| (select (select |#memory_$Pointer$.base| |v_ULTIMATE.start_sll_prepend_~head#1.base_14|) 0)) 0 1)) |v_#memory_int_63|) (= (store |v_#memory_int_59| (select (select |#memory_$Pointer$.base| |v_ULTIMATE.start_sll_prepend_~head#1.base_14|) 0) (store (select |v_#memory_int_59| (select (select |#memory_$Pointer$.base| |v_ULTIMATE.start_sll_prepend_~head#1.base_14|) 0)) 4 (select (select |v_#memory_int_37| (select (select |#memory_$Pointer$.base| |v_ULTIMATE.start_sll_prepend_~head#1.base_14|) 0)) 4))) |v_#memory_int_37|))) (exists ((|v_#memory_$Pointer$.offset_48| (Array Int (Array Int Int)))) (= (store |v_#memory_$Pointer$.offset_48| (select (select |#memory_$Pointer$.base| |v_ULTIMATE.start_sll_prepend_~head#1.base_14|) 0) (store (store (select |v_#memory_$Pointer$.offset_48| (select (select |#memory_$Pointer$.base| |v_ULTIMATE.start_sll_prepend_~head#1.base_14|) 0)) 4 0) 0 (select (select |v_#memory_$Pointer$.offset_52| (select (select |#memory_$Pointer$.base| |v_ULTIMATE.start_sll_prepend_~head#1.base_14|) 0)) 0))) |v_#memory_$Pointer$.offset_52|)) (exists ((|v_#valid_33| (Array Int Int))) (and (= (store |v_#valid_33| (select (select |#memory_$Pointer$.base| |v_ULTIMATE.start_sll_prepend_~head#1.base_14|) 0) 1) |#valid|) (= (select |v_#valid_33| (select (select |#memory_$Pointer$.base| |v_ULTIMATE.start_sll_prepend_~head#1.base_14|) 0)) 0))) (exists ((|v_#memory_int_62| (Array Int (Array Int Int))) (|v_old(#memory_int)_AFTER_CALL_9| (Array Int (Array Int Int)))) (= (store |v_#memory_int_62| |ULTIMATE.start_sll_create_#res#1.base| (store (select |v_#memory_int_62| |ULTIMATE.start_sll_create_#res#1.base|) 4 (select (select |v_old(#memory_int)_AFTER_CALL_9| |ULTIMATE.start_sll_create_#res#1.base|) 4))) |v_old(#memory_int)_AFTER_CALL_9|)) (= |v_ULTIMATE.start_sll_prepend_#in~head#1.base_11| |ULTIMATE.start_main_~#s~0#1.base|) (<= (+ 1 (select (select |#memory_$Pointer$.base| |v_ULTIMATE.start_sll_prepend_~head#1.base_14|) 0)) |#StackHeapBarrier|))) (= (store |v_#memory_int_63| (select (select |#memory_$Pointer$.base| |v_ULTIMATE.start_sll_prepend_~head#1.base_14|) 0) (store (select |v_#memory_int_63| (select (select |#memory_$Pointer$.base| |v_ULTIMATE.start_sll_prepend_~head#1.base_14|) 0)) 4 (select (select |v_#memory_int_25| (select (select |#memory_$Pointer$.base| |v_ULTIMATE.start_sll_prepend_~head#1.base_14|) 0)) 4))) |v_#memory_int_25|) (= |#memory_int| (store |v_#memory_int_25| |v_ULTIMATE.start_sll_prepend_~head#1.base_14| (store (select |v_#memory_int_25| |v_ULTIMATE.start_sll_prepend_~head#1.base_14|) 0 (select (select |#memory_int| |v_ULTIMATE.start_sll_prepend_~head#1.base_14|) 0)))) (= |#memory_$Pointer$.offset| (store (store |v_#memory_$Pointer$.offset_52| (select (select |#memory_$Pointer$.base| |v_ULTIMATE.start_sll_prepend_~head#1.base_14|) 0) (store (select |v_#memory_$Pointer$.offset_52| (select (select |#memory_$Pointer$.base| |v_ULTIMATE.start_sll_prepend_~head#1.base_14|) 0)) 4 (select (select |v_#memory_$Pointer$.offset_52| |v_ULTIMATE.start_sll_prepend_~head#1.base_14|) 0))) |v_ULTIMATE.start_sll_prepend_~head#1.base_14| (store (select (store |v_#memory_$Pointer$.offset_52| (select (select |#memory_$Pointer$.base| |v_ULTIMATE.start_sll_prepend_~head#1.base_14|) 0) (store (select |v_#memory_$Pointer$.offset_52| (select (select |#memory_$Pointer$.base| |v_ULTIMATE.start_sll_prepend_~head#1.base_14|) 0)) 4 (select (select |v_#memory_$Pointer$.offset_52| |v_ULTIMATE.start_sll_prepend_~head#1.base_14|) 0))) |v_ULTIMATE.start_sll_prepend_~head#1.base_14|) 0 0))))) (not (= (select (select |#memory_int| |ULTIMATE.start_main_~ptr~0#1.base|) |ULTIMATE.start_main_~ptr~0#1.offset|) 1)) (= |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) (= (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 21:14:06,687 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-23 21:14:06,687 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-23 21:14:06,687 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 5 [2023-11-23 21:14:06,688 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [886995108] [2023-11-23 21:14:06,689 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-23 21:14:06,690 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-11-23 21:14:06,690 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:14:06,691 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-11-23 21:14:06,692 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=34, Invalid=204, Unknown=2, NotChecked=0, Total=240 [2023-11-23 21:14:06,692 INFO L87 Difference]: Start difference. First operand 15 states and 18 transitions. Second operand has 5 states, 5 states have (on average 3.0) internal successors, (15), 5 states have internal predecessors, (15), 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 21:14:06,738 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:14:06,739 INFO L93 Difference]: Finished difference Result 28 states and 34 transitions. [2023-11-23 21:14:06,739 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-11-23 21:14:06,739 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 3.0) internal successors, (15), 5 states have internal predecessors, (15), 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 16 [2023-11-23 21:14:06,740 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:14:06,740 INFO L225 Difference]: With dead ends: 28 [2023-11-23 21:14:06,741 INFO L226 Difference]: Without dead ends: 18 [2023-11-23 21:14:06,742 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 50 GetRequests, 34 SyntacticMatches, 2 SemanticMatches, 14 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 41 ImplicationChecksByTransitivity, 10.3s TimeCoverageRelationStatistics Valid=34, Invalid=204, Unknown=2, NotChecked=0, Total=240 [2023-11-23 21:14:06,744 INFO L413 NwaCegarLoop]: 10 mSDtfsCounter, 1 mSDsluCounter, 18 mSDsCounter, 0 mSdLazyCounter, 19 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 28 SdHoareTripleChecker+Invalid, 20 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 19 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-23 21:14:06,744 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [2 Valid, 28 Invalid, 20 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 19 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-23 21:14:06,746 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2023-11-23 21:14:06,749 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 18. [2023-11-23 21:14:06,749 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 18 states, 13 states have (on average 1.2307692307692308) internal successors, (16), 13 states have internal predecessors, (16), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-11-23 21:14:06,750 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 18 states to 18 states and 22 transitions. [2023-11-23 21:14:06,750 INFO L78 Accepts]: Start accepts. Automaton has 18 states and 22 transitions. Word has length 16 [2023-11-23 21:14:06,751 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:14:06,751 INFO L495 AbstractCegarLoop]: Abstraction has 18 states and 22 transitions. [2023-11-23 21:14:06,751 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 3.0) internal successors, (15), 5 states have internal predecessors, (15), 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 21:14:06,752 INFO L276 IsEmpty]: Start isEmpty. Operand 18 states and 22 transitions. [2023-11-23 21:14:06,752 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2023-11-23 21:14:06,753 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:14:06,753 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:14:06,775 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0957ce3b-9ea0-4b69-90cf-eb40a762bb4f/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-11-23 21:14:06,969 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0957ce3b-9ea0-4b69-90cf-eb40a762bb4f/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:14:06,969 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:14:06,970 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:14:06,970 INFO L85 PathProgramCache]: Analyzing trace with hash 451276135, now seen corresponding path program 2 times [2023-11-23 21:14:06,970 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:14:06,970 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1527930939] [2023-11-23 21:14:06,970 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:14:06,971 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:14:07,083 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:14:08,066 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2023-11-23 21:14:08,066 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:14:08,066 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1527930939] [2023-11-23 21:14:08,067 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1527930939] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 21:14:08,068 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-23 21:14:08,069 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [] total 9 [2023-11-23 21:14:08,069 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [115509321] [2023-11-23 21:14:08,070 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:14:08,070 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2023-11-23 21:14:08,071 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:14:08,072 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2023-11-23 21:14:08,073 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=16, Invalid=56, Unknown=0, NotChecked=0, Total=72 [2023-11-23 21:14:08,074 INFO L87 Difference]: Start difference. First operand 18 states and 22 transitions. Second operand has 9 states, 7 states have (on average 1.7142857142857142) internal successors, (12), 8 states have internal predecessors, (12), 2 states have call successors, (2), 1 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-11-23 21:14:08,260 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:14:08,260 INFO L93 Difference]: Finished difference Result 25 states and 29 transitions. [2023-11-23 21:14:08,263 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2023-11-23 21:14:08,264 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 7 states have (on average 1.7142857142857142) internal successors, (12), 8 states have internal predecessors, (12), 2 states have call successors, (2), 1 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 22 [2023-11-23 21:14:08,264 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:14:08,265 INFO L225 Difference]: With dead ends: 25 [2023-11-23 21:14:08,265 INFO L226 Difference]: Without dead ends: 23 [2023-11-23 21:14:08,265 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 13 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 11 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=35, Invalid=121, Unknown=0, NotChecked=0, Total=156 [2023-11-23 21:14:08,267 INFO L413 NwaCegarLoop]: 7 mSDtfsCounter, 17 mSDsluCounter, 29 mSDsCounter, 0 mSdLazyCounter, 76 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 18 SdHoareTripleChecker+Valid, 36 SdHoareTripleChecker+Invalid, 77 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 76 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-23 21:14:08,267 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [18 Valid, 36 Invalid, 77 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 76 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-23 21:14:08,268 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 23 states. [2023-11-23 21:14:08,273 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 23 to 20. [2023-11-23 21:14:08,274 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20 states, 15 states have (on average 1.2666666666666666) internal successors, (19), 15 states have internal predecessors, (19), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-11-23 21:14:08,275 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 25 transitions. [2023-11-23 21:14:08,275 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 25 transitions. Word has length 22 [2023-11-23 21:14:08,275 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:14:08,275 INFO L495 AbstractCegarLoop]: Abstraction has 20 states and 25 transitions. [2023-11-23 21:14:08,276 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 7 states have (on average 1.7142857142857142) internal successors, (12), 8 states have internal predecessors, (12), 2 states have call successors, (2), 1 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-11-23 21:14:08,276 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 25 transitions. [2023-11-23 21:14:08,277 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2023-11-23 21:14:08,277 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:14:08,277 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:14:08,277 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2023-11-23 21:14:08,277 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:14:08,278 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:14:08,278 INFO L85 PathProgramCache]: Analyzing trace with hash 451331160, now seen corresponding path program 1 times [2023-11-23 21:14:08,278 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:14:08,278 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1615783804] [2023-11-23 21:14:08,279 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:14:08,279 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:14:08,311 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:14:08,671 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2023-11-23 21:14:08,671 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:14:08,675 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1615783804] [2023-11-23 21:14:08,676 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1615783804] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 21:14:08,676 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-23 21:14:08,676 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [] total 7 [2023-11-23 21:14:08,677 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [929247176] [2023-11-23 21:14:08,679 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:14:08,679 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-11-23 21:14:08,680 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:14:08,680 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-11-23 21:14:08,684 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2023-11-23 21:14:08,685 INFO L87 Difference]: Start difference. First operand 20 states and 25 transitions. Second operand has 7 states, 5 states have (on average 2.4) internal successors, (12), 6 states have internal predecessors, (12), 2 states have call successors, (2), 1 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-11-23 21:14:08,751 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:14:08,751 INFO L93 Difference]: Finished difference Result 23 states and 27 transitions. [2023-11-23 21:14:08,752 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-11-23 21:14:08,752 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 5 states have (on average 2.4) internal successors, (12), 6 states have internal predecessors, (12), 2 states have call successors, (2), 1 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 22 [2023-11-23 21:14:08,752 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:14:08,753 INFO L225 Difference]: With dead ends: 23 [2023-11-23 21:14:08,753 INFO L226 Difference]: Without dead ends: 20 [2023-11-23 21:14:08,753 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=16, Invalid=40, Unknown=0, NotChecked=0, Total=56 [2023-11-23 21:14:08,755 INFO L413 NwaCegarLoop]: 10 mSDtfsCounter, 2 mSDsluCounter, 37 mSDsCounter, 0 mSdLazyCounter, 33 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 47 SdHoareTripleChecker+Invalid, 33 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 33 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-23 21:14:08,755 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [2 Valid, 47 Invalid, 33 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 33 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-23 21:14:08,756 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2023-11-23 21:14:08,760 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 20. [2023-11-23 21:14:08,760 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20 states, 15 states have (on average 1.2) internal successors, (18), 15 states have internal predecessors, (18), 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 21:14:08,761 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 24 transitions. [2023-11-23 21:14:08,761 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 24 transitions. Word has length 22 [2023-11-23 21:14:08,761 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:14:08,761 INFO L495 AbstractCegarLoop]: Abstraction has 20 states and 24 transitions. [2023-11-23 21:14:08,762 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 5 states have (on average 2.4) internal successors, (12), 6 states have internal predecessors, (12), 2 states have call successors, (2), 1 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-11-23 21:14:08,762 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 24 transitions. [2023-11-23 21:14:08,762 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2023-11-23 21:14:08,763 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:14:08,763 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:14:08,763 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2023-11-23 21:14:08,763 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:14:08,764 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:14:08,764 INFO L85 PathProgramCache]: Analyzing trace with hash -115297310, now seen corresponding path program 1 times [2023-11-23 21:14:08,764 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:14:08,764 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1169616230] [2023-11-23 21:14:08,764 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:14:08,764 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:14:08,819 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:14:10,695 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 6 proven. 7 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-11-23 21:14:10,696 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:14:10,696 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1169616230] [2023-11-23 21:14:10,696 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1169616230] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:14:10,696 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1524577507] [2023-11-23 21:14:10,696 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:14:10,697 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:14:10,697 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0957ce3b-9ea0-4b69-90cf-eb40a762bb4f/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:14:10,698 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0957ce3b-9ea0-4b69-90cf-eb40a762bb4f/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:14:10,700 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0957ce3b-9ea0-4b69-90cf-eb40a762bb4f/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-11-23 21:14:10,860 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:14:10,864 INFO L262 TraceCheckSpWp]: Trace formula consists of 329 conjuncts, 102 conjunts are in the unsatisfiable core [2023-11-23 21:14:10,870 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 21:14:11,009 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2023-11-23 21:14:11,128 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 