./Ultimate.py --spec ../../sv-benchmarks/c/properties/valid-memsafety.prp --file ../../sv-benchmarks/c/list-simple/sll2c_append_equal.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for memory safety (deref-memtrack) Using default analysis Version e7bb482b 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_7942cc55-cebf-4d62-8f52-45fbb444071f/bin/utaipan-verify-FOvIYxoinp/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7942cc55-cebf-4d62-8f52-45fbb444071f/bin/utaipan-verify-FOvIYxoinp/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7942cc55-cebf-4d62-8f52-45fbb444071f/bin/utaipan-verify-FOvIYxoinp/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7942cc55-cebf-4d62-8f52-45fbb444071f/bin/utaipan-verify-FOvIYxoinp/config/TaipanMemDerefMemtrack.xml -i ../../sv-benchmarks/c/list-simple/sll2c_append_equal.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7942cc55-cebf-4d62-8f52-45fbb444071f/bin/utaipan-verify-FOvIYxoinp/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7942cc55-cebf-4d62-8f52-45fbb444071f/bin/utaipan-verify-FOvIYxoinp --witnessprinter.witness.filename witness.graphml --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 b335af75f55d322161e6a270bf4669ab290ae0e9da4bc480724c7d5e3b79fdab --- Real Ultimate output --- This is Ultimate 0.2.3-dev-e7bb482 [2023-11-06 20:34:43,103 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-11-06 20:34:43,173 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7942cc55-cebf-4d62-8f52-45fbb444071f/bin/utaipan-verify-FOvIYxoinp/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Default.epf [2023-11-06 20:34:43,179 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-11-06 20:34:43,180 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-11-06 20:34:43,206 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-11-06 20:34:43,207 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-11-06 20:34:43,207 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-11-06 20:34:43,208 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-11-06 20:34:43,209 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-11-06 20:34:43,210 INFO L153 SettingsManager]: * User list type=DISABLED [2023-11-06 20:34:43,210 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-11-06 20:34:43,211 INFO L153 SettingsManager]: * Explicit value domain=true [2023-11-06 20:34:43,212 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-11-06 20:34:43,213 INFO L153 SettingsManager]: * Octagon Domain=false [2023-11-06 20:34:43,213 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-11-06 20:34:43,214 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-11-06 20:34:43,214 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-11-06 20:34:43,215 INFO L153 SettingsManager]: * Interval Domain=false [2023-11-06 20:34:43,216 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-11-06 20:34:43,217 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-11-06 20:34:43,217 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2023-11-06 20:34:43,218 INFO L151 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2023-11-06 20:34:43,219 INFO L153 SettingsManager]: * Create parallel compositions if possible=false [2023-11-06 20:34:43,220 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-11-06 20:34:43,220 INFO L153 SettingsManager]: * sizeof long=4 [2023-11-06 20:34:43,221 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-11-06 20:34:43,222 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-11-06 20:34:43,222 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-11-06 20:34:43,223 INFO L153 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2023-11-06 20:34:43,224 INFO L153 SettingsManager]: * Bitprecise bitfields=true [2023-11-06 20:34:43,224 INFO L153 SettingsManager]: * SV-COMP memtrack compatibility mode=true [2023-11-06 20:34:43,225 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-11-06 20:34:43,226 INFO L153 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2023-11-06 20:34:43,226 INFO L153 SettingsManager]: * Check unreachability of reach_error function=false [2023-11-06 20:34:43,227 INFO L153 SettingsManager]: * sizeof long double=12 [2023-11-06 20:34:43,228 INFO L153 SettingsManager]: * Use constant arrays=true [2023-11-06 20:34:43,228 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-11-06 20:34:43,229 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-11-06 20:34:43,230 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-06 20:34:43,230 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-11-06 20:34:43,231 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-11-06 20:34:43,232 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-11-06 20:34:43,232 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-11-06 20:34:43,233 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-11-06 20:34:43,233 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-11-06 20:34:43,234 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_7942cc55-cebf-4d62-8f52-45fbb444071f/bin/utaipan-verify-FOvIYxoinp/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7942cc55-cebf-4d62-8f52-45fbb444071f/bin/utaipan-verify-FOvIYxoinp Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness.graphml Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> b335af75f55d322161e6a270bf4669ab290ae0e9da4bc480724c7d5e3b79fdab [2023-11-06 20:34:43,475 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-11-06 20:34:43,498 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-11-06 20:34:43,501 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-11-06 20:34:43,502 INFO L270 PluginConnector]: Initializing CDTParser... [2023-11-06 20:34:43,503 INFO L274 PluginConnector]: CDTParser initialized [2023-11-06 20:34:43,504 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7942cc55-cebf-4d62-8f52-45fbb444071f/bin/utaipan-verify-FOvIYxoinp/../../sv-benchmarks/c/list-simple/sll2c_append_equal.i [2023-11-06 20:34:46,617 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-11-06 20:34:46,955 INFO L384 CDTParser]: Found 1 translation units. [2023-11-06 20:34:46,955 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7942cc55-cebf-4d62-8f52-45fbb444071f/sv-benchmarks/c/list-simple/sll2c_append_equal.i [2023-11-06 20:34:46,974 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7942cc55-cebf-4d62-8f52-45fbb444071f/bin/utaipan-verify-FOvIYxoinp/data/f6150bb97/039855f315c14168a928482d9cc717d9/FLAG29ab65f05 [2023-11-06 20:34:46,997 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7942cc55-cebf-4d62-8f52-45fbb444071f/bin/utaipan-verify-FOvIYxoinp/data/f6150bb97/039855f315c14168a928482d9cc717d9 [2023-11-06 20:34:47,000 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-11-06 20:34:47,002 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-11-06 20:34:47,003 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-11-06 20:34:47,003 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-11-06 20:34:47,009 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-11-06 20:34:47,010 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.11 08:34:46" (1/1) ... [2023-11-06 20:34:47,011 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@f3cf312 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 08:34:47, skipping insertion in model container [2023-11-06 20:34:47,011 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 06.11 08:34:46" (1/1) ... [2023-11-06 20:34:47,058 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-11-06 20:34:47,491 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-06 20:34:47,507 INFO L202 MainTranslator]: Completed pre-run [2023-11-06 20:34:47,586 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-06 20:34:47,624 INFO L206 MainTranslator]: Completed translation [2023-11-06 20:34:47,624 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 08:34:47 WrapperNode [2023-11-06 20:34:47,625 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-11-06 20:34:47,626 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-11-06 20:34:47,627 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-11-06 20:34:47,627 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-11-06 20:34:47,636 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 08:34:47" (1/1) ... [2023-11-06 20:34:47,664 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 08:34:47" (1/1) ... [2023-11-06 20:34:47,696 INFO L138 Inliner]: procedures = 127, calls = 43, calls flagged for inlining = 7, calls inlined = 7, statements flattened = 148 [2023-11-06 20:34:47,697 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-11-06 20:34:47,698 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-11-06 20:34:47,698 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-11-06 20:34:47,698 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-11-06 20:34:47,709 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 08:34:47" (1/1) ... [2023-11-06 20:34:47,709 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 08:34:47" (1/1) ... [2023-11-06 20:34:47,714 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 08:34:47" (1/1) ... [2023-11-06 20:34:47,714 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 08:34:47" (1/1) ... [2023-11-06 20:34:47,725 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 08:34:47" (1/1) ... [2023-11-06 20:34:47,729 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 08:34:47" (1/1) ... [2023-11-06 20:34:47,733 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 08:34:47" (1/1) ... [2023-11-06 20:34:47,735 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 08:34:47" (1/1) ... [2023-11-06 20:34:47,739 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-11-06 20:34:47,740 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-11-06 20:34:47,741 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-11-06 20:34:47,741 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-11-06 20:34:47,742 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 08:34:47" (1/1) ... [2023-11-06 20:34:47,749 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-06 20:34:47,766 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7942cc55-cebf-4d62-8f52-45fbb444071f/bin/utaipan-verify-FOvIYxoinp/z3 [2023-11-06 20:34:47,781 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7942cc55-cebf-4d62-8f52-45fbb444071f/bin/utaipan-verify-FOvIYxoinp/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-11-06 20:34:47,804 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7942cc55-cebf-4d62-8f52-45fbb444071f/bin/utaipan-verify-FOvIYxoinp/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-11-06 20:34:47,823 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-11-06 20:34:47,823 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-11-06 20:34:47,824 INFO L130 BoogieDeclarations]: Found specification of procedure node_create [2023-11-06 20:34:47,824 INFO L138 BoogieDeclarations]: Found implementation of procedure node_create [2023-11-06 20:34:47,824 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2023-11-06 20:34:47,824 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-11-06 20:34:47,824 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2023-11-06 20:34:47,825 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2023-11-06 20:34:47,827 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2023-11-06 20:34:47,827 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-11-06 20:34:47,828 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~$Pointer$ [2023-11-06 20:34:47,828 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-11-06 20:34:47,828 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-11-06 20:34:47,829 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-11-06 20:34:47,987 INFO L236 CfgBuilder]: Building ICFG [2023-11-06 20:34:47,989 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2023-11-06 20:34:48,495 INFO L277 CfgBuilder]: Performing block encoding [2023-11-06 20:34:48,563 INFO L297 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-11-06 20:34:48,564 INFO L302 CfgBuilder]: Removed 4 assume(true) statements. [2023-11-06 20:34:48,567 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.11 08:34:48 BoogieIcfgContainer [2023-11-06 20:34:48,568 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-11-06 20:34:48,589 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-11-06 20:34:48,589 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-11-06 20:34:48,593 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-11-06 20:34:48,593 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 06.11 08:34:46" (1/3) ... [2023-11-06 20:34:48,594 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@86d1735 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.11 08:34:48, skipping insertion in model container [2023-11-06 20:34:48,595 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 06.11 08:34:47" (2/3) ... [2023-11-06 20:34:48,595 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@86d1735 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 06.11 08:34:48, skipping insertion in model container [2023-11-06 20:34:48,595 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 06.11 08:34:48" (3/3) ... [2023-11-06 20:34:48,597 INFO L112 eAbstractionObserver]: Analyzing ICFG sll2c_append_equal.i [2023-11-06 20:34:48,640 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-11-06 20:34:48,640 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 50 error locations. [2023-11-06 20:34:48,694 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-11-06 20:34:48,702 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;@46718177, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-11-06 20:34:48,702 INFO L358 AbstractCegarLoop]: Starting to check reachability of 50 error locations. [2023-11-06 20:34:48,707 INFO L276 IsEmpty]: Start isEmpty. Operand has 104 states, 49 states have (on average 2.2653061224489797) internal successors, (111), 99 states have internal predecessors, (111), 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) [2023-11-06 20:34:48,715 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2023-11-06 20:34:48,715 INFO L187 NwaCegarLoop]: Found error trace [2023-11-06 20:34:48,716 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1] [2023-11-06 20:34:48,717 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting node_createErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 47 more)] === [2023-11-06 20:34:48,723 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 20:34:48,724 INFO L85 PathProgramCache]: Analyzing trace with hash 223906366, now seen corresponding path program 1 times [2023-11-06 20:34:48,736 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-06 20:34:48,736 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1007866423] [2023-11-06 20:34:48,737 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 20:34:48,737 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 20:34:48,900 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 20:34:49,102 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-06 20:34:49,103 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-06 20:34:49,103 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1007866423] [2023-11-06 20:34:49,104 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1007866423] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-06 20:34:49,104 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-06 20:34:49,105 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-11-06 20:34:49,107 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [674644758] [2023-11-06 20:34:49,107 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-06 20:34:49,112 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-06 20:34:49,114 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-06 20:34:49,146 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-06 20:34:49,147 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-06 20:34:49,150 INFO L87 Difference]: Start difference. First operand has 104 states, 49 states have (on average 2.2653061224489797) internal successors, (111), 99 states have internal predecessors, (111), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Second operand has 3 states, 2 states have (on average 2.0) internal successors, (4), 3 states have internal predecessors, (4), 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) [2023-11-06 20:34:49,299 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-06 20:34:49,300 INFO L93 Difference]: Finished difference Result 101 states and 110 transitions. [2023-11-06 20:34:49,301 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-06 20:34:49,302 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 2.0) internal successors, (4), 3 states have internal predecessors, (4), 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 5 [2023-11-06 20:34:49,303 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-06 20:34:49,311 INFO L225 Difference]: With dead ends: 101 [2023-11-06 20:34:49,311 INFO L226 Difference]: Without dead ends: 99 [2023-11-06 20:34:49,313 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 [2023-11-06 20:34:49,317 INFO L413 NwaCegarLoop]: 90 mSDtfsCounter, 6 mSDsluCounter, 51 mSDsCounter, 0 mSdLazyCounter, 71 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 141 SdHoareTripleChecker+Invalid, 72 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 71 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-06 20:34:49,318 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [6 Valid, 141 Invalid, 72 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 71 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-06 20:34:49,333 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 99 states. [2023-11-06 20:34:49,354 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 99 to 99. [2023-11-06 20:34:49,356 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 99 states, 47 states have (on average 2.148936170212766) internal successors, (101), 94 states have internal predecessors, (101), 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) [2023-11-06 20:34:49,358 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99 states to 99 states and 107 transitions. [2023-11-06 20:34:49,359 INFO L78 Accepts]: Start accepts. Automaton has 99 states and 107 transitions. Word has length 5 [2023-11-06 20:34:49,360 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-06 20:34:49,360 INFO L495 AbstractCegarLoop]: Abstraction has 99 states and 107 transitions. [2023-11-06 20:34:49,360 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 2.0) internal successors, (4), 3 states have internal predecessors, (4), 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) [2023-11-06 20:34:49,360 INFO L276 IsEmpty]: Start isEmpty. Operand 99 states and 107 transitions. [2023-11-06 20:34:49,361 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2023-11-06 20:34:49,361 INFO L187 NwaCegarLoop]: Found error trace [2023-11-06 20:34:49,361 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1] [2023-11-06 20:34:49,361 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-11-06 20:34:49,362 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting node_createErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 47 more)] === [2023-11-06 20:34:49,362 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 20:34:49,362 INFO L85 PathProgramCache]: Analyzing trace with hash 223906367, now seen corresponding path program 1 times [2023-11-06 20:34:49,363 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-06 20:34:49,363 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [746628114] [2023-11-06 20:34:49,363 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 20:34:49,363 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 20:34:49,392 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 20:34:49,541 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-06 20:34:49,541 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-06 20:34:49,541 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [746628114] [2023-11-06 20:34:49,542 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [746628114] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-06 20:34:49,542 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-06 20:34:49,542 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-11-06 20:34:49,542 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1586328421] [2023-11-06 20:34:49,543 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-06 20:34:49,544 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-06 20:34:49,544 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-06 20:34:49,545 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-06 20:34:49,545 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-06 20:34:49,545 INFO L87 Difference]: Start difference. First operand 99 states and 107 transitions. Second operand has 3 states, 2 states have (on average 2.0) internal successors, (4), 3 states have internal predecessors, (4), 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) [2023-11-06 20:34:49,678 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-06 20:34:49,678 INFO L93 Difference]: Finished difference Result 97 states and 105 transitions. [2023-11-06 20:34:49,678 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-06 20:34:49,679 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 2.0) internal successors, (4), 3 states have internal predecessors, (4), 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 5 [2023-11-06 20:34:49,679 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-06 20:34:49,680 INFO L225 Difference]: With dead ends: 97 [2023-11-06 20:34:49,680 INFO L226 Difference]: Without dead ends: 97 [2023-11-06 20:34:49,681 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 [2023-11-06 20:34:49,682 INFO L413 NwaCegarLoop]: 89 mSDtfsCounter, 2 mSDsluCounter, 57 mSDsCounter, 0 mSdLazyCounter, 60 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 146 SdHoareTripleChecker+Invalid, 61 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 60 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-06 20:34:49,683 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [2 Valid, 146 Invalid, 61 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 60 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-06 20:34:49,684 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 97 states. [2023-11-06 20:34:49,691 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 97 to 97. [2023-11-06 20:34:49,691 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 97 states, 47 states have (on average 2.106382978723404) internal successors, (99), 92 states have internal predecessors, (99), 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) [2023-11-06 20:34:49,701 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 97 states to 97 states and 105 transitions. [2023-11-06 20:34:49,701 INFO L78 Accepts]: Start accepts. Automaton has 97 states and 105 transitions. Word has length 5 [2023-11-06 20:34:49,701 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-06 20:34:49,701 INFO L495 AbstractCegarLoop]: Abstraction has 97 states and 105 transitions. [2023-11-06 20:34:49,701 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 2.0) internal successors, (4), 3 states have internal predecessors, (4), 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) [2023-11-06 20:34:49,702 INFO L276 IsEmpty]: Start isEmpty. Operand 97 states and 105 transitions. [2023-11-06 20:34:49,702 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2023-11-06 20:34:49,703 INFO L187 NwaCegarLoop]: Found error trace [2023-11-06 20:34:49,703 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-06 20:34:49,703 