./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/list-simple/sll2c_prepend_unequal.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 9bd2c7ff Calling Ultimate with: /usr/lib/jvm/java-1.11.0-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09aba4f6-ede9-4128-8045-e9fb38f3a141/bin/utaipan-verify-t7M7D8N6sZ/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09aba4f6-ede9-4128-8045-e9fb38f3a141/bin/utaipan-verify-t7M7D8N6sZ/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09aba4f6-ede9-4128-8045-e9fb38f3a141/bin/utaipan-verify-t7M7D8N6sZ/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09aba4f6-ede9-4128-8045-e9fb38f3a141/bin/utaipan-verify-t7M7D8N6sZ/config/TaipanReach.xml -i ../../sv-benchmarks/c/list-simple/sll2c_prepend_unequal.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09aba4f6-ede9-4128-8045-e9fb38f3a141/bin/utaipan-verify-t7M7D8N6sZ/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09aba4f6-ede9-4128-8045-e9fb38f3a141/bin/utaipan-verify-t7M7D8N6sZ --witnessprinter.witness.filename witness --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash f2f6ef7968fa573a7da88ae0a516f1d800f437d82b0fa75227e8d7d318952eb1 --- Real Ultimate output --- This is Ultimate 0.2.3-dev-9bd2c7f [2023-11-19 05:22:37,922 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-11-19 05:22:38,019 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09aba4f6-ede9-4128-8045-e9fb38f3a141/bin/utaipan-verify-t7M7D8N6sZ/config/svcomp-Reach-32bit-Taipan_Default.epf [2023-11-19 05:22:38,024 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-11-19 05:22:38,025 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-11-19 05:22:38,077 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-11-19 05:22:38,078 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-11-19 05:22:38,079 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-11-19 05:22:38,080 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-11-19 05:22:38,085 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-11-19 05:22:38,086 INFO L153 SettingsManager]: * User list type=DISABLED [2023-11-19 05:22:38,087 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-11-19 05:22:38,087 INFO L153 SettingsManager]: * Explicit value domain=true [2023-11-19 05:22:38,089 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-11-19 05:22:38,089 INFO L153 SettingsManager]: * Octagon Domain=false [2023-11-19 05:22:38,090 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-11-19 05:22:38,090 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-11-19 05:22:38,091 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-11-19 05:22:38,091 INFO L153 SettingsManager]: * Interval Domain=false [2023-11-19 05:22:38,092 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-11-19 05:22:38,093 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-11-19 05:22:38,093 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2023-11-19 05:22:38,094 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-11-19 05:22:38,095 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-11-19 05:22:38,095 INFO L153 SettingsManager]: * sizeof long=4 [2023-11-19 05:22:38,096 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-11-19 05:22:38,096 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-11-19 05:22:38,097 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-11-19 05:22:38,097 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-11-19 05:22:38,098 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-11-19 05:22:38,099 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-11-19 05:22:38,099 INFO L153 SettingsManager]: * sizeof long double=12 [2023-11-19 05:22:38,100 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2023-11-19 05:22:38,100 INFO L153 SettingsManager]: * Use constant arrays=true [2023-11-19 05:22:38,100 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-11-19 05:22:38,101 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-11-19 05:22:38,101 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-19 05:22:38,101 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-11-19 05:22:38,101 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-11-19 05:22:38,102 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2023-11-19 05:22:38,102 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-11-19 05:22:38,102 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-11-19 05:22:38,103 INFO L153 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-11-19 05:22:38,103 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-11-19 05:22:38,103 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-11-19 05:22:38,104 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_09aba4f6-ede9-4128-8045-e9fb38f3a141/bin/utaipan-verify-t7M7D8N6sZ/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09aba4f6-ede9-4128-8045-e9fb38f3a141/bin/utaipan-verify-t7M7D8N6sZ Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> f2f6ef7968fa573a7da88ae0a516f1d800f437d82b0fa75227e8d7d318952eb1 [2023-11-19 05:22:38,404 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-11-19 05:22:38,428 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-11-19 05:22:38,431 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-11-19 05:22:38,433 INFO L270 PluginConnector]: Initializing CDTParser... [2023-11-19 05:22:38,434 INFO L274 PluginConnector]: CDTParser initialized [2023-11-19 05:22:38,435 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09aba4f6-ede9-4128-8045-e9fb38f3a141/bin/utaipan-verify-t7M7D8N6sZ/../../sv-benchmarks/c/list-simple/sll2c_prepend_unequal.i [2023-11-19 05:22:41,588 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-11-19 05:22:41,941 INFO L384 CDTParser]: Found 1 translation units. [2023-11-19 05:22:41,950 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09aba4f6-ede9-4128-8045-e9fb38f3a141/sv-benchmarks/c/list-simple/sll2c_prepend_unequal.i [2023-11-19 05:22:41,971 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09aba4f6-ede9-4128-8045-e9fb38f3a141/bin/utaipan-verify-t7M7D8N6sZ/data/7198d3dc7/c3d3a3e497f84856b9bb5798fdb2e058/FLAG30479596e [2023-11-19 05:22:41,990 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09aba4f6-ede9-4128-8045-e9fb38f3a141/bin/utaipan-verify-t7M7D8N6sZ/data/7198d3dc7/c3d3a3e497f84856b9bb5798fdb2e058 [2023-11-19 05:22:42,000 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-11-19 05:22:42,002 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-11-19 05:22:42,008 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-11-19 05:22:42,008 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-11-19 05:22:42,015 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-11-19 05:22:42,016 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.11 05:22:41" (1/1) ... [2023-11-19 05:22:42,017 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@675d399f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:22:42, skipping insertion in model container [2023-11-19 05:22:42,017 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.11 05:22:41" (1/1) ... [2023-11-19 05:22:42,068 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-11-19 05:22:42,427 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_09aba4f6-ede9-4128-8045-e9fb38f3a141/sv-benchmarks/c/list-simple/sll2c_prepend_unequal.i[24547,24560] [2023-11-19 05:22:42,437 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-19 05:22:42,449 INFO L202 MainTranslator]: Completed pre-run [2023-11-19 05:22:42,530 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_09aba4f6-ede9-4128-8045-e9fb38f3a141/sv-benchmarks/c/list-simple/sll2c_prepend_unequal.i[24547,24560] [2023-11-19 05:22:42,531 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-19 05:22:42,574 INFO L206 MainTranslator]: Completed translation [2023-11-19 05:22:42,574 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:22:42 WrapperNode [2023-11-19 05:22:42,574 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-11-19 05:22:42,576 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-11-19 05:22:42,576 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-11-19 05:22:42,576 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-11-19 05:22:42,583 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:22:42" (1/1) ... [2023-11-19 05:22:42,610 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:22:42" (1/1) ... [2023-11-19 05:22:42,640 INFO L138 Inliner]: procedures = 127, calls = 45, calls flagged for inlining = 6, calls inlined = 6, statements flattened = 149 [2023-11-19 05:22:42,640 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-11-19 05:22:42,641 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-11-19 05:22:42,641 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-11-19 05:22:42,641 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-11-19 05:22:42,652 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:22:42" (1/1) ... [2023-11-19 05:22:42,653 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:22:42" (1/1) ... [2023-11-19 05:22:42,657 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:22:42" (1/1) ... [2023-11-19 05:22:42,658 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:22:42" (1/1) ... [2023-11-19 05:22:42,671 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:22:42" (1/1) ... [2023-11-19 05:22:42,676 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:22:42" (1/1) ... [2023-11-19 05:22:42,678 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:22:42" (1/1) ... [2023-11-19 05:22:42,680 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:22:42" (1/1) ... [2023-11-19 05:22:42,685 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-11-19 05:22:42,686 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-11-19 05:22:42,686 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-11-19 05:22:42,687 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-11-19 05:22:42,688 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:22:42" (1/1) ... [2023-11-19 05:22:42,706 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-19 05:22:42,719 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09aba4f6-ede9-4128-8045-e9fb38f3a141/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 05:22:42,733 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09aba4f6-ede9-4128-8045-e9fb38f3a141/bin/utaipan-verify-t7M7D8N6sZ/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-11-19 05:22:42,756 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09aba4f6-ede9-4128-8045-e9fb38f3a141/bin/utaipan-verify-t7M7D8N6sZ/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-11-19 05:22:42,792 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-11-19 05:22:42,793 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-11-19 05:22:42,793 INFO L130 BoogieDeclarations]: Found specification of procedure node_create [2023-11-19 05:22:42,793 INFO L138 BoogieDeclarations]: Found implementation of procedure node_create [2023-11-19 05:22:42,794 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2023-11-19 05:22:42,794 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-11-19 05:22:42,796 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2023-11-19 05:22:42,796 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2023-11-19 05:22:42,797 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2023-11-19 05:22:42,797 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-11-19 05:22:42,798 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~$Pointer$ [2023-11-19 05:22:42,798 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-11-19 05:22:42,798 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-11-19 05:22:42,798 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-11-19 05:22:42,955 INFO L236 CfgBuilder]: Building ICFG [2023-11-19 05:22:42,958 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2023-11-19 05:22:43,266 INFO L277 CfgBuilder]: Performing block encoding [2023-11-19 05:22:43,343 INFO L297 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-11-19 05:22:43,343 INFO L302 CfgBuilder]: Removed 4 assume(true) statements. [2023-11-19 05:22:43,357 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.11 05:22:43 BoogieIcfgContainer [2023-11-19 05:22:43,357 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-11-19 05:22:43,360 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-11-19 05:22:43,360 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-11-19 05:22:43,363 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-11-19 05:22:43,365 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 19.11 05:22:41" (1/3) ... [2023-11-19 05:22:43,366 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3f33d178 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.11 05:22:43, skipping insertion in model container [2023-11-19 05:22:43,366 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:22:42" (2/3) ... [2023-11-19 05:22:43,368 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3f33d178 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.11 05:22:43, skipping insertion in model container [2023-11-19 05:22:43,369 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.11 05:22:43" (3/3) ... [2023-11-19 05:22:43,370 INFO L112 eAbstractionObserver]: Analyzing ICFG sll2c_prepend_unequal.i [2023-11-19 05:22:43,390 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-11-19 05:22:43,390 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-11-19 05:22:43,445 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-11-19 05:22:43,452 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;@4ba7bb45, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-11-19 05:22:43,452 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-11-19 05:22:43,457 INFO L276 IsEmpty]: Start isEmpty. Operand has 29 states, 23 states have (on average 1.565217391304348) internal successors, (36), 24 states have internal predecessors, (36), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-11-19 05:22:43,466 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2023-11-19 05:22:43,466 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:22:43,467 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 05:22:43,468 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 05:22:43,474 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:22:43,474 INFO L85 PathProgramCache]: Analyzing trace with hash -1759233044, now seen corresponding path program 1 times [2023-11-19 05:22:43,485 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:22:43,486 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1011531798] [2023-11-19 05:22:43,486 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:22:43,486 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:22:43,662 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:22:44,023 INFO L134 CoverageAnalysis]: Checked inductivity of 3 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-11-19 05:22:44,023 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:22:44,024 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1011531798] [2023-11-19 05:22:44,024 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1011531798] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-19 05:22:44,025 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-19 05:22:44,025 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-11-19 05:22:44,027 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [507133025] [2023-11-19 05:22:44,028 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 05:22:44,033 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-19 05:22:44,033 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:22:44,067 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-19 05:22:44,068 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-19 05:22:44,070 INFO L87 Difference]: Start difference. First operand has 29 states, 23 states have (on average 1.565217391304348) internal successors, (36), 24 states have internal predecessors, (36), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Second operand has 3 states, 3 states have (on average 3.3333333333333335) internal successors, (10), 3 states have internal predecessors, (10), 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) [2023-11-19 05:22:44,146 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:22:44,147 INFO L93 Difference]: Finished difference Result 55 states and 80 transitions. [2023-11-19 05:22:44,150 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-19 05:22:44,152 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 3.3333333333333335) internal successors, (10), 3 states have internal predecessors, (10), 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 16 [2023-11-19 05:22:44,153 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:22:44,162 INFO L225 Difference]: With dead ends: 55 [2023-11-19 05:22:44,162 INFO L226 Difference]: Without dead ends: 26 [2023-11-19 05:22:44,167 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-19 05:22:44,175 INFO L413 NwaCegarLoop]: 31 mSDtfsCounter, 1 mSDsluCounter, 29 mSDsCounter, 0 mSdLazyCounter, 15 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 60 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 [2023-11-19 05:22:44,177 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [2 Valid, 60 Invalid, 15 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 15 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-19 05:22:44,199 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2023-11-19 05:22:44,226 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 24. [2023-11-19 05:22:44,228 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 19 states have (on average 1.3157894736842106) internal successors, (25), 19 states have internal predecessors, (25), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-11-19 05:22:44,230 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 31 transitions. [2023-11-19 05:22:44,231 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 31 transitions. Word has length 16 [2023-11-19 05:22:44,232 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:22:44,233 INFO L495 AbstractCegarLoop]: Abstraction has 24 states and 31 transitions. [2023-11-19 05:22:44,234 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 3.3333333333333335) internal successors, (10), 3 states have internal predecessors, (10), 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) [2023-11-19 05:22:44,234 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 31 transitions. [2023-11-19 05:22:44,236 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2023-11-19 05:22:44,237 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:22:44,237 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 05:22:44,237 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-11-19 05:22:44,238 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 05:22:44,239 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:22:44,240 INFO L85 PathProgramCache]: Analyzing trace with hash 1317636448, now seen corresponding path program 1 times [2023-11-19 05:22:44,240 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:22:44,240 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1656706573] [2023-11-19 05:22:44,241 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:22:44,242 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:22:44,365 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:22:45,149 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 7 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-19 05:22:45,149 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:22:45,169 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1656706573] [2023-11-19 05:22:45,170 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1656706573] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 05:22:45,170 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1261023231] [2023-11-19 05:22:45,170 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:22:45,170 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:22:45,171 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09aba4f6-ede9-4128-8045-e9fb38f3a141/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 05:22:45,176 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09aba4f6-ede9-4128-8045-e9fb38f3a141/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 05:22:45,200 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09aba4f6-ede9-4128-8045-e9fb38f3a141/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-11-19 05:22:45,355 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:22:45,359 INFO L262 TraceCheckSpWp]: Trace formula consists of 310 conjuncts, 28 conjunts are in the unsatisfiable core [2023-11-19 05:22:45,366 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 05:22:45,508 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 [2023-11-19 05:22:45,536 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 [2023-11-19 05:22:45,563 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-19 05:22:45,567 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 [2023-11-19 05:22:45,593 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 [2023-11-19 05:22:45,610 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 7 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 1 not checked. [2023-11-19 05:22:45,610 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-19 05:22:45,712 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1261023231] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 05:22:45,713 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1059187676] [2023-11-19 05:22:45,744 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-11-19 05:22:45,745 INFO L166 IcfgInterpreter]: Building call graph [2023-11-19 05:22:45,750 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-19 05:22:45,758 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-19 05:22:45,759 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-19 05:22:47,937 INFO L197 IcfgInterpreter]: Interpreting procedure node_create with input of size 8 for LOIs [2023-11-19 05:22:47,950 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-19 05:22:56,654 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSifa [1059187676] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-19 05:22:56,654 INFO L185 FreeRefinementEngine]: Found 1 perfect and 2 imperfect interpolant sequences. [2023-11-19 05:22:56,655 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [14] imperfect sequences [13, 13] total 30 [2023-11-19 05:22:56,656 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1857559962] [2023-11-19 05:22:56,656 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 05:22:56,657 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2023-11-19 05:22:56,657 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:22:56,658 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2023-11-19 05:22:56,660 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=86, Invalid=782, Unknown=6, NotChecked=56, Total=930 [2023-11-19 05:22:56,660 INFO L87 Difference]: Start difference. First operand 24 states and 31 transitions. Second operand has 15 states, 11 states have (on average 1.0909090909090908) internal successors, (12), 10 states have internal predecessors, (12), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-11-19 05:22:59,355 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] [2023-11-19 05:23:01,955 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:23:01,955 INFO L93 Difference]: Finished difference Result 28 states and 35 transitions. [2023-11-19 05:23:01,956 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2023-11-19 05:23:01,956 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 11 states have (on average 1.0909090909090908) internal successors, (12), 10 states have internal predecessors, (12), 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 22 [2023-11-19 05:23:01,957 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:23:01,958 INFO L225 Difference]: With dead ends: 28 [2023-11-19 05:23:01,958 INFO L226 Difference]: Without dead ends: 26 [2023-11-19 05:23:01,959 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 62 GetRequests, 32 SyntacticMatches, 1 SemanticMatches, 29 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 223 ImplicationChecksByTransitivity, 9.0s TimeCoverageRelationStatistics Valid=86, Invalid=782, Unknown=6, NotChecked=56, Total=930 [2023-11-19 05:23:01,961 INFO L413 NwaCegarLoop]: 14 mSDtfsCounter, 0 mSDsluCounter, 62 mSDsCounter, 0 mSdLazyCounter, 270 mSolverCounterSat, 1 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 76 SdHoareTripleChecker+Invalid, 273 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 270 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 5.3s IncrementalHoareTripleChecker+Time [2023-11-19 05:23:01,962 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 76 Invalid, 273 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 270 Invalid, 2 Unknown, 0 Unchecked, 5.3s Time] [2023-11-19 05:23:01,963 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2023-11-19 05:23:01,969 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2023-11-19 05:23:01,970 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 21 states have (on average 1.2857142857142858) internal successors, (27), 21 states have internal predecessors, (27), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-11-19 05:23:01,971 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 33 transitions. [2023-11-19 05:23:01,971 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 33 transitions. Word has length 22 [2023-11-19 05:23:01,972 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:23:01,972 INFO L495 AbstractCegarLoop]: Abstraction has 26 states and 33 transitions. [2023-11-19 05:23:01,972 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 11 states have (on average 1.0909090909090908) internal successors, (12), 10 states have internal predecessors, (12), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-11-19 05:23:01,973 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 33 transitions. [2023-11-19 05:23:01,974 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2023-11-19 05:23:01,974 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:23:01,974 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] [2023-11-19 05:23:01,991 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09aba4f6-ede9-4128-8045-e9fb38f3a141/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-11-19 05:23:02,180 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09aba4f6-ede9-4128-8045-e9fb38f3a141/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:23:02,181 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 05:23:02,182 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:23:02,182 INFO L85 PathProgramCache]: Analyzing trace with hash -766704741, now seen corresponding path program 1 times [2023-11-19 05:23:02,182 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:23:02,182 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1152742011] [2023-11-19 05:23:02,182 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:23:02,183 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:23:02,229 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:23:02,714 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 7 proven. 2 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-19 05:23:02,714 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:23:02,715 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1152742011] [2023-11-19 05:23:02,715 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1152742011] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 05:23:02,715 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [842305290] [2023-11-19 05:23:02,715 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:23:02,715 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:23:02,716 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09aba4f6-ede9-4128-8045-e9fb38f3a141/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 05:23:02,721 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09aba4f6-ede9-4128-8045-e9fb38f3a141/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 05:23:02,744 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09aba4f6-ede9-4128-8045-e9fb38f3a141/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-11-19 05:23:02,902 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:23:02,905 INFO L262 TraceCheckSpWp]: Trace formula consists of 320 conjuncts, 28 conjunts are in the unsatisfiable core [2023-11-19 05:23:02,910 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 05:23:02,981 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 [2023-11-19 05:23:02,997 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 [2023-11-19 05:23:03,008 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-19 05:23:03,009 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 [2023-11-19 05:23:03,034 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 [2023-11-19 05:23:03,053 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 7 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 1 not checked. [2023-11-19 05:23:03,053 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-19 05:23:03,135 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [842305290] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 05:23:03,135 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [327879769] [2023-11-19 05:23:03,138 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2023-11-19 05:23:03,138 INFO L166 IcfgInterpreter]: Building call graph [2023-11-19 05:23:03,138 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-19 05:23:03,139 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-19 05:23:03,139 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-19 05:23:04,676 INFO L197 IcfgInterpreter]: Interpreting procedure node_create with input of size 8 for LOIs [2023-11-19 05:23:04,688 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-19 05:23:32,044 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '430#(and (<= 1 |#StackHeapBarrier|) (= |ULTIMATE.start_main_~count~0#1| 1) (= (select (select |#memory_$Pointer$.offset| (select (select |#memory_$Pointer$.base| |ULTIMATE.start_main_~#s~0#1.base|) 0)) (select (select |#memory_$Pointer$.offset| |ULTIMATE.start_main_~#s~0#1.base|) 0)) |ULTIMATE.start_main_~ptr~0#1.offset|) (= |ULTIMATE.start_sll_circular_create_#res#1.offset| 0) (= |ULTIMATE.start_main_~uneq~0#1| 5) (exists ((|v_ULTIMATE.start_sll_circular_prepend_~new_head~1#1.base_15| Int) (|v_#memory_$Pointer$.base_77| (Array Int (Array Int Int))) (|v_#memory_int_89| (Array Int (Array Int Int))) (|v_#memory_int_15| (Array Int (Array Int Int))) (|v_ULTIMATE.start_sll_circular_prepend_#in~head#1.base_10| Int) (|v_ULTIMATE.start_sll_circular_prepend_~head#1.base_16| Int) (|v_#memory_$Pointer$.offset_71| (Array Int (Array Int Int)))) (and (= |#memory_$Pointer$.offset| (store (store |v_#memory_$Pointer$.offset_71| |v_ULTIMATE.start_sll_circular_prepend_~head#1.base_16| (store (select |v_#memory_$Pointer$.offset_71| |v_ULTIMATE.start_sll_circular_prepend_~head#1.base_16|) 0 0)) |v_ULTIMATE.start_sll_circular_prepend_~new_head~1#1.base_15| (store (select (store |v_#memory_$Pointer$.offset_71| |v_ULTIMATE.start_sll_circular_prepend_~head#1.base_16| (store (select |v_#memory_$Pointer$.offset_71| |v_ULTIMATE.start_sll_circular_prepend_~head#1.base_16|) 0 0)) |v_ULTIMATE.start_sll_circular_prepend_~new_head~1#1.base_15|) 0 0))) (= (select (select |v_#memory_$Pointer$.base_77| |v_ULTIMATE.start_sll_circular_prepend_~head#1.base_16|) 0) 0) (= |v_#memory_int_15| (store |v_#memory_int_89| |v_ULTIMATE.start_sll_circular_prepend_~head#1.base_16| (store (select |v_#memory_int_89| |v_ULTIMATE.start_sll_circular_prepend_~head#1.base_16|) 0 (select (select |v_#memory_int_15| |v_ULTIMATE.start_sll_circular_prepend_~head#1.base_16|) 0)))) (= (store |v_#memory_int_15| |v_ULTIMATE.start_sll_circular_prepend_~new_head~1#1.base_15| (store (select |v_#memory_int_15| |v_ULTIMATE.start_sll_circular_prepend_~new_head~1#1.base_15|) 0 (select (select |#memory_int| |v_ULTIMATE.start_sll_circular_prepend_~new_head~1#1.base_15|) 0))) |#memory_int|) (= (store (store |v_#memory_$Pointer$.base_77| |v_ULTIMATE.start_sll_circular_prepend_~head#1.base_16| (store (select |v_#memory_$Pointer$.base_77| |v_ULTIMATE.start_sll_circular_prepend_~head#1.base_16|) 0 |v_ULTIMATE.start_sll_circular_prepend_~new_head~1#1.base_15|)) |v_ULTIMATE.start_sll_circular_prepend_~new_head~1#1.base_15| (store (select (store |v_#memory_$Pointer$.base_77| |v_ULTIMATE.start_sll_circular_prepend_~head#1.base_16| (store (select |v_#memory_$Pointer$.base_77| |v_ULTIMATE.start_sll_circular_prepend_~head#1.base_16|) 0 |v_ULTIMATE.start_sll_circular_prepend_~new_head~1#1.base_15|)) |v_ULTIMATE.start_sll_circular_prepend_~new_head~1#1.base_15|) 0 |v_ULTIMATE.start_sll_circular_prepend_~new_head~1#1.base_15|)) |#memory_$Pointer$.base|) (= (select (select |v_#memory_$Pointer$.offset_71| |v_ULTIMATE.start_sll_circular_prepend_~head#1.base_16|) 0) 0) (or (and (= |v_ULTIMATE.start_sll_circular_prepend_#in~head#1.base_10| |v_ULTIMATE.start_sll_circular_prepend_~head#1.base_16|) (exists ((|v_#memory_$Pointer$.offset_67| (Array Int (Array Int Int)))) (= (store |v_#memory_$Pointer$.offset_67| |v_ULTIMATE.start_sll_circular_prepend_~new_head~1#1.base_15| (store (store (select |v_#memory_$Pointer$.offset_67| |v_ULTIMATE.start_sll_circular_prepend_~new_head~1#1.base_15|) 0 0) 4 (select (select |v_#memory_$Pointer$.offset_71| |v_ULTIMATE.start_sll_circular_prepend_~new_head~1#1.base_15|) 4))) |v_#memory_$Pointer$.offset_71|)) (= |v_ULTIMATE.start_sll_circular_prepend_#in~head#1.base_10| |ULTIMATE.start_main_~#s~0#1.base|) (exists ((|v_#length_28| (Array Int Int))) (= |#length| (store |v_#length_28| |v_ULTIMATE.start_sll_circular_prepend_~new_head~1#1.base_15| 8))) (exists ((|v_#memory_int_40| (Array Int (Array Int Int))) (|v_#memory_int_85| (Array Int (Array Int Int)))) (and (= (store |v_#memory_int_85| |v_ULTIMATE.start_sll_circular_prepend_~new_head~1#1.base_15| (store (select |v_#memory_int_85| |v_ULTIMATE.start_sll_circular_prepend_~new_head~1#1.base_15|) 0 (select (select |v_#memory_int_40| |v_ULTIMATE.start_sll_circular_prepend_~new_head~1#1.base_15|) 0))) |v_#memory_int_40|) (= (store |v_#memory_int_40| |v_ULTIMATE.start_sll_circular_prepend_~new_head~1#1.base_15| (store (select |v_#memory_int_40| |v_ULTIMATE.start_sll_circular_prepend_~new_head~1#1.base_15|) 4 5)) |v_#memory_int_89|))) (exists ((|v_old(#memory_int)_AFTER_CALL_26| (Array Int (Array Int Int))) (|v_#memory_$Pointer$.base_76| (Array Int (Array Int Int))) (|v_#memory_int_88| (Array Int (Array Int Int))) (|v_ULTIMATE.start_sll_circular_create_~last~0#1.base_16| Int) (|v_#memory_$Pointer$.offset_70| (Array Int (Array Int Int)))) (and (= |v_old(#memory_int)_AFTER_CALL_26| (store |v_#memory_int_88| |v_ULTIMATE.start_sll_circular_create_~last~0#1.base_16| (store (select |v_#memory_int_88| |v_ULTIMATE.start_sll_circular_create_~last~0#1.base_16|) 0 (select (select |v_old(#memory_int)_AFTER_CALL_26| |v_ULTIMATE.start_sll_circular_create_~last~0#1.base_16|) 0)))) (= (select (select (store |v_#memory_$Pointer$.base_76| |v_ULTIMATE.start_sll_circular_create_~last~0#1.base_16| (store (select |v_#memory_$Pointer$.base_76| |v_ULTIMATE.start_sll_circular_create_~last~0#1.base_16|) 0 |ULTIMATE.start_sll_circular_create_#res#1.base|)) |ULTIMATE.start_main_~#s~0#1.base|) 0) |ULTIMATE.start_sll_circular_create_#res#1.base|) (= (select (select (store |v_#memory_$Pointer$.offset_70| |v_ULTIMATE.start_sll_circular_create_~last~0#1.base_16| (store (select |v_#memory_$Pointer$.offset_70| |v_ULTIMATE.start_sll_circular_create_~last~0#1.base_16|) 0 0)) |ULTIMATE.start_main_~#s~0#1.base|) 0) 0))) (exists ((|v_#valid_40| (Array Int Int))) (and (= (store |v_#valid_40| |v_ULTIMATE.start_sll_circular_prepend_~new_head~1#1.base_15| 1) |#valid|) (= (select |v_#valid_40| |v_ULTIMATE.start_sll_circular_prepend_~new_head~1#1.base_15|) 0))) (not (= |v_ULTIMATE.start_sll_circular_prepend_~new_head~1#1.base_15| 0)) (<= (+ |v_ULTIMATE.start_sll_circular_prepend_~new_head~1#1.base_15| 1) |#StackHeapBarrier|) (exists ((|v_#memory_$Pointer$.base_73| (Array Int (Array Int Int)))) (= (store |v_#memory_$Pointer$.base_73| |v_ULTIMATE.start_sll_circular_prepend_~new_head~1#1.base_15| (store (store (select |v_#memory_$Pointer$.base_73| |v_ULTIMATE.start_sll_circular_prepend_~new_head~1#1.base_15|) 0 0) 4 (select (select |v_#memory_$Pointer$.base_77| |v_ULTIMATE.start_sll_circular_prepend_~new_head~1#1.base_15|) 4))) |v_#memory_$Pointer$.base_77|))) (and (= |v_ULTIMATE.start_sll_circular_prepend_#in~head#1.base_10| |v_ULTIMATE.start_sll_circular_prepend_~head#1.base_16|) (exists ((|v_#memory_$Pointer$.base_76| (Array Int (Array Int Int))) (|v_old(#memory_int)_AFTER_CALL_25| (Array Int (Array Int Int))) (|v_#memory_int_88| (Array Int (Array Int Int))) (|v_ULTIMATE.start_sll_circular_create_~last~0#1.base_16| Int) (|v_#memory_$Pointer$.offset_70| (Array Int (Array Int Int)))) (and (= (select (select (store |v_#memory_$Pointer$.base_76| |v_ULTIMATE.start_sll_circular_create_~last~0#1.base_16| (store (select |v_#memory_$Pointer$.base_76| |v_ULTIMATE.start_sll_circular_create_~last~0#1.base_16|) 0 |ULTIMATE.start_sll_circular_create_#res#1.base|)) |ULTIMATE.start_main_~#s~0#1.base|) 0) |ULTIMATE.start_sll_circular_create_#res#1.base|) (= (select (select (store |v_#memory_$Pointer$.offset_70| |v_ULTIMATE.start_sll_circular_create_~last~0#1.base_16| (store (select |v_#memory_$Pointer$.offset_70| |v_ULTIMATE.start_sll_circular_create_~last~0#1.base_16|) 0 0)) |ULTIMATE.start_main_~#s~0#1.base|) 0) 0) (= |v_old(#memory_int)_AFTER_CALL_25| (store |v_#memory_int_88| |v_ULTIMATE.start_sll_circular_create_~last~0#1.base_16| (store (select |v_#memory_int_88| |v_ULTIMATE.start_sll_circular_create_~last~0#1.base_16|) 0 (select (select |v_old(#memory_int)_AFTER_CALL_25| |v_ULTIMATE.start_sll_circular_create_~last~0#1.base_16|) 0)))))) (exists ((|v_#memory_$Pointer$.offset_67| (Array Int (Array Int Int)))) (= (store |v_#memory_$Pointer$.offset_67| |v_ULTIMATE.start_sll_circular_prepend_~new_head~1#1.base_15| (store (store (select |v_#memory_$Pointer$.offset_67| |v_ULTIMATE.start_sll_circular_prepend_~new_head~1#1.base_15|) 0 0) 4 (select (select |v_#memory_$Pointer$.offset_71| |v_ULTIMATE.start_sll_circular_prepend_~new_head~1#1.base_15|) 4))) |v_#memory_$Pointer$.offset_71|)) (= |v_ULTIMATE.start_sll_circular_prepend_#in~head#1.base_10| |ULTIMATE.start_main_~#s~0#1.base|) (exists ((|v_#length_28| (Array Int Int))) (= |#length| (store |v_#length_28| |v_ULTIMATE.start_sll_circular_prepend_~new_head~1#1.base_15| 8))) (exists ((|v_#memory_int_40| (Array Int (Array Int Int))) (|v_#memory_int_85| (Array Int (Array Int Int)))) (and (= (store |v_#memory_int_85| |v_ULTIMATE.start_sll_circular_prepend_~new_head~1#1.base_15| (store (select |v_#memory_int_85| |v_ULTIMATE.start_sll_circular_prepend_~new_head~1#1.base_15|) 0 (select (select |v_#memory_int_40| |v_ULTIMATE.start_sll_circular_prepend_~new_head~1#1.base_15|) 0))) |v_#memory_int_40|) (= (store |v_#memory_int_40| |v_ULTIMATE.start_sll_circular_prepend_~new_head~1#1.base_15| (store (select |v_#memory_int_40| |v_ULTIMATE.start_sll_circular_prepend_~new_head~1#1.base_15|) 4 5)) |v_#memory_int_89|))) (exists ((|v_#valid_40| (Array Int Int))) (and (= (store |v_#valid_40| |v_ULTIMATE.start_sll_circular_prepend_~new_head~1#1.base_15| 1) |#valid|) (= (select |v_#valid_40| |v_ULTIMATE.start_sll_circular_prepend_~new_head~1#1.base_15|) 0))) (not (= |v_ULTIMATE.start_sll_circular_prepend_~new_head~1#1.base_15| 0)) (<= (+ |v_ULTIMATE.start_sll_circular_prepend_~new_head~1#1.base_15| 1) |#StackHeapBarrier|) (exists ((|v_#memory_$Pointer$.base_73| (Array Int (Array Int Int)))) (= (store |v_#memory_$Pointer$.base_73| |v_ULTIMATE.start_sll_circular_prepend_~new_head~1#1.base_15| (store (store (select |v_#memory_$Pointer$.base_73| |v_ULTIMATE.start_sll_circular_prepend_~new_head~1#1.base_15|) 0 0) 4 (select (select |v_#memory_$Pointer$.base_77| |v_ULTIMATE.start_sll_circular_prepend_~new_head~1#1.base_15|) 4))) |v_#memory_$Pointer$.base_77|)))))) (= |ULTIMATE.start_main_~data~0#1| 1) (= |ULTIMATE.start_main_~ptr~0#1.base| (select (select |#memory_$Pointer$.base| (select (select |#memory_$Pointer$.base| |ULTIMATE.start_main_~#s~0#1.base|) 0)) (select (select |#memory_$Pointer$.offset| |ULTIMATE.start_main_~#s~0#1.base|) 0))) (= |ULTIMATE.start_main_~#s~0#1.offset| 0) (= |ULTIMATE.start_main_~len~0#1| 2) (<= 2 |ULTIMATE.start_main_~#s~0#1.base|))' at error location [2023-11-19 05:23:32,044 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-19 05:23:32,045 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-11-19 05:23:32,045 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [13, 13] total 17 [2023-11-19 05:23:32,045 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1865031916] [2023-11-19 05:23:32,045 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-11-19 05:23:32,046 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2023-11-19 05:23:32,046 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:23:32,047 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2023-11-19 05:23:32,048 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=92, Invalid=958, Unknown=10, NotChecked=62, Total=1122 [2023-11-19 05:23:32,049 INFO L87 Difference]: Start difference. First operand 26 states and 33 transitions. Second operand has 17 states, 12 states have (on average 1.8333333333333333) internal successors, (22), 13 states have internal predecessors, (22), 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) [2023-11-19 05:23:32,675 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:23:32,675 INFO L93 Difference]: Finished difference Result 34 states and 43 transitions. [2023-11-19 05:23:32,676 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2023-11-19 05:23:32,676 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 12 states have (on average 1.8333333333333333) internal successors, (22), 13 states have internal predecessors, (22), 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 24 [2023-11-19 05:23:32,676 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:23:32,677 INFO L225 Difference]: With dead ends: 34 [2023-11-19 05:23:32,678 INFO L226 Difference]: Without dead ends: 26 [2023-11-19 05:23:32,679 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 72 GetRequests, 35 SyntacticMatches, 1 SemanticMatches, 36 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 306 ImplicationChecksByTransitivity, 27.9s TimeCoverageRelationStatistics Valid=118, Invalid=1208, Unknown=10, NotChecked=70, Total=1406 [2023-11-19 05:23:32,680 INFO L413 NwaCegarLoop]: 17 mSDtfsCounter, 18 mSDsluCounter, 135 mSDsCounter, 0 mSdLazyCounter, 180 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 19 SdHoareTripleChecker+Valid, 152 SdHoareTripleChecker+Invalid, 217 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 180 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 32 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-11-19 05:23:32,681 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [19 Valid, 152 Invalid, 217 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 180 Invalid, 0 Unknown, 32 Unchecked, 0.3s Time] [2023-11-19 05:23:32,682 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2023-11-19 05:23:32,688 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 24. [2023-11-19 05:23:32,689 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 19 states have (on average 1.263157894736842) internal successors, (24), 19 states have internal predecessors, (24), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-11-19 05:23:32,689 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 30 transitions. [2023-11-19 05:23:32,690 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 30 transitions. Word has length 24 [2023-11-19 05:23:32,690 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:23:32,690 INFO L495 AbstractCegarLoop]: Abstraction has 24 states and 30 transitions. [2023-11-19 05:23:32,691 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 12 states have (on average 1.8333333333333333) internal successors, (22), 13 states have internal predecessors, (22), 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) [2023-11-19 05:23:32,691 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 30 transitions. [2023-11-19 05:23:32,692 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2023-11-19 05:23:32,692 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:23:32,692 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] [2023-11-19 05:23:32,721 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09aba4f6-ede9-4128-8045-e9fb38f3a141/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2023-11-19 05:23:32,904 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09aba4f6-ede9-4128-8045-e9fb38f3a141/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:23:32,905 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 05:23:32,905 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:23:32,905 INFO L85 PathProgramCache]: Analyzing trace with hash -845270189, now seen corresponding path program 1 times [2023-11-19 05:23:32,905 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:23:32,906 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [126729043] [2023-11-19 05:23:32,906 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:23:32,906 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:23:32,981 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:23:34,500 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 5 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 05:23:34,501 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:23:34,501 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [126729043] [2023-11-19 05:23:34,501 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [126729043] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 05:23:34,501 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [914371508] [2023-11-19 05:23:34,501 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:23:34,502 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:23:34,502 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09aba4f6-ede9-4128-8045-e9fb38f3a141/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 05:23:34,503 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09aba4f6-ede9-4128-8045-e9fb38f3a141/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 05:23:34,514 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_09aba4f6-ede9-4128-8045-e9fb38f3a141/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-11-19 05:23:34,681 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:23:34,685 INFO L262 TraceCheckSpWp]: Trace formula consists of 333 conjuncts, 79 conjunts are in the unsatisfiable core [2023-11-19 05:23:34,691 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 05:23:34,700 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 [2023-11-19 05:23:34,880 INFO L349 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2023-11-19 05:23:34,880 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 17 treesize of output 21 [2023-11-19 05:23:34,971 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2023-11-19 05:23:35,075 INFO L349 Elim1Store]: treesize reduction 31, result has 22.5 percent of original size [2023-11-19 05:23:35,076 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 2 new quantified variables, introduced 1 case distinctions, treesize of input 54 treesize of output 41 [2023-11-19 05:23:35,176 INFO L349 Elim1Store]: treesize reduction 3, result has 75.0 percent of original size [2023-11-19 05:23:35,176 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 39 treesize of output 27 [2023-11-19 05:23:35,185 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 [2023-11-19 05:23:35,192 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 1 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2023-11-19 05:23:35,230 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$.offset| (store |c_old(#memory_$Pointer$.offset)| |node_create_~temp~0#1.base| (select |c_#memory_$Pointer$.offset| |node_create_~temp~0#1.base|))) (= |c_#memory_$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|))) (= 0 (select |c_old(#valid)| |node_create_~temp~0#1.base|)))) is different from true [2023-11-19 05:23:35,246 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-19 05:23:35,261 INFO L349 Elim1Store]: treesize reduction 25, result has 16.7 percent of original size [2023-11-19 05:23:35,261 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 2 case distinctions, treesize of input 47 treesize of output 38 [2023-11-19 05:23:35,289 INFO L349 Elim1Store]: treesize reduction 8, result has 72.4 percent of original size [2023-11-19 05:23:35,290 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 28 treesize of output 30 [2023-11-19 05:23:35,296 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-19 05:23:35,297 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 16 treesize of output 11 [2023-11-19 05:23:35,359 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 [2023-11-19 05:23:35,431 INFO L349 Elim1Store]: treesize reduction 3, result has 75.0 percent of original size [2023-11-19 05:23:35,432 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 35 treesize of output 23 [2023-11-19 05:23:35,465 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 5 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 2 not checked. [2023-11-19 05:23:35,465 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-19 05:23:35,769 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [914371508] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 05:23:35,770 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [943227295] [2023-11-19 05:23:35,773 INFO L159 IcfgInterpreter]: Started Sifa with 19 locations of interest [2023-11-19 05:23:35,773 INFO L166 IcfgInterpreter]: Building call graph [2023-11-19 05:23:35,774 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-19 05:23:35,774 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-19 05:23:35,774 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-19 05:23:37,484 INFO L197 IcfgInterpreter]: Interpreting procedure node_create with input of size 8 for LOIs [2023-11-19 05:23:37,493 INFO L180 IcfgInterpreter]: Interpretation finished