23 treesize of output 11 [2023-11-23 21:14:11,295 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 21 treesize of output 13 [2023-11-23 21:14:11,300 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 21:14:11,305 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 21:14:11,493 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-23 21:14:11,494 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 29 treesize of output 22 [2023-11-23 21:14:11,521 INFO L349 Elim1Store]: treesize reduction 21, result has 44.7 percent of original size [2023-11-23 21:14:11,521 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 1 new quantified variables, introduced 1 case distinctions, treesize of input 20 treesize of output 23 [2023-11-23 21:14:11,542 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-23 21:14:11,543 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 16 treesize of output 11 [2023-11-23 21:14:11,684 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-23 21:14:11,686 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-23 21:14:11,720 INFO L349 Elim1Store]: treesize reduction 29, result has 42.0 percent of original size [2023-11-23 21:14:11,721 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 1 case distinctions, treesize of input 45 treesize of output 39 [2023-11-23 21:14:11,730 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-23 21:14:11,733 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 103 treesize of output 43 [2023-11-23 21:14:11,742 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-23 21:14:11,746 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 51 treesize of output 22 [2023-11-23 21:14:12,096 INFO L349 Elim1Store]: treesize reduction 32, result has 70.6 percent of original size [2023-11-23 21:14:12,097 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 5 select indices, 5 select index equivalence classes, 0 disjoint index pairs (out of 10 index pairs), introduced 7 new quantified variables, introduced 10 case distinctions, treesize of input 126 treesize of output 148 [2023-11-23 21:14:12,248 INFO L349 Elim1Store]: treesize reduction 32, result has 70.6 percent of original size [2023-11-23 21:14:12,249 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 5 select indices, 5 select index equivalence classes, 0 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 10 case distinctions, treesize of input 70 treesize of output 126 [2023-11-23 21:14:14,667 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 6 proven. 7 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-11-23 21:14:14,667 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-23 21:14:15,199 WARN L854 $PredicateComparison]: unable to prove that (forall ((|v_ULTIMATE.start_sll_prepend_#t~ret7#1.base_21| Int) (v_ArrVal_372 (Array Int Int)) (v_ArrVal_375 (Array Int Int)) (v_ArrVal_386 (Array Int Int)) (v_ArrVal_387 (Array Int Int))) (let ((.cse4 (let ((.cse7 (store |c_#memory_$Pointer$.offset| |v_ULTIMATE.start_sll_prepend_#t~ret7#1.base_21| (store v_ArrVal_386 4 (select (select (store |c_#memory_$Pointer$.offset| |v_ULTIMATE.start_sll_prepend_#t~ret7#1.base_21| v_ArrVal_386) |c_ULTIMATE.start_sll_prepend_~head#1.base|) |c_ULTIMATE.start_sll_prepend_~head#1.offset|))))) (store .cse7 |c_ULTIMATE.start_sll_prepend_~head#1.base| (store (select .cse7 |c_ULTIMATE.start_sll_prepend_~head#1.base|) |c_ULTIMATE.start_sll_prepend_~head#1.offset| 0)))) (.cse1 (let ((.cse6 (store |c_#memory_$Pointer$.base| |v_ULTIMATE.start_sll_prepend_#t~ret7#1.base_21| (store v_ArrVal_387 4 (select (select (store |c_#memory_$Pointer$.base| |v_ULTIMATE.start_sll_prepend_#t~ret7#1.base_21| v_ArrVal_387) |c_ULTIMATE.start_sll_prepend_~head#1.base|) |c_ULTIMATE.start_sll_prepend_~head#1.offset|))))) (store .cse6 |c_ULTIMATE.start_sll_prepend_~head#1.base| (store (select .cse6 |c_ULTIMATE.start_sll_prepend_~head#1.base|) |c_ULTIMATE.start_sll_prepend_~head#1.offset| |v_ULTIMATE.start_sll_prepend_#t~ret7#1.base_21|))))) (let ((.cse0 (store (store |c_#memory_int| |v_ULTIMATE.start_sll_prepend_#t~ret7#1.base_21| v_ArrVal_372) |c_ULTIMATE.start_sll_prepend_~head#1.base| v_ArrVal_375)) (.cse2 (select (select .cse1 |c_ULTIMATE.start_main_~#s~0#1.base|) |c_ULTIMATE.start_main_~#s~0#1.offset|)) (.cse5 (select (select .cse4 |c_ULTIMATE.start_main_~#s~0#1.base|) |c_ULTIMATE.start_main_~#s~0#1.offset|))) (or (= |c_ULTIMATE.start_main_~data~0#1| (let ((.cse3 (+ .cse5 4))) (select (select .cse0 (select (select .cse1 .cse2) .cse3)) (select (select .cse4 .cse2) .cse3)))) (not (= |c_ULTIMATE.start_main_~data~0#1| (select (select .cse0 .cse2) .cse5))) (< |c_#StackHeapBarrier| (+ |v_ULTIMATE.start_sll_prepend_#t~ret7#1.base_21| 1)))))) is different from false [2023-11-23 21:14:15,205 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1524577507] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:14:15,205 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1062282557] [2023-11-23 