./Ultimate.py --spec ../../sv-benchmarks/c/properties/valid-memsafety.prp --file ../../sv-benchmarks/c/list-simple/sll2c_update_all_reverse.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for memory safety (deref-memtrack) Using default analysis Version 30e01a73 Calling Ultimate with: /usr/lib/jvm/java-1.11.0-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_61dce4de-4f0f-4acb-84dd-675f78202d03/bin/utaipan-verify-mE87zJ7Ire/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_61dce4de-4f0f-4acb-84dd-675f78202d03/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_61dce4de-4f0f-4acb-84dd-675f78202d03/bin/utaipan-verify-mE87zJ7Ire/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_61dce4de-4f0f-4acb-84dd-675f78202d03/bin/utaipan-verify-mE87zJ7Ire/config/TaipanMemDerefMemtrack.xml -i ../../sv-benchmarks/c/list-simple/sll2c_update_all_reverse.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_61dce4de-4f0f-4acb-84dd-675f78202d03/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_61dce4de-4f0f-4acb-84dd-675f78202d03/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 4fecbd384f63aa34e01807a3a6735a322a2435f1312f0df3ed763fde7f43fe0a --- Real Ultimate output --- This is Ultimate 0.2.3-dev-30e01a7 [2023-11-23 20:37:37,375 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-11-23 20:37:37,487 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_61dce4de-4f0f-4acb-84dd-675f78202d03/bin/utaipan-verify-mE87zJ7Ire/config/svcomp-DerefFreeMemtrack-32bit-Taipan_Default.epf [2023-11-23 20:37:37,497 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-11-23 20:37:37,501 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-11-23 20:37:37,541 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-11-23 20:37:37,545 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-11-23 20:37:37,545 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-11-23 20:37:37,546 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-11-23 20:37:37,547 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-11-23 20:37:37,548 INFO L153 SettingsManager]: * User list type=DISABLED [2023-11-23 20:37:37,548 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-11-23 20:37:37,549 INFO L153 SettingsManager]: * Explicit value domain=true [2023-11-23 20:37:37,550 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-11-23 20:37:37,550 INFO L153 SettingsManager]: * Octagon Domain=false [2023-11-23 20:37:37,551 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-11-23 20:37:37,551 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-11-23 20:37:37,552 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-11-23 20:37:37,552 INFO L153 SettingsManager]: * Interval Domain=false [2023-11-23 20:37:37,553 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-11-23 20:37:37,553 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-11-23 20:37:37,554 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2023-11-23 20:37:37,555 INFO L151 SettingsManager]: Preferences of BlockEncodingV2 differ from their defaults: [2023-11-23 20:37:37,556 INFO L153 SettingsManager]: * Create parallel compositions if possible=false [2023-11-23 20:37:37,556 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-11-23 20:37:37,557 INFO L153 SettingsManager]: * sizeof long=4 [2023-11-23 20:37:37,557 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-11-23 20:37:37,557 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-11-23 20:37:37,558 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-11-23 20:37:37,558 INFO L153 SettingsManager]: * Check for the main procedure if all allocated memory was freed=true [2023-11-23 20:37:37,559 INFO L153 SettingsManager]: * Bitprecise bitfields=true [2023-11-23 20:37:37,559 INFO L153 SettingsManager]: * SV-COMP memtrack compatibility mode=true [2023-11-23 20:37:37,560 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-11-23 20:37:37,560 INFO L153 SettingsManager]: * Adapt memory model on pointer casts if necessary=true [2023-11-23 20:37:37,560 INFO L153 SettingsManager]: * Check unreachability of reach_error function=false [2023-11-23 20:37:37,560 INFO L153 SettingsManager]: * sizeof long double=12 [2023-11-23 20:37:37,561 INFO L153 SettingsManager]: * Use constant arrays=true [2023-11-23 20:37:37,561 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-11-23 20:37:37,561 INFO L153 SettingsManager]: * Only consider context switches at boundaries of atomic blocks=true [2023-11-23 20:37:37,561 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-11-23 20:37:37,562 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-23 20:37:37,562 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-11-23 20:37:37,562 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-11-23 20:37:37,563 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-11-23 20:37:37,563 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-11-23 20:37:37,563 INFO L153 SettingsManager]: * Apply one-shot large block encoding in concurrent analysis=false [2023-11-23 20:37:37,563 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-11-23 20:37:37,564 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-11-23 20:37:37,564 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_61dce4de-4f0f-4acb-84dd-675f78202d03/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_61dce4de-4f0f-4acb-84dd-675f78202d03/bin/utaipan-verify-mE87zJ7Ire Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G valid-free) ) CHECK( init(main()), LTL(G valid-deref) ) CHECK( init(main()), LTL(G valid-memtrack) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 4fecbd384f63aa34e01807a3a6735a322a2435f1312f0df3ed763fde7f43fe0a [2023-11-23 20:37:37,935 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-11-23 20:37:37,969 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-11-23 20:37:37,973 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-11-23 20:37:37,974 INFO L270 PluginConnector]: Initializing CDTParser... [2023-11-23 20:37:37,975 INFO L274 PluginConnector]: CDTParser initialized [2023-11-23 20:37:37,976 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_61dce4de-4f0f-4acb-84dd-675f78202d03/bin/utaipan-verify-mE87zJ7Ire/../../sv-benchmarks/c/list-simple/sll2c_update_all_reverse.i [2023-11-23 20:37:41,191 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-11-23 20:37:41,515 INFO L384 CDTParser]: Found 1 translation units. [2023-11-23 20:37:41,516 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_61dce4de-4f0f-4acb-84dd-675f78202d03/sv-benchmarks/c/list-simple/sll2c_update_all_reverse.i [2023-11-23 20:37:41,533 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_61dce4de-4f0f-4acb-84dd-675f78202d03/bin/utaipan-verify-mE87zJ7Ire/data/dcdbec1ee/bea182bd7fee4e879d5a29c0d172251f/FLAGdceb7e2dc [2023-11-23 20:37:41,555 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_61dce4de-4f0f-4acb-84dd-675f78202d03/bin/utaipan-verify-mE87zJ7Ire/data/dcdbec1ee/bea182bd7fee4e879d5a29c0d172251f [2023-11-23 20:37:41,558 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-11-23 20:37:41,566 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-11-23 20:37:41,568 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-11-23 20:37:41,578 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-11-23 20:37:41,584 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-11-23 20:37:41,585 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 08:37:41" (1/1) ... [2023-11-23 20:37:41,587 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@475b28f0 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:37:41, skipping insertion in model container [2023-11-23 20:37:41,587 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 08:37:41" (1/1) ... [2023-11-23 20:37:41,655 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-11-23 20:37:42,095 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-23 20:37:42,111 INFO L202 MainTranslator]: Completed pre-run [2023-11-23 20:37:42,179 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-23 20:37:42,214 INFO L206 MainTranslator]: Completed translation [2023-11-23 20:37:42,214 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:37:42 WrapperNode [2023-11-23 20:37:42,215 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-11-23 20:37:42,216 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-11-23 20:37:42,216 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-11-23 20:37:42,217 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-11-23 20:37:42,225 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:37:42" (1/1) ... [2023-11-23 20:37:42,262 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:37:42" (1/1) ... [2023-11-23 20:37:42,304 INFO L138 Inliner]: procedures = 126, calls = 27, calls flagged for inlining = 8, calls inlined = 8, statements flattened = 140 [2023-11-23 20:37:42,305 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-11-23 20:37:42,306 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-11-23 20:37:42,306 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-11-23 20:37:42,306 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-11-23 20:37:42,317 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:37:42" (1/1) ... [2023-11-23 20:37:42,317 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:37:42" (1/1) ... [2023-11-23 20:37:42,339 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:37:42" (1/1) ... [2023-11-23 20:37:42,339 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:37:42" (1/1) ... [2023-11-23 20:37:42,348 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:37:42" (1/1) ... [2023-11-23 20:37:42,363 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:37:42" (1/1) ... [2023-11-23 20:37:42,369 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:37:42" (1/1) ... [2023-11-23 20:37:42,371 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:37:42" (1/1) ... [2023-11-23 20:37:42,384 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-11-23 20:37:42,385 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-11-23 20:37:42,385 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-11-23 20:37:42,386 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-11-23 20:37:42,386 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:37:42" (1/1) ... [2023-11-23 20:37:42,399 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-23 20:37:42,415 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_61dce4de-4f0f-4acb-84dd-675f78202d03/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 20:37:42,432 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_61dce4de-4f0f-4acb-84dd-675f78202d03/bin/utaipan-verify-mE87zJ7Ire/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-11-23 20:37:42,455 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_61dce4de-4f0f-4acb-84dd-675f78202d03/bin/utaipan-verify-mE87zJ7Ire/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-11-23 20:37:42,480 INFO L130 BoogieDeclarations]: Found specification of procedure read~int [2023-11-23 20:37:42,480 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-11-23 20:37:42,480 INFO L130 BoogieDeclarations]: Found specification of procedure node_create [2023-11-23 20:37:42,480 INFO L138 BoogieDeclarations]: Found implementation of procedure node_create [2023-11-23 20:37:42,481 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2023-11-23 20:37:42,481 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-11-23 20:37:42,483 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2023-11-23 20:37:42,483 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2023-11-23 20:37:42,484 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-11-23 20:37:42,484 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-11-23 20:37:42,485 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-11-23 20:37:42,485 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-11-23 20:37:42,609 INFO L241 CfgBuilder]: Building ICFG [2023-11-23 20:37:42,611 INFO L267 CfgBuilder]: Building CFG for each procedure with an implementation [2023-11-23 20:37:42,992 INFO L282 CfgBuilder]: Performing block encoding [2023-11-23 20:37:43,125 INFO L304 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-11-23 20:37:43,126 INFO L309 CfgBuilder]: Removed 6 assume(true) statements. [2023-11-23 20:37:43,128 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 08:37:43 BoogieIcfgContainer [2023-11-23 20:37:43,128 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-11-23 20:37:43,132 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-11-23 20:37:43,132 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-11-23 20:37:43,137 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-11-23 20:37:43,137 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.11 08:37:41" (1/3) ... [2023-11-23 20:37:43,139 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5ac657ce and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 08:37:43, skipping insertion in model container [2023-11-23 20:37:43,139 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 08:37:42" (2/3) ... [2023-11-23 20:37:43,140 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5ac657ce and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 08:37:43, skipping insertion in model container [2023-11-23 20:37:43,140 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 08:37:43" (3/3) ... [2023-11-23 20:37:43,142 INFO L112 eAbstractionObserver]: Analyzing ICFG sll2c_update_all_reverse.i [2023-11-23 20:37:43,168 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:false NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-11-23 20:37:43,169 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 28 error locations. [2023-11-23 20:37:43,237 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-11-23 20:37:43,245 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;@44c24835, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-11-23 20:37:43,246 INFO L358 AbstractCegarLoop]: Starting to check reachability of 28 error locations. [2023-11-23 20:37:43,251 INFO L276 IsEmpty]: Start isEmpty. Operand has 67 states, 35 states have (on average 2.085714285714286) internal successors, (73), 63 states have internal predecessors, (73), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-11-23 20:37:43,258 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2023-11-23 20:37:43,259 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 20:37:43,260 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1] [2023-11-23 20:37:43,260 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting node_createErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 25 more)] === [2023-11-23 20:37:43,266 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 20:37:43,267 INFO L85 PathProgramCache]: Analyzing trace with hash 209499439, now seen corresponding path program 1 times [2023-11-23 20:37:43,279 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 20:37:43,279 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [336936644] [2023-11-23 20:37:43,280 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:37:43,281 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 20:37:43,413 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:37:43,553 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 20:37:43,554 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 20:37:43,554 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [336936644] [2023-11-23 20:37:43,555 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [336936644] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 20:37:43,556 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-23 20:37:43,556 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-11-23 20:37:43,558 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1923290592] [2023-11-23 20:37:43,559 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 20:37:43,565 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-23 20:37:43,566 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 20:37:43,605 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-23 20:37:43,606 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-23 20:37:43,609 INFO L87 Difference]: Start difference. First operand has 67 states, 35 states have (on average 2.085714285714286) internal successors, (73), 63 states have internal predecessors, (73), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Second operand has 3 states, 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 20:37:43,769 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 20:37:43,769 INFO L93 Difference]: Finished difference Result 64 states and 72 transitions. [2023-11-23 20:37:43,772 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-23 20:37:43,774 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 20:37:43,774 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 20:37:43,786 INFO L225 Difference]: With dead ends: 64 [2023-11-23 20:37:43,786 INFO L226 Difference]: Without dead ends: 62 [2023-11-23 20:37:43,791 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 20:37:43,799 INFO L413 NwaCegarLoop]: 48 mSDtfsCounter, 6 mSDsluCounter, 31 mSDsCounter, 0 mSdLazyCounter, 57 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 6 SdHoareTripleChecker+Valid, 79 SdHoareTripleChecker+Invalid, 58 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 57 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-23 20:37:43,800 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [6 Valid, 79 Invalid, 58 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 57 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-23 20:37:43,821 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 62 states. [2023-11-23 20:37:43,845 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 62 to 62. [2023-11-23 20:37:43,847 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 62 states, 33 states have (on average 1.9696969696969697) internal successors, (65), 58 states have internal predecessors, (65), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-11-23 20:37:43,849 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 62 states to 62 states and 69 transitions. [2023-11-23 20:37:43,851 INFO L78 Accepts]: Start accepts. Automaton has 62 states and 69 transitions. Word has length 5 [2023-11-23 20:37:43,851 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 20:37:43,851 INFO L495 AbstractCegarLoop]: Abstraction has 62 states and 69 transitions. [2023-11-23 20:37:43,852 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 20:37:43,852 INFO L276 IsEmpty]: Start isEmpty. Operand 62 states and 69 transitions. [2023-11-23 20:37:43,852 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2023-11-23 20:37:43,853 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 20:37:43,853 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1] [2023-11-23 20:37:43,853 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-11-23 20:37:43,854 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting node_createErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 25 more)] === [2023-11-23 20:37:43,855 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 20:37:43,855 INFO L85 PathProgramCache]: Analyzing trace with hash 209499440, now seen corresponding path program 1 times [2023-11-23 20:37:43,855 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 20:37:43,856 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [569030209] [2023-11-23 20:37:43,856 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:37:43,856 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 20:37:43,882 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:37:44,001 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 20:37:44,002 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 20:37:44,002 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [569030209] [2023-11-23 20:37:44,002 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [569030209] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 20:37:44,003 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-23 20:37:44,003 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-11-23 20:37:44,003 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [920394385] [2023-11-23 20:37:44,003 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 20:37:44,005 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-23 20:37:44,005 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 20:37:44,006 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-23 20:37:44,006 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-23 20:37:44,007 INFO L87 Difference]: Start difference. First operand 62 states and 69 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 20:37:44,100 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 20:37:44,100 INFO L93 Difference]: Finished difference Result 60 states and 67 transitions. [2023-11-23 20:37:44,101 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-23 20:37:44,101 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 20:37:44,101 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 20:37:44,103 INFO L225 Difference]: With dead ends: 60 [2023-11-23 20:37:44,103 INFO L226 Difference]: Without dead ends: 60 [2023-11-23 20:37:44,103 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 20:37:44,106 INFO L413 NwaCegarLoop]: 47 mSDtfsCounter, 2 mSDsluCounter, 36 mSDsCounter, 0 mSdLazyCounter, 47 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 83 SdHoareTripleChecker+Invalid, 48 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 47 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-23 20:37:44,107 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [2 Valid, 83 Invalid, 48 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 47 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-23 20:37:44,108 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2023-11-23 20:37:44,114 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 60. [2023-11-23 20:37:44,115 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 60 states, 33 states have (on average 1.9090909090909092) internal successors, (63), 56 states have internal predecessors, (63), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-11-23 20:37:44,117 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 67 transitions. [2023-11-23 20:37:44,117 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 67 transitions. Word has length 5 [2023-11-23 20:37:44,118 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 20:37:44,118 INFO L495 AbstractCegarLoop]: Abstraction has 60 states and 67 transitions. [2023-11-23 20:37:44,118 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 20:37:44,118 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 67 transitions. [2023-11-23 20:37:44,119 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2023-11-23 20:37:44,119 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 20:37:44,120 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 20:37:44,120 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1 [2023-11-23 20:37:44,120 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 25 more)] === [2023-11-23 20:37:44,121 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 20:37:44,121 INFO L85 PathProgramCache]: Analyzing trace with hash -1748634853, now seen corresponding path program 1 times [2023-11-23 20:37:44,121 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 20:37:44,122 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1372628990] [2023-11-23 20:37:44,122 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:37:44,122 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 20:37:44,150 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:37:44,308 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 20:37:44,309 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 20:37:44,310 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1372628990] [2023-11-23 20:37:44,310 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1372628990] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 20:37:44,310 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-23 20:37:44,311 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [3] imperfect sequences [] total 3 [2023-11-23 20:37:44,311 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [764642353] [2023-11-23 20:37:44,313 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 20:37:44,314 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-23 20:37:44,314 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 20:37:44,316 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-23 20:37:44,317 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-23 20:37:44,318 INFO L87 Difference]: Start difference. First operand 60 states and 67 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 20:37:44,391 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 20:37:44,392 INFO L93 Difference]: Finished difference Result 66 states and 74 transitions. [2023-11-23 20:37:44,392 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-23 20:37:44,392 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 20:37:44,393 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 20:37:44,394 INFO L225 Difference]: With dead ends: 66 [2023-11-23 20:37:44,394 INFO L226 Difference]: Without dead ends: 66 [2023-11-23 20:37:44,394 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 20:37:44,396 INFO L413 NwaCegarLoop]: 48 mSDtfsCounter, 4 mSDsluCounter, 46 mSDsCounter, 0 mSdLazyCounter, 37 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 94 SdHoareTripleChecker+Invalid, 37 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 37 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-23 20:37:44,397 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [5 Valid, 94 Invalid, 37 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 37 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-23 20:37:44,398 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2023-11-23 20:37:44,407 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 61. [2023-11-23 20:37:44,407 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 61 states, 34 states have (on average 1.8823529411764706) internal successors, (64), 57 states have internal predecessors, (64), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-11-23 20:37:44,409 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 61 states to 61 states and 68 transitions. [2023-11-23 20:37:44,409 INFO L78 Accepts]: Start accepts. Automaton has 61 states and 68 transitions. Word has length 10 [2023-11-23 20:37:44,410 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 20:37:44,410 INFO L495 AbstractCegarLoop]: Abstraction has 61 states and 68 transitions. [2023-11-23 20:37:44,410 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 20:37:44,410 INFO L276 IsEmpty]: Start isEmpty. Operand 61 states and 68 transitions. [2023-11-23 20:37:44,411 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2023-11-23 20:37:44,411 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 20:37:44,412 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 20:37:44,412 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2 [2023-11-23 20:37:44,412 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 25 more)] === [2023-11-23 20:37:44,413 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 20:37:44,413 INFO L85 PathProgramCache]: Analyzing trace with hash 420391556, now seen corresponding path program 1 times [2023-11-23 20:37:44,413 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 20:37:44,414 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1962691156] [2023-11-23 20:37:44,414 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:37:44,414 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 20:37:44,461 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:37:44,614 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 20:37:44,615 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 20:37:44,615 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1962691156] [2023-11-23 20:37:44,615 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1962691156] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 20:37:44,615 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-23 20:37:44,616 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2023-11-23 20:37:44,616 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [243172867] [2023-11-23 20:37:44,616 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 20:37:44,617 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-11-23 20:37:44,617 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 20:37:44,618 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-11-23 20:37:44,618 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-11-23 20:37:44,619 INFO L87 Difference]: Start difference. First operand 61 states and 68 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 20:37:44,799 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 20:37:44,799 INFO L93 Difference]: Finished difference Result 60 states and 67 transitions. [2023-11-23 20:37:44,799 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-11-23 20:37:44,800 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 20:37:44,800 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 20:37:44,801 INFO L225 Difference]: With dead ends: 60 [2023-11-23 20:37:44,801 INFO L226 Difference]: Without dead ends: 60 [2023-11-23 20:37:44,802 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 20:37:44,803 INFO L413 NwaCegarLoop]: 44 mSDtfsCounter, 3 mSDsluCounter, 116 mSDsCounter, 0 mSdLazyCounter, 162 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 160 SdHoareTripleChecker+Invalid, 163 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 162 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-23 20:37:44,804 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [3 Valid, 160 Invalid, 163 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 162 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-23 20:37:44,805 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 60 states. [2023-11-23 20:37:44,810 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 60 to 60. [2023-11-23 20:37:44,811 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 60 states, 34 states have (on average 1.8529411764705883) internal successors, (63), 56 states have internal predecessors, (63), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-11-23 20:37:44,812 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 67 transitions. [2023-11-23 20:37:44,812 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 67 transitions. Word has length 17 [2023-11-23 20:37:44,813 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 20:37:44,813 INFO L495 AbstractCegarLoop]: Abstraction has 60 states and 67 transitions. [2023-11-23 20:37:44,813 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 20:37:44,814 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 67 transitions. [2023-11-23 20:37:44,817 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2023-11-23 20:37:44,817 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 20:37:44,817 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 20:37:44,818 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3 [2023-11-23 20:37:44,819 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 25 more)] === [2023-11-23 20:37:44,819 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 20:37:44,819 INFO L85 PathProgramCache]: Analyzing trace with hash 420391557, now seen corresponding path program 1 times [2023-11-23 20:37:44,820 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 20:37:44,820 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1897837000] [2023-11-23 20:37:44,820 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:37:44,820 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 20:37:44,883 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:37:45,408 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 20:37:45,408 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 20:37:45,410 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1897837000] [2023-11-23 20:37:45,410 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1897837000] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 20:37:45,410 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-23 20:37:45,411 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2023-11-23 20:37:45,411 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [320896322] [2023-11-23 20:37:45,412 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 20:37:45,414 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-11-23 20:37:45,414 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 20:37:45,416 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-11-23 20:37:45,416 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=9, Invalid=21, Unknown=0, NotChecked=0, Total=30 [2023-11-23 20:37:45,416 INFO L87 Difference]: Start difference. First operand 60 states and 67 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 20:37:45,569 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 20:37:45,570 INFO L93 Difference]: Finished difference Result 59 states and 66 transitions. [2023-11-23 20:37:45,570 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-11-23 20:37:45,570 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 20:37:45,571 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 20:37:45,572 INFO L225 Difference]: With dead ends: 59 [2023-11-23 20:37:45,572 INFO L226 Difference]: Without dead ends: 59 [2023-11-23 20:37:45,572 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=13, Invalid=29, Unknown=0, NotChecked=0, Total=42 [2023-11-23 20:37:45,578 INFO L413 NwaCegarLoop]: 44 mSDtfsCounter, 1 mSDsluCounter, 136 mSDsCounter, 0 mSdLazyCounter, 138 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 180 SdHoareTripleChecker+Invalid, 138 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 138 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-23 20:37:45,578 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [1 Valid, 180 Invalid, 138 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 138 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-23 20:37:45,582 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 59 states. [2023-11-23 20:37:45,593 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 59 to 59. [2023-11-23 20:37:45,596 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 59 states, 34 states have (on average 1.8235294117647058) internal successors, (62), 55 states have internal predecessors, (62), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-11-23 20:37:45,598 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 59 states to 59 states and 66 transitions. [2023-11-23 20:37:45,601 INFO L78 Accepts]: Start accepts. Automaton has 59 states and 66 transitions. Word has length 17 [2023-11-23 20:37:45,601 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 20:37:45,601 INFO L495 AbstractCegarLoop]: Abstraction has 59 states and 66 transitions. [2023-11-23 20:37:45,602 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 20:37:45,602 INFO L276 IsEmpty]: Start isEmpty. Operand 59 states and 66 transitions. [2023-11-23 20:37:45,602 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2023-11-23 20:37:45,604 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 20:37:45,604 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 20:37:45,604 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4 [2023-11-23 20:37:45,605 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 25 more)] === [2023-11-23 20:37:45,606 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 20:37:45,606 INFO L85 PathProgramCache]: Analyzing trace with hash 269535751, now seen corresponding path program 1 times [2023-11-23 20:37:45,606 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 20:37:45,607 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [822431628] [2023-11-23 20:37:45,608 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:37:45,608 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 20:37:45,665 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:37:46,004 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 20:37:46,004 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 20:37:46,005 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [822431628] [2023-11-23 20:37:46,006 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [822431628] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 20:37:46,006 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [812787172] [2023-11-23 20:37:46,006 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:37:46,007 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 20:37:46,008 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_61dce4de-4f0f-4acb-84dd-675f78202d03/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 20:37:46,010 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_61dce4de-4f0f-4acb-84dd-675f78202d03/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 20:37:46,038 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_61dce4de-4f0f-4acb-84dd-675f78202d03/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-11-23 20:37:46,161 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:37:46,165 INFO L262 TraceCheckSpWp]: Trace formula consists of 201 conjuncts, 17 conjunts are in the unsatisfiable core [2023-11-23 20:37:46,178 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 20:37:46,246 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 20:37:46,314 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 20:37:46,400 INFO L349 Elim1Store]: treesize reduction 20, result has 33.3 percent of original size [2023-11-23 20:37:46,400 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 20:37:46,417 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 20:37:46,423 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-23 20:37:46,514 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [812787172] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 20:37:46,514 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [426223048] [2023-11-23 20:37:46,541 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-11-23 20:37:46,541 INFO L166 IcfgInterpreter]: Building call graph [2023-11-23 20:37:46,547 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-23 20:37:46,554 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-23 20:37:46,555 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-23 20:37:48,072 INFO L197 IcfgInterpreter]: Interpreting procedure node_create with input of size 43 for LOIs [2023-11-23 20:37:48,217 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-23 20:37:50,103 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '787#(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_~len~0#1| 2) (= 2 |ULTIMATE.start_sll_circular_create_#in~len#1|) (= |ULTIMATE.start_sll_circular_create_~data#1| 1))' at error location [2023-11-23 20:37:50,104 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-23 20:37:50,104 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-11-23 20:37:50,104 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 7] total 10 [2023-11-23 20:37:50,104 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1327763356] [2023-11-23 20:37:50,104 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-11-23 20:37:50,105 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 11 states [2023-11-23 20:37:50,105 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 20:37:50,105 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 11 interpolants. [2023-11-23 20:37:50,106 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=76, Invalid=433, Unknown=1, NotChecked=42, Total=552 [2023-11-23 20:37:50,106 INFO L87 Difference]: Start difference. First operand 59 states and 66 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 20:37:50,377 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 20:37:50,377 INFO L93 Difference]: Finished difference Result 58 states and 65 transitions. [2023-11-23 20:37:50,378 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-11-23 20:37:50,378 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 20:37:50,379 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 20:37:50,379 INFO L225 Difference]: With dead ends: 58 [2023-11-23 20:37:50,380 INFO L226 Difference]: Without dead ends: 58 [2023-11-23 20:37:50,380 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 54 GetRequests, 30 SyntacticMatches, 0 SemanticMatches, 24 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 105 ImplicationChecksByTransitivity, 2.1s TimeCoverageRelationStatistics Valid=94, Invalid=509, Unknown=1, NotChecked=46, Total=650 [2023-11-23 20:37:50,381 INFO L413 NwaCegarLoop]: 40 mSDtfsCounter, 5 mSDsluCounter, 158 mSDsCounter, 0 mSdLazyCounter, 229 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 198 SdHoareTripleChecker+Invalid, 293 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 229 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 60 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-23 20:37:50,382 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [5 Valid, 198 Invalid, 293 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 229 Invalid, 0 Unknown, 60 Unchecked, 0.2s Time] [2023-11-23 20:37:50,383 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2023-11-23 20:37:50,386 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 58. [2023-11-23 20:37:50,386 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 58 states, 34 states have (on average 1.7941176470588236) internal successors, (61), 54 states have internal predecessors, (61), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-11-23 20:37:50,387 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 58 states to 58 states and 65 transitions. [2023-11-23 20:37:50,387 INFO L78 Accepts]: Start accepts. Automaton has 58 states and 65 transitions. Word has length 19 [2023-11-23 20:37:50,388 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 20:37:50,388 INFO L495 AbstractCegarLoop]: Abstraction has 58 states and 65 transitions. [2023-11-23 20:37:50,388 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 20:37:50,389 INFO L276 IsEmpty]: Start isEmpty. Operand 58 states and 65 transitions. [2023-11-23 20:37:50,389 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2023-11-23 20:37:50,389 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 20:37:50,390 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 20:37:50,414 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_61dce4de-4f0f-4acb-84dd-675f78202d03/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Ended with exit code 0 [2023-11-23 20:37:50,590 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_61dce4de-4f0f-4acb-84dd-675f78202d03/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 20:37:50,591 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr3REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 25 more)] === [2023-11-23 20:37:50,591 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 20:37:50,591 INFO L85 PathProgramCache]: Analyzing trace with hash 269535752, now seen corresponding path program 1 times [2023-11-23 20:37:50,591 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 20:37:50,591 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1618424534] [2023-11-23 20:37:50,591 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:37:50,592 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 20:37:50,621 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:37:51,011 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-23 20:37:51,012 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 20:37:51,012 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1618424534] [2023-11-23 20:37:51,012 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1618424534] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 20:37:51,012 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1336625509] [2023-11-23 20:37:51,013 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:37:51,013 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 20:37:51,013 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_61dce4de-4f0f-4acb-84dd-675f78202d03/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 20:37:51,015 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_61dce4de-4f0f-4acb-84dd-675f78202d03/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 20:37:51,027 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_61dce4de-4f0f-4acb-84dd-675f78202d03/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-11-23 20:37:51,145 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:37:51,148 INFO L262 TraceCheckSpWp]: Trace formula consists of 201 conjuncts, 31 conjunts are in the unsatisfiable core [2023-11-23 20:37:51,155 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 20:37:51,169 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 20:37:51,175 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 8 treesize of output 1 [2023-11-23 20:37:51,336 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 20:37:51,372 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-23 20:37:51,373 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 20:37:51,382 INFO L349 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2023-11-23 20:37:51,383 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 20:37:51,423 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 20:37:51,424 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-23 20:37:51,579 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1336625509] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 20:37:51,579 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1613369212] [2023-11-23 20:37:51,585 INFO L159 IcfgInterpreter]: Started Sifa with 14 locations of interest [2023-11-23 20:37:51,585 INFO L166 IcfgInterpreter]: Building call graph [2023-11-23 20:37:51,585 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-23 20:37:51,586 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-23 20:37:51,586 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-23 20:37:52,563 INFO L197 IcfgInterpreter]: Interpreting procedure node_create with input of size 43 for LOIs [2023-11-23 20:37:52,659 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-23 20:37:54,529 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1006#(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) (= |ULTIMATE.start_sll_circular_create_~len#1| 1) (<= (select |#length| |ULTIMATE.start_sll_circular_create_~last~0#1.base|) 3) (= |ULTIMATE.start_main_~data~0#1| 1) (= |ULTIMATE.start_main_~len~0#1| 2) (= 2 |ULTIMATE.start_sll_circular_create_#in~len#1|) (= |ULTIMATE.start_sll_circular_create_~data#1| 1))' at error location [2023-11-23 20:37:54,529 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-23 20:37:54,529 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-11-23 20:37:54,529 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [8, 8] total 15 [2023-11-23 20:37:54,529 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [268550637] [2023-11-23 20:37:54,529 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-11-23 20:37:54,530 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 16 states [2023-11-23 20:37:54,530 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 20:37:54,531 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 16 interpolants. [2023-11-23 20:37:54,531 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=94, Invalid=721, Unknown=1, NotChecked=54, Total=870 [2023-11-23 20:37:54,532 INFO L87 Difference]: Start difference. First operand 58 states and 65 transitions. Second operand has 16 states, 12 states have (on average 2.4166666666666665) internal successors, (29), 12 states have internal predecessors, (29), 3 states have call successors, (3), 3 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 20:37:55,082 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 20:37:55,082 INFO L93 Difference]: Finished difference Result 58 states and 66 transitions. [2023-11-23 20:37:55,083 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2023-11-23 20:37:55,083 INFO L78 Accepts]: Start accepts. Automaton has has 16 states, 12 states have (on average 2.4166666666666665) internal successors, (29), 12 states have internal predecessors, (29), 3 states have call successors, (3), 3 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 20:37:55,083 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 20:37:55,085 INFO L225 Difference]: With dead ends: 58 [2023-11-23 20:37:55,086 INFO L226 Difference]: Without dead ends: 58 [2023-11-23 20:37:55,087 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 55 GetRequests, 23 SyntacticMatches, 0 SemanticMatches, 32 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 153 ImplicationChecksByTransitivity, 2.3s TimeCoverageRelationStatistics Valid=125, Invalid=934, Unknown=1, NotChecked=62, Total=1122 [2023-11-23 20:37:55,088 INFO L413 NwaCegarLoop]: 40 mSDtfsCounter, 3 mSDsluCounter, 304 mSDsCounter, 0 mSdLazyCounter, 385 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 344 SdHoareTripleChecker+Invalid, 449 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 385 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 62 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-11-23 20:37:55,088 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [3 Valid, 344 Invalid, 449 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 385 Invalid, 0 Unknown, 62 Unchecked, 0.4s Time] [2023-11-23 20:37:55,089 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 58 states. [2023-11-23 20:37:55,092 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 58 to 57. [2023-11-23 20:37:55,093 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 57 states, 34 states have (on average 1.7647058823529411) internal successors, (60), 53 states have internal predecessors, (60), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-11-23 20:37:55,093 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 57 states to 57 states and 64 transitions. [2023-11-23 20:37:55,094 INFO L78 Accepts]: Start accepts. Automaton has 57 states and 64 transitions. Word has length 19 [2023-11-23 20:37:55,095 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 20:37:55,095 INFO L495 AbstractCegarLoop]: Abstraction has 57 states and 64 transitions. [2023-11-23 20:37:55,095 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 16 states, 12 states have (on average 2.4166666666666665) internal successors, (29), 12 states have internal predecessors, (29), 3 states have call successors, (3), 3 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 20:37:55,095 INFO L276 IsEmpty]: Start isEmpty. Operand 57 states and 64 transitions. [2023-11-23 20:37:55,096 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2023-11-23 20:37:55,097 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 20:37:55,097 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 20:37:55,123 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_61dce4de-4f0f-4acb-84dd-675f78202d03/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2023-11-23 20:37:55,310 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_61dce4de-4f0f-4acb-84dd-675f78202d03/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 20:37:55,310 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr6REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 25 more)] === [2023-11-23 20:37:55,311 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 20:37:55,311 INFO L85 PathProgramCache]: Analyzing trace with hash -1844388665, now seen corresponding path program 1 times [2023-11-23 20:37:55,311 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 20:37:55,311 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1947700987] [2023-11-23 20:37:55,311 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:37:55,311 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 20:37:55,348 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:37:55,512 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-11-23 20:37:55,513 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 20:37:55,513 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1947700987] [2023-11-23 20:37:55,513 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1947700987] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 20:37:55,513 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-23 20:37:55,513 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [5] imperfect sequences [] total 5 [2023-11-23 20:37:55,514 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [184970255] [2023-11-23 20:37:55,514 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 20:37:55,514 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-11-23 20:37:55,514 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 20:37:55,515 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-11-23 20:37:55,515 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-11-23 20:37:55,515 INFO L87 Difference]: Start difference. First operand 57 states and 64 transitions. Second operand has 5 states, 5 states have (on average 2.8) internal successors, (14), 5 states have internal predecessors, (14), 1 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2023-11-23 20:37:55,626 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 20:37:55,626 INFO L93 Difference]: Finished difference Result 78 states and 87 transitions. [2023-11-23 20:37:55,627 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-11-23 20:37:55,627 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 2.8) internal successors, (14), 5 states have internal predecessors, (14), 1 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 22 [2023-11-23 20:37:55,627 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 20:37:55,628 INFO L225 Difference]: With dead ends: 78 [2023-11-23 20:37:55,628 INFO L226 Difference]: Without dead ends: 78 [2023-11-23 20:37:55,629 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=22, Invalid=34, Unknown=0, NotChecked=0, Total=56 [2023-11-23 20:37:55,630 INFO L413 NwaCegarLoop]: 42 mSDtfsCounter, 98 mSDsluCounter, 88 mSDsCounter, 0 mSdLazyCounter, 60 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 98 SdHoareTripleChecker+Valid, 130 SdHoareTripleChecker+Invalid, 65 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 60 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-23 20:37:55,630 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [98 Valid, 130 Invalid, 65 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 60 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-23 20:37:55,631 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 78 states. [2023-11-23 20:37:55,633 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 78 to 60. [2023-11-23 20:37:55,634 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 60 states, 37 states have (on average 1.7027027027027026) internal successors, (63), 56 states have internal predecessors, (63), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-11-23 20:37:55,635 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 60 states to 60 states and 67 transitions. [2023-11-23 20:37:55,635 INFO L78 Accepts]: Start accepts. Automaton has 60 states and 67 transitions. Word has length 22 [2023-11-23 20:37:55,635 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 20:37:55,635 INFO L495 AbstractCegarLoop]: Abstraction has 60 states and 67 transitions. [2023-11-23 20:37:55,636 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 2.8) internal successors, (14), 5 states have internal predecessors, (14), 1 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2023-11-23 20:37:55,636 INFO L276 IsEmpty]: Start isEmpty. Operand 60 states and 67 transitions. [2023-11-23 20:37:55,636 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2023-11-23 20:37:55,637 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 20:37:55,637 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 20:37:55,637 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7 [2023-11-23 20:37:55,637 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr5REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 25 more)] === [2023-11-23 20:37:55,638 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 20:37:55,638 INFO L85 PathProgramCache]: Analyzing trace with hash -1844393507, now seen corresponding path program 1 times [2023-11-23 20:37:55,638 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 20:37:55,638 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [253780707] [2023-11-23 20:37:55,639 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:37:55,639 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 20:37:55,668 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:37:55,975 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 5 proven. 0 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-23 20:37:55,975 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 20:37:55,976 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [253780707] [2023-11-23 20:37:55,976 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [253780707] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 20:37:55,976 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-23 20:37:55,976 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2023-11-23 20:37:55,976 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1527268468] [2023-11-23 20:37:55,977 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 20:37:55,977 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2023-11-23 20:37:55,977 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 20:37:55,978 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2023-11-23 20:37:55,978 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2023-11-23 20:37:55,978 INFO L87 Difference]: Start difference. First operand 60 states and 67 transitions. Second operand has 9 states, 7 states have (on average 2.5714285714285716) internal successors, (18), 8 states have internal predecessors, (18), 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 20:37:56,263 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 20:37:56,264 INFO L93 Difference]: Finished difference Result 66 states and 75 transitions. [2023-11-23 20:37:56,264 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2023-11-23 20:37:56,264 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 7 states have (on average 2.5714285714285716) internal successors, (18), 8 states have internal predecessors, (18), 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 22 [2023-11-23 20:37:56,265 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 20:37:56,265 INFO L225 Difference]: With dead ends: 66 [2023-11-23 20:37:56,266 INFO L226 Difference]: Without dead ends: 66 [2023-11-23 20:37:56,266 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=23, Invalid=87, Unknown=0, NotChecked=0, Total=110 [2023-11-23 20:37:56,267 INFO L413 NwaCegarLoop]: 36 mSDtfsCounter, 56 mSDsluCounter, 188 mSDsCounter, 0 mSdLazyCounter, 262 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 56 SdHoareTripleChecker+Valid, 224 SdHoareTripleChecker+Invalid, 263 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 262 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-23 20:37:56,267 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [56 Valid, 224 Invalid, 263 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 262 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-23 20:37:56,268 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2023-11-23 20:37:56,271 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 63. [2023-11-23 20:37:56,271 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 63 states, 40 states have (on average 1.725) internal successors, (69), 59 states have internal predecessors, (69), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-11-23 20:37:56,272 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 73 transitions. [2023-11-23 20:37:56,272 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 73 transitions. Word has length 22 [2023-11-23 20:37:56,272 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 20:37:56,272 INFO L495 AbstractCegarLoop]: Abstraction has 63 states and 73 transitions. [2023-11-23 20:37:56,272 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 7 states have (on average 2.5714285714285716) internal successors, (18), 8 states have internal predecessors, (18), 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 20:37:56,273 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 73 transitions. [2023-11-23 20:37:56,273 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2023-11-23 20:37:56,273 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 20:37:56,273 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 20:37:56,274 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable8 [2023-11-23 20:37:56,274 INFO L420 AbstractCegarLoop]: === Iteration 10 === Targeting ULTIMATE.startErr4REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 25 more)] === [2023-11-23 20:37:56,274 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 20:37:56,274 INFO L85 PathProgramCache]: Analyzing trace with hash -1844393508, now seen corresponding path program 1 times [2023-11-23 20:37:56,275 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 20:37:56,275 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1474339618] [2023-11-23 20:37:56,275 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:37:56,275 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 20:37:56,296 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:37:56,453 INFO L134 CoverageAnalysis]: Checked inductivity of 6 backedges. 3 proven. 0 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-11-23 20:37:56,453 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 20:37:56,453 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1474339618] [2023-11-23 20:37:56,453 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1474339618] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 20:37:56,453 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-23 20:37:56,453 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2023-11-23 20:37:56,454 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [400178103] [2023-11-23 20:37:56,454 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 20:37:56,454 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2023-11-23 20:37:56,454 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 20:37:56,455 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2023-11-23 20:37:56,455 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2023-11-23 20:37:56,455 INFO L87 Difference]: Start difference. First operand 63 states and 73 transitions. Second operand has 9 states, 7 states have (on average 2.2857142857142856) internal successors, (16), 8 states have internal predecessors, (16), 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 20:37:56,704 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 20:37:56,704 INFO L93 Difference]: Finished difference Result 83 states and 92 transitions. [2023-11-23 20:37:56,705 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2023-11-23 20:37:56,705 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 7 states have (on average 2.2857142857142856) internal successors, (16), 8 states have internal predecessors, (16), 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 22 [2023-11-23 20:37:56,705 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 20:37:56,706 INFO L225 Difference]: With dead ends: 83 [2023-11-23 20:37:56,706 INFO L226 Difference]: Without dead ends: 83 [2023-11-23 20:37:56,706 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=23, Invalid=87, Unknown=0, NotChecked=0, Total=110 [2023-11-23 20:37:56,707 INFO L413 NwaCegarLoop]: 32 mSDtfsCounter, 52 mSDsluCounter, 174 mSDsCounter, 0 mSdLazyCounter, 293 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.2s Time, 0 mProtectedPredicate, 0 mProtectedAction, 52 SdHoareTripleChecker+Valid, 206 SdHoareTripleChecker+Invalid, 295 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 293 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-23 20:37:56,707 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [52 Valid, 206 Invalid, 295 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 293 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-23 20:37:56,708 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83 states. [2023-11-23 20:37:56,711 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83 to 63. [2023-11-23 20:37:56,711 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 63 states, 40 states have (on average 1.675) internal successors, (67), 59 states have internal predecessors, (67), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-11-23 20:37:56,712 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 63 states to 63 states and 71 transitions. [2023-11-23 20:37:56,712 INFO L78 Accepts]: Start accepts. Automaton has 63 states and 71 transitions. Word has length 22 [2023-11-23 20:37:56,713 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 20:37:56,713 INFO L495 AbstractCegarLoop]: Abstraction has 63 states and 71 transitions. [2023-11-23 20:37:56,713 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 7 states have (on average 2.2857142857142856) internal successors, (16), 8 states have internal predecessors, (16), 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 20:37:56,713 INFO L276 IsEmpty]: Start isEmpty. Operand 63 states and 71 transitions. [2023-11-23 20:37:56,714 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2023-11-23 20:37:56,714 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 20:37:56,714 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 20:37:56,714 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable9 [2023-11-23 20:37:56,715 INFO L420 AbstractCegarLoop]: === Iteration 11 === Targeting ULTIMATE.startErr6REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 25 more)] === [2023-11-23 20:37:56,715 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 20:37:56,715 INFO L85 PathProgramCache]: Analyzing trace with hash 1359470002, now seen corresponding path program 1 times [2023-11-23 20:37:56,715 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 20:37:56,715 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [335846793] [2023-11-23 20:37:56,716 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:37:56,716 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 20:37:56,741 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:37:57,159 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 3 proven. 4 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 20:37:57,160 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 20:37:57,160 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [335846793] [2023-11-23 20:37:57,160 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [335846793] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 20:37:57,160 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1244535808] [2023-11-23 20:37:57,160 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:37:57,160 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 20:37:57,160 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_61dce4de-4f0f-4acb-84dd-675f78202d03/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 20:37:57,161 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_61dce4de-4f0f-4acb-84dd-675f78202d03/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 20:37:57,171 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_61dce4de-4f0f-4acb-84dd-675f78202d03/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-11-23 20:37:57,301 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:37:57,305 INFO L262 TraceCheckSpWp]: Trace formula consists of 258 conjuncts, 51 conjunts are in the unsatisfiable core [2023-11-23 20:37:57,309 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 20:37:57,313 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 20:37:57,365 INFO L349 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2023-11-23 20:37:57,366 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 20:37:57,377 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2023-11-23 20:37:57,425 INFO L349 Elim1Store]: treesize reduction 19, result has 20.8 percent of original size [2023-11-23 20:37:57,426 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 34 treesize of output 33 [2023-11-23 20:37:57,489 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 25 treesize of output 13 [2023-11-23 20:37:57,493 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 1 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 20:37:57,494 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-23 20:37:57,527 INFO L349 Elim1Store]: treesize reduction 5, result has 66.7 percent of original size [2023-11-23 20:37:57,528 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 19 treesize of output 18 [2023-11-23 20:37:57,533 WARN L854 $PredicateComparison]: unable to prove that (forall ((v_ArrVal_425 (Array Int Int))) (= |c_ULTIMATE.start_sll_circular_create_~last~0#1.base| (select (select (store |c_#memory_$Pointer$.base| |c_ULTIMATE.start_sll_circular_create_~last~0#1.base| v_ArrVal_425) |c_ULTIMATE.start_sll_circular_create_~head~0#1.base|) |c_ULTIMATE.start_sll_circular_create_~head~0#1.offset|))) is different from false [2023-11-23 20:37:57,544 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-11-23 20:37:57,544 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 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 19 [2023-11-23 20:37:57,548 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 30 treesize of output 22 [2023-11-23 20:37:57,553 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 20:37:57,627 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1244535808] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 20:37:57,627 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [890942661] [2023-11-23 20:37:57,630 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2023-11-23 20:37:57,631 INFO L166 IcfgInterpreter]: Building call graph [2023-11-23 20:37:57,631 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-23 20:37:57,631 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-23 20:37:57,632 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-23 20:37:58,552 INFO L197 IcfgInterpreter]: Interpreting procedure node_create with input of size 43 for LOIs [2023-11-23 20:37:58,640 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-23 20:38:01,169 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1709#(and (= |ULTIMATE.start_sll_circular_update_at_#in~head#1.offset| 0) (<= 1 |#StackHeapBarrier|) (= |ULTIMATE.start_sll_circular_update_at_#in~data#1| 3) (= |ULTIMATE.start_sll_circular_update_at_~head#1.base| (select (select |#memory_$Pointer$.base| |ULTIMATE.start_sll_circular_update_at_#in~head#1.base|) 0)) (exists ((|v_#memory_$Pointer$.offset_78| (Array Int (Array Int Int))) (|v_#memory_$Pointer$.base_80| (Array Int (Array Int Int))) (|v_ULTIMATE.start_sll_circular_create_~last~0#1.base_16| Int) (|v_#memory_int_72| (Array Int (Array Int Int)))) (and (= |#memory_$Pointer$.offset| (store |v_#memory_$Pointer$.offset_78| |v_ULTIMATE.start_sll_circular_create_~last~0#1.base_16| (store (select |v_#memory_$Pointer$.offset_78| |v_ULTIMATE.start_sll_circular_create_~last~0#1.base_16|) 0 0))) (= (store |v_#memory_$Pointer$.base_80| |v_ULTIMATE.start_sll_circular_create_~last~0#1.base_16| (store (select |v_#memory_$Pointer$.base_80| |v_ULTIMATE.start_sll_circular_create_~last~0#1.base_16|) 0 |ULTIMATE.start_sll_circular_create_#res#1.base|)) |#memory_$Pointer$.base|) (= |#memory_int| (store |v_#memory_int_72| |v_ULTIMATE.start_sll_circular_create_~last~0#1.base_16| (store (select |v_#memory_int_72| |v_ULTIMATE.start_sll_circular_create_~last~0#1.base_16|) 0 (select (select |#memory_int| |v_ULTIMATE.start_sll_circular_create_~last~0#1.base_16|) 0)))) (<= 4 (select |#length| |v_ULTIMATE.start_sll_circular_create_~last~0#1.base_16|)) (= (select |#valid| |v_ULTIMATE.start_sll_circular_create_~last~0#1.base_16|) 1))) (= |ULTIMATE.start_sll_circular_create_#res#1.offset| 0) (= |ULTIMATE.start_sll_circular_update_at_#in~head#1.base| |ULTIMATE.start_main_~s~0#1.base|) (<= 4 (select |#length| |ULTIMATE.start_sll_circular_update_at_#in~head#1.base|)) (= |ULTIMATE.start_main_~i~0#1| 1) (= 3 |ULTIMATE.start_sll_circular_update_at_~data#1|) (= (select (select |#memory_$Pointer$.offset| |ULTIMATE.start_sll_circular_update_at_#in~head#1.base|) 0) |ULTIMATE.start_sll_circular_update_at_~head#1.offset|) (not (= (select |#valid| |ULTIMATE.start_sll_circular_update_at_~head#1.base|) 1)) (= 3 |ULTIMATE.start_main_~new_data~0#1|) (= (select |#valid| |ULTIMATE.start_sll_circular_update_at_#in~head#1.base|) 1) (= |ULTIMATE.start_main_~data~0#1| 1) (= |ULTIMATE.start_sll_circular_update_at_~index#1| 0) (= |ULTIMATE.start_main_~len~0#1| 2) (= |ULTIMATE.start_sll_circular_create_#res#1.base| |ULTIMATE.start_main_~s~0#1.base|) (= |ULTIMATE.start_main_~s~0#1.offset| 0) (= |ULTIMATE.start_sll_circular_update_at_#in~index#1| 1))' at error location [2023-11-23 20:38:01,169 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-23 20:38:01,169 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-11-23 20:38:01,169 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [14, 14] total 16 [2023-11-23 20:38:01,169 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1445470756] [2023-11-23 20:38:01,170 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-11-23 20:38:01,170 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2023-11-23 20:38:01,170 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 20:38:01,171 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2023-11-23 20:38:01,171 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=94, Invalid=1031, Unknown=1, NotChecked=64, Total=1190 [2023-11-23 20:38:01,172 INFO L87 Difference]: Start difference. First operand 63 states and 71 transitions. Second operand has 17 states, 14 states have (on average 1.9285714285714286) internal successors, (27), 14 states have internal predecessors, (27), 2 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-11-23 20:38:01,632 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 20:38:01,633 INFO L93 Difference]: Finished difference Result 84 states and 97 transitions. [2023-11-23 20:38:01,633 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2023-11-23 20:38:01,633 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 14 states have (on average 1.9285714285714286) internal successors, (27), 14 states have internal predecessors, (27), 2 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) Word has length 24 [2023-11-23 20:38:01,636 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 20:38:01,640 INFO L225 Difference]: With dead ends: 84 [2023-11-23 20:38:01,640 INFO L226 Difference]: Without dead ends: 84 [2023-11-23 20:38:01,641 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 76 GetRequests, 38 SyntacticMatches, 1 SemanticMatches, 37 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 176 ImplicationChecksByTransitivity, 2.8s TimeCoverageRelationStatistics Valid=120, Invalid=1289, Unknown=1, NotChecked=72, Total=1482 [2023-11-23 20:38:01,642 INFO L413 NwaCegarLoop]: 38 mSDtfsCounter, 21 mSDsluCounter, 405 mSDsCounter, 0 mSdLazyCounter, 552 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 21 SdHoareTripleChecker+Valid, 443 SdHoareTripleChecker+Invalid, 556 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 552 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2023-11-23 20:38:01,643 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [21 Valid, 443 Invalid, 556 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 552 Invalid, 0 Unknown, 0 Unchecked, 0.4s Time] [2023-11-23 20:38:01,644 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 84 states. [2023-11-23 20:38:01,656 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 84 to 74. [2023-11-23 20:38:01,658 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 74 states, 50 states have (on average 1.62) internal successors, (81), 69 states have internal predecessors, (81), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-11-23 20:38:01,660 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 74 states to 74 states and 87 transitions. [2023-11-23 20:38:01,661 INFO L78 Accepts]: Start accepts. Automaton has 74 states and 87 transitions. Word has length 24 [2023-11-23 20:38:01,662 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 20:38:01,662 INFO L495 AbstractCegarLoop]: Abstraction has 74 states and 87 transitions. [2023-11-23 20:38:01,662 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 14 states have (on average 1.9285714285714286) internal successors, (27), 14 states have internal predecessors, (27), 2 states have call successors, (2), 2 states have call predecessors, (2), 2 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-11-23 20:38:01,662 INFO L276 IsEmpty]: Start isEmpty. Operand 74 states and 87 transitions. [2023-11-23 20:38:01,665 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 25 [2023-11-23 20:38:01,665 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 20:38:01,666 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 20:38:01,694 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_61dce4de-4f0f-4acb-84dd-675f78202d03/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2023-11-23 20:38:01,878 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable10,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_61dce4de-4f0f-4acb-84dd-675f78202d03/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 20:38:01,878 INFO L420 AbstractCegarLoop]: === Iteration 12 === Targeting ULTIMATE.startErr7REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 25 more)] === [2023-11-23 20:38:01,879 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 20:38:01,879 INFO L85 PathProgramCache]: Analyzing trace with hash 1359470003, now seen corresponding path program 1 times [2023-11-23 20:38:01,879 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 20:38:01,879 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [821280085] [2023-11-23 20:38:01,879 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:38:01,879 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 20:38:01,916 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:38:02,629 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 1 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 20:38:02,630 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 20:38:02,630 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [821280085] [2023-11-23 20:38:02,630 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [821280085] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 20:38:02,630 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [370495043] [2023-11-23 20:38:02,630 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:38:02,631 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 20:38:02,631 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_61dce4de-4f0f-4acb-84dd-675f78202d03/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 20:38:02,639 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_61dce4de-4f0f-4acb-84dd-675f78202d03/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 20:38:02,641 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_61dce4de-4f0f-4acb-84dd-675f78202d03/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-11-23 20:38:02,785 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:38:02,788 INFO L262 TraceCheckSpWp]: Trace formula consists of 258 conjuncts, 67 conjunts are in the unsatisfiable core [2023-11-23 20:38:02,795 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 20:38:02,804 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 20:38:02,807 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 20:38:03,048 INFO L349 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2023-11-23 20:38:03,048 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 20:38:03,056 WARN L854 $PredicateComparison]: unable to prove that (and (= |c_ULTIMATE.start_sll_circular_create_~head~0#1.offset| 0) (= |c_ULTIMATE.start_sll_circular_create_~head~0#1.base| |c_ULTIMATE.start_sll_circular_create_~last~0#1.base|) (or (< 7 (select |c_#length| |c_ULTIMATE.start_sll_circular_create_~head~0#1.base|)) (exists ((|v_#length_BEFORE_CALL_58| (Array Int Int))) (let ((.cse0 (@diff |v_#length_BEFORE_CALL_58| |c_#length|))) (and (<= 8 (select |v_#length_BEFORE_CALL_58| |c_ULTIMATE.start_sll_circular_create_~head~0#1.base|)) (= |c_ULTIMATE.start_sll_circular_create_#t~ret5#1.base| .cse0) (= |c_#length| (store |v_#length_BEFORE_CALL_58| .cse0 (select |c_#length| .cse0))))))) (not (= |c_ULTIMATE.start_sll_circular_create_~head~0#1.base| |c_ULTIMATE.start_sll_circular_create_#t~ret5#1.base|))) is different from false [2023-11-23 20:38:03,060 WARN L876 $PredicateComparison]: unable to prove that (and (= |c_ULTIMATE.start_sll_circular_create_~head~0#1.offset| 0) (= |c_ULTIMATE.start_sll_circular_create_~head~0#1.base| |c_ULTIMATE.start_sll_circular_create_~last~0#1.base|) (or (< 7 (select |c_#length| |c_ULTIMATE.start_sll_circular_create_~head~0#1.base|)) (exists ((|v_#length_BEFORE_CALL_58| (Array Int Int))) (let ((.cse0 (@diff |v_#length_BEFORE_CALL_58| |c_#length|))) (and (<= 8 (select |v_#length_BEFORE_CALL_58| |c_ULTIMATE.start_sll_circular_create_~head~0#1.base|)) (= |c_ULTIMATE.start_sll_circular_create_#t~ret5#1.base| .cse0) (= |c_#length| (store |v_#length_BEFORE_CALL_58| .cse0 (select |c_#length| .cse0))))))) (not (= |c_ULTIMATE.start_sll_circular_create_~head~0#1.base| |c_ULTIMATE.start_sll_circular_create_#t~ret5#1.base|))) is different from true [2023-11-23 20:38:03,123 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2023-11-23 20:38:03,128 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2023-11-23 20:38:03,209 INFO L349 Elim1Store]: treesize reduction 19, result has 20.8 percent of original size [2023-11-23 20:38:03,210 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 50 treesize of output 45 [2023-11-23 20:38:03,216 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 24 treesize of output 11 [2023-11-23 20:38:03,312 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 25 treesize of output 13 [2023-11-23 20:38:03,317 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 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 7 treesize of output 3 [2023-11-23 20:38:03,349 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 1 proven. 6 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 20:38:03,350 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-23 20:38:03,494 WARN L854 $PredicateComparison]: unable to prove that (and (forall ((v_ArrVal_513 (Array Int Int)) (v_ArrVal_512 (Array Int Int))) (<= (+ 8 (select (select (store |c_#memory_$Pointer$.offset| |c_ULTIMATE.start_sll_circular_create_~last~0#1.base| v_ArrVal_513) |c_ULTIMATE.start_sll_circular_create_~head~0#1.base|) |c_ULTIMATE.start_sll_circular_create_~head~0#1.offset|)) (select |c_#length| (select (select (store |c_#memory_$Pointer$.base| |c_ULTIMATE.start_sll_circular_create_~last~0#1.base| v_ArrVal_512) |c_ULTIMATE.start_sll_circular_create_~head~0#1.base|) |c_ULTIMATE.start_sll_circular_create_~head~0#1.offset|)))) (forall ((v_ArrVal_513 (Array Int Int))) (<= 0 (+ (select (select (store |c_#memory_$Pointer$.offset| |c_ULTIMATE.start_sll_circular_create_~last~0#1.base| v_ArrVal_513) |c_ULTIMATE.start_sll_circular_create_~head~0#1.base|) |c_ULTIMATE.start_sll_circular_create_~head~0#1.offset|) 4)))) is different from false [2023-11-23 20:38:03,513 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-11-23 20:38:03,513 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 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 37 treesize of output 38 [2023-11-23 20:38:03,521 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-11-23 20:38:03,521 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 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 29 treesize of output 30 [2023-11-23 20:38:03,527 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 52 treesize of output 44 [2023-11-23 20:38:03,532 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 82 treesize of output 70 [2023-11-23 20:38:03,544 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 11 treesize of output 9 [2023-11-23 20:38:03,546 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 9 treesize of output 7 [2023-11-23 20:38:03,562 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-11-23 20:38:03,562 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 20 treesize of output 21 [2023-11-23 20:38:03,567 INFO L173 IndexEqualityManager]: detected equality via solver [2023-11-23 20:38:03,570 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 18 treesize of output 10 [2023-11-23 20:38:03,788 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [370495043] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 20:38:03,788 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [932693113] [2023-11-23 20:38:03,791 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2023-11-23 20:38:03,791 INFO L166 IcfgInterpreter]: Building call graph [2023-11-23 20:38:03,791 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-23 20:38:03,791 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-23 20:38:03,791 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-23 20:38:04,749 INFO L197 IcfgInterpreter]: Interpreting procedure node_create with input of size 43 for LOIs [2023-11-23 20:38:04,846 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-23 20:38:07,846 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2024#(and (= |ULTIMATE.start_sll_circular_update_at_#in~head#1.offset| 0) (<= 1 |#StackHeapBarrier|) (= |ULTIMATE.start_sll_circular_update_at_#in~data#1| 3) (= |ULTIMATE.start_sll_circular_update_at_~head#1.base| (select (select |#memory_$Pointer$.base| |ULTIMATE.start_sll_circular_update_at_#in~head#1.base|) 0)) (= |ULTIMATE.start_sll_circular_create_#res#1.offset| 0) (= |ULTIMATE.start_sll_circular_update_at_#in~head#1.base| |ULTIMATE.start_main_~s~0#1.base|) (<= 4 (select |#length| |ULTIMATE.start_sll_circular_update_at_#in~head#1.base|)) (= |ULTIMATE.start_main_~i~0#1| 1) (or (< (+ 4 |ULTIMATE.start_sll_circular_update_at_~head#1.offset|) 0) (< (select |#length| |ULTIMATE.start_sll_circular_update_at_~head#1.base|) (+ 8 |ULTIMATE.start_sll_circular_update_at_~head#1.offset|))) (= 3 |ULTIMATE.start_sll_circular_update_at_~data#1|) (exists ((|v_#memory_$Pointer$.offset_94| (Array Int (Array Int Int))) (|v_#memory_$Pointer$.base_96| (Array Int (Array Int Int))) (|v_#memory_int_86| (Array Int (Array Int Int))) (|v_ULTIMATE.start_sll_circular_create_~last~0#1.base_18| Int)) (and (<= 4 (select |#length| |v_ULTIMATE.start_sll_circular_create_~last~0#1.base_18|)) (= |#memory_$Pointer$.base| (store |v_#memory_$Pointer$.base_96| |v_ULTIMATE.start_sll_circular_create_~last~0#1.base_18| (store (select |v_#memory_$Pointer$.base_96| |v_ULTIMATE.start_sll_circular_create_~last~0#1.base_18|) 0 |ULTIMATE.start_sll_circular_create_#res#1.base|))) (= |#memory_$Pointer$.offset| (store |v_#memory_$Pointer$.offset_94| |v_ULTIMATE.start_sll_circular_create_~last~0#1.base_18| (store (select |v_#memory_$Pointer$.offset_94| |v_ULTIMATE.start_sll_circular_create_~last~0#1.base_18|) 0 0))) (= (select |#valid| |v_ULTIMATE.start_sll_circular_create_~last~0#1.base_18|) 1) (= |#memory_int| (store |v_#memory_int_86| |v_ULTIMATE.start_sll_circular_create_~last~0#1.base_18| (store (select |v_#memory_int_86| |v_ULTIMATE.start_sll_circular_create_~last~0#1.base_18|) 0 (select (select |#memory_int| |v_ULTIMATE.start_sll_circular_create_~last~0#1.base_18|) 0)))))) (= (select (select |#memory_$Pointer$.offset| |ULTIMATE.start_sll_circular_update_at_#in~head#1.base|) 0) |ULTIMATE.start_sll_circular_update_at_~head#1.offset|) (= 3 |ULTIMATE.start_main_~new_data~0#1|) (= (select |#valid| |ULTIMATE.start_sll_circular_update_at_#in~head#1.base|) 1) (= |ULTIMATE.start_main_~data~0#1| 1) (= |ULTIMATE.start_sll_circular_update_at_~index#1| 0) (= |ULTIMATE.start_main_~len~0#1| 2) (= |ULTIMATE.start_sll_circular_create_#res#1.base| |ULTIMATE.start_main_~s~0#1.base|) (= |ULTIMATE.start_main_~s~0#1.offset| 0) (= |ULTIMATE.start_sll_circular_update_at_#in~index#1| 1))' at error location [2023-11-23 20:38:07,846 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-23 20:38:07,847 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-11-23 20:38:07,847 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [15, 14] total 25 [2023-11-23 20:38:07,847 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1191703162] [2023-11-23 20:38:07,847 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-11-23 20:38:07,848 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 26 states [2023-11-23 20:38:07,848 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 20:38:07,848 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 26 interpolants. [2023-11-23 20:38:07,850 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=146, Invalid=2021, Unknown=3, NotChecked=182, Total=2352 [2023-11-23 20:38:07,850 INFO L87 Difference]: Start difference. First operand 74 states and 87 transitions. Second operand has 26 states, 22 states have (on average 1.5909090909090908) internal successors, (35), 21 states have internal predecessors, (35), 3 states have call successors, (3), 2 states have call predecessors, (3), 3 states have return successors, (4), 4 states have call predecessors, (4), 3 states have call successors, (4) [2023-11-23 20:38:08,120 WARN L854 $PredicateComparison]: unable to prove that (and (= 8 (select |c_#length| |c_ULTIMATE.start_sll_circular_create_~last~0#1.base|)) (not (= |c_ULTIMATE.start_sll_circular_create_~last~0#1.base| |c_ULTIMATE.start_sll_circular_create_#t~ret5#1.base|)) (= |c_ULTIMATE.start_sll_circular_create_~head~0#1.offset| 0) (= |c_ULTIMATE.start_sll_circular_create_~head~0#1.base| |c_ULTIMATE.start_sll_circular_create_~last~0#1.base|) (or (< 7 (select |c_#length| |c_ULTIMATE.start_sll_circular_create_~head~0#1.base|)) (exists ((|v_#length_BEFORE_CALL_58| (Array Int Int))) (let ((.cse0 (@diff |v_#length_BEFORE_CALL_58| |c_#length|))) (and (<= 8 (select |v_#length_BEFORE_CALL_58| |c_ULTIMATE.start_sll_circular_create_~head~0#1.base|)) (= |c_ULTIMATE.start_sll_circular_create_#t~ret5#1.base| .cse0) (= |c_#length| (store |v_#length_BEFORE_CALL_58| .cse0 (select |c_#length| .cse0))))))) (not (= |c_ULTIMATE.start_sll_circular_create_~head~0#1.base| |c_ULTIMATE.start_sll_circular_create_#t~ret5#1.base|))) is different from false [2023-11-23 20:38:08,128 WARN L876 $PredicateComparison]: unable to prove that (and (= 8 (select |c_#length| |c_ULTIMATE.start_sll_circular_create_~last~0#1.base|)) (not (= |c_ULTIMATE.start_sll_circular_create_~last~0#1.base| |c_ULTIMATE.start_sll_circular_create_#t~ret5#1.base|)) (= |c_ULTIMATE.start_sll_circular_create_~head~0#1.offset| 0) (= |c_ULTIMATE.start_sll_circular_create_~head~0#1.base| |c_ULTIMATE.start_sll_circular_create_~last~0#1.base|) (or (< 7 (select |c_#length| |c_ULTIMATE.start_sll_circular_create_~head~0#1.base|)) (exists ((|v_#length_BEFORE_CALL_58| (Array Int Int))) (let ((.cse0 (@diff |v_#length_BEFORE_CALL_58| |c_#length|))) (and (<= 8 (select |v_#length_BEFORE_CALL_58| |c_ULTIMATE.start_sll_circular_create_~head~0#1.base|)) (= |c_ULTIMATE.start_sll_circular_create_#t~ret5#1.base| .cse0) (= |c_#length| (store |v_#length_BEFORE_CALL_58| .cse0 (select |c_#length| .cse0))))))) (not (= |c_ULTIMATE.start_sll_circular_create_~head~0#1.base| |c_ULTIMATE.start_sll_circular_create_#t~ret5#1.base|))) is different from true [2023-11-23 20:38:08,739 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 20:38:08,740 INFO L93 Difference]: Finished difference Result 82 states and 95 transitions. [2023-11-23 20:38:08,740 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 13 states. [2023-11-23 20:38:08,741 INFO L78 Accepts]: Start accepts. Automaton has has 26 states, 22 states have (on average 1.5909090909090908) internal successors, (35), 21 states have internal predecessors, (35), 3 states have call successors, (3), 2 states have call predecessors, (3), 3 states have return successors, (4), 4 states have call predecessors, (4), 3 states have call successors, (4) Word has length 24 [2023-11-23 20:38:08,741 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 20:38:08,742 INFO L225 Difference]: With dead ends: 82 [2023-11-23 20:38:08,742 INFO L226 Difference]: Without dead ends: 82 [2023-11-23 20:38:08,743 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 78 GetRequests, 24 SyntacticMatches, 1 SemanticMatches, 53 ConstructedPredicates, 3 IntricatePredicates, 0 DeprecatedPredicates, 482 ImplicationChecksByTransitivity, 3.9s TimeCoverageRelationStatistics Valid=191, Invalid=2468, Unknown=5, NotChecked=306, Total=2970 [2023-11-23 20:38:08,744 INFO L413 NwaCegarLoop]: 40 mSDtfsCounter, 33 mSDsluCounter, 612 mSDsCounter, 0 mSdLazyCounter, 875 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 33 SdHoareTripleChecker+Valid, 652 SdHoareTripleChecker+Invalid, 989 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 875 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 109 IncrementalHoareTripleChecker+Unchecked, 0.6s IncrementalHoareTripleChecker+Time [2023-11-23 20:38:08,745 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [33 Valid, 652 Invalid, 989 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 875 Invalid, 0 Unknown, 109 Unchecked, 0.6s Time] [2023-11-23 20:38:08,745 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2023-11-23 20:38:08,748 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 71. [2023-11-23 20:38:08,748 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 71 states, 47 states have (on average 1.5957446808510638) internal successors, (75), 66 states have internal predecessors, (75), 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 20:38:08,749 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 71 states to 71 states and 81 transitions. [2023-11-23 20:38:08,749 INFO L78 Accepts]: Start accepts. Automaton has 71 states and 81 transitions. Word has length 24 [2023-11-23 20:38:08,750 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 20:38:08,750 INFO L495 AbstractCegarLoop]: Abstraction has 71 states and 81 transitions. [2023-11-23 20:38:08,750 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 26 states, 22 states have (on average 1.5909090909090908) internal successors, (35), 21 states have internal predecessors, (35), 3 states have call successors, (3), 2 states have call predecessors, (3), 3 states have return successors, (4), 4 states have call predecessors, (4), 3 states have call successors, (4) [2023-11-23 20:38:08,750 INFO L276 IsEmpty]: Start isEmpty. Operand 71 states and 81 transitions. [2023-11-23 20:38:08,751 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 27 [2023-11-23 20:38:08,751 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 20:38:08,751 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 20:38:08,775 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_61dce4de-4f0f-4acb-84dd-675f78202d03/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2023-11-23 20:38:08,966 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_61dce4de-4f0f-4acb-84dd-675f78202d03/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable11 [2023-11-23 20:38:08,966 INFO L420 AbstractCegarLoop]: === Iteration 13 === Targeting ULTIMATE.startErr6REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 25 more)] === [2023-11-23 20:38:08,967 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 20:38:08,967 INFO L85 PathProgramCache]: Analyzing trace with hash 776097757, now seen corresponding path program 2 times [2023-11-23 20:38:08,967 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 20:38:08,967 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1293609513] [2023-11-23 20:38:08,967 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:38:08,967 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 20:38:09,017 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:38:09,129 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 4 proven. 0 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2023-11-23 20:38:09,129 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 20:38:09,129 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1293609513] [2023-11-23 20:38:09,129 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1293609513] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 20:38:09,129 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-23 20:38:09,129 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2023-11-23 20:38:09,130 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1099103797] [2023-11-23 20:38:09,130 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 20:38:09,130 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-11-23 20:38:09,130 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 20:38:09,131 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-11-23 20:38:09,131 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=10, Invalid=20, Unknown=0, NotChecked=0, Total=30 [2023-11-23 20:38:09,132 INFO L87 Difference]: Start difference. First operand 71 states and 81 transitions. Second operand has 6 states, 6 states have (on average 3.0) internal successors, (18), 6 states have internal predecessors, (18), 1 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2023-11-23 20:38:09,226 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 20:38:09,227 INFO L93 Difference]: Finished difference Result 89 states and 100 transitions. [2023-11-23 20:38:09,227 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-11-23 20:38:09,227 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 3.0) internal successors, (18), 6 states have internal predecessors, (18), 1 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 26 [2023-11-23 20:38:09,227 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 20:38:09,228 INFO L225 Difference]: With dead ends: 89 [2023-11-23 20:38:09,228 INFO L226 Difference]: Without dead ends: 89 [2023-11-23 20:38:09,229 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 8 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 4 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=34, Invalid=56, Unknown=0, NotChecked=0, Total=90 [2023-11-23 20:38:09,230 INFO L413 NwaCegarLoop]: 44 mSDtfsCounter, 88 mSDsluCounter, 128 mSDsCounter, 0 mSdLazyCounter, 80 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 88 SdHoareTripleChecker+Valid, 172 SdHoareTripleChecker+Invalid, 82 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 80 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-23 20:38:09,230 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [88 Valid, 172 Invalid, 82 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 80 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-23 20:38:09,231 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 89 states. [2023-11-23 20:38:09,233 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 89 to 74. [2023-11-23 20:38:09,233 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 74 states, 50 states have (on average 1.56) internal successors, (78), 69 states have internal predecessors, (78), 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 20:38:09,234 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 74 states to 74 states and 84 transitions. [2023-11-23 20:38:09,234 INFO L78 Accepts]: Start accepts. Automaton has 74 states and 84 transitions. Word has length 26 [2023-11-23 20:38:09,234 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 20:38:09,234 INFO L495 AbstractCegarLoop]: Abstraction has 74 states and 84 transitions. [2023-11-23 20:38:09,234 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 3.0) internal successors, (18), 6 states have internal predecessors, (18), 1 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2023-11-23 20:38:09,235 INFO L276 IsEmpty]: Start isEmpty. Operand 74 states and 84 transitions. [2023-11-23 20:38:09,235 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 29 [2023-11-23 20:38:09,235 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 20:38:09,236 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 20:38:09,236 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable12 [2023-11-23 20:38:09,236 INFO L420 AbstractCegarLoop]: === Iteration 14 === Targeting ULTIMATE.startErr8REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 25 more)] === [2023-11-23 20:38:09,236 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 20:38:09,236 INFO L85 PathProgramCache]: Analyzing trace with hash -1318488681, now seen corresponding path program 1 times [2023-11-23 20:38:09,236 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 20:38:09,237 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1927136413] [2023-11-23 20:38:09,237 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:38:09,237 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 20:38:09,256 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:38:09,321 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2023-11-23 20:38:09,321 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 20:38:09,321 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1927136413] [2023-11-23 20:38:09,321 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1927136413] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 20:38:09,322 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1787916958] [2023-11-23 20:38:09,322 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:38:09,322 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 20:38:09,322 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_61dce4de-4f0f-4acb-84dd-675f78202d03/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 20:38:09,323 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_61dce4de-4f0f-4acb-84dd-675f78202d03/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 20:38:09,350 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_61dce4de-4f0f-4acb-84dd-675f78202d03/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-11-23 20:38:09,479 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:38:09,480 INFO L262 TraceCheckSpWp]: Trace formula consists of 295 conjuncts, 4 conjunts are in the unsatisfiable core [2023-11-23 20:38:09,483 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 20:38:09,512 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2023-11-23 20:38:09,512 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-23 20:38:09,547 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2023-11-23 20:38:09,547 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1787916958] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-23 20:38:09,547 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1910942808] [2023-11-23 20:38:09,550 INFO L159 IcfgInterpreter]: Started Sifa with 21 locations of interest [2023-11-23 20:38:09,550 INFO L166 IcfgInterpreter]: Building call graph [2023-11-23 20:38:09,551 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-23 20:38:09,551 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-23 20:38:09,551 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-23 20:38:10,906 INFO L197 IcfgInterpreter]: Interpreting procedure node_create with input of size 43 for LOIs [2023-11-23 20:38:10,981 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-23 20:38:12,509 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2551#(and (= |ULTIMATE.start_main_~s~0#1.offset| |ULTIMATE.start_sll_circular_get_data_at_#in~head#1.offset|) (= |ULTIMATE.start_main_~s~0#1.base| |ULTIMATE.start_sll_circular_get_data_at_#in~head#1.base|) (= (+ |ULTIMATE.start_main_~len~0#1| |ULTIMATE.start_main_~i~0#1|) |ULTIMATE.start_main_~expected~0#1|) (<= 1 |ULTIMATE.start_sll_circular_get_data_at_~index#1|) (= |ULTIMATE.start_sll_circular_get_data_at_~index#1| |ULTIMATE.start_sll_circular_get_data_at_#in~index#1|) (= |ULTIMATE.start_main_~i~0#1| |ULTIMATE.start_sll_circular_get_data_at_#in~index#1|) (= |ULTIMATE.start_sll_circular_get_data_at_~head#1.offset| |ULTIMATE.start_sll_circular_get_data_at_#in~head#1.offset|) (not (= (select |#valid| |ULTIMATE.start_sll_circular_get_data_at_~head#1.base|) 1)) (= |ULTIMATE.start_main_~len~0#1| (+ |ULTIMATE.start_main_~i~0#1| 1)) (= |ULTIMATE.start_sll_circular_get_data_at_~head#1.base| |ULTIMATE.start_sll_circular_get_data_at_#in~head#1.base|))' at error location [2023-11-23 20:38:12,510 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-23 20:38:12,510 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-23 20:38:12,510 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [5, 5, 5] total 7 [2023-11-23 20:38:12,510 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1382616628] [2023-11-23 20:38:12,510 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-23 20:38:12,511 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-11-23 20:38:12,511 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 20:38:12,511 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-11-23 20:38:12,512 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=86, Invalid=514, Unknown=0, NotChecked=0, Total=600 [2023-11-23 20:38:12,512 INFO L87 Difference]: Start difference. First operand 74 states and 84 transitions. Second operand has 7 states, 7 states have (on average 4.571428571428571) internal successors, (32), 7 states have internal predecessors, (32), 2 states have call successors, (4), 1 states have call predecessors, (4), 1 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2023-11-23 20:38:12,598 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 20:38:12,598 INFO L93 Difference]: Finished difference Result 91 states and 102 transitions. [2023-11-23 20:38:12,599 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-11-23 20:38:12,599 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 4.571428571428571) internal successors, (32), 7 states have internal predecessors, (32), 2 states have call successors, (4), 1 states have call predecessors, (4), 1 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) Word has length 28 [2023-11-23 20:38:12,599 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 20:38:12,600 INFO L225 Difference]: With dead ends: 91 [2023-11-23 20:38:12,600 INFO L226 Difference]: Without dead ends: 91 [2023-11-23 20:38:12,601 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 89 GetRequests, 61 SyntacticMatches, 3 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 171 ImplicationChecksByTransitivity, 1.6s TimeCoverageRelationStatistics Valid=100, Invalid=602, Unknown=0, NotChecked=0, Total=702 [2023-11-23 20:38:12,601 INFO L413 NwaCegarLoop]: 45 mSDtfsCounter, 129 mSDsluCounter, 53 mSDsCounter, 0 mSdLazyCounter, 42 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 129 SdHoareTripleChecker+Valid, 98 SdHoareTripleChecker+Invalid, 49 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 42 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-23 20:38:12,602 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [129 Valid, 98 Invalid, 49 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 42 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-23 20:38:12,602 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 91 states. [2023-11-23 20:38:12,613 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 91 to 82. [2023-11-23 20:38:12,613 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 82 states, 58 states have (on average 1.6206896551724137) internal successors, (94), 77 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 20:38:12,615 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 100 transitions. [2023-11-23 20:38:12,616 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 100 transitions. Word has length 28 [2023-11-23 20:38:12,616 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 20:38:12,616 INFO L495 AbstractCegarLoop]: Abstraction has 82 states and 100 transitions. [2023-11-23 20:38:12,616 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 4.571428571428571) internal successors, (32), 7 states have internal predecessors, (32), 2 states have call successors, (4), 1 states have call predecessors, (4), 1 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2023-11-23 20:38:12,617 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 100 transitions. [2023-11-23 20:38:12,617 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 30 [2023-11-23 20:38:12,617 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 20:38:12,618 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 20:38:12,633 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_61dce4de-4f0f-4acb-84dd-675f78202d03/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Ended with exit code 0 [2023-11-23 20:38:12,822 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_61dce4de-4f0f-4acb-84dd-675f78202d03/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable13 [2023-11-23 20:38:12,822 INFO L420 AbstractCegarLoop]: === Iteration 15 === Targeting ULTIMATE.startErr6REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 25 more)] === [2023-11-23 20:38:12,823 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 20:38:12,823 INFO L85 PathProgramCache]: Analyzing trace with hash 1921624963, now seen corresponding path program 1 times [2023-11-23 20:38:12,823 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 20:38:12,823 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [88459344] [2023-11-23 20:38:12,823 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:38:12,823 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 20:38:12,855 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:38:12,997 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 5 proven. 3 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2023-11-23 20:38:12,998 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 20:38:12,998 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [88459344] [2023-11-23 20:38:12,998 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [88459344] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 20:38:12,998 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1927286990] [2023-11-23 20:38:12,998 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:38:12,998 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 20:38:12,998 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_61dce4de-4f0f-4acb-84dd-675f78202d03/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 20:38:13,006 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_61dce4de-4f0f-4acb-84dd-675f78202d03/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 20:38:13,022 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_61dce4de-4f0f-4acb-84dd-675f78202d03/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2023-11-23 20:38:13,162 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:38:13,164 INFO L262 TraceCheckSpWp]: Trace formula consists of 307 conjuncts, 6 conjunts are in the unsatisfiable core [2023-11-23 20:38:13,175 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 20:38:13,207 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 6 proven. 2 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2023-11-23 20:38:13,207 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-23 20:38:13,247 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 6 proven. 2 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2023-11-23 20:38:13,247 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1927286990] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-23 20:38:13,247 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [13832166] [2023-11-23 20:38:13,253 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2023-11-23 20:38:13,253 INFO L166 IcfgInterpreter]: Building call graph [2023-11-23 20:38:13,253 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-23 20:38:13,253 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-23 20:38:13,254 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-23 20:38:14,477 INFO L197 IcfgInterpreter]: Interpreting procedure node_create with input of size 43 for LOIs [2023-11-23 20:38:14,550 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-23 20:38:15,854 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '2922#(and (not (= (select |#valid| |ULTIMATE.start_sll_circular_update_at_~head#1.base|) 1)) (= |ULTIMATE.start_sll_circular_update_at_~index#1| 0))' at error location [2023-11-23 20:38:15,855 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-23 20:38:15,855 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-23 20:38:15,855 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [6, 6, 6] total 8 [2023-11-23 20:38:15,855 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [908422272] [2023-11-23 20:38:15,855 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-23 20:38:15,856 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2023-11-23 20:38:15,856 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 20:38:15,856 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2023-11-23 20:38:15,857 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=72, Invalid=434, Unknown=0, NotChecked=0, Total=506 [2023-11-23 20:38:15,857 INFO L87 Difference]: Start difference. First operand 82 states and 100 transitions. Second operand has 8 states, 8 states have (on average 4.125) internal successors, (33), 8 states have internal predecessors, (33), 2 states have call successors, (4), 1 states have call predecessors, (4), 1 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2023-11-23 20:38:15,996 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 20:38:15,996 INFO L93 Difference]: Finished difference Result 83 states and 92 transitions. [2023-11-23 20:38:15,998 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 7 states. [2023-11-23 20:38:15,998 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 4.125) internal successors, (33), 8 states have internal predecessors, (33), 2 states have call successors, (4), 1 states have call predecessors, (4), 1 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) Word has length 29 [2023-11-23 20:38:15,998 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 20:38:15,999 INFO L225 Difference]: With dead ends: 83 [2023-11-23 20:38:15,999 INFO L226 Difference]: Without dead ends: 83 [2023-11-23 20:38:16,000 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 95 GetRequests, 67 SyntacticMatches, 3 SemanticMatches, 25 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 114 ImplicationChecksByTransitivity, 1.4s TimeCoverageRelationStatistics Valid=100, Invalid=602, Unknown=0, NotChecked=0, Total=702 [2023-11-23 20:38:16,000 INFO L413 NwaCegarLoop]: 48 mSDtfsCounter, 196 mSDsluCounter, 108 mSDsCounter, 0 mSdLazyCounter, 90 mSolverCounterSat, 5 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 196 SdHoareTripleChecker+Valid, 156 SdHoareTripleChecker+Invalid, 95 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 5 IncrementalHoareTripleChecker+Valid, 90 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-23 20:38:16,001 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [196 Valid, 156 Invalid, 95 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [5 Valid, 90 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-23 20:38:16,001 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 83 states. [2023-11-23 20:38:16,003 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 83 to 76. [2023-11-23 20:38:16,004 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 76 states, 54 states have (on average 1.5555555555555556) internal successors, (84), 71 states have internal predecessors, (84), 3 states have call successors, (3), 1 states have call predecessors, (3), 1 states have return successors, (3), 3 states have call predecessors, (3), 3 states have call successors, (3) [2023-11-23 20:38:16,004 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 76 states to 76 states and 90 transitions. [2023-11-23 20:38:16,004 INFO L78 Accepts]: Start accepts. Automaton has 76 states and 90 transitions. Word has length 29 [2023-11-23 20:38:16,005 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 20:38:16,005 INFO L495 AbstractCegarLoop]: Abstraction has 76 states and 90 transitions. [2023-11-23 20:38:16,005 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 4.125) internal successors, (33), 8 states have internal predecessors, (33), 2 states have call successors, (4), 1 states have call predecessors, (4), 1 states have return successors, (4), 2 states have call predecessors, (4), 2 states have call successors, (4) [2023-11-23 20:38:16,005 INFO L276 IsEmpty]: Start isEmpty. Operand 76 states and 90 transitions. [2023-11-23 20:38:16,005 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2023-11-23 20:38:16,005 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 20:38:16,006 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 20:38:16,042 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_61dce4de-4f0f-4acb-84dd-675f78202d03/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2023-11-23 20:38:16,226 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_61dce4de-4f0f-4acb-84dd-675f78202d03/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable14 [2023-11-23 20:38:16,226 INFO L420 AbstractCegarLoop]: === Iteration 16 === Targeting ULTIMATE.startErr8REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 25 more)] === [2023-11-23 20:38:16,227 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 20:38:16,227 INFO L85 PathProgramCache]: Analyzing trace with hash 21528509, now seen corresponding path program 2 times [2023-11-23 20:38:16,227 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 20:38:16,227 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [943143927] [2023-11-23 20:38:16,227 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:38:16,227 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 20:38:16,251 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:38:16,337 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 5 proven. 0 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2023-11-23 20:38:16,337 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 20:38:16,337 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [943143927] [2023-11-23 20:38:16,337 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [943143927] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 20:38:16,338 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-23 20:38:16,338 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [] total 4 [2023-11-23 20:38:16,338 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1433834532] [2023-11-23 20:38:16,338 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 20:38:16,339 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-11-23 20:38:16,339 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 20:38:16,339 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-11-23 20:38:16,339 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=7, Invalid=13, Unknown=0, NotChecked=0, Total=20 [2023-11-23 20:38:16,340 INFO L87 Difference]: Start difference. First operand 76 states and 90 transitions. Second operand has 5 states, 4 states have (on average 5.75) internal successors, (23), 5 states have internal predecessors, (23), 1 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2023-11-23 20:38:16,450 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 20:38:16,450 INFO L93 Difference]: Finished difference Result 103 states and 121 transitions. [2023-11-23 20:38:16,451 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-11-23 20:38:16,451 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 4 states have (on average 5.75) internal successors, (23), 5 states have internal predecessors, (23), 1 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 31 [2023-11-23 20:38:16,451 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 20:38:16,453 INFO L225 Difference]: With dead ends: 103 [2023-11-23 20:38:16,453 INFO L226 Difference]: Without dead ends: 103 [2023-11-23 20:38:16,453 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 6 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 5 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=15, Invalid=27, Unknown=0, NotChecked=0, Total=42 [2023-11-23 20:38:16,454 INFO L413 NwaCegarLoop]: 30 mSDtfsCounter, 51 mSDsluCounter, 75 mSDsCounter, 0 mSdLazyCounter, 118 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 51 SdHoareTripleChecker+Valid, 105 SdHoareTripleChecker+Invalid, 120 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 118 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-23 20:38:16,454 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [51 Valid, 105 Invalid, 120 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 118 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-23 20:38:16,455 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 103 states. [2023-11-23 20:38:16,457 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 103 to 82. [2023-11-23 20:38:16,458 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 82 states, 60 states have (on average 1.6) internal successors, (96), 77 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 20:38:16,458 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 102 transitions. [2023-11-23 20:38:16,459 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 102 transitions. Word has length 31 [2023-11-23 20:38:16,459 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 20:38:16,459 INFO L495 AbstractCegarLoop]: Abstraction has 82 states and 102 transitions. [2023-11-23 20:38:16,459 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 4 states have (on average 5.75) internal successors, (23), 5 states have internal predecessors, (23), 1 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2023-11-23 20:38:16,459 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 102 transitions. [2023-11-23 20:38:16,460 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 32 [2023-11-23 20:38:16,460 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 20:38:16,460 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 20:38:16,460 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable15 [2023-11-23 20:38:16,460 INFO L420 AbstractCegarLoop]: === Iteration 17 === Targeting ULTIMATE.startErr9REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 25 more)] === [2023-11-23 20:38:16,461 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 20:38:16,461 INFO L85 PathProgramCache]: Analyzing trace with hash 21528510, now seen corresponding path program 1 times [2023-11-23 20:38:16,461 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 20:38:16,461 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [44631794] [2023-11-23 20:38:16,461 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:38:16,461 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 20:38:16,493 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:38:16,784 INFO L134 CoverageAnalysis]: Checked inductivity of 13 backedges. 5 proven. 0 refuted. 0 times theorem prover too weak. 8 trivial. 0 not checked. [2023-11-23 20:38:16,784 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 20:38:16,785 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [44631794] [2023-11-23 20:38:16,785 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [44631794] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 20:38:16,785 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-23 20:38:16,785 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [8] imperfect sequences [] total 8 [2023-11-23 20:38:16,785 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [943581628] [2023-11-23 20:38:16,785 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 20:38:16,786 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 9 states [2023-11-23 20:38:16,786 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 20:38:16,787 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 9 interpolants. [2023-11-23 20:38:16,787 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=15, Invalid=57, Unknown=0, NotChecked=0, Total=72 [2023-11-23 20:38:16,787 INFO L87 Difference]: Start difference. First operand 82 states and 102 transitions. Second operand has 9 states, 7 states have (on average 3.4285714285714284) internal successors, (24), 8 states have internal predecessors, (24), 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 20:38:16,973 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 20:38:16,973 INFO L93 Difference]: Finished difference Result 82 states and 98 transitions. [2023-11-23 20:38:16,973 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2023-11-23 20:38:16,974 INFO L78 Accepts]: Start accepts. Automaton has has 9 states, 7 states have (on average 3.4285714285714284) internal successors, (24), 8 states have internal predecessors, (24), 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 31 [2023-11-23 20:38:16,974 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 20:38:16,974 INFO L225 Difference]: With dead ends: 82 [2023-11-23 20:38:16,974 INFO L226 Difference]: Without dead ends: 82 [2023-11-23 20:38:16,975 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 10 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 1 ImplicationChecksByTransitivity, 0.1s TimeCoverageRelationStatistics Valid=23, Invalid=87, Unknown=0, NotChecked=0, Total=110 [2023-11-23 20:38:16,975 INFO L413 NwaCegarLoop]: 36 mSDtfsCounter, 47 mSDsluCounter, 187 mSDsCounter, 0 mSdLazyCounter, 230 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 47 SdHoareTripleChecker+Valid, 223 SdHoareTripleChecker+Invalid, 231 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 230 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.2s IncrementalHoareTripleChecker+Time [2023-11-23 20:38:16,975 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [47 Valid, 223 Invalid, 231 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 230 Invalid, 0 Unknown, 0 Unchecked, 0.2s Time] [2023-11-23 20:38:16,976 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 82 states. [2023-11-23 20:38:16,978 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 82 to 82. [2023-11-23 20:38:16,978 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 82 states, 60 states have (on average 1.5333333333333334) internal successors, (92), 77 states have internal predecessors, (92), 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 20:38:16,981 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 82 states to 82 states and 98 transitions. [2023-11-23 20:38:16,981 INFO L78 Accepts]: Start accepts. Automaton has 82 states and 98 transitions. Word has length 31 [2023-11-23 20:38:16,982 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 20:38:16,982 INFO L495 AbstractCegarLoop]: Abstraction has 82 states and 98 transitions. [2023-11-23 20:38:16,982 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 9 states, 7 states have (on average 3.4285714285714284) internal successors, (24), 8 states have internal predecessors, (24), 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 20:38:16,983 INFO L276 IsEmpty]: Start isEmpty. Operand 82 states and 98 transitions. [2023-11-23 20:38:16,984 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2023-11-23 20:38:16,985 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 20:38:16,985 INFO L195 NwaCegarLoop]: trace histogram [3, 3, 3, 3, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 20:38:16,985 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable16 [2023-11-23 20:38:16,985 INFO L420 AbstractCegarLoop]: === Iteration 18 === Targeting ULTIMATE.startErr6REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 25 more)] === [2023-11-23 20:38:16,986 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 20:38:16,986 INFO L85 PathProgramCache]: Analyzing trace with hash -1058396258, now seen corresponding path program 3 times [2023-11-23 20:38:16,986 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 20:38:16,986 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [465412101] [2023-11-23 20:38:16,986 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:38:16,986 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 20:38:17,009 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:38:17,079 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 5 proven. 1 refuted. 0 times theorem prover too weak. 16 trivial. 0 not checked. [2023-11-23 20:38:17,079 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 20:38:17,079 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [465412101] [2023-11-23 20:38:17,079 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [465412101] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 20:38:17,079 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [215789641] [2023-11-23 20:38:17,079 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-11-23 20:38:17,080 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 20:38:17,080 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_61dce4de-4f0f-4acb-84dd-675f78202d03/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 20:38:17,081 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_61dce4de-4f0f-4acb-84dd-675f78202d03/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 20:38:17,097 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_61dce4de-4f0f-4acb-84dd-675f78202d03/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2023-11-23 20:38:17,251 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-11-23 20:38:17,251 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-23 20:38:17,254 INFO L262 TraceCheckSpWp]: Trace formula consists of 324 conjuncts, 65 conjunts are in the unsatisfiable core [2023-11-23 20:38:17,257 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 20:38:17,260 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 20:38:17,346 INFO L349 Elim1Store]: treesize reduction 13, result has 40.9 percent of original size [2023-11-23 20:38:17,346 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 14 treesize of output 13 [2023-11-23 20:38:17,487 INFO L349 Elim1Store]: treesize reduction 48, result has 28.4 percent of original size [2023-11-23 20:38:17,487 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 1 stores, 3 select indices, 3 select index equivalence classes, 0 disjoint index pairs (out of 3 index pairs), introduced 3 new quantified variables, introduced 5 case distinctions, treesize of input 24 treesize of output 28 [2023-11-23 20:38:17,557 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 2 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 15 treesize of output 1 [2023-11-23 20:38:17,613 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 20:38:17,748 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 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 25 treesize of output 13 [2023-11-23 20:38:17,802 INFO L134 CoverageAnalysis]: Checked inductivity of 22 backedges. 12 proven. 9 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-23 20:38:17,802 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-23 20:38:17,951 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-11-23 20:38:17,952 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 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 20 treesize of output 21 [2023-11-23 20:38:17,964 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 34 treesize of output 26 [2023-11-23 20:38:17,973 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 7 treesize of output 5 [2023-11-23 20:38:18,202 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [215789641] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 20:38:18,202 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [735467576] [2023-11-23 20:38:18,204 INFO L159 IcfgInterpreter]: Started Sifa with 18 locations of interest [2023-11-23 20:38:18,204 INFO L166 IcfgInterpreter]: Building call graph [2023-11-23 20:38:18,204 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-23 20:38:18,205 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-23 20:38:18,205 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-23 20:38:18,929 INFO L197 IcfgInterpreter]: Interpreting procedure node_create with input of size 43 for LOIs [2023-11-23 20:38:19,000 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-23 20:38:21,552 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '3630#(and (= |ULTIMATE.start_sll_circular_update_at_#in~head#1.offset| 0) (<= 1 |#StackHeapBarrier|) (= |ULTIMATE.start_sll_circular_update_at_#in~data#1| 3) (= |ULTIMATE.start_sll_circular_update_at_~head#1.base| (select (select |#memory_$Pointer$.base| |ULTIMATE.start_sll_circular_update_at_#in~head#1.base|) 0)) (exists ((|v_ULTIMATE.start_sll_circular_create_~last~0#1.base_24| Int) (|v_#memory_$Pointer$.base_158| (Array Int (Array Int Int))) (|v_#memory_int_146| (Array Int (Array Int Int))) (|v_#memory_$Pointer$.offset_154| (Array Int (Array Int Int)))) (and (= (select |#valid| |v_ULTIMATE.start_sll_circular_create_~last~0#1.base_24|) 1) (= |#memory_int| (store |v_#memory_int_146| |v_ULTIMATE.start_sll_circular_create_~last~0#1.base_24| (store (select |v_#memory_int_146| |v_ULTIMATE.start_sll_circular_create_~last~0#1.base_24|) 0 (select (select |#memory_int| |v_ULTIMATE.start_sll_circular_create_~last~0#1.base_24|) 0)))) (= |#memory_$Pointer$.offset| (store |v_#memory_$Pointer$.offset_154| |v_ULTIMATE.start_sll_circular_create_~last~0#1.base_24| (store (select |v_#memory_$Pointer$.offset_154| |v_ULTIMATE.start_sll_circular_create_~last~0#1.base_24|) 0 0))) (<= 4 (select |#length| |v_ULTIMATE.start_sll_circular_create_~last~0#1.base_24|)) (= |#memory_$Pointer$.base| (store |v_#memory_$Pointer$.base_158| |v_ULTIMATE.start_sll_circular_create_~last~0#1.base_24| (store (select |v_#memory_$Pointer$.base_158| |v_ULTIMATE.start_sll_circular_create_~last~0#1.base_24|) 0 |ULTIMATE.start_sll_circular_create_#res#1.base|))))) (= |ULTIMATE.start_sll_circular_create_#res#1.offset| 0) (= |ULTIMATE.start_sll_circular_update_at_#in~head#1.base| |ULTIMATE.start_main_~s~0#1.base|) (<= 4 (select |#length| |ULTIMATE.start_sll_circular_update_at_#in~head#1.base|)) (= |ULTIMATE.start_main_~i~0#1| 1) (= 3 |ULTIMATE.start_sll_circular_update_at_~data#1|) (= (select (select |#memory_$Pointer$.offset| |ULTIMATE.start_sll_circular_update_at_#in~head#1.base|) 0) |ULTIMATE.start_sll_circular_update_at_~head#1.offset|) (not (= (select |#valid| |ULTIMATE.start_sll_circular_update_at_~head#1.base|) 1)) (= 3 |ULTIMATE.start_main_~new_data~0#1|) (= (select |#valid| |ULTIMATE.start_sll_circular_update_at_#in~head#1.base|) 1) (= |ULTIMATE.start_main_~data~0#1| 1) (= |ULTIMATE.start_sll_circular_update_at_~index#1| 0) (= |ULTIMATE.start_main_~len~0#1| 2) (= |ULTIMATE.start_sll_circular_create_#res#1.base| |ULTIMATE.start_main_~s~0#1.base|) (= |ULTIMATE.start_main_~s~0#1.offset| 0) (= |ULTIMATE.start_sll_circular_update_at_#in~index#1| 1))' at error location [2023-11-23 20:38:21,552 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-23 20:38:21,552 INFO L185 FreeRefinementEngine]: Found 0 perfect and 2 imperfect interpolant sequences. [2023-11-23 20:38:21,552 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 19] total 22 [2023-11-23 20:38:21,552 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1136498387] [2023-11-23 20:38:21,552 INFO L85 oduleStraightlineAll]: Using 2 imperfect interpolants to construct interpolant automaton [2023-11-23 20:38:21,553 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 22 states [2023-11-23 20:38:21,553 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 20:38:21,553 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 22 interpolants. [2023-11-23 20:38:21,554 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=156, Invalid=1816, Unknown=8, NotChecked=0, Total=1980 [2023-11-23 20:38:21,554 INFO L87 Difference]: Start difference. First operand 82 states and 98 transitions. Second operand has 22 states, 19 states have (on average 2.4210526315789473) internal successors, (46), 18 states have internal predecessors, (46), 5 states have call successors, (6), 2 states have call predecessors, (6), 4 states have return successors, (6), 5 states have call predecessors, (6), 5 states have call successors, (6) [2023-11-23 20:38:22,174 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 20:38:22,174 INFO L93 Difference]: Finished difference Result 70 states and 83 transitions. [2023-11-23 20:38:22,174 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 14 states. [2023-11-23 20:38:22,175 INFO L78 Accepts]: Start accepts. Automaton has has 22 states, 19 states have (on average 2.4210526315789473) internal successors, (46), 18 states have internal predecessors, (46), 5 states have call successors, (6), 2 states have call predecessors, (6), 4 states have return successors, (6), 5 states have call predecessors, (6), 5 states have call successors, (6) Word has length 33 [2023-11-23 20:38:22,175 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 20:38:22,175 INFO L225 Difference]: With dead ends: 70 [2023-11-23 20:38:22,175 INFO L226 Difference]: Without dead ends: 70 [2023-11-23 20:38:22,176 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 88 GetRequests, 36 SyntacticMatches, 0 SemanticMatches, 52 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 711 ImplicationChecksByTransitivity, 3.4s TimeCoverageRelationStatistics Valid=234, Invalid=2620, Unknown=8, NotChecked=0, Total=2862 [2023-11-23 20:38:22,177 INFO L413 NwaCegarLoop]: 33 mSDtfsCounter, 7 mSDsluCounter, 320 mSDsCounter, 0 mSdLazyCounter, 501 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.3s Time, 0 mProtectedPredicate, 0 mProtectedAction, 7 SdHoareTripleChecker+Valid, 353 SdHoareTripleChecker+Invalid, 503 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 501 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.3s IncrementalHoareTripleChecker+Time [2023-11-23 20:38:22,177 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [7 Valid, 353 Invalid, 503 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 501 Invalid, 0 Unknown, 0 Unchecked, 0.3s Time] [2023-11-23 20:38:22,178 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 70 states. [2023-11-23 20:38:22,180 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 70 to 70. [2023-11-23 20:38:22,180 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 70 states, 51 states have (on average 1.5490196078431373) internal successors, (79), 66 states have internal predecessors, (79), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-11-23 20:38:22,181 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 70 states to 70 states and 83 transitions. [2023-11-23 20:38:22,181 INFO L78 Accepts]: Start accepts. Automaton has 70 states and 83 transitions. Word has length 33 [2023-11-23 20:38:22,181 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 20:38:22,181 INFO L495 AbstractCegarLoop]: Abstraction has 70 states and 83 transitions. [2023-11-23 20:38:22,181 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 22 states, 19 states have (on average 2.4210526315789473) internal successors, (46), 18 states have internal predecessors, (46), 5 states have call successors, (6), 2 states have call predecessors, (6), 4 states have return successors, (6), 5 states have call predecessors, (6), 5 states have call successors, (6) [2023-11-23 20:38:22,181 INFO L276 IsEmpty]: Start isEmpty. Operand 70 states and 83 transitions. [2023-11-23 20:38:22,182 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2023-11-23 20:38:22,182 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 20:38:22,182 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 20:38:22,208 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_61dce4de-4f0f-4acb-84dd-675f78202d03/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2023-11-23 20:38:22,386 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_61dce4de-4f0f-4acb-84dd-675f78202d03/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable17 [2023-11-23 20:38:22,386 INFO L420 AbstractCegarLoop]: === Iteration 19 === Targeting ULTIMATE.startErr8REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 25 more)] === [2023-11-23 20:38:22,387 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 20:38:22,387 INFO L85 PathProgramCache]: Analyzing trace with hash -785836825, now seen corresponding path program 1 times [2023-11-23 20:38:22,387 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 20:38:22,387 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1457257416] [2023-11-23 20:38:22,387 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:38:22,387 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 20:38:22,420 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:38:22,526 INFO L134 CoverageAnalysis]: Checked inductivity of 15 backedges. 2 proven. 0 refuted. 0 times theorem prover too weak. 13 trivial. 0 not checked. [2023-11-23 20:38:22,527 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 20:38:22,527 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1457257416] [2023-11-23 20:38:22,527 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1457257416] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 20:38:22,527 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-23 20:38:22,527 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [6] imperfect sequences [] total 6 [2023-11-23 20:38:22,527 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [840306469] [2023-11-23 20:38:22,527 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 20:38:22,530 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 6 states [2023-11-23 20:38:22,530 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 20:38:22,531 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 6 interpolants. [2023-11-23 20:38:22,531 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=11, Invalid=19, Unknown=0, NotChecked=0, Total=30 [2023-11-23 20:38:22,531 INFO L87 Difference]: Start difference. First operand 70 states and 83 transitions. Second operand has 6 states, 6 states have (on average 3.6666666666666665) internal successors, (22), 6 states have internal predecessors, (22), 1 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2023-11-23 20:38:22,594 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 20:38:22,594 INFO L93 Difference]: Finished difference Result 66 states and 75 transitions. [2023-11-23 20:38:22,595 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 6 states. [2023-11-23 20:38:22,595 INFO L78 Accepts]: Start accepts. Automaton has has 6 states, 6 states have (on average 3.6666666666666665) internal successors, (22), 6 states have internal predecessors, (22), 1 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) Word has length 33 [2023-11-23 20:38:22,595 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 20:38:22,596 INFO L225 Difference]: With dead ends: 66 [2023-11-23 20:38:22,596 INFO L226 Difference]: Without dead ends: 66 [2023-11-23 20:38:22,596 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 8 GetRequests, 2 SyntacticMatches, 0 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 2 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=23, Invalid=33, Unknown=0, NotChecked=0, Total=56 [2023-11-23 20:38:22,597 INFO L413 NwaCegarLoop]: 36 mSDtfsCounter, 44 mSDsluCounter, 47 mSDsCounter, 0 mSdLazyCounter, 48 mSolverCounterSat, 4 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 44 SdHoareTripleChecker+Valid, 83 SdHoareTripleChecker+Invalid, 52 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 4 IncrementalHoareTripleChecker+Valid, 48 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-23 20:38:22,598 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [44 Valid, 83 Invalid, 52 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [4 Valid, 48 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-23 20:38:22,598 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 66 states. [2023-11-23 20:38:22,600 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 66 to 66. [2023-11-23 20:38:22,601 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 66 states, 49 states have (on average 1.4489795918367347) internal successors, (71), 62 states have internal predecessors, (71), 2 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 2 states have call predecessors, (2), 2 states have call successors, (2) [2023-11-23 20:38:22,601 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 66 states to 66 states and 75 transitions. [2023-11-23 20:38:22,601 INFO L78 Accepts]: Start accepts. Automaton has 66 states and 75 transitions. Word has length 33 [2023-11-23 20:38:22,602 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 20:38:22,602 INFO L495 AbstractCegarLoop]: Abstraction has 66 states and 75 transitions. [2023-11-23 20:38:22,602 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 6 states, 6 states have (on average 3.6666666666666665) internal successors, (22), 6 states have internal predecessors, (22), 1 states have call successors, (2), 1 states have call predecessors, (2), 1 states have return successors, (2), 1 states have call predecessors, (2), 1 states have call successors, (2) [2023-11-23 20:38:22,602 INFO L276 IsEmpty]: Start isEmpty. Operand 66 states and 75 transitions. [2023-11-23 20:38:22,603 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 34 [2023-11-23 20:38:22,603 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 20:38:22,603 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 20:38:22,603 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable18 [2023-11-23 20:38:22,604 INFO L420 AbstractCegarLoop]: === Iteration 20 === Targeting ULTIMATE.startErr10REQUIRES_VIOLATIONMEMORY_DEREFERENCE === [ULTIMATE.startErr0REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr1REQUIRES_VIOLATIONMEMORY_DEREFERENCE, ULTIMATE.startErr2REQUIRES_VIOLATIONMEMORY_DEREFERENCE (and 25 more)] === [2023-11-23 20:38:22,604 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 20:38:22,604 INFO L85 PathProgramCache]: Analyzing trace with hash -785832974, now seen corresponding path program 1 times [2023-11-23 20:38:22,604 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 20:38:22,605 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [546671870] [2023-11-23 20:38:22,605 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:38:22,605 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 20:38:22,639 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:38:23,508 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 3 proven. 11 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 20:38:23,508 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 20:38:23,508 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [546671870] [2023-11-23 20:38:23,508 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [546671870] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 20:38:23,508 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1567547787] [2023-11-23 20:38:23,508 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 20:38:23,509 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 20:38:23,509 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_61dce4de-4f0f-4acb-84dd-675f78202d03/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 20:38:23,510 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_61dce4de-4f0f-4acb-84dd-675f78202d03/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 20:38:23,542 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_61dce4de-4f0f-4acb-84dd-675f78202d03/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2023-11-23 20:38:23,701 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 20:38:23,704 INFO L262 TraceCheckSpWp]: Trace formula consists of 344 conjuncts, 70 conjunts are in the unsatisfiable core [2023-11-23 20:38:23,712 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 20:38:23,715 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 20:38:23,786 INFO L349 Elim1Store]: treesize reduction 4, result has 50.0 percent of original size [2023-11-23 20:38:23,787 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 20:38:23,844 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2023-11-23 20:38:23,888 INFO L349 Elim1Store]: treesize reduction 19, result has 20.8 percent of original size [2023-11-23 20:38:23,888 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 34 treesize of output 33 [2023-11-23 20:38:24,032 INFO L349 Elim1Store]: treesize reduction 19, result has 20.8 percent of original size [2023-11-23 20:38:24,033 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 34 treesize of output 33 [2023-11-23 20:38:24,106 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-23 20:38:24,106 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 37 treesize of output 17 [2023-11-23 20:38:24,157 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 25 treesize of output 13 [2023-11-23 20:38:24,161 INFO L134 CoverageAnalysis]: Checked inductivity of 14 backedges. 1 proven. 10 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-11-23 20:38:24,161 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-23 20:38:24,181 WARN L854 $PredicateComparison]: unable to prove that (forall ((v_ArrVal_1135 (Array Int Int))) (or (not (= (let ((.cse0 (+ |c_ULTIMATE.start_sll_circular_update_at_~head#1.offset| 4))) (store (select |c_#memory_$Pointer$.base| |c_ULTIMATE.start_sll_circular_update_at_~head#1.base|) .cse0 (select v_ArrVal_1135 .cse0))) v_ArrVal_1135)) (= (select |c_#valid| (select (select (store |c_#memory_$Pointer$.base| |c_ULTIMATE.start_sll_circular_update_at_~head#1.base| v_ArrVal_1135) |c_ULTIMATE.start_main_~s~0#1.base|) |c_ULTIMATE.start_main_~s~0#1.offset|)) 1))) is different from false [2023-11-23 20:38:24,247 WARN L854 $PredicateComparison]: unable to prove that (forall ((v_ArrVal_1134 (Array Int Int))) (= (select |c_#valid| (select (select (store |c_#memory_$Pointer$.base| |c_ULTIMATE.start_sll_circular_update_at_~head#1.base| v_ArrVal_1134) |c_ULTIMATE.start_main_~s~0#1.base|) |c_ULTIMATE.start_main_~s~0#1.offset|)) 1)) is different from false [2023-11-23 20:38:24,318 WARN L854 $PredicateComparison]: unable to prove that (forall ((v_ArrVal_1134 (Array Int Int))) (= (select |c_#valid| (select (select (store |c_#memory_$Pointer$.base| (select (select |c_#memory_$Pointer$.base| |c_ULTIMATE.start_main_~s~0#1.base|) |c_ULTIMATE.start_main_~s~0#1.offset|) v_ArrVal_1134) |c_ULTIMATE.start_main_~s~0#1.base|) |c_ULTIMATE.start_main_~s~0#1.offset|)) 1)) is different from false [2023-11-23 20:38:24,330 INFO L349 Elim1Store]: treesize reduction 5, result has 80.0 percent of original size [2023-11-23 20:38:24,331 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 29 treesize of output 28 [2023-11-23 20:38:24,336 WARN L854 $PredicateComparison]: unable to prove that (forall ((v_ArrVal_1134 (Array Int Int)) (v_ArrVal_1133 (Array Int Int))) (= |c_ULTIMATE.start_sll_circular_create_~last~0#1.base| (select (select (let ((.cse0 (store |c_#memory_$Pointer$.base| |c_ULTIMATE.start_sll_circular_create_~last~0#1.base| v_ArrVal_1133))) (store .cse0 (select (select .cse0 |c_ULTIMATE.start_sll_circular_create_~head~0#1.base|) |c_ULTIMATE.start_sll_circular_create_~head~0#1.offset|) v_ArrVal_1134)) |c_ULTIMATE.start_sll_circular_create_~head~0#1.base|) |c_ULTIMATE.start_sll_circular_create_~head~0#1.offset|))) is different from false [2023-11-23 20:38:24,346 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-11-23 20:38:24,346 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 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 36 treesize of output 29 [2023-11-23 20:38:24,349 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 236 treesize of output 200 [2023-11-23 20:38:24,358 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 155 treesize of output 147 [2023-11-23 20:38:24,362 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 147 treesize of output 135 [2023-11-23 20:38:24,478 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1567547787] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 20:38:24,478 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [114316909] [2023-11-23 20:38:24,480 INFO L159 IcfgInterpreter]: Started Sifa with 22 locations of interest [2023-11-23 20:38:24,481 INFO L166 IcfgInterpreter]: Building call graph [2023-11-23 20:38:24,481 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-23 20:38:24,481 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-23 20:38:24,481 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-23 20:38:25,697 INFO L197 IcfgInterpreter]: Interpreting procedure node_create with input of size 43 for LOIs [2023-11-23 20:38:25,796 INFO L180 IcfgInterpreter]: Interpretation finished