./Ultimate.py --spec ../../sv-benchmarks/c/properties/valid-memsafety.prp --file ../../sv-benchmarks/c/list-simple/sll2n_insert_equal.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for memory safety (deref-memtrack) Using default analysis Version 30e01a73 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_b170249e-d536-4a57-8bb5-88159e60dc08/bin/utaipan-verify-mE87zJ7Ire/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b170249e-d536-4a57-8bb5-88159e60dc08/bin/utaipan-verify-mE87zJ7Ire/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b170249e-d536-4a57-8bb5-88159e60dc08/bin/utaipan-verify-mE87zJ7Ire/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b170249e-d536-4a57-8bb5-88159e60dc08/bin/utaipan-verify-mE87zJ7Ire/config/TaipanMemDerefMemtrack.xml -i ../../sv-benchmarks/c/list-simple/sll2n_insert_equal.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b170249e-d536-4a57-8bb5-88159e60dc08/bin/utaipan-verify-mE87zJ7Ire/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b170249e-d536-4a57-8bb5-88159e60dc08/bin/utaipan-verify-mE87zJ7Ire --witnessprinter.witness.filename witness --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash 43bf83586090da08f52ccb7b612d2451c8f1efe9c820d873134ac51350c022e3 --- Real Ultimate output --- This is Ultimate 0.2.3-dev-30e01a7 [2023-11-23 21:08:27,510 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-11-23 21:08:27,651 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b170249e-d536-4a57-8bb5-88159e60dc08/bin/utaipan-verify-mE87zJ7Ire/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Default.epf [2023-11-23 21:08:27,662 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-11-23 21:08:27,663 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-11-23 21:08:27,710 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-11-23 21:08:27,711 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-11-23 21:08:27,712 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-11-23 21:08:27,713 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-11-23 21:08:27,716 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-11-23 21:08:27,716 INFO L153 SettingsManager]: * User list type=DISABLED [2023-11-23 21:08:27,717 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-11-23 21:08:27,718 INFO L153 SettingsManager]: * Explicit value domain=true [2023-11-23 21:08:27,718 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-11-23 21:08:27,719 INFO L153 SettingsManager]: * Octagon Domain=false [2023-11-23 21:08:27,720 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-11-23 21:08:27,722 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-11-23 21:08:27,724 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-11-23 21:08:27,724 INFO L153 SettingsManager]: * Interval Domain=false [2023-11-23 21:08:27,725 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-11-23 21:08:27,725 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-11-23 21:08:27,726 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2023-11-23 21:08:27,727 INFO L151 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2023-11-23 21:08:27,727 INFO L153 SettingsManager]: * Create parallel compositions if possible=false [2023-11-23 21:08:27,729 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-11-23 21:08:27,729 INFO L153 SettingsManager]: * sizeof long=4 [2023-11-23 21:08:27,730 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-11-23 21:08:27,730 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-11-23 21:08:27,731 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-11-23 21:08:27,731 INFO L153 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2023-11-23 21:08:27,732 INFO L153 SettingsManager]: * Bitprecise bitfields=true [2023-11-23 21:08:27,733 INFO L153 SettingsManager]: * SV-COMP memtrack compatibility mode=true [2023-11-23 21:08:27,733 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-11-23 21:08:27,733 INFO L153 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2023-11-23 21:08:27,734 INFO L153 SettingsManager]: * Check unreachability of reach_error function=false [2023-11-23 21:08:27,734 INFO L153 SettingsManager]: * sizeof long double=12 [2023-11-23 21:08:27,734 INFO L153 SettingsManager]: * Use constant arrays=true [2023-11-23 21:08:27,734 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-11-23 21:08:27,735 INFO L153 SettingsManager]: * Only consider context switches at boundaries of atomic blocks=true [2023-11-23 21:08:27,735 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-11-23 21:08:27,735 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-23 21:08:27,736 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-11-23 21:08:27,736 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-11-23 21:08:27,736 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-11-23 21:08:27,737 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-11-23 21:08:27,737 INFO L153 SettingsManager]: * Apply one-shot large block encoding in concurrent analysis=false [2023-11-23 21:08:27,737 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-11-23 21:08:27,738 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-11-23 21:08:27,738 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_b170249e-d536-4a57-8bb5-88159e60dc08/bin/utaipan-verify-mE87zJ7Ire/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b170249e-d536-4a57-8bb5-88159e60dc08/bin/utaipan-verify-mE87zJ7Ire Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 43bf83586090da08f52ccb7b612d2451c8f1efe9c820d873134ac51350c022e3 [2023-11-23 21:08:28,098 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-11-23 21:08:28,138 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-11-23 21:08:28,143 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-11-23 21:08:28,144 INFO L270 PluginConnector]: Initializing CDTParser... [2023-11-23 21:08:28,145 INFO L274 PluginConnector]: CDTParser initialized [2023-11-23 21:08:28,147 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b170249e-d536-4a57-8bb5-88159e60dc08/bin/utaipan-verify-mE87zJ7Ire/../../sv-benchmarks/c/list-simple/sll2n_insert_equal.i [2023-11-23 21:08:31,401 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-11-23 21:08:31,768 INFO L384 CDTParser]: Found 1 translation units. [2023-11-23 21:08:31,768 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b170249e-d536-4a57-8bb5-88159e60dc08/sv-benchmarks/c/list-simple/sll2n_insert_equal.i [2023-11-23 21:08:31,790 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b170249e-d536-4a57-8bb5-88159e60dc08/bin/utaipan-verify-mE87zJ7Ire/data/6839c2e23/51571080f8ac489dbef516532ba187ca/FLAGc8d1044ae [2023-11-23 21:08:31,808 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b170249e-d536-4a57-8bb5-88159e60dc08/bin/utaipan-verify-mE87zJ7Ire/data/6839c2e23/51571080f8ac489dbef516532ba187ca [2023-11-23 21:08:31,812 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-11-23 21:08:31,815 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-11-23 21:08:31,819 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-11-23 21:08:31,819 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-11-23 21:08:31,825 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-11-23 21:08:31,826 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 09:08:31" (1/1) ... [2023-11-23 21:08:31,827 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@7f4a847f and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:08:31, skipping insertion in model container [2023-11-23 21:08:31,828 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 09:08:31" (1/1) ... [2023-11-23 21:08:31,886 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-11-23 21:08:32,281 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-23 21:08:32,299 INFO L202 MainTranslator]: Completed pre-run [2023-11-23 21:08:32,363 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-23 21:08:32,404 INFO L206 MainTranslator]: Completed translation [2023-11-23 21:08:32,405 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:08:32 WrapperNode [2023-11-23 21:08:32,405 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-11-23 21:08:32,407 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-11-23 21:08:32,407 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-11-23 21:08:32,407 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-11-23 21:08:32,417 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:08:32" (1/1) ... [2023-11-23 21:08:32,431 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:08:32" (1/1) ... [2023-11-23 21:08:32,475 INFO L138 Inliner]: procedures = 127, calls = 33, calls flagged for inlining = 7, calls inlined = 7, statements flattened = 127 [2023-11-23 21:08:32,475 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-11-23 21:08:32,476 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-11-23 21:08:32,476 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-11-23 21:08:32,476 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-11-23 21:08:32,489 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:08:32" (1/1) ... [2023-11-23 21:08:32,489 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:08:32" (1/1) ... [2023-11-23 21:08:32,494 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:08:32" (1/1) ... [2023-11-23 21:08:32,494 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:08:32" (1/1) ... [2023-11-23 21:08:32,518 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:08:32" (1/1) ... [2023-11-23 21:08:32,522 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:08:32" (1/1) ... [2023-11-23 21:08:32,532 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:08:32" (1/1) ... [2023-11-23 21:08:32,534 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:08:32" (1/1) ... [2023-11-23 21:08:32,538 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-11-23 21:08:32,539 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-11-23 21:08:32,539 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-11-23 21:08:32,540 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-11-23 21:08:32,540 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:08:32" (1/1) ... [2023-11-23 21:08:32,554 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-23 21:08:32,575 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b170249e-d536-4a57-8bb5-88159e60dc08/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:08:32,593 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b170249e-d536-4a57-8bb5-88159e60dc08/bin/utaipan-verify-mE87zJ7Ire/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-11-23 21:08:32,650 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b170249e-d536-4a57-8bb5-88159e60dc08/bin/utaipan-verify-mE87zJ7Ire/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-11-23 21:08:32,710 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-11-23 21:08:32,711 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-11-23 21:08:32,711 INFO L130 BoogieDeclarations]: Found specification of procedure node_create [2023-11-23 21:08:32,711 INFO L138 BoogieDeclarations]: Found implementation of procedure node_create [2023-11-23 21:08:32,711 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2023-11-23 21:08:32,711 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-11-23 21:08:32,712 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2023-11-23 21:08:32,712 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2023-11-23 21:08:32,712 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2023-11-23 21:08:32,712 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-11-23 21:08:32,712 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~$Pointer$ [2023-11-23 21:08:32,713 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-11-23 21:08:32,713 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-11-23 21:08:32,713 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-11-23 21:08:32,860 INFO L241 CfgBuilder]: Building ICFG [2023-11-23 21:08:32,871 INFO L267 CfgBuilder]: Building CFG for each procedure with an implementation [2023-11-23 21:08:33,211 INFO L282 CfgBuilder]: Performing block encoding [2023-11-23 21:08:33,294 INFO L304 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-11-23 21:08:33,306 INFO L309 CfgBuilder]: Removed 4 assume(true) statements. [2023-11-23 21:08:33,308 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 09:08:33 BoogieIcfgContainer [2023-11-23 21:08:33,308 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-11-23 21:08:33,310 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-11-23 21:08:33,310 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-11-23 21:08:33,314 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-11-23 21:08:33,314 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.11 09:08:31" (1/3) ... [2023-11-23 21:08:33,315 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@15f2cb9e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 09:08:33, skipping insertion in model container [2023-11-23 21:08:33,315 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:08:32" (2/3) ... [2023-11-23 21:08:33,315 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@15f2cb9e and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 09:08:33, skipping insertion in model container [2023-11-23 21:08:33,315 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 09:08:33" (3/3) ... [2023-11-23 21:08:33,317 INFO L112 eAbstractionObserver]: Analyzing ICFG sll2n_insert_equal.i [2023-11-23 21:08:33,335 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-11-23 21:08:33,335 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 31 error locations. [2023-11-23 21:08:33,380 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-11-23 21:08:33,388 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=false, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=All, 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;@1e564b36, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-11-23 21:08:33,388 INFO L358 AbstractCegarLoop]: Starting to check reachability of 31 error locations. [2023-11-23 21:08:33,392 INFO L276 IsEmpty]: Start isEmpty. Operand has 69 states, 34 states have (on average 2.176470588235294) internal successors, (74), 65 states have internal predecessors, (74), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-11-23 21:08:33,398 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2023-11-23 21:08:33,398 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:08:33,399 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2023-11-23 21:08:33,400 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting node_createErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 28 more)] === [2023-11-23 21:08:33,404 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:08:33,405 INFO L85 PathProgramCache]: Analyzing trace with hash 1486501759, now seen corresponding path program 1 times [2023-11-23 21:08:33,413 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:08:33,414 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [537939814] [2023-11-23 21:08:33,415 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:08:33,415 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:08:33,587 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:08:33,825 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 21:08:33,826 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:08:33,826 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [537939814] [2023-11-23 21:08:33,827 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [537939814] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 21:08:33,827 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-23 21:08:33,828 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-11-23 21:08:33,829 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [205988820] [2023-11-23 21:08:33,830 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:08:33,837 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-23 21:08:33,839 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:08:33,875 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-23 21:08:33,878 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-23 21:08:33,881 INFO L87 Difference]: Start difference. First operand has 69 states, 34 states have (on average 2.176470588235294) internal successors, (74), 65 states have internal predecessors, (74), 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 1.6666666666666667) internal successors, (5), 2 states have internal predecessors, (5), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:08:33,990 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:08:33,991 INFO L93 Difference]: Finished difference Result 74 states and 82 transitions. [2023-11-23 21:08:33,992 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-23 21:08:33,994 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 1.6666666666666667) internal successors, (5), 2 states have internal predecessors, (5), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 6 [2023-11-23 21:08:33,994 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:08:34,004 INFO L225 Difference]: With dead ends: 74 [2023-11-23 21:08:34,005 INFO L226 Difference]: Without dead ends: 72 [2023-11-23 21:08:34,007 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-23 21:08:34,014 INFO L413 NwaCegarLoop]: 59 mSDtfsCounter, 4 mSDsluCounter, 57 mSDsCounter, 0 mSdLazyCounter, 33 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 116 SdHoareTripleChecker+Invalid, 33 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 33 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-23 21:08:34,015 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [5 Valid, 116 Invalid, 33 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 33 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-23 21:08:34,035 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 72 states. [2023-11-23 21:08:34,072 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 72 to 67. [2023-11-23 21:08:34,074 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 67 states, 33 states have (on average 2.090909090909091) internal successors, (69), 63 states have internal predecessors, (69), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-11-23 21:08:34,079 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 67 states to 67 states and 73 transitions. [2023-11-23 21:08:34,080 INFO L78 Accepts]: Start accepts. Automaton has 67 states and 73 transitions. Word has length 6 [2023-11-23 21:08:34,081 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:08:34,081 INFO L495 AbstractCegarLoop]: Abstraction has 67 states and 73 transitions. [2023-11-23 21:08:34,081 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 1.6666666666666667) internal successors, (5), 2 states have internal predecessors, (5), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:08:34,082 INFO L276 IsEmpty]: Start isEmpty. Operand 67 states and 73 transitions. [2023-11-23 21:08:34,082 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2023-11-23 21:08:34,082 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:08:34,083 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2023-11-23 21:08:34,083 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-11-23 21:08:34,084 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting node_createErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 28 more)] === [2023-11-23 21:08:34,086 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:08:34,087 INFO L85 PathProgramCache]: Analyzing trace with hash 1330367128, now seen corresponding path program 1 times [2023-11-23 21:08:34,087 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:08:34,087 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1467373664] [2023-11-23 21:08:34,087 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:08:34,087 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:08:34,107 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:08:34,164 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 21:08:34,164 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:08:34,164 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1467373664] [2023-11-23 21:08:34,165 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1467373664] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 21:08:34,165 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-23 21:08:34,165 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-11-23 21:08:34,165 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1415100569] [2023-11-23 21:08:34,166 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:08:34,167 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-23 21:08:34,167 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:08:34,168 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-23 21:08:34,168 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-23 21:08:34,168 INFO L87 Difference]: Start difference. First operand 67 states and 73 transitions. Second operand has 3 states, 2 states have (on average 2.5) internal successors, (5), 3 states have internal predecessors, (5), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:08:34,253 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:08:34,253 INFO L93 Difference]: Finished difference Result 65 states and 71 transitions. [2023-11-23 21:08:34,254 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-23 21:08:34,254 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 2.5) internal successors, (5), 3 states have internal predecessors, (5), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 6 [2023-11-23 21:08:34,255 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:08:34,256 INFO L225 Difference]: With dead ends: 65 [2023-11-23 21:08:34,256 INFO L226 Difference]: Without dead ends: 65 [2023-11-23 21:08:34,256 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-23 21:08:34,258 INFO L413 NwaCegarLoop]: 52 mSDtfsCounter, 4 mSDsluCounter, 32 mSDsCounter, 0 