./Ultimate.py --spec ../../sv-benchmarks/c/properties/valid-memsafety.prp --file ../../sv-benchmarks/c/list-ext3-properties/sll_of_sll_nondet_append-1.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for memory safety (deref-memtrack) Using default analysis Version 527bcce2 Calling Ultimate with: /usr/lib/jvm/java-11-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4ce69841-e1ef-4fae-8aa6-b6721e567e2e/bin/utaipan-verify-QoSU8krkJ5/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4ce69841-e1ef-4fae-8aa6-b6721e567e2e/bin/utaipan-verify-QoSU8krkJ5/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4ce69841-e1ef-4fae-8aa6-b6721e567e2e/bin/utaipan-verify-QoSU8krkJ5/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4ce69841-e1ef-4fae-8aa6-b6721e567e2e/bin/utaipan-verify-QoSU8krkJ5/config/TaipanMemDerefMemtrack.xml -i ../../sv-benchmarks/c/list-ext3-properties/sll_of_sll_nondet_append-1.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4ce69841-e1ef-4fae-8aa6-b6721e567e2e/bin/utaipan-verify-QoSU8krkJ5/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4ce69841-e1ef-4fae-8aa6-b6721e567e2e/bin/utaipan-verify-QoSU8krkJ5 --witnessprinter.witness.filename witness --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash fabf091179f48b7141dc193b5040f4974c042bd8a2afb03b99137d693bf63ce7 --- Real Ultimate output --- This is Ultimate 0.2.3-dev-527bcce [2023-11-21 19:00:54,604 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-11-21 19:00:54,730 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4ce69841-e1ef-4fae-8aa6-b6721e567e2e/bin/utaipan-verify-QoSU8krkJ5/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Default.epf [2023-11-21 19:00:54,742 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-11-21 19:00:54,743 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-11-21 19:00:54,786 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-11-21 19:00:54,786 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-11-21 19:00:54,787 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-11-21 19:00:54,788 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-11-21 19:00:54,793 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-11-21 19:00:54,794 INFO L153 SettingsManager]: * User list type=DISABLED [2023-11-21 19:00:54,795 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-11-21 19:00:54,796 INFO L153 SettingsManager]: * Explicit value domain=true [2023-11-21 19:00:54,797 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-11-21 19:00:54,798 INFO L153 SettingsManager]: * Octagon Domain=false [2023-11-21 19:00:54,798 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-11-21 19:00:54,799 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-11-21 19:00:54,799 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-11-21 19:00:54,800 INFO L153 SettingsManager]: * Interval Domain=false [2023-11-21 19:00:54,800 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-11-21 19:00:54,801 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-11-21 19:00:54,801 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2023-11-21 19:00:54,802 INFO L151 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2023-11-21 19:00:54,802 INFO L153 SettingsManager]: * Create parallel compositions if possible=false [2023-11-21 19:00:54,803 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-11-21 19:00:54,804 INFO L153 SettingsManager]: * sizeof long=4 [2023-11-21 19:00:54,804 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-11-21 19:00:54,804 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-11-21 19:00:54,805 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-11-21 19:00:54,805 INFO L153 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2023-11-21 19:00:54,806 INFO L153 SettingsManager]: * Bitprecise bitfields=true [2023-11-21 19:00:54,807 INFO L153 SettingsManager]: * SV-COMP memtrack compatibility mode=true [2023-11-21 19:00:54,807 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-11-21 19:00:54,807 INFO L153 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2023-11-21 19:00:54,807 INFO L153 SettingsManager]: * Check unreachability of reach_error function=false [2023-11-21 19:00:54,808 INFO L153 SettingsManager]: * sizeof long double=12 [2023-11-21 19:00:54,808 INFO L153 SettingsManager]: * Use constant arrays=true [2023-11-21 19:00:54,808 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-11-21 19:00:54,808 INFO L153 SettingsManager]: * Only consider context switches at boundaries of atomic blocks=true [2023-11-21 19:00:54,809 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-11-21 19:00:54,809 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-21 19:00:54,809 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-11-21 19:00:54,810 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-11-21 19:00:54,810 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-11-21 19:00:54,810 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-11-21 19:00:54,811 INFO L153 SettingsManager]: * Apply one-shot large block encoding in concurrent analysis=false [2023-11-21 19:00:54,811 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-11-21 19:00:54,811 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-11-21 19:00:54,811 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_4ce69841-e1ef-4fae-8aa6-b6721e567e2e/bin/utaipan-verify-QoSU8krkJ5/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4ce69841-e1ef-4fae-8aa6-b6721e567e2e/bin/utaipan-verify-QoSU8krkJ5 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> fabf091179f48b7141dc193b5040f4974c042bd8a2afb03b99137d693bf63ce7 [2023-11-21 19:00:55,144 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-11-21 19:00:55,177 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-11-21 19:00:55,181 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-11-21 19:00:55,182 INFO L270 PluginConnector]: Initializing CDTParser... [2023-11-21 19:00:55,183 INFO L274 PluginConnector]: CDTParser initialized [2023-11-21 19:00:55,184 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4ce69841-e1ef-4fae-8aa6-b6721e567e2e/bin/utaipan-verify-QoSU8krkJ5/../../sv-benchmarks/c/list-ext3-properties/sll_of_sll_nondet_append-1.i [2023-11-21 19:00:58,310 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-11-21 19:00:58,645 INFO L384 CDTParser]: Found 1 translation units. [2023-11-21 19:00:58,646 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4ce69841-e1ef-4fae-8aa6-b6721e567e2e/sv-benchmarks/c/list-ext3-properties/sll_of_sll_nondet_append-1.i [2023-11-21 19:00:58,671 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4ce69841-e1ef-4fae-8aa6-b6721e567e2e/bin/utaipan-verify-QoSU8krkJ5/data/3ce2a7e97/b99e699d91b3479dad620aa0b088ec3d/FLAGd62f752b9 [2023-11-21 19:00:58,688 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4ce69841-e1ef-4fae-8aa6-b6721e567e2e/bin/utaipan-verify-QoSU8krkJ5/data/3ce2a7e97/b99e699d91b3479dad620aa0b088ec3d [2023-11-21 19:00:58,694 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-11-21 19:00:58,697 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-11-21 19:00:58,701 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-11-21 19:00:58,701 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-11-21 19:00:58,708 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-11-21 19:00:58,709 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.11 07:00:58" (1/1) ... [2023-11-21 19:00:58,710 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@5893b2a9 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 07:00:58, skipping insertion in model container [2023-11-21 19:00:58,711 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 21.11 07:00:58" (1/1) ... [2023-11-21 19:00:58,780 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-11-21 19:00:59,260 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-21 19:00:59,275 INFO L202 MainTranslator]: Completed pre-run [2023-11-21 19:00:59,328 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-21 19:00:59,363 INFO L206 MainTranslator]: Completed translation [2023-11-21 19:00:59,364 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 07:00:59 WrapperNode [2023-11-21 19:00:59,364 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-11-21 19:00:59,366 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-11-21 19:00:59,366 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-11-21 19:00:59,366 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-11-21 19:00:59,374 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 07:00:59" (1/1) ... [2023-11-21 19:00:59,399 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 07:00:59" (1/1) ... [2023-11-21 19:00:59,436 INFO L138 Inliner]: procedures = 129, calls = 40, calls flagged for inlining = 8, calls inlined = 8, statements flattened = 192 [2023-11-21 19:00:59,437 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-11-21 19:00:59,437 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-11-21 19:00:59,438 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-11-21 19:00:59,438 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-11-21 19:00:59,448 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 07:00:59" (1/1) ... [2023-11-21 19:00:59,448 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 07:00:59" (1/1) ... [2023-11-21 19:00:59,452 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 07:00:59" (1/1) ... [2023-11-21 19:00:59,453 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 07:00:59" (1/1) ... [2023-11-21 19:00:59,464 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 07:00:59" (1/1) ... [2023-11-21 19:00:59,469 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 07:00:59" (1/1) ... [2023-11-21 19:00:59,471 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 07:00:59" (1/1) ... [2023-11-21 19:00:59,473 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 07:00:59" (1/1) ... [2023-11-21 19:00:59,478 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-11-21 19:00:59,479 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-11-21 19:00:59,479 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-11-21 19:00:59,479 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-11-21 19:00:59,480 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 07:00:59" (1/1) ... [2023-11-21 19:00:59,487 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-21 19:00:59,500 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4ce69841-e1ef-4fae-8aa6-b6721e567e2e/bin/utaipan-verify-QoSU8krkJ5/z3 [2023-11-21 19:00:59,520 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4ce69841-e1ef-4fae-8aa6-b6721e567e2e/bin/utaipan-verify-QoSU8krkJ5/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-11-21 19:00:59,522 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4ce69841-e1ef-4fae-8aa6-b6721e567e2e/bin/utaipan-verify-QoSU8krkJ5/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-11-21 19:00:59,556 INFO L130 BoogieDeclarations]: Found specification of procedure myexit [2023-11-21 19:00:59,556 INFO L138 BoogieDeclarations]: Found implementation of procedure myexit [2023-11-21 19:00:59,556 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2023-11-21 19:00:59,556 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-11-21 19:00:59,556 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2023-11-21 19:00:59,557 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2023-11-21 19:00:59,557 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2023-11-21 19:00:59,557 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-11-21 19:00:59,557 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~$Pointer$ [2023-11-21 19:00:59,557 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-11-21 19:00:59,558 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-11-21 19:00:59,558 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-11-21 19:00:59,685 INFO L240 CfgBuilder]: Building ICFG [2023-11-21 19:00:59,688 INFO L266 CfgBuilder]: Building CFG for each procedure with an implementation [2023-11-21 19:00:59,712 INFO L774 $ProcedureCfgBuilder]: dead code at ProgramPoint myexitFINAL: assume true; [2023-11-21 19:01:00,154 INFO L281 CfgBuilder]: Performing block encoding [2023-11-21 19:01:00,281 INFO L303 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-11-21 19:01:00,281 INFO L308 CfgBuilder]: Removed 9 assume(true) statements. [2023-11-21 19:01:00,284 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.11 07:01:00 BoogieIcfgContainer [2023-11-21 19:01:00,284 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-11-21 19:01:00,288 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-11-21 19:01:00,289 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-11-21 19:01:00,292 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-11-21 19:01:00,293 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 21.11 07:00:58" (1/3) ... [2023-11-21 19:01:00,294 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@e928b23 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.11 07:01:00, skipping insertion in model container [2023-11-21 19:01:00,294 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 21.11 07:00:59" (2/3) ... [2023-11-21 19:01:00,296 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@e928b23 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 21.11 07:01:00, skipping insertion in model container [2023-11-21 19:01:00,297 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 21.11 07:01:00" (3/3) ... [2023-11-21 19:01:00,299 INFO L112 eAbstractionObserver]: Analyzing ICFG sll_of_sll_nondet_append-1.i [2023-11-21 19:01:00,318 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-11-21 19:01:00,318 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 42 error locations. [2023-11-21 19:01:00,368 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-11-21 19:01:00,376 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;@7676e0d1, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-11-21 19:01:00,377 INFO L358 AbstractCegarLoop]: Starting to check reachability of 42 error locations. [2023-11-21 19:01:00,382 INFO L276 IsEmpty]: Start isEmpty. Operand has 97 states, 52 states have (on average 2.173076923076923) internal successors, (113), 95 states have internal predecessors, (113), 2 states have call successors, (2), 1 states have call predecessors, (2), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 19:01:00,389 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 4 [2023-11-21 19:01:00,389 INFO L187 NwaCegarLoop]: Found error trace [2023-11-21 19:01:00,390 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1] [2023-11-21 19:01:00,391 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr18REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 39 more)] === [2023-11-21 19:01:00,399 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 19:01:00,399 INFO L85 PathProgramCache]: Analyzing trace with hash 316076, now seen corresponding path program 1 times [2023-11-21 19:01:00,412 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-21 19:01:00,413 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [715671420] [2023-11-21 19:01:00,413 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:01:00,414 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 19:01:00,517 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 19:01:00,688 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-21 19:01:00,688 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-21 19:01:00,689 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [715671420] [2023-11-21 19:01:00,689 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [715671420] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-21 19:01:00,690 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-21 19:01:00,690 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-11-21 19:01:00,691 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [747851282] [2023-11-21 19:01:00,692 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-21 19:01:00,696 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-21 19:01:00,697 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-21 19:01:00,727 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-21 19:01:00,728 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-21 19:01:00,730 INFO L87 Difference]: Start difference. First operand has 97 states, 52 states have (on average 2.173076923076923) internal successors, (113), 95 states have internal predecessors, (113), 2 states have call successors, (2), 1 states have call predecessors, (2), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 3 states, 3 states have (on average 1.0) internal successors, (3), 2 states have internal predecessors, (3), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 19:01:00,859 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-21 19:01:00,860 INFO L93 Difference]: Finished difference Result 136 states and 156 transitions. [2023-11-21 19:01:00,861 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-21 19:01:00,862 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 1.0) internal successors, (3), 2 states have internal predecessors, (3), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 3 [2023-11-21 19:01:00,863 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-21 19:01:00,871 INFO L225 Difference]: With dead ends: 136 [2023-11-21 19:01:00,871 INFO L226 Difference]: Without dead ends: 129 [2023-11-21 19:01:00,873 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 [2023-11-21 19:01:00,877 INFO L413 NwaCegarLoop]: 83 mSDtfsCounter, 43 mSDsluCounter, 74 mSDsCounter, 0 mSdLazyCounter, 62 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 43 SdHoareTripleChecker+Valid, 157 SdHoareTripleChecker+Invalid, 62 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 62 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-21 19:01:00,878 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [43 Valid, 157 Invalid, 62 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 62 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-21 19:01:00,896 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 129 states. [2023-11-21 19:01:00,914 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 129 to 92. [2023-11-21 19:01:00,916 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 92 states, 50 states have (on average 2.08) internal successors, (104), 91 states have internal predecessors, (104), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 19:01:00,918 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 92 states to 92 states and 104 transitions. [2023-11-21 19:01:00,919 INFO L78 Accepts]: Start accepts. Automaton has 92 states and 104 transitions. Word has length 3 [2023-11-21 19:01:00,920 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-21 19:01:00,920 INFO L495 AbstractCegarLoop]: Abstraction has 92 states and 104 transitions. [2023-11-21 19:01:00,920 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 1.0) internal successors, (3), 2 states have internal predecessors, (3), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 19:01:00,920 INFO L276 IsEmpty]: Start isEmpty. Operand 92 states and 104 transitions. [2023-11-21 19:01:00,921 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2023-11-21 19:01:00,921 INFO L187 NwaCegarLoop]: Found error trace [2023-11-21 19:01:00,921 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2023-11-21 19:01:00,921 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-11-21 19:01:00,922 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr18REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 39 more)] === [2023-11-21 19:01:00,922 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 19:01:00,922 INFO L85 PathProgramCache]: Analyzing trace with hash 353284292, now seen corresponding path program 1 times [2023-11-21 19:01:00,922 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-21 19:01:00,923 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [989292899] [2023-11-21 19:01:00,923 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:01:00,923 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 19:01:00,940 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 19:01:01,007 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-21 19:01:01,007 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-21 19:01:01,007 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [989292899] [2023-11-21 19:01:01,008 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [989292899] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-21 19:01:01,008 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-21 19:01:01,008 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-11-21 19:01:01,008 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [473816668] [2023-11-21 19:01:01,008 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-21 19:01:01,010 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-21 19:01:01,010 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-21 19:01:01,010 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-21 19:01:01,011 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-21 19:01:01,011 INFO L87 Difference]: Start difference. First operand 92 states and 104 transitions. Second operand has 3 states, 2 states have (on average 3.5) internal successors, (7), 2 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 19:01:01,184 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-21 19:01:01,184 INFO L93 Difference]: Finished difference Result 113 states and 127 transitions. [2023-11-21 19:01:01,184 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-21 19:01:01,185 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 3.5) internal successors, (7), 2 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 7 [2023-11-21 19:01:01,185 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-21 19:01:01,186 INFO L225 Difference]: With dead ends: 113 [2023-11-21 19:01:01,188 INFO L226 Difference]: Without dead ends: 113 [2023-11-21 19:01:01,188 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-21 19:01:01,191 INFO L413 NwaCegarLoop]: 51 mSDtfsCounter, 89 mSDsluCounter, 13 mSDsCounter, 0 mSdLazyCounter, 63 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 89 SdHoareTripleChecker+Valid, 64 SdHoareTripleChecker+Invalid, 66 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 63 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-21 19:01:01,193 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [89 Valid, 64 Invalid, 66 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 63 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-21 19:01:01,195 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 113 states. [2023-11-21 19:01:01,203 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 113 to 90. [2023-11-21 19:01:01,206 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 90 states, 50 states have (on average 2.04) internal successors, (102), 89 states have internal predecessors, (102), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 19:01:01,208 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 90 states to 90 states and 102 transitions. [2023-11-21 19:01:01,211 INFO L78 Accepts]: Start accepts. Automaton has 90 states and 102 transitions. Word has length 7 [2023-11-21 19:01:01,211 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-21 19:01:01,212 INFO L495 AbstractCegarLoop]: Abstraction has 90 states and 102 transitions. [2023-11-21 19:01:01,212 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 3.5) internal successors, (7), 2 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 19:01:01,212 INFO L276 IsEmpty]: Start isEmpty. Operand 90 states and 102 transitions. [2023-11-21 19:01:01,213 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2023-11-21 19:01:01,213 INFO L187 NwaCegarLoop]: Found error trace [2023-11-21 19:01:01,214 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2023-11-21 19:01:01,214 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2023-11-21 19:01:01,214 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr19REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 39 more)] === [2023-11-21 19:01:01,215 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 19:01:01,215 INFO L85 PathProgramCache]: Analyzing trace with hash 353284293, now seen corresponding path program 1 times [2023-11-21 19:01:01,216 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-21 19:01:01,217 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1560106088] [2023-11-21 19:01:01,218 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:01:01,219 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 19:01:01,242 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 19:01:01,322 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-21 19:01:01,322 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-21 19:01:01,323 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1560106088] [2023-11-21 19:01:01,323 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1560106088] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-21 19:01:01,323 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [178627273] [2023-11-21 19:01:01,324 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:01:01,324 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 19:01:01,324 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4ce69841-e1ef-4fae-8aa6-b6721e567e2e/bin/utaipan-verify-QoSU8krkJ5/z3 [2023-11-21 19:01:01,326 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4ce69841-e1ef-4fae-8aa6-b6721e567e2e/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-21 19:01:01,344 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4ce69841-e1ef-4fae-8aa6-b6721e567e2e/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-11-21 19:01:01,436 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 19:01:01,439 INFO L262 TraceCheckSpWp]: Trace formula consists of 50 conjuncts, 5 conjunts are in the unsatisfiable core [2023-11-21 19:01:01,447 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-21 19:01:01,553 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-21 19:01:01,554 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-21 19:01:01,577 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-21 19:01:01,578 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [178627273] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-21 19:01:01,578 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2094591312] [2023-11-21 19:01:01,604 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2023-11-21 19:01:01,605 INFO L166 IcfgInterpreter]: Building call graph [2023-11-21 19:01:01,610 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-21 19:01:01,622 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-21 19:01:01,623 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-21 19:01:02,400 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-21 19:01:02,534 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '580#(and (<= 1 |#StackHeapBarrier|) (<= (select |#length| |ULTIMATE.start_main_~#head~1#1.base|) 3) (= 5 |ULTIMATE.start_main_~max~0#1|) (= |ULTIMATE.start_main_~#head~1#1.offset| 0) (= 3 |ULTIMATE.start_main_~min~0#1|) (<= 2 |ULTIMATE.start_main_~#head~1#1.base|) (<= 6 |ULTIMATE.start_main_~i~0#1|))' at error location [2023-11-21 19:01:02,534 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-21 19:01:02,534 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-21 19:01:02,535 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3, 3] total 6 [2023-11-21 19:01:02,535 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [878823018] [2023-11-21 19:01:02,535 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-21 19:01:02,536 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-11-21 19:01:02,536 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-21 19:01:02,537 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-11-21 19:01:02,539 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=39, Invalid=93, Unknown=0, NotChecked=0, Total=132 [2023-11-21 19:01:02,539 INFO L87 Difference]: Start difference. First operand 90 states and 102 transitions. Second operand has 7 states, 7 states have (on average 2.7142857142857144) internal successors, (19), 6 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 19:01:02,716 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-21 19:01:02,717 INFO L93 Difference]: Finished difference Result 201 states and 222 transitions. [2023-11-21 19:01:02,717 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-11-21 19:01:02,717 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 2.7142857142857144) internal successors, (19), 6 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 7 [2023-11-21 19:01:02,717 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-21 19:01:02,722 INFO L225 Difference]: With dead ends: 201 [2023-11-21 19:01:02,723 INFO L226 Difference]: Without dead ends: 201 [2023-11-21 19:01:02,723 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 11 SyntacticMatches, 1 SemanticMatches, 10 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 41 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=39, Invalid=93, Unknown=0, NotChecked=0, Total=132 [2023-11-21 19:01:02,727 INFO L413 NwaCegarLoop]: 94 mSDtfsCounter, 284 mSDsluCounter, 150 mSDsCounter, 0 mSdLazyCounter, 110 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 284 SdHoareTripleChecker+Valid, 244 SdHoareTripleChecker+Invalid, 115 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 110 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-21 19:01:02,728 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [284 Valid, 244 Invalid, 115 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 110 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-21 19:01:02,731 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 201 states. [2023-11-21 19:01:02,746 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 201 to 133. [2023-11-21 19:01:02,747 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 133 states, 93 states have (on average 2.043010752688172) internal successors, (190), 132 states have internal predecessors, (190), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 19:01:02,749 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 133 states to 133 states and 190 transitions. [2023-11-21 19:01:02,749 INFO L78 Accepts]: Start accepts. Automaton has 133 states and 190 transitions. Word has length 7 [2023-11-21 19:01:02,749 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-21 19:01:02,749 INFO L495 AbstractCegarLoop]: Abstraction has 133 states and 190 transitions. [2023-11-21 19:01:02,750 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 2.7142857142857144) internal successors, (19), 6 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 19:01:02,750 INFO L276 IsEmpty]: Start isEmpty. Operand 133 states and 190 transitions. [2023-11-21 19:01:02,750 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2023-11-21 19:01:02,750 INFO L187 NwaCegarLoop]: Found error trace [2023-11-21 19:01:02,750 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2023-11-21 19:01:02,772 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4ce69841-e1ef-4fae-8aa6-b6721e567e2e/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-11-21 19:01:02,971 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4ce69841-e1ef-4fae-8aa6-b6721e567e2e/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 19:01:02,972 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 39 more)] === [2023-11-21 19:01:02,972 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 19:01:02,972 INFO L85 PathProgramCache]: Analyzing trace with hash -1933963528, now seen corresponding path program 1 times [2023-11-21 19:01:02,972 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-21 19:01:02,972 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1889558408] [2023-11-21 19:01:02,972 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:01:02,973 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 19:01:03,006 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 19:01:03,198 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-21 19:01:03,198 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-21 19:01:03,198 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1889558408] [2023-11-21 19:01:03,198 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1889558408] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-21 19:01:03,199 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-21 19:01:03,199 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-11-21 19:01:03,199 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2084225742] [2023-11-21 19:01:03,199 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-21 19:01:03,200 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-11-21 19:01:03,200 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-21 19:01:03,201 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-11-21 19:01:03,201 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-11-21 19:01:03,201 INFO L87 Difference]: Start difference. First operand 133 states and 190 transitions. Second operand has 5 states, 5 states have (on average 1.6) internal successors, (8), 4 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 19:01:03,341 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-21 19:01:03,341 INFO L93 Difference]: Finished difference Result 156 states and 195 transitions. [2023-11-21 19:01:03,342 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-11-21 19:01:03,342 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 1.6) internal successors, (8), 4 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 8 [2023-11-21 19:01:03,342 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-21 19:01:03,343 INFO L225 Difference]: With dead ends: 156 [2023-11-21 19:01:03,343 INFO L226 Difference]: Without dead ends: 156 [2023-11-21 19:01:03,344 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=25, Unknown=0, NotChecked=0, Total=42 [2023-11-21 19:01:03,345 INFO L413 NwaCegarLoop]: 73 mSDtfsCounter, 65 mSDsluCounter, 213 mSDsCounter, 0 mSdLazyCounter, 117 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 65 SdHoareTripleChecker+Valid, 286 SdHoareTripleChecker+Invalid, 117 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 117 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-21 19:01:03,345 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [65 Valid, 286 Invalid, 117 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 117 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-21 19:01:03,346 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 156 states. [2023-11-21 19:01:03,352 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 156 to 134. [2023-11-21 19:01:03,353 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 134 states, 94 states have (on average 2.0319148936170213) internal successors, (191), 133 states have internal predecessors, (191), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 19:01:03,355 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 134 states to 134 states and 191 transitions. [2023-11-21 19:01:03,355 INFO L78 Accepts]: Start accepts. Automaton has 134 states and 191 transitions. Word has length 8 [2023-11-21 19:01:03,355 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-21 19:01:03,355 INFO L495 AbstractCegarLoop]: Abstraction has 134 states and 191 transitions. [2023-11-21 19:01:03,356 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 1.6) internal successors, (8), 4 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 19:01:03,356 INFO L276 IsEmpty]: Start isEmpty. Operand 134 states and 191 transitions. [2023-11-21 19:01:03,356 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2023-11-21 19:01:03,357 INFO L187 NwaCegarLoop]: Found error trace [2023-11-21 19:01:03,357 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-21 19:01:03,357 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2023-11-21 19:01:03,357 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 39 more)] === [2023-11-21 19:01:03,358 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 19:01:03,358 INFO L85 PathProgramCache]: Analyzing trace with hash 176427374, now seen corresponding path program 1 times [2023-11-21 19:01:03,358 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-21 19:01:03,358 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [250038545] [2023-11-21 19:01:03,358 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:01:03,359 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 19:01:03,370 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 19:01:03,412 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-21 19:01:03,412 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-21 19:01:03,413 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [250038545] [2023-11-21 19:01:03,413 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [250038545] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-21 19:01:03,413 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-21 19:01:03,413 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-11-21 19:01:03,413 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1183856283] [2023-11-21 19:01:03,414 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-21 19:01:03,414 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-21 19:01:03,414 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-21 19:01:03,415 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-21 19:01:03,415 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-21 19:01:03,415 INFO L87 Difference]: Start difference. First operand 134 states and 191 transitions. Second operand has 3 states, 2 states have (on average 4.5) internal successors, (9), 3 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 19:01:03,497 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-21 19:01:03,497 INFO L93 Difference]: Finished difference Result 133 states and 188 transitions. [2023-11-21 19:01:03,497 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-21 19:01:03,498 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 4.5) internal successors, (9), 3 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 9 [2023-11-21 19:01:03,498 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-21 19:01:03,499 INFO L225 Difference]: With dead ends: 133 [2023-11-21 19:01:03,499 INFO L226 Difference]: Without dead ends: 133 [2023-11-21 19:01:03,499 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 [2023-11-21 19:01:03,500 INFO L413 NwaCegarLoop]: 75 mSDtfsCounter, 1 mSDsluCounter, 49 mSDsCounter, 0 mSdLazyCounter, 73 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 124 SdHoareTripleChecker+Invalid, 73 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 73 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-21 19:01:03,501 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1 Valid, 124 Invalid, 73 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 73 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-21 19:01:03,502 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 133 states. [2023-11-21 19:01:03,515 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 133 to 133. [2023-11-21 19:01:03,516 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 133 states, 94 states have (on average 2.0) internal successors, (188), 132 states have internal predecessors, (188), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 19:01:03,517 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 133 states to 133 states and 188 transitions. [2023-11-21 19:01:03,517 INFO L78 Accepts]: Start accepts. Automaton has 133 states and 188 transitions. Word has length 9 [2023-11-21 19:01:03,518 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-21 19:01:03,518 INFO L495 AbstractCegarLoop]: Abstraction has 133 states and 188 transitions. [2023-11-21 19:01:03,518 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 4.5) internal successors, (9), 3 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 19:01:03,518 INFO L276 IsEmpty]: Start isEmpty. Operand 133 states and 188 transitions. [2023-11-21 19:01:03,519 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 10 [2023-11-21 19:01:03,525 INFO L187 NwaCegarLoop]: Found error trace [2023-11-21 19:01:03,526 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-21 19:01:03,526 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2023-11-21 19:01:03,526 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 39 more)] === [2023-11-21 19:01:03,527 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 19:01:03,527 INFO L85 PathProgramCache]: Analyzing trace with hash 176427375, now seen corresponding path program 1 times [2023-11-21 19:01:03,527 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-21 19:01:03,527 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2062583161] [2023-11-21 19:01:03,527 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:01:03,527 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 19:01:03,541 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 19:01:03,604 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-21 19:01:03,605 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-21 19:01:03,605 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2062583161] [2023-11-21 19:01:03,605 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2062583161] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-21 19:01:03,605 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-21 19:01:03,606 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-11-21 19:01:03,606 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [418021096] [2023-11-21 19:01:03,606 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-21 19:01:03,606 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-21 19:01:03,606 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-21 19:01:03,607 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-21 19:01:03,607 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-21 19:01:03,608 INFO L87 Difference]: Start difference. First operand 133 states and 188 transitions. Second operand has 3 states, 2 states have (on average 4.5) internal successors, (9), 3 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 19:01:03,688 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-21 19:01:03,688 INFO L93 Difference]: Finished difference Result 132 states and 185 transitions. [2023-11-21 19:01:03,689 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-21 19:01:03,689 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 4.5) internal successors, (9), 3 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 9 [2023-11-21 19:01:03,689 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-21 19:01:03,690 INFO L225 Difference]: With dead ends: 132 [2023-11-21 19:01:03,691 INFO L226 Difference]: Without dead ends: 132 [2023-11-21 19:01:03,691 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 [2023-11-21 19:01:03,692 INFO L413 NwaCegarLoop]: 75 mSDtfsCounter, 0 mSDsluCounter, 52 mSDsCounter, 0 mSdLazyCounter, 69 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 127 SdHoareTripleChecker+Invalid, 69 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 69 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-21 19:01:03,692 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 127 Invalid, 69 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 69 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-21 19:01:03,693 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 132 states. [2023-11-21 19:01:03,695 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 132 to 132. [2023-11-21 19:01:03,696 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 132 states, 94 states have (on average 1.9680851063829787) internal successors, (185), 131 states have internal predecessors, (185), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 19:01:03,697 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 132 states to 132 states and 185 transitions. [2023-11-21 19:01:03,697 INFO L78 Accepts]: Start accepts. Automaton has 132 states and 185 transitions. Word has length 9 [2023-11-21 19:01:03,697 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-21 19:01:03,697 INFO L495 AbstractCegarLoop]: Abstraction has 132 states and 185 transitions. [2023-11-21 19:01:03,698 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 4.5) internal successors, (9), 3 states have internal predecessors, (9), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 19:01:03,698 INFO L276 IsEmpty]: Start isEmpty. Operand 132 states and 185 transitions. [2023-11-21 19:01:03,698 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2023-11-21 19:01:03,698 INFO L187 NwaCegarLoop]: Found error trace [2023-11-21 19:01:03,699 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-21 19:01:03,699 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2023-11-21 19:01:03,699 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 39 more)] === [2023-11-21 19:01:03,700 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 19:01:03,700 INFO L85 PathProgramCache]: Analyzing trace with hash 2043200796, now seen corresponding path program 1 times [2023-11-21 19:01:03,700 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-21 19:01:03,700 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [188963152] [2023-11-21 19:01:03,700 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:01:03,701 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 19:01:03,716 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 19:01:03,826 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-21 19:01:03,826 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-21 19:01:03,826 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [188963152] [2023-11-21 19:01:03,826 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [188963152] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-21 19:01:03,827 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [682537824] [2023-11-21 19:01:03,827 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:01:03,829 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 19:01:03,829 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4ce69841-e1ef-4fae-8aa6-b6721e567e2e/bin/utaipan-verify-QoSU8krkJ5/z3 [2023-11-21 19:01:03,830 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4ce69841-e1ef-4fae-8aa6-b6721e567e2e/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-21 19:01:03,859 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4ce69841-e1ef-4fae-8aa6-b6721e567e2e/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-11-21 19:01:03,937 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 19:01:03,938 INFO L262 TraceCheckSpWp]: Trace formula consists of 129 conjuncts, 10 conjunts are in the unsatisfiable core [2023-11-21 19:01:03,940 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-21 19:01:03,973 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-21 19:01:03,973 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-21 19:01:04,024 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-21 19:01:04,024 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [682537824] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-21 19:01:04,024 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [2016643676] [2023-11-21 19:01:04,027 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2023-11-21 19:01:04,027 INFO L166 IcfgInterpreter]: Building call graph [2023-11-21 19:01:04,028 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-21 19:01:04,028 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-21 19:01:04,028 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-21 19:01:05,498 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-21 19:01:06,693 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1824#(and (= 3 |ULTIMATE.start_node_create_with_sublist_#in~sublist_length#1|) (<= 1 |#StackHeapBarrier|) (= 3 |ULTIMATE.start_sll_append_#in~sublist_length#1|) (not (= (select |#valid| |ULTIMATE.start_node_create_with_sublist_~new_node~0#1.base|) 1)) (= |ULTIMATE.start_sll_append_~sublist_length#1| 3) (= 3 |ULTIMATE.start_main_~i~0#1|) (= 5 |ULTIMATE.start_main_~max~0#1|) (<= 2 |ULTIMATE.start_sll_append_#in~head#1.base|) (= |ULTIMATE.start_node_create_with_sublist_#t~ret6#1.base| |ULTIMATE.start_sll_create_#res#1.base|) (= |ULTIMATE.start_main_~#head~1#1.offset| 0) (= |ULTIMATE.start_sll_append_~head#1.offset| 0) (= |ULTIMATE.start_sll_create_#res#1.offset| 0) (= |ULTIMATE.start_node_create_with_sublist_~sublist_length#1| 3) (= |ULTIMATE.start_node_create_with_sublist_~new_node~0#1.offset| 0) (= 3 |ULTIMATE.start_main_~min~0#1|) (<= 2 |ULTIMATE.start_sll_append_~head#1.base|) (<= 2 |ULTIMATE.start_main_~#head~1#1.base|) (= |ULTIMATE.start_main_~j~0#1| 0) (= |ULTIMATE.start_sll_append_#in~head#1.offset| 0) (= 0 |ULTIMATE.start_node_create_with_sublist_#t~ret6#1.offset|))' at error location [2023-11-21 19:01:06,694 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-21 19:01:06,694 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-21 19:01:06,694 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 9 [2023-11-21 19:01:06,694 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [471450648] [2023-11-21 19:01:06,694 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-21 19:01:06,695 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2023-11-21 19:01:06,695 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-21 19:01:06,695 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2023-11-21 19:01:06,696 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=226, Unknown=0, NotChecked=0, Total=306 [2023-11-21 19:01:06,696 INFO L87 Difference]: Start difference. First operand 132 states and 185 transitions. Second operand has 10 states, 10 states have (on average 2.5) internal successors, (25), 9 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 19:01:07,044 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-21 19:01:07,044 INFO L93 Difference]: Finished difference Result 219 states and 264 transitions. [2023-11-21 19:01:07,045 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 12 states. [2023-11-21 19:01:07,045 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 2.5) internal successors, (25), 9 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 11 [2023-11-21 19:01:07,045 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-21 19:01:07,047 INFO L225 Difference]: With dead ends: 219 [2023-11-21 19:01:07,047 INFO L226 Difference]: Without dead ends: 219 [2023-11-21 19:01:07,047 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 44 GetRequests, 19 SyntacticMatches, 1 SemanticMatches, 24 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 152 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=178, Invalid=472, Unknown=0, NotChecked=0, Total=650 [2023-11-21 19:01:07,048 INFO L413 NwaCegarLoop]: 105 mSDtfsCounter, 259 mSDsluCounter, 439 mSDsCounter, 0 mSdLazyCounter, 267 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 259 SdHoareTripleChecker+Valid, 544 SdHoareTripleChecker+Invalid, 273 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 267 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-21 19:01:07,049 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [259 Valid, 544 Invalid, 273 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 267 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-21 19:01:07,049 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 219 states. [2023-11-21 19:01:07,052 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 219 to 152. [2023-11-21 19:01:07,053 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 152 states, 114 states have (on average 1.7982456140350878) internal successors, (205), 151 states have internal predecessors, (205), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 19:01:07,054 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 152 states to 152 states and 205 transitions. [2023-11-21 19:01:07,054 INFO L78 Accepts]: Start accepts. Automaton has 152 states and 205 transitions. Word has length 11 [2023-11-21 19:01:07,054 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-21 19:01:07,054 INFO L495 AbstractCegarLoop]: Abstraction has 152 states and 205 transitions. [2023-11-21 19:01:07,054 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 2.5) internal successors, (25), 9 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 19:01:07,054 INFO L276 IsEmpty]: Start isEmpty. Operand 152 states and 205 transitions. [2023-11-21 19:01:07,055 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2023-11-21 19:01:07,055 INFO L187 NwaCegarLoop]: Found error trace [2023-11-21 19:01:07,055 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 1, 1, 1] [2023-11-21 19:01:07,078 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4ce69841-e1ef-4fae-8aa6-b6721e567e2e/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2023-11-21 19:01:07,275 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4ce69841-e1ef-4fae-8aa6-b6721e567e2e/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 19:01:07,276 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr19REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 39 more)] === [2023-11-21 19:01:07,276 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 19:01:07,276 INFO L85 PathProgramCache]: Analyzing trace with hash -234747659, now seen corresponding path program 2 times [2023-11-21 19:01:07,277 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-21 19:01:07,277 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1759548117] [2023-11-21 19:01:07,277 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:01:07,277 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 19:01:07,289 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 19:01:07,352 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2023-11-21 19:01:07,352 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-21 19:01:07,352 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1759548117] [2023-11-21 19:01:07,353 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1759548117] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-21 19:01:07,353 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-21 19:01:07,353 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [1] imperfect sequences [] total 1 [2023-11-21 19:01:07,353 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [582855698] [2023-11-21 19:01:07,353 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-21 19:01:07,354 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-21 19:01:07,354 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-21 19:01:07,354 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-21 19:01:07,355 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-21 19:01:07,355 INFO L87 Difference]: Start difference. First operand 152 states and 205 transitions. Second operand has 3 states, 2 states have (on average 3.5) internal successors, (7), 2 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 19:01:07,426 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-21 19:01:07,426 INFO L93 Difference]: Finished difference Result 150 states and 203 transitions. [2023-11-21 19:01:07,426 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-21 19:01:07,427 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 3.5) internal successors, (7), 2 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 15 [2023-11-21 19:01:07,427 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-21 19:01:07,428 INFO L225 Difference]: With dead ends: 150 [2023-11-21 19:01:07,428 INFO L226 Difference]: Without dead ends: 150 [2023-11-21 19:01:07,428 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 1 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-21 19:01:07,429 INFO L413 NwaCegarLoop]: 54 mSDtfsCounter, 87 mSDsluCounter, 1 mSDsCounter, 0 mSdLazyCounter, 44 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 87 SdHoareTripleChecker+Valid, 55 SdHoareTripleChecker+Invalid, 47 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 44 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-21 19:01:07,430 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [87 Valid, 55 Invalid, 47 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 44 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-21 19:01:07,431 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 150 states. [2023-11-21 19:01:07,433 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 150 to 150. [2023-11-21 19:01:07,434 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 150 states, 114 states have (on average 1.780701754385965) internal successors, (203), 149 states have internal predecessors, (203), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 19:01:07,435 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 150 states to 150 states and 203 transitions. [2023-11-21 19:01:07,435 INFO L78 Accepts]: Start accepts. Automaton has 150 states and 203 transitions. Word has length 15 [2023-11-21 19:01:07,435 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-21 19:01:07,435 INFO L495 AbstractCegarLoop]: Abstraction has 150 states and 203 transitions. [2023-11-21 19:01:07,436 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 3.5) internal successors, (7), 2 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 19:01:07,436 INFO L276 IsEmpty]: Start isEmpty. Operand 150 states and 203 transitions. [2023-11-21 19:01:07,437 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2023-11-21 19:01:07,437 INFO L187 NwaCegarLoop]: Found error trace [2023-11-21 19:01:07,437 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-21 19:01:07,437 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2023-11-21 19:01:07,438 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 39 more)] === [2023-11-21 19:01:07,439 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 19:01:07,439 INFO L85 PathProgramCache]: Analyzing trace with hash -1512753252, now seen corresponding path program 2 times [2023-11-21 19:01:07,439 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-21 19:01:07,440 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [538732678] [2023-11-21 19:01:07,440 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:01:07,440 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 19:01:07,470 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 19:01:07,724 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 6 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-11-21 19:01:07,725 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-21 19:01:07,725 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [538732678] [2023-11-21 19:01:07,725 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [538732678] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-21 19:01:07,725 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1152592493] [2023-11-21 19:01:07,725 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-21 19:01:07,725 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 19:01:07,726 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4ce69841-e1ef-4fae-8aa6-b6721e567e2e/bin/utaipan-verify-QoSU8krkJ5/z3 [2023-11-21 19:01:07,727 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4ce69841-e1ef-4fae-8aa6-b6721e567e2e/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-21 19:01:07,743 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4ce69841-e1ef-4fae-8aa6-b6721e567e2e/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-11-21 19:01:07,836 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 4 check-sat command(s) [2023-11-21 19:01:07,836 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-21 19:01:07,838 INFO L262 TraceCheckSpWp]: Trace formula consists of 201 conjuncts, 17 conjunts are in the unsatisfiable core [2023-11-21 19:01:07,840 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-21 19:01:07,867 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2023-11-21 19:01:07,900 INFO L349 Elim1Store]: treesize reduction 20, result has 33.3 percent of original size [2023-11-21 19:01:07,900 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 19 treesize of output 16 [2023-11-21 19:01:07,920 INFO L349 Elim1Store]: treesize reduction 13, result has 40.9 percent of original size [2023-11-21 19:01:07,921 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 14 treesize of output 13 [2023-11-21 19:01:07,968 INFO L349 Elim1Store]: treesize reduction 32, result has 37.3 percent of original size [2023-11-21 19:01:07,968 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 3 case distinctions, treesize of input 19 treesize of output 25 [2023-11-21 19:01:08,020 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 4 proven. 5 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-11-21 19:01:08,020 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-21 19:01:08,103 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 3 proven. 4 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2023-11-21 19:01:08,103 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1152592493] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-21 19:01:08,103 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [240749768] [2023-11-21 19:01:08,106 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2023-11-21 19:01:08,106 INFO L166 IcfgInterpreter]: Building call graph [2023-11-21 19:01:08,106 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-21 19:01:08,107 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-21 19:01:08,107 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-21 19:01:09,402 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-21 19:01:10,393 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2627#(and (= 3 |ULTIMATE.start_node_create_with_sublist_#in~sublist_length#1|) (<= 1 |#StackHeapBarrier|) (= 3 |ULTIMATE.start_sll_append_#in~sublist_length#1|) (not (= (select |#valid| |ULTIMATE.start_node_create_with_sublist_~new_node~0#1.base|) 1)) (= |ULTIMATE.start_sll_append_~sublist_length#1| 3) (= 3 |ULTIMATE.start_main_~i~0#1|) (= 5 |ULTIMATE.start_main_~max~0#1|) (<= 2 |ULTIMATE.start_sll_append_#in~head#1.base|) (= |ULTIMATE.start_node_create_with_sublist_#t~ret6#1.base| |ULTIMATE.start_sll_create_#res#1.base|) (= |ULTIMATE.start_main_~#head~1#1.offset| 0) (= |ULTIMATE.start_sll_append_~head#1.offset| 0) (= |ULTIMATE.start_sll_create_#res#1.offset| 0) (= |ULTIMATE.start_node_create_with_sublist_~sublist_length#1| 3) (= |ULTIMATE.start_node_create_with_sublist_~new_node~0#1.offset| 0) (= 3 |ULTIMATE.start_main_~min~0#1|) (<= 2 |ULTIMATE.start_sll_append_~head#1.base|) (<= 2 |ULTIMATE.start_main_~#head~1#1.base|) (= |ULTIMATE.start_main_~j~0#1| 0) (= |ULTIMATE.start_sll_append_#in~head#1.offset| 0) (= 0 |ULTIMATE.start_node_create_with_sublist_#t~ret6#1.offset|))' at error location [2023-11-21 19:01:10,393 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-21 19:01:10,393 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-21 19:01:10,393 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 5, 4] total 8 [2023-11-21 19:01:10,393 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [92748776] [2023-11-21 19:01:10,393 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-21 19:01:10,393 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2023-11-21 19:01:10,395 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-21 19:01:10,396 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2023-11-21 19:01:10,396 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=55, Invalid=217, Unknown=0, NotChecked=0, Total=272 [2023-11-21 19:01:10,396 INFO L87 Difference]: Start difference. First operand 150 states and 203 transitions. Second operand has 9 states, 8 states have (on average 3.5) internal successors, (28), 9 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 19:01:10,554 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-21 19:01:10,554 INFO L93 Difference]: Finished difference Result 148 states and 197 transitions. [2023-11-21 19:01:10,554 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-11-21 19:01:10,555 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 8 states have (on average 3.5) internal successors, (28), 9 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 17 [2023-11-21 19:01:10,555 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-21 19:01:10,556 INFO L225 Difference]: With dead ends: 148 [2023-11-21 19:01:10,556 INFO L226 Difference]: Without dead ends: 148 [2023-11-21 19:01:10,556 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 39 SyntacticMatches, 3 SemanticMatches, 16 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 99 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=64, Invalid=242, Unknown=0, NotChecked=0, Total=306 [2023-11-21 19:01:10,557 INFO L413 NwaCegarLoop]: 67 mSDtfsCounter, 10 mSDsluCounter, 132 mSDsCounter, 0 mSdLazyCounter, 172 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 199 SdHoareTripleChecker+Invalid, 174 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 172 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-21 19:01:10,557 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [10 Valid, 199 Invalid, 174 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 172 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-21 19:01:10,558 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 148 states. [2023-11-21 19:01:10,560 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 148 to 148. [2023-11-21 19:01:10,561 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 148 states, 114 states have (on average 1.7280701754385965) internal successors, (197), 147 states have internal predecessors, (197), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 19:01:10,561 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 148 states to 148 states and 197 transitions. [2023-11-21 19:01:10,562 INFO L78 Accepts]: Start accepts. Automaton has 148 states and 197 transitions. Word has length 17 [2023-11-21 19:01:10,562 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-21 19:01:10,562 INFO L495 AbstractCegarLoop]: Abstraction has 148 states and 197 transitions. [2023-11-21 19:01:10,562 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 8 states have (on average 3.5) internal successors, (28), 9 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 19:01:10,562 INFO L276 IsEmpty]: Start isEmpty. Operand 148 states and 197 transitions. [2023-11-21 19:01:10,563 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2023-11-21 19:01:10,563 INFO L187 NwaCegarLoop]: Found error trace [2023-11-21 19:01:10,563 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-21 19:01:10,588 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4ce69841-e1ef-4fae-8aa6-b6721e567e2e/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2023-11-21 19:01:10,775 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4ce69841-e1ef-4fae-8aa6-b6721e567e2e/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable8 [2023-11-21 19:01:10,776 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 39 more)] === [2023-11-21 19:01:10,776 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 19:01:10,776 INFO L85 PathProgramCache]: Analyzing trace with hash -1512753251, now seen corresponding path program 1 times [2023-11-21 19:01:10,776 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-21 19:01:10,776 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [417855792] [2023-11-21 19:01:10,776 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:01:10,776 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 19:01:10,803 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 19:01:11,041 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2023-11-21 19:01:11,041 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-21 19:01:11,041 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [417855792] [2023-11-21 19:01:11,042 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [417855792] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-21 19:01:11,042 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1578597270] [2023-11-21 19:01:11,042 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:01:11,042 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 19:01:11,042 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4ce69841-e1ef-4fae-8aa6-b6721e567e2e/bin/utaipan-verify-QoSU8krkJ5/z3 [2023-11-21 19:01:11,050 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4ce69841-e1ef-4fae-8aa6-b6721e567e2e/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-21 19:01:11,053 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4ce69841-e1ef-4fae-8aa6-b6721e567e2e/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-11-21 19:01:11,159 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 19:01:11,161 INFO L262 TraceCheckSpWp]: Trace formula consists of 201 conjuncts, 19 conjunts are in the unsatisfiable core [2023-11-21 19:01:11,163 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-21 19:01:11,171 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2023-11-21 19:01:11,175 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 1 [2023-11-21 19:01:11,201 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-21 19:01:11,202 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 9 [2023-11-21 19:01:11,217 INFO L349 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2023-11-21 19:01:11,217 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 17 treesize of output 21 [2023-11-21 19:01:11,273 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-21 19:01:11,274 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 9 [2023-11-21 19:01:11,287 INFO L349 Elim1Store]: treesize reduction 8, result has 52.9 percent of original size [2023-11-21 19:01:11,287 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 16 treesize of output 18 [2023-11-21 19:01:11,320 INFO L349 Elim1Store]: treesize reduction 13, result has 40.9 percent of original size [2023-11-21 19:01:11,321 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 14 treesize of output 13 [2023-11-21 19:01:11,363 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 1 proven. 8 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-11-21 19:01:11,363 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-21 19:01:11,847 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 1 proven. 11 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-21 19:01:11,847 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1578597270] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-21 19:01:11,847 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1561462283] [2023-11-21 19:01:11,850 INFO L159 IcfgInterpreter]: Started Sifa with 11 locations of interest [2023-11-21 19:01:11,850 INFO L166 IcfgInterpreter]: Building call graph [2023-11-21 19:01:11,851 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-21 19:01:11,851 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-21 19:01:11,851 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-21 19:01:13,058 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-21 19:01:14,084 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3041#(and (= 3 |ULTIMATE.start_node_create_with_sublist_#in~sublist_length#1|) (<= 1 |#StackHeapBarrier|) (= 3 |ULTIMATE.start_sll_append_#in~sublist_length#1|) (= |ULTIMATE.start_sll_append_~sublist_length#1| 3) (= 3 |ULTIMATE.start_main_~i~0#1|) (= 5 |ULTIMATE.start_main_~max~0#1|) (<= 2 |ULTIMATE.start_sll_append_#in~head#1.base|) (= |ULTIMATE.start_node_create_with_sublist_#t~ret6#1.base| |ULTIMATE.start_sll_create_#res#1.base|) (= |ULTIMATE.start_main_~#head~1#1.offset| 0) (= |ULTIMATE.start_sll_append_~head#1.offset| 0) (= |ULTIMATE.start_sll_create_#res#1.offset| 0) (= |ULTIMATE.start_node_create_with_sublist_~sublist_length#1| 3) (= |ULTIMATE.start_node_create_with_sublist_~new_node~0#1.offset| 0) (= 3 |ULTIMATE.start_main_~min~0#1|) (<= 2 |ULTIMATE.start_sll_append_~head#1.base|) (<= 2 |ULTIMATE.start_main_~#head~1#1.base|) (= |ULTIMATE.start_main_~j~0#1| 0) (<= (select |#length| |ULTIMATE.start_node_create_with_sublist_~new_node~0#1.base|) 7) (= |ULTIMATE.start_sll_append_#in~head#1.offset| 0) (= 0 |ULTIMATE.start_node_create_with_sublist_#t~ret6#1.offset|))' at error location [2023-11-21 19:01:14,084 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-21 19:01:14,084 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-21 19:01:14,084 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 5] total 11 [2023-11-21 19:01:14,085 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [970646287] [2023-11-21 19:01:14,085 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-21 19:01:14,085 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2023-11-21 19:01:14,085 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-21 19:01:14,086 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2023-11-21 19:01:14,086 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=80, Invalid=300, Unknown=0, NotChecked=0, Total=380 [2023-11-21 19:01:14,086 INFO L87 Difference]: Start difference. First operand 148 states and 197 transitions. Second operand has 12 states, 11 states have (on average 3.6363636363636362) internal successors, (40), 12 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 19:01:14,405 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-21 19:01:14,405 INFO L93 Difference]: Finished difference Result 146 states and 191 transitions. [2023-11-21 19:01:14,405 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-11-21 19:01:14,406 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 11 states have (on average 3.6363636363636362) internal successors, (40), 12 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 17 [2023-11-21 19:01:14,406 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-21 19:01:14,407 INFO L225 Difference]: With dead ends: 146 [2023-11-21 19:01:14,407 INFO L226 Difference]: Without dead ends: 146 [2023-11-21 19:01:14,407 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 58 GetRequests, 37 SyntacticMatches, 1 SemanticMatches, 20 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 119 ImplicationChecksByTransitivity, 1.3s TimeCoverageRelationStatistics Valid=105, Invalid=357, Unknown=0, NotChecked=0, Total=462 [2023-11-21 19:01:14,408 INFO L413 NwaCegarLoop]: 67 mSDtfsCounter, 9 mSDsluCounter, 163 mSDsCounter, 0 mSdLazyCounter, 213 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 9 SdHoareTripleChecker+Valid, 230 SdHoareTripleChecker+Invalid, 215 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 213 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-11-21 19:01:14,408 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [9 Valid, 230 Invalid, 215 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 213 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-11-21 19:01:14,409 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 146 states. [2023-11-21 19:01:14,411 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 146 to 146. [2023-11-21 19:01:14,412 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 146 states, 114 states have (on average 1.6754385964912282) internal successors, (191), 145 states have internal predecessors, (191), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 19:01:14,412 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 146 states to 146 states and 191 transitions. [2023-11-21 19:01:14,413 INFO L78 Accepts]: Start accepts. Automaton has 146 states and 191 transitions. Word has length 17 [2023-11-21 19:01:14,413 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-21 19:01:14,413 INFO L495 AbstractCegarLoop]: Abstraction has 146 states and 191 transitions. [2023-11-21 19:01:14,413 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 11 states have (on average 3.6363636363636362) internal successors, (40), 12 states have internal predecessors, (40), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 19:01:14,413 INFO L276 IsEmpty]: Start isEmpty. Operand 146 states and 191 transitions. [2023-11-21 19:01:14,414 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2023-11-21 19:01:14,414 INFO L187 NwaCegarLoop]: Found error trace [2023-11-21 19:01:14,414 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1] [2023-11-21 19:01:14,436 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4ce69841-e1ef-4fae-8aa6-b6721e567e2e/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2023-11-21 19:01:14,615 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4ce69841-e1ef-4fae-8aa6-b6721e567e2e/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable9 [2023-11-21 19:01:14,615 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr20REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 39 more)] === [2023-11-21 19:01:14,616 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 19:01:14,616 INFO L85 PathProgramCache]: Analyzing trace with hash -1471660772, now seen corresponding path program 1 times [2023-11-21 19:01:14,616 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-21 19:01:14,616 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [412494836] [2023-11-21 19:01:14,616 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:01:14,617 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 19:01:14,626 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 19:01:14,702 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2023-11-21 19:01:14,702 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-21 19:01:14,703 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [412494836] [2023-11-21 19:01:14,703 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [412494836] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-21 19:01:14,703 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-21 19:01:14,703 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-11-21 19:01:14,703 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1422297494] [2023-11-21 19:01:14,703 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-21 19:01:14,704 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-11-21 19:01:14,704 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-21 19:01:14,704 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-11-21 19:01:14,704 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-11-21 19:01:14,704 INFO L87 Difference]: Start difference. First operand 146 states and 191 transitions. Second operand has 4 states, 4 states have (on average 2.75) internal successors, (11), 3 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 19:01:14,799 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-21 19:01:14,799 INFO L93 Difference]: Finished difference Result 201 states and 252 transitions. [2023-11-21 19:01:14,799 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-11-21 19:01:14,799 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.75) internal successors, (11), 3 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 19 [2023-11-21 19:01:14,800 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-21 19:01:14,801 INFO L225 Difference]: With dead ends: 201 [2023-11-21 19:01:14,801 INFO L226 Difference]: Without dead ends: 201 [2023-11-21 19:01:14,801 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2023-11-21 19:01:14,802 INFO L413 NwaCegarLoop]: 69 mSDtfsCounter, 87 mSDsluCounter, 107 mSDsCounter, 0 mSdLazyCounter, 74 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 87 SdHoareTripleChecker+Valid, 176 SdHoareTripleChecker+Invalid, 76 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 74 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-21 19:01:14,802 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [87 Valid, 176 Invalid, 76 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 74 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-21 19:01:14,803 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 201 states. [2023-11-21 19:01:14,806 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 201 to 161. [2023-11-21 19:01:14,806 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 161 states, 129 states have (on average 1.627906976744186) internal successors, (210), 160 states have internal predecessors, (210), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 19:01:14,807 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 161 states to 161 states and 210 transitions. [2023-11-21 19:01:14,807 INFO L78 Accepts]: Start accepts. Automaton has 161 states and 210 transitions. Word has length 19 [2023-11-21 19:01:14,807 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-21 19:01:14,807 INFO L495 AbstractCegarLoop]: Abstraction has 161 states and 210 transitions. [2023-11-21 19:01:14,808 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 2.75) internal successors, (11), 3 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 19:01:14,808 INFO L276 IsEmpty]: Start isEmpty. Operand 161 states and 210 transitions. [2023-11-21 19:01:14,808 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2023-11-21 19:01:14,808 INFO L187 NwaCegarLoop]: Found error trace [2023-11-21 19:01:14,809 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1] [2023-11-21 19:01:14,809 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2023-11-21 19:01:14,809 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr28REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 39 more)] === [2023-11-21 19:01:14,809 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 19:01:14,809 INFO L85 PathProgramCache]: Analyzing trace with hash -1466628850, now seen corresponding path program 1 times [2023-11-21 19:01:14,810 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-21 19:01:14,810 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [417094897] [2023-11-21 19:01:14,810 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:01:14,810 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 19:01:14,819 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 19:01:14,882 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2023-11-21 19:01:14,882 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-21 19:01:14,882 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [417094897] [2023-11-21 19:01:14,882 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [417094897] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-21 19:01:14,882 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-21 19:01:14,882 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-11-21 19:01:14,883 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2053297966] [2023-11-21 19:01:14,883 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-21 19:01:14,883 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-11-21 19:01:14,883 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-21 19:01:14,883 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-11-21 19:01:14,884 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-11-21 19:01:14,884 INFO L87 Difference]: Start difference. First operand 161 states and 210 transitions. Second operand has 4 states, 4 states have (on average 2.75) internal successors, (11), 3 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 19:01:14,980 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-21 19:01:14,980 INFO L93 Difference]: Finished difference Result 179 states and 228 transitions. [2023-11-21 19:01:14,981 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-11-21 19:01:14,981 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 2.75) internal successors, (11), 3 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 19 [2023-11-21 19:01:14,981 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-21 19:01:14,982 INFO L225 Difference]: With dead ends: 179 [2023-11-21 19:01:14,982 INFO L226 Difference]: Without dead ends: 179 [2023-11-21 19:01:14,982 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=9, Invalid=11, Unknown=0, NotChecked=0, Total=20 [2023-11-21 19:01:14,983 INFO L413 NwaCegarLoop]: 69 mSDtfsCounter, 6 mSDsluCounter, 123 mSDsCounter, 0 mSdLazyCounter, 86 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 192 SdHoareTripleChecker+Invalid, 86 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 86 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-21 19:01:14,983 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [6 Valid, 192 Invalid, 86 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 86 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-21 19:01:14,984 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 179 states. [2023-11-21 19:01:14,987 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 179 to 164. [2023-11-21 19:01:14,987 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 164 states, 132 states have (on average 1.6136363636363635) internal successors, (213), 163 states have internal predecessors, (213), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 19:01:14,988 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 164 states to 164 states and 213 transitions. [2023-11-21 19:01:14,988 INFO L78 Accepts]: Start accepts. Automaton has 164 states and 213 transitions. Word has length 19 [2023-11-21 19:01:14,988 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-21 19:01:14,988 INFO L495 AbstractCegarLoop]: Abstraction has 164 states and 213 transitions. [2023-11-21 19:01:14,989 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 2.75) internal successors, (11), 3 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 19:01:14,989 INFO L276 IsEmpty]: Start isEmpty. Operand 164 states and 213 transitions. [2023-11-21 19:01:14,989 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2023-11-21 19:01:14,989 INFO L187 NwaCegarLoop]: Found error trace [2023-11-21 19:01:14,989 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1] [2023-11-21 19:01:14,990 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11 [2023-11-21 19:01:14,990 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr41ASSERT_VIOLATIONMEMORY_LEAK === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 39 more)] === [2023-11-21 19:01:14,990 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 19:01:14,990 INFO L85 PathProgramCache]: Analyzing trace with hash -1466626257, now seen corresponding path program 1 times [2023-11-21 19:01:14,990 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-21 19:01:14,990 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1960823866] [2023-11-21 19:01:14,991 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:01:14,991 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 19:01:15,002 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 19:01:15,057 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 15 trivial. 0 not checked. [2023-11-21 19:01:15,057 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-21 19:01:15,057 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1960823866] [2023-11-21 19:01:15,057 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1960823866] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-21 19:01:15,057 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-21 19:01:15,058 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-11-21 19:01:15,058 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [657966924] [2023-11-21 19:01:15,058 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-21 19:01:15,058 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-11-21 19:01:15,058 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-21 19:01:15,059 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-11-21 19:01:15,059 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-11-21 19:01:15,059 INFO L87 Difference]: Start difference. First operand 164 states and 213 transitions. Second operand has 4 states, 3 states have (on average 3.6666666666666665) internal successors, (11), 3 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 19:01:15,162 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-21 19:01:15,163 INFO L93 Difference]: Finished difference Result 165 states and 213 transitions. [2023-11-21 19:01:15,163 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-11-21 19:01:15,163 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 3.6666666666666665) internal successors, (11), 3 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 19 [2023-11-21 19:01:15,163 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-21 19:01:15,164 INFO L225 Difference]: With dead ends: 165 [2023-11-21 19:01:15,165 INFO L226 Difference]: Without dead ends: 160 [2023-11-21 19:01:15,165 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 0 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-11-21 19:01:15,166 INFO L413 NwaCegarLoop]: 69 mSDtfsCounter, 0 mSDsluCounter, 94 mSDsCounter, 0 mSdLazyCounter, 115 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 0 SdHoareTripleChecker+Valid, 163 SdHoareTripleChecker+Invalid, 115 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 115 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-21 19:01:15,166 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [0 Valid, 163 Invalid, 115 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 115 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-21 19:01:15,167 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 160 states. [2023-11-21 19:01:15,169 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 160 to 158. [2023-11-21 19:01:15,170 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 158 states, 126 states have (on average 1.6349206349206349) internal successors, (206), 157 states have internal predecessors, (206), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 19:01:15,170 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 158 states to 158 states and 206 transitions. [2023-11-21 19:01:15,170 INFO L78 Accepts]: Start accepts. Automaton has 158 states and 206 transitions. Word has length 19 [2023-11-21 19:01:15,171 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-21 19:01:15,171 INFO L495 AbstractCegarLoop]: Abstraction has 158 states and 206 transitions. [2023-11-21 19:01:15,171 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 3.6666666666666665) internal successors, (11), 3 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 19:01:15,171 INFO L276 IsEmpty]: Start isEmpty. Operand 158 states and 206 transitions. [2023-11-21 19:01:15,172 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2023-11-21 19:01:15,172 INFO L187 NwaCegarLoop]: Found error trace [2023-11-21 19:01:15,172 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-21 19:01:15,172 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2023-11-21 19:01:15,172 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr6REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 39 more)] === [2023-11-21 19:01:15,173 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 19:01:15,173 INFO L85 PathProgramCache]: Analyzing trace with hash -2056707677, now seen corresponding path program 1 times [2023-11-21 19:01:15,173 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-21 19:01:15,173 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1435751133] [2023-11-21 19:01:15,173 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:01:15,173 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 19:01:15,193 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 19:01:15,248 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2023-11-21 19:01:15,249 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-21 19:01:15,249 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1435751133] [2023-11-21 19:01:15,249 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1435751133] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-21 19:01:15,249 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-21 19:01:15,249 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-11-21 19:01:15,249 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [148607040] [2023-11-21 19:01:15,249 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-21 19:01:15,250 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-11-21 19:01:15,250 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-21 19:01:15,250 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-11-21 19:01:15,250 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-11-21 19:01:15,250 INFO L87 Difference]: Start difference. First operand 158 states and 206 transitions. Second operand has 4 states, 3 states have (on average 4.333333333333333) internal successors, (13), 4 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 19:01:15,340 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-21 19:01:15,340 INFO L93 Difference]: Finished difference Result 157 states and 203 transitions. [2023-11-21 19:01:15,341 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-11-21 19:01:15,341 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 3 states have (on average 4.333333333333333) internal successors, (13), 4 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 19 [2023-11-21 19:01:15,341 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-21 19:01:15,342 INFO L225 Difference]: With dead ends: 157 [2023-11-21 19:01:15,342 INFO L226 Difference]: Without dead ends: 157 [2023-11-21 19:01:15,342 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 2 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=5, Invalid=7, Unknown=0, NotChecked=0, Total=12 [2023-11-21 19:01:15,343 INFO L413 NwaCegarLoop]: 57 mSDtfsCounter, 26 mSDsluCounter, 79 mSDsCounter, 0 mSdLazyCounter, 110 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 26 SdHoareTripleChecker+Valid, 136 SdHoareTripleChecker+Invalid, 112 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 110 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-21 19:01:15,343 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [26 Valid, 136 Invalid, 112 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 110 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-21 19:01:15,344 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 157 states. [2023-11-21 19:01:15,346 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 157 to 157. [2023-11-21 19:01:15,347 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 157 states, 126 states have (on average 1.6111111111111112) internal successors, (203), 156 states have internal predecessors, (203), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 19:01:15,347 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 157 states to 157 states and 203 transitions. [2023-11-21 19:01:15,347 INFO L78 Accepts]: Start accepts. Automaton has 157 states and 203 transitions. Word has length 19 [2023-11-21 19:01:15,348 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-21 19:01:15,348 INFO L495 AbstractCegarLoop]: Abstraction has 157 states and 203 transitions. [2023-11-21 19:01:15,348 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 3 states have (on average 4.333333333333333) internal successors, (13), 4 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 19:01:15,348 INFO L276 IsEmpty]: Start isEmpty. Operand 157 states and 203 transitions. [2023-11-21 19:01:15,348 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2023-11-21 19:01:15,349 INFO L187 NwaCegarLoop]: Found error trace [2023-11-21 19:01:15,349 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-21 19:01:15,349 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable13 [2023-11-21 19:01:15,349 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr7REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 39 more)] === [2023-11-21 19:01:15,349 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 19:01:15,350 INFO L85 PathProgramCache]: Analyzing trace with hash -2056707676, now seen corresponding path program 1 times [2023-11-21 19:01:15,350 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-21 19:01:15,350 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1396123454] [2023-11-21 19:01:15,350 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:01:15,350 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 19:01:15,371 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 19:01:15,478 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2023-11-21 19:01:15,478 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-21 19:01:15,478 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1396123454] [2023-11-21 19:01:15,478 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1396123454] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-21 19:01:15,478 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-21 19:01:15,478 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-11-21 19:01:15,479 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [291080622] [2023-11-21 19:01:15,479 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-21 19:01:15,479 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-11-21 19:01:15,479 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-21 19:01:15,480 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-11-21 19:01:15,480 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2023-11-21 19:01:15,480 INFO L87 Difference]: Start difference. First operand 157 states and 203 transitions. Second operand has 5 states, 4 states have (on average 3.25) internal successors, (13), 5 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 19:01:15,563 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-21 19:01:15,563 INFO L93 Difference]: Finished difference Result 156 states and 200 transitions. [2023-11-21 19:01:15,564 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-11-21 19:01:15,564 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 3.25) internal successors, (13), 5 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 19 [2023-11-21 19:01:15,564 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-21 19:01:15,565 INFO L225 Difference]: With dead ends: 156 [2023-11-21 19:01:15,566 INFO L226 Difference]: Without dead ends: 156 [2023-11-21 19:01:15,567 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 4 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 3 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=8, Invalid=12, Unknown=0, NotChecked=0, Total=20 [2023-11-21 19:01:15,568 INFO L413 NwaCegarLoop]: 57 mSDtfsCounter, 25 mSDsluCounter, 95 mSDsCounter, 0 mSdLazyCounter, 92 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 25 SdHoareTripleChecker+Valid, 152 SdHoareTripleChecker+Invalid, 94 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 92 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-21 19:01:15,569 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [25 Valid, 152 Invalid, 94 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 92 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-21 19:01:15,570 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 156 states. [2023-11-21 19:01:15,573 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 156 to 156. [2023-11-21 19:01:15,573 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 156 states, 126 states have (on average 1.5873015873015872) internal successors, (200), 155 states have internal predecessors, (200), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 19:01:15,574 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 156 states to 156 states and 200 transitions. [2023-11-21 19:01:15,574 INFO L78 Accepts]: Start accepts. Automaton has 156 states and 200 transitions. Word has length 19 [2023-11-21 19:01:15,575 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-21 19:01:15,575 INFO L495 AbstractCegarLoop]: Abstraction has 156 states and 200 transitions. [2023-11-21 19:01:15,575 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 3.25) internal successors, (13), 5 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 19:01:15,575 INFO L276 IsEmpty]: Start isEmpty. Operand 156 states and 200 transitions. [2023-11-21 19:01:15,578 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2023-11-21 19:01:15,578 INFO L187 NwaCegarLoop]: Found error trace [2023-11-21 19:01:15,579 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-21 19:01:15,579 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable14 [2023-11-21 19:01:15,579 INFO L420 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 39 more)] === [2023-11-21 19:01:15,580 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 19:01:15,580 INFO L85 PathProgramCache]: Analyzing trace with hash 666571502, now seen corresponding path program 1 times [2023-11-21 19:01:15,580 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-21 19:01:15,580 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1010294608] [2023-11-21 19:01:15,580 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:01:15,581 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 19:01:15,629 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 19:01:16,001 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 9 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-11-21 19:01:16,002 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-21 19:01:16,002 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1010294608] [2023-11-21 19:01:16,002 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1010294608] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-21 19:01:16,002 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1009314816] [2023-11-21 19:01:16,002 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:01:16,003 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 19:01:16,003 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4ce69841-e1ef-4fae-8aa6-b6721e567e2e/bin/utaipan-verify-QoSU8krkJ5/z3 [2023-11-21 19:01:16,004 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4ce69841-e1ef-4fae-8aa6-b6721e567e2e/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-21 19:01:16,019 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4ce69841-e1ef-4fae-8aa6-b6721e567e2e/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-11-21 19:01:16,142 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 19:01:16,144 INFO L262 TraceCheckSpWp]: Trace formula consists of 257 conjuncts, 22 conjunts are in the unsatisfiable core [2023-11-21 19:01:16,147 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-21 19:01:16,153 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 1 [2023-11-21 19:01:16,189 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-21 19:01:16,190 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 9 [2023-11-21 19:01:16,216 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-21 19:01:16,217 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 9 [2023-11-21 19:01:16,237 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-21 19:01:16,238 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 9 [2023-11-21 19:01:16,262 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-21 19:01:16,263 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 9 [2023-11-21 19:01:16,286 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2023-11-21 19:01:16,286 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-21 19:01:18,428 WARN L854 $PredicateComparison]: unable to prove that (and (<= 0 |c_ULTIMATE.start_sll_append_~head#1.offset|) (forall ((|v_ULTIMATE.start_sll_create_~new_head~0#1.base_46| Int)) (or (< |c_#StackHeapBarrier| (+ |v_ULTIMATE.start_sll_create_~new_head~0#1.base_46| 1)) (forall ((v_ArrVal_356 Int) (|v_ULTIMATE.start_sll_create_~new_head~0#1.base_45| Int)) (or (< |c_#StackHeapBarrier| (+ |v_ULTIMATE.start_sll_create_~new_head~0#1.base_45| 1)) (forall ((v_ArrVal_357 Int)) (<= (+ |c_ULTIMATE.start_sll_append_~head#1.offset| 4) (select (store (store |c_#length| |v_ULTIMATE.start_sll_create_~new_head~0#1.base_46| v_ArrVal_356) |v_ULTIMATE.start_sll_create_~new_head~0#1.base_45| v_ArrVal_357) |c_ULTIMATE.start_sll_append_~head#1.base|)))))))) is different from false [2023-11-21 19:01:20,513 WARN L854 $PredicateComparison]: unable to prove that (and (<= 0 |c_ULTIMATE.start_sll_append_~head#1.offset|) (forall ((|v_ULTIMATE.start_sll_create_~new_head~0#1.base_47| Int)) (or (forall ((v_ArrVal_355 Int) (|v_ULTIMATE.start_sll_create_~new_head~0#1.base_46| Int)) (or (< |c_#StackHeapBarrier| (+ |v_ULTIMATE.start_sll_create_~new_head~0#1.base_46| 1)) (forall ((v_ArrVal_356 Int) (|v_ULTIMATE.start_sll_create_~new_head~0#1.base_45| Int)) (or (< |c_#StackHeapBarrier| (+ |v_ULTIMATE.start_sll_create_~new_head~0#1.base_45| 1)) (forall ((v_ArrVal_357 Int)) (<= (+ |c_ULTIMATE.start_sll_append_~head#1.offset| 4) (select (store (store (store |c_#length| |v_ULTIMATE.start_sll_create_~new_head~0#1.base_47| v_ArrVal_355) |v_ULTIMATE.start_sll_create_~new_head~0#1.base_46| v_ArrVal_356) |v_ULTIMATE.start_sll_create_~new_head~0#1.base_45| v_ArrVal_357) |c_ULTIMATE.start_sll_append_~head#1.base|))))))) (< |c_#StackHeapBarrier| (+ |v_ULTIMATE.start_sll_create_~new_head~0#1.base_47| 1))))) is different from false [2023-11-21 19:01:22,660 WARN L854 $PredicateComparison]: unable to prove that (and (<= 0 |c_ULTIMATE.start_main_~#head~1#1.offset|) (forall ((|v_ULTIMATE.start_node_create_with_sublist_~new_node~0#1.base_26| Int)) (or (< |c_#StackHeapBarrier| (+ |v_ULTIMATE.start_node_create_with_sublist_~new_node~0#1.base_26| 1)) (forall ((v_ArrVal_354 Int) (|v_ULTIMATE.start_sll_create_~new_head~0#1.base_47| Int)) (or (forall ((v_ArrVal_355 Int) (|v_ULTIMATE.start_sll_create_~new_head~0#1.base_46| Int)) (or (forall ((v_ArrVal_356 Int) (|v_ULTIMATE.start_sll_create_~new_head~0#1.base_45| Int)) (or (forall ((v_ArrVal_357 Int)) (<= (+ 4 |c_ULTIMATE.start_main_~#head~1#1.offset|) (select (store (store (store (store |c_#length| |v_ULTIMATE.start_node_create_with_sublist_~new_node~0#1.base_26| v_ArrVal_354) |v_ULTIMATE.start_sll_create_~new_head~0#1.base_47| v_ArrVal_355) |v_ULTIMATE.start_sll_create_~new_head~0#1.base_46| v_ArrVal_356) |v_ULTIMATE.start_sll_create_~new_head~0#1.base_45| v_ArrVal_357) |c_ULTIMATE.start_main_~#head~1#1.base|))) (< |c_#StackHeapBarrier| (+ |v_ULTIMATE.start_sll_create_~new_head~0#1.base_45| 1)))) (< |c_#StackHeapBarrier| (+ |v_ULTIMATE.start_sll_create_~new_head~0#1.base_46| 1)))) (< |c_#StackHeapBarrier| (+ |v_ULTIMATE.start_sll_create_~new_head~0#1.base_47| 1))))))) is different from false [2023-11-21 19:01:22,755 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 3 refuted. 0 times theorem prover too weak. 0 trivial. 9 not checked. [2023-11-21 19:01:22,755 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1009314816] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-21 19:01:22,755 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [274000062] [2023-11-21 19:01:22,758 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-11-21 19:01:22,758 INFO L166 IcfgInterpreter]: Building call graph [2023-11-21 19:01:22,758 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-21 19:01:22,758 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-21 19:01:22,759 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-21 19:01:23,988 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-21 19:01:25,630 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5150#(and (<= 1 |#StackHeapBarrier|) (= (select |#valid| |ULTIMATE.start_sll_append_~new_last~0#1.base|) 1) (= 3 |ULTIMATE.start_sll_append_#in~sublist_length#1|) (exists ((|v_#memory_$Pointer$.offset_84| (Array Int (Array Int Int)))) (= |#memory_$Pointer$.offset| (store (store |v_#memory_$Pointer$.offset_84| |ULTIMATE.start_node_create_with_sublist_#res#1.base| (store (store (select |v_#memory_$Pointer$.offset_84| |ULTIMATE.start_node_create_with_sublist_#res#1.base|) 4 0) 0 0)) |ULTIMATE.start_sll_append_~new_last~0#1.base| (store (select (store |v_#memory_$Pointer$.offset_84| |ULTIMATE.start_node_create_with_sublist_#res#1.base| (store (store (select |v_#memory_$Pointer$.offset_84| |ULTIMATE.start_node_create_with_sublist_#res#1.base|) 4 0) 0 0)) |ULTIMATE.start_sll_append_~new_last~0#1.base|) 0 0)))) (= |ULTIMATE.start_node_create_with_sublist_#res#1.offset| 0) (= |ULTIMATE.start_sll_append_~sublist_length#1| 3) (= 3 |ULTIMATE.start_main_~i~0#1|) (= 5 |ULTIMATE.start_main_~max~0#1|) (<= 2 |ULTIMATE.start_sll_append_#in~head#1.base|) (= |ULTIMATE.start_main_~#head~1#1.offset| 0) (= |ULTIMATE.start_sll_append_~head#1.offset| 0) (exists ((|v_#memory_int_53| (Array Int (Array Int Int))) (|v_#memory_int_54| (Array Int (Array Int Int))) (|v_#memory_int_55| (Array Int (Array Int Int)))) (and (= |#memory_int| (store |v_#memory_int_55| |ULTIMATE.start_sll_append_~new_last~0#1.base| (store (select |v_#memory_int_55| |ULTIMATE.start_sll_append_~new_last~0#1.base|) 0 (select (select |#memory_int| |ULTIMATE.start_sll_append_~new_last~0#1.base|) 0)))) (= |v_#memory_int_55| (store |v_#memory_int_54| |ULTIMATE.start_node_create_with_sublist_#res#1.base| (store (select |v_#memory_int_54| |ULTIMATE.start_node_create_with_sublist_#res#1.base|) 0 (select (select |v_#memory_int_55| |ULTIMATE.start_node_create_with_sublist_#res#1.base|) 0)))) (= (store |v_#memory_int_53| |ULTIMATE.start_node_create_with_sublist_#res#1.base| (store (select |v_#memory_int_53| |ULTIMATE.start_node_create_with_sublist_#res#1.base|) 4 (select (select |v_#memory_int_54| |ULTIMATE.start_node_create_with_sublist_#res#1.base|) 4))) |v_#memory_int_54|))) (= |ULTIMATE.start_sll_create_#res#1.offset| 0) (= 3 |ULTIMATE.start_main_~min~0#1|) (<= 2 |ULTIMATE.start_sll_append_~head#1.base|) (<= 2 |ULTIMATE.start_main_~#head~1#1.base|) (exists ((|v_#memory_$Pointer$.base_84| (Array Int (Array Int Int)))) (= |#memory_$Pointer$.base| (store (store |v_#memory_$Pointer$.base_84| |ULTIMATE.start_node_create_with_sublist_#res#1.base| (store (store (select |v_#memory_$Pointer$.base_84| |ULTIMATE.start_node_create_with_sublist_#res#1.base|) 4 |ULTIMATE.start_sll_create_#res#1.base|) 0 0)) |ULTIMATE.start_sll_append_~new_last~0#1.base| (store (select (store |v_#memory_$Pointer$.base_84| |ULTIMATE.start_node_create_with_sublist_#res#1.base| (store (store (select |v_#memory_$Pointer$.base_84| |ULTIMATE.start_node_create_with_sublist_#res#1.base|) 4 |ULTIMATE.start_sll_create_#res#1.base|) 0 0)) |ULTIMATE.start_sll_append_~new_last~0#1.base|) 0 0)))) (= |ULTIMATE.start_sll_append_~new_last~0#1.offset| 0) (<= (select |#length| |ULTIMATE.start_sll_append_~head#1.base|) 3) (<= 8 (select |#length| |ULTIMATE.start_node_create_with_sublist_#res#1.base|)) (= |ULTIMATE.start_main_~j~0#1| 0) (= |ULTIMATE.start_sll_append_#in~head#1.offset| 0) (= |ULTIMATE.start_node_create_with_sublist_#res#1.base| |ULTIMATE.start_sll_append_~new_last~0#1.base|))' at error location [2023-11-21 19:01:25,631 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-21 19:01:25,631 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-21 19:01:25,631 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 3, 5] total 10 [2023-11-21 19:01:25,631 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1887423650] [2023-11-21 19:01:25,631 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-21 19:01:25,632 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 12 states [2023-11-21 19:01:25,632 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-21 19:01:25,632 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 12 interpolants. [2023-11-21 19:01:25,633 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=69, Invalid=282, Unknown=3, NotChecked=108, Total=462 [2023-11-21 19:01:25,633 INFO L87 Difference]: Start difference. First operand 156 states and 200 transitions. Second operand has 12 states, 11 states have (on average 4.0) internal successors, (44), 11 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 19:01:25,914 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-21 19:01:25,914 INFO L93 Difference]: Finished difference Result 175 states and 213 transitions. [2023-11-21 19:01:25,915 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-11-21 19:01:25,915 INFO L78 Accepts]: Start accepts. Automaton has has 12 states, 11 states have (on average 4.0) internal successors, (44), 11 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2023-11-21 19:01:25,916 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-21 19:01:25,917 INFO L225 Difference]: With dead ends: 175 [2023-11-21 19:01:25,917 INFO L226 Difference]: Without dead ends: 175 [2023-11-21 19:01:25,917 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 67 GetRequests, 43 SyntacticMatches, 3 SemanticMatches, 21 ConstructedPredicates, 3 IntricatePredicates, 0 DeprecatedPredicates, 118 ImplicationChecksByTransitivity, 7.8s TimeCoverageRelationStatistics Valid=79, Invalid=310, Unknown=3, NotChecked=114, Total=506 [2023-11-21 19:01:25,918 INFO L413 NwaCegarLoop]: 32 mSDtfsCounter, 203 mSDsluCounter, 59 mSDsCounter, 0 mSdLazyCounter, 149 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 203 SdHoareTripleChecker+Valid, 91 SdHoareTripleChecker+Invalid, 481 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 149 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 324 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-21 19:01:25,918 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [203 Valid, 91 Invalid, 481 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 149 Invalid, 0 Unknown, 324 Unchecked, 0.2s Time] [2023-11-21 19:01:25,919 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 175 states. [2023-11-21 19:01:25,923 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 175 to 152. [2023-11-21 19:01:25,924 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 152 states, 126 states have (on average 1.492063492063492) internal successors, (188), 151 states have internal predecessors, (188), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 19:01:25,924 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 152 states to 152 states and 188 transitions. [2023-11-21 19:01:25,925 INFO L78 Accepts]: Start accepts. Automaton has 152 states and 188 transitions. Word has length 20 [2023-11-21 19:01:25,925 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-21 19:01:25,925 INFO L495 AbstractCegarLoop]: Abstraction has 152 states and 188 transitions. [2023-11-21 19:01:25,926 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 12 states, 11 states have (on average 4.0) internal successors, (44), 11 states have internal predecessors, (44), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 19:01:25,926 INFO L276 IsEmpty]: Start isEmpty. Operand 152 states and 188 transitions. [2023-11-21 19:01:25,927 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2023-11-21 19:01:25,928 INFO L187 NwaCegarLoop]: Found error trace [2023-11-21 19:01:25,928 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-21 19:01:25,954 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4ce69841-e1ef-4fae-8aa6-b6721e567e2e/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2023-11-21 19:01:26,147 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4ce69841-e1ef-4fae-8aa6-b6721e567e2e/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable15 [2023-11-21 19:01:26,148 INFO L420 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr10REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 39 more)] === [2023-11-21 19:01:26,148 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 19:01:26,148 INFO L85 PathProgramCache]: Analyzing trace with hash 625286978, now seen corresponding path program 1 times [2023-11-21 19:01:26,148 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-21 19:01:26,148 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [532706445] [2023-11-21 19:01:26,149 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:01:26,149 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 19:01:26,196 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 19:01:26,730 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 7 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2023-11-21 19:01:26,730 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-21 19:01:26,730 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [532706445] [2023-11-21 19:01:26,730 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [532706445] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-21 19:01:26,731 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [442371119] [2023-11-21 19:01:26,731 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:01:26,731 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 19:01:26,731 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4ce69841-e1ef-4fae-8aa6-b6721e567e2e/bin/utaipan-verify-QoSU8krkJ5/z3 [2023-11-21 19:01:26,732 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4ce69841-e1ef-4fae-8aa6-b6721e567e2e/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-21 19:01:26,733 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4ce69841-e1ef-4fae-8aa6-b6721e567e2e/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2023-11-21 19:01:26,870 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 19:01:26,873 INFO L262 TraceCheckSpWp]: Trace formula consists of 266 conjuncts, 50 conjunts are in the unsatisfiable core [2023-11-21 19:01:26,877 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-21 19:01:26,891 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2023-11-21 19:01:26,965 INFO L349 Elim1Store]: treesize reduction 18, result has 35.7 percent of original size [2023-11-21 19:01:26,965 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 17 treesize of output 21 [2023-11-21 19:01:27,072 INFO L349 Elim1Store]: treesize reduction 8, result has 52.9 percent of original size [2023-11-21 19:01:27,073 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 3 select indices, 3 select index equivalence classes, 1 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 2 case distinctions, treesize of input 16 treesize of output 18 [2023-11-21 19:01:27,136 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 11 [2023-11-21 19:01:27,145 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 3 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 11 [2023-11-21 19:01:27,253 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-21 19:01:27,254 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 11 [2023-11-21 19:01:27,266 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-21 19:01:27,273 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 11 [2023-11-21 19:01:27,386 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-21 19:01:27,387 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 11 [2023-11-21 19:01:27,392 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-21 19:01:27,394 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 11 [2023-11-21 19:01:27,438 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 11 [2023-11-21 19:01:27,445 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 11 [2023-11-21 19:01:27,459 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 11 [2023-11-21 19:01:27,465 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 11 [2023-11-21 19:01:27,494 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 11 [2023-11-21 19:01:27,497 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 11 [2023-11-21 19:01:27,525 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 11 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-21 19:01:27,525 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-21 19:01:27,539 WARN L854 $PredicateComparison]: unable to prove that (and (forall ((v_ArrVal_463 (Array Int Int))) (= (select (select (store |c_#memory_$Pointer$.base| |c_ULTIMATE.start_sll_append_~new_last~0#1.base| v_ArrVal_463) |c_ULTIMATE.start_sll_append_~head#1.base|) |c_ULTIMATE.start_sll_append_~head#1.offset|) 0)) (forall ((v_ArrVal_464 (Array Int Int))) (= (select (select (store |c_#memory_$Pointer$.offset| |c_ULTIMATE.start_sll_append_~new_last~0#1.base| v_ArrVal_464) |c_ULTIMATE.start_sll_append_~head#1.base|) |c_ULTIMATE.start_sll_append_~head#1.offset|) 0))) is different from false [2023-11-21 19:01:27,548 WARN L854 $PredicateComparison]: unable to prove that (and (forall ((v_ArrVal_464 (Array Int Int))) (= (select (select (store |c_#memory_$Pointer$.offset| |c_ULTIMATE.start_node_create_with_sublist_~new_node~0#1.base| v_ArrVal_464) |c_ULTIMATE.start_sll_append_~head#1.base|) |c_ULTIMATE.start_sll_append_~head#1.offset|) 0)) (forall ((v_ArrVal_463 (Array Int Int))) (= (select (select (store |c_#memory_$Pointer$.base| |c_ULTIMATE.start_node_create_with_sublist_~new_node~0#1.base| v_ArrVal_463) |c_ULTIMATE.start_sll_append_~head#1.base|) |c_ULTIMATE.start_sll_append_~head#1.offset|) 0))) is different from false [2023-11-21 19:01:31,652 WARN L854 $PredicateComparison]: unable to prove that (and (forall ((|v_ULTIMATE.start_sll_create_~new_head~0#1.base_56| Int)) (or (< |c_#StackHeapBarrier| (+ |v_ULTIMATE.start_sll_create_~new_head~0#1.base_56| 1)) (forall ((v_ArrVal_464 (Array Int Int)) (v_ArrVal_456 (Array Int Int))) (= (select (select (store (store |c_#memory_$Pointer$.offset| |v_ULTIMATE.start_sll_create_~new_head~0#1.base_56| v_ArrVal_456) |c_ULTIMATE.start_node_create_with_sublist_~new_node~0#1.base| v_ArrVal_464) |c_ULTIMATE.start_sll_append_~head#1.base|) |c_ULTIMATE.start_sll_append_~head#1.offset|) 0)))) (forall ((|v_ULTIMATE.start_sll_create_~new_head~0#1.base_56| Int)) (or (< |c_#StackHeapBarrier| (+ |v_ULTIMATE.start_sll_create_~new_head~0#1.base_56| 1)) (forall ((v_ArrVal_457 (Array Int Int)) (v_ArrVal_463 (Array Int Int))) (= (select (select (store (store |c_#memory_$Pointer$.base| |v_ULTIMATE.start_sll_create_~new_head~0#1.base_56| v_ArrVal_457) |c_ULTIMATE.start_node_create_with_sublist_~new_node~0#1.base| v_ArrVal_463) |c_ULTIMATE.start_sll_append_~head#1.base|) |c_ULTIMATE.start_sll_append_~head#1.offset|) 0))))) is different from false [2023-11-21 19:01:35,965 WARN L854 $PredicateComparison]: unable to prove that (and (forall ((|v_ULTIMATE.start_sll_create_~new_head~0#1.base_57| Int)) (or (< |c_#StackHeapBarrier| (+ |v_ULTIMATE.start_sll_create_~new_head~0#1.base_57| 1)) (forall ((|v_ULTIMATE.start_sll_create_~new_head~0#1.base_56| Int) (v_ArrVal_454 (Array Int Int))) (or (forall ((v_ArrVal_464 (Array Int Int)) (v_ArrVal_456 (Array Int Int))) (= (select (select (store (store (store |c_#memory_$Pointer$.offset| |v_ULTIMATE.start_sll_create_~new_head~0#1.base_57| v_ArrVal_454) |v_ULTIMATE.start_sll_create_~new_head~0#1.base_56| v_ArrVal_456) |c_ULTIMATE.start_node_create_with_sublist_~new_node~0#1.base| v_ArrVal_464) |c_ULTIMATE.start_sll_append_~head#1.base|) |c_ULTIMATE.start_sll_append_~head#1.offset|) 0)) (< |c_#StackHeapBarrier| (+ |v_ULTIMATE.start_sll_create_~new_head~0#1.base_56| 1)))))) (forall ((|v_ULTIMATE.start_sll_create_~new_head~0#1.base_57| Int)) (or (forall ((|v_ULTIMATE.start_sll_create_~new_head~0#1.base_56| Int) (v_ArrVal_455 (Array Int Int))) (or (forall ((v_ArrVal_457 (Array Int Int)) (v_ArrVal_463 (Array Int Int))) (= (select (select (store (store (store |c_#memory_$Pointer$.base| |v_ULTIMATE.start_sll_create_~new_head~0#1.base_57| v_ArrVal_455) |v_ULTIMATE.start_sll_create_~new_head~0#1.base_56| v_ArrVal_457) |c_ULTIMATE.start_node_create_with_sublist_~new_node~0#1.base| v_ArrVal_463) |c_ULTIMATE.start_sll_append_~head#1.base|) |c_ULTIMATE.start_sll_append_~head#1.offset|) 0)) (< |c_#StackHeapBarrier| (+ |v_ULTIMATE.start_sll_create_~new_head~0#1.base_56| 1)))) (< |c_#StackHeapBarrier| (+ |v_ULTIMATE.start_sll_create_~new_head~0#1.base_57| 1))))) is different from false [2023-11-21 19:01:38,012 WARN L854 $PredicateComparison]: unable to prove that (and (forall ((|v_ULTIMATE.start_sll_create_~new_head~0#1.base_57| Int) (v_ArrVal_452 (Array Int Int))) (or (< |c_#StackHeapBarrier| (+ |v_ULTIMATE.start_sll_create_~new_head~0#1.base_57| 1)) (forall ((|v_ULTIMATE.start_sll_create_~new_head~0#1.base_56| Int) (v_ArrVal_454 (Array Int Int))) (or (forall ((v_ArrVal_464 (Array Int Int)) (v_ArrVal_456 (Array Int Int))) (= (select (select (store (store (store (store |c_#memory_$Pointer$.offset| |c_ULTIMATE.start_sll_create_~new_head~0#1.base| v_ArrVal_452) |v_ULTIMATE.start_sll_create_~new_head~0#1.base_57| v_ArrVal_454) |v_ULTIMATE.start_sll_create_~new_head~0#1.base_56| v_ArrVal_456) |c_ULTIMATE.start_node_create_with_sublist_~new_node~0#1.base| v_ArrVal_464) |c_ULTIMATE.start_sll_append_~head#1.base|) |c_ULTIMATE.start_sll_append_~head#1.offset|) 0)) (< |c_#StackHeapBarrier| (+ |v_ULTIMATE.start_sll_create_~new_head~0#1.base_56| 1)))))) (forall ((|v_ULTIMATE.start_sll_create_~new_head~0#1.base_57| Int) (v_ArrVal_453 (Array Int Int))) (or (forall ((|v_ULTIMATE.start_sll_create_~new_head~0#1.base_56| Int) (v_ArrVal_455 (Array Int Int))) (or (< |c_#StackHeapBarrier| (+ |v_ULTIMATE.start_sll_create_~new_head~0#1.base_56| 1)) (forall ((v_ArrVal_457 (Array Int Int)) (v_ArrVal_463 (Array Int Int))) (= (select (select (store (store (store (store |c_#memory_$Pointer$.base| |c_ULTIMATE.start_sll_create_~new_head~0#1.base| v_ArrVal_453) |v_ULTIMATE.start_sll_create_~new_head~0#1.base_57| v_ArrVal_455) |v_ULTIMATE.start_sll_create_~new_head~0#1.base_56| v_ArrVal_457) |c_ULTIMATE.start_node_create_with_sublist_~new_node~0#1.base| v_ArrVal_463) |c_ULTIMATE.start_sll_append_~head#1.base|) |c_ULTIMATE.start_sll_append_~head#1.offset|) 0)))) (< |c_#StackHeapBarrier| (+ |v_ULTIMATE.start_sll_create_~new_head~0#1.base_57| 1))))) is different from false [2023-11-21 19:01:38,879 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 10 not checked. [2023-11-21 19:01:38,879 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [442371119] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-21 19:01:38,879 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1012099194] [2023-11-21 19:01:38,883 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-11-21 19:01:38,883 INFO L166 IcfgInterpreter]: Building call graph [2023-11-21 19:01:38,884 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-21 19:01:38,885 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-21 19:01:38,885 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-21 19:01:39,775 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-21 19:01:43,177 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '5646#(and (= (select (select |#memory_$Pointer$.base| |ULTIMATE.start_sll_append_~head#1.base|) 0) |ULTIMATE.start_sll_append_~temp~0#1.base|) (<= 1 |#StackHeapBarrier|) (not (= (select |#valid| |ULTIMATE.start_sll_append_~temp~0#1.base|) 1)) (= |ULTIMATE.start_sll_append_~temp~0#1.offset| (select (select |#memory_$Pointer$.offset| |ULTIMATE.start_sll_append_~head#1.base|) 0)) (= 3 |ULTIMATE.start_sll_append_#in~sublist_length#1|) (= |ULTIMATE.start_node_create_with_sublist_#res#1.offset| 0) (= |ULTIMATE.start_sll_append_~sublist_length#1| 3) (= 3 |ULTIMATE.start_main_~i~0#1|) (= 5 |ULTIMATE.start_main_~max~0#1|) (<= 2 |ULTIMATE.start_sll_append_#in~head#1.base|) (exists ((|v_#memory_$Pointer$.offset_102| (Array Int (Array Int Int)))) (= |#memory_$Pointer$.offset| (store (store |v_#memory_$Pointer$.offset_102| |ULTIMATE.start_node_create_with_sublist_#res#1.base| (store (store (select |v_#memory_$Pointer$.offset_102| |ULTIMATE.start_node_create_with_sublist_#res#1.base|) 4 0) 0 0)) |ULTIMATE.start_sll_append_~new_last~0#1.base| (store (select (store |v_#memory_$Pointer$.offset_102| |ULTIMATE.start_node_create_with_sublist_#res#1.base| (store (store (select |v_#memory_$Pointer$.offset_102| |ULTIMATE.start_node_create_with_sublist_#res#1.base|) 4 0) 0 0)) |ULTIMATE.start_sll_append_~new_last~0#1.base|) 0 0)))) (= |ULTIMATE.start_main_~#head~1#1.offset| 0) (or (not (= |ULTIMATE.start_sll_append_~temp~0#1.base| 0)) (not (= |ULTIMATE.start_sll_append_~temp~0#1.offset| 0))) (= |ULTIMATE.start_sll_append_~head#1.offset| 0) (exists ((|v_#memory_int_65| (Array Int (Array Int Int))) (|v_#memory_int_66| (Array Int (Array Int Int))) (|v_#memory_int_67| (Array Int (Array Int Int)))) (and (= (store |v_#memory_int_66| |ULTIMATE.start_node_create_with_sublist_#res#1.base| (store (select |v_#memory_int_66| |ULTIMATE.start_node_create_with_sublist_#res#1.base|) 0 (select (select |v_#memory_int_67| |ULTIMATE.start_node_create_with_sublist_#res#1.base|) 0))) |v_#memory_int_67|) (= (store |v_#memory_int_65| |ULTIMATE.start_node_create_with_sublist_#res#1.base| (store (select |v_#memory_int_65| |ULTIMATE.start_node_create_with_sublist_#res#1.base|) 4 (select (select |v_#memory_int_66| |ULTIMATE.start_node_create_with_sublist_#res#1.base|) 4))) |v_#memory_int_66|) (= (store |v_#memory_int_67| |ULTIMATE.start_sll_append_~new_last~0#1.base| (store (select |v_#memory_int_67| |ULTIMATE.start_sll_append_~new_last~0#1.base|) 0 (select (select |#memory_int| |ULTIMATE.start_sll_append_~new_last~0#1.base|) 0))) |#memory_int|))) (= |ULTIMATE.start_sll_create_#res#1.offset| 0) (<= 4 (select |#length| |ULTIMATE.start_sll_append_~head#1.base|)) (= 3 |ULTIMATE.start_main_~min~0#1|) (= (select |#valid| |ULTIMATE.start_node_create_with_sublist_#res#1.base|) 1) (<= 2 |ULTIMATE.start_sll_append_~head#1.base|) (<= 2 |ULTIMATE.start_main_~#head~1#1.base|) (exists ((|v_#memory_$Pointer$.base_102| (Array Int (Array Int Int)))) (= |#memory_$Pointer$.base| (store (store |v_#memory_$Pointer$.base_102| |ULTIMATE.start_node_create_with_sublist_#res#1.base| (store (store (select |v_#memory_$Pointer$.base_102| |ULTIMATE.start_node_create_with_sublist_#res#1.base|) 4 |ULTIMATE.start_sll_create_#res#1.base|) 0 0)) |ULTIMATE.start_sll_append_~new_last~0#1.base| (store (select (store |v_#memory_$Pointer$.base_102| |ULTIMATE.start_node_create_with_sublist_#res#1.base| (store (store (select |v_#memory_$Pointer$.base_102| |ULTIMATE.start_node_create_with_sublist_#res#1.base|) 4 |ULTIMATE.start_sll_create_#res#1.base|) 0 0)) |ULTIMATE.start_sll_append_~new_last~0#1.base|) 0 0)))) (= |ULTIMATE.start_sll_append_~new_last~0#1.offset| 0) (<= 8 (select |#length| |ULTIMATE.start_node_create_with_sublist_#res#1.base|)) (= |ULTIMATE.start_main_~j~0#1| 0) (= |ULTIMATE.start_sll_append_#in~head#1.offset| 0) (= (select |#valid| |ULTIMATE.start_sll_append_~head#1.base|) 1) (= |ULTIMATE.start_node_create_with_sublist_#res#1.base| |ULTIMATE.start_sll_append_~new_last~0#1.base|))' at error location [2023-11-21 19:01:43,177 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-21 19:01:43,177 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-21 19:01:43,178 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 11, 12] total 27 [2023-11-21 19:01:43,178 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1056666847] [2023-11-21 19:01:43,178 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-21 19:01:43,178 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 28 states [2023-11-21 19:01:43,179 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-21 19:01:43,179 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 28 interpolants. [2023-11-21 19:01:43,180 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=169, Invalid=1018, Unknown=23, NotChecked=350, Total=1560 [2023-11-21 19:01:43,181 INFO L87 Difference]: Start difference. First operand 152 states and 188 transitions. Second operand has 28 states, 28 states have (on average 2.0714285714285716) internal successors, (58), 27 states have internal predecessors, (58), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 19:01:44,702 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-21 19:01:44,702 INFO L93 Difference]: Finished difference Result 209 states and 248 transitions. [2023-11-21 19:01:44,703 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2023-11-21 19:01:44,704 INFO L78 Accepts]: Start accepts. Automaton has has 28 states, 28 states have (on average 2.0714285714285716) internal successors, (58), 27 states have internal predecessors, (58), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 22 [2023-11-21 19:01:44,704 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-21 19:01:44,707 INFO L225 Difference]: With dead ends: 209 [2023-11-21 19:01:44,707 INFO L226 Difference]: Without dead ends: 209 [2023-11-21 19:01:44,708 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 84 GetRequests, 38 SyntacticMatches, 5 SemanticMatches, 41 ConstructedPredicates, 5 IntricatePredicates, 0 DeprecatedPredicates, 558 ImplicationChecksByTransitivity, 14.8s TimeCoverageRelationStatistics Valid=211, Invalid=1192, Unknown=23, NotChecked=380, Total=1806 [2023-11-21 19:01:44,709 INFO L413 NwaCegarLoop]: 57 mSDtfsCounter, 30 mSDsluCounter, 777 mSDsCounter, 0 mSdLazyCounter, 398 mSolverCounterSat, 19 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.9s Time, 0 mProtectedPredicate, 0 mProtectedAction, 30 SdHoareTripleChecker+Valid, 834 SdHoareTripleChecker+Invalid, 660 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 19 IncrementalHoareTripleChecker+Valid, 398 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 243 IncrementalHoareTripleChecker+Unchecked, 1.0s IncrementalHoareTripleChecker+Time [2023-11-21 19:01:44,710 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [30 Valid, 834 Invalid, 660 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [19 Valid, 398 Invalid, 0 Unknown, 243 Unchecked, 1.0s Time] [2023-11-21 19:01:44,711 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 209 states. [2023-11-21 19:01:44,716 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 209 to 203. [2023-11-21 19:01:44,717 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 203 states, 177 states have (on average 1.3672316384180792) internal successors, (242), 202 states have internal predecessors, (242), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 19:01:44,718 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 203 states to 203 states and 242 transitions. [2023-11-21 19:01:44,718 INFO L78 Accepts]: Start accepts. Automaton has 203 states and 242 transitions. Word has length 22 [2023-11-21 19:01:44,718 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-21 19:01:44,718 INFO L495 AbstractCegarLoop]: Abstraction has 203 states and 242 transitions. [2023-11-21 19:01:44,719 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 28 states, 28 states have (on average 2.0714285714285716) internal successors, (58), 27 states have internal predecessors, (58), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 19:01:44,719 INFO L276 IsEmpty]: Start isEmpty. Operand 203 states and 242 transitions. [2023-11-21 19:01:44,720 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2023-11-21 19:01:44,720 INFO L187 NwaCegarLoop]: Found error trace [2023-11-21 19:01:44,720 INFO L195 NwaCegarLoop]: trace histogram [4, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-21 19:01:44,749 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4ce69841-e1ef-4fae-8aa6-b6721e567e2e/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2023-11-21 19:01:44,941 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4ce69841-e1ef-4fae-8aa6-b6721e567e2e/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable16 [2023-11-21 19:01:44,942 INFO L420 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr20REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 39 more)] === [2023-11-21 19:01:44,942 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 19:01:44,942 INFO L85 PathProgramCache]: Analyzing trace with hash 2116570961, now seen corresponding path program 1 times [2023-11-21 19:01:44,943 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-21 19:01:44,943 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [620587975] [2023-11-21 19:01:44,943 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:01:44,943 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 19:01:44,969 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 19:01:45,282 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 11 proven. 0 refuted. 0 times theorem prover too weak. 22 trivial. 0 not checked. [2023-11-21 19:01:45,282 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-21 19:01:45,282 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [620587975] [2023-11-21 19:01:45,282 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [620587975] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-21 19:01:45,282 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-21 19:01:45,282 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2023-11-21 19:01:45,283 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [74118156] [2023-11-21 19:01:45,283 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-21 19:01:45,283 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-11-21 19:01:45,283 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-21 19:01:45,284 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-11-21 19:01:45,284 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2023-11-21 19:01:45,284 INFO L87 Difference]: Start difference. First operand 203 states and 242 transitions. Second operand has 7 states, 6 states have (on average 4.666666666666667) internal successors, (28), 7 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 19:01:45,893 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-21 19:01:45,893 INFO L93 Difference]: Finished difference Result 346 states and 405 transitions. [2023-11-21 19:01:45,893 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2023-11-21 19:01:45,894 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 6 states have (on average 4.666666666666667) internal successors, (28), 7 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 40 [2023-11-21 19:01:45,894 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-21 19:01:45,896 INFO L225 Difference]: With dead ends: 346 [2023-11-21 19:01:45,896 INFO L226 Difference]: Without dead ends: 346 [2023-11-21 19:01:45,897 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 9 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 9 ImplicationChecksByTransitivity, 0.2s TimeCoverageRelationStatistics Valid=27, Invalid=63, Unknown=0, NotChecked=0, Total=90 [2023-11-21 19:01:45,897 INFO L413 NwaCegarLoop]: 46 mSDtfsCounter, 188 mSDsluCounter, 188 mSDsCounter, 0 mSdLazyCounter, 249 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 188 SdHoareTripleChecker+Valid, 234 SdHoareTripleChecker+Invalid, 257 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 249 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.5s IncrementalHoareTripleChecker+Time [2023-11-21 19:01:45,898 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [188 Valid, 234 Invalid, 257 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 249 Invalid, 0 Unknown, 0 Unchecked, 0.5s Time] [2023-11-21 19:01:45,899 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 346 states. [2023-11-21 19:01:45,907 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 346 to 222. [2023-11-21 19:01:45,908 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 222 states, 197 states have (on average 1.365482233502538) internal successors, (269), 221 states have internal predecessors, (269), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 19:01:45,909 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 222 states to 222 states and 269 transitions. [2023-11-21 19:01:45,909 INFO L78 Accepts]: Start accepts. Automaton has 222 states and 269 transitions. Word has length 40 [2023-11-21 19:01:45,909 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-21 19:01:45,910 INFO L495 AbstractCegarLoop]: Abstraction has 222 states and 269 transitions. [2023-11-21 19:01:45,910 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 6 states have (on average 4.666666666666667) internal successors, (28), 7 states have internal predecessors, (28), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-21 19:01:45,910 INFO L276 IsEmpty]: Start isEmpty. Operand 222 states and 269 transitions. [2023-11-21 19:01:45,911 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 41 [2023-11-21 19:01:45,911 INFO L187 NwaCegarLoop]: Found error trace [2023-11-21 19:01:45,911 INFO L195 NwaCegarLoop]: trace histogram [4, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-21 19:01:45,911 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable17 [2023-11-21 19:01:45,912 INFO L420 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr21REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 39 more)] === [2023-11-21 19:01:45,912 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-21 19:01:45,912 INFO L85 PathProgramCache]: Analyzing trace with hash 2116570962, now seen corresponding path program 1 times [2023-11-21 19:01:45,913 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-21 19:01:45,913 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [799553101] [2023-11-21 19:01:45,913 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:01:45,913 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-21 19:01:45,941 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 19:01:46,266 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 14 proven. 19 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-21 19:01:46,267 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-21 19:01:46,267 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [799553101] [2023-11-21 19:01:46,267 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [799553101] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-21 19:01:46,267 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1812798785] [2023-11-21 19:01:46,267 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-21 19:01:46,267 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-21 19:01:46,268 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4ce69841-e1ef-4fae-8aa6-b6721e567e2e/bin/utaipan-verify-QoSU8krkJ5/z3 [2023-11-21 19:01:46,269 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4ce69841-e1ef-4fae-8aa6-b6721e567e2e/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-21 19:01:46,276 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_4ce69841-e1ef-4fae-8aa6-b6721e567e2e/bin/utaipan-verify-QoSU8krkJ5/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2023-11-21 19:01:46,439 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-21 19:01:46,441 INFO L262 TraceCheckSpWp]: Trace formula consists of 322 conjuncts, 14 conjunts are in the unsatisfiable core [2023-11-21 19:01:46,443 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-21 19:01:46,584 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 21 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-21 19:01:46,584 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-21 19:01:46,785 INFO L134 CoverageAnalysis]: Checked inductivity of 33 backedges. 21 proven. 12 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-21 19:01:46,785 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1812798785] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-21 19:01:46,786 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [568331161] [2023-11-21 19:01:46,788 INFO L159 IcfgInterpreter]: Started Sifa with 23 locations of interest [2023-11-21 19:01:46,789 INFO L166 IcfgInterpreter]: Building call graph [2023-11-21 19:01:46,789 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-21 19:01:46,790 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-21 19:01:46,790 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs