./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 527bcce2 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_2532c692-1d00-4804-a28e-ab6a707b70b0/bin/utaipan-verify-QoSU8krkJ5/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2532c692-1d00-4804-a28e-ab6a707b70b0/bin/utaipan-verify-QoSU8krkJ5/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2532c692-1d00-4804-a28e-ab6a707b70b0/bin/utaipan-verify-QoSU8krkJ5/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2532c692-1d00-4804-a28e-ab6a707b70b0/bin/utaipan-verify-QoSU8krkJ5/config/TaipanReach.xml -i ../../sv-benchmarks/c/list-simple/sll2n_prepend_unequal.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2532c692-1d00-4804-a28e-ab6a707b70b0/bin/utaipan-verify-QoSU8krkJ5/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2532c692-1d00-4804-a28e-ab6a707b70b0/bin/utaipan-verify-QoSU8krkJ5 --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-527bcce [2023-11-21 19:49:11,319 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-11-21 19:49:11,433 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2532c692-1d00-4804-a28e-ab6a707b70b0/bin/utaipan-verify-QoSU8krkJ5/config/svcomp-Reach-32bit-Taipan_Default.epf [2023-11-21 19:49:11,445 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-11-21 19:49:11,446 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-11-21 19:49:11,495 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-11-21 19:49:11,496 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-11-21 19:49:11,496 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-11-21 19:49:11,497 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-11-21 19:49:11,502 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-11-21 19:49:11,503 INFO L153 SettingsManager]: * User list type=DISABLED [2023-11-21 19:49:11,504 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-11-21 19:49:11,504 INFO L153 SettingsManager]: * Explicit value domain=true [2023-11-21 19:49:11,506 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-11-21 19:49:11,507 INFO L153 SettingsManager]: * Octagon Domain=false [2023-11-21 19:49:11,507 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-11-21 19:49:11,507 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-11-21 19:49:11,508 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-11-21 19:49:11,509 INFO L153 SettingsManager]: * Interval Domain=false [2023-11-21 19:49:11,509 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-11-21 19:49:11,509 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-11-21 19:49:11,510 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2023-11-21 19:49:11,513 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-11-21 19:49:11,514 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-11-21 19:49:11,514 INFO L153 SettingsManager]: * sizeof long=4 [2023-11-21 19:49:11,515 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-11-21 19:49:11,515 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-11-21 19:49:11,515 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-11-21 19:49:11,516 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-11-21 19:49:11,516 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-11-21 19:49:11,517 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-11-21 19:49:11,518 INFO L153 SettingsManager]: * sizeof long double=12 [2023-11-21 19:49:11,518 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2023-11-21 19:49:11,518 INFO L153 SettingsManager]: * Use constant arrays=true [2023-11-21 19:49:11,519 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-11-21 19:49:11,519 INFO L153 SettingsManager]: * Only consider context switches at boundaries of atomic blocks=true [2023-11-21 19:49:11,519 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-11-21 19:49:11,519 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-21 19:49:11,520 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-11-21 19:49:11,520 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-11-21 19:49:11,520 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2023-11-21 19:49:11,520 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-11-21 19:49:11,521 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-11-21 19:49:11,521 INFO L153 SettingsManager]: * Apply one-shot large block encoding in concurrent analysis=false [2023-11-21 19:49:11,521 INFO L153 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-11-21 19:49:11,522 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-11-21 19:49:11,522 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-11-21 19:49:11,522 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_2532c692-1d00-4804-a28e-ab6a707b70b0/bin/utaipan-verify-QoSU8krkJ5/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2532c692-1d00-4804-a28e-ab6a707b70b0/bin/utaipan-verify-QoSU8krkJ5 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 277634da297b7f9e262585608ed7ad62cca7d59b0122d4e61ee1b4b78256acae [2023-11-21 19:49:11,914 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-11-21 19:49:11,945 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-11-21 19:49:11,947 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-11-21 19:49:11,949 INFO L270 PluginConnector]: Initializing CDTParser... [2023-11-21 19:49:11,950 INFO L274 PluginConnector]: CDTParser initialized [2023-11-21 19:49:11,951 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2532c692-1d00-4804-a28e-ab6a707b70b0/bin/utaipan-verify-QoSU8krkJ5/../../sv-benchmarks/c/list-simple/sll2n_prepend_unequal.i [2023-11-21 19:49:15,282 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-11-21 19:49:15,575 INFO L384 CDTParser]: Found 1 translation units. [2023-11-21 19:49:15,576 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2532c692-1d00-4804-a28e-ab6a707b70b0/sv-benchmarks/c/list-simple/sll2n_prepend_unequal.i [2023-11-21 19:49:15,600 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2532c692-1d00-4804-a28e-ab6a707b70b0/bin/utaipan-verify-QoSU8krkJ5/data/1382ad38b/f3efe24a4fa8437a8d97da8175badbe5/FLAG3b99405bd [2023-11-21 19:49:15,619 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2532c692-1d00-4804-a28e-ab6a707b70b0/bin/utaipan-verify-QoSU8krkJ5/data/1382ad38b/f3efe24a4fa8437a8d97da8175badbe5 [2023-11-21 19:49:15,625 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-11-21 19:49:15,626 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-11-21 19:49:15,630 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-11-21 19:49:15,630 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-11-21 19:49:15,636 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-11-21 19:49:15,639 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.11 07:49:15" (1/1) ... [2023-11-21 19:49:15,640 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@22cb2e00 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 07:49:15, skipping insertion in model container [2023-11-21 19:49:15,640 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.11 07:49:15" (1/1) ... [2023-11-21 19:49:15,701 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-11-21 19:49:16,202 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_2532c692-1d00-4804-a28e-ab6a707b70b0/sv-benchmarks/c/list-simple/sll2n_prepend_unequal.i[24165,24178] [2023-11-21 19:49:16,208 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-21 19:49:16,220 INFO L202 MainTranslator]: Completed pre-run [2023-11-21 19:49:16,289 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_2532c692-1d00-4804-a28e-ab6a707b70b0/sv-benchmarks/c/list-simple/sll2n_prepend_unequal.i[24165,24178] [2023-11-21 19:49:16,290 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-21 19:49:16,323 INFO L206 MainTranslator]: Completed translation [2023-11-21 19:49:16,323 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 07:49:16 WrapperNode [2023-11-21 19:49:16,324 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-11-21 19:49:16,325 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-11-21 19:49:16,326 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-11-21 19:49:16,326 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-11-21 19:49:16,334 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 07:49:16" (1/1) ... [2023-11-21 19:49:16,349 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 07:49:16" (1/1) ... [2023-11-21 19:49:16,378 INFO L138 Inliner]: procedures = 127, calls = 32, calls flagged for inlining = 6, calls inlined = 6, statements flattened = 114 [2023-11-21 19:49:16,378 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-11-21 19:49:16,379 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-11-21 19:49:16,379 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-11-21 19:49:16,380 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-11-21 19:49:16,389 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 07:49:16" (1/1) ... [2023-11-21 19:49:16,390 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 07:49:16" (1/1) ... [2023-11-21 19:49:16,394 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 07:49:16" (1/1) ... [2023-11-21 19:49:16,395 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 07:49:16" (1/1) ... [2023-11-21 19:49:16,403 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 07:49:16" (1/1) ... [2023-11-21 19:49:16,407 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 07:49:16" (1/1) ... [2023-11-21 19:49:16,409 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 07:49:16" (1/1) ... [2023-11-21 19:49:16,411 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 07:49:16" (1/1) ... [2023-11-21 19:49:16,415 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-11-21 19:49:16,416 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-11-21 19:49:16,417 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-11-21 19:49:16,417 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-11-21 19:49:16,418 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 07:49:16" (1/1) ... [2023-11-21 19:49:16,425 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-21 19:49:16,441 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2532c692-1d00-4804-a28e-ab6a707b70b0/bin/utaipan-verify-QoSU8krkJ5/z3 [2023-11-21 19:49:16,454 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2532c692-1d00-4804-a28e-ab6a707b70b0/bin/utaipan-verify-QoSU8krkJ5/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-11-21 19:49:16,469 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2532c692-1d00-4804-a28e-ab6a707b70b0/bin/utaipan-verify-QoSU8krkJ5/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-11-21 19:49:16,493 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-11-21 19:49:16,493 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-11-21 19:49:16,493 INFO L130 BoogieDeclarations]: Found specification of procedure node_create [2023-11-21 19:49:16,493 INFO L138 BoogieDeclarations]: Found implementation of procedure node_create [2023-11-21 19:49:16,493 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2023-11-21 19:49:16,494 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-11-21 19:49:16,494 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2023-11-21 19:49:16,494 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2023-11-21 19:49:16,494 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2023-11-21 19:49:16,495 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-11-21 19:49:16,495 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~$Pointer$ [2023-11-21 19:49:16,495 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-11-21 19:49:16,495 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-11-21 19:49:16,495 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-11-21 19:49:16,644 INFO L240 CfgBuilder]: Building ICFG [2023-11-21 19:49:16,646 INFO L266 CfgBuilder]: Building CFG for each procedure with an implementation [2023-11-21 19:49:16,871 INFO L281 CfgBuilder]: Performing block encoding [2023-11-21 19:49:16,981 INFO L303 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-11-21 19:49:16,981 INFO L308 CfgBuilder]: Removed 3 assume(true) statements. [2023-11-21 19:49:16,983 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.11 07:49:16 BoogieIcfgContainer [2023-11-21 19:49:16,983 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-11-21 19:49:16,987 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-11-21 19:49:16,988 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-11-21 19:49:16,992 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-11-21 19:49:16,992 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.11 07:49:15" (1/3) ... [2023-11-21 19:49:16,993 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3df73179 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.11 07:49:16, skipping insertion in model container [2023-11-21 19:49:16,994 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 07:49:16" (2/3) ... [2023-11-21 19:49:16,995 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@3df73179 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.11 07:49:16, skipping insertion in model container [2023-11-21 19:49:16,995 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.11 07:49:16" (3/3) ... [2023-11-21 19:49:16,996 INFO L112 eAbstractionObserver]: Analyzing ICFG sll2n_prepend_unequal.i [2023-11-21 19:49:17,017 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-11-21 19:49:17,018 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-11-21 19:49:17,077 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-11-21 19:49:17,084 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;@22ab11ae, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-11-21 19:49:17,085 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-11-21 19:49:17,090 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) [2023-11-21 19:49:17,100 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2023-11-21 19:49:17,100 INFO L187 NwaCegarLoop]: Found error trace [2023-11-21 19:49:17,101 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-21 19:49:17,102 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-21 19:49:17,110 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 19:49:17,110 INFO L85 PathProgramCache]: Analyzing trace with hash -1916200983, now seen corresponding path program 1 times [2023-11-21 19:49:17,121 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-21 19:49:17,122 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [988930464] [2023-11-21 19:49:17,122 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:49:17,122 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 19:49:17,312 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 19:49:17,548 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-21 19:49:17,548 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-21 19:49:17,549 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [988930464] [2023-11-21 19:49:17,550 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [988930464] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-21 19:49:17,550 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-21 19:49:17,551 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-11-21 19:49:17,553 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [884569099] [2023-11-21 19:49:17,554 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-21 19:49:17,559 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-21 19:49:17,560 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-21 19:49:17,643 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-21 19:49:17,645 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-21 19:49:17,648 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) [2023-11-21 19:49:17,759 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-21 19:49:17,760 INFO L93 Difference]: Finished difference Result 37 states and 51 transitions. [2023-11-21 19:49:17,762 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-21 19:49:17,764 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 [2023-11-21 19:49:17,764 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-21 19:49:17,772 INFO L225 Difference]: With dead ends: 37 [2023-11-21 19:49:17,772 INFO L226 Difference]: Without dead ends: 18 [2023-11-21 19:49:17,776 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 [2023-11-21 19:49:17,782 INFO L413 NwaCegarLoop]: 16 mSDtfsCounter, 1 mSDsluCounter, 16 mSDsCounter, 0 mSdLazyCounter, 17 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s 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, 0.1s IncrementalHoareTripleChecker+Time [2023-11-21 19:49:17,783 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [2 Valid, 32 Invalid, 17 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 17 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-21 19:49:17,803 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 18 states. [2023-11-21 19:49:17,824 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 18 to 16. [2023-11-21 19:49:17,826 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) [2023-11-21 19:49:17,828 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 20 transitions. [2023-11-21 19:49:17,829 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 20 transitions. Word has length 9 [2023-11-21 19:49:17,830 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-21 19:49:17,830 INFO L495 AbstractCegarLoop]: Abstraction has 16 states and 20 transitions. [2023-11-21 19:49:17,831 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) [2023-11-21 19:49:17,831 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 20 transitions. [2023-11-21 19:49:17,833 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2023-11-21 19:49:17,833 INFO L187 NwaCegarLoop]: Found error trace [2023-11-21 19:49:17,834 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-21 19:49:17,834 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-11-21 19:49:17,835 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-21 19:49:17,836 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 19:49:17,836 INFO L85 PathProgramCache]: Analyzing trace with hash -2126188791, now seen corresponding path program 1 times [2023-11-21 19:49:17,837 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-21 19:49:17,837 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [665716405] [2023-11-21 19:49:17,837 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:49:17,837 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 19:49:17,920 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 19:49:18,050 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-11-21 19:49:18,050 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-21 19:49:18,051 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [665716405] [2023-11-21 19:49:18,051 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [665716405] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-21 19:49:18,051 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1893427633] [2023-11-21 19:49:18,051 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:49:18,052 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 19:49:18,052 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2532c692-1d00-4804-a28e-ab6a707b70b0/bin/utaipan-verify-QoSU8krkJ5/z3 [2023-11-21 19:49:18,054 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2532c692-1d00-4804-a28e-ab6a707b70b0/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-21 19:49:18,071 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2532c692-1d00-4804-a28e-ab6a707b70b0/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-11-21 19:49:18,266 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 19:49:18,271 INFO L262 TraceCheckSpWp]: Trace formula consists of 231 conjuncts, 5 conjunts are in the unsatisfiable core [2023-11-21 19:49:18,278 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-21 19:49:18,353 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 3 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-21 19:49:18,354 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-21 19:49:18,393 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-11-21 19:49:18,394 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1893427633] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-21 19:49:18,394 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1184569817] [2023-11-21 19:49:18,419 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2023-11-21 19:49:18,419 INFO L166 IcfgInterpreter]: Building call graph [2023-11-21 19:49:18,423 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-21 19:49:18,430 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-21 19:49:18,431 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-21 19:49:21,107 INFO L197 IcfgInterpreter]: Interpreting procedure node_create with input of size 139 for LOIs [2023-11-21 19:49:21,493 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-21 19:49:28,359 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '185#(and (= |ULTIMATE.start_main_~uneq~0#1| 5) (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_ULTIMATE.start_sll_prepend_~head#1.base_14| Int) (|v_ULTIMATE.start_sll_prepend_#in~head#1.base_11| Int) (|v_#memory_int_26| (Array Int (Array Int Int)))) (and (= |v_#memory_int_26| (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_26| (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_int| (store |v_#memory_int_26| |v_ULTIMATE.start_sll_prepend_~head#1.base_14| (store (select |v_#memory_int_26| |v_ULTIMATE.start_sll_prepend_~head#1.base_14|) 0 (select (select |#memory_int| |v_ULTIMATE.start_sll_prepend_~head#1.base_14|) 0)))) (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_#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_#memory_int_38| (Array Int (Array Int Int))) (|v_#memory_int_60| (Array Int (Array Int Int)))) (and (= |v_#memory_int_64| (store |v_#memory_int_38| (select (select |#memory_$Pointer$.base| |v_ULTIMATE.start_sll_prepend_~head#1.base_14|) 0) (store (select |v_#memory_int_38| (select (select |#memory_$Pointer$.base| |v_ULTIMATE.start_sll_prepend_~head#1.base_14|) 0)) 0 5))) (= |v_#memory_int_38| (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_38| (select (select |#memory_$Pointer$.base| |v_ULTIMATE.start_sll_prepend_~head#1.base_14|) 0)) 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)) (= |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_#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_38| (Array Int (Array Int Int))) (|v_#memory_int_60| (Array Int (Array Int Int)))) (and (= |v_#memory_int_64| (store |v_#memory_int_38| (select (select |#memory_$Pointer$.base| |v_ULTIMATE.start_sll_prepend_~head#1.base_14|) 0) (store (select |v_#memory_int_38| (select (select |#memory_$Pointer$.base| |v_ULTIMATE.start_sll_prepend_~head#1.base_14|) 0)) 0 5))) (= |v_#memory_int_38| (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_38| (select (select |#memory_$Pointer$.base| |v_ULTIMATE.start_sll_prepend_~head#1.base_14|) 0)) 4)))))) (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)) (= |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_$Pointer$.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_$Pointer$.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) (= (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 [2023-11-21 19:49:28,360 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-21 19:49:28,360 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-21 19:49:28,360 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 5 [2023-11-21 19:49:28,361 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1644458045] [2023-11-21 19:49:28,361 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-21 19:49:28,362 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-11-21 19:49:28,363 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-21 19:49:28,363 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-11-21 19:49:28,364 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=177, Unknown=1, NotChecked=0, Total=210 [2023-11-21 19:49:28,365 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) [2023-11-21 19:49:28,414 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-21 19:49:28,415 INFO L93 Difference]: Finished difference Result 30 states and 38 transitions. [2023-11-21 19:49:28,415 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-11-21 19:49:28,415 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 [2023-11-21 19:49:28,416 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-21 19:49:28,416 INFO L225 Difference]: With dead ends: 30 [2023-11-21 19:49:28,417 INFO L226 Difference]: Without dead ends: 19 [2023-11-21 19:49:28,418 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 47 GetRequests, 32 SyntacticMatches, 2 SemanticMatches, 13 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 37 ImplicationChecksByTransitivity, 6.9s TimeCoverageRelationStatistics Valid=32, Invalid=177, Unknown=1, NotChecked=0, Total=210 [2023-11-21 19:49:28,420 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 [2023-11-21 19:49:28,420 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] [2023-11-21 19:49:28,421 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2023-11-21 19:49:28,425 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2023-11-21 19:49:28,425 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) [2023-11-21 19:49:28,426 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 24 transitions. [2023-11-21 19:49:28,427 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 24 transitions. Word has length 15 [2023-11-21 19:49:28,427 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-21 19:49:28,427 INFO L495 AbstractCegarLoop]: Abstraction has 19 states and 24 transitions. [2023-11-21 19:49:28,428 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) [2023-11-21 19:49:28,428 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 24 transitions. [2023-11-21 19:49:28,429 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 22 [2023-11-21 19:49:28,429 INFO L187 NwaCegarLoop]: Found error trace [2023-11-21 19:49:28,429 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1] [2023-11-21 19:49:28,455 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2532c692-1d00-4804-a28e-ab6a707b70b0/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-11-21 19:49:28,650 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2532c692-1d00-4804-a28e-ab6a707b70b0/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 19:49:28,650 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-21 19:49:28,651 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 19:49:28,651 INFO L85 PathProgramCache]: Analyzing trace with hash -1526010327, now seen corresponding path program 2 times [2023-11-21 19:49:28,651 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-21 19:49:28,652 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [180140207] [2023-11-21 19:49:28,652 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:49:28,652 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 19:49:28,745 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 19:49:29,692 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 10 trivial. 0 not checked. [2023-11-21 19:49:29,693 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-21 19:49:29,693 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [180140207] [2023-11-21 19:49:29,694 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [180140207] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-21 19:49:29,696 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-21 19:49:29,696 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2023-11-21 19:49:29,697 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [244178687] [2023-11-21 19:49:29,697 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-21 19:49:29,698 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2023-11-21 19:49:29,698 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-21 19:49:29,699 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2023-11-21 19:49:29,700 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=14, Invalid=42, Unknown=0, NotChecked=0, Total=56 [2023-11-21 19:49:29,701 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) [2023-11-21 19:49:29,851 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-21 19:49:29,852 INFO L93 Difference]: Finished difference Result 21 states and 25 transitions. [2023-11-21 19:49:29,853 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2023-11-21 19:49:29,853 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 [2023-11-21 19:49:29,854 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-21 19:49:29,854 INFO L225 Difference]: With dead ends: 21 [2023-11-21 19:49:29,855 INFO L226 Difference]: Without dead ends: 19 [2023-11-21 19:49:29,856 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 11 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 8 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=27, Invalid=83, Unknown=0, NotChecked=0, Total=110 [2023-11-21 19:49:29,860 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 [2023-11-21 19:49:29,862 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] [2023-11-21 19:49:29,863 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2023-11-21 19:49:29,869 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 19. [2023-11-21 19:49:29,869 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) [2023-11-21 19:49:29,870 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 19 states to 19 states and 23 transitions. [2023-11-21 19:49:29,870 INFO L78 Accepts]: Start accepts. Automaton has 19 states and 23 transitions. Word has length 21 [2023-11-21 19:49:29,871 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-21 19:49:29,871 INFO L495 AbstractCegarLoop]: Abstraction has 19 states and 23 transitions. [2023-11-21 19:49:29,872 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) [2023-11-21 19:49:29,872 INFO L276 IsEmpty]: Start isEmpty. Operand 19 states and 23 transitions. [2023-11-21 19:49:29,874 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2023-11-21 19:49:29,874 INFO L187 NwaCegarLoop]: Found error trace [2023-11-21 19:49:29,874 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-21 19:49:29,874 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2023-11-21 19:49:29,875 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-21 19:49:29,875 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 19:49:29,875 INFO L85 PathProgramCache]: Analyzing trace with hash -1912042300, now seen corresponding path program 1 times [2023-11-21 19:49:29,876 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-21 19:49:29,876 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [810337982] [2023-11-21 19:49:29,876 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:49:29,876 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 19:49:29,961 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 19:49:32,023 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 6 proven. 5 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-11-21 19:49:32,023 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-21 19:49:32,024 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [810337982] [2023-11-21 19:49:32,024 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [810337982] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-21 19:49:32,024 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1615058167] [2023-11-21 19:49:32,024 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:49:32,025 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 19:49:32,025 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2532c692-1d00-4804-a28e-ab6a707b70b0/bin/utaipan-verify-QoSU8krkJ5/z3 [2023-11-21 19:49:32,035 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2532c692-1d00-4804-a28e-ab6a707b70b0/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-21 19:49:32,036 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2532c692-1d00-4804-a28e-ab6a707b70b0/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-11-21 19:49:32,187 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 19:49:32,191 INFO L262 TraceCheckSpWp]: Trace formula consists of 324 conjuncts, 99 conjunts are in the unsatisfiable core [2023-11-21 19:49:32,197 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-21 19:49:32,321 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 [2023-11-21 19:49:32,342 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 [2023-11-21 19:49:32,444 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 [2023-11-21 19:49:32,637 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 [2023-11-21 19:49:32,644 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 [2023-11-21 19:49:32,650 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 [2023-11-21 19:49:32,657 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 [2023-11-21 19:49:32,831 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-21 19:49:32,832 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 [2023-11-21 19:49:32,842 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-21 19:49:32,844 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 [2023-11-21 19:49:32,872 INFO L349 Elim1Store]: treesize reduction 21, result has 44.7 percent of original size [2023-11-21 19:49:32,872 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 [2023-11-21 19:49:32,899 INFO L349 Elim1Store]: treesize reduction 4, result has 66.7 percent of original size [2023-11-21 19:49:32,899 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 [2023-11-21 19:49:33,011 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-21 19:49:33,013 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-21 19:49:33,014 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 [2023-11-21 19:49:33,025 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-21 19:49:33,029 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 100 treesize of output 38 [2023-11-21 19:49:33,050 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-21 19:49:33,056 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 67 treesize of output 21 [2023-11-21 19:49:33,207 INFO L349 Elim1Store]: treesize reduction 17, result has 5.6 percent of original size [2023-11-21 19:49:33,208 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 106 treesize of output 41 [2023-11-21 19:49:33,216 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-21 19:49:33,218 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 2 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 0 case distinctions, treesize of input 13 treesize of output 9 [2023-11-21 19:49:33,312 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 6 proven. 5 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-11-21 19:49:33,312 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-21 19:49:33,423 WARN L854 $PredicateComparison]: unable to prove that (forall ((|ULTIMATE.start_sll_prepend_#t~ret7#1.offset| Int) (v_ArrVal_313 (Array Int Int)) (v_ArrVal_312 (Array Int Int))) (= |c_ULTIMATE.start_main_~data~0#1| (let ((.cse5 (+ |ULTIMATE.start_sll_prepend_#t~ret7#1.offset| 4))) (let ((.cse3 (let ((.cse6 (store |c_#memory_$Pointer$.offset| |c_ULTIMATE.start_sll_prepend_#t~ret7#1.base| (store (select |c_#memory_$Pointer$.offset| |c_ULTIMATE.start_sll_prepend_#t~ret7#1.base|) .cse5 (select (select |c_#memory_$Pointer$.offset| |c_ULTIMATE.start_sll_prepend_~head#1.base|) |c_ULTIMATE.start_sll_prepend_~head#1.offset|))))) (store .cse6 |c_ULTIMATE.start_sll_prepend_~head#1.base| (store (select .cse6 |c_ULTIMATE.start_sll_prepend_~head#1.base|) |c_ULTIMATE.start_sll_prepend_~head#1.offset| |ULTIMATE.start_sll_prepend_#t~ret7#1.offset|)))) (.cse0 (let ((.cse4 (store |c_#memory_$Pointer$.base| |c_ULTIMATE.start_sll_prepend_#t~ret7#1.base| (store (select |c_#memory_$Pointer$.base| |c_ULTIMATE.start_sll_prepend_#t~ret7#1.base|) .cse5 (select (select |c_#memory_$Pointer$.base| |c_ULTIMATE.start_sll_prepend_~head#1.base|) |c_ULTIMATE.start_sll_prepend_~head#1.offset|))))) (store .cse4 |c_ULTIMATE.start_sll_prepend_~head#1.base| (store (select .cse4 |c_ULTIMATE.start_sll_prepend_~head#1.base|) |c_ULTIMATE.start_sll_prepend_~head#1.offset| |c_ULTIMATE.start_sll_prepend_#t~ret7#1.base|))))) (let ((.cse1 (select (select .cse0 |c_ULTIMATE.start_main_~#s~0#1.base|) |c_ULTIMATE.start_main_~#s~0#1.offset|)) (.cse2 (+ (select (select .cse3 |c_ULTIMATE.start_main_~#s~0#1.base|) |c_ULTIMATE.start_main_~#s~0#1.offset|) 4))) (select (select (store (store |c_#memory_int| |c_ULTIMATE.start_sll_prepend_#t~ret7#1.base| v_ArrVal_313) |c_ULTIMATE.start_sll_prepend_~head#1.base| v_ArrVal_312) (select (select .cse0 .cse1) .cse2)) (select (select .cse3 .cse1) .cse2))))))) is different from false [2023-11-21 19:49:34,286 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1615058167] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-21 19:49:34,286 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1932446591] [2023-11-21 19:49:34,289 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-11-21 19:49:34,289 INFO L166 IcfgInterpreter]: Building call graph [2023-11-21 19:49:34,289 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-21 19:49:34,289 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-21 19:49:34,290 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-21 19:49:35,931 INFO L197 IcfgInterpreter]: Interpreting procedure node_create with input of size 139 for LOIs [2023-11-21 19:49:36,222 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-21 19:50:01,879 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '445#(and (<= 1 |#StackHeapBarrier|) (not (= (select (select |#memory_int| |ULTIMATE.start_main_~ptr~0#1.base|) |ULTIMATE.start_main_~ptr~0#1.offset|) 1)) (= |ULTIMATE.start_main_~count~0#1| 1) (= |ULTIMATE.start_main_~uneq~0#1| 5) (or (not (= |ULTIMATE.start_main_~ptr~0#1.base| 0)) (not (= |ULTIMATE.start_main_~ptr~0#1.offset| 0))) (= |ULTIMATE.start_main_~temp~2#1.base| (select (select |#memory_$Pointer$.base| |ULTIMATE.start_main_~ptr~0#1.base|) (+ |ULTIMATE.start_main_~ptr~0#1.offset| 4))) (exists ((|v_#memory_int_96| (Array Int (Array Int Int))) (|v_ULTIMATE.start_sll_prepend_#in~head#1.base_13| Int) (|v_ULTIMATE.start_sll_prepend_~head#1.base_16| Int) (|v_#memory_$Pointer$.offset_68| (Array Int (Array Int Int))) (|v_#memory_int_26| (Array Int (Array Int Int))) (|v_#memory_$Pointer$.base_68| (Array Int (Array Int Int)))) (and (= |#memory_int| (store |v_#memory_int_26| |v_ULTIMATE.start_sll_prepend_~head#1.base_16| (store (select |v_#memory_int_26| |v_ULTIMATE.start_sll_prepend_~head#1.base_16|) 0 (select (select |#memory_int| |v_ULTIMATE.start_sll_prepend_~head#1.base_16|) 0)))) (= |#memory_$Pointer$.offset| (store (store |v_#memory_$Pointer$.offset_68| (select (select |#memory_$Pointer$.base| |v_ULTIMATE.start_sll_prepend_~head#1.base_16|) 0) (store (select |v_#memory_$Pointer$.offset_68| (select (select |#memory_$Pointer$.base| |v_ULTIMATE.start_sll_prepend_~head#1.base_16|) 0)) 4 (select (select |v_#memory_$Pointer$.offset_68| |v_ULTIMATE.start_sll_prepend_~head#1.base_16|) 0))) |v_ULTIMATE.start_sll_prepend_~head#1.base_16| (store (select (store |v_#memory_$Pointer$.offset_68| (select (select |#memory_$Pointer$.base| |v_ULTIMATE.start_sll_prepend_~head#1.base_16|) 0) (store (select |v_#memory_$Pointer$.offset_68| (select (select |#memory_$Pointer$.base| |v_ULTIMATE.start_sll_prepend_~head#1.base_16|) 0)) 4 (select (select |v_#memory_$Pointer$.offset_68| |v_ULTIMATE.start_sll_prepend_~head#1.base_16|) 0))) |v_ULTIMATE.start_sll_prepend_~head#1.base_16|) 0 0))) (= (store |v_#memory_int_96| (select (select |#memory_$Pointer$.base| |v_ULTIMATE.start_sll_prepend_~head#1.base_16|) 0) (store (select |v_#memory_int_96| (select (select |#memory_$Pointer$.base| |v_ULTIMATE.start_sll_prepend_~head#1.base_16|) 0)) 4 (select (select |v_#memory_int_26| (select (select |#memory_$Pointer$.base| |v_ULTIMATE.start_sll_prepend_~head#1.base_16|) 0)) 4))) |v_#memory_int_26|) (or (and (= |v_ULTIMATE.start_sll_prepend_~head#1.base_16| |v_ULTIMATE.start_sll_prepend_#in~head#1.base_13|) (exists ((|v_old(#memory_$Pointer$.base)_AFTER_CALL_21| (Array Int (Array Int Int))) (|v_#memory_$Pointer$.base_67| (Array Int (Array Int Int)))) (and (= (store |v_#memory_$Pointer$.base_67| |ULTIMATE.start_sll_create_#res#1.base| (store (select |v_#memory_$Pointer$.base_67| |ULTIMATE.start_sll_create_#res#1.base|) 4 (select (select |v_old(#memory_$Pointer$.base)_AFTER_CALL_21| |ULTIMATE.start_sll_create_#res#1.base|) 4))) |v_old(#memory_$Pointer$.base)_AFTER_CALL_21|) (= (select (select |v_old(#memory_$Pointer$.base)_AFTER_CALL_21| |ULTIMATE.start_main_~#s~0#1.base|) 0) |ULTIMATE.start_sll_create_#res#1.base|))) (exists ((|v_#memory_int_95| (Array Int (Array Int Int))) (|v_old(#memory_int)_AFTER_CALL_21| (Array Int (Array Int Int)))) (= |v_old(#memory_int)_AFTER_CALL_21| (store |v_#memory_int_95| |ULTIMATE.start_sll_create_#res#1.base| (store (select |v_#memory_int_95| |ULTIMATE.start_sll_create_#res#1.base|) 4 (select (select |v_old(#memory_int)_AFTER_CALL_21| |ULTIMATE.start_sll_create_#res#1.base|) 4))))) (<= (+ (select (select |#memory_$Pointer$.base| |v_ULTIMATE.start_sll_prepend_~head#1.base_16|) 0) 1) |#StackHeapBarrier|) (not (= (select (select |#memory_$Pointer$.base| |v_ULTIMATE.start_sll_prepend_~head#1.base_16|) 0) 0)) (exists ((|v_#length_30| (Array Int Int))) (= (store |v_#length_30| (select (select |#memory_$Pointer$.base| |v_ULTIMATE.start_sll_prepend_~head#1.base_16|) 0) 8) |#length|)) (exists ((|v_#memory_$Pointer$.base_64| (Array Int (Array Int Int)))) (= (store |v_#memory_$Pointer$.base_64| (select (select |#memory_$Pointer$.base| |v_ULTIMATE.start_sll_prepend_~head#1.base_16|) 0) (store (store (select |v_#memory_$Pointer$.base_64| (select (select |#memory_$Pointer$.base| |v_ULTIMATE.start_sll_prepend_~head#1.base_16|) 0)) 4 0) 0 (select (select |v_#memory_$Pointer$.base_68| (select (select |#memory_$Pointer$.base| |v_ULTIMATE.start_sll_prepend_~head#1.base_16|) 0)) 0))) |v_#memory_$Pointer$.base_68|)) (exists ((|v_#memory_int_38| (Array Int (Array Int Int))) (|v_#memory_int_92| (Array Int (Array Int Int)))) (and (= |v_#memory_int_38| (store |v_#memory_int_92| (select (select |#memory_$Pointer$.base| |v_ULTIMATE.start_sll_prepend_~head#1.base_16|) 0) (store (select |v_#memory_int_92| (select (select |#memory_$Pointer$.base| |v_ULTIMATE.start_sll_prepend_~head#1.base_16|) 0)) 4 (select (select |v_#memory_int_38| (select (select |#memory_$Pointer$.base| |v_ULTIMATE.start_sll_prepend_~head#1.base_16|) 0)) 4)))) (= |v_#memory_int_96| (store |v_#memory_int_38| (select (select |#memory_$Pointer$.base| |v_ULTIMATE.start_sll_prepend_~head#1.base_16|) 0) (store (select |v_#memory_int_38| (select (select |#memory_$Pointer$.base| |v_ULTIMATE.start_sll_prepend_~head#1.base_16|) 0)) 0 5))))) (exists ((|v_#memory_$Pointer$.offset_67| (Array Int (Array Int Int)))) (= (select (select (store |v_#memory_$Pointer$.offset_67| |ULTIMATE.start_sll_create_#res#1.base| (store (select |v_#memory_$Pointer$.offset_67| |ULTIMATE.start_sll_create_#res#1.base|) 4 0)) |ULTIMATE.start_main_~#s~0#1.base|) 0) 0)) (exists ((|v_#valid_43| (Array Int Int))) (and (= (select |v_#valid_43| (select (select |#memory_$Pointer$.base| |v_ULTIMATE.start_sll_prepend_~head#1.base_16|) 0)) 0) (= (store |v_#valid_43| (select (select |#memory_$Pointer$.base| |v_ULTIMATE.start_sll_prepend_~head#1.base_16|) 0) 1) |#valid|))) (exists ((|v_#memory_$Pointer$.offset_64| (Array Int (Array Int Int)))) (= (store |v_#memory_$Pointer$.offset_64| (select (select |#memory_$Pointer$.base| |v_ULTIMATE.start_sll_prepend_~head#1.base_16|) 0) (store (store (select |v_#memory_$Pointer$.offset_64| (select (select |#memory_$Pointer$.base| |v_ULTIMATE.start_sll_prepend_~head#1.base_16|) 0)) 4 0) 0 (select (select |v_#memory_$Pointer$.offset_68| (select (select |#memory_$Pointer$.base| |v_ULTIMATE.start_sll_prepend_~head#1.base_16|) 0)) 0))) |v_#memory_$Pointer$.offset_68|)) (= |v_ULTIMATE.start_sll_prepend_#in~head#1.base_13| |ULTIMATE.start_main_~#s~0#1.base|)) (and (exists ((|v_#memory_int_95| (Array Int (Array Int Int))) (|v_old(#memory_int)_AFTER_CALL_20| (Array Int (Array Int Int)))) (= |v_old(#memory_int)_AFTER_CALL_20| (store |v_#memory_int_95| |ULTIMATE.start_sll_create_#res#1.base| (store (select |v_#memory_int_95| |ULTIMATE.start_sll_create_#res#1.base|) 4 (select (select |v_old(#memory_int)_AFTER_CALL_20| |ULTIMATE.start_sll_create_#res#1.base|) 4))))) (= |v_ULTIMATE.start_sll_prepend_~head#1.base_16| |v_ULTIMATE.start_sll_prepend_#in~head#1.base_13|) (<= (+ (select (select |#memory_$Pointer$.base| |v_ULTIMATE.start_sll_prepend_~head#1.base_16|) 0) 1) |#StackHeapBarrier|) (not (= (select (select |#memory_$Pointer$.base| |v_ULTIMATE.start_sll_prepend_~head#1.base_16|) 0) 0)) (exists ((|v_#length_30| (Array Int Int))) (= (store |v_#length_30| (select (select |#memory_$Pointer$.base| |v_ULTIMATE.start_sll_prepend_~head#1.base_16|) 0) 8) |#length|)) (exists ((|v_#memory_$Pointer$.base_64| (Array Int (Array Int Int)))) (= (store |v_#memory_$Pointer$.base_64| (select (select |#memory_$Pointer$.base| |v_ULTIMATE.start_sll_prepend_~head#1.base_16|) 0) (store (store (select |v_#memory_$Pointer$.base_64| (select (select |#memory_$Pointer$.base| |v_ULTIMATE.start_sll_prepend_~head#1.base_16|) 0)) 4 0) 0 (select (select |v_#memory_$Pointer$.base_68| (select (select |#memory_$Pointer$.base| |v_ULTIMATE.start_sll_prepend_~head#1.base_16|) 0)) 0))) |v_#memory_$Pointer$.base_68|)) (exists ((|v_#memory_int_38| (Array Int (Array Int Int))) (|v_#memory_int_92| (Array Int (Array Int Int)))) (and (= |v_#memory_int_38| (store |v_#memory_int_92| (select (select |#memory_$Pointer$.base| |v_ULTIMATE.start_sll_prepend_~head#1.base_16|) 0) (store (select |v_#memory_int_92| (select (select |#memory_$Pointer$.base| |v_ULTIMATE.start_sll_prepend_~head#1.base_16|) 0)) 4 (select (select |v_#memory_int_38| (select (select |#memory_$Pointer$.base| |v_ULTIMATE.start_sll_prepend_~head#1.base_16|) 0)) 4)))) (= |v_#memory_int_96| (store |v_#memory_int_38| (select (select |#memory_$Pointer$.base| |v_ULTIMATE.start_sll_prepend_~head#1.base_16|) 0) (store (select |v_#memory_int_38| (select (select |#memory_$Pointer$.base| |v_ULTIMATE.start_sll_prepend_~head#1.base_16|) 0)) 0 5))))) (exists ((|v_#memory_$Pointer$.offset_67| (Array Int (Array Int Int)))) (= (select (select (store |v_#memory_$Pointer$.offset_67| |ULTIMATE.start_sll_create_#res#1.base| (store (select |v_#memory_$Pointer$.offset_67| |ULTIMATE.start_sll_create_#res#1.base|) 4 0)) |ULTIMATE.start_main_~#s~0#1.base|) 0) 0)) (exists ((|v_#valid_43| (Array Int Int))) (and (= (select |v_#valid_43| (select (select |#memory_$Pointer$.base| |v_ULTIMATE.start_sll_prepend_~head#1.base_16|) 0)) 0) (= (store |v_#valid_43| (select (select |#memory_$Pointer$.base| |v_ULTIMATE.start_sll_prepend_~head#1.base_16|) 0) 1) |#valid|))) (exists ((|v_old(#memory_$Pointer$.base)_AFTER_CALL_20| (Array Int (Array Int Int))) (|v_#memory_$Pointer$.base_67| (Array Int (Array Int Int)))) (and (= |v_old(#memory_$Pointer$.base)_AFTER_CALL_20| (store |v_#memory_$Pointer$.base_67| |ULTIMATE.start_sll_create_#res#1.base| (store (select |v_#memory_$Pointer$.base_67| |ULTIMATE.start_sll_create_#res#1.base|) 4 (select (select |v_old(#memory_$Pointer$.base)_AFTER_CALL_20| |ULTIMATE.start_sll_create_#res#1.base|) 4)))) (= (select (select |v_old(#memory_$Pointer$.base)_AFTER_CALL_20| |ULTIMATE.start_main_~#s~0#1.base|) 0) |ULTIMATE.start_sll_create_#res#1.base|))) (exists ((|v_#memory_$Pointer$.offset_64| (Array Int (Array Int Int)))) (= (store |v_#memory_$Pointer$.offset_64| (select (select |#memory_$Pointer$.base| |v_ULTIMATE.start_sll_prepend_~head#1.base_16|) 0) (store (store (select |v_#memory_$Pointer$.offset_64| (select (select |#memory_$Pointer$.base| |v_ULTIMATE.start_sll_prepend_~head#1.base_16|) 0)) 4 0) 0 (select (select |v_#memory_$Pointer$.offset_68| (select (select |#memory_$Pointer$.base| |v_ULTIMATE.start_sll_prepend_~head#1.base_16|) 0)) 0))) |v_#memory_$Pointer$.offset_68|)) (= |v_ULTIMATE.start_sll_prepend_#in~head#1.base_13| |ULTIMATE.start_main_~#s~0#1.base|))) (= |#memory_$Pointer$.base| (store (store |v_#memory_$Pointer$.base_68| (select (select |#memory_$Pointer$.base| |v_ULTIMATE.start_sll_prepend_~head#1.base_16|) 0) (store (select |v_#memory_$Pointer$.base_68| (select (select |#memory_$Pointer$.base| |v_ULTIMATE.start_sll_prepend_~head#1.base_16|) 0)) 4 (select (select |v_#memory_$Pointer$.base_68| |v_ULTIMATE.start_sll_prepend_~head#1.base_16|) 0))) |v_ULTIMATE.start_sll_prepend_~head#1.base_16| (store (select (store |v_#memory_$Pointer$.base_68| (select (select |#memory_$Pointer$.base| |v_ULTIMATE.start_sll_prepend_~head#1.base_16|) 0) (store (select |v_#memory_$Pointer$.base_68| (select (select |#memory_$Pointer$.base| |v_ULTIMATE.start_sll_prepend_~head#1.base_16|) 0)) 4 (select (select |v_#memory_$Pointer$.base_68| |v_ULTIMATE.start_sll_prepend_~head#1.base_16|) 0))) |v_ULTIMATE.start_sll_prepend_~head#1.base_16|) 0 (select (select |#memory_$Pointer$.base| |v_ULTIMATE.start_sll_prepend_~head#1.base_16|) 0)))))) (= |ULTIMATE.start_sll_create_#res#1.offset| 0) (= |ULTIMATE.start_main_~ptr~0#1.offset| (select (select |#memory_$Pointer$.offset| (select (select |#memory_$Pointer$.base| |ULTIMATE.start_main_~#s~0#1.base|) 0)) (+ (select (select |#memory_$Pointer$.offset| |ULTIMATE.start_main_~#s~0#1.base|) 0) 4))) (= (select (select |#memory_$Pointer$.base| (select (select |#memory_$Pointer$.base| |ULTIMATE.start_main_~#s~0#1.base|) 0)) (+ (select (select |#memory_$Pointer$.offset| |ULTIMATE.start_main_~#s~0#1.base|) 0) 4)) |ULTIMATE.start_main_~ptr~0#1.base|) (= |ULTIMATE.start_main_~data~0#1| 1) (= 5 (select (select |#memory_int| (select (select |#memory_$Pointer$.base| |ULTIMATE.start_main_~#s~0#1.base|) 0)) (select (select |#memory_$Pointer$.offset| |ULTIMATE.start_main_~#s~0#1.base|) 0))) (= |ULTIMATE.start_main_~#s~0#1.offset| 0) (= |ULTIMATE.start_main_~len~0#1| 2) (= (select (select |#memory_$Pointer$.offset| |ULTIMATE.start_main_~ptr~0#1.base|) (+ |ULTIMATE.start_main_~ptr~0#1.offset| 4)) |ULTIMATE.start_main_~temp~2#1.offset|) (<= 2 |ULTIMATE.start_main_~#s~0#1.base|))' at error location [2023-11-21 19:50:01,879 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-21 19:50:01,879 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-11-21 19:50:01,879 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 15] total 25 [2023-11-21 19:50:01,880 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [372618557] [2023-11-21 19:50:01,880 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-11-21 19:50:01,880 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 25 states [2023-11-21 19:50:01,880 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-21 19:50:01,881 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 25 interpolants. [2023-11-21 19:50:01,882 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=97, Invalid=1386, Unknown=3, NotChecked=74, Total=1560 [2023-11-21 19:50:01,883 INFO L87 Difference]: Start difference. First operand 19 states and 23 transitions. Second operand has 25 states, 20 states have (on average 1.35) internal successors, (27), 20 states have internal predecessors, (27), 4 states have call successors, (4), 2 states have call predecessors, (4), 4 states have return successors, (6), 6 states have call predecessors, (6), 4 states have call successors, (6) [2023-11-21 19:50:03,531 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-21 19:50:03,531 INFO L93 Difference]: Finished difference Result 26 states and 30 transitions. [2023-11-21 19:50:03,531 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2023-11-21 19:50:03,532 INFO L78 Accepts]: Start accepts. Automaton has has 25 states, 20 states have (on average 1.35) internal successors, (27), 20 states have internal predecessors, (27), 4 states have call successors, (4), 2 states have call predecessors, (4), 4 states have return successors, (6), 6 states have call predecessors, (6), 4 states have call successors, (6) Word has length 23 [2023-11-21 19:50:03,532 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-21 19:50:03,533 INFO L225 Difference]: With dead ends: 26 [2023-11-21 19:50:03,533 INFO L226 Difference]: Without dead ends: 24 [2023-11-21 19:50:03,535 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 73 GetRequests, 28 SyntacticMatches, 0 SemanticMatches, 45 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 276 ImplicationChecksByTransitivity, 28.4s TimeCoverageRelationStatistics Valid=137, Invalid=1934, Unknown=3, NotChecked=88, Total=2162 [2023-11-21 19:50:03,536 INFO L413 NwaCegarLoop]: 8 mSDtfsCounter, 11 mSDsluCounter, 77 mSDsCounter, 0 mSdLazyCounter, 262 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.6s Time, 0 mProtectedPredicate, 0 mProtectedAction, 11 SdHoareTripleChecker+Valid, 85 SdHoareTripleChecker+Invalid, 263 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 262 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2023-11-21 19:50:03,537 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [11 Valid, 85 Invalid, 263 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 262 Invalid, 0 Unknown, 0 Unchecked, 0.6s Time] [2023-11-21 19:50:03,538 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2023-11-21 19:50:03,543 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 21. [2023-11-21 19:50:03,543 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21 states, 16 states have (on average 1.25) internal successors, (20), 16 states have internal predecessors, (20), 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) [2023-11-21 19:50:03,544 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 26 transitions. [2023-11-21 19:50:03,545 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 26 transitions. Word has length 23 [2023-11-21 19:50:03,545 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-21 19:50:03,545 INFO L495 AbstractCegarLoop]: Abstraction has 21 states and 26 transitions. [2023-11-21 19:50:03,546 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 25 states, 20 states have (on average 1.35) internal successors, (27), 20 states have internal predecessors, (27), 4 states have call successors, (4), 2 states have call predecessors, (4), 4 states have return successors, (6), 6 states have call predecessors, (6), 4 states have call successors, (6) [2023-11-21 19:50:03,546 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 26 transitions. [2023-11-21 19:50:03,547 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2023-11-21 19:50:03,547 INFO L187 NwaCegarLoop]: Found error trace [2023-11-21 19:50:03,547 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-21 19:50:03,576 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2532c692-1d00-4804-a28e-ab6a707b70b0/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2023-11-21 19:50:03,770 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2532c692-1d00-4804-a28e-ab6a707b70b0/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 19:50:03,770 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-21 19:50:03,771 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 19:50:03,771 INFO L85 PathProgramCache]: Analyzing trace with hash -1911987275, now seen corresponding path program 1 times [2023-11-21 19:50:03,771 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-21 19:50:03,771 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1204149372] [2023-11-21 19:50:03,771 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:50:03,771 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 19:50:03,830 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 19:50:04,849 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 9 proven. 2 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-11-21 19:50:04,849 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-21 19:50:04,850 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1204149372] [2023-11-21 19:50:04,850 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1204149372] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-21 19:50:04,850 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1902703479] [2023-11-21 19:50:04,850 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:50:04,850 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 19:50:04,851 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2532c692-1d00-4804-a28e-ab6a707b70b0/bin/utaipan-verify-QoSU8krkJ5/z3 [2023-11-21 19:50:04,854 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2532c692-1d00-4804-a28e-ab6a707b70b0/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-21 19:50:04,860 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_2532c692-1d00-4804-a28e-ab6a707b70b0/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-11-21 19:50:05,016 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 19:50:05,019 INFO L262 TraceCheckSpWp]: Trace formula consists of 321 conjuncts, 47 conjunts are in the unsatisfiable core [2023-11-21 19:50:05,023 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-21 19:50:05,096 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 [2023-11-21 19:50:05,247 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-21 19:50:05,249 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 [2023-11-21 19:50:05,337 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-21 19:50:05,343 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-21 19:50:05,345 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 22 treesize of output 22 [2023-11-21 19:50:05,355 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-21 19:50:05,360 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 76 treesize of output 22 [2023-11-21 19:50:05,367 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 38 treesize of output 30 [2023-11-21 19:50:05,491 INFO L349 Elim1Store]: treesize reduction 13, result has 7.1 percent of original size [2023-11-21 19:50:05,492 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 3 new quantified variables, introduced 1 case distinctions, treesize of input 37 treesize of output 16 [2023-11-21 19:50:05,500 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 9 proven. 2 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-11-21 19:50:05,501 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-21 19:50:05,584 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-11-21 19:50:05,584 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 1194 treesize of output 1193 [2023-11-21 19:50:05,599 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 972 treesize of output 964 [2023-11-21 19:50:05,755 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 184 treesize of output 182 [2023-11-21 19:50:05,784 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 88 treesize of output 86 [2023-11-21 19:50:05,805 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 88 treesize of output 86 [2023-11-21 19:50:05,852 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 88 treesize of output 86 [2023-11-21 19:50:05,876 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 88 treesize of output 86