./Ultimate.py --spec ../../sv-benchmarks/c/properties/valid-memsafety.prp --file ../../sv-benchmarks/c/list-simple/sll2c_append_unequal.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for memory safety (deref-memtrack) Using default analysis Version 30e01a73 Calling Ultimate with: /usr/lib/jvm/java-11-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a6fde7e3-802d-4241-9771-2470dd320a15/bin/utaipan-verify-mE87zJ7Ire/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a6fde7e3-802d-4241-9771-2470dd320a15/bin/utaipan-verify-mE87zJ7Ire/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a6fde7e3-802d-4241-9771-2470dd320a15/bin/utaipan-verify-mE87zJ7Ire/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a6fde7e3-802d-4241-9771-2470dd320a15/bin/utaipan-verify-mE87zJ7Ire/config/TaipanMemDerefMemtrack.xml -i ../../sv-benchmarks/c/list-simple/sll2c_append_unequal.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a6fde7e3-802d-4241-9771-2470dd320a15/bin/utaipan-verify-mE87zJ7Ire/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a6fde7e3-802d-4241-9771-2470dd320a15/bin/utaipan-verify-mE87zJ7Ire --witnessprinter.witness.filename witness --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash d83e632829c1e193271bd76b90e08187eb94c70000e5f11d7aea101b3ec9a9e6 --- Real Ultimate output --- This is Ultimate 0.2.3-dev-30e01a7 [2023-11-23 21:29:44,023 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-11-23 21:29:44,177 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a6fde7e3-802d-4241-9771-2470dd320a15/bin/utaipan-verify-mE87zJ7Ire/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Default.epf [2023-11-23 21:29:44,185 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-11-23 21:29:44,185 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-11-23 21:29:44,219 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-11-23 21:29:44,220 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-11-23 21:29:44,221 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-11-23 21:29:44,221 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-11-23 21:29:44,226 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-11-23 21:29:44,227 INFO L153 SettingsManager]: * User list type=DISABLED [2023-11-23 21:29:44,228 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-11-23 21:29:44,229 INFO L153 SettingsManager]: * Explicit value domain=true [2023-11-23 21:29:44,230 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-11-23 21:29:44,231 INFO L153 SettingsManager]: * Octagon Domain=false [2023-11-23 21:29:44,231 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-11-23 21:29:44,231 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-11-23 21:29:44,232 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-11-23 21:29:44,232 INFO L153 SettingsManager]: * Interval Domain=false [2023-11-23 21:29:44,233 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-11-23 21:29:44,233 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-11-23 21:29:44,234 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2023-11-23 21:29:44,235 INFO L151 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2023-11-23 21:29:44,235 INFO L153 SettingsManager]: * Create parallel compositions if possible=false [2023-11-23 21:29:44,236 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-11-23 21:29:44,236 INFO L153 SettingsManager]: * sizeof long=4 [2023-11-23 21:29:44,237 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-11-23 21:29:44,237 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-11-23 21:29:44,238 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-11-23 21:29:44,238 INFO L153 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2023-11-23 21:29:44,239 INFO L153 SettingsManager]: * Bitprecise bitfields=true [2023-11-23 21:29:44,240 INFO L153 SettingsManager]: * SV-COMP memtrack compatibility mode=true [2023-11-23 21:29:44,240 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-11-23 21:29:44,240 INFO L153 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2023-11-23 21:29:44,241 INFO L153 SettingsManager]: * Check unreachability of reach_error function=false [2023-11-23 21:29:44,241 INFO L153 SettingsManager]: * sizeof long double=12 [2023-11-23 21:29:44,241 INFO L153 SettingsManager]: * Use constant arrays=true [2023-11-23 21:29:44,241 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-11-23 21:29:44,242 INFO L153 SettingsManager]: * Only consider context switches at boundaries of atomic blocks=true [2023-11-23 21:29:44,242 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-11-23 21:29:44,242 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-23 21:29:44,243 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-11-23 21:29:44,243 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-11-23 21:29:44,243 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-11-23 21:29:44,244 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-11-23 21:29:44,244 INFO L153 SettingsManager]: * Apply one-shot large block encoding in concurrent analysis=false [2023-11-23 21:29:44,244 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-11-23 21:29:44,245 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-11-23 21:29:44,245 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_a6fde7e3-802d-4241-9771-2470dd320a15/bin/utaipan-verify-mE87zJ7Ire/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a6fde7e3-802d-4241-9771-2470dd320a15/bin/utaipan-verify-mE87zJ7Ire Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> d83e632829c1e193271bd76b90e08187eb94c70000e5f11d7aea101b3ec9a9e6 [2023-11-23 21:29:44,590 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-11-23 21:29:44,623 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-11-23 21:29:44,627 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-11-23 21:29:44,628 INFO L270 PluginConnector]: Initializing CDTParser... [2023-11-23 21:29:44,629 INFO L274 PluginConnector]: CDTParser initialized [2023-11-23 21:29:44,630 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a6fde7e3-802d-4241-9771-2470dd320a15/bin/utaipan-verify-mE87zJ7Ire/../../sv-benchmarks/c/list-simple/sll2c_append_unequal.i [2023-11-23 21:29:47,632 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-11-23 21:29:47,891 INFO L384 CDTParser]: Found 1 translation units. [2023-11-23 21:29:47,892 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a6fde7e3-802d-4241-9771-2470dd320a15/sv-benchmarks/c/list-simple/sll2c_append_unequal.i [2023-11-23 21:29:47,922 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a6fde7e3-802d-4241-9771-2470dd320a15/bin/utaipan-verify-mE87zJ7Ire/data/b91d8a935/df33736979004d64ad38230957aa3f8b/FLAG52aa1a867 [2023-11-23 21:29:47,939 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a6fde7e3-802d-4241-9771-2470dd320a15/bin/utaipan-verify-mE87zJ7Ire/data/b91d8a935/df33736979004d64ad38230957aa3f8b [2023-11-23 21:29:47,946 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-11-23 21:29:47,948 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-11-23 21:29:47,952 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-11-23 21:29:47,952 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-11-23 21:29:47,957 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-11-23 21:29:47,958 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 09:29:47" (1/1) ... [2023-11-23 21:29:47,959 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@37e6f5ed and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:29:47, skipping insertion in model container [2023-11-23 21:29:47,959 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 09:29:47" (1/1) ... [2023-11-23 21:29:48,027 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-11-23 21:29:48,375 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-23 21:29:48,390 INFO L202 MainTranslator]: Completed pre-run [2023-11-23 21:29:48,500 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-23 21:29:48,540 INFO L206 MainTranslator]: Completed translation [2023-11-23 21:29:48,541 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:29:48 WrapperNode [2023-11-23 21:29:48,541 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-11-23 21:29:48,543 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-11-23 21:29:48,543 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-11-23 21:29:48,543 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-11-23 21:29:48,551 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:29:48" (1/1) ... [2023-11-23 21:29:48,594 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:29:48" (1/1) ... [2023-11-23 21:29:48,625 INFO L138 Inliner]: procedures = 127, calls = 47, calls flagged for inlining = 7, calls inlined = 7, statements flattened = 170 [2023-11-23 21:29:48,625 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-11-23 21:29:48,626 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-11-23 21:29:48,626 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-11-23 21:29:48,626 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-11-23 21:29:48,636 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:29:48" (1/1) ... [2023-11-23 21:29:48,637 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:29:48" (1/1) ... [2023-11-23 21:29:48,648 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:29:48" (1/1) ... [2023-11-23 21:29:48,648 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:29:48" (1/1) ... [2023-11-23 21:29:48,658 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:29:48" (1/1) ... [2023-11-23 21:29:48,681 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:29:48" (1/1) ... [2023-11-23 21:29:48,684 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:29:48" (1/1) ... [2023-11-23 21:29:48,695 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:29:48" (1/1) ... [2023-11-23 21:29:48,699 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-11-23 21:29:48,706 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-11-23 21:29:48,707 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-11-23 21:29:48,708 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-11-23 21:29:48,708 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:29:48" (1/1) ... [2023-11-23 21:29:48,715 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-23 21:29:48,727 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a6fde7e3-802d-4241-9771-2470dd320a15/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:29:48,763 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a6fde7e3-802d-4241-9771-2470dd320a15/bin/utaipan-verify-mE87zJ7Ire/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-11-23 21:29:48,828 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-11-23 21:29:48,828 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-11-23 21:29:48,828 INFO L130 BoogieDeclarations]: Found specification of procedure node_create [2023-11-23 21:29:48,828 INFO L138 BoogieDeclarations]: Found implementation of procedure node_create [2023-11-23 21:29:48,829 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2023-11-23 21:29:48,829 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-11-23 21:29:48,829 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2023-11-23 21:29:48,831 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2023-11-23 21:29:48,831 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2023-11-23 21:29:48,832 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-11-23 21:29:48,832 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~$Pointer$ [2023-11-23 21:29:48,832 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-11-23 21:29:48,833 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-11-23 21:29:48,833 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-11-23 21:29:48,826 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a6fde7e3-802d-4241-9771-2470dd320a15/bin/utaipan-verify-mE87zJ7Ire/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-11-23 21:29:48,975 INFO L241 CfgBuilder]: Building ICFG [2023-11-23 21:29:48,978 INFO L267 CfgBuilder]: Building CFG for each procedure with an implementation [2023-11-23 21:29:49,447 INFO L282 CfgBuilder]: Performing block encoding [2023-11-23 21:29:49,553 INFO L304 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-11-23 21:29:49,554 INFO L309 CfgBuilder]: Removed 5 assume(true) statements. [2023-11-23 21:29:49,556 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 09:29:49 BoogieIcfgContainer [2023-11-23 21:29:49,556 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-11-23 21:29:49,558 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-11-23 21:29:49,558 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-11-23 21:29:49,562 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-11-23 21:29:49,562 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.11 09:29:47" (1/3) ... [2023-11-23 21:29:49,563 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7f27d92a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 09:29:49, skipping insertion in model container [2023-11-23 21:29:49,563 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:29:48" (2/3) ... [2023-11-23 21:29:49,564 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@7f27d92a and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 09:29:49, skipping insertion in model container [2023-11-23 21:29:49,564 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 09:29:49" (3/3) ... [2023-11-23 21:29:49,565 INFO L112 eAbstractionObserver]: Analyzing ICFG sll2c_append_unequal.i [2023-11-23 21:29:49,586 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-11-23 21:29:49,586 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 58 error locations. [2023-11-23 21:29:49,633 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-11-23 21:29:49,640 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;@77e63683, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-11-23 21:29:49,640 INFO L358 AbstractCegarLoop]: Starting to check reachability of 58 error locations. [2023-11-23 21:29:49,645 INFO L276 IsEmpty]: Start isEmpty. Operand has 118 states, 55 states have (on average 2.327272727272727) internal successors, (128), 113 states have internal predecessors, (128), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-11-23 21:29:49,653 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2023-11-23 21:29:49,653 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:29:49,654 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1] [2023-11-23 21:29:49,654 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting node_createErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 55 more)] === [2023-11-23 21:29:49,660 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:29:49,661 INFO L85 PathProgramCache]: Analyzing trace with hash 256229600, now seen corresponding path program 1 times [2023-11-23 21:29:49,672 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:29:49,673 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [191981014] [2023-11-23 21:29:49,673 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:29:49,674 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:29:49,802 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:29:49,926 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 21:29:49,927 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:29:49,927 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [191981014] [2023-11-23 21:29:49,928 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [191981014] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 21:29:49,928 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-23 21:29:49,928 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-11-23 21:29:49,930 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2053100675] [2023-11-23 21:29:49,931 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:29:49,935 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-23 21:29:49,936 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:29:49,966 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-23 21:29:49,967 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-23 21:29:49,970 INFO L87 Difference]: Start difference. First operand has 118 states, 55 states have (on average 2.327272727272727) internal successors, (128), 113 states have internal predecessors, (128), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) Second operand has 3 states, 2 states have (on average 2.0) internal successors, (4), 3 states have internal predecessors, (4), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:29:50,155 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:29:50,155 INFO L93 Difference]: Finished difference Result 115 states and 126 transitions. [2023-11-23 21:29:50,157 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-23 21:29:50,158 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 2.0) internal successors, (4), 3 states have internal predecessors, (4), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 5 [2023-11-23 21:29:50,159 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:29:50,167 INFO L225 Difference]: With dead ends: 115 [2023-11-23 21:29:50,168 INFO L226 Difference]: Without dead ends: 113 [2023-11-23 21:29:50,170 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-23 21:29:50,174 INFO L413 NwaCegarLoop]: 104 mSDtfsCounter, 6 mSDsluCounter, 59 mSDsCounter, 0 mSdLazyCounter, 81 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 163 SdHoareTripleChecker+Invalid, 82 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 81 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-23 21:29:50,175 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [6 Valid, 163 Invalid, 82 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 81 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-23 21:29:50,195 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 113 states. [2023-11-23 21:29:50,222 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 113 to 113. [2023-11-23 21:29:50,224 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 113 states, 53 states have (on average 2.207547169811321) internal successors, (117), 108 states have internal predecessors, (117), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-11-23 21:29:50,227 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 113 states to 113 states and 123 transitions. [2023-11-23 21:29:50,228 INFO L78 Accepts]: Start accepts. Automaton has 113 states and 123 transitions. Word has length 5 [2023-11-23 21:29:50,229 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:29:50,229 INFO L495 AbstractCegarLoop]: Abstraction has 113 states and 123 transitions. [2023-11-23 21:29:50,229 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 2.0) internal successors, (4), 3 states have internal predecessors, (4), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:29:50,229 INFO L276 IsEmpty]: Start isEmpty. Operand 113 states and 123 transitions. [2023-11-23 21:29:50,230 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2023-11-23 21:29:50,230 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:29:50,230 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1] [2023-11-23 21:29:50,231 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-11-23 21:29:50,231 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting node_createErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 55 more)] === [2023-11-23 21:29:50,232 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:29:50,232 INFO L85 PathProgramCache]: Analyzing trace with hash 256229601, now seen corresponding path program 1 times [2023-11-23 21:29:50,233 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:29:50,233 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [788076109] [2023-11-23 21:29:50,233 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:29:50,234 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:29:50,260 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:29:50,432 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 21:29:50,432 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:29:50,433 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [788076109] [2023-11-23 21:29:50,433 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [788076109] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 21:29:50,433 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-23 21:29:50,434 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-11-23 21:29:50,434 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [952827829] [2023-11-23 21:29:50,434 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:29:50,436 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-23 21:29:50,437 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:29:50,438 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-23 21:29:50,438 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-23 21:29:50,439 INFO L87 Difference]: Start difference. First operand 113 states and 123 transitions. Second operand has 3 states, 2 states have (on average 2.0) internal successors, (4), 3 states have internal predecessors, (4), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:29:50,590 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:29:50,590 INFO L93 Difference]: Finished difference Result 111 states and 121 transitions. [2023-11-23 21:29:50,591 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-23 21:29:50,591 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 2 states have (on average 2.0) internal successors, (4), 3 states have internal predecessors, (4), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 5 [2023-11-23 21:29:50,591 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:29:50,593 INFO L225 Difference]: With dead ends: 111 [2023-11-23 21:29:50,593 INFO L226 Difference]: Without dead ends: 111 [2023-11-23 21:29:50,594 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-23 21:29:50,596 INFO L413 NwaCegarLoop]: 103 mSDtfsCounter, 2 mSDsluCounter, 65 mSDsCounter, 0 mSdLazyCounter, 70 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 168 SdHoareTripleChecker+Invalid, 71 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 70 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-23 21:29:50,596 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [2 Valid, 168 Invalid, 71 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 70 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-23 21:29:50,598 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 111 states. [2023-11-23 21:29:50,607 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 111 to 111. [2023-11-23 21:29:50,608 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 111 states, 53 states have (on average 2.169811320754717) internal successors, (115), 106 states have internal predecessors, (115), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-11-23 21:29:50,613 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 111 states to 111 states and 121 transitions. [2023-11-23 21:29:50,614 INFO L78 Accepts]: Start accepts. Automaton has 111 states and 121 transitions. Word has length 5 [2023-11-23 21:29:50,614 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:29:50,614 INFO L495 AbstractCegarLoop]: Abstraction has 111 states and 121 transitions. [2023-11-23 21:29:50,614 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 2 states have (on average 2.0) internal successors, (4), 3 states have internal predecessors, (4), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:29:50,615 INFO L276 IsEmpty]: Start isEmpty. Operand 111 states and 121 transitions. [2023-11-23 21:29:50,615 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2023-11-23 21:29:50,615 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:29:50,615 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:29:50,616 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2023-11-23 21:29:50,616 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 55 more)] === [2023-11-23 21:29:50,617 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:29:50,617 INFO L85 PathProgramCache]: Analyzing trace with hash -523502310, now seen corresponding path program 1 times [2023-11-23 21:29:50,617 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:29:50,618 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [309138983] [2023-11-23 21:29:50,618 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:29:50,618 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:29:50,676 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:29:50,822 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 21:29:50,823 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:29:50,823 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [309138983] [2023-11-23 21:29:50,824 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [309138983] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 21:29:50,824 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-23 21:29:50,824 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-11-23 21:29:50,824 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1620264101] [2023-11-23 21:29:50,825 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:29:50,825 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-23 21:29:50,826 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:29:50,827 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-23 21:29:50,834 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-23 21:29:50,834 INFO L87 Difference]: Start difference. First operand 111 states and 121 transitions. Second operand has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 3 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-11-23 21:29:50,899 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:29:50,899 INFO L93 Difference]: Finished difference Result 112 states and 122 transitions. [2023-11-23 21:29:50,900 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-23 21:29:50,900 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 3 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) Word has length 10 [2023-11-23 21:29:50,900 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:29:50,902 INFO L225 Difference]: With dead ends: 112 [2023-11-23 21:29:50,902 INFO L226 Difference]: Without dead ends: 112 [2023-11-23 21:29:50,903 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 [2023-11-23 21:29:50,904 INFO L413 NwaCegarLoop]: 104 mSDtfsCounter, 4 mSDsluCounter, 98 mSDsCounter, 0 mSdLazyCounter, 32 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 202 SdHoareTripleChecker+Invalid, 33 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 32 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-23 21:29:50,905 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [5 Valid, 202 Invalid, 33 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 32 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-23 21:29:50,906 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 112 states. [2023-11-23 21:29:50,915 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 112 to 112. [2023-11-23 21:29:50,916 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 112 states, 54 states have (on average 2.1481481481481484) internal successors, (116), 107 states have internal predecessors, (116), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-11-23 21:29:50,918 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 112 states to 112 states and 122 transitions. [2023-11-23 21:29:50,918 INFO L78 Accepts]: Start accepts. Automaton has 112 states and 122 transitions. Word has length 10 [2023-11-23 21:29:50,919 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:29:50,920 INFO L495 AbstractCegarLoop]: Abstraction has 112 states and 122 transitions. [2023-11-23 21:29:50,920 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 2.6666666666666665) internal successors, (8), 3 states have internal predecessors, (8), 1 states have call successors, (1), 1 states have call predecessors, (1), 1 states have return successors, (1), 1 states have call predecessors, (1), 1 states have call successors, (1) [2023-11-23 21:29:50,920 INFO L276 IsEmpty]: Start isEmpty. Operand 112 states and 122 transitions. [2023-11-23 21:29:50,921 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2023-11-23 21:29:50,921 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:29:50,922 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:29:50,922 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2023-11-23 21:29:50,922 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 55 more)] === [2023-11-23 21:29:50,923 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:29:50,923 INFO L85 PathProgramCache]: Analyzing trace with hash -439189455, now seen corresponding path program 1 times [2023-11-23 21:29:50,923 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:29:50,924 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1353104522] [2023-11-23 21:29:50,924 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:29:50,924 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:29:50,954 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:29:51,073 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-11-23 21:29:51,073 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:29:51,073 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1353104522] [2023-11-23 21:29:51,074 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1353104522] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 21:29:51,074 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-23 21:29:51,074 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2023-11-23 21:29:51,074 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2101539012] [2023-11-23 21:29:51,075 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:29:51,075 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-11-23 21:29:51,075 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:29:51,076 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-11-23 21:29:51,076 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-11-23 21:29:51,077 INFO L87 Difference]: Start difference. First operand 112 states and 122 transitions. Second operand has 6 states, 4 states have (on average 2.75) internal successors, (11), 5 states have internal predecessors, (11), 1 states have call successors, (2), 1 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2023-11-23 21:29:51,310 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:29:51,310 INFO L93 Difference]: Finished difference Result 111 states and 121 transitions. [2023-11-23 21:29:51,311 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-11-23 21:29:51,311 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 4 states have (on average 2.75) internal successors, (11), 5 states have internal predecessors, (11), 1 states have call successors, (2), 1 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) Word has length 17 [2023-11-23 21:29:51,311 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:29:51,313 INFO L225 Difference]: With dead ends: 111 [2023-11-23 21:29:51,313 INFO L226 Difference]: Without dead ends: 111 [2023-11-23 21:29:51,313 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2023-11-23 21:29:51,315 INFO L413 NwaCegarLoop]: 100 mSDtfsCounter, 3 mSDsluCounter, 228 mSDsCounter, 0 mSdLazyCounter, 264 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 328 SdHoareTripleChecker+Invalid, 265 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 264 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-23 21:29:51,316 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [3 Valid, 328 Invalid, 265 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 264 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-23 21:29:51,317 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 111 states. [2023-11-23 21:29:51,325 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 111 to 111. [2023-11-23 21:29:51,325 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 111 states, 54 states have (on average 2.1296296296296298) internal successors, (115), 106 states have internal predecessors, (115), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-11-23 21:29:51,327 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 111 states to 111 states and 121 transitions. [2023-11-23 21:29:51,327 INFO L78 Accepts]: Start accepts. Automaton has 111 states and 121 transitions. Word has length 17 [2023-11-23 21:29:51,327 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:29:51,328 INFO L495 AbstractCegarLoop]: Abstraction has 111 states and 121 transitions. [2023-11-23 21:29:51,328 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 4 states have (on average 2.75) internal successors, (11), 5 states have internal predecessors, (11), 1 states have call successors, (2), 1 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2023-11-23 21:29:51,328 INFO L276 IsEmpty]: Start isEmpty. Operand 111 states and 121 transitions. [2023-11-23 21:29:51,329 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2023-11-23 21:29:51,329 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:29:51,329 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:29:51,330 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2023-11-23 21:29:51,330 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 55 more)] === [2023-11-23 21:29:51,331 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:29:51,331 INFO L85 PathProgramCache]: Analyzing trace with hash -439189454, now seen corresponding path program 1 times [2023-11-23 21:29:51,331 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:29:51,331 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [164614325] [2023-11-23 21:29:51,332 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:29:51,332 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:29:51,358 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:29:51,576 INFO L134 CoverageAnalysis]: Checked inductivity of 5 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-23 21:29:51,577 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:29:51,577 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [164614325] [2023-11-23 21:29:51,577 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [164614325] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 21:29:51,578 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-23 21:29:51,578 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2023-11-23 21:29:51,578 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1690033792] [2023-11-23 21:29:51,578 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:29:51,579 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-11-23 21:29:51,579 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:29:51,580 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-11-23 21:29:51,580 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-11-23 21:29:51,580 INFO L87 Difference]: Start difference. First operand 111 states and 121 transitions. Second operand has 6 states, 4 states have (on average 3.25) internal successors, (13), 5 states have internal predecessors, (13), 1 states have call successors, (2), 1 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2023-11-23 21:29:51,798 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:29:51,798 INFO L93 Difference]: Finished difference Result 110 states and 120 transitions. [2023-11-23 21:29:51,799 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-11-23 21:29:51,799 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 4 states have (on average 3.25) internal successors, (13), 5 states have internal predecessors, (13), 1 states have call successors, (2), 1 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) Word has length 17 [2023-11-23 21:29:51,799 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:29:51,800 INFO L225 Difference]: With dead ends: 110 [2023-11-23 21:29:51,801 INFO L226 Difference]: Without dead ends: 110 [2023-11-23 21:29:51,801 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2023-11-23 21:29:51,811 INFO L413 NwaCegarLoop]: 100 mSDtfsCounter, 1 mSDsluCounter, 252 mSDsCounter, 0 mSdLazyCounter, 236 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 352 SdHoareTripleChecker+Invalid, 236 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 236 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-23 21:29:51,812 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1 Valid, 352 Invalid, 236 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 236 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-23 21:29:51,814 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 110 states. [2023-11-23 21:29:51,825 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 110 to 110. [2023-11-23 21:29:51,830 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 110 states, 54 states have (on average 2.111111111111111) internal successors, (114), 105 states have internal predecessors, (114), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-11-23 21:29:51,833 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 110 states to 110 states and 120 transitions. [2023-11-23 21:29:51,837 INFO L78 Accepts]: Start accepts. Automaton has 110 states and 120 transitions. Word has length 17 [2023-11-23 21:29:51,838 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:29:51,838 INFO L495 AbstractCegarLoop]: Abstraction has 110 states and 120 transitions. [2023-11-23 21:29:51,839 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 4 states have (on average 3.25) internal successors, (13), 5 states have internal predecessors, (13), 1 states have call successors, (2), 1 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 1 states have call successors, (2) [2023-11-23 21:29:51,839 INFO L276 IsEmpty]: Start isEmpty. Operand 110 states and 120 transitions. [2023-11-23 21:29:51,840 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2023-11-23 21:29:51,840 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:29:51,841 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:29:51,841 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2023-11-23 21:29:51,842 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 55 more)] === [2023-11-23 21:29:51,842 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:29:51,843 INFO L85 PathProgramCache]: Analyzing trace with hash -1154046349, now seen corresponding path program 1 times [2023-11-23 21:29:51,843 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:29:51,844 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [484570599] [2023-11-23 21:29:51,844 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:29:51,844 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:29:51,898 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:29:52,188 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 2 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-23 21:29:52,190 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:29:52,190 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [484570599] [2023-11-23 21:29:52,190 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [484570599] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:29:52,191 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [816394471] [2023-11-23 21:29:52,191 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:29:52,192 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:29:52,195 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a6fde7e3-802d-4241-9771-2470dd320a15/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:29:52,197 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a6fde7e3-802d-4241-9771-2470dd320a15/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:29:52,216 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a6fde7e3-802d-4241-9771-2470dd320a15/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-11-23 21:29:52,348 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:29:52,378 INFO L262 TraceCheckSpWp]: Trace formula consists of 213 conjuncts, 17 conjunts are in the unsatisfiable core [2023-11-23 21:29:52,384 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 21:29:52,446 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2023-11-23 21:29:52,503 WARN L876 $PredicateComparison]: unable to prove that (exists ((|node_create_~temp~0#1.base| Int)) (and (= |c_#valid| (store |c_old(#valid)| |node_create_~temp~0#1.base| (select |c_#valid| |node_create_~temp~0#1.base|))) (= 0 (select |c_old(#valid)| |node_create_~temp~0#1.base|)))) is different from true [2023-11-23 21:29:52,572 INFO L349 Elim1Store]: treesize reduction 20, result has 33.3 percent of original size [2023-11-23 21:29:52,577 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 19 treesize of output 16 [2023-11-23 21:29:52,596 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 1 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 4 not checked. [2023-11-23 21:29:52,596 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-23 21:29:52,676 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [816394471] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:29:52,677 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [69073432] [2023-11-23 21:29:52,701 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-11-23 21:29:52,701 INFO L166 IcfgInterpreter]: Building call graph [2023-11-23 21:29:52,706 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-23 21:29:52,712 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-23 21:29:52,713 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-23 21:29:54,471 INFO L197 IcfgInterpreter]: Interpreting procedure node_create with input of size 59 for LOIs [2023-11-23 21:29:54,604 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-23 21:29:56,453 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1343#(and (not (= (select |#valid| |ULTIMATE.start_sll_circular_create_~last~0#1.base|) 1)) (<= 1 |#StackHeapBarrier|) (= |ULTIMATE.start_sll_circular_create_#in~data#1| 1) (= |ULTIMATE.start_sll_circular_create_~head~0#1.offset| 0) (= |ULTIMATE.start_sll_circular_create_~last~0#1.offset| 0) (<= |ULTIMATE.start_sll_circular_create_~len#1| 1) (= |ULTIMATE.start_main_~data~0#1| 1) (= |ULTIMATE.start_main_~#s~0#1.offset| 0) (= |ULTIMATE.start_main_~len~0#1| 2) (= 2 |ULTIMATE.start_sll_circular_create_#in~len#1|) (<= 2 |ULTIMATE.start_main_~#s~0#1.base|) (= |ULTIMATE.start_sll_circular_create_~data#1| 1))' at error location [2023-11-23 21:29:56,453 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-23 21:29:56,454 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-11-23 21:29:56,454 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 7] total 10 [2023-11-23 21:29:56,454 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [760077222] [2023-11-23 21:29:56,454 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-11-23 21:29:56,455 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2023-11-23 21:29:56,455 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:29:56,455 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2023-11-23 21:29:56,456 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=76, Invalid=433, Unknown=1, NotChecked=42, Total=552 [2023-11-23 21:29:56,456 INFO L87 Difference]: Start difference. First operand 110 states and 120 transitions. Second operand has 11 states, 8 states have (on average 2.375) internal successors, (19), 9 states have internal predecessors, (19), 2 states have call successors, (2), 2 states have call predecessors, (2), 3 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2023-11-23 21:29:56,828 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:29:56,828 INFO L93 Difference]: Finished difference Result 109 states and 119 transitions. [2023-11-23 21:29:56,828 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-11-23 21:29:56,828 INFO L78 Accepts]: Start accepts. Automaton has has 11 states, 8 states have (on average 2.375) internal successors, (19), 9 states have internal predecessors, (19), 2 states have call successors, (2), 2 states have call predecessors, (2), 3 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 19 [2023-11-23 21:29:56,829 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:29:56,830 INFO L225 Difference]: With dead ends: 109 [2023-11-23 21:29:56,830 INFO L226 Difference]: Without dead ends: 109 [2023-11-23 21:29:56,830 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 30 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 105 ImplicationChecksByTransitivity, 2.0s TimeCoverageRelationStatistics Valid=94, Invalid=509, Unknown=1, NotChecked=46, Total=650 [2023-11-23 21:29:56,831 INFO L413 NwaCegarLoop]: 96 mSDtfsCounter, 4 mSDsluCounter, 324 mSDsCounter, 0 mSdLazyCounter, 386 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4 SdHoareTripleChecker+Valid, 420 SdHoareTripleChecker+Invalid, 505 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 386 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 114 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-11-23 21:29:56,832 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [4 Valid, 420 Invalid, 505 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 386 Invalid, 0 Unknown, 114 Unchecked, 0.3s Time] [2023-11-23 21:29:56,833 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 109 states. [2023-11-23 21:29:56,837 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 109 to 109. [2023-11-23 21:29:56,838 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 109 states, 54 states have (on average 2.0925925925925926) internal successors, (113), 104 states have internal predecessors, (113), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-11-23 21:29:56,839 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 109 states to 109 states and 119 transitions. [2023-11-23 21:29:56,839 INFO L78 Accepts]: Start accepts. Automaton has 109 states and 119 transitions. Word has length 19 [2023-11-23 21:29:56,839 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:29:56,839 INFO L495 AbstractCegarLoop]: Abstraction has 109 states and 119 transitions. [2023-11-23 21:29:56,840 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 11 states, 8 states have (on average 2.375) internal successors, (19), 9 states have internal predecessors, (19), 2 states have call successors, (2), 2 states have call predecessors, (2), 3 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2023-11-23 21:29:56,840 INFO L276 IsEmpty]: Start isEmpty. Operand 109 states and 119 transitions. [2023-11-23 21:29:56,840 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2023-11-23 21:29:56,840 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:29:56,840 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:29:56,866 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a6fde7e3-802d-4241-9771-2470dd320a15/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-11-23 21:29:57,057 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a6fde7e3-802d-4241-9771-2470dd320a15/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:29:57,057 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 55 more)] === [2023-11-23 21:29:57,058 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:29:57,058 INFO L85 PathProgramCache]: Analyzing trace with hash -1154046348, now seen corresponding path program 1 times [2023-11-23 21:29:57,058 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:29:57,059 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [477858651] [2023-11-23 21:29:57,059 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:29:57,059 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:29:57,093 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:29:57,548 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 1 proven. 5 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 21:29:57,548 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:29:57,549 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [477858651] [2023-11-23 21:29:57,549 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [477858651] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:29:57,549 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1877013245] [2023-11-23 21:29:57,549 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:29:57,549 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:29:57,550 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a6fde7e3-802d-4241-9771-2470dd320a15/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:29:57,551 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a6fde7e3-802d-4241-9771-2470dd320a15/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:29:57,574 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a6fde7e3-802d-4241-9771-2470dd320a15/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-11-23 21:29:57,676 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:29:57,679 INFO L262 TraceCheckSpWp]: Trace formula consists of 213 conjuncts, 31 conjunts are in the unsatisfiable core [2023-11-23 21:29:57,683 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 21:29:57,692 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2023-11-23 21:29:57,700 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 1 [2023-11-23 21:29:57,826 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 [2023-11-23 21:29:57,853 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-23 21:29:57,855 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 9 [2023-11-23 21:29:57,870 INFO L349 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2023-11-23 21:29:57,870 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 [2023-11-23 21:29:57,899 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 1 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 4 not checked. [2023-11-23 21:29:57,900 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-23 21:29:58,022 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1877013245] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:29:58,022 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1305238638] [2023-11-23 21:29:58,024 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-11-23 21:29:58,024 INFO L166 IcfgInterpreter]: Building call graph [2023-11-23 21:29:58,025 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-23 21:29:58,025 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-23 21:29:58,025 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-23 21:29:59,065 INFO L197 IcfgInterpreter]: Interpreting procedure node_create with input of size 59 for LOIs [2023-11-23 21:29:59,223 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-23 21:30:01,102 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1665#(and (<= 1 |#StackHeapBarrier|) (= |ULTIMATE.start_sll_circular_create_#in~data#1| 1) (= |ULTIMATE.start_sll_circular_create_~head~0#1.offset| 0) (= |ULTIMATE.start_sll_circular_create_~last~0#1.offset| 0) (<= (select |#length| |ULTIMATE.start_sll_circular_create_~last~0#1.base|) 3) (<= |ULTIMATE.start_sll_circular_create_~len#1| 1) (= |ULTIMATE.start_main_~data~0#1| 1) (= |ULTIMATE.start_main_~#s~0#1.offset| 0) (= |ULTIMATE.start_main_~len~0#1| 2) (= 2 |ULTIMATE.start_sll_circular_create_#in~len#1|) (<= 2 |ULTIMATE.start_main_~#s~0#1.base|) (= |ULTIMATE.start_sll_circular_create_~data#1| 1))' at error location [2023-11-23 21:30:01,103 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-23 21:30:01,103 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-11-23 21:30:01,103 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [10, 8] total 16 [2023-11-23 21:30:01,103 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [243209267] [2023-11-23 21:30:01,103 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-11-23 21:30:01,104 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2023-11-23 21:30:01,104 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:30:01,106 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2023-11-23 21:30:01,110 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=105, Invalid=768, Unknown=1, NotChecked=56, Total=930 [2023-11-23 21:30:01,110 INFO L87 Difference]: Start difference. First operand 109 states and 119 transitions. Second operand has 17 states, 13 states have (on average 2.230769230769231) internal successors, (29), 14 states have internal predecessors, (29), 3 states have call successors, (3), 2 states have call predecessors, (3), 4 states have return successors, (4), 4 states have call predecessors, (4), 3 states have call successors, (4) [2023-11-23 21:30:01,780 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:30:01,780 INFO L93 Difference]: Finished difference Result 109 states and 120 transitions. [2023-11-23 21:30:01,780 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2023-11-23 21:30:01,781 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 13 states have (on average 2.230769230769231) internal successors, (29), 14 states have internal predecessors, (29), 3 states have call successors, (3), 2 states have call predecessors, (3), 4 states have return successors, (4), 4 states have call predecessors, (4), 3 states have call successors, (4) Word has length 19 [2023-11-23 21:30:01,781 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:30:01,783 INFO L225 Difference]: With dead ends: 109 [2023-11-23 21:30:01,783 INFO L226 Difference]: Without dead ends: 109 [2023-11-23 21:30:01,784 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 23 SyntacticMatches, 0 SemanticMatches, 31 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 218 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=126, Invalid=869, Unknown=1, NotChecked=60, Total=1056 [2023-11-23 21:30:01,785 INFO L413 NwaCegarLoop]: 96 mSDtfsCounter, 4 mSDsluCounter, 501 mSDsCounter, 0 mSdLazyCounter, 772 mSolverCounterSat, 8 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4 SdHoareTripleChecker+Valid, 597 SdHoareTripleChecker+Invalid, 896 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 8 IncrementalHoareTripleChecker+Valid, 772 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 116 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2023-11-23 21:30:01,785 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [4 Valid, 597 Invalid, 896 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [8 Valid, 772 Invalid, 0 Unknown, 116 Unchecked, 0.6s Time] [2023-11-23 21:30:01,786 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 109 states. [2023-11-23 21:30:01,790 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 109 to 108. [2023-11-23 21:30:01,791 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 108 states, 54 states have (on average 2.074074074074074) internal successors, (112), 103 states have internal predecessors, (112), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-11-23 21:30:01,791 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 108 states to 108 states and 118 transitions. [2023-11-23 21:30:01,792 INFO L78 Accepts]: Start accepts. Automaton has 108 states and 118 transitions. Word has length 19 [2023-11-23 21:30:01,792 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:30:01,792 INFO L495 AbstractCegarLoop]: Abstraction has 108 states and 118 transitions. [2023-11-23 21:30:01,792 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 13 states have (on average 2.230769230769231) internal successors, (29), 14 states have internal predecessors, (29), 3 states have call successors, (3), 2 states have call predecessors, (3), 4 states have return successors, (4), 4 states have call predecessors, (4), 3 states have call successors, (4) [2023-11-23 21:30:01,792 INFO L276 IsEmpty]: Start isEmpty. Operand 108 states and 118 transitions. [2023-11-23 21:30:01,793 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2023-11-23 21:30:01,793 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:30:01,793 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:30:01,823 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a6fde7e3-802d-4241-9771-2470dd320a15/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2023-11-23 21:30:02,009 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a6fde7e3-802d-4241-9771-2470dd320a15/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:30:02,009 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr4REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 55 more)] === [2023-11-23 21:30:02,010 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:30:02,010 INFO L85 PathProgramCache]: Analyzing trace with hash -1424917307, now seen corresponding path program 1 times [2023-11-23 21:30:02,010 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:30:02,010 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [409579252] [2023-11-23 21:30:02,010 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:30:02,010 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:30:02,063 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:30:02,650 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 13 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-11-23 21:30:02,651 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:30:02,651 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [409579252] [2023-11-23 21:30:02,651 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [409579252] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:30:02,651 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [16447970] [2023-11-23 21:30:02,651 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:30:02,651 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:30:02,651 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a6fde7e3-802d-4241-9771-2470dd320a15/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:30:02,661 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a6fde7e3-802d-4241-9771-2470dd320a15/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:30:02,667 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a6fde7e3-802d-4241-9771-2470dd320a15/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-11-23 21:30:02,791 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:30:02,794 INFO L262 TraceCheckSpWp]: Trace formula consists of 322 conjuncts, 22 conjunts are in the unsatisfiable core [2023-11-23 21:30:02,797 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 21:30:02,806 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2023-11-23 21:30:02,813 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 5 treesize of output 3 [2023-11-23 21:30:02,822 WARN L876 $PredicateComparison]: unable to prove that (exists ((|node_create_~temp~0#1.base| Int)) (and (<= (+ |node_create_~temp~0#1.base| 1) |c_#StackHeapBarrier|) (= |c_#valid| (store |c_old(#valid)| |node_create_~temp~0#1.base| (select |c_#valid| |node_create_~temp~0#1.base|))))) is different from true [2023-11-23 21:30:02,848 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-23 21:30:02,849 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 9 [2023-11-23 21:30:02,865 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 5 treesize of output 3 [2023-11-23 21:30:02,894 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-23 21:30:02,895 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 9 [2023-11-23 21:30:02,908 WARN L876 $PredicateComparison]: unable to prove that (exists ((|node_create_~temp~0#1.base| Int)) (= |c_#valid| (store |c_old(#valid)| |node_create_~temp~0#1.base| 1))) is different from true [2023-11-23 21:30:02,924 INFO L349 Elim1Store]: treesize reduction 15, result has 25.0 percent of original size [2023-11-23 21:30:02,924 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 12 treesize of output 14 [2023-11-23 21:30:02,940 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 7 trivial. 8 not checked. [2023-11-23 21:30:02,940 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-23 21:30:03,124 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [16447970] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:30:03,124 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1112162672] [2023-11-23 21:30:03,127 INFO L159 IcfgInterpreter]: Started Sifa with 17 locations of interest [2023-11-23 21:30:03,127 INFO L166 IcfgInterpreter]: Building call graph [2023-11-23 21:30:03,128 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-23 21:30:03,128 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-23 21:30:03,128 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-23 21:30:04,241 INFO L197 IcfgInterpreter]: Interpreting procedure node_create with input of size 8 for LOIs [2023-11-23 21:30:04,267 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-23 21:30:08,007 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2032#(and (or (and (exists ((|v_#valid_145| (Array Int Int))) (and (= (select |v_#valid_145| |ULTIMATE.start_sll_circular_append_~new_last~0#1.base|) 0) (= (store |v_#valid_145| |ULTIMATE.start_sll_circular_append_~new_last~0#1.base| 1) |#valid|))) (= |ULTIMATE.start_sll_circular_append_~head#1.base| |ULTIMATE.start_sll_circular_append_#in~head#1.base|) (exists ((|v_#length_120| (Array Int Int))) (= (store |v_#length_120| |ULTIMATE.start_sll_circular_append_~new_last~0#1.base| 8) |#length|)) (exists ((|v_#memory_$Pointer$.offset_113| (Array Int (Array Int Int)))) (= |#memory_$Pointer$.offset| (store |v_#memory_$Pointer$.offset_113| |ULTIMATE.start_sll_circular_append_~new_last~0#1.base| (store (store (select |v_#memory_$Pointer$.offset_113| |ULTIMATE.start_sll_circular_append_~new_last~0#1.base|) 0 0) 4 (select (select |#memory_$Pointer$.offset| |ULTIMATE.start_sll_circular_append_~new_last~0#1.base|) 4))))) (not (= |ULTIMATE.start_sll_circular_append_~new_last~0#1.base| 0)) (exists ((|v_#memory_$Pointer$.base_113| (Array Int (Array Int Int)))) (= |#memory_$Pointer$.base| (store |v_#memory_$Pointer$.base_113| |ULTIMATE.start_sll_circular_append_~new_last~0#1.base| (store (store (select |v_#memory_$Pointer$.base_113| |ULTIMATE.start_sll_circular_append_~new_last~0#1.base|) 0 0) 4 (select (select |#memory_$Pointer$.base| |ULTIMATE.start_sll_circular_append_~new_last~0#1.base|) 4))))) (exists ((|v_#memory_int_82| (Array Int (Array Int Int))) (|v_#memory_int_83| (Array Int (Array Int Int)))) (and (= |v_#memory_int_83| (store |v_#memory_int_82| |ULTIMATE.start_sll_circular_append_~new_last~0#1.base| (store (select |v_#memory_int_82| |ULTIMATE.start_sll_circular_append_~new_last~0#1.base|) 0 (select (select |v_#memory_int_83| |ULTIMATE.start_sll_circular_append_~new_last~0#1.base|) 0)))) (= |#memory_int| (store |v_#memory_int_83| |ULTIMATE.start_sll_circular_append_~new_last~0#1.base| (store (select |v_#memory_int_83| |ULTIMATE.start_sll_circular_append_~new_last~0#1.base|) 4 5))))) (= |ULTIMATE.start_sll_circular_append_#in~head#1.base| |ULTIMATE.start_main_~#s~0#1.base|) (exists ((|v_#memory_$Pointer$.offset_117| (Array Int (Array Int Int))) (|v_#memory_int_86| (Array Int (Array Int Int))) (|v_old(#valid)_AFTER_CALL_32| (Array Int Int)) (|v_#length_BEFORE_CALL_57| (Array Int Int)) (|v_#memory_$Pointer$.base_117| (Array Int (Array Int Int))) (|v_ULTIMATE.start_sll_circular_create_~last~0#1.base_15| Int) (|v_old(#memory_int)_AFTER_CALL_32| (Array Int (Array Int Int)))) (and (= (select (select (store |v_#memory_$Pointer$.offset_117| |v_ULTIMATE.start_sll_circular_create_~last~0#1.base_15| (store (select |v_#memory_$Pointer$.offset_117| |v_ULTIMATE.start_sll_circular_create_~last~0#1.base_15|) 0 0)) |ULTIMATE.start_main_~#s~0#1.base|) 0) 0) (= (select |v_old(#valid)_AFTER_CALL_32| |v_ULTIMATE.start_sll_circular_create_~last~0#1.base_15|) 1) (= |v_old(#memory_int)_AFTER_CALL_32| (store |v_#memory_int_86| |v_ULTIMATE.start_sll_circular_create_~last~0#1.base_15| (store (select |v_#memory_int_86| |v_ULTIMATE.start_sll_circular_create_~last~0#1.base_15|) 0 (select (select |v_old(#memory_int)_AFTER_CALL_32| |v_ULTIMATE.start_sll_circular_create_~last~0#1.base_15|) 0)))) (= |ULTIMATE.start_sll_circular_create_#res#1.base| (select (select (store |v_#memory_$Pointer$.base_117| |v_ULTIMATE.start_sll_circular_create_~last~0#1.base_15| (store (select |v_#memory_$Pointer$.base_117| |v_ULTIMATE.start_sll_circular_create_~last~0#1.base_15|) 0 |ULTIMATE.start_sll_circular_create_#res#1.base|)) |ULTIMATE.start_main_~#s~0#1.base|) 0)) (<= 4 (select |v_#length_BEFORE_CALL_57| |v_ULTIMATE.start_sll_circular_create_~last~0#1.base_15|)))) (<= (+ |ULTIMATE.start_sll_circular_append_~new_last~0#1.base| 1) |#StackHeapBarrier|)) (and (exists ((|v_#valid_145| (Array Int Int))) (and (= (select |v_#valid_145| |ULTIMATE.start_sll_circular_append_~new_last~0#1.base|) 0) (= (store |v_#valid_145| |ULTIMATE.start_sll_circular_append_~new_last~0#1.base| 1) |#valid|))) (= |ULTIMATE.start_sll_circular_append_~head#1.base| |ULTIMATE.start_sll_circular_append_#in~head#1.base|) (exists ((|v_#length_120| (Array Int Int))) (= (store |v_#length_120| |ULTIMATE.start_sll_circular_append_~new_last~0#1.base| 8) |#length|)) (exists ((|v_#length_BEFORE_CALL_59| (Array Int Int)) (|v_#memory_$Pointer$.offset_117| (Array Int (Array Int Int))) (|v_#memory_int_86| (Array Int (Array Int Int))) (|v_old(#valid)_AFTER_CALL_33| (Array Int Int)) (|v_#memory_$Pointer$.base_117| (Array Int (Array Int Int))) (|v_ULTIMATE.start_sll_circular_create_~last~0#1.base_15| Int) (|v_old(#memory_int)_AFTER_CALL_33| (Array Int (Array Int Int)))) (and (= (select (select (store |v_#memory_$Pointer$.offset_117| |v_ULTIMATE.start_sll_circular_create_~last~0#1.base_15| (store (select |v_#memory_$Pointer$.offset_117| |v_ULTIMATE.start_sll_circular_create_~last~0#1.base_15|) 0 0)) |ULTIMATE.start_main_~#s~0#1.base|) 0) 0) (= |v_old(#memory_int)_AFTER_CALL_33| (store |v_#memory_int_86| |v_ULTIMATE.start_sll_circular_create_~last~0#1.base_15| (store (select |v_#memory_int_86| |v_ULTIMATE.start_sll_circular_create_~last~0#1.base_15|) 0 (select (select |v_old(#memory_int)_AFTER_CALL_33| |v_ULTIMATE.start_sll_circular_create_~last~0#1.base_15|) 0)))) (= |ULTIMATE.start_sll_circular_create_#res#1.base| (select (select (store |v_#memory_$Pointer$.base_117| |v_ULTIMATE.start_sll_circular_create_~last~0#1.base_15| (store (select |v_#memory_$Pointer$.base_117| |v_ULTIMATE.start_sll_circular_create_~last~0#1.base_15|) 0 |ULTIMATE.start_sll_circular_create_#res#1.base|)) |ULTIMATE.start_main_~#s~0#1.base|) 0)) (<= 4 (select |v_#length_BEFORE_CALL_59| |v_ULTIMATE.start_sll_circular_create_~last~0#1.base_15|)) (= (select |v_old(#valid)_AFTER_CALL_33| |v_ULTIMATE.start_sll_circular_create_~last~0#1.base_15|) 1))) (exists ((|v_#memory_$Pointer$.offset_113| (Array Int (Array Int Int)))) (= |#memory_$Pointer$.offset| (store |v_#memory_$Pointer$.offset_113| |ULTIMATE.start_sll_circular_append_~new_last~0#1.base| (store (store (select |v_#memory_$Pointer$.offset_113| |ULTIMATE.start_sll_circular_append_~new_last~0#1.base|) 0 0) 4 (select (select |#memory_$Pointer$.offset| |ULTIMATE.start_sll_circular_append_~new_last~0#1.base|) 4))))) (not (= |ULTIMATE.start_sll_circular_append_~new_last~0#1.base| 0)) (exists ((|v_#memory_$Pointer$.base_113| (Array Int (Array Int Int)))) (= |#memory_$Pointer$.base| (store |v_#memory_$Pointer$.base_113| |ULTIMATE.start_sll_circular_append_~new_last~0#1.base| (store (store (select |v_#memory_$Pointer$.base_113| |ULTIMATE.start_sll_circular_append_~new_last~0#1.base|) 0 0) 4 (select (select |#memory_$Pointer$.base| |ULTIMATE.start_sll_circular_append_~new_last~0#1.base|) 4))))) (exists ((|v_#memory_int_82| (Array Int (Array Int Int))) (|v_#memory_int_83| (Array Int (Array Int Int)))) (and (= |v_#memory_int_83| (store |v_#memory_int_82| |ULTIMATE.start_sll_circular_append_~new_last~0#1.base| (store (select |v_#memory_int_82| |ULTIMATE.start_sll_circular_append_~new_last~0#1.base|) 0 (select (select |v_#memory_int_83| |ULTIMATE.start_sll_circular_append_~new_last~0#1.base|) 0)))) (= |#memory_int| (store |v_#memory_int_83| |ULTIMATE.start_sll_circular_append_~new_last~0#1.base| (store (select |v_#memory_int_83| |ULTIMATE.start_sll_circular_append_~new_last~0#1.base|) 4 5))))) (= |ULTIMATE.start_sll_circular_append_#in~head#1.base| |ULTIMATE.start_main_~#s~0#1.base|) (<= (+ |ULTIMATE.start_sll_circular_append_~new_last~0#1.base| 1) |#StackHeapBarrier|))) (= |ULTIMATE.start_sll_circular_append_#in~head#1.offset| 0) (<= 1 |#StackHeapBarrier|) (= |ULTIMATE.start_sll_circular_create_#res#1.offset| 0) (= |ULTIMATE.start_main_~uneq~0#1| 5) (= 5 |ULTIMATE.start_sll_circular_append_~data#1|) (= |ULTIMATE.start_sll_circular_append_~head#1.offset| 0) (not (= (select |#valid| |ULTIMATE.start_sll_circular_append_~head#1.base|) 1)) (= |ULTIMATE.start_sll_circular_append_~new_last~0#1.offset| 0) (<= 2 |ULTIMATE.start_sll_circular_append_#in~head#1.base|) (= |ULTIMATE.start_main_~data~0#1| 1) (= |ULTIMATE.start_main_~#s~0#1.offset| 0) (= |ULTIMATE.start_main_~len~0#1| 2) (= |ULTIMATE.start_sll_circular_append_#in~data#1| 5))' at error location [2023-11-23 21:30:08,008 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-23 21:30:08,008 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-11-23 21:30:08,008 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [11, 6] total 13 [2023-11-23 21:30:08,013 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [410624690] [2023-11-23 21:30:08,013 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-11-23 21:30:08,014 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 15 states [2023-11-23 21:30:08,014 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:30:08,015 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 15 interpolants. [2023-11-23 21:30:08,016 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=95, Invalid=780, Unknown=3, NotChecked=114, Total=992 [2023-11-23 21:30:08,016 INFO L87 Difference]: Start difference. First operand 108 states and 118 transitions. Second operand has 15 states, 11 states have (on average 2.6363636363636362) internal successors, (29), 13 states have internal predecessors, (29), 2 states have call successors, (3), 1 states have call predecessors, (3), 5 states have return successors, (6), 3 states have call predecessors, (6), 2 states have call successors, (6) [2023-11-23 21:30:08,501 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:30:08,502 INFO L93 Difference]: Finished difference Result 116 states and 127 transitions. [2023-11-23 21:30:08,502 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-11-23 21:30:08,502 INFO L78 Accepts]: Start accepts. Automaton has has 15 states, 11 states have (on average 2.6363636363636362) internal successors, (29), 13 states have internal predecessors, (29), 2 states have call successors, (3), 1 states have call predecessors, (3), 5 states have return successors, (6), 3 states have call predecessors, (6), 2 states have call successors, (6) Word has length 27 [2023-11-23 21:30:08,503 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:30:08,503 INFO L225 Difference]: With dead ends: 116 [2023-11-23 21:30:08,504 INFO L226 Difference]: Without dead ends: 116 [2023-11-23 21:30:08,504 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 83 GetRequests, 48 SyntacticMatches, 3 SemanticMatches, 32 ConstructedPredicates, 2 IntricatePredicates, 0 DeprecatedPredicates, 249 ImplicationChecksByTransitivity, 4.1s TimeCoverageRelationStatistics Valid=111, Invalid=886, Unknown=3, NotChecked=122, Total=1122 [2023-11-23 21:30:08,505 INFO L413 NwaCegarLoop]: 45 mSDtfsCounter, 126 mSDsluCounter, 210 mSDsCounter, 0 mSdLazyCounter, 398 mSolverCounterSat, 12 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 126 SdHoareTripleChecker+Valid, 255 SdHoareTripleChecker+Invalid, 654 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 12 IncrementalHoareTripleChecker+Valid, 398 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 244 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-11-23 21:30:08,505 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [126 Valid, 255 Invalid, 654 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [12 Valid, 398 Invalid, 0 Unknown, 244 Unchecked, 0.4s Time] [2023-11-23 21:30:08,506 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 116 states. [2023-11-23 21:30:08,509 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 116 to 99. [2023-11-23 21:30:08,510 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 99 states, 54 states have (on average 1.9074074074074074) internal successors, (103), 94 states have internal predecessors, (103), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-11-23 21:30:08,510 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 99 states to 99 states and 109 transitions. [2023-11-23 21:30:08,511 INFO L78 Accepts]: Start accepts. Automaton has 99 states and 109 transitions. Word has length 27 [2023-11-23 21:30:08,511 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:30:08,511 INFO L495 AbstractCegarLoop]: Abstraction has 99 states and 109 transitions. [2023-11-23 21:30:08,511 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 15 states, 11 states have (on average 2.6363636363636362) internal successors, (29), 13 states have internal predecessors, (29), 2 states have call successors, (3), 1 states have call predecessors, (3), 5 states have return successors, (6), 3 states have call predecessors, (6), 2 states have call successors, (6) [2023-11-23 21:30:08,511 INFO L276 IsEmpty]: Start isEmpty. Operand 99 states and 109 transitions. [2023-11-23 21:30:08,512 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 28 [2023-11-23 21:30:08,512 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:30:08,512 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:30:08,538 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a6fde7e3-802d-4241-9771-2470dd320a15/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2023-11-23 21:30:08,712 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a6fde7e3-802d-4241-9771-2470dd320a15/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:30:08,713 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 55 more)] === [2023-11-23 21:30:08,713 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:30:08,714 INFO L85 PathProgramCache]: Analyzing trace with hash -1424917306, now seen corresponding path program 1 times [2023-11-23 21:30:08,714 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:30:08,714 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1518682263] [2023-11-23 21:30:08,714 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:30:08,714 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:30:08,772 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:30:09,379 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 10 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-11-23 21:30:09,379 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:30:09,379 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1518682263] [2023-11-23 21:30:09,379 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1518682263] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:30:09,379 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1259905017] [2023-11-23 21:30:09,379 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:30:09,379 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:30:09,380 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a6fde7e3-802d-4241-9771-2470dd320a15/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:30:09,381 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a6fde7e3-802d-4241-9771-2470dd320a15/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:30:09,382 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a6fde7e3-802d-4241-9771-2470dd320a15/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-11-23 21:30:09,517 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:30:09,523 INFO L262 TraceCheckSpWp]: Trace formula consists of 322 conjuncts, 26 conjunts are in the unsatisfiable core [2023-11-23 21:30:09,528 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 21:30:09,534 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 1 [2023-11-23 21:30:09,547 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 5 treesize of output 3 [2023-11-23 21:30:09,554 WARN L876 $PredicateComparison]: unable to prove that (exists ((|node_create_~temp~0#1.base| Int)) (and (<= (+ |node_create_~temp~0#1.base| 1) |c_#StackHeapBarrier|) (= (store |c_old(#length)| |node_create_~temp~0#1.base| (select |c_#length| |node_create_~temp~0#1.base|)) |c_#length|))) is different from true [2023-11-23 21:30:09,583 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-23 21:30:09,584 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 9 [2023-11-23 21:30:09,608 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 5 treesize of output 3 [2023-11-23 21:30:09,641 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-23 21:30:09,642 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 9 [2023-11-23 21:30:09,675 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 5 treesize of output 3 [2023-11-23 21:30:09,711 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-23 21:30:09,712 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 14 treesize of output 9 [2023-11-23 21:30:09,719 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2023-11-23 21:30:09,719 INFO L323 TraceCheckSpWp]: Omiting computation of backward sequence because forward sequence was already perfect [2023-11-23 21:30:09,719 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1259905017] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 21:30:09,720 INFO L185 FreeRefinementEngine]: Found 1 perfect and 1 imperfect interpolant sequences. [2023-11-23 21:30:09,720 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [10] total 11 [2023-11-23 21:30:09,720 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [580047966] [2023-11-23 21:30:09,720 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:30:09,720 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-11-23 21:30:09,721 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:30:09,721 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-11-23 21:30:09,721 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=103, Unknown=1, NotChecked=20, Total=156 [2023-11-23 21:30:09,722 INFO L87 Difference]: Start difference. First operand 99 states and 109 transitions. Second operand has 7 states, 5 states have (on average 2.6) internal successors, (13), 5 states have internal predecessors, (13), 2 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2023-11-23 21:30:09,877 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:30:09,877 INFO L93 Difference]: Finished difference Result 94 states and 104 transitions. [2023-11-23 21:30:09,877 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-11-23 21:30:09,878 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 5 states have (on average 2.6) internal successors, (13), 5 states have internal predecessors, (13), 2 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) Word has length 27 [2023-11-23 21:30:09,878 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:30:09,879 INFO L225 Difference]: With dead ends: 94 [2023-11-23 21:30:09,879 INFO L226 Difference]: Without dead ends: 94 [2023-11-23 21:30:09,879 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 41 GetRequests, 29 SyntacticMatches, 0 SemanticMatches, 12 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 21 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=37, Invalid=122, Unknown=1, NotChecked=22, Total=182 [2023-11-23 21:30:09,880 INFO L413 NwaCegarLoop]: 70 mSDtfsCounter, 25 mSDsluCounter, 144 mSDsCounter, 0 mSdLazyCounter, 164 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 25 SdHoareTripleChecker+Valid, 214 SdHoareTripleChecker+Invalid, 293 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 164 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 125 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-23 21:30:09,880 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [25 Valid, 214 Invalid, 293 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 164 Invalid, 0 Unknown, 125 Unchecked, 0.1s Time] [2023-11-23 21:30:09,881 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 94 states. [2023-11-23 21:30:09,884 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 94 to 94. [2023-11-23 21:30:09,884 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 94 states, 54 states have (on average 1.8148148148148149) internal successors, (98), 89 states have internal predecessors, (98), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-11-23 21:30:09,885 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 94 states to 94 states and 104 transitions. [2023-11-23 21:30:09,885 INFO L78 Accepts]: Start accepts. Automaton has 94 states and 104 transitions. Word has length 27 [2023-11-23 21:30:09,885 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:30:09,885 INFO L495 AbstractCegarLoop]: Abstraction has 94 states and 104 transitions. [2023-11-23 21:30:09,886 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 5 states have (on average 2.6) internal successors, (13), 5 states have internal predecessors, (13), 2 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 2 states have call predecessors, (3), 2 states have call successors, (3) [2023-11-23 21:30:09,886 INFO L276 IsEmpty]: Start isEmpty. Operand 94 states and 104 transitions. [2023-11-23 21:30:09,887 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2023-11-23 21:30:09,887 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:30:09,887 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:30:09,913 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a6fde7e3-802d-4241-9771-2470dd320a15/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2023-11-23 21:30:10,087 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a6fde7e3-802d-4241-9771-2470dd320a15/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:30:10,088 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr6REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 55 more)] === [2023-11-23 21:30:10,088 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:30:10,088 INFO L85 PathProgramCache]: Analyzing trace with hash 749035590, now seen corresponding path program 1 times [2023-11-23 21:30:10,088 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:30:10,088 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1917857219] [2023-11-23 21:30:10,088 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:30:10,088 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:30:10,118 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:30:10,205 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 12 trivial. 0 not checked. [2023-11-23 21:30:10,205 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:30:10,205 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1917857219] [2023-11-23 21:30:10,205 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1917857219] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 21:30:10,206 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-23 21:30:10,206 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2023-11-23 21:30:10,206 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1617573477] [2023-11-23 21:30:10,206 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:30:10,206 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-11-23 21:30:10,207 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:30:10,207 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-11-23 21:30:10,207 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-11-23 21:30:10,207 INFO L87 Difference]: Start difference. First operand 94 states and 104 transitions. Second operand has 6 states, 4 states have (on average 4.25) internal successors, (17), 5 states have internal predecessors, (17), 1 states have call successors, (3), 1 states have call predecessors, (3), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2023-11-23 21:30:10,370 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:30:10,370 INFO L93 Difference]: Finished difference Result 92 states and 102 transitions. [2023-11-23 21:30:10,370 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-11-23 21:30:10,371 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 4 states have (on average 4.25) internal successors, (17), 5 states have internal predecessors, (17), 1 states have call successors, (3), 1 states have call predecessors, (3), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) Word has length 29 [2023-11-23 21:30:10,371 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:30:10,371 INFO L225 Difference]: With dead ends: 92 [2023-11-23 21:30:10,372 INFO L226 Difference]: Without dead ends: 92 [2023-11-23 21:30:10,372 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2023-11-23 21:30:10,373 INFO L413 NwaCegarLoop]: 70 mSDtfsCounter, 22 mSDsluCounter, 187 mSDsCounter, 0 mSdLazyCounter, 219 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 22 SdHoareTripleChecker+Valid, 257 SdHoareTripleChecker+Invalid, 221 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 219 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-23 21:30:10,375 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [22 Valid, 257 Invalid, 221 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 219 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-23 21:30:10,376 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 92 states. [2023-11-23 21:30:10,378 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 92 to 92. [2023-11-23 21:30:10,378 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 92 states, 54 states have (on average 1.7777777777777777) internal successors, (96), 87 states have internal predecessors, (96), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-11-23 21:30:10,379 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 92 states to 92 states and 102 transitions. [2023-11-23 21:30:10,379 INFO L78 Accepts]: Start accepts. Automaton has 92 states and 102 transitions. Word has length 29 [2023-11-23 21:30:10,379 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:30:10,379 INFO L495 AbstractCegarLoop]: Abstraction has 92 states and 102 transitions. [2023-11-23 21:30:10,380 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 4 states have (on average 4.25) internal successors, (17), 5 states have internal predecessors, (17), 1 states have call successors, (3), 1 states have call predecessors, (3), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2023-11-23 21:30:10,380 INFO L276 IsEmpty]: Start isEmpty. Operand 92 states and 102 transitions. [2023-11-23 21:30:10,383 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2023-11-23 21:30:10,383 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:30:10,383 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:30:10,383 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2023-11-23 21:30:10,383 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr7REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 55 more)] === [2023-11-23 21:30:10,384 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:30:10,384 INFO L85 PathProgramCache]: Analyzing trace with hash 749035591, now seen corresponding path program 1 times [2023-11-23 21:30:10,384 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:30:10,384 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1898126950] [2023-11-23 21:30:10,384 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:30:10,384 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:30:10,415 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:30:10,580 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 8 proven. 0 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2023-11-23 21:30:10,580 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:30:10,580 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1898126950] [2023-11-23 21:30:10,580 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1898126950] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 21:30:10,580 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-23 21:30:10,581 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2023-11-23 21:30:10,581 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1536619210] [2023-11-23 21:30:10,581 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:30:10,581 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-11-23 21:30:10,581 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:30:10,582 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-11-23 21:30:10,582 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-11-23 21:30:10,582 INFO L87 Difference]: Start difference. First operand 92 states and 102 transitions. Second operand has 6 states, 4 states have (on average 4.75) internal successors, (19), 5 states have internal predecessors, (19), 1 states have call successors, (3), 1 states have call predecessors, (3), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2023-11-23 21:30:10,746 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:30:10,746 INFO L93 Difference]: Finished difference Result 90 states and 100 transitions. [2023-11-23 21:30:10,747 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-11-23 21:30:10,747 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 4 states have (on average 4.75) internal successors, (19), 5 states have internal predecessors, (19), 1 states have call successors, (3), 1 states have call predecessors, (3), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) Word has length 29 [2023-11-23 21:30:10,747 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:30:10,748 INFO L225 Difference]: With dead ends: 90 [2023-11-23 21:30:10,748 INFO L226 Difference]: Without dead ends: 90 [2023-11-23 21:30:10,748 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2023-11-23 21:30:10,749 INFO L413 NwaCegarLoop]: 70 mSDtfsCounter, 19 mSDsluCounter, 195 mSDsCounter, 0 mSdLazyCounter, 203 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 19 SdHoareTripleChecker+Valid, 265 SdHoareTripleChecker+Invalid, 204 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 203 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-23 21:30:10,749 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [19 Valid, 265 Invalid, 204 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 203 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-23 21:30:10,749 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 90 states. [2023-11-23 21:30:10,751 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 90 to 90. [2023-11-23 21:30:10,751 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 90 states, 54 states have (on average 1.7407407407407407) internal successors, (94), 85 states have internal predecessors, (94), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-11-23 21:30:10,752 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 90 states to 90 states and 100 transitions. [2023-11-23 21:30:10,752 INFO L78 Accepts]: Start accepts. Automaton has 90 states and 100 transitions. Word has length 29 [2023-11-23 21:30:10,752 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:30:10,753 INFO L495 AbstractCegarLoop]: Abstraction has 90 states and 100 transitions. [2023-11-23 21:30:10,753 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 4 states have (on average 4.75) internal successors, (19), 5 states have internal predecessors, (19), 1 states have call successors, (3), 1 states have call predecessors, (3), 2 states have return successors, (3), 2 states have call predecessors, (3), 1 states have call successors, (3) [2023-11-23 21:30:10,753 INFO L276 IsEmpty]: Start isEmpty. Operand 90 states and 100 transitions. [2023-11-23 21:30:10,754 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2023-11-23 21:30:10,754 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:30:10,754 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:30:10,754 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10 [2023-11-23 21:30:10,755 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr12REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 55 more)] === [2023-11-23 21:30:10,755 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:30:10,755 INFO L85 PathProgramCache]: Analyzing trace with hash 1745280876, now seen corresponding path program 1 times [2023-11-23 21:30:10,755 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:30:10,755 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [397552783] [2023-11-23 21:30:10,756 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:30:10,756 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:30:10,781 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:30:11,372 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 12 proven. 1 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-11-23 21:30:11,372 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:30:11,372 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [397552783] [2023-11-23 21:30:11,372 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [397552783] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:30:11,373 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1077627843] [2023-11-23 21:30:11,373 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:30:11,373 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:30:11,373 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a6fde7e3-802d-4241-9771-2470dd320a15/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:30:11,374 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a6fde7e3-802d-4241-9771-2470dd320a15/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:30:11,390 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a6fde7e3-802d-4241-9771-2470dd320a15/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-11-23 21:30:11,689 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:30:11,691 INFO L262 TraceCheckSpWp]: Trace formula consists of 339 conjuncts, 41 conjunts are in the unsatisfiable core [2023-11-23 21:30:11,695 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 21:30:11,736 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 6 treesize of output 5 [2023-11-23 21:30:11,887 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 5 [2023-11-23 21:30:11,992 WARN L876 $PredicateComparison]: unable to prove that (exists ((|node_create_~temp~0#1.base| Int)) (and (<= (+ |node_create_~temp~0#1.base| 1) |c_#StackHeapBarrier|) (= |c_#valid| (store |c_old(#valid)| |node_create_~temp~0#1.base| (select |c_#valid| |node_create_~temp~0#1.base|))) (= |c_#memory_$Pointer$.base| (store |c_old(#memory_$Pointer$.base)| |node_create_~temp~0#1.base| (select |c_#memory_$Pointer$.base| |node_create_~temp~0#1.base|))) (= 0 (select |c_old(#valid)| |node_create_~temp~0#1.base|)))) is different from true [2023-11-23 21:30:12,021 INFO L349 Elim1Store]: treesize reduction 32, result has 36.0 percent of original size [2023-11-23 21:30:12,022 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 2 select indices, 2 select index equivalence classes, 0 disjoint index pairs (out of 1 index pairs), introduced 2 new quantified variables, introduced 2 case distinctions, treesize of input 23 treesize of output 24 [2023-11-23 21:30:12,027 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-23 21:30:12,028 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 19 [2023-11-23 21:30:12,078 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 17 treesize of output 9 [2023-11-23 21:30:12,081 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 11 proven. 3 refuted. 0 times theorem prover too weak. 1 trivial. 1 not checked. [2023-11-23 21:30:12,082 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-23 21:30:12,192 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1077627843] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:30:12,192 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1225198531] [2023-11-23 21:30:12,195 INFO L159 IcfgInterpreter]: Started Sifa with 20 locations of interest [2023-11-23 21:30:12,195 INFO L166 IcfgInterpreter]: Building call graph [2023-11-23 21:30:12,195 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-23 21:30:12,196 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-23 21:30:12,196 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-23 21:30:13,525 INFO L197 IcfgInterpreter]: Interpreting procedure node_create with input of size 8 for LOIs [2023-11-23 21:30:13,547 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-23 21:30:20,202 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3057#(and (= (select (select |#memory_$Pointer$.offset| |ULTIMATE.start_sll_circular_append_~head#1.base|) 0) |ULTIMATE.start_sll_circular_append_~last~1#1.offset|) (= |ULTIMATE.start_sll_circular_append_#in~head#1.offset| 0) (<= 1 |#StackHeapBarrier|) (= |ULTIMATE.start_sll_circular_create_#res#1.offset| 0) (= |ULTIMATE.start_main_~uneq~0#1| 5) (not (= (select |#valid| |ULTIMATE.start_sll_circular_append_~last~1#1.base|) 1)) (= 5 |ULTIMATE.start_sll_circular_append_~data#1|) (or (and (exists ((|v_old(#memory_int)_AFTER_CALL_48| (Array Int (Array Int Int))) (|v_#memory_$Pointer$.offset_129| (Array Int (Array Int Int))) (|v_#memory_int_98| (Array Int (Array Int Int))) (|v_old(#valid)_AFTER_CALL_48| (Array Int Int)) (|v_#length_BEFORE_CALL_86| (Array Int Int)) (|v_#memory_$Pointer$.base_133| (Array Int (Array Int Int))) (|v_ULTIMATE.start_sll_circular_create_~last~0#1.base_16| Int)) (and (= (select (select (store |v_#memory_$Pointer$.offset_129| |v_ULTIMATE.start_sll_circular_create_~last~0#1.base_16| (store (select |v_#memory_$Pointer$.offset_129| |v_ULTIMATE.start_sll_circular_create_~last~0#1.base_16|) 0 0)) |ULTIMATE.start_main_~#s~0#1.base|) 0) 0) (= (select |v_old(#valid)_AFTER_CALL_48| |v_ULTIMATE.start_sll_circular_create_~last~0#1.base_16|) 1) (= |v_old(#memory_int)_AFTER_CALL_48| (store |v_#memory_int_98| |v_ULTIMATE.start_sll_circular_create_~last~0#1.base_16| (store (select |v_#memory_int_98| |v_ULTIMATE.start_sll_circular_create_~last~0#1.base_16|) 0 (select (select |v_old(#memory_int)_AFTER_CALL_48| |v_ULTIMATE.start_sll_circular_create_~last~0#1.base_16|) 0)))) (= |ULTIMATE.start_sll_circular_create_#res#1.base| (select (select (store |v_#memory_$Pointer$.base_133| |v_ULTIMATE.start_sll_circular_create_~last~0#1.base_16| (store (select |v_#memory_$Pointer$.base_133| |v_ULTIMATE.start_sll_circular_create_~last~0#1.base_16|) 0 |ULTIMATE.start_sll_circular_create_#res#1.base|)) |ULTIMATE.start_main_~#s~0#1.base|) 0)) (<= 4 (select |v_#length_BEFORE_CALL_86| |v_ULTIMATE.start_sll_circular_create_~last~0#1.base_16|)))) (exists ((|v_#valid_156| (Array Int Int))) (and (= (store |v_#valid_156| |ULTIMATE.start_sll_circular_append_~new_last~0#1.base| 1) |#valid|) (= (select |v_#valid_156| |ULTIMATE.start_sll_circular_append_~new_last~0#1.base|) 0))) (exists ((|v_#memory_$Pointer$.base_129| (Array Int (Array Int Int)))) (= |#memory_$Pointer$.base| (store |v_#memory_$Pointer$.base_129| |ULTIMATE.start_sll_circular_append_~new_last~0#1.base| (store (store (select |v_#memory_$Pointer$.base_129| |ULTIMATE.start_sll_circular_append_~new_last~0#1.base|) 0 0) 4 (select (select |#memory_$Pointer$.base| |ULTIMATE.start_sll_circular_append_~new_last~0#1.base|) 4))))) (= |ULTIMATE.start_sll_circular_append_~head#1.base| |ULTIMATE.start_sll_circular_append_#in~head#1.base|) (exists ((|v_#memory_int_95| (Array Int (Array Int Int))) (|v_#memory_int_94| (Array Int (Array Int Int)))) (and (= |#memory_int| (store |v_#memory_int_95| |ULTIMATE.start_sll_circular_append_~new_last~0#1.base| (store (select |v_#memory_int_95| |ULTIMATE.start_sll_circular_append_~new_last~0#1.base|) 4 5))) (= |v_#memory_int_95| (store |v_#memory_int_94| |ULTIMATE.start_sll_circular_append_~new_last~0#1.base| (store (select |v_#memory_int_94| |ULTIMATE.start_sll_circular_append_~new_last~0#1.base|) 0 (select (select |v_#memory_int_95| |ULTIMATE.start_sll_circular_append_~new_last~0#1.base|) 0)))))) (exists ((|v_#length_131| (Array Int Int))) (= |#length| (store |v_#length_131| |ULTIMATE.start_sll_circular_append_~new_last~0#1.base| 8))) (not (= |ULTIMATE.start_sll_circular_append_~new_last~0#1.base| 0)) (exists ((|v_#memory_$Pointer$.offset_125| (Array Int (Array Int Int)))) (= |#memory_$Pointer$.offset| (store |v_#memory_$Pointer$.offset_125| |ULTIMATE.start_sll_circular_append_~new_last~0#1.base| (store (store (select |v_#memory_$Pointer$.offset_125| |ULTIMATE.start_sll_circular_append_~new_last~0#1.base|) 0 0) 4 (select (select |#memory_$Pointer$.offset| |ULTIMATE.start_sll_circular_append_~new_last~0#1.base|) 4))))) (= |ULTIMATE.start_sll_circular_append_#in~head#1.base| |ULTIMATE.start_main_~#s~0#1.base|) (<= (+ |ULTIMATE.start_sll_circular_append_~new_last~0#1.base| 1) |#StackHeapBarrier|)) (and (exists ((|v_#valid_156| (Array Int Int))) (and (= (store |v_#valid_156| |ULTIMATE.start_sll_circular_append_~new_last~0#1.base| 1) |#valid|) (= (select |v_#valid_156| |ULTIMATE.start_sll_circular_append_~new_last~0#1.base|) 0))) (exists ((|v_#memory_$Pointer$.base_129| (Array Int (Array Int Int)))) (= |#memory_$Pointer$.base| (store |v_#memory_$Pointer$.base_129| |ULTIMATE.start_sll_circular_append_~new_last~0#1.base| (store (store (select |v_#memory_$Pointer$.base_129| |ULTIMATE.start_sll_circular_append_~new_last~0#1.base|) 0 0) 4 (select (select |#memory_$Pointer$.base| |ULTIMATE.start_sll_circular_append_~new_last~0#1.base|) 4))))) (= |ULTIMATE.start_sll_circular_append_~head#1.base| |ULTIMATE.start_sll_circular_append_#in~head#1.base|) (exists ((|v_#memory_int_95| (Array Int (Array Int Int))) (|v_#memory_int_94| (Array Int (Array Int Int)))) (and (= |#memory_int| (store |v_#memory_int_95| |ULTIMATE.start_sll_circular_append_~new_last~0#1.base| (store (select |v_#memory_int_95| |ULTIMATE.start_sll_circular_append_~new_last~0#1.base|) 4 5))) (= |v_#memory_int_95| (store |v_#memory_int_94| |ULTIMATE.start_sll_circular_append_~new_last~0#1.base| (store (select |v_#memory_int_94| |ULTIMATE.start_sll_circular_append_~new_last~0#1.base|) 0 (select (select |v_#memory_int_95| |ULTIMATE.start_sll_circular_append_~new_last~0#1.base|) 0)))))) (exists ((|v_#length_131| (Array Int Int))) (= |#length| (store |v_#length_131| |ULTIMATE.start_sll_circular_append_~new_last~0#1.base| 8))) (exists ((|v_old(#memory_int)_AFTER_CALL_49| (Array Int (Array Int Int))) (|v_#memory_$Pointer$.offset_129| (Array Int (Array Int Int))) (|v_#memory_int_98| (Array Int (Array Int Int))) (|v_#length_BEFORE_CALL_88| (Array Int Int)) (|v_old(#valid)_AFTER_CALL_49| (Array Int Int)) (|v_#memory_$Pointer$.base_133| (Array Int (Array Int Int))) (|v_ULTIMATE.start_sll_circular_create_~last~0#1.base_16| Int)) (and (= (select (select (store |v_#memory_$Pointer$.offset_129| |v_ULTIMATE.start_sll_circular_create_~last~0#1.base_16| (store (select |v_#memory_$Pointer$.offset_129| |v_ULTIMATE.start_sll_circular_create_~last~0#1.base_16|) 0 0)) |ULTIMATE.start_main_~#s~0#1.base|) 0) 0) (= (select |v_old(#valid)_AFTER_CALL_49| |v_ULTIMATE.start_sll_circular_create_~last~0#1.base_16|) 1) (= |ULTIMATE.start_sll_circular_create_#res#1.base| (select (select (store |v_#memory_$Pointer$.base_133| |v_ULTIMATE.start_sll_circular_create_~last~0#1.base_16| (store (select |v_#memory_$Pointer$.base_133| |v_ULTIMATE.start_sll_circular_create_~last~0#1.base_16|) 0 |ULTIMATE.start_sll_circular_create_#res#1.base|)) |ULTIMATE.start_main_~#s~0#1.base|) 0)) (= |v_old(#memory_int)_AFTER_CALL_49| (store |v_#memory_int_98| |v_ULTIMATE.start_sll_circular_create_~last~0#1.base_16| (store (select |v_#memory_int_98| |v_ULTIMATE.start_sll_circular_create_~last~0#1.base_16|) 0 (select (select |v_old(#memory_int)_AFTER_CALL_49| |v_ULTIMATE.start_sll_circular_create_~last~0#1.base_16|) 0)))) (<= 4 (select |v_#length_BEFORE_CALL_88| |v_ULTIMATE.start_sll_circular_create_~last~0#1.base_16|)))) (not (= |ULTIMATE.start_sll_circular_append_~new_last~0#1.base| 0)) (exists ((|v_#memory_$Pointer$.offset_125| (Array Int (Array Int Int)))) (= |#memory_$Pointer$.offset| (store |v_#memory_$Pointer$.offset_125| |ULTIMATE.start_sll_circular_append_~new_last~0#1.base| (store (store (select |v_#memory_$Pointer$.offset_125| |ULTIMATE.start_sll_circular_append_~new_last~0#1.base|) 0 0) 4 (select (select |#memory_$Pointer$.offset| |ULTIMATE.start_sll_circular_append_~new_last~0#1.base|) 4))))) (= |ULTIMATE.start_sll_circular_append_#in~head#1.base| |ULTIMATE.start_main_~#s~0#1.base|) (<= (+ |ULTIMATE.start_sll_circular_append_~new_last~0#1.base| 1) |#StackHeapBarrier|))) (= |ULTIMATE.start_sll_circular_append_~head#1.offset| 0) (<= 4 (select |#length| |ULTIMATE.start_sll_circular_append_~head#1.base|)) (or (not (= (select (select |#memory_$Pointer$.offset| |ULTIMATE.start_sll_circular_append_~head#1.base|) 0) 0)) (not (= (select (select |#memory_$Pointer$.base| |ULTIMATE.start_sll_circular_append_~head#1.base|) 0) 0))) (= |ULTIMATE.start_sll_circular_append_~new_last~0#1.offset| 0) (= |ULTIMATE.start_sll_circular_append_~last~1#1.base| (select (select |#memory_$Pointer$.base| |ULTIMATE.start_sll_circular_append_~head#1.base|) 0)) (= |ULTIMATE.start_main_~data~0#1| 1) (= |ULTIMATE.start_main_~#s~0#1.offset| 0) (= |ULTIMATE.start_main_~len~0#1| 2) (= (select |#valid| |ULTIMATE.start_sll_circular_append_~head#1.base|) 1) (<= 2 |ULTIMATE.start_main_~#s~0#1.base|) (= |ULTIMATE.start_sll_circular_append_#in~data#1| 5))' at error location [2023-11-23 21:30:20,203 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-23 21:30:20,203 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-11-23 21:30:20,203 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14] total 23 [2023-11-23 21:30:20,203 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1195733785] [2023-11-23 21:30:20,203 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-11-23 21:30:20,204 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 24 states [2023-11-23 21:30:20,204 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:30:20,204 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 24 interpolants. [2023-11-23 21:30:20,206 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=135, Invalid=1589, Unknown=2, NotChecked=80, Total=1806 [2023-11-23 21:30:20,206 INFO L87 Difference]: Start difference. First operand 90 states and 100 transitions. Second operand has 24 states, 18 states have (on average 2.2222222222222223) internal successors, (40), 21 states have internal predecessors, (40), 4 states have call successors, (6), 2 states have call predecessors, (6), 4 states have return successors, (6), 6 states have call predecessors, (6), 4 states have call successors, (6) [2023-11-23 21:30:21,143 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:30:21,143 INFO L93 Difference]: Finished difference Result 93 states and 104 transitions. [2023-11-23 21:30:21,143 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 15 states. [2023-11-23 21:30:21,143 INFO L78 Accepts]: Start accepts. Automaton has has 24 states, 18 states have (on average 2.2222222222222223) internal successors, (40), 21 states have internal predecessors, (40), 4 states have call successors, (6), 2 states have call predecessors, (6), 4 states have return successors, (6), 6 states have call predecessors, (6), 4 states have call successors, (6) Word has length 30 [2023-11-23 21:30:21,144 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:30:21,144 INFO L225 Difference]: With dead ends: 93 [2023-11-23 21:30:21,145 INFO L226 Difference]: Without dead ends: 93 [2023-11-23 21:30:21,146 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 87 GetRequests, 38 SyntacticMatches, 0 SemanticMatches, 49 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 637 ImplicationChecksByTransitivity, 7.4s TimeCoverageRelationStatistics Valid=200, Invalid=2252, Unknown=2, NotChecked=96, Total=2550 [2023-11-23 21:30:21,147 INFO L413 NwaCegarLoop]: 55 mSDtfsCounter, 151 mSDsluCounter, 465 mSDsCounter, 0 mSdLazyCounter, 845 mSolverCounterSat, 18 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 151 SdHoareTripleChecker+Valid, 520 SdHoareTripleChecker+Invalid, 966 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 18 IncrementalHoareTripleChecker+Valid, 845 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 103 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2023-11-23 21:30:21,147 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [151 Valid, 520 Invalid, 966 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [18 Valid, 845 Invalid, 0 Unknown, 103 Unchecked, 0.6s Time] [2023-11-23 21:30:21,148 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 93 states. [2023-11-23 21:30:21,150 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 93 to 89. [2023-11-23 21:30:21,150 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 89 states, 55 states have (on average 1.709090909090909) internal successors, (94), 84 states have internal predecessors, (94), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-11-23 21:30:21,150 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 89 states to 89 states and 100 transitions. [2023-11-23 21:30:21,151 INFO L78 Accepts]: Start accepts. Automaton has 89 states and 100 transitions. Word has length 30 [2023-11-23 21:30:21,151 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:30:21,151 INFO L495 AbstractCegarLoop]: Abstraction has 89 states and 100 transitions. [2023-11-23 21:30:21,151 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 24 states, 18 states have (on average 2.2222222222222223) internal successors, (40), 21 states have internal predecessors, (40), 4 states have call successors, (6), 2 states have call predecessors, (6), 4 states have return successors, (6), 6 states have call predecessors, (6), 4 states have call successors, (6) [2023-11-23 21:30:21,151 INFO L276 IsEmpty]: Start isEmpty. Operand 89 states and 100 transitions. [2023-11-23 21:30:21,152 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 31 [2023-11-23 21:30:21,152 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:30:21,152 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:30:21,176 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a6fde7e3-802d-4241-9771-2470dd320a15/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2023-11-23 21:30:21,371 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable11,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a6fde7e3-802d-4241-9771-2470dd320a15/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:30:21,371 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr13REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 55 more)] === [2023-11-23 21:30:21,372 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:30:21,372 INFO L85 PathProgramCache]: Analyzing trace with hash 1745280877, now seen corresponding path program 1 times [2023-11-23 21:30:21,372 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:30:21,372 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [283058435] [2023-11-23 21:30:21,372 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:30:21,372 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:30:21,400 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:30:22,396 INFO L134 CoverageAnalysis]: Checked inductivity of 16 backedges. 11 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-23 21:30:22,397 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:30:22,397 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [283058435] [2023-11-23 21:30:22,397 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [283058435] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:30:22,397 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [713770409] [2023-11-23 21:30:22,397 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:30:22,397 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:30:22,397 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a6fde7e3-802d-4241-9771-2470dd320a15/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:30:22,402 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a6fde7e3-802d-4241-9771-2470dd320a15/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:30:22,418 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_a6fde7e3-802d-4241-9771-2470dd320a15/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2023-11-23 21:30:22,642 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:30:22,645 INFO L262 TraceCheckSpWp]: Trace formula consists of 339 conjuncts, 60 conjunts are in the unsatisfiable core [2023-11-23 21:30:22,653 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 21:30:22,914 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 9 treesize of output 5 [2023-11-23 21:30:22,920 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 7 treesize of output 3 [2023-11-23 21:30:37,608 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-23 21:30:37,609 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 11 [2023-11-23 21:30:37,802 INFO L349 Elim1Store]: treesize reduction 21, result has 44.7 percent of original size [2023-11-23 21:30:37,802 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 18 treesize of output 21 [2023-11-23 21:30:37,832 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-23 21:30:37,833 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 26 treesize of output 19