mSdLazyCounter, 50 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4 SdHoareTripleChecker+Valid, 84 SdHoareTripleChecker+Invalid, 51 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 50 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-23 21:08:34,259 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [4 Valid, 84 Invalid, 51 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 50 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-23 21:08:34,260 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2023-11-23 21:08:34,266 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 65. [2023-11-23 21:08:34,266 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 65 states, 33 states have (on average 2.0303030303030303) internal successors, (67), 61 states have internal predecessors, (67), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-11-23 21:08:34,268 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 71 transitions. [2023-11-23 21:08:34,268 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 71 transitions. Word has length 6 [2023-11-23 21:08:34,269 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:08:34,269 INFO L495 AbstractCegarLoop]: Abstraction has 65 states and 71 transitions. [2023-11-23 21:08:34,269 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 2.5) internal successors, (5), 3 states have internal predecessors, (5), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:08:34,269 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 71 transitions. [2023-11-23 21:08:34,270 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2023-11-23 21:08:34,270 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:08:34,270 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2023-11-23 21:08:34,270 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2023-11-23 21:08:34,271 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting node_createErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 28 more)] === [2023-11-23 21:08:34,271 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:08:34,271 INFO L85 PathProgramCache]: Analyzing trace with hash 1330367129, now seen corresponding path program 1 times [2023-11-23 21:08:34,272 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:08:34,272 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [143785674] [2023-11-23 21:08:34,272 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:08:34,273 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:08:34,292 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:08:34,474 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 21:08:34,475 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:08:34,475 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [143785674] [2023-11-23 21:08:34,475 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [143785674] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 21:08:34,476 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-23 21:08:34,476 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-11-23 21:08:34,478 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [493266596] [2023-11-23 21:08:34,478 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:08:34,478 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-23 21:08:34,480 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:08:34,481 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-23 21:08:34,484 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-23 21:08:34,485 INFO L87 Difference]: Start difference. First operand 65 states and 71 transitions. Second operand has 3 states, 2 states have (on average 2.5) internal successors, (5), 3 states have internal predecessors, (5), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:08:34,591 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:08:34,592 INFO L93 Difference]: Finished difference Result 63 states and 69 transitions. [2023-11-23 21:08:34,592 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-23 21:08:34,592 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 2.5) internal successors, (5), 3 states have internal predecessors, (5), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 6 [2023-11-23 21:08:34,594 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:08:34,596 INFO L225 Difference]: With dead ends: 63 [2023-11-23 21:08:34,596 INFO L226 Difference]: Without dead ends: 63 [2023-11-23 21:08:34,603 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-23 21:08:34,605 INFO L413 NwaCegarLoop]: 52 mSDtfsCounter, 2 mSDsluCounter, 35 mSDsCounter, 0 mSdLazyCounter, 45 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 87 SdHoareTripleChecker+Invalid, 46 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 45 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-23 21:08:34,607 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [2 Valid, 87 Invalid, 46 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 45 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-23 21:08:34,611 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2023-11-23 21:08:34,617 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 63. [2023-11-23 21:08:34,620 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 63 states, 33 states have (on average 1.9696969696969697) internal successors, (65), 59 states have internal predecessors, (65), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-11-23 21:08:34,622 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 69 transitions. [2023-11-23 21:08:34,624 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 69 transitions. Word has length 6 [2023-11-23 21:08:34,624 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:08:34,624 INFO L495 AbstractCegarLoop]: Abstraction has 63 states and 69 transitions. [2023-11-23 21:08:34,624 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 2.5) internal successors, (5), 3 states have internal predecessors, (5), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:08:34,625 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 69 transitions. [2023-11-23 21:08:34,625 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2023-11-23 21:08:34,626 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:08:34,626 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:08:34,626 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2023-11-23 21:08:34,627 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 28 more)] === [2023-11-23 21:08:34,628 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:08:34,635 INFO L85 PathProgramCache]: Analyzing trace with hash -654861783, now seen corresponding path program 1 times [2023-11-23 21:08:34,635 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:08:34,636 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1687315234] [2023-11-23 21:08:34,636 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:08:34,636 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:08:34,658 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:08:34,767 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 21:08:34,768 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:08:34,768 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1687315234] [2023-11-23 21:08:34,768 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1687315234] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 21:08:34,768 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-23 21:08:34,769 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2023-11-23 21:08:34,769 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1025453015] [2023-11-23 21:08:34,769 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:08:34,770 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-11-23 21:08:34,770 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:08:34,771 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-11-23 21:08:34,771 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-11-23 21:08:34,771 INFO L87 Difference]: Start difference. First operand 63 states and 69 transitions. Second operand has 6 states, 4 states have (on average 2.0) internal successors, (8), 5 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-11-23 21:08:34,918 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:08:34,918 INFO L93 Difference]: Finished difference Result 63 states and 70 transitions. [2023-11-23 21:08:34,918 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-11-23 21:08:34,919 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 4 states have (on average 2.0) internal successors, (8), 5 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 10 [2023-11-23 21:08:34,919 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:08:34,921 INFO L225 Difference]: With dead ends: 63 [2023-11-23 21:08:34,922 INFO L226 Difference]: Without dead ends: 63 [2023-11-23 21:08:34,922 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2023-11-23 21:08:34,924 INFO L413 NwaCegarLoop]: 52 mSDtfsCounter, 5 mSDsluCounter, 123 mSDsCounter, 0 mSdLazyCounter, 164 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 175 SdHoareTripleChecker+Invalid, 165 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 164 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-23 21:08:34,924 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [5 Valid, 175 Invalid, 165 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 164 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-23 21:08:34,925 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 63 states. [2023-11-23 21:08:34,930 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 63 to 62. [2023-11-23 21:08:34,931 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 62 states, 33 states have (on average 1.9393939393939394) internal successors, (64), 58 states have internal predecessors, (64), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-11-23 21:08:34,932 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 68 transitions. [2023-11-23 21:08:34,933 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 68 transitions. Word has length 10 [2023-11-23 21:08:34,933 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:08:34,933 INFO L495 AbstractCegarLoop]: Abstraction has 62 states and 68 transitions. [2023-11-23 21:08:34,934 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 4 states have (on average 2.0) internal successors, (8), 5 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-11-23 21:08:34,934 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 68 transitions. [2023-11-23 21:08:34,934 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2023-11-23 21:08:34,935 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:08:34,935 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:08:34,935 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2023-11-23 21:08:34,935 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 28 more)] === [2023-11-23 21:08:34,936 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:08:34,936 INFO L85 PathProgramCache]: Analyzing trace with hash -654861782, now seen corresponding path program 1 times [2023-11-23 21:08:34,936 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:08:34,937 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [618696315] [2023-11-23 21:08:34,937 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:08:34,937 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:08:34,956 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:08:35,201 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 21:08:35,202 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:08:35,202 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [618696315] [2023-11-23 21:08:35,202 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [618696315] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 21:08:35,202 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-23 21:08:35,203 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2023-11-23 21:08:35,203 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [221816606] [2023-11-23 21:08:35,203 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:08:35,205 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-11-23 21:08:35,205 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:08:35,206 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-11-23 21:08:35,206 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2023-11-23 21:08:35,207 INFO L87 Difference]: Start difference. First operand 62 states and 68 transitions. Second operand has 7 states, 5 states have (on average 1.6) internal successors, (8), 6 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-11-23 21:08:35,370 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:08:35,371 INFO L93 Difference]: Finished difference Result 62 states and 69 transitions. [2023-11-23 21:08:35,371 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-11-23 21:08:35,371 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 5 states have (on average 1.6) internal successors, (8), 6 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 10 [2023-11-23 21:08:35,372 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:08:35,372 INFO L225 Difference]: With dead ends: 62 [2023-11-23 21:08:35,373 INFO L226 Difference]: Without dead ends: 62 [2023-11-23 21:08:35,373 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2023-11-23 21:08:35,374 INFO L413 NwaCegarLoop]: 52 mSDtfsCounter, 4 mSDsluCounter, 186 mSDsCounter, 0 mSdLazyCounter, 162 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4 SdHoareTripleChecker+Valid, 238 SdHoareTripleChecker+Invalid, 163 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 162 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-23 21:08:35,375 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [4 Valid, 238 Invalid, 163 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 162 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-23 21:08:35,376 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2023-11-23 21:08:35,379 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 61. [2023-11-23 21:08:35,380 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 61 states, 33 states have (on average 1.9090909090909092) internal successors, (63), 57 states have internal predecessors, (63), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-11-23 21:08:35,381 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 67 transitions. [2023-11-23 21:08:35,381 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 67 transitions. Word has length 10 [2023-11-23 21:08:35,382 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:08:35,382 INFO L495 AbstractCegarLoop]: Abstraction has 61 states and 67 transitions. [2023-11-23 21:08:35,382 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 5 states have (on average 1.6) internal successors, (8), 6 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-11-23 21:08:35,382 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 67 transitions. [2023-11-23 21:08:35,383 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2023-11-23 21:08:35,383 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:08:35,383 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:08:35,384 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2023-11-23 21:08:35,384 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 28 more)] === [2023-11-23 21:08:35,385 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:08:35,385 INFO L85 PathProgramCache]: Analyzing trace with hash -114926607, now seen corresponding path program 1 times [2023-11-23 21:08:35,385 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:08:35,385 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1681957729] [2023-11-23 21:08:35,385 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:08:35,386 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:08:35,453 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:08:35,626 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2023-11-23 21:08:35,627 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:08:35,627 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1681957729] [2023-11-23 21:08:35,627 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1681957729] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:08:35,627 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1918618619] [2023-11-23 21:08:35,628 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:08:35,632 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:08:35,633 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b170249e-d536-4a57-8bb5-88159e60dc08/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:08:35,635 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b170249e-d536-4a57-8bb5-88159e60dc08/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:08:35,645 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b170249e-d536-4a57-8bb5-88159e60dc08/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-11-23 21:08:35,772 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:08:35,775 INFO L262 TraceCheckSpWp]: Trace formula consists of 241 conjuncts, 5 conjunts are in the unsatisfiable core [2023-11-23 21:08:35,781 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 21:08:35,830 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 5 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 21:08:35,830 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-23 21:08:35,872 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2023-11-23 21:08:35,872 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1918618619] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-23 21:08:35,873 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2141952113] [2023-11-23 21:08:35,893 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-11-23 21:08:35,894 INFO L166 IcfgInterpreter]: Building call graph [2023-11-23 21:08:35,898 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-23 21:08:35,904 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-23 21:08:35,904 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-23 21:08:38,171 INFO L197 IcfgInterpreter]: Interpreting procedure node_create with input of size 123 for LOIs [2023-11-23 21:08:38,888 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-23 21:08:46,090 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '856#(and (<= 1 |#StackHeapBarrier|) (= |ULTIMATE.start_sll_insert_#in~head#1.offset| 0) (= |ULTIMATE.start_sll_insert_#in~index#1| 1) (= |ULTIMATE.start_sll_insert_~snd_to_last~0#1.offset| 0) (= |ULTIMATE.start_sll_insert_~head#1.offset| 0) (= |ULTIMATE.start_sll_insert_#in~data#1| 1) (= |ULTIMATE.start_sll_insert_~snd_to_last~0#1.base| 0) (= |ULTIMATE.start_sll_insert_~new_node~0#1.offset| 0) (= |ULTIMATE.start_sll_insert_~data#1| 1) (= |ULTIMATE.start_sll_create_#res#1.offset| 0) (= |ULTIMATE.start_main_~data~0#1| 1) (= |ULTIMATE.start_sll_insert_~index#1| 1) (= |ULTIMATE.start_main_~#s~0#1.offset| 0) (= |ULTIMATE.start_main_~len~0#1| 2) (<= 2 |ULTIMATE.start_main_~#s~0#1.base|) (not (= (select |#valid| |ULTIMATE.start_sll_insert_~head#1.base|) 1)) (or (and (exists ((|v_#memory_$Pointer$.offset_BEFORE_CALL_17| (Array Int (Array Int Int)))) (= (select (select |v_#memory_$Pointer$.offset_BEFORE_CALL_17| |ULTIMATE.start_main_~#s~0#1.base|) 0) 0)) (exists ((|v_#length_67| (Array Int Int))) (= |#length| (store |v_#length_67| |ULTIMATE.start_sll_insert_~new_node~0#1.base| 8))) (= |ULTIMATE.start_sll_insert_#in~head#1.base| |ULTIMATE.start_main_~#s~0#1.base|) (exists ((|v_#memory_$Pointer$.base_63| (Array Int (Array Int Int)))) (= (store |v_#memory_$Pointer$.base_63| |ULTIMATE.start_sll_insert_~new_node~0#1.base| (store (store (select |v_#memory_$Pointer$.base_63| |ULTIMATE.start_sll_insert_~new_node~0#1.base|) 4 0) 0 (select (select |#memory_$Pointer$.base| |ULTIMATE.start_sll_insert_~new_node~0#1.base|) 0))) |#memory_$Pointer$.base|)) (exists ((|v_#valid_82| (Array Int Int))) (and (= (store |v_#valid_82| |ULTIMATE.start_sll_insert_~new_node~0#1.base| 1) |#valid|) (= (select |v_#valid_82| |ULTIMATE.start_sll_insert_~new_node~0#1.base|) 0))) (exists ((|v_#memory_int_44| (Array Int (Array Int Int))) (|v_#memory_int_45| (Array Int (Array Int Int)))) (and (= |v_#memory_int_45| (store |v_#memory_int_44| |ULTIMATE.start_sll_insert_~new_node~0#1.base| (store (select |v_#memory_int_44| |ULTIMATE.start_sll_insert_~new_node~0#1.base|) 4 (select (select |v_#memory_int_45| |ULTIMATE.start_sll_insert_~new_node~0#1.base|) 4)))) (= |#memory_int| (store |v_#memory_int_45| |ULTIMATE.start_sll_insert_~new_node~0#1.base| (store (select |v_#memory_int_45| |ULTIMATE.start_sll_insert_~new_node~0#1.base|) 0 1))))) (not (= |ULTIMATE.start_sll_insert_~new_node~0#1.base| 0)) (<= (+ |ULTIMATE.start_sll_insert_~new_node~0#1.base| 1) |#StackHeapBarrier|) (exists ((|v_old(#memory_$Pointer$.base)_AFTER_CALL_10| (Array Int (Array Int Int)))) (= (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_#memory_$Pointer$.offset_63| (Array Int (Array Int Int)))) (= |#memory_$Pointer$.offset| (store |v_#memory_$Pointer$.offset_63| |ULTIMATE.start_sll_insert_~new_node~0#1.base| (store (store (select |v_#memory_$Pointer$.offset_63| |ULTIMATE.start_sll_insert_~new_node~0#1.base|) 4 0) 0 (select (select |#memory_$Pointer$.offset| |ULTIMATE.start_sll_insert_~new_node~0#1.base|) 0))))) (= |ULTIMATE.start_sll_insert_#in~head#1.base| |ULTIMATE.start_sll_insert_~head#1.base|)) (and (exists ((|v_old(#memory_$Pointer$.offset)_AFTER_CALL_9| (Array Int (Array Int Int)))) (= (select (select |v_old(#memory_$Pointer$.offset)_AFTER_CALL_9| |ULTIMATE.start_main_~#s~0#1.base|) 0) 0)) (exists ((|v_#length_67| (Array Int Int))) (= |#length| (store |v_#length_67| |ULTIMATE.start_sll_insert_~new_node~0#1.base| 8))) (= |ULTIMATE.start_sll_insert_#in~head#1.base| |ULTIMATE.start_main_~#s~0#1.base|) (exists ((|v_#memory_$Pointer$.base_63| (Array Int (Array Int Int)))) (= (store |v_#memory_$Pointer$.base_63| |ULTIMATE.start_sll_insert_~new_node~0#1.base| (store (store (select |v_#memory_$Pointer$.base_63| |ULTIMATE.start_sll_insert_~new_node~0#1.base|) 4 0) 0 (select (select |#memory_$Pointer$.base| |ULTIMATE.start_sll_insert_~new_node~0#1.base|) 0))) |#memory_$Pointer$.base|)) (exists ((|v_#valid_82| (Array Int Int))) (and (= (store |v_#valid_82| |ULTIMATE.start_sll_insert_~new_node~0#1.base| 1) |#valid|) (= (select |v_#valid_82| |ULTIMATE.start_sll_insert_~new_node~0#1.base|) 0))) (exists ((|v_#memory_int_44| (Array Int (Array Int Int))) (|v_#memory_int_45| (Array Int (Array Int Int)))) (and (= |v_#memory_int_45| (store |v_#memory_int_44| |ULTIMATE.start_sll_insert_~new_node~0#1.base| (store (select |v_#memory_int_44| |ULTIMATE.start_sll_insert_~new_node~0#1.base|) 4 (select (select |v_#memory_int_45| |ULTIMATE.start_sll_insert_~new_node~0#1.base|) 4)))) (= |#memory_int| (store |v_#memory_int_45| |ULTIMATE.start_sll_insert_~new_node~0#1.base| (store (select |v_#memory_int_45| |ULTIMATE.start_sll_insert_~new_node~0#1.base|) 0 1))))) (not (= |ULTIMATE.start_sll_insert_~new_node~0#1.base| 0)) (<= (+ |ULTIMATE.start_sll_insert_~new_node~0#1.base| 1) |#StackHeapBarrier|) (exists ((|v_#memory_$Pointer$.offset_63| (Array Int (Array Int Int)))) (= |#memory_$Pointer$.offset| (store |v_#memory_$Pointer$.offset_63| |ULTIMATE.start_sll_insert_~new_node~0#1.base| (store (store (select |v_#memory_$Pointer$.offset_63| |ULTIMATE.start_sll_insert_~new_node~0#1.base|) 4 0) 0 (select (select |#memory_$Pointer$.offset| |ULTIMATE.start_sll_insert_~new_node~0#1.base|) 0))))) (exists ((|v_old(#memory_$Pointer$.base)_AFTER_CALL_9| (Array Int (Array Int Int)))) (= (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|)) (= |ULTIMATE.start_sll_insert_#in~head#1.base| |ULTIMATE.start_sll_insert_~head#1.base|))))' at error location [2023-11-23 21:08:46,090 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-23 21:08:46,091 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-23 21:08:46,091 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 5 [2023-11-23 21:08:46,091 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2134740880] [2023-11-23 21:08:46,091 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-23 21:08:46,092 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-11-23 21:08:46,092 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:08:46,093 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-11-23 21:08:46,093 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=41, Invalid=230, Unknown=1, NotChecked=0, Total=272 [2023-11-23 21:08:46,094 INFO L87 Difference]: Start difference. First operand 61 states and 67 transitions. Second operand has 5 states, 5 states have (on average 3.8) internal successors, (19), 5 states have internal predecessors, (19), 3 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) [2023-11-23 21:08:46,152 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:08:46,153 INFO L93 Difference]: Finished difference Result 65 states and 72 transitions. [2023-11-23 21:08:46,157 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-11-23 21:08:46,157 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 3.8) internal successors, (19), 5 states have internal predecessors, (19), 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 19 [2023-11-23 21:08:46,157 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:08:46,158 INFO L225 Difference]: With dead ends: 65 [2023-11-23 21:08:46,158 INFO L226 Difference]: Without dead ends: 65 [2023-11-23 21:08:46,159 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 59 GetRequests, 42 SyntacticMatches, 2 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 47 ImplicationChecksByTransitivity, 7.2s TimeCoverageRelationStatistics Valid=41, Invalid=230, Unknown=1, NotChecked=0, Total=272 [2023-11-23 21:08:46,160 INFO L413 NwaCegarLoop]: 51 mSDtfsCounter, 2 mSDsluCounter, 50 mSDsCounter, 0 mSdLazyCounter, 31 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 101 SdHoareTripleChecker+Invalid, 32 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 31 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-23 21:08:46,160 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [3 Valid, 101 Invalid, 32 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 31 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-23 21:08:46,161 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 65 states. [2023-11-23 21:08:46,165 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 65 to 65. [2023-11-23 21:08:46,165 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 65 states, 36 states have (on average 1.8333333333333333) internal successors, (66), 60 states have internal predecessors, (66), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-11-23 21:08:46,166 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 65 states to 65 states and 72 transitions. [2023-11-23 21:08:46,167 INFO L78 Accepts]: Start accepts. Automaton has 65 states and 72 transitions. Word has length 19 [2023-11-23 21:08:46,167 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:08:46,167 INFO L495 AbstractCegarLoop]: Abstraction has 65 states and 72 transitions. [2023-11-23 21:08:46,167 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 3.8) internal successors, (19), 5 states have internal predecessors, (19), 3 states have call successors, (4), 2 states have call predecessors, (4), 2 states have return successors, (4), 3 states have call predecessors, (4), 3 states have call successors, (4) [2023-11-23 21:08:46,167 INFO L276 IsEmpty]: Start isEmpty. Operand 65 states and 72 transitions. [2023-11-23 21:08:46,168 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2023-11-23 21:08:46,168 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:08:46,169 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1] [2023-11-23 21:08:46,196 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b170249e-d536-4a57-8bb5-88159e60dc08/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-11-23 21:08:46,395 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b170249e-d536-4a57-8bb5-88159e60dc08/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:08:46,395 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 28 more)] === [2023-11-23 21:08:46,396 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:08:46,396 INFO L85 PathProgramCache]: Analyzing trace with hash 1859508146, now seen corresponding path program 2 times [2023-11-23 21:08:46,396 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:08:46,396 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1695208316] [2023-11-23 21:08:46,396 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:08:46,396 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:08:46,470 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:08:47,105 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 11 trivial. 0 not checked. [2023-11-23 21:08:47,105 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:08:47,105 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1695208316] [2023-11-23 21:08:47,106 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1695208316] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:08:47,106 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [773416470] [2023-11-23 21:08:47,106 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-23 21:08:47,106 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:08:47,106 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b170249e-d536-4a57-8bb5-88159e60dc08/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:08:47,111 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b170249e-d536-4a57-8bb5-88159e60dc08/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:08:47,145 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b170249e-d536-4a57-8bb5-88159e60dc08/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-11-23 21:08:47,302 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2023-11-23 21:08:47,302 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-23 21:08:47,305 INFO L262 TraceCheckSpWp]: Trace formula consists of 335 conjuncts, 23 conjunts are in the unsatisfiable core [2023-11-23 21:08:47,309 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 21:08:47,338 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2023-11-23 21:08:47,376 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 5 treesize of output 3 [2023-11-23 21:08:47,386 WARN L876 $PredicateComparison]: unable to prove that (exists ((|node_create_~temp~0#1.base| Int)) (= |c_#valid| (store |c_old(#valid)| |node_create_~temp~0#1.base| 1))) is different from true [2023-11-23 21:08:47,422 INFO L349 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2023-11-23 21:08:47,423 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 12 treesize of output 14 [2023-11-23 21:08:47,474 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 5 treesize of output 3 [2023-11-23 21:08:47,518 INFO L349 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2023-11-23 21:08:47,519 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 12 treesize of output 14 [2023-11-23 21:08:47,591 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 5 treesize of output 3 [2023-11-23 21:08:47,608 WARN L876 $PredicateComparison]: unable to prove that (exists ((|node_create_~temp~0#1.base| Int)) (and (<= (+ |node_create_~temp~0#1.base| 1) |c_#StackHeapBarrier|) (= |c_#valid| (store |c_old(#valid)| |node_create_~temp~0#1.base| (select |c_#valid| |node_create_~temp~0#1.base|))))) is different from true [2023-11-23 21:08:47,643 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-23 21:08:47,645 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 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 14 treesize of output 9 [2023-11-23 21:08:47,650 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 13 trivial. 8 not checked. [2023-11-23 21:08:47,650 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-23 21:08:47,732 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [773416470] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:08:47,732 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2056276000] [2023-11-23 21:08:47,735 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-11-23 21:08:47,735 INFO L166 IcfgInterpreter]: Building call graph [2023-11-23 21:08:47,735 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-23 21:08:47,736 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-23 21:08:47,736 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-23 21:08:49,546 INFO L197 IcfgInterpreter]: Interpreting procedure node_create with input of size 144 for LOIs [2023-11-23 21:08:50,280 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-23 21:09:00,627 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1103#(and (or (and (exists ((|v_#valid_95| (Array Int Int))) (and (= (select |v_#valid_95| |ULTIMATE.start_sll_insert_~new_node~0#1.base|) 0) (= (store |v_#valid_95| |ULTIMATE.start_sll_insert_~new_node~0#1.base| 1) |#valid|))) (exists ((|v_#length_74| (Array Int Int))) (= |#length| (store |v_#length_74| |ULTIMATE.start_sll_insert_~new_node~0#1.base| 8))) (exists ((|v_old(#memory_$Pointer$.base)_AFTER_CALL_21| (Array Int (Array Int Int))) (|v_#memory_$Pointer$.base_79| (Array Int (Array Int Int)))) (and (= (store |v_#memory_$Pointer$.base_79| |ULTIMATE.start_sll_create_#res#1.base| (store (select |v_#memory_$Pointer$.base_79| |ULTIMATE.start_sll_create_#res#1.base|) 4 (select (select |v_old(#memory_$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$.base)_AFTER_CALL_21| |ULTIMATE.start_main_~#s~0#1.base|) 0) |ULTIMATE.start_sll_create_#res#1.base|))) (exists ((|v_old(#valid)_AFTER_CALL_21| (Array Int Int))) (= (select |v_old(#valid)_AFTER_CALL_21| |ULTIMATE.start_sll_create_#res#1.base|) 1)) (exists ((|v_#memory_$Pointer$.offset_75| (Array Int (Array Int Int)))) (= |#memory_$Pointer$.offset| (store |v_#memory_$Pointer$.offset_75| |ULTIMATE.start_sll_insert_~new_node~0#1.base| (store (store (select |v_#memory_$Pointer$.offset_75| |ULTIMATE.start_sll_insert_~new_node~0#1.base|) 4 0) 0 (select (select |#memory_$Pointer$.offset| |ULTIMATE.start_sll_insert_~new_node~0#1.base|) 0))))) (= |ULTIMATE.start_sll_insert_#in~head#1.base| |ULTIMATE.start_main_~#s~0#1.base|) (exists ((|v_#memory_int_60| (Array Int (Array Int Int))) (|v_old(#memory_int)_AFTER_CALL_21| (Array Int (Array Int Int)))) (= (store |v_#memory_int_60| |ULTIMATE.start_sll_create_#res#1.base| (store (select |v_#memory_int_60| |ULTIMATE.start_sll_create_#res#1.base|) 4 (select (select |v_old(#memory_int)_AFTER_CALL_21| |ULTIMATE.start_sll_create_#res#1.base|) 4))) |v_old(#memory_int)_AFTER_CALL_21|)) (not (= |ULTIMATE.start_sll_insert_~new_node~0#1.base| 0)) (<= (+ |ULTIMATE.start_sll_insert_~new_node~0#1.base| 1) |#StackHeapBarrier|) (exists ((|v_#memory_$Pointer$.base_75| (Array Int (Array Int Int)))) (= (store |v_#memory_$Pointer$.base_75| |ULTIMATE.start_sll_insert_~new_node~0#1.base| (store (store (select |v_#memory_$Pointer$.base_75| |ULTIMATE.start_sll_insert_~new_node~0#1.base|) 4 0) 0 (select (select |#memory_$Pointer$.base| |ULTIMATE.start_sll_insert_~new_node~0#1.base|) 0))) |#memory_$Pointer$.base|)) (exists ((|v_#memory_int_56| (Array Int (Array Int Int))) (|v_#memory_int_57| (Array Int (Array Int Int)))) (and (= |#memory_int| (store |v_#memory_int_57| |ULTIMATE.start_sll_insert_~new_node~0#1.base| (store (select |v_#memory_int_57| |ULTIMATE.start_sll_insert_~new_node~0#1.base|) 0 1))) (= |v_#memory_int_57| (store |v_#memory_int_56| |ULTIMATE.start_sll_insert_~new_node~0#1.base| (store (select |v_#memory_int_56| |ULTIMATE.start_sll_insert_~new_node~0#1.base|) 4 (select (select |v_#memory_int_57| |ULTIMATE.start_sll_insert_~new_node~0#1.base|) 4)))))) (exists ((|v_#memory_$Pointer$.offset_79| (Array Int (Array Int Int)))) (= (select (select (store |v_#memory_$Pointer$.offset_79| |ULTIMATE.start_sll_create_#res#1.base| (store (select |v_#memory_$Pointer$.offset_79| |ULTIMATE.start_sll_create_#res#1.base|) 4 0)) |ULTIMATE.start_main_~#s~0#1.base|) 0) 0)) (= |ULTIMATE.start_sll_insert_#in~head#1.base| |ULTIMATE.start_sll_insert_~head#1.base|) (exists ((|v_#length_BEFORE_CALL_35| (Array Int Int))) (<= 8 (select |v_#length_BEFORE_CALL_35| |ULTIMATE.start_sll_create_#res#1.base|)))) (and (exists ((|v_#valid_95| (Array Int Int))) (and (= (select |v_#valid_95| |ULTIMATE.start_sll_insert_~new_node~0#1.base|) 0) (= (store |v_#valid_95| |ULTIMATE.start_sll_insert_~new_node~0#1.base| 1) |#valid|))) (exists ((|v_#length_74| (Array Int Int))) (= |#length| (store |v_#length_74| |ULTIMATE.start_sll_insert_~new_node~0#1.base| 8))) (exists ((|v_#memory_$Pointer$.offset_75| (Array Int (Array Int Int)))) (= |#memory_$Pointer$.offset| (store |v_#memory_$Pointer$.offset_75| |ULTIMATE.start_sll_insert_~new_node~0#1.base| (store (store (select |v_#memory_$Pointer$.offset_75| |ULTIMATE.start_sll_insert_~new_node~0#1.base|) 4 0) 0 (select (select |#memory_$Pointer$.offset| |ULTIMATE.start_sll_insert_~new_node~0#1.base|) 0))))) (= |ULTIMATE.start_sll_insert_#in~head#1.base| |ULTIMATE.start_main_~#s~0#1.base|) (exists ((|v_old(#memory_$Pointer$.base)_AFTER_CALL_20| (Array Int (Array Int Int))) (|v_#memory_$Pointer$.base_79| (Array Int (Array Int Int)))) (and (= (select (select |v_old(#memory_$Pointer$.base)_AFTER_CALL_20| |ULTIMATE.start_main_~#s~0#1.base|) 0) |ULTIMATE.start_sll_create_#res#1.base|) (= |v_old(#memory_$Pointer$.base)_AFTER_CALL_20| (store |v_#memory_$Pointer$.base_79| |ULTIMATE.start_sll_create_#res#1.base| (store (select |v_#memory_$Pointer$.base_79| |ULTIMATE.start_sll_create_#res#1.base|) 4 (select (select |v_old(#memory_$Pointer$.base)_AFTER_CALL_20| |ULTIMATE.start_sll_create_#res#1.base|) 4)))))) (exists ((|v_old(#length)_AFTER_CALL_20| (Array Int Int))) (<= 8 (select |v_old(#length)_AFTER_CALL_20| |ULTIMATE.start_sll_create_#res#1.base|))) (exists ((|v_old(#valid)_AFTER_CALL_20| (Array Int Int))) (= (select |v_old(#valid)_AFTER_CALL_20| |ULTIMATE.start_sll_create_#res#1.base|) 1)) (not (= |ULTIMATE.start_sll_insert_~new_node~0#1.base| 0)) (<= (+ |ULTIMATE.start_sll_insert_~new_node~0#1.base| 1) |#StackHeapBarrier|) (exists ((|v_#memory_$Pointer$.base_75| (Array Int (Array Int Int)))) (= (store |v_#memory_$Pointer$.base_75| |ULTIMATE.start_sll_insert_~new_node~0#1.base| (store (store (select |v_#memory_$Pointer$.base_75| |ULTIMATE.start_sll_insert_~new_node~0#1.base|) 4 0) 0 (select (select |#memory_$Pointer$.base| |ULTIMATE.start_sll_insert_~new_node~0#1.base|) 0))) |#memory_$Pointer$.base|)) (exists ((|v_#memory_int_56| (Array Int (Array Int Int))) (|v_#memory_int_57| (Array Int (Array Int Int)))) (and (= |#memory_int| (store |v_#memory_int_57| |ULTIMATE.start_sll_insert_~new_node~0#1.base| (store (select |v_#memory_int_57| |ULTIMATE.start_sll_insert_~new_node~0#1.base|) 0 1))) (= |v_#memory_int_57| (store |v_#memory_int_56| |ULTIMATE.start_sll_insert_~new_node~0#1.base| (store (select |v_#memory_int_56| |ULTIMATE.start_sll_insert_~new_node~0#1.base|) 4 (select (select |v_#memory_int_57| |ULTIMATE.start_sll_insert_~new_node~0#1.base|) 4)))))) (exists ((|v_#memory_$Pointer$.offset_79| (Array Int (Array Int Int)))) (= (select (select (store |v_#memory_$Pointer$.offset_79| |ULTIMATE.start_sll_create_#res#1.base| (store (select |v_#memory_$Pointer$.offset_79| |ULTIMATE.start_sll_create_#res#1.base|) 4 0)) |ULTIMATE.start_main_~#s~0#1.base|) 0) 0)) (exists ((|v_#memory_int_60| (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_60| |ULTIMATE.start_sll_create_#res#1.base| (store (select |v_#memory_int_60| |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))))) (= |ULTIMATE.start_sll_insert_#in~head#1.base| |ULTIMATE.start_sll_insert_~head#1.base|))) (<= 1 |#StackHeapBarrier|) (= |ULTIMATE.start_sll_insert_#in~head#1.offset| 0) (= |ULTIMATE.start_sll_insert_#in~index#1| 1) (= |ULTIMATE.start_sll_insert_~snd_to_last~0#1.offset| 0) (= |ULTIMATE.start_sll_insert_~head#1.offset| 0) (= |ULTIMATE.start_sll_insert_#in~data#1| 1) (= |ULTIMATE.start_sll_insert_~snd_to_last~0#1.base| 0) (= |ULTIMATE.start_sll_insert_~new_node~0#1.offset| 0) (= |ULTIMATE.start_sll_insert_~data#1| 1) (= |ULTIMATE.start_sll_create_#res#1.offset| 0) (= |ULTIMATE.start_main_~data~0#1| 1) (= |ULTIMATE.start_sll_insert_~index#1| 1) (= |ULTIMATE.start_main_~#s~0#1.offset| 0) (= |ULTIMATE.start_main_~len~0#1| 2) (<= 2 |ULTIMATE.start_main_~#s~0#1.base|) (not (= (select |#valid| |ULTIMATE.start_sll_insert_~head#1.base|) 1)))' at error location [2023-11-23 21:09:00,627 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-23 21:09:00,628 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-11-23 21:09:00,628 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 6] total 12 [2023-11-23 21:09:00,628 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1843722254] [2023-11-23 21:09:00,628 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-11-23 21:09:00,629 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 14 states [2023-11-23 21:09:00,629 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:09:00,630 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 14 interpolants. [2023-11-23 21:09:00,630 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=83, Invalid=522, Unknown=3, NotChecked=94, Total=702 [2023-11-23 21:09:00,631 INFO L87 Difference]: Start difference. First operand 65 states and 72 transitions. Second operand has 14 states, 10 states have (on average 3.1) internal successors, (31), 12 states have internal predecessors, (31), 4 states have call successors, (4), 1 states have call predecessors, (4), 4 states have return successors, (5), 3 states have call predecessors, (5), 4 states have call successors, (5) [2023-11-23 21:09:01,121 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:09:01,121 INFO L93 Difference]: Finished difference Result 71 states and 79 transitions. [2023-11-23 21:09:01,122 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-11-23 21:09:01,122 INFO L78 Accepts]: Start accepts. Automaton has has 14 states, 10 states have (on average 3.1) internal successors, (31), 12 states have internal predecessors, (31), 4 states have call successors, (4), 1 states have call predecessors, (4), 4 states have return successors, (5), 3 states have call predecessors, (5), 4 states have call successors, (5) Word has length 28 [2023-11-23 21:09:01,122 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:09:01,123 INFO L225 Difference]: With dead ends: 71 [2023-11-23 21:09:01,123 INFO L226 Difference]: Without dead ends: 71 [2023-11-23 21:09:01,124 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 75 GetRequests, 46 SyntacticMatches, 2 SemanticMatches, 27 ConstructedPredicates, 2 IntricatePredicates, 0 DeprecatedPredicates, 160 ImplicationChecksByTransitivity, 10.7s TimeCoverageRelationStatistics Valid=100, Invalid=607, Unknown=3, NotChecked=102, Total=812 [2023-11-23 21:09:01,125 INFO L413 NwaCegarLoop]: 26 mSDtfsCounter, 82 mSDsluCounter, 95 mSDsCounter, 0 mSdLazyCounter, 196 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 82 SdHoareTripleChecker+Valid, 121 SdHoareTripleChecker+Invalid, 339 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 196 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 138 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-11-23 21:09:01,126 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [82 Valid, 121 Invalid, 339 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 196 Invalid, 0 Unknown, 138 Unchecked, 0.3s Time] [2023-11-23 21:09:01,127 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 71 states. [2023-11-23 21:09:01,133 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 71 to 61. [2023-11-23 21:09:01,134 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 61 states, 36 states have (on average 1.7222222222222223) internal successors, (62), 56 states have internal predecessors, (62), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-11-23 21:09:01,135 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 68 transitions. [2023-11-23 21:09:01,135 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 68 transitions. Word has length 28 [2023-11-23 21:09:01,136 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:09:01,136 INFO L495 AbstractCegarLoop]: Abstraction has 61 states and 68 transitions. [2023-11-23 21:09:01,136 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 14 states, 10 states have (on average 3.1) internal successors, (31), 12 states have internal predecessors, (31), 4 states have call successors, (4), 1 states have call predecessors, (4), 4 states have return successors, (5), 3 states have call predecessors, (5), 4 states have call successors, (5) [2023-11-23 21:09:01,137 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 68 transitions. [2023-11-23 21:09:01,138 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2023-11-23 21:09:01,138 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:09:01,138 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1] [2023-11-23 21:09:01,171 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b170249e-d536-4a57-8bb5-88159e60dc08/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2023-11-23 21:09:01,357 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b170249e-d536-4a57-8bb5-88159e60dc08/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:09:01,358 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 28 more)] === [2023-11-23 21:09:01,358 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:09:01,358 INFO L85 PathProgramCache]: Analyzing trace with hash 1859508147, now seen corresponding path program 1 times [2023-11-23 21:09:01,358 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:09:01,358 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [936523406] [2023-11-23 21:09:01,359 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:09:01,359 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:09:01,410 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:09:02,495 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 18 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-11-23 21:09:02,496 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:09:02,496 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [936523406] [2023-11-23 21:09:02,496 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [936523406] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:09:02,496 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [582525842] [2023-11-23 21:09:02,496 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:09:02,496 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:09:02,496 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b170249e-d536-4a57-8bb5-88159e60dc08/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:09:02,498 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b170249e-d536-4a57-8bb5-88159e60dc08/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:09:02,502 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b170249e-d536-4a57-8bb5-88159e60dc08/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-11-23 21:09:02,675 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:09:02,678 INFO L262 TraceCheckSpWp]: Trace formula consists of 335 conjuncts, 26 conjunts are in the unsatisfiable core [2023-11-23 21:09:02,684 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 21:09:02,695 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 8 treesize of output 1 [2023-11-23 21:09:02,750 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 5 treesize of output 3 [2023-11-23 21:09:02,762 WARN L876 $PredicateComparison]: unable to prove that (exists ((|node_create_~temp~0#1.base| Int)) (and (<= (+ |node_create_~temp~0#1.base| 1) |c_#StackHeapBarrier|) (= (store |c_old(#length)| |node_create_~temp~0#1.base| (select |c_#length| |node_create_~temp~0#1.base|)) |c_#length|))) is different from true [2023-11-23 21:09:02,800 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-23 21:09:02,802 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 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 14 treesize of output 9 [2023-11-23 21:09:02,842 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 5 treesize of output 3 [2023-11-23 21:09:02,885 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-23 21:09:02,887 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 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 14 treesize of output 9 [2023-11-23 21:09:02,964 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 5 treesize of output 3 [2023-11-23 21:09:03,023 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-23 21:09:03,024 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 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 14 treesize of output 9 [2023-11-23 21:09:03,060 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 21 trivial. 0 not checked. [2023-11-23 21:09:03,060 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-23 21:09:03,061 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [582525842] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 21:09:03,061 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-23 21:09:03,061 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [12] total 16 [2023-11-23 21:09:03,061 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1213342731] [2023-11-23 21:09:03,061 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:09:03,062 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-11-23 21:09:03,062 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:09:03,065 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-11-23 21:09:03,065 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=53, Invalid=222, Unknown=1, NotChecked=30, Total=306 [2023-11-23 21:09:03,066 INFO L87 Difference]: Start difference. First operand 61 states and 68 transitions. Second operand has 7 states, 5 states have (on average 2.2) internal successors, (11), 5 states have internal predecessors, (11), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-11-23 21:09:03,258 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:09:03,258 INFO L93 Difference]: Finished difference Result 59 states and 66 transitions. [2023-11-23 21:09:03,259 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-11-23 21:09:03,259 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 5 states have (on average 2.2) internal successors, (11), 5 states have internal predecessors, (11), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 28 [2023-11-23 21:09:03,260 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:09:03,260 INFO L225 Difference]: With dead ends: 59 [2023-11-23 21:09:03,261 INFO L226 Difference]: Without dead ends: 59 [2023-11-23 21:09:03,261 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 42 GetRequests, 25 SyntacticMatches, 0 SemanticMatches, 17 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 54 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=58, Invalid=251, Unknown=1, NotChecked=32, Total=342 [2023-11-23 21:09:03,262 INFO L413 NwaCegarLoop]: 37 mSDtfsCounter, 15 mSDsluCounter, 99 mSDsCounter, 0 mSdLazyCounter, 116 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 15 SdHoareTripleChecker+Valid, 136 SdHoareTripleChecker+Invalid, 195 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 116 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 78 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-23 21:09:03,263 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [15 Valid, 136 Invalid, 195 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 116 Invalid, 0 Unknown, 78 Unchecked, 0.1s Time] [2023-11-23 21:09:03,263 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2023-11-23 21:09:03,268 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 59. [2023-11-23 21:09:03,268 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 59 states, 36 states have (on average 1.6666666666666667) internal successors, (60), 54 states have internal predecessors, (60), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-11-23 21:09:03,269 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 66 transitions. [2023-11-23 21:09:03,269 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 66 transitions. Word has length 28 [2023-11-23 21:09:03,269 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:09:03,270 INFO L495 AbstractCegarLoop]: Abstraction has 59 states and 66 transitions. [2023-11-23 21:09:03,270 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 5 states have (on average 2.2) internal successors, (11), 5 states have internal predecessors, (11), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-11-23 21:09:03,270 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 66 transitions. [2023-11-23 21:09:03,271 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2023-11-23 21:09:03,271 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:09:03,271 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:09:03,296 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b170249e-d536-4a57-8bb5-88159e60dc08/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Ended with exit code 0 [2023-11-23 21:09:03,486 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b170249e-d536-4a57-8bb5-88159e60dc08/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:09:03,487 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr4REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 28 more)] === [2023-11-23 21:09:03,488 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:09:03,488 INFO L85 PathProgramCache]: Analyzing trace with hash 281067038, now seen corresponding path program 1 times [2023-11-23 21:09:03,488 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:09:03,488 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [720776919] [2023-11-23 21:09:03,488 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:09:03,489 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:09:03,530 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:09:04,434 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 15 proven. 3 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-11-23 21:09:04,434 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:09:04,435 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [720776919] [2023-11-23 21:09:04,435 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [720776919] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:09:04,435 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1577092396] [2023-11-23 21:09:04,435 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:09:04,435 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:09:04,435 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b170249e-d536-4a57-8bb5-88159e60dc08/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:09:04,437 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b170249e-d536-4a57-8bb5-88159e60dc08/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:09:04,474 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b170249e-d536-4a57-8bb5-88159e60dc08/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-11-23 21:09:04,927 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:09:04,931 INFO L262 TraceCheckSpWp]: Trace formula consists of 348 conjuncts, 40 conjunts are in the unsatisfiable core [2023-11-23 21:09:04,935 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 21:09:05,162 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 9 treesize of output 5 [2023-11-23 21:09:05,265 WARN L876 $PredicateComparison]: unable to prove that (exists ((|node_create_~temp~0#1.base| Int)) (and (<= (+ |node_create_~temp~0#1.base| 1) |c_#StackHeapBarrier|) (= |c_#memory_$Pointer$.base| (store |c_old(#memory_$Pointer$.base)| |node_create_~temp~0#1.base| (select |c_#memory_$Pointer$.base| |node_create_~temp~0#1.base|))) (= |c_#valid| (store |c_old(#valid)| |node_create_~temp~0#1.base| 1)))) is different from true [2023-11-23 21:09:05,281 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-23 21:09:05,282 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 18 treesize of output 13 [2023-11-23 21:09:05,300 INFO L349 Elim1Store]: treesize reduction 27, result has 25.0 percent of original size [2023-11-23 21:09:05,301 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 16 treesize of output 18 [2023-11-23 21:09:05,418 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 17 treesize of output 9 [2023-11-23 21:09:05,462 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 12 proven. 0 refuted. 0 times theorem prover too weak. 9 trivial. 0 not checked. [2023-11-23 21:09:05,462 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-23 21:09:05,462 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1577092396] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 21:09:05,462 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-23 21:09:05,462 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [10] imperfect sequences [14] total 20 [2023-11-23 21:09:05,463 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1470892650] [2023-11-23 21:09:05,463 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:09:05,463 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2023-11-23 21:09:05,463 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:09:05,464 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2023-11-23 21:09:05,465 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=57, Invalid=326, Unknown=1, NotChecked=36, Total=420 [2023-11-23 21:09:05,465 INFO L87 Difference]: Start difference. First operand 59 states and 66 transitions. Second operand has 11 states, 8 states have (on average 2.25) internal successors, (18), 10 states have internal predecessors, (18), 2 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-11-23 21:09:06,161 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:09:06,161 INFO L93 Difference]: Finished difference Result 70 states and 79 transitions. [2023-11-23 21:09:06,161 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2023-11-23 21:09:06,162 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 8 states have (on average 2.25) internal successors, (18), 10 states have internal predecessors, (18), 2 states have call successors, (2), 2 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 30 [2023-11-23 21:09:06,162 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:09:06,163 INFO L225 Difference]: With dead ends: 70 [2023-11-23 21:09:06,163 INFO L226 Difference]: Without dead ends: 70 [2023-11-23 21:09:06,164 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 48 GetRequests, 23 SyntacticMatches, 2 SemanticMatches, 23 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 97 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=90, Invalid=465, Unknown=1, NotChecked=44, Total=600 [2023-11-23 21:09:06,165 INFO L413 NwaCegarLoop]: 33 mSDtfsCounter, 108 mSDsluCounter, 154 mSDsCounter, 0 mSdLazyCounter, 293 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 108 SdHoareTripleChecker+Valid, 187 SdHoareTripleChecker+Invalid, 375 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 293 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 77 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2023-11-23 21:09:06,165 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [108 Valid, 187 Invalid, 375 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 293 Invalid, 0 Unknown, 77 Unchecked, 0.5s Time] [2023-11-23 21:09:06,166 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2023-11-23 21:09:06,170 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 61. [2023-11-23 21:09:06,171 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 61 states, 38 states have (on average 1.6842105263157894) internal successors, (64), 56 states have internal predecessors, (64), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-11-23 21:09:06,172 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 70 transitions. [2023-11-23 21:09:06,172 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 70 transitions. Word has length 30 [2023-11-23 21:09:06,173 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:09:06,173 INFO L495 AbstractCegarLoop]: Abstraction has 61 states and 70 transitions. [2023-11-23 21:09:06,173 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 8 states have (on average 2.25) internal successors, (18), 10 states have internal predecessors, (18), 2 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-11-23 21:09:06,173 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 70 transitions. [2023-11-23 21:09:06,175 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2023-11-23 21:09:06,175 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:09:06,175 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:09:06,216 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b170249e-d536-4a57-8bb5-88159e60dc08/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2023-11-23 21:09:06,394 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b170249e-d536-4a57-8bb5-88159e60dc08/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:09:06,395 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 28 more)] === [2023-11-23 21:09:06,396 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:09:06,396 INFO L85 PathProgramCache]: Analyzing trace with hash 281067039, now seen corresponding path program 1 times [2023-11-23 21:09:06,396 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:09:06,396 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [65347286] [2023-11-23 21:09:06,396 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:09:06,396 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:09:06,460 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:09:07,977 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 14 proven. 4 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-11-23 21:09:07,978 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:09:07,978 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [65347286] [2023-11-23 21:09:07,978 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [65347286] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:09:07,978 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [110671688] [2023-11-23 21:09:07,978 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:09:07,978 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:09:07,979 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b170249e-d536-4a57-8bb5-88159e60dc08/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:09:07,981 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b170249e-d536-4a57-8bb5-88159e60dc08/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:09:07,986 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_b170249e-d536-4a57-8bb5-88159e60dc08/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-11-23 21:09:08,504 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:09:08,508 INFO L262 TraceCheckSpWp]: Trace formula consists of 348 conjuncts, 62 conjunts are in the unsatisfiable core [2023-11-23 21:09:08,516 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 21:09:08,600 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 8 treesize of output 1 [2023-11-23 21:09:08,952 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 19 treesize of output 11 [2023-11-23 21:09:08,964 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 3 [2023-11-23 21:09:09,063 WARN L876 $PredicateComparison]: unable to prove that (exists ((|node_create_~temp~0#1.base| Int)) (and (<= (+ |node_create_~temp~0#1.base| 1) |c_#StackHeapBarrier|) (= (store |c_old(#length)| |node_create_~temp~0#1.base| (select |c_#length| |node_create_~temp~0#1.base|)) |c_#length|) (= |c_#memory_$Pointer$.offset| (store |c_old(#memory_$Pointer$.offset)| |node_create_~temp~0#1.base| (select |c_#memory_$Pointer$.offset| |node_create_~temp~0#1.base|))) (= |c_#memory_$Pointer$.base| (store |c_old(#memory_$Pointer$.base)| |node_create_~temp~0#1.base| (select |c_#memory_$Pointer$.base| |node_create_~temp~0#1.base|))) (= 0 (select |c_old(#valid)| |node_create_~temp~0#1.base|)))) is different from true [2023-11-23 21:09:09,086 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-23 21:09:09,087 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 27 treesize of output 20 [2023-11-23 21:09:09,123 INFO L349 Elim1Store]: treesize reduction 4, result has 66.7 percent of original size [2023-11-23 21:09:09,124 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 15 treesize of output 15 [2023-11-23 21:09:09,134 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-23 21:09:09,135 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 11 [2023-11-23 21:09:09,143 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 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 18 treesize of output 13 [2023-11-23 21:09:09,218 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 17 treesize of output 9 [2023-11-23 21:09:09,229 INFO L134 CoverageAnalysis]: Checked inductivity of 21 backedges. 14 proven. 3 refuted. 0 times theorem prover too weak. 3 trivial. 1 not checked. [2023-11-23 21:09:09,229 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-23 21:09:09,633 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [110671688] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:09:09,633 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1629803779] [2023-11-23 21:09:09,636 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-11-23 21:09:09,637 INFO L166 IcfgInterpreter]: Building call graph [2023-11-23 21:09:09,637 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-23 21:09:09,637 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-23 21:09:09,637 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-23 21:09:11,473 INFO L197 IcfgInterpreter]: Interpreting procedure node_create with input of size 144 for LOIs [2023-11-23 21:09:12,038 INFO L180 IcfgInterpreter]: Interpretation finished