21:14:15,208 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2023-11-23 21:14:15,208 INFO L166 IcfgInterpreter]: Building call graph [2023-11-23 21:14:15,208 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-23 21:14:15,208 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-23 21:14:15,209 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-23 21:14:16,647 INFO L197 IcfgInterpreter]: Interpreting procedure node_create with input of size 120 for LOIs [2023-11-23 21:14:16,919 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-23 21:14:22,173 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '538#(and (<= 0 |ULTIMATE.start_main_~count~0#1|) (<= 1 |#StackHeapBarrier|) (= |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) (<= 2 |ULTIMATE.start_main_~#s~0#1.base|))' at error location [2023-11-23 21:14:22,173 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-23 21:14:22,173 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-11-23 21:14:22,173 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [16, 16] total 30 [2023-11-23 21:14:22,174 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [23781996] [2023-11-23 21:14:22,174 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-11-23 21:14:22,174 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 30 states [2023-11-23 21:14:22,175 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:14:22,176 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 30 interpolants. [2023-11-23 21:14:22,177 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=120, Invalid=1773, Unknown=3, NotChecked=84, Total=1980 [2023-11-23 21:14:22,177 INFO L87 Difference]: Start difference. First operand 20 states and 24 transitions. Second operand has 30 states, 24 states have (on average 1.2916666666666667) internal successors, (31), 24 states have internal predecessors, (31), 4 states have call successors, (4), 3 states have call predecessors, (4), 5 states have return successors, (6), 6 states have call predecessors, (6), 4 states have call successors, (6) [2023-11-23 21:14:23,522 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:14:23,522 INFO L93 Difference]: Finished difference Result 27 states and 31 transitions. [2023-11-23 21:14:23,523 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2023-11-23 21:14:23,523 INFO L78 Accepts]: Start accepts. Automaton has has 30 states, 24 states have (on average 1.2916666666666667) internal successors, (31), 24 states have internal predecessors, (31), 4 states have call successors, (4), 3 states have call predecessors, (4), 5 states have return successors, (6), 6 states have call predecessors, (6), 4 states have call successors, (6) Word has length 24 [2023-11-23 21:14:23,523 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:14:23,524 INFO L225 Difference]: With dead ends: 27 [2023-11-23 21:14:23,524 INFO L226 Difference]: Without dead ends: 25 [2023-11-23 21:14:23,526 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 80 GetRequests, 27 SyntacticMatches, 0 SemanticMatches, 53 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 378 ImplicationChecksByTransitivity, 7.5s TimeCoverageRelationStatistics Valid=188, Invalid=2675, Unknown=3, NotChecked=104, Total=2970 [2023-11-23 21:14:23,527 INFO L413 NwaCegarLoop]: 8 mSDtfsCounter, 9 mSDsluCounter, 106 mSDsCounter, 0 mSdLazyCounter, 396 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 9 SdHoareTripleChecker+Valid, 114 SdHoareTripleChecker+Invalid, 400 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 396 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2023-11-23 21:14:23,528 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [9 Valid, 114 Invalid, 400 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 396 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2023-11-23 21:14:23,529 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2023-11-23 21:14:23,534 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 22. [2023-11-23 21:14:23,534 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22 states, 17 states have (on average 1.2352941176470589) internal successors, (21), 17 states have internal predecessors, (21), 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 21:14:23,535 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 27 transitions. [2023-11-23 21:14:23,535 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 27 transitions. Word has length 24 [2023-11-23 21:14:23,535 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:14:23,536 INFO L495 AbstractCegarLoop]: Abstraction has 22 states and 27 transitions. [2023-11-23 21:14:23,536 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 30 states, 24 states have (on average 1.2916666666666667) internal successors, (31), 24 states have internal predecessors, (31), 4 states have call successors, (4), 3 states have call predecessors, (4), 5 states have return