./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/list-simple/sll2c_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_349e7929-1de9-4532-837d-78c112023b3b/bin/utaipan-verify-mE87zJ7Ire/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_349e7929-1de9-4532-837d-78c112023b3b/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_349e7929-1de9-4532-837d-78c112023b3b/bin/utaipan-verify-mE87zJ7Ire/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_349e7929-1de9-4532-837d-78c112023b3b/bin/utaipan-verify-mE87zJ7Ire/config/TaipanReach.xml -i ../../sv-benchmarks/c/list-simple/sll2c_prepend_equal.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_349e7929-1de9-4532-837d-78c112023b3b/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_349e7929-1de9-4532-837d-78c112023b3b/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 f682d6a9f9df80cf11b356f08ea6be5ab5adaf1b414fc8a476877af8610cc552 --- Real Ultimate output --- This is Ultimate 0.2.3-dev-30e01a7 [2023-11-23 21:23:39,199 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-11-23 21:23:39,325 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_349e7929-1de9-4532-837d-78c112023b3b/bin/utaipan-verify-mE87zJ7Ire/config/svcomp-Reach-32bit-Taipan_Default.epf [2023-11-23 21:23:39,338 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-11-23 21:23:39,339 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-11-23 21:23:39,380 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-11-23 21:23:39,381 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-11-23 21:23:39,381 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-11-23 21:23:39,383 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-11-23 21:23:39,388 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-11-23 21:23:39,389 INFO L153 SettingsManager]: * User list type=DISABLED [2023-11-23 21:23:39,389 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-11-23 21:23:39,390 INFO L153 SettingsManager]: * Explicit value domain=true [2023-11-23 21:23:39,392 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-11-23 21:23:39,392 INFO L153 SettingsManager]: * Octagon Domain=false [2023-11-23 21:23:39,393 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-11-23 21:23:39,393 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-11-23 21:23:39,394 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-11-23 21:23:39,395 INFO L153 SettingsManager]: * Interval Domain=false [2023-11-23 21:23:39,395 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-11-23 21:23:39,396 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-11-23 21:23:39,397 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2023-11-23 21:23:39,398 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-11-23 21:23:39,398 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-11-23 21:23:39,399 INFO L153 SettingsManager]: * sizeof long=4 [2023-11-23 21:23:39,399 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-11-23 21:23:39,400 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-11-23 21:23:39,400 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-11-23 21:23:39,401 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-11-23 21:23:39,401 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-11-23 21:23:39,403 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-11-23 21:23:39,403 INFO L153 SettingsManager]: * sizeof long double=12 [2023-11-23 21:23:39,404 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2023-11-23 21:23:39,404 INFO L153 SettingsManager]: * Use constant arrays=true [2023-11-23 21:23:39,404 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-11-23 21:23:39,405 INFO L153 SettingsManager]: * Only consider context switches at boundaries of atomic blocks=true [2023-11-23 21:23:39,405 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-11-23 21:23:39,405 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-23 21:23:39,406 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-11-23 21:23:39,406 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-11-23 21:23:39,407 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2023-11-23 21:23:39,407 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-11-23 21:23:39,407 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-11-23 21:23:39,408 INFO L153 SettingsManager]: * Apply one-shot large block encoding in concurrent analysis=false [2023-11-23 21:23:39,408 INFO L153 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-11-23 21:23:39,409 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-11-23 21:23:39,409 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-11-23 21:23:39,409 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_349e7929-1de9-4532-837d-78c112023b3b/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_349e7929-1de9-4532-837d-78c112023b3b/bin/utaipan-verify-mE87zJ7Ire Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> f682d6a9f9df80cf11b356f08ea6be5ab5adaf1b414fc8a476877af8610cc552 [2023-11-23 21:23:39,702 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-11-23 21:23:39,736 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-11-23 21:23:39,739 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-11-23 21:23:39,742 INFO L270 PluginConnector]: Initializing CDTParser... [2023-11-23 21:23:39,742 INFO L274 PluginConnector]: CDTParser initialized [2023-11-23 21:23:39,744 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_349e7929-1de9-4532-837d-78c112023b3b/bin/utaipan-verify-mE87zJ7Ire/../../sv-benchmarks/c/list-simple/sll2c_prepend_equal.i [2023-11-23 21:23:42,852 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-11-23 21:23:43,103 INFO L384 CDTParser]: Found 1 translation units. [2023-11-23 21:23:43,107 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_349e7929-1de9-4532-837d-78c112023b3b/sv-benchmarks/c/list-simple/sll2c_prepend_equal.i [2023-11-23 21:23:43,123 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_349e7929-1de9-4532-837d-78c112023b3b/bin/utaipan-verify-mE87zJ7Ire/data/4aa0c0a23/5219b775cfbe4d20ac392ae31a52b76d/FLAG04dc06b95 [2023-11-23 21:23:43,138 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_349e7929-1de9-4532-837d-78c112023b3b/bin/utaipan-verify-mE87zJ7Ire/data/4aa0c0a23/5219b775cfbe4d20ac392ae31a52b76d [2023-11-23 21:23:43,140 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-11-23 21:23:43,142 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-11-23 21:23:43,144 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-11-23 21:23:43,144 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-11-23 21:23:43,150 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-11-23 21:23:43,151 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 09:23:43" (1/1) ... [2023-11-23 21:23:43,152 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@41751f15 