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2023-11-06 20:34:49,703 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 47 more)] === [2023-11-06 20:34:49,704 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 20:34:49,704 INFO L85 PathProgramCache]: Analyzing trace with hash 2048449616, now seen corresponding path program 1 times [2023-11-06 20:34:49,705 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-06 20:34:49,705 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1026621597] [2023-11-06 20:34:49,705 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 20:34:49,706 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 20:34:49,746 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 20:34:49,861 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-06 20:34:49,861 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-06 20:34:49,862 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1026621597] [2023-11-06 20:34:49,862 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1026621597] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-06 20:34:49,862 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-06 20:34:49,863 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-11-06 20:34:49,863 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [502203035] [2023-11-06 20:34:49,863 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-06 20:34:49,864 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-06 20:34:49,864 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-06 20:34:49,865 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-06 20:34:49,866 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-06 20:34:49,866 INFO L87 Difference]: Start difference. First operand 97 states and 105 transitions. Second operand has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 3 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) [2023-11-06 20:34:49,939 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-06 20:34:49,940 INFO L93 Difference]: Finished difference Result 98 states and 106 transitions. [2023-11-06 20:34:49,941 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-06 20:34:49,941 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 3 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 [2023-11-06 20:34:49,942 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-06 20:34:49,950 INFO L225 Difference]: With dead ends: 98 [2023-11-06 20:34:49,950 INFO L226 Difference]: Without dead ends: 98 [2023-11-06 20:34:49,951 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-06 20:34:49,952 INFO L413 NwaCegarLoop]: 90 mSDtfsCounter, 4 mSDsluCounter, 84 mSDsCounter, 0 mSdLazyCounter, 28 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 174 SdHoareTripleChecker+Invalid, 29 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 28 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-06 20:34:49,953 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [5 Valid, 174 Invalid, 29 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 28 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-06 20:34:49,954 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 98 states. [2023-11-06 20:34:49,972 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 98 to 98. [2023-11-06 20:34:49,974 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 98 states, 48 states have (on average 2.0833333333333335) internal successors, (100), 93 states have internal predecessors, (100), 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) [2023-11-06 20:34:49,976 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 98 states to 98 states and 106 transitions. [2023-11-06 20:34:49,976 INFO L78 Accepts]: Start accepts. Automaton has 98 states and 106 transitions. Word has length 10 [2023-11-06 20:34:49,979 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-06 20:34:49,979 INFO L495 AbstractCegarLoop]: Abstraction has 98 states and 106 transitions. [2023-11-06 20:34:49,980 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 3 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) [2023-11-06 20:34:49,980 INFO L276 IsEmpty]: Start isEmpty. Operand 98 states and 106 transitions. [2023-11-06 20:34:49,981 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2023-11-06 20:34:49,981 INFO L187 NwaCegarLoop]: Found error trace [2023-11-06 20:34:49,981 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-06 20:34:49,981 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2023-11-06 20:34:49,982 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 47 more)] === [2023-11-06 20:34:49,982 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 20:34:49,982 INFO L85 PathProgramCache]: Analyzing trace with hash -2099234649, now seen corresponding path program 1 times [2023-11-06 20:34:49,983 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-06 20:34:49,983 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1784920367] [2023-11-06 20:34:49,984 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 20:34:49,984 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 20:34:50,032 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 20:34:50,215 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-11-06 20:34:50,215 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-06 20:34:50,215 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1784920367] [2023-11-06 20:34:50,216 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1784920367] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-06 20:34:50,216 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-06 20:34:50,216 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2023-11-06 20:34:50,216 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1233129245] [2023-11-06 20:34:50,216 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-06 20:34:50,217 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-11-06 20:34:50,218 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-06 20:34:50,219 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-11-06 20:34:50,219 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-11-06 20:34:50,220 INFO L87 Difference]: Start difference. First operand 98 states and 106 transitions. Second operand has 6 states, 4 states have (on average 2.75) internal successors, (11), 5 states have internal predecessors, (11), 1 states have call successors, (2), 1 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2023-11-06 20:34:50,468 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-06 20:34:50,468 INFO L93 Difference]: Finished difference Result 97 states and 105 transitions. [2023-11-06 20:34:50,469 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-11-06 20:34:50,469 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 4 states have (on average 2.75) internal successors, (11), 5 states have internal predecessors, (11), 1 states have call successors, (2), 1 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) Word has length 17 [2023-11-06 20:34:50,469 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-06 20:34:50,472 INFO L225 Difference]: With dead ends: 97 [2023-11-06 20:34:50,472 INFO L226 Difference]: Without dead ends: 97 [2023-11-06 20:34:50,473 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 [2023-11-06 20:34:50,485 INFO L413 NwaCegarLoop]: 86 mSDtfsCounter, 3 mSDsluCounter, 196 mSDsCounter, 0 mSdLazyCounter, 230 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 282 SdHoareTripleChecker+Invalid, 231 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 230 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-06 20:34:50,486 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [3 Valid, 282 Invalid, 231 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 230 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-06 20:34:50,487 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 97 states. [2023-11-06 20:34:50,493 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 97 to 97. [2023-11-06 20:34:50,494 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 97 states, 48 states have (on average 2.0625) internal successors, (99), 92 states have internal predecessors, (99), 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) [2023-11-06 20:34:50,495 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 97 states to 97 states and 105 transitions. [2023-11-06 20:34:50,495 INFO L78 Accepts]: Start accepts. Automaton has 97 states and 105 transitions. Word has length 17 [2023-11-06 20:34:50,496 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-06 20:34:50,496 INFO L495 AbstractCegarLoop]: Abstraction has 97 states and 105 transitions. [2023-11-06 20:34:50,496 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 4 states have (on average 2.75) internal successors, (11), 5 states have internal predecessors, (11), 1 states have call successors, (2), 1 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2023-11-06 20:34:50,502 INFO L276 IsEmpty]: Start isEmpty. Operand 97 states and 105 transitions. [2023-11-06 20:34:50,503 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2023-11-06 20:34:50,503 INFO L187 NwaCegarLoop]: Found error trace [2023-11-06 20:34:50,503 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-06 20:34:50,504 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2023-11-06 20:34:50,504 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 47 more)] === [2023-11-06 20:34:50,505 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 20:34:50,505 INFO L85 PathProgramCache]: Analyzing trace with hash -2099234648, now seen corresponding path program 1 times [2023-11-06 20:34:50,505 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-06 20:34:50,505 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [159529230] [2023-11-06 20:34:50,506 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 20:34:50,506 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 20:34:50,551 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 20:34:50,826 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-06 20:34:50,826 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-06 20:34:50,826 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [159529230] [2023-11-06 20:34:50,826 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [159529230] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-06 20:34:50,826 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-06 20:34:50,827 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2023-11-06 20:34:50,828 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [712786804] [2023-11-06 20:34:50,828 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-06 20:34:50,830 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-11-06 20:34:50,830 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-06 20:34:50,831 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-11-06 20:34:50,832 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-11-06 20:34:50,832 INFO L87 Difference]: Start difference. First operand 97 states and 105 transitions. Second operand has 6 states, 4 states have (on average 3.25) internal successors, (13), 5 states have internal predecessors, (13), 1 states have call successors, (2), 1 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2023-11-06 20:34:51,022 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-06 20:34:51,022 INFO L93 Difference]: Finished difference Result 96 states and 104 transitions. [2023-11-06 20:34:51,023 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-11-06 20:34:51,023 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 4 states have (on average 3.25) internal successors, (13), 5 states have internal predecessors, (13), 1 states have call successors, (2), 1 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) Word has length 17 [2023-11-06 20:34:51,023 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-06 20:34:51,024 INFO L225 Difference]: With dead ends: 96 [2023-11-06 20:34:51,024 INFO L226 Difference]: Without dead ends: 96 [2023-11-06 20:34:51,025 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 [2023-11-06 20:34:51,028 INFO L413 NwaCegarLoop]: 86 mSDtfsCounter, 1 mSDsluCounter, 220 mSDsCounter, 0 mSdLazyCounter, 202 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 306 SdHoareTripleChecker+Invalid, 202 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 202 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-06 20:34:51,033 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1 Valid, 306 Invalid, 202 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 202 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-06 20:34:51,034 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 96 states. [2023-11-06 20:34:51,039 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 96 to 96. [2023-11-06 20:34:51,044 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 96 states, 48 states have (on average 2.0416666666666665) internal successors, (98), 91 states have internal predecessors, (98), 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) [2023-11-06 20:34:51,045 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 96 states to 96 states and 104 transitions. [2023-11-06 20:34:51,046 INFO L78 Accepts]: Start accepts. Automaton has 96 states and 104 transitions. Word has length 17 [2023-11-06 20:34:51,047 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-06 20:34:51,047 INFO L495 AbstractCegarLoop]: Abstraction has 96 states and 104 transitions. [2023-11-06 20:34:51,047 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 4 states have (on average 3.25) internal successors, (13), 5 states have internal predecessors, (13), 1 states have call successors, (2), 1 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2023-11-06 20:34:51,047 INFO L276 IsEmpty]: Start isEmpty. Operand 96 states and 104 transitions. [2023-11-06 20:34:51,048 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2023-11-06 20:34:51,048 INFO L187 NwaCegarLoop]: Found error trace [2023-11-06 20:34:51,048 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-06 20:34:51,049 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2023-11-06 20:34:51,049 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 47 more)] === [2023-11-06 20:34:51,050 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 20:34:51,050 INFO L85 PathProgramCache]: Analyzing trace with hash 1270324585, now seen corresponding path program 1 times [2023-11-06 20:34:51,050 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-06 20:34:51,051 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1826964523] [2023-11-06 20:34:51,051 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 20:34:51,052 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 20:34:51,095 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 20:34:51,378 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 2 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-06 20:34:51,378 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-06 20:34:51,378 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1826964523] [2023-11-06 20:34:51,378 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1826964523] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-06 20:34:51,379 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1241833643] [2023-11-06 20:34:51,379 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 20:34:51,379 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 20:34:51,379 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7942cc55-cebf-4d62-8f52-45fbb444071f/bin/utaipan-verify-FOvIYxoinp/z3 [2023-11-06 20:34:51,384 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7942cc55-cebf-4d62-8f52-45fbb444071f/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-06 20:34:51,412 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7942cc55-cebf-4d62-8f52-45fbb444071f/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-11-06 20:34:51,528 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 20:34:51,531 INFO L262 TraceCheckSpWp]: Trace formula consists of 213 conjuncts, 17 conjunts are in the unsatisfiable core [2023-11-06 20:34:51,543 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-06 20:34:51,611 INFO L351 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 [2023-11-06 20:34:51,663 WARN L861 $PredicateComparison]: unable to prove that (exists ((|node_create_~temp~0#1.base| Int)) (and (= |c_#valid| (store |c_old(#valid)| |node_create_~temp~0#1.base| (select |c_#valid| |node_create_~temp~0#1.base|))) (= 0 (select |c_old(#valid)| |node_create_~temp~0#1.base|)))) is different from true [2023-11-06 20:34:51,729 INFO L322 Elim1Store]: treesize reduction 20, result has 33.3 percent of original size [2023-11-06 20:34:51,730 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 19 treesize of output 16 [2023-11-06 20:34:51,750 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 4 not checked. [2023-11-06 20:34:51,756 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-06 20:34:51,841 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1241833643] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-06 20:34:51,842 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [262718459] [2023-11-06 20:34:51,863 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-11-06 20:34:51,864 INFO L166 IcfgInterpreter]: Building call graph [2023-11-06 20:34:51,869 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-06 20:34:51,875 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-06 20:34:51,876 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-06 20:34:53,671 INFO L197 IcfgInterpreter]: Interpreting procedure node_create with input of size 59 for LOIs [2023-11-06 20:34:53,832 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-06 20:34:56,442 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1189#(and (not (= (select |#valid| |ULTIMATE.start_sll_circular_create_~last~0#1.base|) 1)) (<= 1 |#StackHeapBarrier|) (= |ULTIMATE.start_sll_circular_create_#in~data#1| 1) (= |ULTIMATE.start_sll_circular_create_~head~0#1.offset| 0) (= |ULTIMATE.start_sll_circular_create_~last~0#1.offset| 0) (= |ULTIMATE.start_sll_circular_create_~len#1| 1) (= |ULTIMATE.start_main_~data~0#1| 1) (= |ULTIMATE.start_main_~#s~0#1.offset| 0) (= |ULTIMATE.start_main_~len~0#1| 2) (= 2 |ULTIMATE.start_sll_circular_create_#in~len#1|) (<= 2 |ULTIMATE.start_main_~#s~0#1.base|) (= |ULTIMATE.start_sll_circular_create_~data#1| 1))' at error location [2023-11-06 20:34:56,443 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-06 20:34:56,443 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-11-06 20:34:56,443 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 7] total 10 [2023-11-06 20:34:56,443 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1061186765] [2023-11-06 20:34:56,444 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-11-06 20:34:56,444 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2023-11-06 20:34:56,444 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-06 20:34:56,445 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2023-11-06 20:34:56,446 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=76, Invalid=432, Unknown=2, NotChecked=42, Total=552 [2023-11-06 20:34:56,446 INFO L87 Difference]: Start difference. First operand 96 states and 104 transitions. Second operand has 11 states, 8 states have (on average 2.375) internal successors, (19), 9 states have internal predecessors, (19), 2 states have call successors, (2), 2 states have call predecessors, (2), 3 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2023-11-06 20:34:56,889 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-06 20:34:56,889 INFO L93 Difference]: Finished difference Result 95 states and 103 transitions. [2023-11-06 20:34:56,890 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-11-06 20:34:56,890 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 8 states have (on average 2.375) internal successors, (19), 9 states have internal predecessors, (19), 2 states have call successors, (2), 2 states have call predecessors, (2), 3 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 19 [2023-11-06 20:34:56,891 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-06 20:34:56,891 INFO L225 Difference]: With dead ends: 95 [2023-11-06 20:34:56,892 INFO L226 Difference]: Without dead ends: 95 [2023-11-06 20:34:56,892 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 30 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 105 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=94, Invalid=508, Unknown=2, NotChecked=46, Total=650 [2023-11-06 20:34:56,895 INFO L413 NwaCegarLoop]: 82 mSDtfsCounter, 5 mSDsluCounter, 321 mSDsCounter, 0 mSdLazyCounter, 383 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 403 SdHoareTripleChecker+Invalid, 484 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 383 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 98 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-11-06 20:34:56,895 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [5 Valid, 403 Invalid, 484 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 383 Invalid, 0 Unknown, 98 Unchecked, 0.3s Time] [2023-11-06 20:34:56,897 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 95 states. [2023-11-06 20:34:56,909 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 95 to 95. [2023-11-06 20:34:56,913 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 95 states, 48 states have (on average 2.0208333333333335) internal successors, (97), 90 states have internal predecessors, (97), 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) [2023-11-06 20:34:56,914 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 95 states to 95 states and 103 transitions. [2023-11-06 20:34:56,914 INFO L78 Accepts]: Start accepts. Automaton has 95 states and 103 transitions. Word has length 19 [2023-11-06 20:34:56,915 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-06 20:34:56,915 INFO L495 AbstractCegarLoop]: Abstraction has 95 states and 103 transitions. [2023-11-06 20:34:56,915 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 8 states have (on average 2.375) internal successors, (19), 9 states have internal predecessors, (19), 2 states have call successors, (2), 2 states have call predecessors, (2), 3 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2023-11-06 20:34:56,916 INFO L276 IsEmpty]: Start isEmpty. Operand 95 states and 103 transitions. [2023-11-06 20:34:56,916 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2023-11-06 20:34:56,917 INFO L187 NwaCegarLoop]: Found error trace [2023-11-06 20:34:56,917 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-06 20:34:56,931 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7942cc55-cebf-4d62-8f52-45fbb444071f/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-11-06 20:34:57,124 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7942cc55-cebf-4d62-8f52-45fbb444071f/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2023-11-06 20:34:57,124 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 47 more)] === [2023-11-06 20:34:57,125 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 20:34:57,125 INFO L85 PathProgramCache]: Analyzing trace with hash 1270324586, now seen corresponding path program 1 times [2023-11-06 20:34:57,125 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-06 20:34:57,125 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [879582602] [2023-11-06 20:34:57,125 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 20:34:57,126 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 20:34:57,154 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 20:34:57,556 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 1 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-06 20:34:57,556 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-06 20:34:57,557 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [879582602] [2023-11-06 20:34:57,557 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [879582602] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-06 20:34:57,557 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1411236058] [2023-11-06 20:34:57,557 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 20:34:57,557 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 20:34:57,558 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7942cc55-cebf-4d62-8f52-45fbb444071f/bin/utaipan-verify-FOvIYxoinp/z3 [2023-11-06 20:34:57,559 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7942cc55-cebf-4d62-8f52-45fbb444071f/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-06 20:34:57,588 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7942cc55-cebf-4d62-8f52-45fbb444071f/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-11-06 20:34:57,694 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 20:34:57,696 INFO L262 TraceCheckSpWp]: Trace formula consists of 213 conjuncts, 29 conjunts are in the unsatisfiable core [2023-11-06 20:34:57,700 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-06 20:34:57,704 INFO L351 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 [2023-11-06 20:34:57,837 WARN L861 $PredicateComparison]: unable to prove that (exists ((|node_create_~temp~0#1.base| Int)) (and (= (store |c_old(#length)| |node_create_~temp~0#1.base| (select |c_#length| |node_create_~temp~0#1.base|)) |c_#length|) (= 0 (select |c_old(#valid)| |node_create_~temp~0#1.base|)))) is different from true [2023-11-06 20:34:57,867 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-06 20:34:57,869 INFO L351 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 16 treesize of output 11 [2023-11-06 20:34:57,882 INFO L322 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2023-11-06 20:34:57,883 INFO L351 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 11 treesize of output 11 [2023-11-06 20:34:57,918 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 4 not checked. [2023-11-06 20:34:57,919 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-06 20:34:58,066 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1411236058] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-06 20:34:58,067 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [862938810] [2023-11-06 20:34:58,070 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-11-06 20:34:58,070 INFO L166 IcfgInterpreter]: Building call graph [2023-11-06 20:34:58,071 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-06 20:34:58,071 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-06 20:34:58,071 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-06 20:34:59,086 INFO L197 IcfgInterpreter]: Interpreting procedure node_create with input of size 59 for LOIs [2023-11-06 20:34:59,206 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-06 20:35:02,155 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1483#(and (<= 1 |#StackHeapBarrier|) (= |ULTIMATE.start_sll_circular_create_#in~data#1| 1) (= |ULTIMATE.start_sll_circular_create_~head~0#1.offset| 0) (= |ULTIMATE.start_sll_circular_create_~last~0#1.offset| 0) (<= (select |#length| |ULTIMATE.start_sll_circular_create_~last~0#1.base|) 3) (<= |ULTIMATE.start_sll_circular_create_~len#1| 1) (= |ULTIMATE.start_main_~data~0#1| 1) (= |ULTIMATE.start_main_~#s~0#1.offset| 0) (= |ULTIMATE.start_main_~len~0#1| 2) (= 2 |ULTIMATE.start_sll_circular_create_#in~len#1|) (<= 2 |ULTIMATE.start_main_~#s~0#1.base|) (= |ULTIMATE.start_sll_circular_create_~data#1| 1))' at error location [2023-11-06 20:35:02,155 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-06 20:35:02,155 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-11-06 20:35:02,155 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 8] total 16 [2023-11-06 20:35:02,156 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1668726825] [2023-11-06 20:35:02,156 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-11-06 20:35:02,156 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2023-11-06 20:35:02,156 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-06 20:35:02,157 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2023-11-06 20:35:02,158 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=105, Invalid=768, Unknown=1, NotChecked=56, Total=930 [2023-11-06 20:35:02,158 INFO L87 Difference]: Start difference. First operand 95 states and 103 transitions. Second operand has 17 states, 13 states have (on average 2.230769230769231) internal successors, (29), 14 states have internal predecessors, (29), 3 states have call successors, (3), 2 states have call predecessors, (3), 4 states have return successors, (4), 4 states have call predecessors, (4), 3 states have call successors, (4) [2023-11-06 20:35:02,777 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-06 20:35:02,777 INFO L93 Difference]: Finished difference Result 95 states and 104 transitions. [2023-11-06 20:35:02,777 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2023-11-06 20:35:02,778 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 13 states have (on average 2.230769230769231) internal successors, (29), 14 states have internal predecessors, (29), 3 states have call successors, (3), 2 states have call predecessors, (3), 4 states have return successors, (4), 4 states have call predecessors, (4), 3 states have call successors, (4) Word has length 19 [2023-11-06 20:35:02,778 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-06 20:35:02,780 INFO L225 Difference]: With dead ends: 95 [2023-11-06 20:35:02,780 INFO L226 Difference]: Without dead ends: 95 [2023-11-06 20:35:02,781 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 23 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 219 ImplicationChecksByTransitivity, 3.3s TimeCoverageRelationStatistics Valid=126, Invalid=869, Unknown=1, NotChecked=60, Total=1056 [2023-11-06 20:35:02,782 INFO L413 NwaCegarLoop]: 82 mSDtfsCounter, 7 mSDsluCounter, 345 mSDsCounter, 0 mSdLazyCounter, 463 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 427 SdHoareTripleChecker+Invalid, 572 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 463 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 100 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2023-11-06 20:35:02,782 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [7 Valid, 427 Invalid, 572 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 463 Invalid, 0 Unknown, 100 Unchecked, 0.5s Time] [2023-11-06 20:35:02,783 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 95 states. [2023-11-06 20:35:02,787 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 95 to 94. [2023-11-06 20:35:02,787 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 94 states, 48 states have (on average 2.0) internal successors, (96), 89 states have internal predecessors, (96), 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) [2023-11-06 20:35:02,792 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 94 states to 94 states and 102 transitions. [2023-11-06 20:35:02,793 INFO L78 Accepts]: Start accepts. Automaton has 94 states and 102 transitions. Word has length 19 [2023-11-06 20:35:02,793 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-06 20:35:02,793 INFO L495 AbstractCegarLoop]: Abstraction has 94 states and 102 transitions. [2023-11-06 20:35:02,793 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 13 states have (on average 2.230769230769231) internal successors, (29), 14 states have internal predecessors, (29), 3 states have call successors, (3), 2 states have call predecessors, (3), 4 states have return successors, (4), 4 states have call predecessors, (4), 3 states have call successors, (4) [2023-11-06 20:35:02,794 INFO L276 IsEmpty]: Start isEmpty. Operand 94 states and 102 transitions. [2023-11-06 20:35:02,795 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2023-11-06 20:35:02,795 INFO L187 NwaCegarLoop]: Found error trace [2023-11-06 20:35:02,795 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-06 20:35:02,806 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7942cc55-cebf-4d62-8f52-45fbb444071f/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Ended with exit code 0 [2023-11-06 20:35:03,001 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7942cc55-cebf-4d62-8f52-45fbb444071f/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 20:35:03,002 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr4REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 47 more)] === [2023-11-06 20:35:03,002 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 20:35:03,002 INFO L85 PathProgramCache]: Analyzing trace with hash 2102056431, now seen corresponding path program 1 times [2023-11-06 20:35:03,003 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-06 20:35:03,003 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [72104775] [2023-11-06 20:35:03,003 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 20:35:03,003 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 20:35:03,040 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 20:35:03,608 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 13 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-11-06 20:35:03,608 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-06 20:35:03,608 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [72104775] [2023-11-06 20:35:03,608 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [72104775] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-06 20:35:03,608 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1262537057] [2023-11-06 20:35:03,608 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 20:35:03,609 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 20:35:03,609 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7942cc55-cebf-4d62-8f52-45fbb444071f/bin/utaipan-verify-FOvIYxoinp/z3 [2023-11-06 20:35:03,610 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7942cc55-cebf-4d62-8f52-45fbb444071f/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-06 20:35:03,614 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7942cc55-cebf-4d62-8f52-45fbb444071f/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-11-06 20:35:03,762 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 20:35:03,765 INFO L262 TraceCheckSpWp]: Trace formula consists of 320 conjuncts, 30 conjunts are in the unsatisfiable core [2023-11-06 20:35:03,768 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-06 20:35:03,778 INFO L351 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 [2023-11-06 20:35:03,793 INFO L351 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 [2023-11-06 20:35:03,867 INFO L322 Elim1Store]: treesize reduction 20, result has 33.3 percent of original size [2023-11-06 20:35:03,867 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 19 treesize of output 16 [2023-11-06 20:35:03,913 INFO L351 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 [2023-11-06 20:35:03,923 WARN L861 $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 [2023-11-06 20:35:03,949 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-06 20:35:03,950 INFO L351 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 [2023-11-06 20:35:03,992 INFO L351 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 [2023-11-06 20:35:04,024 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-06 20:35:04,025 INFO L351 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 [2023-11-06 20:35:04,030 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 8 trivial. 8 not checked. [2023-11-06 20:35:04,030 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-06 20:35:04,108 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1262537057] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-06 20:35:04,109 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1553458384] [2023-11-06 20:35:04,111 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2023-11-06 20:35:04,111 INFO L166 IcfgInterpreter]: Building call graph [2023-11-06 20:35:04,112 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-06 20:35:04,112 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-06 20:35:04,112 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-06 20:35:05,319 INFO L197 IcfgInterpreter]: Interpreting procedure node_create with input of size 6 for LOIs [2023-11-06 20:35:05,341 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-06 20:35:08,215 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1793#(and (= |ULTIMATE.start_sll_circular_append_#in~head#1.offset| 0) (<= 1 |#StackHeapBarrier|) (= |ULTIMATE.start_sll_circular_append_#in~data#1| 1) (or (and (exists ((|v_#memory_int_76| (Array Int (Array Int Int))) (|v_#memory_int_77| (Array Int (Array Int Int)))) (and (= |v_#memory_int_77| (store |v_#memory_int_76| |ULTIMATE.start_sll_circular_append_~new_last~0#1.base| (store (select |v_#memory_int_76| |ULTIMATE.start_sll_circular_append_~new_last~0#1.base|) 0 (select (select |v_#memory_int_77| |ULTIMATE.start_sll_circular_append_~new_last~0#1.base|) 0)))) (= |#memory_int| (store |v_#memory_int_77| |ULTIMATE.start_sll_circular_append_~new_last~0#1.base| (store (select |v_#memory_int_77| |ULTIMATE.start_sll_circular_append_~new_last~0#1.base|) 4 1))))) (<= 8 (select |#length| |ULTIMATE.start_sll_circular_append_~new_last~0#1.base|)) (= |ULTIMATE.start_sll_circular_append_~head#1.base| |ULTIMATE.start_sll_circular_append_#in~head#1.base|) (= (select |#valid| |ULTIMATE.start_sll_circular_append_~new_last~0#1.base|) 1) (exists ((|v_#memory_$Pointer$.base_101| (Array Int (Array Int Int)))) (= |#memory_$Pointer$.base| (store |v_#memory_$Pointer$.base_101| |ULTIMATE.start_sll_circular_append_~new_last~0#1.base| (store (store (select |v_#memory_$Pointer$.base_101| |ULTIMATE.start_sll_circular_append_~new_last~0#1.base|) 0 0) 4 (select (select |#memory_$Pointer$.base| |ULTIMATE.start_sll_circular_append_~new_last~0#1.base|) 4))))) (exists ((|v_#memory_$Pointer$.offset_101| (Array Int (Array Int Int)))) (= |#memory_$Pointer$.offset| (store |v_#memory_$Pointer$.offset_101| |ULTIMATE.start_sll_circular_append_~new_last~0#1.base| (store (store (select |v_#memory_$Pointer$.offset_101| |ULTIMATE.start_sll_circular_append_~new_last~0#1.base|) 0 0) 4 (select (select |#memory_$Pointer$.offset| |ULTIMATE.start_sll_circular_append_~new_last~0#1.base|) 4))))) (exists ((|v_#length_104| (Array Int Int))) (= (store |v_#length_104| |ULTIMATE.start_sll_circular_append_~new_last~0#1.base| 8) |#length|)) (exists ((|v_#memory_$Pointer$.offset_105| (Array Int (Array Int Int))) (|v_old(#valid)_AFTER_CALL_32| (Array Int Int)) (|v_#length_BEFORE_CALL_57| (Array Int Int)) (|v_#memory_$Pointer$.base_105| (Array Int (Array Int Int))) (|v_ULTIMATE.start_sll_circular_create_~last~0#1.base_15| Int) (|v_#memory_int_80| (Array Int (Array Int Int))) (|v_old(#memory_int)_AFTER_CALL_32| (Array Int (Array Int Int)))) (and (= |v_old(#memory_int)_AFTER_CALL_32| (store |v_#memory_int_80| |v_ULTIMATE.start_sll_circular_create_~last~0#1.base_15| (store (select |v_#memory_int_80| |v_ULTIMATE.start_sll_circular_create_~last~0#1.base_15|) 0 (select (select |v_old(#memory_int)_AFTER_CALL_32| |v_ULTIMATE.start_sll_circular_create_~last~0#1.base_15|) 0)))) (= (select (select (store |v_#memory_$Pointer$.base_105| |v_ULTIMATE.start_sll_circular_create_~last~0#1.base_15| (store (select |v_#memory_$Pointer$.base_105| |v_ULTIMATE.start_sll_circular_create_~last~0#1.base_15|) 0 |ULTIMATE.start_sll_circular_create_#res#1.base|)) |ULTIMATE.start_main_~#s~0#1.base|) 0) |ULTIMATE.start_sll_circular_create_#res#1.base|) (= (select |v_old(#valid)_AFTER_CALL_32| |v_ULTIMATE.start_sll_circular_create_~last~0#1.base_15|) 1) (= (select (select (store |v_#memory_$Pointer$.offset_105| |v_ULTIMATE.start_sll_circular_create_~last~0#1.base_15| (store (select |v_#memory_$Pointer$.offset_105| |v_ULTIMATE.start_sll_circular_create_~last~0#1.base_15|) 0 0)) |ULTIMATE.start_main_~#s~0#1.base|) 0) 0) (<= 4 (select |v_#length_BEFORE_CALL_57| |v_ULTIMATE.start_sll_circular_create_~last~0#1.base_15|)))) (not (= |ULTIMATE.start_sll_circular_append_~new_last~0#1.base| 0)) (= |ULTIMATE.start_sll_circular_append_#in~head#1.base| |ULTIMATE.start_main_~#s~0#1.base|) (<= (+ |ULTIMATE.start_sll_circular_append_~new_last~0#1.base| 1) |#StackHeapBarrier|) (exists ((|v_#valid_128| (Array Int Int))) (and (= (store |v_#valid_128| |ULTIMATE.start_sll_circular_append_~new_last~0#1.base| 1) |#valid|) (= (select |v_#valid_128| |ULTIMATE.start_sll_circular_append_~new_last~0#1.base|) 0)))) (and (exists ((|v_#memory_int_76| (Array Int (Array Int Int))) (|v_#memory_int_77| (Array Int (Array Int Int)))) (and (= |v_#memory_int_77| (store |v_#memory_int_76| |ULTIMATE.start_sll_circular_append_~new_last~0#1.base| (store (select |v_#memory_int_76| |ULTIMATE.start_sll_circular_append_~new_last~0#1.base|) 0 (select (select |v_#memory_int_77| |ULTIMATE.start_sll_circular_append_~new_last~0#1.base|) 0)))) (= |#memory_int| (store |v_#memory_int_77| |ULTIMATE.start_sll_circular_append_~new_last~0#1.base| (store (select |v_#memory_int_77| |ULTIMATE.start_sll_circular_append_~new_last~0#1.base|) 4 1))))) (<= 8 (select |#length| |ULTIMATE.start_sll_circular_append_~new_last~0#1.base|)) (= |ULTIMATE.start_sll_circular_append_~head#1.base| |ULTIMATE.start_sll_circular_append_#in~head#1.base|) (= (select |#valid| |ULTIMATE.start_sll_circular_append_~new_last~0#1.base|) 1) (exists ((|v_#memory_$Pointer$.base_101| (Array Int (Array Int Int)))) (= |#memory_$Pointer$.base| (store |v_#memory_$Pointer$.base_101| |ULTIMATE.start_sll_circular_append_~new_last~0#1.base| (store (store (select |v_#memory_$Pointer$.base_101| |ULTIMATE.start_sll_circular_append_~new_last~0#1.base|) 0 0) 4 (select (select |#memory_$Pointer$.base| |ULTIMATE.start_sll_circular_append_~new_last~0#1.base|) 4))))) (exists ((|v_#memory_$Pointer$.offset_101| (Array Int (Array Int Int)))) (= |#memory_$Pointer$.offset| (store |v_#memory_$Pointer$.offset_101| |ULTIMATE.start_sll_circular_append_~new_last~0#1.base| (store (store (select |v_#memory_$Pointer$.offset_101| |ULTIMATE.start_sll_circular_append_~new_last~0#1.base|) 0 0) 4 (select (select |#memory_$Pointer$.offset| |ULTIMATE.start_sll_circular_append_~new_last~0#1.base|) 4))))) (exists ((|v_#length_104| (Array Int Int))) (= (store |v_#length_104| |ULTIMATE.start_sll_circular_append_~new_last~0#1.base| 8) |#length|)) (not (= |ULTIMATE.start_sll_circular_append_~new_last~0#1.base| 0)) (exists ((|v_#length_BEFORE_CALL_59| (Array Int Int)) (|v_#memory_$Pointer$.offset_105| (Array Int (Array Int Int))) (|v_old(#valid)_AFTER_CALL_33| (Array Int Int)) (|v_#memory_$Pointer$.base_105| (Array Int (Array Int Int))) (|v_ULTIMATE.start_sll_circular_create_~last~0#1.base_15| Int) (|v_#memory_int_80| (Array Int (Array Int Int))) (|v_old(#memory_int)_AFTER_CALL_33| (Array Int (Array Int Int)))) (and (= (select (select (store |v_#memory_$Pointer$.base_105| |v_ULTIMATE.start_sll_circular_create_~last~0#1.base_15| (store (select |v_#memory_$Pointer$.base_105| |v_ULTIMATE.start_sll_circular_create_~last~0#1.base_15|) 0 |ULTIMATE.start_sll_circular_create_#res#1.base|)) |ULTIMATE.start_main_~#s~0#1.base|) 0) |ULTIMATE.start_sll_circular_create_#res#1.base|) (= (select (select (store |v_#memory_$Pointer$.offset_105| |v_ULTIMATE.start_sll_circular_create_~last~0#1.base_15| (store (select |v_#memory_$Pointer$.offset_105| |v_ULTIMATE.start_sll_circular_create_~last~0#1.base_15|) 0 0)) |ULTIMATE.start_main_~#s~0#1.base|) 0) 0) (<= 4 (select |v_#length_BEFORE_CALL_59| |v_ULTIMATE.start_sll_circular_create_~last~0#1.base_15|)) (= |v_old(#memory_int)_AFTER_CALL_33| (store |v_#memory_int_80| |v_ULTIMATE.start_sll_circular_create_~last~0#1.base_15| (store (select |v_#memory_int_80| |v_ULTIMATE.start_sll_circular_create_~last~0#1.base_15|) 0 (select (select |v_old(#memory_int)_AFTER_CALL_33| |v_ULTIMATE.start_sll_circular_create_~last~0#1.base_15|) 0)))) (= (select |v_old(#valid)_AFTER_CALL_33| |v_ULTIMATE.start_sll_circular_create_~last~0#1.base_15|) 1))) (= |ULTIMATE.start_sll_circular_append_#in~head#1.base| |ULTIMATE.start_main_~#s~0#1.base|) (<= (+ |ULTIMATE.start_sll_circular_append_~new_last~0#1.base| 1) |#StackHeapBarrier|) (exists ((|v_#valid_128| (Array Int Int))) (and (= (store |v_#valid_128| |ULTIMATE.start_sll_circular_append_~new_last~0#1.base| 1) |#valid|) (= (select |v_#valid_128| |ULTIMATE.start_sll_circular_append_~new_last~0#1.base|) 0))))) (= |ULTIMATE.start_sll_circular_create_#res#1.offset| 0) (<= 2 |ULTIMATE.start_sll_circular_append_~head#1.base|) (= |ULTIMATE.start_sll_circular_append_~data#1| 1) (= |ULTIMATE.start_sll_circular_append_~head#1.offset| 0) (not (= (select |#valid| |ULTIMATE.start_sll_circular_append_~head#1.base|) 1)) (= |ULTIMATE.start_sll_circular_append_~new_last~0#1.offset| 0) (<= 2 |ULTIMATE.start_sll_circular_append_#in~head#1.base|) (= |ULTIMATE.start_main_~data~0#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|))' at error location [2023-11-06 20:35:08,215 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-06 20:35:08,216 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-11-06 20:35:08,216 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 8] total 15 [2023-11-06 20:35:08,216 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [288189003] [2023-11-06 20:35:08,216 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-11-06 20:35:08,217 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2023-11-06 20:35:08,217 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-06 20:35:08,218 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2023-11-06 20:35:08,218 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=95, Invalid=895, Unknown=6, NotChecked=60, Total=1056 [2023-11-06 20:35:08,219 INFO L87 Difference]: Start difference. First operand 94 states and 102 transitions. Second operand has 17 states, 11 states have (on average 2.8181818181818183) internal successors, (31), 14 states have internal predecessors, (31), 3 states have call successors, (4), 1 states have call predecessors, (4), 5 states have return successors, (6), 4 states have call predecessors, (6), 3 states have call successors, (6) [2023-11-06 20:35:08,977 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-06 20:35:08,977 INFO L93 Difference]: Finished difference Result 103 states and 112 transitions. [2023-11-06 20:35:08,978 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2023-11-06 20:35:08,978 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 11 states have (on average 2.8181818181818183) internal successors, (31), 14 states have internal predecessors, (31), 3 states have call successors, (4), 1 states have call predecessors, (4), 5 states have return successors, (6), 4 states have call predecessors, (6), 3 states have call successors, (6) Word has length 27 [2023-11-06 20:35:08,978 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-06 20:35:08,979 INFO L225 Difference]: With dead ends: 103 [2023-11-06 20:35:08,979 INFO L226 Difference]: Without dead ends: 103 [2023-11-06 20:35:08,980 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 74 GetRequests, 40 SyntacticMatches, 0 SemanticMatches, 34 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 301 ImplicationChecksByTransitivity, 3.2s TimeCoverageRelationStatistics Valid=122, Invalid=1066, Unknown=6, NotChecked=66, Total=1260 [2023-11-06 20:35:08,981 INFO L413 NwaCegarLoop]: 37 mSDtfsCounter, 107 mSDsluCounter, 324 mSDsCounter, 0 mSdLazyCounter, 608 mSolverCounterSat, 10 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 107 SdHoareTripleChecker+Valid, 361 SdHoareTripleChecker+Invalid, 725 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 10 IncrementalHoareTripleChecker+Valid, 608 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 107 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2023-11-06 20:35:08,981 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [107 Valid, 361 Invalid, 725 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [10 Valid, 608 Invalid, 0 Unknown, 107 Unchecked, 0.6s Time] [2023-11-06 20:35:08,982 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 103 states. [2023-11-06 20:35:08,985 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 103 to 86. [2023-11-06 20:35:08,985 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 86 states, 48 states have (on average 1.8333333333333333) internal successors, (88), 81 states have internal predecessors, (88), 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) [2023-11-06 20:35:08,986 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 86 states to 86 states and 94 transitions. [2023-11-06 20:35:08,986 INFO L78 Accepts]: Start accepts. Automaton has 86 states and 94 transitions. Word has length 27 [2023-11-06 20:35:08,986 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-06 20:35:08,986 INFO L495 AbstractCegarLoop]: Abstraction has 86 states and 94 transitions. [2023-11-06 20:35:08,987 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 11 states have (on average 2.8181818181818183) internal successors, (31), 14 states have internal predecessors, (31), 3 states have call successors, (4), 1 states have call predecessors, (4), 5 states have return successors, (6), 4 states have call predecessors, (6), 3 states have call successors, (6) [2023-11-06 20:35:08,987 INFO L276 IsEmpty]: Start isEmpty. Operand 86 states and 94 transitions. [2023-11-06 20:35:08,987 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2023-11-06 20:35:08,988 INFO L187 NwaCegarLoop]: Found error trace [2023-11-06 20:35:08,988 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-06 20:35:09,006 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7942cc55-cebf-4d62-8f52-45fbb444071f/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2023-11-06 20:35:09,188 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7942cc55-cebf-4d62-8f52-45fbb444071f/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 20:35:09,189 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 47 more)] === [2023-11-06 20:35:09,189 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 20:35:09,189 INFO L85 PathProgramCache]: Analyzing trace with hash 2102056432, now seen corresponding path program 1 times [2023-11-06 20:35:09,189 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-06 20:35:09,189 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1337278992] [2023-11-06 20:35:09,189 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 20:35:09,189 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 20:35:09,232 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 20:35:09,765 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-11-06 20:35:09,765 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-06 20:35:09,765 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1337278992] [2023-11-06 20:35:09,765 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1337278992] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-06 20:35:09,766 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [134355870] [2023-11-06 20:35:09,766 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 20:35:09,766 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 20:35:09,766 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7942cc55-cebf-4d62-8f52-45fbb444071f/bin/utaipan-verify-FOvIYxoinp/z3 [2023-11-06 20:35:09,769 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7942cc55-cebf-4d62-8f52-45fbb444071f/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-06 20:35:09,788 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7942cc55-cebf-4d62-8f52-45fbb444071f/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-11-06 20:35:09,916 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 20:35:09,919 INFO L262 TraceCheckSpWp]: Trace formula consists of 320 conjuncts, 26 conjunts are in the unsatisfiable core [2023-11-06 20:35:09,924 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-06 20:35:09,961 INFO L351 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 [2023-11-06 20:35:09,993 INFO L351 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 [2023-11-06 20:35:10,001 WARN L861 $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 [2023-11-06 20:35:10,039 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-06 20:35:10,040 INFO L351 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 [2023-11-06 20:35:10,077 INFO L351 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 [2023-11-06 20:35:10,111 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-06 20:35:10,112 INFO L351 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 [2023-11-06 20:35:10,194 INFO L351 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 [2023-11-06 20:35:10,224 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-06 20:35:10,225 INFO L351 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 [2023-11-06 20:35:10,254 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2023-11-06 20:35:10,254 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-06 20:35:10,255 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [134355870] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-06 20:35:10,255 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-06 20:35:10,255 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [10] total 14 [2023-11-06 20:35:10,255 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1521564883] [2023-11-06 20:35:10,255 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-06 20:35:10,256 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-11-06 20:35:10,256 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-06 20:35:10,257 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-11-06 20:35:10,257 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=44, Invalid=169, Unknown=1, NotChecked=26, Total=240 [2023-11-06 20:35:10,257 INFO L87 Difference]: Start difference. First operand 86 states and 94 transitions. Second operand has 7 states, 5 states have (on average 2.6) internal successors, (13), 5 states have internal predecessors, (13), 2 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2023-11-06 20:35:10,412 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-06 20:35:10,412 INFO L93 Difference]: Finished difference Result 81 states and 89 transitions. [2023-11-06 20:35:10,412 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-11-06 20:35:10,412 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 5 states have (on average 2.6) internal successors, (13), 5 states have internal predecessors, (13), 2 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 27 [2023-11-06 20:35:10,413 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-06 20:35:10,413 INFO L225 Difference]: With dead ends: 81 [2023-11-06 20:35:10,413 INFO L226 Difference]: Without dead ends: 81 [2023-11-06 20:35:10,414 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 26 SyntacticMatches, 0 SemanticMatches, 15 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 38 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=49, Invalid=194, Unknown=1, NotChecked=28, Total=272 [2023-11-06 20:35:10,415 INFO L413 NwaCegarLoop]: 57 mSDtfsCounter, 25 mSDsluCounter, 123 mSDsCounter, 0 mSdLazyCounter, 138 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 25 SdHoareTripleChecker+Valid, 180 SdHoareTripleChecker+Invalid, 252 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 138 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 110 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-06 20:35:10,415 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [25 Valid, 180 Invalid, 252 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 138 Invalid, 0 Unknown, 110 Unchecked, 0.1s Time] [2023-11-06 20:35:10,415 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2023-11-06 20:35:10,418 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 81. [2023-11-06 20:35:10,418 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 81 states, 48 states have (on average 1.7291666666666667) internal successors, (83), 76 states have internal predecessors, (83), 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) [2023-11-06 20:35:10,419 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 89 transitions. [2023-11-06 20:35:10,419 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 89 transitions. Word has length 27 [2023-11-06 20:35:10,420 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-06 20:35:10,420 INFO L495 AbstractCegarLoop]: Abstraction has 81 states and 89 transitions. [2023-11-06 20:35:10,420 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 5 states have (on average 2.6) internal successors, (13), 5 states have internal predecessors, (13), 2 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2023-11-06 20:35:10,420 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 89 transitions. [2023-11-06 20:35:10,421 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2023-11-06 20:35:10,421 INFO L187 NwaCegarLoop]: Found error trace [2023-11-06 20:35:10,421 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-06 20:35:10,432 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7942cc55-cebf-4d62-8f52-45fbb444071f/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2023-11-06 20:35:10,621 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7942cc55-cebf-4d62-8f52-45fbb444071f/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable8 [2023-11-06 20:35:10,622 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr6REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 47 more)] === [2023-11-06 20:35:10,622 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 20:35:10,622 INFO L85 PathProgramCache]: Analyzing trace with hash 1441601264, now seen corresponding path program 1 times [2023-11-06 20:35:10,622 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-06 20:35:10,623 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [723117214] [2023-11-06 20:35:10,623 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 20:35:10,623 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 20:35:10,655 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 20:35:10,740 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2023-11-06 20:35:10,740 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-06 20:35:10,741 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [723117214] [2023-11-06 20:35:10,741 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [723117214] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-06 20:35:10,741 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-06 20:35:10,741 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2023-11-06 20:35:10,741 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1216569475] [2023-11-06 20:35:10,741 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-06 20:35:10,742 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-11-06 20:35:10,742 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-06 20:35:10,742 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-11-06 20:35:10,742 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-11-06 20:35:10,743 INFO L87 Difference]: Start difference. First operand 81 states and 89 transitions. Second operand has 6 states, 4 states have (on average 4.25) internal successors, (17), 5 states have internal predecessors, (17), 1 states have call successors, (3), 1 states have call predecessors, (3), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2023-11-06 20:35:10,899 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-06 20:35:10,899 INFO L93 Difference]: Finished difference Result 79 states and 87 transitions. [2023-11-06 20:35:10,900 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-11-06 20:35:10,900 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 4 states have (on average 4.25) internal successors, (17), 5 states have internal predecessors, (17), 1 states have call successors, (3), 1 states have call predecessors, (3), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) Word has length 29 [2023-11-06 20:35:10,900 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-06 20:35:10,901 INFO L225 Difference]: With dead ends: 79 [2023-11-06 20:35:10,901 INFO L226 Difference]: Without dead ends: 79 [2023-11-06 20:35:10,901 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 [2023-11-06 20:35:10,902 INFO L413 NwaCegarLoop]: 57 mSDtfsCounter, 22 mSDsluCounter, 155 mSDsCounter, 0 mSdLazyCounter, 189 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 22 SdHoareTripleChecker+Valid, 212 SdHoareTripleChecker+Invalid, 191 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 189 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-06 20:35:10,902 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [22 Valid, 212 Invalid, 191 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 189 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-06 20:35:10,903 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2023-11-06 20:35:10,905 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 79. [2023-11-06 20:35:10,905 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 79 states, 48 states have (on average 1.6875) internal successors, (81), 74 states have internal predecessors, (81), 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) [2023-11-06 20:35:10,906 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 87 transitions. [2023-11-06 20:35:10,906 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 87 transitions. Word has length 29 [2023-11-06 20:35:10,906 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-06 20:35:10,906 INFO L495 AbstractCegarLoop]: Abstraction has 79 states and 87 transitions. [2023-11-06 20:35:10,907 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 4 states have (on average 4.25) internal successors, (17), 5 states have internal predecessors, (17), 1 states have call successors, (3), 1 states have call predecessors, (3), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2023-11-06 20:35:10,907 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 87 transitions. [2023-11-06 20:35:10,907 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2023-11-06 20:35:10,908 INFO L187 NwaCegarLoop]: Found error trace [2023-11-06 20:35:10,908 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-06 20:35:10,908 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2023-11-06 20:35:10,908 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr7REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 47 more)] === [2023-11-06 20:35:10,908 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 20:35:10,908 INFO L85 PathProgramCache]: Analyzing trace with hash 1441601265, now seen corresponding path program 1 times [2023-11-06 20:35:10,909 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-06 20:35:10,909 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [248859386] [2023-11-06 20:35:10,909 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 20:35:10,909 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 20:35:10,934 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 20:35:11,133 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2023-11-06 20:35:11,133 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-06 20:35:11,133 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [248859386] [2023-11-06 20:35:11,133 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [248859386] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-06 20:35:11,133 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-06 20:35:11,134 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2023-11-06 20:35:11,134 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1737394536] [2023-11-06 20:35:11,134 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-06 20:35:11,135 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-11-06 20:35:11,136 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-06 20:35:11,136 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-11-06 20:35:11,136 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-11-06 20:35:11,137 INFO L87 Difference]: Start difference. First operand 79 states and 87 transitions. Second operand has 6 states, 4 states have (on average 4.75) internal successors, (19), 5 states have internal predecessors, (19), 1 states have call successors, (3), 1 states have call predecessors, (3), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2023-11-06 20:35:11,291 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-06 20:35:11,291 INFO L93 Difference]: Finished difference Result 77 states and 85 transitions. [2023-11-06 20:35:11,291 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-11-06 20:35:11,292 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 4 states have (on average 4.75) internal successors, (19), 5 states have internal predecessors, (19), 1 states have call successors, (3), 1 states have call predecessors, (3), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) Word has length 29 [2023-11-06 20:35:11,292 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-06 20:35:11,292 INFO L225 Difference]: With dead ends: 77 [2023-11-06 20:35:11,293 INFO L226 Difference]: Without dead ends: 77 [2023-11-06 20:35:11,293 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 [2023-11-06 20:35:11,293 INFO L413 NwaCegarLoop]: 57 mSDtfsCounter, 19 mSDsluCounter, 167 mSDsCounter, 0 mSdLazyCounter, 169 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 19 SdHoareTripleChecker+Valid, 224 SdHoareTripleChecker+Invalid, 170 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 169 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-06 20:35:11,294 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [19 Valid, 224 Invalid, 170 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 169 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-06 20:35:11,294 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2023-11-06 20:35:11,296 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 77. [2023-11-06 20:35:11,296 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 77 states, 48 states have (on average 1.6458333333333333) internal successors, (79), 72 states have internal predecessors, (79), 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) [2023-11-06 20:35:11,298 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 85 transitions. [2023-11-06 20:35:11,298 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 85 transitions. Word has length 29 [2023-11-06 20:35:11,299 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-06 20:35:11,299 INFO L495 AbstractCegarLoop]: Abstraction has 77 states and 85 transitions. [2023-11-06 20:35:11,299 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 4 states have (on average 4.75) internal successors, (19), 5 states have internal predecessors, (19), 1 states have call successors, (3), 1 states have call predecessors, (3), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2023-11-06 20:35:11,299 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 85 transitions. [2023-11-06 20:35:11,303 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2023-11-06 20:35:11,303 INFO L187 NwaCegarLoop]: Found error trace [2023-11-06 20:35:11,304 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-06 20:35:11,304 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2023-11-06 20:35:11,304 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr12REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 47 more)] === [2023-11-06 20:35:11,304 INFO L145 PredicateUnifier]: Initialized classic predicate unifier [2023-11-06 20:35:11,305 INFO L85 PathProgramCache]: Analyzing trace with hash 1739979174, now seen corresponding path program 1 times [2023-11-06 20:35:11,305 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-06 20:35:11,305 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [104087537] [2023-11-06 20:35:11,305 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 20:35:11,305 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-06 20:35:11,352 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 20:35:11,945 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 12 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-06 20:35:11,945 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-06 20:35:11,945 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [104087537] [2023-11-06 20:35:11,946 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [104087537] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-06 20:35:11,946 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [2107036421] [2023-11-06 20:35:11,946 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-06 20:35:11,946 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-06 20:35:11,946 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7942cc55-cebf-4d62-8f52-45fbb444071f/bin/utaipan-verify-FOvIYxoinp/z3 [2023-11-06 20:35:11,947 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7942cc55-cebf-4d62-8f52-45fbb444071f/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-06 20:35:11,948 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_7942cc55-cebf-4d62-8f52-45fbb444071f/bin/utaipan-verify-FOvIYxoinp/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-11-06 20:35:12,113 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-06 20:35:12,116 INFO L262 TraceCheckSpWp]: Trace formula consists of 337 conjuncts, 41 conjunts are in the unsatisfiable core [2023-11-06 20:35:12,120 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-06 20:35:12,164 INFO L351 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 [2023-11-06 20:35:12,337 INFO L351 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 [2023-11-06 20:35:12,456 WARN L861 $PredicateComparison]: unable to prove that (exists ((|node_create_~temp~0#1.base| Int)) (and (<= (+ |node_create_~temp~0#1.base| 1) |c_#StackHeapBarrier|) (= |c_#valid| (store |c_old(#valid)| |node_create_~temp~0#1.base| (select |c_#valid| |node_create_~temp~0#1.base|))) (= |c_#memory_$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 [2023-11-06 20:35:12,467 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-06 20:35:12,469 INFO L351 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 [2023-11-06 20:35:12,488 INFO L322 Elim1Store]: treesize reduction 32, result has 36.0 percent of original size [2023-11-06 20:35:12,489 INFO L351 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 23 treesize of output 24 [2023-11-06 20:35:12,529 INFO L351 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 [2023-11-06 20:35:12,531 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 11 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 1 not checked. [2023-11-06 20:35:12,531 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-06 20:35:12,654 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [2107036421] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-06 20:35:12,654 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [390732639] [2023-11-06 20:35:12,657 INFO L159 IcfgInterpreter]: Started Sifa with 20 locations of interest [2023-11-06 20:35:12,657 INFO L166 IcfgInterpreter]: Building call graph [2023-11-06 20:35:12,658 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-06 20:35:12,658 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-06 20:35:12,658 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs