./Ultimate.py --spec ../../sv-benchmarks/c/properties/valid-memsafety.prp --file ../../sv-benchmarks/c/list-simple/dll2n_append_equal.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for memory safety (deref-memtrack) Using default analysis Version 9bd2c7ff Calling Ultimate with: /usr/lib/jvm/java-1.11.0-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9ae95ef-3e5d-42cc-86a9-521edaf3958d/bin/utaipan-verify-t7M7D8N6sZ/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9ae95ef-3e5d-42cc-86a9-521edaf3958d/bin/utaipan-verify-t7M7D8N6sZ/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9ae95ef-3e5d-42cc-86a9-521edaf3958d/bin/utaipan-verify-t7M7D8N6sZ/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9ae95ef-3e5d-42cc-86a9-521edaf3958d/bin/utaipan-verify-t7M7D8N6sZ/config/TaipanMemDerefMemtrack.xml -i ../../sv-benchmarks/c/list-simple/dll2n_append_equal.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9ae95ef-3e5d-42cc-86a9-521edaf3958d/bin/utaipan-verify-t7M7D8N6sZ/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9ae95ef-3e5d-42cc-86a9-521edaf3958d/bin/utaipan-verify-t7M7D8N6sZ --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 3a59620f668b7c0725f940bc66e10441fbb56ee9b9fb687de4bd19a3f12eaeda --- Real Ultimate output --- This is Ultimate 0.2.3-dev-9bd2c7f [2023-11-19 05:08:26,191 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-11-19 05:08:26,306 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9ae95ef-3e5d-42cc-86a9-521edaf3958d/bin/utaipan-verify-t7M7D8N6sZ/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Default.epf [2023-11-19 05:08:26,314 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-11-19 05:08:26,315 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-11-19 05:08:26,355 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-11-19 05:08:26,355 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-11-19 05:08:26,356 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-11-19 05:08:26,357 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-11-19 05:08:26,362 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-11-19 05:08:26,363 INFO L153 SettingsManager]: * User list type=DISABLED [2023-11-19 05:08:26,364 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-11-19 05:08:26,364 INFO L153 SettingsManager]: * Explicit value domain=true [2023-11-19 05:08:26,366 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-11-19 05:08:26,367 INFO L153 SettingsManager]: * Octagon Domain=false [2023-11-19 05:08:26,367 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-11-19 05:08:26,368 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-11-19 05:08:26,368 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-11-19 05:08:26,369 INFO L153 SettingsManager]: * Interval Domain=false [2023-11-19 05:08:26,369 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-11-19 05:08:26,370 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-11-19 05:08:26,370 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2023-11-19 05:08:26,371 INFO L151 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2023-11-19 05:08:26,371 INFO L153 SettingsManager]: * Create parallel compositions if possible=false [2023-11-19 05:08:26,372 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-11-19 05:08:26,373 INFO L153 SettingsManager]: * sizeof long=4 [2023-11-19 05:08:26,373 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-11-19 05:08:26,374 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-11-19 05:08:26,374 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-11-19 05:08:26,375 INFO L153 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2023-11-19 05:08:26,376 INFO L153 SettingsManager]: * Bitprecise bitfields=true [2023-11-19 05:08:26,376 INFO L153 SettingsManager]: * SV-COMP memtrack compatibility mode=true [2023-11-19 05:08:26,377 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-11-19 05:08:26,377 INFO L153 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2023-11-19 05:08:26,377 INFO L153 SettingsManager]: * Check unreachability of reach_error function=false [2023-11-19 05:08:26,377 INFO L153 SettingsManager]: * sizeof long double=12 [2023-11-19 05:08:26,377 INFO L153 SettingsManager]: * Use constant arrays=true [2023-11-19 05:08:26,378 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-11-19 05:08:26,378 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-11-19 05:08:26,378 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-19 05:08:26,378 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-11-19 05:08:26,379 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-11-19 05:08:26,379 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-11-19 05:08:26,379 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-11-19 05:08:26,380 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-11-19 05:08:26,380 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-11-19 05:08:26,380 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_d9ae95ef-3e5d-42cc-86a9-521edaf3958d/bin/utaipan-verify-t7M7D8N6sZ/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9ae95ef-3e5d-42cc-86a9-521edaf3958d/bin/utaipan-verify-t7M7D8N6sZ Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 3a59620f668b7c0725f940bc66e10441fbb56ee9b9fb687de4bd19a3f12eaeda [2023-11-19 05:08:26,682 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-11-19 05:08:26,715 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-11-19 05:08:26,718 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-11-19 05:08:26,719 INFO L270 PluginConnector]: Initializing CDTParser... [2023-11-19 05:08:26,719 INFO L274 PluginConnector]: CDTParser initialized [2023-11-19 05:08:26,720 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9ae95ef-3e5d-42cc-86a9-521edaf3958d/bin/utaipan-verify-t7M7D8N6sZ/../../sv-benchmarks/c/list-simple/dll2n_append_equal.i [2023-11-19 05:08:29,806 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-11-19 05:08:30,137 INFO L384 CDTParser]: Found 1 translation units. [2023-11-19 05:08:30,139 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9ae95ef-3e5d-42cc-86a9-521edaf3958d/sv-benchmarks/c/list-simple/dll2n_append_equal.i [2023-11-19 05:08:30,156 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9ae95ef-3e5d-42cc-86a9-521edaf3958d/bin/utaipan-verify-t7M7D8N6sZ/data/fbd00cbda/0473f5242da64ccf86b19c2ab329541a/FLAG9eb42409a [2023-11-19 05:08:30,171 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9ae95ef-3e5d-42cc-86a9-521edaf3958d/bin/utaipan-verify-t7M7D8N6sZ/data/fbd00cbda/0473f5242da64ccf86b19c2ab329541a [2023-11-19 05:08:30,173 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-11-19 05:08:30,175 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-11-19 05:08:30,176 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-11-19 05:08:30,177 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-11-19 05:08:30,182 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-11-19 05:08:30,183 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.11 05:08:30" (1/1) ... [2023-11-19 05:08:30,184 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@3fdcf959 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:08:30, skipping insertion in model container [2023-11-19 05:08:30,185 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 19.11 05:08:30" (1/1) ... [2023-11-19 05:08:30,227 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-11-19 05:08:30,542 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-19 05:08:30,554 INFO L202 MainTranslator]: Completed pre-run [2023-11-19 05:08:30,631 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-19 05:08:30,673 INFO L206 MainTranslator]: Completed translation [2023-11-19 05:08:30,674 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:08:30 WrapperNode [2023-11-19 05:08:30,674 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-11-19 05:08:30,675 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-11-19 05:08:30,675 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-11-19 05:08:30,675 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-11-19 05:08:30,683 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:08:30" (1/1) ... [2023-11-19 05:08:30,717 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:08:30" (1/1) ... [2023-11-19 05:08:30,756 INFO L138 Inliner]: procedures = 127, calls = 38, calls flagged for inlining = 7, calls inlined = 7, statements flattened = 130 [2023-11-19 05:08:30,756 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-11-19 05:08:30,757 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-11-19 05:08:30,757 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-11-19 05:08:30,757 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-11-19 05:08:30,767 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:08:30" (1/1) ... [2023-11-19 05:08:30,768 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:08:30" (1/1) ... [2023-11-19 05:08:30,787 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:08:30" (1/1) ... [2023-11-19 05:08:30,787 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:08:30" (1/1) ... [2023-11-19 05:08:30,795 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:08:30" (1/1) ... [2023-11-19 05:08:30,798 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:08:30" (1/1) ... [2023-11-19 05:08:30,815 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:08:30" (1/1) ... [2023-11-19 05:08:30,818 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:08:30" (1/1) ... [2023-11-19 05:08:30,827 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-11-19 05:08:30,828 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-11-19 05:08:30,828 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-11-19 05:08:30,828 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-11-19 05:08:30,829 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:08:30" (1/1) ... [2023-11-19 05:08:30,841 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-19 05:08:30,856 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9ae95ef-3e5d-42cc-86a9-521edaf3958d/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 05:08:30,868 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9ae95ef-3e5d-42cc-86a9-521edaf3958d/bin/utaipan-verify-t7M7D8N6sZ/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-11-19 05:08:30,910 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9ae95ef-3e5d-42cc-86a9-521edaf3958d/bin/utaipan-verify-t7M7D8N6sZ/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-11-19 05:08:30,918 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-11-19 05:08:30,919 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-11-19 05:08:30,919 INFO L130 BoogieDeclarations]: Found specification of procedure node_create [2023-11-19 05:08:30,919 INFO L138 BoogieDeclarations]: Found implementation of procedure node_create [2023-11-19 05:08:30,919 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2023-11-19 05:08:30,919 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-11-19 05:08:30,920 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2023-11-19 05:08:30,920 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2023-11-19 05:08:30,922 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2023-11-19 05:08:30,922 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-11-19 05:08:30,923 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~$Pointer$ [2023-11-19 05:08:30,923 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-11-19 05:08:30,923 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-11-19 05:08:30,923 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-11-19 05:08:31,077 INFO L236 CfgBuilder]: Building ICFG [2023-11-19 05:08:31,080 INFO L262 CfgBuilder]: Building CFG for each procedure with an implementation [2023-11-19 05:08:31,516 INFO L277 CfgBuilder]: Performing block encoding [2023-11-19 05:08:31,614 INFO L297 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-11-19 05:08:31,614 INFO L302 CfgBuilder]: Removed 4 assume(true) statements. [2023-11-19 05:08:31,620 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.11 05:08:31 BoogieIcfgContainer [2023-11-19 05:08:31,620 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-11-19 05:08:31,623 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-11-19 05:08:31,623 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-11-19 05:08:31,627 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-11-19 05:08:31,627 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 19.11 05:08:30" (1/3) ... [2023-11-19 05:08:31,642 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@288a5807 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.11 05:08:31, skipping insertion in model container [2023-11-19 05:08:31,642 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 19.11 05:08:30" (2/3) ... [2023-11-19 05:08:31,642 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@288a5807 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 19.11 05:08:31, skipping insertion in model container [2023-11-19 05:08:31,643 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 19.11 05:08:31" (3/3) ... [2023-11-19 05:08:31,644 INFO L112 eAbstractionObserver]: Analyzing ICFG dll2n_append_equal.i [2023-11-19 05:08:31,666 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-11-19 05:08:31,666 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 41 error locations. [2023-11-19 05:08:31,728 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-11-19 05:08:31,736 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;@56d1620, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-11-19 05:08:31,736 INFO L358 AbstractCegarLoop]: Starting to check reachability of 41 error locations. [2023-11-19 05:08:31,741 INFO L276 IsEmpty]: Start isEmpty. Operand has 87 states, 42 states have (on average 2.238095238095238) internal successors, (94), 83 states have internal predecessors, (94), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-11-19 05:08:31,749 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2023-11-19 05:08:31,749 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:08:31,750 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2023-11-19 05:08:31,752 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting node_createErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 38 more)] === [2023-11-19 05:08:31,760 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:08:31,760 INFO L85 PathProgramCache]: Analyzing trace with hash -2136453069, now seen corresponding path program 1 times [2023-11-19 05:08:31,772 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:08:31,772 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1003700362] [2023-11-19 05:08:31,772 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:08:31,773 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:08:31,919 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:08:32,132 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 05:08:32,133 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:08:32,133 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1003700362] [2023-11-19 05:08:32,134 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1003700362] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-19 05:08:32,134 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-19 05:08:32,134 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-11-19 05:08:32,136 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [103320422] [2023-11-19 05:08:32,137 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 05:08:32,141 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-19 05:08:32,142 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:08:32,192 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-19 05:08:32,193 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-19 05:08:32,196 INFO L87 Difference]: Start difference. First operand has 87 states, 42 states have (on average 2.238095238095238) internal successors, (94), 83 states have internal predecessors, (94), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Second operand has 3 states, 3 states have (on average 1.6666666666666667) internal successors, (5), 2 states have internal predecessors, (5), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 05:08:32,291 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:08:32,292 INFO L93 Difference]: Finished difference Result 100 states and 110 transitions. [2023-11-19 05:08:32,293 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-19 05:08:32,294 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 1.6666666666666667) internal successors, (5), 2 states have internal predecessors, (5), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 6 [2023-11-19 05:08:32,294 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:08:32,303 INFO L225 Difference]: With dead ends: 100 [2023-11-19 05:08:32,303 INFO L226 Difference]: Without dead ends: 98 [2023-11-19 05:08:32,305 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 [2023-11-19 05:08:32,311 INFO L413 NwaCegarLoop]: 79 mSDtfsCounter, 13 mSDsluCounter, 79 mSDsCounter, 0 mSdLazyCounter, 29 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 14 SdHoareTripleChecker+Valid, 158 SdHoareTripleChecker+Invalid, 29 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 29 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-19 05:08:32,312 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [14 Valid, 158 Invalid, 29 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 29 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-19 05:08:32,330 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 98 states. [2023-11-19 05:08:32,353 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 98 to 85. [2023-11-19 05:08:32,355 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 85 states, 41 states have (on average 2.1463414634146343) internal successors, (88), 81 states have internal predecessors, (88), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-11-19 05:08:32,358 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 85 states to 85 states and 92 transitions. [2023-11-19 05:08:32,359 INFO L78 Accepts]: Start accepts. Automaton has 85 states and 92 transitions. Word has length 6 [2023-11-19 05:08:32,359 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:08:32,359 INFO L495 AbstractCegarLoop]: Abstraction has 85 states and 92 transitions. [2023-11-19 05:08:32,360 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 1.6666666666666667) internal successors, (5), 2 states have internal predecessors, (5), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 05:08:32,360 INFO L276 IsEmpty]: Start isEmpty. Operand 85 states and 92 transitions. [2023-11-19 05:08:32,360 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2023-11-19 05:08:32,360 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:08:32,360 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2023-11-19 05:08:32,360 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-11-19 05:08:32,364 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting node_createErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 38 more)] === [2023-11-19 05:08:32,366 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:08:32,366 INFO L85 PathProgramCache]: Analyzing trace with hash 1990373823, now seen corresponding path program 1 times [2023-11-19 05:08:32,367 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:08:32,367 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [206303016] [2023-11-19 05:08:32,368 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:08:32,368 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:08:32,381 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:08:32,430 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 05:08:32,430 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:08:32,430 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [206303016] [2023-11-19 05:08:32,431 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [206303016] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-19 05:08:32,431 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-19 05:08:32,431 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-11-19 05:08:32,431 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1126462613] [2023-11-19 05:08:32,431 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 05:08:32,432 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-19 05:08:32,433 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:08:32,433 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-19 05:08:32,434 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-19 05:08:32,434 INFO L87 Difference]: Start difference. First operand 85 states and 92 transitions. Second operand has 3 states, 2 states have (on average 2.5) internal successors, (5), 3 states have internal predecessors, (5), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 05:08:32,522 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:08:32,522 INFO L93 Difference]: Finished difference Result 82 states and 89 transitions. [2023-11-19 05:08:32,522 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-19 05:08:32,523 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 2.5) internal successors, (5), 3 states have internal predecessors, (5), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 6 [2023-11-19 05:08:32,523 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:08:32,524 INFO L225 Difference]: With dead ends: 82 [2023-11-19 05:08:32,524 INFO L226 Difference]: Without dead ends: 82 [2023-11-19 05:08:32,525 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 [2023-11-19 05:08:32,526 INFO L413 NwaCegarLoop]: 70 mSDtfsCounter, 6 mSDsluCounter, 41 mSDsCounter, 0 mSdLazyCounter, 57 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 111 SdHoareTripleChecker+Invalid, 59 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 57 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-19 05:08:32,527 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [6 Valid, 111 Invalid, 59 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 57 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-19 05:08:32,528 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2023-11-19 05:08:32,534 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 82. [2023-11-19 05:08:32,534 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 82 states, 41 states have (on average 2.073170731707317) internal successors, (85), 78 states have internal predecessors, (85), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-11-19 05:08:32,536 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 89 transitions. [2023-11-19 05:08:32,537 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 89 transitions. Word has length 6 [2023-11-19 05:08:32,537 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:08:32,537 INFO L495 AbstractCegarLoop]: Abstraction has 82 states and 89 transitions. [2023-11-19 05:08:32,537 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 2.5) internal successors, (5), 3 states have internal predecessors, (5), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 05:08:32,537 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 89 transitions. [2023-11-19 05:08:32,538 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 7 [2023-11-19 05:08:32,538 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:08:32,538 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1] [2023-11-19 05:08:32,538 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2023-11-19 05:08:32,539 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting node_createErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 38 more)] === [2023-11-19 05:08:32,539 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:08:32,539 INFO L85 PathProgramCache]: Analyzing trace with hash 1990373824, now seen corresponding path program 1 times [2023-11-19 05:08:32,539 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:08:32,540 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [660053125] [2023-11-19 05:08:32,540 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:08:32,540 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:08:32,555 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:08:32,657 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 05:08:32,657 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:08:32,657 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [660053125] [2023-11-19 05:08:32,658 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [660053125] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-19 05:08:32,658 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-19 05:08:32,658 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-11-19 05:08:32,658 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [439792250] [2023-11-19 05:08:32,659 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 05:08:32,659 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-19 05:08:32,659 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:08:32,660 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-19 05:08:32,660 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-19 05:08:32,661 INFO L87 Difference]: Start difference. First operand 82 states and 89 transitions. Second operand has 3 states, 2 states have (on average 2.5) internal successors, (5), 3 states have internal predecessors, (5), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 05:08:32,760 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:08:32,760 INFO L93 Difference]: Finished difference Result 79 states and 86 transitions. [2023-11-19 05:08:32,764 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-19 05:08:32,765 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 2.5) internal successors, (5), 3 states have internal predecessors, (5), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 6 [2023-11-19 05:08:32,765 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:08:32,766 INFO L225 Difference]: With dead ends: 79 [2023-11-19 05:08:32,766 INFO L226 Difference]: Without dead ends: 79 [2023-11-19 05:08:32,767 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 [2023-11-19 05:08:32,768 INFO L413 NwaCegarLoop]: 70 mSDtfsCounter, 3 mSDsluCounter, 44 mSDsCounter, 0 mSdLazyCounter, 51 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 114 SdHoareTripleChecker+Invalid, 53 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 51 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-19 05:08:32,769 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [3 Valid, 114 Invalid, 53 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 51 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-19 05:08:32,770 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 79 states. [2023-11-19 05:08:32,776 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 79 to 79. [2023-11-19 05:08:32,776 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 79 states, 41 states have (on average 2.0) internal successors, (82), 75 states have internal predecessors, (82), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-11-19 05:08:32,778 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 79 states to 79 states and 86 transitions. [2023-11-19 05:08:32,778 INFO L78 Accepts]: Start accepts. Automaton has 79 states and 86 transitions. Word has length 6 [2023-11-19 05:08:32,778 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:08:32,778 INFO L495 AbstractCegarLoop]: Abstraction has 79 states and 86 transitions. [2023-11-19 05:08:32,779 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 2.5) internal successors, (5), 3 states have internal predecessors, (5), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-19 05:08:32,779 INFO L276 IsEmpty]: Start isEmpty. Operand 79 states and 86 transitions. [2023-11-19 05:08:32,779 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2023-11-19 05:08:32,780 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:08:32,780 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 05:08:32,780 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2023-11-19 05:08:32,780 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 38 more)] === [2023-11-19 05:08:32,785 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:08:32,785 INFO L85 PathProgramCache]: Analyzing trace with hash -1239076541, now seen corresponding path program 1 times [2023-11-19 05:08:32,785 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:08:32,785 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [198497885] [2023-11-19 05:08:32,786 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:08:32,786 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:08:32,820 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:08:33,091 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 05:08:33,091 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:08:33,091 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [198497885] [2023-11-19 05:08:33,092 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [198497885] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-19 05:08:33,092 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-19 05:08:33,092 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2023-11-19 05:08:33,092 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1274285992] [2023-11-19 05:08:33,093 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 05:08:33,093 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-11-19 05:08:33,093 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:08:33,094 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-11-19 05:08:33,095 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=12, Invalid=30, Unknown=0, NotChecked=0, Total=42 [2023-11-19 05:08:33,095 INFO L87 Difference]: Start difference. First operand 79 states and 86 transitions. Second operand has 7 states, 5 states have (on average 1.8) internal successors, (9), 6 states have internal predecessors, (9), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-11-19 05:08:33,251 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:08:33,251 INFO L93 Difference]: Finished difference Result 77 states and 84 transitions. [2023-11-19 05:08:33,252 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-11-19 05:08:33,252 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 5 states have (on average 1.8) internal successors, (9), 6 states have internal predecessors, (9), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 11 [2023-11-19 05:08:33,252 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:08:33,253 INFO L225 Difference]: With dead ends: 77 [2023-11-19 05:08:33,253 INFO L226 Difference]: Without dead ends: 77 [2023-11-19 05:08:33,254 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 7 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 3 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=17, Invalid=39, Unknown=0, NotChecked=0, Total=56 [2023-11-19 05:08:33,255 INFO L413 NwaCegarLoop]: 60 mSDtfsCounter, 13 mSDsluCounter, 176 mSDsCounter, 0 mSdLazyCounter, 162 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 13 SdHoareTripleChecker+Valid, 236 SdHoareTripleChecker+Invalid, 164 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 162 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-19 05:08:33,256 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [13 Valid, 236 Invalid, 164 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 162 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-19 05:08:33,257 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 77 states. [2023-11-19 05:08:33,261 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 77 to 77. [2023-11-19 05:08:33,262 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 77 states, 41 states have (on average 1.951219512195122) internal successors, (80), 73 states have internal predecessors, (80), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-11-19 05:08:33,263 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 77 states to 77 states and 84 transitions. [2023-11-19 05:08:33,263 INFO L78 Accepts]: Start accepts. Automaton has 77 states and 84 transitions. Word has length 11 [2023-11-19 05:08:33,263 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:08:33,263 INFO L495 AbstractCegarLoop]: Abstraction has 77 states and 84 transitions. [2023-11-19 05:08:33,264 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 5 states have (on average 1.8) internal successors, (9), 6 states have internal predecessors, (9), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-11-19 05:08:33,264 INFO L276 IsEmpty]: Start isEmpty. Operand 77 states and 84 transitions. [2023-11-19 05:08:33,264 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2023-11-19 05:08:33,265 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:08:33,265 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 05:08:33,265 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2023-11-19 05:08:33,265 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 38 more)] === [2023-11-19 05:08:33,266 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:08:33,266 INFO L85 PathProgramCache]: Analyzing trace with hash -1239076542, now seen corresponding path program 1 times [2023-11-19 05:08:33,266 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:08:33,266 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [476565850] [2023-11-19 05:08:33,267 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:08:33,267 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:08:33,283 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:08:33,353 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 05:08:33,353 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:08:33,353 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [476565850] [2023-11-19 05:08:33,354 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [476565850] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-19 05:08:33,354 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-19 05:08:33,354 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2023-11-19 05:08:33,354 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1101177526] [2023-11-19 05:08:33,355 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 05:08:33,355 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-11-19 05:08:33,355 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:08:33,356 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-11-19 05:08:33,356 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-11-19 05:08:33,356 INFO L87 Difference]: Start difference. First operand 77 states and 84 transitions. Second operand has 6 states, 4 states have (on average 2.25) internal successors, (9), 5 states have internal predecessors, (9), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-11-19 05:08:33,514 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:08:33,515 INFO L93 Difference]: Finished difference Result 75 states and 82 transitions. [2023-11-19 05:08:33,515 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-11-19 05:08:33,515 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 4 states have (on average 2.25) internal successors, (9), 5 states have internal predecessors, (9), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 11 [2023-11-19 05:08:33,516 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:08:33,517 INFO L225 Difference]: With dead ends: 75 [2023-11-19 05:08:33,517 INFO L226 Difference]: Without dead ends: 75 [2023-11-19 05:08:33,517 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2023-11-19 05:08:33,519 INFO L413 NwaCegarLoop]: 60 mSDtfsCounter, 9 mSDsluCounter, 145 mSDsCounter, 0 mSdLazyCounter, 185 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 9 SdHoareTripleChecker+Valid, 205 SdHoareTripleChecker+Invalid, 187 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 185 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-19 05:08:33,519 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [9 Valid, 205 Invalid, 187 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 185 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-19 05:08:33,520 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 75 states. [2023-11-19 05:08:33,524 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 75 to 75. [2023-11-19 05:08:33,525 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 75 states, 41 states have (on average 1.9024390243902438) internal successors, (78), 71 states have internal predecessors, (78), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-11-19 05:08:33,526 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 75 states to 75 states and 82 transitions. [2023-11-19 05:08:33,527 INFO L78 Accepts]: Start accepts. Automaton has 75 states and 82 transitions. Word has length 11 [2023-11-19 05:08:33,527 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:08:33,527 INFO L495 AbstractCegarLoop]: Abstraction has 75 states and 82 transitions. [2023-11-19 05:08:33,527 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 4 states have (on average 2.25) internal successors, (9), 5 states have internal predecessors, (9), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-11-19 05:08:33,528 INFO L276 IsEmpty]: Start isEmpty. Operand 75 states and 82 transitions. [2023-11-19 05:08:33,528 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2023-11-19 05:08:33,528 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:08:33,528 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 05:08:33,529 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2023-11-19 05:08:33,529 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr4REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 38 more)] === [2023-11-19 05:08:33,530 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:08:33,530 INFO L85 PathProgramCache]: Analyzing trace with hash 1914633650, now seen corresponding path program 1 times [2023-11-19 05:08:33,530 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:08:33,530 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1770525908] [2023-11-19 05:08:33,530 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:08:33,531 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:08:33,561 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:08:33,597 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 05:08:33,597 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:08:33,598 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1770525908] [2023-11-19 05:08:33,598 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1770525908] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-19 05:08:33,598 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-19 05:08:33,598 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-11-19 05:08:33,598 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [223419002] [2023-11-19 05:08:33,599 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-19 05:08:33,599 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-19 05:08:33,599 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:08:33,600 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-19 05:08:33,600 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-19 05:08:33,600 INFO L87 Difference]: Start difference. First operand 75 states and 82 transitions. Second operand has 3 states, 3 states have (on average 4.0) internal successors, (12), 3 states have internal predecessors, (12), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-11-19 05:08:33,638 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:08:33,639 INFO L93 Difference]: Finished difference Result 81 states and 89 transitions. [2023-11-19 05:08:33,639 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-19 05:08:33,639 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 4.0) internal successors, (12), 3 states have internal predecessors, (12), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 14 [2023-11-19 05:08:33,640 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:08:33,641 INFO L225 Difference]: With dead ends: 81 [2023-11-19 05:08:33,641 INFO L226 Difference]: Without dead ends: 81 [2023-11-19 05:08:33,641 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 3 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-19 05:08:33,642 INFO L413 NwaCegarLoop]: 67 mSDtfsCounter, 1 mSDsluCounter, 62 mSDsCounter, 0 mSdLazyCounter, 31 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 129 SdHoareTripleChecker+Invalid, 32 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 31 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-19 05:08:33,643 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1 Valid, 129 Invalid, 32 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 31 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-19 05:08:33,644 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2023-11-19 05:08:33,648 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 80. [2023-11-19 05:08:33,649 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 80 states, 45 states have (on average 1.8222222222222222) internal successors, (82), 75 states have internal predecessors, (82), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-11-19 05:08:33,650 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 88 transitions. [2023-11-19 05:08:33,650 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 88 transitions. Word has length 14 [2023-11-19 05:08:33,650 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:08:33,650 INFO L495 AbstractCegarLoop]: Abstraction has 80 states and 88 transitions. [2023-11-19 05:08:33,650 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 4.0) internal successors, (12), 3 states have internal predecessors, (12), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-11-19 05:08:33,651 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 88 transitions. [2023-11-19 05:08:33,651 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2023-11-19 05:08:33,652 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:08:33,652 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-19 05:08:33,652 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5 [2023-11-19 05:08:33,652 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr6REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 38 more)] === [2023-11-19 05:08:33,653 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:08:33,653 INFO L85 PathProgramCache]: Analyzing trace with hash -1434822009, now seen corresponding path program 1 times [2023-11-19 05:08:33,653 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:08:33,653 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1104421326] [2023-11-19 05:08:33,654 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:08:33,654 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:08:33,686 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:08:33,776 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-11-19 05:08:33,776 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:08:33,776 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1104421326] [2023-11-19 05:08:33,776 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1104421326] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 05:08:33,777 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1177837739] [2023-11-19 05:08:33,777 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:08:33,777 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:08:33,777 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9ae95ef-3e5d-42cc-86a9-521edaf3958d/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 05:08:33,780 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9ae95ef-3e5d-42cc-86a9-521edaf3958d/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 05:08:33,810 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9ae95ef-3e5d-42cc-86a9-521edaf3958d/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-11-19 05:08:33,937 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:08:33,939 INFO L262 TraceCheckSpWp]: Trace formula consists of 285 conjuncts, 5 conjunts are in the unsatisfiable core [2023-11-19 05:08:33,951 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 05:08:34,028 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 6 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 05:08:34,032 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-19 05:08:34,080 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-11-19 05:08:34,081 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1177837739] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-19 05:08:34,081 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1309971066] [2023-11-19 05:08:34,101 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2023-11-19 05:08:34,101 INFO L166 IcfgInterpreter]: Building call graph [2023-11-19 05:08:34,105 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-19 05:08:34,110 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-19 05:08:34,111 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-19 05:08:37,043 INFO L197 IcfgInterpreter]: Interpreting procedure node_create with input of size 33 for LOIs [2023-11-19 05:08:37,142 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-19 05:08:42,496 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1233#(and (= |ULTIMATE.start_dll_append_~data#1| 1) (<= 1 |#StackHeapBarrier|) (<= 2 |ULTIMATE.start_dll_append_#in~head#1.base|) (or (and (exists ((|v_old(#memory_$Pointer$.offset)_AFTER_CALL_9| (Array Int (Array Int Int)))) (= (select (select |v_old(#memory_$Pointer$.offset)_AFTER_CALL_9| |ULTIMATE.start_main_~#s~0#1.base|) 0) 0)) (exists ((|v_old(#memory_$Pointer$.base)_AFTER_CALL_9| (Array Int (Array Int Int)))) (= |ULTIMATE.start_dll_create_#res#1.base| (select (select |v_old(#memory_$Pointer$.base)_AFTER_CALL_9| |ULTIMATE.start_main_~#s~0#1.base|) 0))) (exists ((|v_#length_75| (Array Int Int))) (= |#length| (store |v_#length_75| |ULTIMATE.start_dll_append_~new_last~0#1.base| 12))) (exists ((|v_#valid_90| (Array Int Int))) (and (= (store |v_#valid_90| |ULTIMATE.start_dll_append_~new_last~0#1.base| 1) |#valid|) (= (select |v_#valid_90| |ULTIMATE.start_dll_append_~new_last~0#1.base|) 0))) (= |ULTIMATE.start_dll_append_#in~head#1.base| |ULTIMATE.start_main_~#s~0#1.base|) (<= (+ |ULTIMATE.start_dll_append_~new_last~0#1.base| 1) |#StackHeapBarrier|) (not (= |ULTIMATE.start_dll_append_~new_last~0#1.base| 0)) (exists ((|v_#memory_$Pointer$.offset_70| (Array Int (Array Int Int)))) (= |#memory_$Pointer$.offset| (store |v_#memory_$Pointer$.offset_70| |ULTIMATE.start_dll_append_~new_last~0#1.base| (store (store (store (select |v_#memory_$Pointer$.offset_70| |ULTIMATE.start_dll_append_~new_last~0#1.base|) 4 0) 8 0) 0 (select (select |#memory_$Pointer$.offset| |ULTIMATE.start_dll_append_~new_last~0#1.base|) 0))))) (exists ((|v_#memory_int_51| (Array Int (Array Int Int))) (|v_#memory_int_49| (Array Int (Array Int Int))) (|v_#memory_int_50| (Array Int (Array Int Int)))) (and (= |#memory_int| (store |v_#memory_int_51| |ULTIMATE.start_dll_append_~new_last~0#1.base| (store (select |v_#memory_int_51| |ULTIMATE.start_dll_append_~new_last~0#1.base|) 0 1))) (= (store |v_#memory_int_50| |ULTIMATE.start_dll_append_~new_last~0#1.base| (store (select |v_#memory_int_50| |ULTIMATE.start_dll_append_~new_last~0#1.base|) 8 (select (select |v_#memory_int_51| |ULTIMATE.start_dll_append_~new_last~0#1.base|) 8))) |v_#memory_int_51|) (= (store |v_#memory_int_49| |ULTIMATE.start_dll_append_~new_last~0#1.base| (store (select |v_#memory_int_49| |ULTIMATE.start_dll_append_~new_last~0#1.base|) 4 (select (select |v_#memory_int_50| |ULTIMATE.start_dll_append_~new_last~0#1.base|) 4))) |v_#memory_int_50|))) (exists ((|v_#memory_$Pointer$.base_70| (Array Int (Array Int Int)))) (= |#memory_$Pointer$.base| (store |v_#memory_$Pointer$.base_70| |ULTIMATE.start_dll_append_~new_last~0#1.base| (store (store (store (select |v_#memory_$Pointer$.base_70| |ULTIMATE.start_dll_append_~new_last~0#1.base|) 4 0) 8 0) 0 (select (select |#memory_$Pointer$.base| |ULTIMATE.start_dll_append_~new_last~0#1.base|) 0))))) (= |ULTIMATE.start_dll_append_~head#1.base| |ULTIMATE.start_dll_append_#in~head#1.base|)) (and (exists ((|v_#memory_$Pointer$.offset_BEFORE_CALL_16| (Array Int (Array Int Int)))) (= (select (select |v_#memory_$Pointer$.offset_BEFORE_CALL_16| |ULTIMATE.start_main_~#s~0#1.base|) 0) 0)) (exists ((|v_#length_75| (Array Int Int))) (= |#length| (store |v_#length_75| |ULTIMATE.start_dll_append_~new_last~0#1.base| 12))) (exists ((|v_#valid_90| (Array Int Int))) (and (= (store |v_#valid_90| |ULTIMATE.start_dll_append_~new_last~0#1.base| 1) |#valid|) (= (select |v_#valid_90| |ULTIMATE.start_dll_append_~new_last~0#1.base|) 0))) (= |ULTIMATE.start_dll_append_#in~head#1.base| |ULTIMATE.start_main_~#s~0#1.base|) (<= (+ |ULTIMATE.start_dll_append_~new_last~0#1.base| 1) |#StackHeapBarrier|) (not (= |ULTIMATE.start_dll_append_~new_last~0#1.base| 0)) (exists ((|v_#memory_$Pointer$.offset_70| (Array Int (Array Int Int)))) (= |#memory_$Pointer$.offset| (store |v_#memory_$Pointer$.offset_70| |ULTIMATE.start_dll_append_~new_last~0#1.base| (store (store (store (select |v_#memory_$Pointer$.offset_70| |ULTIMATE.start_dll_append_~new_last~0#1.base|) 4 0) 8 0) 0 (select (select |#memory_$Pointer$.offset| |ULTIMATE.start_dll_append_~new_last~0#1.base|) 0))))) (exists ((|v_#memory_int_51| (Array Int (Array Int Int))) (|v_#memory_int_49| (Array Int (Array Int Int))) (|v_#memory_int_50| (Array Int (Array Int Int)))) (and (= |#memory_int| (store |v_#memory_int_51| |ULTIMATE.start_dll_append_~new_last~0#1.base| (store (select |v_#memory_int_51| |ULTIMATE.start_dll_append_~new_last~0#1.base|) 0 1))) (= (store |v_#memory_int_50| |ULTIMATE.start_dll_append_~new_last~0#1.base| (store (select |v_#memory_int_50| |ULTIMATE.start_dll_append_~new_last~0#1.base|) 8 (select (select |v_#memory_int_51| |ULTIMATE.start_dll_append_~new_last~0#1.base|) 8))) |v_#memory_int_51|) (= (store |v_#memory_int_49| |ULTIMATE.start_dll_append_~new_last~0#1.base| (store (select |v_#memory_int_49| |ULTIMATE.start_dll_append_~new_last~0#1.base|) 4 (select (select |v_#memory_int_50| |ULTIMATE.start_dll_append_~new_last~0#1.base|) 4))) |v_#memory_int_50|))) (exists ((|v_old(#memory_$Pointer$.base)_AFTER_CALL_10| (Array Int (Array Int Int)))) (= |ULTIMATE.start_dll_create_#res#1.base| (select (select |v_old(#memory_$Pointer$.base)_AFTER_CALL_10| |ULTIMATE.start_main_~#s~0#1.base|) 0))) (exists ((|v_#memory_$Pointer$.base_70| (Array Int (Array Int Int)))) (= |#memory_$Pointer$.base| (store |v_#memory_$Pointer$.base_70| |ULTIMATE.start_dll_append_~new_last~0#1.base| (store (store (store (select |v_#memory_$Pointer$.base_70| |ULTIMATE.start_dll_append_~new_last~0#1.base|) 4 0) 8 0) 0 (select (select |#memory_$Pointer$.base| |ULTIMATE.start_dll_append_~new_last~0#1.base|) 0))))) (= |ULTIMATE.start_dll_append_~head#1.base| |ULTIMATE.start_dll_append_#in~head#1.base|))) (= |ULTIMATE.start_dll_append_~new_last~0#1.offset| 0) (= |ULTIMATE.start_dll_append_~head#1.offset| 0) (not (= (select |#valid| |ULTIMATE.start_dll_append_~head#1.base|) 1)) (= |ULTIMATE.start_main_~data~0#1| 1) (= |ULTIMATE.start_dll_append_#in~data#1| 1) (= |ULTIMATE.start_main_~#s~0#1.offset| 0) (= |ULTIMATE.start_main_~len~0#1| 2) (= |ULTIMATE.start_dll_create_#res#1.offset| 0) (= |ULTIMATE.start_dll_append_#in~head#1.offset| 0))' at error location [2023-11-19 05:08:42,497 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-19 05:08:42,497 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-19 05:08:42,497 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 4 [2023-11-19 05:08:42,497 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [326918109] [2023-11-19 05:08:42,498 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-19 05:08:42,498 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 4 states [2023-11-19 05:08:42,498 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:08:42,499 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 4 interpolants. [2023-11-19 05:08:42,499 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=62, Invalid=317, Unknown=1, NotChecked=0, Total=380 [2023-11-19 05:08:42,500 INFO L87 Difference]: Start difference. First operand 80 states and 88 transitions. Second operand has 4 states, 4 states have (on average 5.0) internal successors, (20), 4 states have internal predecessors, (20), 2 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2023-11-19 05:08:42,540 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:08:42,540 INFO L93 Difference]: Finished difference Result 82 states and 90 transitions. [2023-11-19 05:08:42,541 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-11-19 05:08:42,541 INFO L78 Accepts]: Start accepts. Automaton has has 4 states, 4 states have (on average 5.0) internal successors, (20), 4 states have internal predecessors, (20), 2 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 24 [2023-11-19 05:08:42,541 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:08:42,542 INFO L225 Difference]: With dead ends: 82 [2023-11-19 05:08:42,542 INFO L226 Difference]: Without dead ends: 82 [2023-11-19 05:08:42,543 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 74 GetRequests, 54 SyntacticMatches, 2 SemanticMatches, 18 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 40 ImplicationChecksByTransitivity, 5.4s TimeCoverageRelationStatistics Valid=62, Invalid=317, Unknown=1, NotChecked=0, Total=380 [2023-11-19 05:08:42,544 INFO L413 NwaCegarLoop]: 67 mSDtfsCounter, 9 mSDsluCounter, 66 mSDsCounter, 0 mSdLazyCounter, 29 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 10 SdHoareTripleChecker+Valid, 133 SdHoareTripleChecker+Invalid, 30 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 29 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-19 05:08:42,544 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [10 Valid, 133 Invalid, 30 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 29 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-19 05:08:42,545 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2023-11-19 05:08:42,550 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 82. [2023-11-19 05:08:42,550 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 82 states, 47 states have (on average 1.7872340425531914) internal successors, (84), 77 states have internal predecessors, (84), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-11-19 05:08:42,551 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 90 transitions. [2023-11-19 05:08:42,552 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 90 transitions. Word has length 24 [2023-11-19 05:08:42,552 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:08:42,552 INFO L495 AbstractCegarLoop]: Abstraction has 82 states and 90 transitions. [2023-11-19 05:08:42,552 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 4 states, 4 states have (on average 5.0) internal successors, (20), 4 states have internal predecessors, (20), 2 states have call successors, (3), 2 states have call predecessors, (3), 2 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2023-11-19 05:08:42,553 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 90 transitions. [2023-11-19 05:08:42,553 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2023-11-19 05:08:42,553 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:08:42,554 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1] [2023-11-19 05:08:42,581 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9ae95ef-3e5d-42cc-86a9-521edaf3958d/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Ended with exit code 0 [2023-11-19 05:08:42,777 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9ae95ef-3e5d-42cc-86a9-521edaf3958d/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2023-11-19 05:08:42,777 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr4REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 38 more)] === [2023-11-19 05:08:42,778 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:08:42,778 INFO L85 PathProgramCache]: Analyzing trace with hash 253483419, now seen corresponding path program 1 times [2023-11-19 05:08:42,778 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:08:42,778 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [750120549] [2023-11-19 05:08:42,778 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:08:42,779 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:08:42,814 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:08:43,192 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 5 proven. 7 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 05:08:43,192 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:08:43,192 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [750120549] [2023-11-19 05:08:43,193 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [750120549] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 05:08:43,193 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [986999188] [2023-11-19 05:08:43,193 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:08:43,193 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:08:43,193 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9ae95ef-3e5d-42cc-86a9-521edaf3958d/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 05:08:43,194 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9ae95ef-3e5d-42cc-86a9-521edaf3958d/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 05:08:43,212 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9ae95ef-3e5d-42cc-86a9-521edaf3958d/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-11-19 05:08:43,330 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:08:43,332 INFO L262 TraceCheckSpWp]: Trace formula consists of 298 conjuncts, 16 conjunts are in the unsatisfiable core [2023-11-19 05:08:43,335 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 05:08:43,362 WARN L876 $PredicateComparison]: unable to prove that (exists ((|node_create_~temp~0#1.base| Int)) (= |c_#valid| (store |c_old(#valid)| |node_create_~temp~0#1.base| 1))) is different from true [2023-11-19 05:08:43,405 INFO L349 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2023-11-19 05:08:43,406 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 12 treesize of output 14 [2023-11-19 05:08:43,424 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 10 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 05:08:43,424 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-19 05:08:43,572 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 10 proven. 2 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 05:08:43,572 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [986999188] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-19 05:08:43,572 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1814048515] [2023-11-19 05:08:43,575 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-11-19 05:08:43,575 INFO L166 IcfgInterpreter]: Building call graph [2023-11-19 05:08:43,575 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-19 05:08:43,575 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-19 05:08:43,576 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-19 05:08:45,288 INFO L197 IcfgInterpreter]: Interpreting procedure node_create with input of size 122 for LOIs [2023-11-19 05:08:45,709 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-19 05:08:51,833 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1582#(and (= |ULTIMATE.start_dll_create_~new_head~0#1.offset| 0) (<= 1 |#StackHeapBarrier|) (not (= |ULTIMATE.start_dll_create_~head~0#1.base| 0)) (not (= (select |#valid| |ULTIMATE.start_dll_create_~head~0#1.base|) 1)) (exists ((|v_#memory_$Pointer$.offset_107| (Array Int (Array Int Int))) (|v_#memory_$Pointer$.offset_108| (Array Int (Array Int Int)))) (and (= |v_#memory_$Pointer$.offset_108| (store |v_#memory_$Pointer$.offset_107| |ULTIMATE.start_dll_create_~new_head~0#1.base| (store (select |v_#memory_$Pointer$.offset_107| |ULTIMATE.start_dll_create_~new_head~0#1.base|) 0 (select (select |v_#memory_$Pointer$.offset_108| |ULTIMATE.start_dll_create_~new_head~0#1.base|) 0)))) (= |#memory_$Pointer$.offset| (store |v_#memory_$Pointer$.offset_108| |ULTIMATE.start_dll_create_~new_head~0#1.base| (store (select |v_#memory_$Pointer$.offset_108| |ULTIMATE.start_dll_create_~new_head~0#1.base|) 4 0))))) (= (select |#valid| |ULTIMATE.start_dll_create_~new_head~0#1.base|) 1) (= |ULTIMATE.start_dll_create_#in~len#1| 2) (<= |ULTIMATE.start_dll_create_~len#1| 2) (exists ((|v_#memory_$Pointer$.base_108| (Array Int (Array Int Int))) (|v_#memory_$Pointer$.base_107| (Array Int (Array Int Int)))) (and (= |#memory_$Pointer$.base| (store |v_#memory_$Pointer$.base_108| |ULTIMATE.start_dll_create_~new_head~0#1.base| (store (select |v_#memory_$Pointer$.base_108| |ULTIMATE.start_dll_create_~new_head~0#1.base|) 4 |ULTIMATE.start_dll_create_~head~0#1.base|))) (= (store |v_#memory_$Pointer$.base_107| |ULTIMATE.start_dll_create_~new_head~0#1.base| (store (select |v_#memory_$Pointer$.base_107| |ULTIMATE.start_dll_create_~new_head~0#1.base|) 0 (select (select |v_#memory_$Pointer$.base_108| |ULTIMATE.start_dll_create_~new_head~0#1.base|) 0))) |v_#memory_$Pointer$.base_108|))) (= |ULTIMATE.start_main_~data~0#1| 1) (= |ULTIMATE.start_dll_create_#in~data#1| 1) (= |ULTIMATE.start_main_~#s~0#1.offset| 0) (= |ULTIMATE.start_main_~len~0#1| 2) (= |ULTIMATE.start_dll_create_~head~0#1.offset| 0) (<= 8 (select |#length| |ULTIMATE.start_dll_create_~new_head~0#1.base|)) (<= 2 |ULTIMATE.start_main_~#s~0#1.base|) (exists ((|v_#memory_int_86| (Array Int (Array Int Int)))) (= |#memory_int| (store |v_#memory_int_86| |ULTIMATE.start_dll_create_~new_head~0#1.base| (store (store (select |v_#memory_int_86| |ULTIMATE.start_dll_create_~new_head~0#1.base|) 0 1) 4 (select (select |#memory_int| |ULTIMATE.start_dll_create_~new_head~0#1.base|) 4))))) (= |ULTIMATE.start_dll_create_~data#1| 1))' at error location [2023-11-19 05:08:51,833 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-19 05:08:51,833 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-19 05:08:51,834 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 5, 4] total 12 [2023-11-19 05:08:51,834 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1072348135] [2023-11-19 05:08:51,834 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-19 05:08:51,835 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 13 states [2023-11-19 05:08:51,835 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:08:51,835 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 13 interpolants. [2023-11-19 05:08:51,836 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=103, Invalid=550, Unknown=1, NotChecked=48, Total=702 [2023-11-19 05:08:51,836 INFO L87 Difference]: Start difference. First operand 82 states and 90 transitions. Second operand has 13 states, 10 states have (on average 4.0) internal successors, (40), 11 states have internal predecessors, (40), 2 states have call successors, (3), 3 states have call predecessors, (3), 5 states have return successors, (5), 3 states have call predecessors, (5), 2 states have call successors, (5) [2023-11-19 05:08:52,284 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:08:52,284 INFO L93 Difference]: Finished difference Result 81 states and 89 transitions. [2023-11-19 05:08:52,284 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 10 states. [2023-11-19 05:08:52,285 INFO L78 Accepts]: Start accepts. Automaton has has 13 states, 10 states have (on average 4.0) internal successors, (40), 11 states have internal predecessors, (40), 2 states have call successors, (3), 3 states have call predecessors, (3), 5 states have return successors, (5), 3 states have call predecessors, (5), 2 states have call successors, (5) Word has length 27 [2023-11-19 05:08:52,285 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:08:52,286 INFO L225 Difference]: With dead ends: 81 [2023-11-19 05:08:52,286 INFO L226 Difference]: Without dead ends: 81 [2023-11-19 05:08:52,286 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 95 GetRequests, 63 SyntacticMatches, 4 SemanticMatches, 28 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 170 ImplicationChecksByTransitivity, 6.3s TimeCoverageRelationStatistics Valid=120, Invalid=695, Unknown=1, NotChecked=54, Total=870 [2023-11-19 05:08:52,287 INFO L413 NwaCegarLoop]: 59 mSDtfsCounter, 9 mSDsluCounter, 245 mSDsCounter, 0 mSdLazyCounter, 362 mSolverCounterSat, 9 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 9 SdHoareTripleChecker+Valid, 304 SdHoareTripleChecker+Invalid, 454 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 9 IncrementalHoareTripleChecker+Valid, 362 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 83 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-11-19 05:08:52,288 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [9 Valid, 304 Invalid, 454 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [9 Valid, 362 Invalid, 0 Unknown, 83 Unchecked, 0.3s Time] [2023-11-19 05:08:52,289 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2023-11-19 05:08:52,292 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 81. [2023-11-19 05:08:52,293 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 81 states, 47 states have (on average 1.7659574468085106) internal successors, (83), 76 states have internal predecessors, (83), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-11-19 05:08:52,294 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 81 states to 81 states and 89 transitions. [2023-11-19 05:08:52,294 INFO L78 Accepts]: Start accepts. Automaton has 81 states and 89 transitions. Word has length 27 [2023-11-19 05:08:52,294 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:08:52,294 INFO L495 AbstractCegarLoop]: Abstraction has 81 states and 89 transitions. [2023-11-19 05:08:52,294 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 13 states, 10 states have (on average 4.0) internal successors, (40), 11 states have internal predecessors, (40), 2 states have call successors, (3), 3 states have call predecessors, (3), 5 states have return successors, (5), 3 states have call predecessors, (5), 2 states have call successors, (5) [2023-11-19 05:08:52,294 INFO L276 IsEmpty]: Start isEmpty. Operand 81 states and 89 transitions. [2023-11-19 05:08:52,295 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2023-11-19 05:08:52,295 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:08:52,295 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1] [2023-11-19 05:08:52,329 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9ae95ef-3e5d-42cc-86a9-521edaf3958d/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2023-11-19 05:08:52,529 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9ae95ef-3e5d-42cc-86a9-521edaf3958d/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:08:52,529 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 38 more)] === [2023-11-19 05:08:52,530 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:08:52,530 INFO L85 PathProgramCache]: Analyzing trace with hash 253483420, now seen corresponding path program 1 times [2023-11-19 05:08:52,530 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:08:52,530 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1882580251] [2023-11-19 05:08:52,530 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:08:52,530 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:08:52,572 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:08:53,063 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 3 proven. 9 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-19 05:08:53,063 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:08:53,064 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1882580251] [2023-11-19 05:08:53,064 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1882580251] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 05:08:53,064 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [956813398] [2023-11-19 05:08:53,064 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:08:53,064 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:08:53,064 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9ae95ef-3e5d-42cc-86a9-521edaf3958d/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 05:08:53,065 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9ae95ef-3e5d-42cc-86a9-521edaf3958d/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 05:08:53,066 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9ae95ef-3e5d-42cc-86a9-521edaf3958d/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-11-19 05:08:53,194 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:08:53,196 INFO L262 TraceCheckSpWp]: Trace formula consists of 298 conjuncts, 27 conjunts are in the unsatisfiable core [2023-11-19 05:08:53,199 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 05:08:53,207 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 [2023-11-19 05:08:53,379 WARN L876 $PredicateComparison]: unable to prove that (exists ((|node_create_~temp~0#1.base| Int)) (and (= (store |c_old(#length)| |node_create_~temp~0#1.base| (select |c_#length| |node_create_~temp~0#1.base|)) |c_#length|) (= 0 (select |c_old(#valid)| |node_create_~temp~0#1.base|)))) is different from true [2023-11-19 05:08:53,453 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-19 05:08:53,454 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 [2023-11-19 05:08:53,462 INFO L349 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2023-11-19 05:08:53,462 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 11 treesize of output 11 [2023-11-19 05:08:53,484 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 3 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 5 not checked. [2023-11-19 05:08:53,485 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-19 05:08:53,621 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [956813398] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 05:08:53,621 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [699222867] [2023-11-19 05:08:53,624 INFO L159 IcfgInterpreter]: Started Sifa with 16 locations of interest [2023-11-19 05:08:53,624 INFO L166 IcfgInterpreter]: Building call graph [2023-11-19 05:08:53,624 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-19 05:08:53,625 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-19 05:08:53,625 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-19 05:08:55,158 INFO L197 IcfgInterpreter]: Interpreting procedure node_create with input of size 122 for LOIs [2023-11-19 05:08:55,531 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-19 05:09:01,840 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1881#(and (= |ULTIMATE.start_dll_create_~new_head~0#1.offset| 0) (<= 1 |#StackHeapBarrier|) (not (= |ULTIMATE.start_dll_create_~head~0#1.base| 0)) (<= (select |#length| |ULTIMATE.start_dll_create_~head~0#1.base|) 11) (= (select |#valid| |ULTIMATE.start_dll_create_~new_head~0#1.base|) 1) (= |ULTIMATE.start_dll_create_#in~len#1| 2) (<= |ULTIMATE.start_dll_create_~len#1| 2) (exists ((|v_#memory_$Pointer$.offset_127| (Array Int (Array Int Int))) (|v_#memory_$Pointer$.offset_128| (Array Int (Array Int Int)))) (and (= |v_#memory_$Pointer$.offset_128| (store |v_#memory_$Pointer$.offset_127| |ULTIMATE.start_dll_create_~new_head~0#1.base| (store (select |v_#memory_$Pointer$.offset_127| |ULTIMATE.start_dll_create_~new_head~0#1.base|) 0 (select (select |v_#memory_$Pointer$.offset_128| |ULTIMATE.start_dll_create_~new_head~0#1.base|) 0)))) (= |#memory_$Pointer$.offset| (store |v_#memory_$Pointer$.offset_128| |ULTIMATE.start_dll_create_~new_head~0#1.base| (store (select |v_#memory_$Pointer$.offset_128| |ULTIMATE.start_dll_create_~new_head~0#1.base|) 4 0))))) (exists ((|v_#memory_$Pointer$.base_128| (Array Int (Array Int Int))) (|v_#memory_$Pointer$.base_127| (Array Int (Array Int Int)))) (and (= (store |v_#memory_$Pointer$.base_127| |ULTIMATE.start_dll_create_~new_head~0#1.base| (store (select |v_#memory_$Pointer$.base_127| |ULTIMATE.start_dll_create_~new_head~0#1.base|) 0 (select (select |v_#memory_$Pointer$.base_128| |ULTIMATE.start_dll_create_~new_head~0#1.base|) 0))) |v_#memory_$Pointer$.base_128|) (= (store |v_#memory_$Pointer$.base_128| |ULTIMATE.start_dll_create_~new_head~0#1.base| (store (select |v_#memory_$Pointer$.base_128| |ULTIMATE.start_dll_create_~new_head~0#1.base|) 4 |ULTIMATE.start_dll_create_~head~0#1.base|)) |#memory_$Pointer$.base|))) (= |ULTIMATE.start_main_~data~0#1| 1) (= |ULTIMATE.start_dll_create_#in~data#1| 1) (= |ULTIMATE.start_main_~#s~0#1.offset| 0) (= |ULTIMATE.start_main_~len~0#1| 2) (= |ULTIMATE.start_dll_create_~head~0#1.offset| 0) (<= 8 (select |#length| |ULTIMATE.start_dll_create_~new_head~0#1.base|)) (exists ((|v_#memory_int_106| (Array Int (Array Int Int)))) (= (store |v_#memory_int_106| |ULTIMATE.start_dll_create_~new_head~0#1.base| (store (store (select |v_#memory_int_106| |ULTIMATE.start_dll_create_~new_head~0#1.base|) 0 1) 4 (select (select |#memory_int| |ULTIMATE.start_dll_create_~new_head~0#1.base|) 4))) |#memory_int|)) (<= 2 |ULTIMATE.start_main_~#s~0#1.base|) (= |ULTIMATE.start_dll_create_~data#1| 1))' at error location [2023-11-19 05:09:01,840 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-19 05:09:01,841 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-11-19 05:09:01,841 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 10] total 16 [2023-11-19 05:09:01,841 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1245927891] [2023-11-19 05:09:01,841 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-11-19 05:09:01,841 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2023-11-19 05:09:01,842 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-19 05:09:01,842 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2023-11-19 05:09:01,843 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=113, Invalid=882, Unknown=1, NotChecked=60, Total=1056 [2023-11-19 05:09:01,843 INFO L87 Difference]: Start difference. First operand 81 states and 89 transitions. Second operand has 17 states, 13 states have (on average 2.6923076923076925) internal successors, (35), 14 states have internal predecessors, (35), 2 states have call successors, (2), 2 states have call predecessors, (2), 4 states have return successors, (4), 3 states have call predecessors, (4), 2 states have call successors, (4) [2023-11-19 05:09:02,459 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-19 05:09:02,460 INFO L93 Difference]: Finished difference Result 81 states and 89 transitions. [2023-11-19 05:09:02,460 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 11 states. [2023-11-19 05:09:02,460 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 13 states have (on average 2.6923076923076925) internal successors, (35), 14 states have internal predecessors, (35), 2 states have call successors, (2), 2 states have call predecessors, (2), 4 states have return successors, (4), 3 states have call predecessors, (4), 2 states have call successors, (4) Word has length 27 [2023-11-19 05:09:02,461 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-19 05:09:02,461 INFO L225 Difference]: With dead ends: 81 [2023-11-19 05:09:02,461 INFO L226 Difference]: Without dead ends: 81 [2023-11-19 05:09:02,462 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 75 GetRequests, 39 SyntacticMatches, 0 SemanticMatches, 36 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 275 ImplicationChecksByTransitivity, 6.8s TimeCoverageRelationStatistics Valid=156, Invalid=1179, Unknown=1, NotChecked=70, Total=1406 [2023-11-19 05:09:02,463 INFO L413 NwaCegarLoop]: 59 mSDtfsCounter, 9 mSDsluCounter, 275 mSDsCounter, 0 mSdLazyCounter, 423 mSolverCounterSat, 6 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 9 SdHoareTripleChecker+Valid, 334 SdHoareTripleChecker+Invalid, 512 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 6 IncrementalHoareTripleChecker+Valid, 423 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 83 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-11-19 05:09:02,463 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [9 Valid, 334 Invalid, 512 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [6 Valid, 423 Invalid, 0 Unknown, 83 Unchecked, 0.4s Time] [2023-11-19 05:09:02,464 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 81 states. [2023-11-19 05:09:02,467 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 81 to 80. [2023-11-19 05:09:02,468 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 80 states, 47 states have (on average 1.7446808510638299) internal successors, (82), 75 states have internal predecessors, (82), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-11-19 05:09:02,469 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 80 states to 80 states and 88 transitions. [2023-11-19 05:09:02,469 INFO L78 Accepts]: Start accepts. Automaton has 80 states and 88 transitions. Word has length 27 [2023-11-19 05:09:02,469 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-19 05:09:02,469 INFO L495 AbstractCegarLoop]: Abstraction has 80 states and 88 transitions. [2023-11-19 05:09:02,470 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 13 states have (on average 2.6923076923076925) internal successors, (35), 14 states have internal predecessors, (35), 2 states have call successors, (2), 2 states have call predecessors, (2), 4 states have return successors, (4), 3 states have call predecessors, (4), 2 states have call successors, (4) [2023-11-19 05:09:02,470 INFO L276 IsEmpty]: Start isEmpty. Operand 80 states and 88 transitions. [2023-11-19 05:09:02,471 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 38 [2023-11-19 05:09:02,471 INFO L187 NwaCegarLoop]: Found error trace [2023-11-19 05:09:02,471 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1] [2023-11-19 05:09:02,497 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9ae95ef-3e5d-42cc-86a9-521edaf3958d/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2023-11-19 05:09:02,672 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9ae95ef-3e5d-42cc-86a9-521edaf3958d/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:09:02,672 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr6REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 38 more)] === [2023-11-19 05:09:02,673 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-19 05:09:02,673 INFO L85 PathProgramCache]: Analyzing trace with hash 1703421744, now seen corresponding path program 2 times [2023-11-19 05:09:02,673 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-19 05:09:02,673 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [419759310] [2023-11-19 05:09:02,673 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-19 05:09:02,673 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-19 05:09:02,708 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-19 05:09:02,851 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 5 proven. 14 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2023-11-19 05:09:02,851 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-19 05:09:02,852 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [419759310] [2023-11-19 05:09:02,852 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [419759310] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 05:09:02,852 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1112707785] [2023-11-19 05:09:02,852 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-19 05:09:02,852 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-19 05:09:02,853 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9ae95ef-3e5d-42cc-86a9-521edaf3958d/bin/utaipan-verify-t7M7D8N6sZ/z3 [2023-11-19 05:09:02,854 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9ae95ef-3e5d-42cc-86a9-521edaf3958d/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-19 05:09:02,876 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_d9ae95ef-3e5d-42cc-86a9-521edaf3958d/bin/utaipan-verify-t7M7D8N6sZ/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-11-19 05:09:03,204 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 3 check-sat command(s) [2023-11-19 05:09:03,204 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-19 05:09:03,206 INFO L262 TraceCheckSpWp]: Trace formula consists of 415 conjuncts, 22 conjunts are in the unsatisfiable core [2023-11-19 05:09:03,212 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-19 05:09:03,219 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2023-11-19 05:09:03,242 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 5 treesize of output 3 [2023-11-19 05:09:03,255 WARN L876 $PredicateComparison]: unable to prove that (exists ((|node_create_~temp~0#1.base| Int)) (= |c_#valid| (store |c_old(#valid)| |node_create_~temp~0#1.base| 1))) is different from true [2023-11-19 05:09:03,280 INFO L349 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2023-11-19 05:09:03,280 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 12 treesize of output 14 [2023-11-19 05:09:03,323 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 5 treesize of output 3 [2023-11-19 05:09:03,331 WARN L876 $PredicateComparison]: unable to prove that (exists ((|node_create_~temp~0#1.base| Int)) (and (<= (+ |node_create_~temp~0#1.base| 1) |c_#StackHeapBarrier|) (= |c_#valid| (store |c_old(#valid)| |node_create_~temp~0#1.base| (select |c_#valid| |node_create_~temp~0#1.base|))))) is different from true [2023-11-19 05:09:03,364 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-19 05:09:03,364 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 [2023-11-19 05:09:03,405 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 5 treesize of output 3 [2023-11-19 05:09:03,444 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-19 05:09:03,445 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 [2023-11-19 05:09:03,467 INFO L134 CoverageAnalysis]: Checked inductivity of 27 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 17 trivial. 10 not checked. [2023-11-19 05:09:03,467 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-19 05:09:03,531 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1112707785] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-19 05:09:03,531 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1745761767] [2023-11-19 05:09:03,534 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2023-11-19 05:09:03,534 INFO L166 IcfgInterpreter]: Building call graph [2023-11-19 05:09:03,534 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-19 05:09:03,535 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-19 05:09:03,535 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-19 05:09:05,351 INFO L197 IcfgInterpreter]: Interpreting procedure node_create with input of size 163 for LOIs [2023-11-19 05:09:05,932 INFO L180 IcfgInterpreter]: Interpretation finished