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:23:43, skipping insertion in model container [2023-11-23 21:23:43,152 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 09:23:43" (1/1) ... [2023-11-23 21:23:43,195 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-11-23 21:23:43,517 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_349e7929-1de9-4532-837d-78c112023b3b/sv-benchmarks/c/list-simple/sll2c_prepend_equal.i[24458,24471] [2023-11-23 21:23:43,529 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-23 21:23:43,542 INFO L202 MainTranslator]: Completed pre-run [2023-11-23 21:23:43,626 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_349e7929-1de9-4532-837d-78c112023b3b/sv-benchmarks/c/list-simple/sll2c_prepend_equal.i[24458,24471] [2023-11-23 21:23:43,630 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-23 21:23:43,668 INFO L206 MainTranslator]: Completed translation [2023-11-23 21:23:43,669 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:23:43 WrapperNode [2023-11-23 21:23:43,669 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-11-23 21:23:43,670 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-11-23 21:23:43,671 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-11-23 21:23:43,671 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-11-23 21:23:43,679 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:23:43" (1/1) ... [2023-11-23 21:23:43,719 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:23:43" (1/1) ... [2023-11-23 21:23:43,757 INFO L138 Inliner]: procedures = 127, calls = 43, calls flagged for inlining = 6, calls inlined = 6, statements flattened = 140 [2023-11-23 21:23:43,757 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-11-23 21:23:43,758 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-11-23 21:23:43,758 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-11-23 21:23:43,758 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-11-23 21:23:43,768 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:23:43" (1/1) ... [2023-11-23 21:23:43,769 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:23:43" (1/1) ... [2023-11-23 21:23:43,790 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:23:43" (1/1) ... [2023-11-23 21:23:43,792 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:23:43" (1/1) ... [2023-11-23 21:23:43,800 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:23:43" (1/1) ... [2023-11-23 21:23:43,816 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:23:43" (1/1) ... [2023-11-23 21:23:43,821 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:23:43" (1/1) ... [2023-11-23 21:23:43,829 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:23:43" (1/1) ... [2023-11-23 21:23:43,833 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-11-23 21:23:43,834 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-11-23 21:23:43,841 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-11-23 21:23:43,842 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-11-23 21:23:43,843 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:23:43" (1/1) ... [2023-11-23 21:23:43,849 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-23 21:23:43,866 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_349e7929-1de9-4532-837d-78c112023b3b/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:23:43,879 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_349e7929-1de9-4532-837d-78c112023b3b/bin/utaipan-verify-mE87zJ7Ire/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-11-23 21:23:43,891 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_349e7929-1de9-4532-837d-78c112023b3b/bin/utaipan-verify-mE87zJ7Ire/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-11-23 21:23:43,922 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-11-23 21:23:43,922 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-11-23 21:23:43,923 INFO L130 BoogieDeclarations]: Found specification of procedure node_create [2023-11-23 21:23:43,923 INFO L138 BoogieDeclarations]: Found implementation of procedure node_create [2023-11-23 21:23:43,923 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2023-11-23 21:23:43,923 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-11-23 21:23:43,924 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2023-11-23 21:23:43,924 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2023-11-23 21:23:43,924 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2023-11-23 21:23:43,924 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-11-23 21:23:43,925 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~$Pointer$ [2023-11-23 21:23:43,925 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-11-23 21:23:43,925 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-11-23 21:23:43,925 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-11-23 21:23:44,058 INFO L241 CfgBuilder]: Building ICFG [2023-11-23 21:23:44,061 INFO L267 CfgBuilder]: Building CFG for each procedure with an implementation [2023-11-23 21:23:44,372 INFO L282 CfgBuilder]: Performing block encoding [2023-11-23 21:23:44,480 INFO L304 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-11-23 21:23:44,480 INFO L309 CfgBuilder]: Removed 4 assume(true) statements. [2023-11-23 21:23:44,482 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 09:23:44 BoogieIcfgContainer [2023-11-23 21:23:44,482 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-11-23 21:23:44,485 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-11-23 21:23:44,485 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-11-23 21:23:44,488 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-11-23 21:23:44,489 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.11 09:23:43" (1/3) ... [2023-11-23 21:23:44,489 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2c905776 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 09:23:44, skipping insertion in model container [2023-11-23 21:23:44,490 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:23:43" (2/3) ... [2023-11-23 21:23:44,490 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@2c905776 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 09:23:44, skipping insertion in model container [2023-11-23 21:23:44,490 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 09:23:44" (3/3) ... [2023-11-23 21:23:44,492 INFO L112 eAbstractionObserver]: Analyzing ICFG sll2c_prepend_equal.i [2023-11-23 21:23:44,512 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-11-23 21:23:44,512 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-11-23 21:23:44,560 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-11-23 21:23:44,567 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;@24465d41, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-11-23 21:23:44,568 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-11-23 