./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/list-simple/sll2n_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_b4d3653f-9a03-45e8-b18a-09309f4e92f6/bin/utaipan-verify-t7M7D8N6sZ/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4d3653f-9a03-45e8-b18a-09309f4e92f6/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_b4d3653f-9a03-45e8-b18a-09309f4e92f6/bin/utaipan-verify-t7M7D8N6sZ/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4d3653f-9a03-45e8-b18a-09309f4e92f6/bin/utaipan-verify-t7M7D8N6sZ/config/TaipanReach.xml -i ../../sv-benchmarks/c/list-simple/sll2n_prepend_unequal.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4d3653f-9a03-45e8-b18a-09309f4e92f6/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_b4d3653f-9a03-45e8-b18a-09309f4e92f6/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 277634da297b7f9e262585608ed7ad62cca7d59b0122d4e61ee1b4b78256acae --- Real Ultimate output --- This is Ultimate 0.2.3-dev-9bd2c7f [2023-11-19 05:11:34,839 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-11-19 05:11:34,918 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4d3653f-9a03-45e8-b18a-09309f4e92f6/bin/utaipan-verify-t7M7D8N6sZ/config/svcomp-Reach-32bit-Taipan_Default.epf [2023-11-19 05:11:34,924 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-11-19 05:11:34,925 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-11-19 05:11:34,952 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-11-19 05:11:34,953 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-11-19 05:11:34,954 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-11-19 05:11:34,954 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-11-19 05:11:34,955 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-11-19 05:11:34,956 INFO L153 SettingsManager]: * User list type=DISABLED [2023-11-19 05:11:34,956 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-11-19 05:11:34,957 INFO L153 SettingsManager]: * Explicit value domain=true [2023-11-19 05:11:34,958 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-11-19 05:11:34,958 INFO L153 SettingsManager]: * Octagon Domain=false [2023-11-19 05:11:34,959 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-11-19 05:11:34,960 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-11-19 05:11:34,960 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-11-19 05:11:34,961 INFO L153 SettingsManager]: * Interval Domain=false [2023-11-19 05:11:34,961 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-11-19 05:11:34,962 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-11-19 05:11:34,963 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2023-11-19 05:11:34,964 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-11-19 05:11:34,964 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-11-19 05:11:34,965 INFO L153 SettingsManager]: * sizeof long=4 [2023-11-19 05:11:34,965 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-11-19 05:11:34,966 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-11-19 05:11:34,966 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-11-19 05:11:34,967 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-11-19 05:11:34,967 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-11-19 05:11:34,968 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-11-19 05:11:34,968 INFO L153 SettingsManager]: * sizeof long double=12 [2023-11-19 05:11:34,986 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2023-11-19 05:11:34,986 INFO L153 SettingsManager]: * Use constant arrays=true [2023-11-19 05:11:34,986 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-11-19 05:11:34,987 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-11-19 05:11:34,987 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-19 05:11:34,988 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-11-19 05:11:34,988 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-11-19 05:11:34,988 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2023-11-19 05:11:34,989 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-11-19 05:11:34,989 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-11-19 05:11:34,989 INFO L153 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-11-19 05:11:34,990 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-11-19 05:11:34,990 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-11-19 05:11:34,991 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_b4d3653f-9a03-45e8-b18a-09309f4e92f6/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4d3653f-9a03-45e8-b18a-09309f4e92f6/bin/utaipan-verify-t7M7D8N6sZ Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 277634da297b7f9e262585608ed7ad62cca7d59b0122d4e61ee1b4b78256acae [2023-11-19 05:11:35,277 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-11-19 05:11:35,300 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-11-19 05:11:35,303 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-11-19 05:11:35,304 INFO L270 PluginConnector]: Initializing CDTParser... [2023-11-19 05:11:35,305 INFO L274 PluginConnector]: CDTParser initialized [2023-11-19 05:11:35,306 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4d3653f-9a03-45e8-b18a-09309f4e92f6/bin/utaipan-verify-t7M7D8N6sZ/../../sv-benchmarks/c/list-simple/sll2n_prepend_unequal.i [2023-11-19 05:11:38,479 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-11-19 05:11:38,823 INFO L384 CDTParser]: Found 1 translation units. [2023-11-19 05:11:38,824 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4d3653f-9a03-45e8-b18a-09309f4e92f6/sv-benchmarks/c/list-simple/sll2n_prepend_unequal.i [2023-11-19 05:11:38,844 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4d3653f-9a03-45e8-b18a-09309f4e92f6/bin/utaipan-verify-t7M7D8N6sZ/data/b8c02d564/f7327b977714461c8d60abfeee5a18db/FLAG8fe5f6fb3 [2023-11-19 05:11:38,861 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4d3653f-9a03-45e8-b18a-09309f4e92f6/bin/utaipan-verify-t7M7D8N6sZ/data/b8c02d564/f7327b977714461c8d60abfeee5a18db [2023-11-19 05:11:38,869 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-11-19 05:11:38,870 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-11-19 05:11:38,871 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-11-19 05:11:38,871 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-11-19 05:11:38,881 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-11-19 05:11:38,882 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.11 05:11:38" (1/1) ... [2023-11-19 05:11:38,883 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@56746989 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:11:38, skipping insertion in model container [2023-11-19 05:11:38,883 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.11 05:11:38" (1/1) ... [2023-11-19 05:11:38,931 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-11-19 05:11:39,269 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_b4d3653f-9a03-45e8-b18a-09309f4e92f6/sv-benchmarks/c/list-simple/sll2n_prepend_unequal.i[24165,24178] [2023-11-19 05:11:39,275 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-19 05:11:39,287 INFO L202 MainTranslator]: Completed pre-run [2023-11-19 05:11:39,359 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_b4d3653f-9a03-45e8-b18a-09309f4e92f6/sv-benchmarks/c/list-simple/sll2n_prepend_unequal.i[24165,24178] [2023-11-19 05:11:39,371 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-19 05:11:39,416 INFO L206 MainTranslator]: Completed translation [2023-11-19 05:11:39,417 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:11:39 WrapperNode [2023-11-19 05:11:39,417 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-11-19 05:11:39,418 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-11-19 05:11:39,419 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-11-19 05:11:39,419 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-11-19 05:11:39,427 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:11:39" (1/1) ... [2023-11-19 05:11:39,447 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:11:39" (1/1) ... [2023-11-19 05:11:39,477 INFO L138 Inliner]: procedures = 127, calls = 32, calls flagged for inlining = 6, calls inlined = 6, statements flattened = 114 [2023-11-19 05:11:39,477 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-11-19 05:11:39,478 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-11-19 05:11:39,478 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-11-19 05:11:39,478 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-11-19 05:11:39,488 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:11:39" (1/1) ... [2023-11-19 05:11:39,488 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:11:39" (1/1) ... [2023-11-19 05:11:39,507 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:11:39" (1/1) ... [2023-11-19 05:11:39,509 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:11:39" (1/1) ... [2023-11-19 05:11:39,517 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:11:39" (1/1) ... [2023-11-19 05:11:39,531 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:11:39" (1/1) ... [2023-11-19 05:11:39,533 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:11:39" (1/1) ... [2023-11-19 05:11:39,541 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:11:39" (1/1) ... [2023-11-19 05:11:39,544 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-11-19 05:11:39,552 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-11-19 05:11:39,552 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-11-19 05:11:39,552 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-11-19 05:11:39,553 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:11:39" (1/1) ... [2023-11-19 05:11:39,560 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-19 05:11:39,574 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4d3653f-9a03-45e8-b18a-09309f4e92f6/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 05:11:39,587 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4d3653f-9a03-45e8-b18a-09309f4e92f6/bin/utaipan-verify-t7M7D8N6sZ/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-11-19 05:11:39,602 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4d3653f-9a03-45e8-b18a-09309f4e92f6/bin/utaipan-verify-t7M7D8N6sZ/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-11-19 05:11:39,627 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-11-19 05:11:39,628 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-11-19 05:11:39,628 INFO L130 BoogieDeclarations]: Found specification of procedure node_create [2023-11-19 05:11:39,628 INFO L138 BoogieDeclarations]: Found implementation of procedure node_create [2023-11-19 05:11:39,628 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2023-11-19 05:11:39,629 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-11-19 05:11:39,629 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2023-11-19 05:11:39,629 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2023-11-19 05:11:39,629 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2023-11-19 05:11:39,629 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-11-19 05:11:39,630 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~$Pointer$ [2023-11-19 05:11:39,630 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-11-19 05:11:39,630 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-11-19 05:11:39,630 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-11-19 05:11:39,761 INFO L236 CfgBuilder]: Building ICFG [2023-11-19 05:11:39,764 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2023-11-19 05:11:39,980 INFO L277 CfgBuilder]: Performing block encoding [2023-11-19 05:11:40,114 INFO L297 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-11-19 05:11:40,115 INFO L302 CfgBuilder]: Removed 3 assume(true) statements. [2023-11-19 05:11:40,120 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.11 05:11:40 BoogieIcfgContainer [2023-11-19 05:11:40,128 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-11-19 05:11:40,131 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-11-19 05:11:40,131 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-11-19 05:11:40,134 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-11-19 05:11:40,135 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 19.11 05:11:38" (1/3) ... [2023-11-19 05:11:40,135 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@25f6bc23 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.11 05:11:40, skipping insertion in model container [2023-11-19 05:11:40,136 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:11:39" (2/3) ... [2023-11-19 05:11:40,136 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@25f6bc23 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.11 05:11:40, skipping insertion in model container [2023-11-19 05:11:40,136 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.11 05:11:40" (3/3) ... [2023-11-19 05:11:40,137 INFO L112 eAbstractionObserver]: Analyzing ICFG sll2n_prepend_unequal.i [2023-11-19 05:11:40,157 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-11-19 05:11:40,157 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-11-19 05:11:40,208 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-11-19 05:11:40,216 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;@78513c2, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-11-19 05:11:40,216 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-11-19 05:11:40,221 INFO L276 IsEmpty]: Start isEmpty. Operand has 19 states, 14 states have (on average 1.5714285714285714) internal successors, (22), 15 states have internal predecessors, (22), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-11-19 05:11:40,229 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2023-11-19 05:11:40,229 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:11:40,230 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 05:11:40,230 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 05:11:40,236 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:11:40,236 INFO L85 PathProgramCache]: Analyzing trace with hash -1239839580, now seen corresponding path program 1 times [2023-11-19 05:11:40,247 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:11:40,247 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1909529869] [2023-11-19 05:11:40,247 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:11:40,248 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:11:40,372 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:11:40,610 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 05:11:40,611 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:11:40,611 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1909529869] [2023-11-19 05:11:40,612 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1909529869] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-19 05:11:40,612 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-19 05:11:40,612 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-11-19 05:11:40,614 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2000584176] [2023-11-19 05:11:40,615 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 05:11:40,619 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-19 05:11:40,619 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:11:40,648 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-19 05:11:40,648 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-19 05:11:40,651 INFO L87 Difference]: Start difference. First operand has 19 states, 14 states have (on average 1.5714285714285714) internal successors, (22), 15 states have internal predecessors, (22), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Second operand has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 3 states have internal predecessors, (7), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-11-19 05:11:40,718 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:11:40,718 INFO L93 Difference]: Finished difference Result 37 states and 51 transitions. [2023-11-19 05:11:40,720 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-19 05:11:40,721 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 3 states have internal predecessors, (7), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 9 [2023-11-19 05:11:40,721 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:11:40,728 INFO L225 Difference]: With dead ends: 37 [2023-11-19 05:11:40,728 INFO L226 Difference]: Without dead ends: 18 [2023-11-19 05:11:40,732 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 05:11:40,741 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 1 mSDsluCounter, 16 mSDsCounter, 0 mSdLazyCounter, 17 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 32 SdHoareTripleChecker+Invalid, 17 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 17 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-19 05:11:40,743 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [2 Valid, 32 Invalid, 17 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 17 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-19 05:11:40,760 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2023-11-19 05:11:40,779 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 16. [2023-11-19 05:11:40,780 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 16 states, 12 states have (on average 1.3333333333333333) internal successors, (16), 12 states have internal predecessors, (16), 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 05:11:40,782 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 20 transitions. [2023-11-19 05:11:40,783 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 20 transitions. Word has length 9 [2023-11-19 05:11:40,784 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:11:40,785 INFO L495 AbstractCegarLoop]: Abstraction has 16 states and 20 transitions. [2023-11-19 05:11:40,785 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 2.3333333333333335) internal successors, (7), 3 states have internal predecessors, (7), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-11-19 05:11:40,785 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 20 transitions. [2023-11-19 05:11:40,787 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2023-11-19 05:11:40,787 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:11:40,788 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 05:11:40,789 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-11-19 05:11:40,789 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 05:11:40,790 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:11:40,791 INFO L85 PathProgramCache]: Analyzing trace with hash 843205444, now seen corresponding path program 1 times [2023-11-19 05:11:40,791 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:11:40,791 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [70389953] [2023-11-19 05:11:40,793 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:11:40,793 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:11:40,866 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:11:41,026 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-11-19 05:11:41,026 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:11:41,027 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [70389953] [2023-11-19 05:11:41,027 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [70389953] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 05:11:41,027 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1888256831] [2023-11-19 05:11:41,027 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:11:41,028 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:11:41,028 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4d3653f-9a03-45e8-b18a-09309f4e92f6/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 05:11:41,030 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4d3653f-9a03-45e8-b18a-09309f4e92f6/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 05:11:41,041 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4d3653f-9a03-45e8-b18a-09309f4e92f6/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-11-19 05:11:41,230 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:11:41,235 INFO L262 TraceCheckSpWp]: Trace formula consists of 231 conjuncts, 5 conjunts are in the unsatisfiable core [2023-11-19 05:11:41,242 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 05:11:41,315 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 3 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 05:11:41,315 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-19 05:11:41,365 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-11-19 05:11:41,369 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1888256831] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-19 05:11:41,370 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1205457179] [2023-11-19 05:11:41,397 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2023-11-19 05:11:41,397 INFO L166 IcfgInterpreter]: Building call graph [2023-11-19 05:11:41,401 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-19 05:11:41,406 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-19 05:11:41,408 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-19 05:11:43,738 INFO L197 IcfgInterpreter]: Interpreting procedure node_create with input of size 139 for LOIs [2023-11-19 05:11:44,049 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-19 05:11:52,877 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '185#(and (= |ULTIMATE.start_main_~uneq~0#1| 5) (= (select (select |#memory_$Pointer$.offset| |ULTIMATE.start_main_~#s~0#1.base|) 0) |ULTIMATE.start_main_~ptr~0#1.offset|) (not (= 5 (select (select |#memory_int| |ULTIMATE.start_main_~ptr~0#1.base|) |ULTIMATE.start_main_~ptr~0#1.offset|))) (= |ULTIMATE.start_sll_create_#res#1.offset| 0) (= |ULTIMATE.start_main_~data~0#1| 1) (= |ULTIMATE.start_main_~#s~0#1.offset| 0) (= |ULTIMATE.start_main_~len~0#1| 2) (exists ((|v_#memory_$Pointer$.base_53| (Array Int (Array Int Int))) (|v_#memory_$Pointer$.offset_53| (Array Int (Array Int Int))) (|v_#memory_int_64| (Array Int (Array Int Int))) (|v_#memory_int_20| (Array Int (Array Int Int))) (|v_ULTIMATE.start_sll_prepend_~head#1.base_14| Int) (|v_ULTIMATE.start_sll_prepend_#in~head#1.base_11| Int)) (and (or (and (exists ((|v_#memory_$Pointer$.offset_49| (Array Int (Array Int Int)))) (= (store |v_#memory_$Pointer$.offset_49| (select (select |#memory_$Pointer$.base| |v_ULTIMATE.start_sll_prepend_~head#1.base_14|) 0) (store (store (select |v_#memory_$Pointer$.offset_49| (select (select |#memory_$Pointer$.base| |v_ULTIMATE.start_sll_prepend_~head#1.base_14|) 0)) 4 0) 0 (select (select |v_#memory_$Pointer$.offset_53| (select (select |#memory_$Pointer$.base| |v_ULTIMATE.start_sll_prepend_~head#1.base_14|) 0)) 0))) |v_#memory_$Pointer$.offset_53|)) (exists ((|v_#length_23| (Array Int Int))) (= |#length| (store |v_#length_23| (select (select |#memory_$Pointer$.base| |v_ULTIMATE.start_sll_prepend_~head#1.base_14|) 0) 8))) (= |v_ULTIMATE.start_sll_prepend_~head#1.base_14| |v_ULTIMATE.start_sll_prepend_#in~head#1.base_11|) (exists ((|v_#memory_$Pointer$.base_49| (Array Int (Array Int Int)))) (= (store |v_#memory_$Pointer$.base_49| (select (select |#memory_$Pointer$.base| |v_ULTIMATE.start_sll_prepend_~head#1.base_14|) 0) (store (store (select |v_#memory_$Pointer$.base_49| (select (select |#memory_$Pointer$.base| |v_ULTIMATE.start_sll_prepend_~head#1.base_14|) 0)) 4 0) 0 (select (select |v_#memory_$Pointer$.base_53| (select (select |#memory_$Pointer$.base| |v_ULTIMATE.start_sll_prepend_~head#1.base_14|) 0)) 0))) |v_#memory_$Pointer$.base_53|)) (exists ((|v_#memory_$Pointer$.base_52| (Array Int (Array Int Int))) (|v_old(#memory_$Pointer$.base)_AFTER_CALL_9| (Array Int (Array Int Int)))) (and (= |v_old(#memory_$Pointer$.base)_AFTER_CALL_9| (store |v_#memory_$Pointer$.base_52| |ULTIMATE.start_sll_create_#res#1.base| (store (select |v_#memory_$Pointer$.base_52| |ULTIMATE.start_sll_create_#res#1.base|) 4 (select (select |v_old(#memory_$Pointer$.base)_AFTER_CALL_9| |ULTIMATE.start_sll_create_#res#1.base|) 4)))) (= (select (select |v_old(#memory_$Pointer$.base)_AFTER_CALL_9| |ULTIMATE.start_main_~#s~0#1.base|) 0) |ULTIMATE.start_sll_create_#res#1.base|))) (exists ((|v_#memory_int_63| (Array Int (Array Int Int))) (|v_old(#memory_int)_AFTER_CALL_9| (Array Int (Array Int Int)))) (= |v_old(#memory_int)_AFTER_CALL_9| (store |v_#memory_int_63| |ULTIMATE.start_sll_create_#res#1.base| (store (select |v_#memory_int_63| |ULTIMATE.start_sll_create_#res#1.base|) 4 (select (select |v_old(#memory_int)_AFTER_CALL_9| |ULTIMATE.start_sll_create_#res#1.base|) 4))))) (exists ((|v_#valid_33| (Array Int Int))) (and (= (store |v_#valid_33| (select (select |#memory_$Pointer$.base| |v_ULTIMATE.start_sll_prepend_~head#1.base_14|) 0) 1) |#valid|) (= (select |v_#valid_33| (select (select |#memory_$Pointer$.base| |v_ULTIMATE.start_sll_prepend_~head#1.base_14|) 0)) 0))) (exists ((|v_#memory_$Pointer$.offset_52| (Array Int (Array Int Int)))) (= (select (select (store |v_#memory_$Pointer$.offset_52| |ULTIMATE.start_sll_create_#res#1.base| (store (select |v_#memory_$Pointer$.offset_52| |ULTIMATE.start_sll_create_#res#1.base|) 4 0)) |ULTIMATE.start_main_~#s~0#1.base|) 0) 0)) (exists ((|v_#memory_int_32| (Array Int (Array Int Int))) (|v_#memory_int_60| (Array Int (Array Int Int)))) (and (= |v_#memory_int_32| (store |v_#memory_int_60| (select (select |#memory_$Pointer$.base| |v_ULTIMATE.start_sll_prepend_~head#1.base_14|) 0) (store (select |v_#memory_int_60| (select (select |#memory_$Pointer$.base| |v_ULTIMATE.start_sll_prepend_~head#1.base_14|) 0)) 4 (select (select |v_#memory_int_32| (select (select |#memory_$Pointer$.base| |v_ULTIMATE.start_sll_prepend_~head#1.base_14|) 0)) 4)))) (= (store |v_#memory_int_32| (select (select |#memory_$Pointer$.base| |v_ULTIMATE.start_sll_prepend_~head#1.base_14|) 0) (store (select |v_#memory_int_32| (select (select |#memory_$Pointer$.base| |v_ULTIMATE.start_sll_prepend_~head#1.base_14|) 0)) 0 5)) |v_#memory_int_64|))) (= |v_ULTIMATE.start_sll_prepend_#in~head#1.base_11| |ULTIMATE.start_main_~#s~0#1.base|) (<= (+ 1 (select (select |#memory_$Pointer$.base| |v_ULTIMATE.start_sll_prepend_~head#1.base_14|) 0)) |#StackHeapBarrier|)) (and (exists ((|v_#memory_$Pointer$.offset_49| (Array Int (Array Int Int)))) (= (store |v_#memory_$Pointer$.offset_49| (select (select |#memory_$Pointer$.base| |v_ULTIMATE.start_sll_prepend_~head#1.base_14|) 0) (store (store (select |v_#memory_$Pointer$.offset_49| (select (select |#memory_$Pointer$.base| |v_ULTIMATE.start_sll_prepend_~head#1.base_14|) 0)) 4 0) 0 (select (select |v_#memory_$Pointer$.offset_53| (select (select |#memory_$Pointer$.base| |v_ULTIMATE.start_sll_prepend_~head#1.base_14|) 0)) 0))) |v_#memory_$Pointer$.offset_53|)) (exists ((|v_#memory_$Pointer$.base_52| (Array Int (Array Int Int))) (|v_old(#memory_$Pointer$.base)_AFTER_CALL_10| (Array Int (Array Int Int)))) (and (= |v_old(#memory_$Pointer$.base)_AFTER_CALL_10| (store |v_#memory_$Pointer$.base_52| |ULTIMATE.start_sll_create_#res#1.base| (store (select |v_#memory_$Pointer$.base_52| |ULTIMATE.start_sll_create_#res#1.base|) 4 (select (select |v_old(#memory_$Pointer$.base)_AFTER_CALL_10| |ULTIMATE.start_sll_create_#res#1.base|) 4)))) (= (select (select |v_old(#memory_$Pointer$.base)_AFTER_CALL_10| |ULTIMATE.start_main_~#s~0#1.base|) 0) |ULTIMATE.start_sll_create_#res#1.base|))) (exists ((|v_#length_23| (Array Int Int))) (= |#length| (store |v_#length_23| (select (select |#memory_$Pointer$.base| |v_ULTIMATE.start_sll_prepend_~head#1.base_14|) 0) 8))) (= |v_ULTIMATE.start_sll_prepend_~head#1.base_14| |v_ULTIMATE.start_sll_prepend_#in~head#1.base_11|) (exists ((|v_#memory_$Pointer$.base_49| (Array Int (Array Int Int)))) (= (store |v_#memory_$Pointer$.base_49| (select (select |#memory_$Pointer$.base| |v_ULTIMATE.start_sll_prepend_~head#1.base_14|) 0) (store (store (select |v_#memory_$Pointer$.base_49| (select (select |#memory_$Pointer$.base| |v_ULTIMATE.start_sll_prepend_~head#1.base_14|) 0)) 4 0) 0 (select (select |v_#memory_$Pointer$.base_53| (select (select |#memory_$Pointer$.base| |v_ULTIMATE.start_sll_prepend_~head#1.base_14|) 0)) 0))) |v_#memory_$Pointer$.base_53|)) (exists ((|v_#memory_int_63| (Array Int (Array Int Int))) (|v_old(#memory_int)_AFTER_CALL_10| (Array Int (Array Int Int)))) (= |v_old(#memory_int)_AFTER_CALL_10| (store |v_#memory_int_63| |ULTIMATE.start_sll_create_#res#1.base| (store (select |v_#memory_int_63| |ULTIMATE.start_sll_create_#res#1.base|) 4 (select (select |v_old(#memory_int)_AFTER_CALL_10| |ULTIMATE.start_sll_create_#res#1.base|) 4))))) (exists ((|v_#valid_33| (Array Int Int))) (and (= (store |v_#valid_33| (select (select |#memory_$Pointer$.base| |v_ULTIMATE.start_sll_prepend_~head#1.base_14|) 0) 1) |#valid|) (= (select |v_#valid_33| (select (select |#memory_$Pointer$.base| |v_ULTIMATE.start_sll_prepend_~head#1.base_14|) 0)) 0))) (exists ((|v_#memory_$Pointer$.offset_52| (Array Int (Array Int Int)))) (= (select (select (store |v_#memory_$Pointer$.offset_52| |ULTIMATE.start_sll_create_#res#1.base| (store (select |v_#memory_$Pointer$.offset_52| |ULTIMATE.start_sll_create_#res#1.base|) 4 0)) |ULTIMATE.start_main_~#s~0#1.base|) 0) 0)) (exists ((|v_#memory_int_32| (Array Int (Array Int Int))) (|v_#memory_int_60| (Array Int (Array Int Int)))) (and (= |v_#memory_int_32| (store |v_#memory_int_60| (select (select |#memory_$Pointer$.base| |v_ULTIMATE.start_sll_prepend_~head#1.base_14|) 0) (store (select |v_#memory_int_60| (select (select |#memory_$Pointer$.base| |v_ULTIMATE.start_sll_prepend_~head#1.base_14|) 0)) 4 (select (select |v_#memory_int_32| (select (select |#memory_$Pointer$.base| |v_ULTIMATE.start_sll_prepend_~head#1.base_14|) 0)) 4)))) (= (store |v_#memory_int_32| (select (select |#memory_$Pointer$.base| |v_ULTIMATE.start_sll_prepend_~head#1.base_14|) 0) (store (select |v_#memory_int_32| (select (select |#memory_$Pointer$.base| |v_ULTIMATE.start_sll_prepend_~head#1.base_14|) 0)) 0 5)) |v_#memory_int_64|))) (= |v_ULTIMATE.start_sll_prepend_#in~head#1.base_11| |ULTIMATE.start_main_~#s~0#1.base|) (<= (+ 1 (select (select |#memory_$Pointer$.base| |v_ULTIMATE.start_sll_prepend_~head#1.base_14|) 0)) |#StackHeapBarrier|))) (= |#memory_int| (store |v_#memory_int_20| |v_ULTIMATE.start_sll_prepend_~head#1.base_14| (store (select |v_#memory_int_20| |v_ULTIMATE.start_sll_prepend_~head#1.base_14|) 0 (select (select |#memory_int| |v_ULTIMATE.start_sll_prepend_~head#1.base_14|) 0)))) (= |v_#memory_int_20| (store |v_#memory_int_64| (select (select |#memory_$Pointer$.base| |v_ULTIMATE.start_sll_prepend_~head#1.base_14|) 0) (store (select |v_#memory_int_64| (select (select |#memory_$Pointer$.base| |v_ULTIMATE.start_sll_prepend_~head#1.base_14|) 0)) 4 (select (select |v_#memory_int_20| (select (select |#memory_$Pointer$.base| |v_ULTIMATE.start_sll_prepend_~head#1.base_14|) 0)) 4)))) (= |#memory_$Pointer$.offset| (store (store |v_#memory_$Pointer$.offset_53| (select (select |#memory_$Pointer$.base| |v_ULTIMATE.start_sll_prepend_~head#1.base_14|) 0) (store (select |v_#memory_$Pointer$.offset_53| (select (select |#memory_$Pointer$.base| |v_ULTIMATE.start_sll_prepend_~head#1.base_14|) 0)) 4 (select (select |v_#memory_$Pointer$.offset_53| |v_ULTIMATE.start_sll_prepend_~head#1.base_14|) 0))) |v_ULTIMATE.start_sll_prepend_~head#1.base_14| (store (select (store |v_#memory_$Pointer$.offset_53| (select (select |#memory_$Pointer$.base| |v_ULTIMATE.start_sll_prepend_~head#1.base_14|) 0) (store (select |v_#memory_$Pointer$.offset_53| (select (select |#memory_$Pointer$.base| |v_ULTIMATE.start_sll_prepend_~head#1.base_14|) 0)) 4 (select (select |v_#memory_$Pointer$.offset_53| |v_ULTIMATE.start_sll_prepend_~head#1.base_14|) 0))) |v_ULTIMATE.start_sll_prepend_~head#1.base_14|) 0 0))) (= |#memory_$Pointer$.base| (store (store |v_#memory_$Pointer$.base_53| (select (select |#memory_$Pointer$.base| |v_ULTIMATE.start_sll_prepend_~head#1.base_14|) 0) (store (select |v_#memory_$Pointer$.base_53| (select (select |#memory_$Pointer$.base| |v_ULTIMATE.start_sll_prepend_~head#1.base_14|) 0)) 4 (select (select |v_#memory_$Pointer$.base_53| |v_ULTIMATE.start_sll_prepend_~head#1.base_14|) 0))) |v_ULTIMATE.start_sll_prepend_~head#1.base_14| (store (select (store |v_#memory_$Pointer$.base_53| (select (select |#memory_$Pointer$.base| |v_ULTIMATE.start_sll_prepend_~head#1.base_14|) 0) (store (select |v_#memory_$Pointer$.base_53| (select (select |#memory_$Pointer$.base| |v_ULTIMATE.start_sll_prepend_~head#1.base_14|) 0)) 4 (select (select |v_#memory_$Pointer$.base_53| |v_ULTIMATE.start_sll_prepend_~head#1.base_14|) 0))) |v_ULTIMATE.start_sll_prepend_~head#1.base_14|) 0 (select (select |#memory_$Pointer$.base| |v_ULTIMATE.start_sll_prepend_~head#1.base_14|) 0)))))) (= (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 [2023-11-19 05:11:52,878 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-19 05:11:52,878 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-19 05:11:52,878 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 5 [2023-11-19 05:11:52,879 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [30136217] [2023-11-19 05:11:52,879 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-19 05:11:52,880 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-11-19 05:11:52,880 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:11:52,881 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-11-19 05:11:52,882 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=177, Unknown=1, NotChecked=0, Total=210 [2023-11-19 05:11:52,882 INFO L87 Difference]: Start difference. First operand 16 states and 20 transitions. Second operand has 5 states, 5 states have (on average 2.8) internal successors, (14), 5 states have internal predecessors, (14), 3 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) [2023-11-19 05:11:52,934 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:11:52,935 INFO L93 Difference]: Finished difference Result 30 states and 38 transitions. [2023-11-19 05:11:52,936 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-11-19 05:11:52,936 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.8) internal successors, (14), 5 states have internal predecessors, (14), 3 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) Word has length 15 [2023-11-19 05:11:52,936 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:11:52,937 INFO L225 Difference]: With dead ends: 30 [2023-11-19 05:11:52,937 INFO L226 Difference]: Without dead ends: 19 [2023-11-19 05:11:52,938 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 32 SyntacticMatches, 2 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 37 ImplicationChecksByTransitivity, 8.9s TimeCoverageRelationStatistics Valid=32, Invalid=177, Unknown=1, NotChecked=0, Total=210 [2023-11-19 05:11:52,939 INFO L413 NwaCegarLoop]: 12 mSDtfsCounter, 1 mSDsluCounter, 11 mSDsCounter, 0 mSdLazyCounter, 18 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 23 SdHoareTripleChecker+Invalid, 19 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 18 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-19 05:11:52,940 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [2 Valid, 23 Invalid, 19 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 18 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-19 05:11:52,941 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2023-11-19 05:11:52,944 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2023-11-19 05:11:52,944 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19 states, 14 states have (on average 1.2857142857142858) internal successors, (18), 14 states have internal predecessors, (18), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-11-19 05:11:52,945 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 24 transitions. [2023-11-19 05:11:52,945 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 24 transitions. Word has length 15 [2023-11-19 05:11:52,946 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:11:52,946 INFO L495 AbstractCegarLoop]: Abstraction has 19 states and 24 transitions. [2023-11-19 05:11:52,946 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 2.8) internal successors, (14), 5 states have internal predecessors, (14), 3 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) [2023-11-19 05:11:52,946 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 24 transitions. [2023-11-19 05:11:52,947 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2023-11-19 05:11:52,947 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:11:52,947 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 05:11:52,975 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4d3653f-9a03-45e8-b18a-09309f4e92f6/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-11-19 05:11:53,169 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4d3653f-9a03-45e8-b18a-09309f4e92f6/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:11:53,170 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 05:11:53,170 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:11:53,170 INFO L85 PathProgramCache]: Analyzing trace with hash -532049436, now seen corresponding path program 2 times [2023-11-19 05:11:53,170 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:11:53,171 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1464757710] [2023-11-19 05:11:53,171 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:11:53,171 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:11:53,264 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:11:54,238 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2023-11-19 05:11:54,238 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:11:54,238 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1464757710] [2023-11-19 05:11:54,238 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1464757710] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-19 05:11:54,238 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-19 05:11:54,239 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2023-11-19 05:11:54,239 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [882468939] [2023-11-19 05:11:54,239 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 05:11:54,239 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2023-11-19 05:11:54,239 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:11:54,240 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2023-11-19 05:11:54,240 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2023-11-19 05:11:54,241 INFO L87 Difference]: Start difference. First operand 19 states and 24 transitions. Second operand has 8 states, 6 states have (on average 1.8333333333333333) internal successors, (11), 7 states have internal predecessors, (11), 2 states have call successors, (2), 1 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-11-19 05:11:54,464 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:11:54,464 INFO L93 Difference]: Finished difference Result 21 states and 25 transitions. [2023-11-19 05:11:54,465 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2023-11-19 05:11:54,466 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 6 states have (on average 1.8333333333333333) internal successors, (11), 7 states have internal predecessors, (11), 2 states have call successors, (2), 1 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 21 [2023-11-19 05:11:54,466 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:11:54,466 INFO L225 Difference]: With dead ends: 21 [2023-11-19 05:11:54,467 INFO L226 Difference]: Without dead ends: 19 [2023-11-19 05:11:54,467 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2023-11-19 05:11:54,468 INFO L413 NwaCegarLoop]: 9 mSDtfsCounter, 9 mSDsluCounter, 34 mSDsCounter, 0 mSdLazyCounter, 58 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 43 SdHoareTripleChecker+Invalid, 59 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 58 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-19 05:11:54,469 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [10 Valid, 43 Invalid, 59 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 58 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-19 05:11:54,470 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2023-11-19 05:11:54,475 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2023-11-19 05:11:54,475 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 19 states, 14 states have (on average 1.2142857142857142) internal successors, (17), 14 states have internal predecessors, (17), 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 05:11:54,478 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 23 transitions. [2023-11-19 05:11:54,478 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 23 transitions. Word has length 21 [2023-11-19 05:11:54,479 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:11:54,479 INFO L495 AbstractCegarLoop]: Abstraction has 19 states and 23 transitions. [2023-11-19 05:11:54,479 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 6 states have (on average 1.8333333333333333) internal successors, (11), 7 states have internal predecessors, (11), 2 states have call successors, (2), 1 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-11-19 05:11:54,479 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 23 transitions. [2023-11-19 05:11:54,481 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2023-11-19 05:11:54,481 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:11:54,481 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 05:11:54,482 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2023-11-19 05:11:54,482 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-19 05:11:54,482 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:11:54,483 INFO L85 PathProgramCache]: Analyzing trace with hash -198365761, now seen corresponding path program 1 times [2023-11-19 05:11:54,483 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:11:54,483 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [936841936] [2023-11-19 05:11:54,483 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:11:54,484 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:11:54,564 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:11:56,932 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 6 proven. 5 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-11-19 05:11:56,933 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:11:56,933 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [936841936] [2023-11-19 05:11:56,933 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [936841936] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 05:11:56,933 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1412721799] [2023-11-19 05:11:56,933 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:11:56,933 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:11:56,934 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4d3653f-9a03-45e8-b18a-09309f4e92f6/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 05:11:56,936 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4d3653f-9a03-45e8-b18a-09309f4e92f6/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 05:11:56,949 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b4d3653f-9a03-45e8-b18a-09309f4e92f6/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-11-19 05:11:57,094 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:11:57,098 INFO L262 TraceCheckSpWp]: Trace formula consists of 324 conjuncts, 104 conjunts are in the unsatisfiable core [2023-11-19 05:11:57,108 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 05:11:57,239 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 05:11:57,268 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2023-11-19 05:11:57,430 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 23 treesize of output 11 [2023-11-19 05:11:57,655 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 30 treesize of output 18 [2023-11-19 05:11:57,662 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 05:11:57,672 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 05:11:57,678 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 [2023-11-19 05:11:57,850 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-19 05:11:57,852 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 [2023-11-19 05:11:57,871 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-19 05:11:57,872 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 38 treesize of output 29 [2023-11-19 05:11:57,914 INFO L349 Elim1Store]: treesize reduction 21, result has 44.7 percent of original size [2023-11-19 05:11:57,915 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 20 treesize of output 23 [2023-11-19 05:11:57,955 INFO L349 Elim1Store]: treesize reduction 4, result has 66.7 percent of original size [2023-11-19 05:11:57,955 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 [2023-11-19 05:11:58,121 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-19 05:11:58,123 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-19 05:11:58,135 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 33 treesize of output 15 [2023-11-19 05:11:58,157 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-19 05:11:58,200 INFO L349 Elim1Store]: treesize reduction 16, result has 50.0 percent of original size [2023-11-19 05:11:58,200 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 59 treesize of output 37 [2023-11-19 05:11:58,220 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-19 05:11:58,261 INFO L349 Elim1Store]: treesize reduction 16, result has 55.6 percent of original size [2023-11-19 05:11:58,262 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 2 new quantified variables, introduced 2 case distinctions, treesize of input 88 treesize of output 51 [2023-11-19 05:11:59,400 INFO L349 Elim1Store]: treesize reduction 77, result has 68.0 percent of original size [2023-11-19 05:11:59,401 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 7 select indices, 7 select index equivalence classes, 0 disjoint index pairs (out of 21 index pairs), introduced 8 new quantified variables, introduced 21 case distinctions, treesize of input 225 treesize of output 295 [2023-11-19 05:12:00,155 INFO L349 Elim1Store]: treesize reduction 85, result has 73.2 percent of original size [2023-11-19 05:12:00,155 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 8 select indices, 8 select index equivalence classes, 0 disjoint index pairs (out of 28 index pairs), introduced 8 new quantified variables, introduced 28 case distinctions, treesize of input 133 treesize of output 332 [2023-11-19 05:12:02,305 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 6 proven. 5 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-11-19 05:12:02,305 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-19 05:12:23,799 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1412721799] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 05:12:23,800 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1194465502] [2023-11-19 05:12:23,803 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-11-19 05:12:23,803 INFO L166 IcfgInterpreter]: Building call graph [2023-11-19 05:12:23,804 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-19 05:12:23,804 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-19 05:12:23,805 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-19 05:12:25,355 INFO L197 IcfgInterpreter]: Interpreting procedure node_create with input of size 139 for LOIs [2023-11-19 05:12:25,592 INFO L180 IcfgInterpreter]: Interpretation finished