successors, (6), 6 states have call predecessors, (6), 4 states have call successors, (6) [2023-11-23 21:14:23,536 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 27 transitions. [2023-11-23 21:14:23,537 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2023-11-23 21:14:23,537 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:14:23,537 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:14:23,559 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0957ce3b-9ea0-4b69-90cf-eb40a762bb4f/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2023-11-23 21:14:23,756 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0957ce3b-9ea0-4b69-90cf-eb40a762bb4f/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:14:23,756 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:14:23,757 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:14:23,757 INFO L85 PathProgramCache]: Analyzing trace with hash -115242285, now seen corresponding path program 1 times [2023-11-23 21:14:23,757 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:14:23,757 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [370390152] [2023-11-23 21:14:23,757 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:14:23,757 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:14:23,800 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:14:24,731 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 21:14:24,731 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:14:24,731 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [370390152] [2023-11-23 21:14:24,731 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [370390152] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:14:24,731 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1554959201] [2023-11-23 21:14:24,732 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:14:24,732 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:14:24,732 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0957ce3b-9ea0-4b69-90cf-eb40a762bb4f/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:14:24,733 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0957ce3b-9ea0-4b69-90cf-eb40a762bb4f/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:14:24,751 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_0957ce3b-9ea0-4b69-90cf-eb40a762bb4f/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-11-23 21:14:24,895 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:14:24,898 INFO L262 TraceCheckSpWp]: Trace formula consists of 326 conjuncts, 47 conjunts are in the unsatisfiable core [2023-11-23 21:14:24,902 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 21:14:24,953 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 8 treesize of output 4 [2023-11-23 21:14:25,046 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-23 21:14:25,047 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 17 treesize of output 12 [2023-11-23 21:14:25,104 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-23 21:14:25,107 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 68 treesize of output 18 [2023-11-23 21:14:25,178 INFO L349 Elim1Store]: treesize reduction 13, result has 7.1 percent of original size [2023-11-23 21:14:25,179 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 1 case distinctions, treesize of input 37 treesize of output 16 [2023-11-23 21:14:25,184 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 21:14:25,184 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-23 21:14:25,311 INFO L349 Elim1Store]: treesize reduction 46, result has 52.1 percent of original size [2023-11-23 21:14:25,312 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 854 treesize of output 840 [2023-11-23 21:14:25,322 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 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 390 treesize of output 388 [2023-11-23 21:14:25,349 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-11-23 21:14:25,350 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 3 case distinctions, treesize of input 438 treesize of output 450 [2023-11-23 21:14:25,379 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 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 10 treesize of output 6 [2023-11-23 21:14:25,421 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-11-23 21:14:25,421 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 33 treesize of output 37 [2023-11-23 21:14:25,509 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 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 6 treesize of output 4 [2023-11-23 21:14:27,798 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-11-23 21:14:27,799 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 5 select indices, 5 select index equivalence classes, 0 disjoint index pairs (out of 10 index pairs), introduced 5 new quantified variables, introduced 10 case distinctions, treesize of input 1083 treesize of output 1141