21:23:44,573 INFO L276 IsEmpty]: Start isEmpty. Operand has 28 states, 22 states have (on average 1.5454545454545454) internal successors, (34), 23 states have internal predecessors, (34), 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 21:23:44,583 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2023-11-23 21:23:44,584 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:23:44,584 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:23:44,592 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:23:44,600 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:23:44,600 INFO L85 PathProgramCache]: Analyzing trace with hash 399683977, now seen corresponding path program 1 times [2023-11-23 21:23:44,610 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:23:44,610 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [657186022] [2023-11-23 21:23:44,611 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:23:44,611 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:23:44,795 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:23:45,164 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-11-23 21:23:45,165 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:23:45,165 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [657186022] [2023-11-23 21:23:45,166 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [657186022] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 21:23:45,166 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-23 21:23:45,167 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-11-23 21:23:45,170 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [565406284] [2023-11-23 21:23:45,172 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:23:45,178 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-23 21:23:45,180 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:23:45,249 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-23 21:23:45,250 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-23 21:23:45,253 INFO L87 Difference]: Start difference. First operand has 28 states, 22 states have (on average 1.5454545454545454) internal successors, (34), 23 states have internal predecessors, (34), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Second operand has 3 states, 3 states have (on average 3.6666666666666665) internal successors, (11), 3 states have internal predecessors, (11), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-11-23 21:23:45,329 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:23:45,330 INFO L93 Difference]: Finished difference Result 53 states and 76 transitions. [2023-11-23 21:23:45,331 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-23 21:23:45,332 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 3.6666666666666665) internal successors, (11), 3 states have internal predecessors, (11), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 17 [2023-11-23 21:23:45,333 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:23:45,340 INFO L225 Difference]: With dead ends: 53 [2023-11-23 21:23:45,340 INFO L226 Difference]: Without dead ends: 25 [2023-11-23 21:23:45,344 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 21:23:45,351 INFO L413 NwaCegarLoop]: 29 mSDtfsCounter, 1 mSDsluCounter, 27 mSDsCounter, 0 mSdLazyCounter, 15 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 56 SdHoareTripleChecker+Invalid, 15 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 15 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-23 21:23:45,352 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [2 Valid, 56 Invalid, 15 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 15 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-23 21:23:45,372 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2023-11-23 21:23:45,393 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 23. [2023-11-23 21:23:45,394 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23 states, 18 states have (on average 1.2777777777777777) internal successors, (23), 18 states have internal predecessors, (23), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-11-23 21:23:45,396 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 29 transitions. [2023-11-23 21:23:45,398 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 29 transitions. Word has length 17 [2023-11-23 21:23:45,398 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:23:45,399 INFO L495 AbstractCegarLoop]: Abstraction has 23 states and 29 transitions. [2023-11-23 21:23:45,400 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 3.6666666666666665) internal successors, (11), 3 states have internal predecessors, (11), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-11-23 21:23:45,400 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 29 transitions. [2023-11-23 21:23:45,402 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2023-11-23 21:23:45,402 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:23:45,403 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:23:45,403 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-11-23 21:23:45,404 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:23:45,405 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:23:45,406 INFO L85 PathProgramCache]: Analyzing trace with hash -953160270, now seen corresponding path program 1 times [2023-11-23 21:23:45,407 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:23:45,407 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [818602202] [2023-11-23 21:23:45,407 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:23:45,408 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:23:45,546 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:23:46,260 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 7 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-23 21:23:46,260 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:23:46,261 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [818602202] [2023-11-23 21:23:46,261 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [818602202] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:23:46,261 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1966863857] [2023-11-23 21:23:46,261 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:23:46,262 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:23:46,263 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_349e7929-1de9-4532-837d-78c112023b3b/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:23:46,264 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_349e7929-1de9-4532-837d-78c112023b3b/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:23:46,298 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_349e7929-1de9-4532-837d-78c112023b3b/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-11-23 21:23:46,472 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:23:46,476 INFO L262 TraceCheckSpWp]: Trace formula consists of 310 conjuncts, 28 conjunts are in the unsatisfiable core [2023-11-23 21:23:46,487 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 21:23:46,646 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 21:23:46,679 WARN L876 $PredicateComparison]: unable to prove that (exists ((|node_create_~temp~0#1.base| Int)) (and (<= (+ |node_create_~temp~0#1.base| 1) |c_#StackHeapBarrier|) (= |c_#memory_$Pointer$.base| (store |c_old(#memory_$Pointer$.base)| |node_create_~temp~0#1.base| (select |c_#memory_$Pointer$.base| |node_create_~temp~0#1.base|))))) is different from true [2023-11-23 21:23:46,713 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-23 21:23:46,718 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 21:23:46,744 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 16 treesize of output 8 [2023-11-23 21:23:46,762 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 7 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 1 not checked. [2023-11-23 21:23:46,762 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-23 21:23:46,870 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1966863857] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:23:46,870 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1902823984] [2023-11-23 21:23:46,906 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2023-11-23 21:23:46,906 INFO L166 IcfgInterpreter]: Building call graph [2023-11-23 21:23:46,910 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-23 21:23:46,916 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-23 21:23:46,916 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-23 21:23:48,957 INFO L197 IcfgInterpreter]: Interpreting procedure node_create with input of size 6 for LOIs [2023-11-23 21:23:48,970 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-23 21:24:02,815 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSifa [1902823984] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 21:24:02,816 INFO L185 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2023-11-23 21:24:02,816 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [15] imperfect sequences [13, 13] total 31 [2023-11-23 21:24:02,817 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2071675227] [2023-11-23 21:24:02,817 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:24:02,818 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2023-11-23 21:24:02,818 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:24:02,823 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2023-11-23 21:24:02,827 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=88, Invalid=838, Unknown=8, NotChecked=58, Total=992 [2023-11-23 21:24:02,831 INFO L87 Difference]: Start difference. First operand 23 states and 29 transitions. Second operand has 16 states, 12 states have (on average 1.0833333333333333) internal successors, (13), 11 states have internal predecessors, (13), 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 21:24:05,698 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2023-11-23 21:24:07,766 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:24:07,766 INFO L93 Difference]: Finished difference Result 28 states and 34 transitions. [2023-11-23 21:24:07,767 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 16 states. [2023-11-23 21:24:07,767 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 12 states have (on average 1.0833333333333333) internal successors, (13), 11 states have internal predecessors, (13), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Word has length 23 [2023-11-23 21:24:07,768 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:24:07,769 INFO L225 Difference]: With dead ends: 28 [2023-11-23 21:24:07,769 INFO L226 Difference]: Without dead ends: 26 [2023-11-23 21:24:07,770 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 66 GetRequests, 35 SyntacticMatches, 1 SemanticMatches, 30 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 240 ImplicationChecksByTransitivity, 14.1s TimeCoverageRelationStatistics Valid=88, Invalid=838, Unknown=8, NotChecked=58, Total=992 [2023-11-23 21:24:07,771 INFO L413 NwaCegarLoop]: 12 mSDtfsCounter, 1 mSDsluCounter, 55 mSDsCounter, 0 mSdLazyCounter, 254 mSolverCounterSat, 1 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 67 SdHoareTripleChecker+Invalid, 257 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 254 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.9s IncrementalHoareTripleChecker+Time [2023-11-23 21:24:07,772 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1 Valid, 67 Invalid, 257 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 254 Invalid, 2 Unknown, 0 Unchecked, 4.9s Time] [2023-11-23 21:24:07,773 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2023-11-23 21:24:07,779 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2023-11-23 21:24:07,780 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 21 states have (on average 1.2380952380952381) internal successors, (26), 21 states have internal predecessors, (26), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-11-23 21:24:07,781 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 32 transitions. [2023-11-23 21:24:07,781 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 32 transitions. Word has length 23 [2023-11-23 21:24:07,782 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:24:07,782 INFO L495 AbstractCegarLoop]: Abstraction has 26 states and 32 transitions. [2023-11-23 21:24:07,782 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 12 states have (on average 1.0833333333333333) internal successors, (13), 11 states have internal predecessors, (13), 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 21:24:07,783 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 32 transitions. [2023-11-23 21:24:07,784 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2023-11-23 21:24:07,784 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:24:07,784 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:24:07,807 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_349e7929-1de9-4532-837d-78c112023b3b/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-11-23 21:24:08,007 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_349e7929-1de9-4532-837d-78c112023b3b/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:24:08,007 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:24:08,008 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:24:08,008 INFO L85 PathProgramCache]: Analyzing trace with hash -1157107414, now seen corresponding path program 1 times [2023-11-23 21:24:08,008 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:24:08,008 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [212308700] [2023-11-23 21:24:08,009 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:24:08,009 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:24:08,075 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:24:08,540 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 7 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-23 21:24:08,541 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:24:08,541 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [212308700] [2023-11-23 21:24:08,541 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [212308700] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:24:08,541 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1681717392] [2023-11-23 21:24:08,542 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:24:08,542 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:24:08,542 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_349e7929-1de9-4532-837d-78c112023b3b/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:24:08,546 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_349e7929-1de9-4532-837d-78c112023b3b/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:24:08,547 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_349e7929-1de9-4532-837d-78c112023b3b/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-11-23 21:24:08,708 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:24:08,710 INFO L262 TraceCheckSpWp]: Trace formula consists of 326 conjuncts, 28 conjunts are in the unsatisfiable core [2023-11-23 21:24:08,714 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 21:24:08,779 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 21:24:08,794 WARN L876 $PredicateComparison]: unable to prove that (exists ((|node_create_~temp~0#1.base| Int)) (and (<= (+ |node_create_~temp~0#1.base| 1) |c_#StackHeapBarrier|) (= |c_#memory_$Pointer$.base| (store |c_old(#memory_$Pointer$.base)| |node_create_~temp~0#1.base| (select |c_#memory_$Pointer$.base| |node_create_~temp~0#1.base|))))) is different from true [2023-11-23 21:24:08,803 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-23 21:24:08,804 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 21:24:08,830 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 16 treesize of output 8 [2023-11-23 21:24:08,851 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 7 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 1 not checked. [2023-11-23 21:24:08,851 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-23 21:24:08,946 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1681717392] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:24:08,946 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1107702018] [2023-11-23 21:24:08,949 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2023-11-23 21:24:08,949 INFO L166 IcfgInterpreter]: Building call graph [2023-11-23 21:24:08,950 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-23 21:24:08,950 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-23 21:24:08,950 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-23 21:24:10,609 INFO L197 IcfgInterpreter]: Interpreting procedure node_create with input of size 6 for LOIs [2023-11-23 21:24:10,622 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-23 21:24:31,701 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '442#(and (<= 1 |#StackHeapBarrier|) (= |ULTIMATE.start_main_~count~0#1| 1) (exists ((|v_ULTIMATE.start_sll_circular_prepend_~new_head~1#1.base_15| Int) (|v_#memory_$Pointer$.base_76| (Array Int (Array Int Int))) (|v_#memory_int_88| (Array Int (Array Int Int))) (|v_#memory_int_15| (Array Int (Array Int Int))) (|v_ULTIMATE.start_sll_circular_prepend_#in~head#1.base_10| Int) (|v_ULTIMATE.start_sll_circular_prepend_~head#1.base_16| Int) (|v_#memory_$Pointer$.offset_70| (Array Int (Array Int Int)))) (and (= (store |v_#memory_int_15| |v_ULTIMATE.start_sll_circular_prepend_~new_head~1#1.base_15| (store (select |v_#memory_int_15| |v_ULTIMATE.start_sll_circular_prepend_~new_head~1#1.base_15|) 0 (select (select |#memory_int| |v_ULTIMATE.start_sll_circular_prepend_~new_head~1#1.base_15|) 0))) |#memory_int|) (= |v_#memory_int_15| (store |v_#memory_int_88| |v_ULTIMATE.start_sll_circular_prepend_~head#1.base_16| (store (select |v_#memory_int_88| |v_ULTIMATE.start_sll_circular_prepend_~head#1.base_16|) 0 (select (select |v_#memory_int_15| |v_ULTIMATE.start_sll_circular_prepend_~head#1.base_16|) 0)))) (= (store (store |v_#memory_$Pointer$.base_76| |v_ULTIMATE.start_sll_circular_prepend_~head#1.base_16| (store (select |v_#memory_$Pointer$.base_76| |v_ULTIMATE.start_sll_circular_prepend_~head#1.base_16|) 0 |v_ULTIMATE.start_sll_circular_prepend_~new_head~1#1.base_15|)) |v_ULTIMATE.start_sll_circular_prepend_~new_head~1#1.base_15| (store (select (store |v_#memory_$Pointer$.base_76| |v_ULTIMATE.start_sll_circular_prepend_~head#1.base_16| (store (select |v_#memory_$Pointer$.base_76| |v_ULTIMATE.start_sll_circular_prepend_~head#1.base_16|) 0 |v_ULTIMATE.start_sll_circular_prepend_~new_head~1#1.base_15|)) |v_ULTIMATE.start_sll_circular_prepend_~new_head~1#1.base_15|) 0 |v_ULTIMATE.start_sll_circular_prepend_~new_head~1#1.base_15|)) |#memory_$Pointer$.base|) (= (select (select |v_#memory_$Pointer$.offset_70| |v_ULTIMATE.start_sll_circular_prepend_~head#1.base_16|) 0) 0) (= (select (select |v_#memory_$Pointer$.base_76| |v_ULTIMATE.start_sll_circular_prepend_~head#1.base_16|) 0) 0) (or (and (= |v_ULTIMATE.start_sll_circular_prepend_#in~head#1.base_10| |v_ULTIMATE.start_sll_circular_prepend_~head#1.base_16|) (= |v_ULTIMATE.start_sll_circular_prepend_#in~head#1.base_10| |ULTIMATE.start_main_~#s~0#1.base|) (exists ((|v_#length_28| (Array Int Int))) (= |#length| (store |v_#length_28| |v_ULTIMATE.start_sll_circular_prepend_~new_head~1#1.base_15| 8))) (exists ((|v_#memory_int_84| (Array Int (Array Int Int))) (|v_#memory_int_41| (Array Int (Array Int Int)))) (and (= |v_#memory_int_41| (store |v_#memory_int_84| |v_ULTIMATE.start_sll_circular_prepend_~new_head~1#1.base_15| (store (select |v_#memory_int_84| |v_ULTIMATE.start_sll_circular_prepend_~new_head~1#1.base_15|) 0 (select (select |v_#memory_int_41| |v_ULTIMATE.start_sll_circular_prepend_~new_head~1#1.base_15|) 0)))) (= (store |v_#memory_int_41| |v_ULTIMATE.start_sll_circular_prepend_~new_head~1#1.base_15| (store (select |v_#memory_int_41| |v_ULTIMATE.start_sll_circular_prepend_~new_head~1#1.base_15|) 4 1)) |v_#memory_int_88|))) (exists ((|v_#memory_$Pointer$.base_75| (Array Int (Array Int Int))) (|v_old(#memory_int)_AFTER_CALL_26| (Array Int (Array Int Int))) (|v_#memory_int_87| (Array Int (Array Int Int))) (|v_#memory_$Pointer$.offset_69| (Array Int (Array Int Int))) (|v_ULTIMATE.start_sll_circular_create_~last~0#1.base_16| Int)) (and (= 0 (select (select (store |v_#memory_$Pointer$.offset_69| |v_ULTIMATE.start_sll_circular_create_~last~0#1.base_16| (store (select |v_#memory_$Pointer$.offset_69| |v_ULTIMATE.start_sll_circular_create_~last~0#1.base_16|) 0 0)) |ULTIMATE.start_main_~#s~0#1.base|) 0)) (= (select (select (store |v_#memory_$Pointer$.base_75| |v_ULTIMATE.start_sll_circular_create_~last~0#1.base_16| (store (select |v_#memory_$Pointer$.base_75| |v_ULTIMATE.start_sll_circular_create_~last~0#1.base_16|) 0 |ULTIMATE.start_sll_circular_create_#res#1.base|)) |ULTIMATE.start_main_~#s~0#1.base|) 0) |ULTIMATE.start_sll_circular_create_#res#1.base|) (= |v_old(#memory_int)_AFTER_CALL_26| (store |v_#memory_int_87| |v_ULTIMATE.start_sll_circular_create_~last~0#1.base_16| (store (select |v_#memory_int_87| |v_ULTIMATE.start_sll_circular_create_~last~0#1.base_16|) 0 (select (select |v_old(#memory_int)_AFTER_CALL_26| |v_ULTIMATE.start_sll_circular_create_~last~0#1.base_16|) 0)))))) (exists ((|v_#valid_40| (Array Int Int))) (and (= (store |v_#valid_40| |v_ULTIMATE.start_sll_circular_prepend_~new_head~1#1.base_15| 1) |#valid|) (= (select |v_#valid_40| |v_ULTIMATE.start_sll_circular_prepend_~new_head~1#1.base_15|) 0))) (exists ((|v_#memory_$Pointer$.base_72| (Array Int (Array Int Int)))) (= (store |v_#memory_$Pointer$.base_72| |v_ULTIMATE.start_sll_circular_prepend_~new_head~1#1.base_15| (store (store (select |v_#memory_$Pointer$.base_72| |v_ULTIMATE.start_sll_circular_prepend_~new_head~1#1.base_15|) 0 0) 4 (select (select |v_#memory_$Pointer$.base_76| |v_ULTIMATE.start_sll_circular_prepend_~new_head~1#1.base_15|) 4))) |v_#memory_$Pointer$.base_76|)) (exists ((|v_#memory_$Pointer$.offset_66| (Array Int (Array Int Int)))) (= (store |v_#memory_$Pointer$.offset_66| |v_ULTIMATE.start_sll_circular_prepend_~new_head~1#1.base_15| (store (store (select |v_#memory_$Pointer$.offset_66| |v_ULTIMATE.start_sll_circular_prepend_~new_head~1#1.base_15|) 0 0) 4 (select (select |v_#memory_$Pointer$.offset_70| |v_ULTIMATE.start_sll_circular_prepend_~new_head~1#1.base_15|) 4))) |v_#memory_$Pointer$.offset_70|)) (not (= |v_ULTIMATE.start_sll_circular_prepend_~new_head~1#1.base_15| 0)) (<= (+ |v_ULTIMATE.start_sll_circular_prepend_~new_head~1#1.base_15| 1) |#StackHeapBarrier|)) (and (= |v_ULTIMATE.start_sll_circular_prepend_#in~head#1.base_10| |v_ULTIMATE.start_sll_circular_prepend_~head#1.base_16|) (= |v_ULTIMATE.start_sll_circular_prepend_#in~head#1.base_10| |ULTIMATE.start_main_~#s~0#1.base|) (exists ((|v_#memory_$Pointer$.base_75| (Array Int (Array Int Int))) (|v_#memory_int_87| (Array Int (Array Int Int))) (|v_old(#memory_int)_AFTER_CALL_25| (Array Int (Array Int Int))) (|v_#memory_$Pointer$.offset_69| (Array Int (Array Int Int))) (|v_ULTIMATE.start_sll_circular_create_~last~0#1.base_16| Int)) (and (= 0 (select (select (store |v_#memory_$Pointer$.offset_69| |v_ULTIMATE.start_sll_circular_create_~last~0#1.base_16| (store (select |v_#memory_$Pointer$.offset_69| |v_ULTIMATE.start_sll_circular_create_~last~0#1.base_16|) 0 0)) |ULTIMATE.start_main_~#s~0#1.base|) 0)) (= (select (select (store |v_#memory_$Pointer$.base_75| |v_ULTIMATE.start_sll_circular_create_~last~0#1.base_16| (store (select |v_#memory_$Pointer$.base_75| |v_ULTIMATE.start_sll_circular_create_~last~0#1.base_16|) 0 |ULTIMATE.start_sll_circular_create_#res#1.base|)) |ULTIMATE.start_main_~#s~0#1.base|) 0) |ULTIMATE.start_sll_circular_create_#res#1.base|) (= |v_old(#memory_int)_AFTER_CALL_25| (store |v_#memory_int_87| |v_ULTIMATE.start_sll_circular_create_~last~0#1.base_16| (store (select |v_#memory_int_87| |v_ULTIMATE.start_sll_circular_create_~last~0#1.base_16|) 0 (select (select |v_old(#memory_int)_AFTER_CALL_25| |v_ULTIMATE.start_sll_circular_create_~last~0#1.base_16|) 0)))))) (exists ((|v_#length_28| (Array Int Int))) (= |#length| (store |v_#length_28| |v_ULTIMATE.start_sll_circular_prepend_~new_head~1#1.base_15| 8))) (exists ((|v_#memory_int_84| (Array Int (Array Int Int))) (|v_#memory_int_41| (Array Int (Array Int Int)))) (and (= |v_#memory_int_41| (store |v_#memory_int_84| |v_ULTIMATE.start_sll_circular_prepend_~new_head~1#1.base_15| (store (select |v_#memory_int_84| |v_ULTIMATE.start_sll_circular_prepend_~new_head~1#1.base_15|) 0 (select (select |v_#memory_int_41| |v_ULTIMATE.start_sll_circular_prepend_~new_head~1#1.base_15|) 0)))) (= (store |v_#memory_int_41| |v_ULTIMATE.start_sll_circular_prepend_~new_head~1#1.base_15| (store (select |v_#memory_int_41| |v_ULTIMATE.start_sll_circular_prepend_~new_head~1#1.base_15|) 4 1)) |v_#memory_int_88|))) (exists ((|v_#valid_40| (Array Int Int))) (and (= (store |v_#valid_40| |v_ULTIMATE.start_sll_circular_prepend_~new_head~1#1.base_15| 1) |#valid|) (= (select |v_#valid_40| |v_ULTIMATE.start_sll_circular_prepend_~new_head~1#1.base_15|) 0))) (exists ((|v_#memory_$Pointer$.base_72| (Array Int (Array Int Int)))) (= (store |v_#memory_$Pointer$.base_72| |v_ULTIMATE.start_sll_circular_prepend_~new_head~1#1.base_15| (store (store (select |v_#memory_$Pointer$.base_72| |v_ULTIMATE.start_sll_circular_prepend_~new_head~1#1.base_15|) 0 0) 4 (select (select |v_#memory_$Pointer$.base_76| |v_ULTIMATE.start_sll_circular_prepend_~new_head~1#1.base_15|) 4))) |v_#memory_$Pointer$.base_76|)) (exists ((|v_#memory_$Pointer$.offset_66| (Array Int (Array Int Int)))) (= (store |v_#memory_$Pointer$.offset_66| |v_ULTIMATE.start_sll_circular_prepend_~new_head~1#1.base_15| (store (store (select |v_#memory_$Pointer$.offset_66| |v_ULTIMATE.start_sll_circular_prepend_~new_head~1#1.base_15|) 0 0) 4 (select (select |v_#memory_$Pointer$.offset_70| |v_ULTIMATE.start_sll_circular_prepend_~new_head~1#1.base_15|) 4))) |v_#memory_$Pointer$.offset_70|)) (not (= |v_ULTIMATE.start_sll_circular_prepend_~new_head~1#1.base_15| 0)) (<= (+ |v_ULTIMATE.start_sll_circular_prepend_~new_head~1#1.base_15| 1) |#StackHeapBarrier|))) (= |#memory_$Pointer$.offset| (store (store |v_#memory_$Pointer$.offset_70| |v_ULTIMATE.start_sll_circular_prepend_~head#1.base_16| (store (select |v_#memory_$Pointer$.offset_70| |v_ULTIMATE.start_sll_circular_prepend_~head#1.base_16|) 0 0)) |v_ULTIMATE.start_sll_circular_prepend_~new_head~1#1.base_15| (store (select (store |v_#memory_$Pointer$.offset_70| |v_ULTIMATE.start_sll_circular_prepend_~head#1.base_16| (store (select |v_#memory_$Pointer$.offset_70| |v_ULTIMATE.start_sll_circular_prepend_~head#1.base_16|) 0 0)) |v_ULTIMATE.start_sll_circular_prepend_~new_head~1#1.base_15|) 0 0))))) (= |ULTIMATE.start_sll_circular_create_#res#1.offset| 0) (= (select (select |#memory_$Pointer$.offset| |ULTIMATE.start_main_~#s~0#1.base|) 0) |ULTIMATE.start_main_~ptr~0#1.offset|) (= |ULTIMATE.start_main_~data~0#1| 1) (= |ULTIMATE.start_main_~#s~0#1.offset| 0) (= |ULTIMATE.start_main_~len~0#1| 2) (= (select (select |#memory_$Pointer$.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 21:24:31,701 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-23 21:24:31,702 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-11-23 21:24:31,702 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 17 [2023-11-23 21:24:31,702 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [955593879] [2023-11-23 21:24:31,702 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-11-23 21:24:31,703 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2023-11-23 21:24:31,703 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:24:31,704 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2023-11-23 21:24:31,705 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=959, Unknown=9, NotChecked=62, Total=1122 [2023-11-23 21:24:31,705 INFO L87 Difference]: Start difference. First operand 26 states and 32 transitions. Second operand has 17 states, 12 states have (on average 1.9166666666666667) internal successors, (23), 13 states have internal predecessors, (23), 3 states have call successors, (4), 2 states have call predecessors, (4), 4 states have return successors, (4), 4 states have call predecessors, (4), 3 states have call successors, (4) [2023-11-23 21:24:32,202 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:24:32,202 INFO L93 Difference]: Finished difference Result 34 states and 42 transitions. [2023-11-23 21:24:32,204 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2023-11-23 21:24:32,204 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 12 states have (on average 1.9166666666666667) internal successors, (23), 13 states have internal predecessors, (23), 3 states have call successors, (4), 2 states have call predecessors, (4), 4 states have return successors, (4), 4 states have call predecessors, (4), 3 states have call successors, (4) Word has length 25 [2023-11-23 21:24:32,205 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:24:32,205 INFO L225 Difference]: With dead ends: 34 [2023-11-23 21:24:32,206 INFO L226 Difference]: Without dead ends: 25 [2023-11-23 21:24:32,207 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 75 GetRequests, 38 SyntacticMatches, 1 SemanticMatches, 36 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 306 ImplicationChecksByTransitivity, 21.6s TimeCoverageRelationStatistics Valid=118, Invalid=1209, Unknown=9, NotChecked=70, Total=1406 [2023-11-23 21:24:32,208 INFO L413 NwaCegarLoop]: 15 mSDtfsCounter, 21 mSDsluCounter, 108 mSDsCounter, 0 mSdLazyCounter, 157 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 22 SdHoareTripleChecker+Valid, 123 SdHoareTripleChecker+Invalid, 192 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 157 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 30 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-23 21:24:32,208 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [22 Valid, 123 Invalid, 192 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 157 Invalid, 0 Unknown, 30 Unchecked, 0.2s Time] [2023-11-23 21:24:32,209 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2023-11-23 21:24:32,215 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 23. [2023-11-23 21:24:32,215 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 23 states, 18 states have (on average 1.2222222222222223) internal successors, (22), 18 states have internal predecessors, (22), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-11-23 21:24:32,216 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 23 states to 23 states and 28 transitions. [2023-11-23 21:24:32,216 INFO L78 Accepts]: Start accepts. Automaton has 23 states and 28 transitions. Word has length 25 [2023-11-23 21:24:32,217 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:24:32,217 INFO L495 AbstractCegarLoop]: Abstraction has 23 states and 28 transitions. [2023-11-23 21:24:32,217 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 12 states have (on average 1.9166666666666667) internal successors, (23), 13 states have internal predecessors, (23), 3 states have call successors, (4), 2 states have call predecessors, (4), 4 states have return successors, (4), 4 states have call predecessors, (4), 3 states have call successors, (4) [2023-11-23 21:24:32,217 INFO L276 IsEmpty]: Start isEmpty. Operand 23 states and 28 transitions. [2023-11-23 21:24:32,218 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2023-11-23 21:24:32,218 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:24:32,218 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:24:32,240 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_349e7929-1de9-4532-837d-78c112023b3b/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Ended with exit code 0 [2023-11-23 21:24:32,439 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_349e7929-1de9-4532-837d-78c112023b3b/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:24:32,440 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:24:32,440 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:24:32,440 INFO L85 PathProgramCache]: Analyzing trace with hash 391020969, now seen corresponding path program 1 times [2023-11-23 21:24:32,440 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:24:32,440 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1977776461] [2023-11-23 21:24:32,440 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:24:32,440 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:24:32,518 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:24:34,123 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 5 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 21:24:34,123 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:24:34,123 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1977776461] [2023-11-23 21:24:34,123 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1977776461] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:24:34,124 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [151547809] [2023-11-23 21:24:34,124 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:24:34,124 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:24:34,124 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_349e7929-1de9-4532-837d-78c112023b3b/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:24:34,125 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_349e7929-1de9-4532-837d-78c112023b3b/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:24:34,138 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_349e7929-1de9-4532-837d-78c112023b3b/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-11-23 21:24:34,295 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:24:34,300 INFO L262 TraceCheckSpWp]: Trace formula consists of 333 conjuncts, 100 conjunts are in the unsatisfiable core [2023-11-23 21:24:34,307 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 21:24:34,387 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 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 6 treesize of output 5 [2023-11-23 21:24:34,827 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 19 treesize of output 11 [2023-11-23 21:24:34,833 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 21:24:34,838 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 5 treesize of output 3 [2023-11-23 21:24:34,924 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 13 treesize of output 9 [2023-11-23 21:24:35,040 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-23 21:24:35,041 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 21:24:35,052 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-23 21:24:35,054 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 27 treesize of output 20 [2023-11-23 21:24:35,077 INFO L349 Elim1Store]: treesize reduction 4, result has 66.7 percent of original size [2023-11-23 21:24:35,077 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 15 treesize of output 15 [2023-11-23 21:24:35,848 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 2 new quantified variables, introduced 0 case distinctions, treesize of input 39 treesize of output 41 [2023-11-23 21:24:35,865 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-23 21:24:35,867 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-23 21:24:35,869 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 2 stores, 2 select indices, 2 select index equivalence classes, 3 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 45 treesize of output 55 [2023-11-23 21:24:35,891 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-23 21:24:35,897 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-23 21:24:35,956 INFO L349 Elim1Store]: treesize reduction 44, result has 24.1 percent of original size [2023-11-23 21:24:35,956 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 4 case distinctions, treesize of input 107 treesize of output 87 [2023-11-23 21:24:35,972 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 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 16 treesize of output 15 [2023-11-23 21:24:35,990 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 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 0 case distinctions, treesize of input 147 treesize of output 115 [2023-11-23 21:24:36,000 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-23 21:24:36,003 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-23 21:24:36,005 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 31 treesize of output 21 [2023-11-23 21:24:36,017 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 5 treesize of output 3 [2023-11-23 21:24:36,207 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-23 21:24:36,211 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-23 21:24:36,215 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 51 treesize of output 41 [2023-11-23 21:24:36,222 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 32 treesize of output 20 [2023-11-23 21:24:36,235 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 5 treesize of output 3 [2023-11-23 21:24:36,367 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 7 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-23 21:24:36,367 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-23 21:24:36,574 WARN L854 $PredicateComparison]: unable to prove that (forall ((v_ArrVal_446 (Array Int Int)) (v_ArrVal_449 (Array Int Int)) (v_ArrVal_448 (Array Int Int)) (v_ArrVal_442 Int) (v_ArrVal_451 (Array Int Int)) (v_ArrVal_445 (Array Int Int)) (v_ArrVal_444 (Array Int Int))) (= |c_ULTIMATE.start_main_~data~0#1| (select (select (store (store (store |c_#memory_int| |c_ULTIMATE.start_sll_circular_prepend_~new_head~1#1.base| (store (select |c_#memory_int| |c_ULTIMATE.start_sll_circular_prepend_~new_head~1#1.base|) |c_ULTIMATE.start_sll_circular_prepend_~new_head~1#1.offset| v_ArrVal_442)) |c_ULTIMATE.start_sll_circular_prepend_~head#1.base| v_ArrVal_444) |c_ULTIMATE.start_sll_circular_prepend_~last~1#1.base| v_ArrVal_446) (select (select (store (let ((.cse0 (store |c_#memory_$Pointer$.base| |c_ULTIMATE.start_sll_circular_prepend_~new_head~1#1.base| v_ArrVal_448))) (store .cse0 |c_ULTIMATE.start_sll_circular_prepend_~head#1.base| (store (select .cse0 |c_ULTIMATE.start_sll_circular_prepend_~head#1.base|) |c_ULTIMATE.start_sll_circular_prepend_~head#1.offset| |c_ULTIMATE.start_sll_circular_prepend_~new_head~1#1.base|))) |c_ULTIMATE.start_sll_circular_prepend_~last~1#1.base| v_ArrVal_445) |c_ULTIMATE.start_main_~#s~0#1.base|) |c_ULTIMATE.start_main_~#s~0#1.offset|)) (+ (select (select (store (store (store |c_#memory_$Pointer$.offset| |c_ULTIMATE.start_sll_circular_prepend_~new_head~1#1.base| v_ArrVal_449) |c_ULTIMATE.start_sll_circular_prepend_~head#1.base| (store (select (store |c_#memory_$Pointer$.offset| |c_ULTIMATE.start_sll_circular_prepend_~new_head~1#1.base| (store (select |c_#memory_$Pointer$.offset| |c_ULTIMATE.start_sll_circular_prepend_~new_head~1#1.base|) |c_ULTIMATE.start_sll_circular_prepend_~new_head~1#1.offset| (select (select |c_#memory_$Pointer$.offset| |c_ULTIMATE.start_sll_circular_prepend_~head#1.base|) |c_ULTIMATE.start_sll_circular_prepend_~head#1.offset|))) |c_ULTIMATE.start_sll_circular_prepend_~head#1.base|) |c_ULTIMATE.start_sll_circular_prepend_~head#1.offset| |c_ULTIMATE.start_sll_circular_prepend_~new_head~1#1.offset|)) |c_ULTIMATE.start_sll_circular_prepend_~last~1#1.base| v_ArrVal_451) |c_ULTIMATE.start_main_~#s~0#1.base|) |c_ULTIMATE.start_main_~#s~0#1.offset|) 4)))) is different from false [2023-11-23 21:24:37,525 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-11-23 21:24:37,532 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 1 new quantified variables, introduced 2 case distinctions, treesize of input 101 treesize of output 107 [2023-11-23 21:24:37,571 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-11-23 21:24:37,571 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 446 treesize of output 445 [2023-11-23 21:24:37,593 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 364 treesize of output 280 [2023-11-23 21:24:37,611 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 160 treesize of output 118 [2023-11-23 21:24:38,583 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [151547809] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:24:38,584 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1804571128] [2023-11-23 21:24:38,587 INFO L159 IcfgInterpreter]: Started Sifa with 20 locations of interest [2023-11-23 21:24:38,587 INFO L166 IcfgInterpreter]: Building call graph [2023-11-23 21:24:38,587 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-23 21:24:38,587 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-23 21:24:38,588 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs