./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/list-simple/sll2n_remove_all_reverse.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 4fc63b2a 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_44d5205a-1f1c-44ad-9d37-ea19cee96eca/bin/utaipan-verify-DbMuA5NWw2/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_44d5205a-1f1c-44ad-9d37-ea19cee96eca/bin/utaipan-verify-DbMuA5NWw2/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_44d5205a-1f1c-44ad-9d37-ea19cee96eca/bin/utaipan-verify-DbMuA5NWw2/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_44d5205a-1f1c-44ad-9d37-ea19cee96eca/bin/utaipan-verify-DbMuA5NWw2/config/TaipanReach.xml -i ../../sv-benchmarks/c/list-simple/sll2n_remove_all_reverse.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_44d5205a-1f1c-44ad-9d37-ea19cee96eca/bin/utaipan-verify-DbMuA5NWw2/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_44d5205a-1f1c-44ad-9d37-ea19cee96eca/bin/utaipan-verify-DbMuA5NWw2 --witnessprinter.witness.filename witness --witnessprinter.write.witness.besides.input.file false --witnessprinter.graph.data.specification CHECK( init(main()), LTL(G ! call(reach_error())) ) --witnessprinter.graph.data.producer Taipan --witnessprinter.graph.data.architecture 32bit --witnessprinter.graph.data.programhash b3d7899c651fa61cfb9cf623e0f4ceb470fe32eb0d0272d2277c965ed07c2f88 --- Real Ultimate output --- This is Ultimate 0.2.5-dev-4fc63b2 [2024-11-02 12:38:38,970 INFO L188 SettingsManager]: Resetting all preferences to default values... [2024-11-02 12:38:39,065 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_44d5205a-1f1c-44ad-9d37-ea19cee96eca/bin/utaipan-verify-DbMuA5NWw2/config/svcomp-Reach-32bit-Taipan_Default.epf [2024-11-02 12:38:39,070 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2024-11-02 12:38:39,070 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2024-11-02 12:38:39,107 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2024-11-02 12:38:39,108 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2024-11-02 12:38:39,109 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2024-11-02 12:38:39,109 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2024-11-02 12:38:39,110 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2024-11-02 12:38:39,111 INFO L153 SettingsManager]: * User list type=DISABLED [2024-11-02 12:38:39,112 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2024-11-02 12:38:39,112 INFO L153 SettingsManager]: * Explicit value domain=true [2024-11-02 12:38:39,114 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2024-11-02 12:38:39,115 INFO L153 SettingsManager]: * Octagon Domain=false [2024-11-02 12:38:39,115 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2024-11-02 12:38:39,116 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2024-11-02 12:38:39,116 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2024-11-02 12:38:39,117 INFO L153 SettingsManager]: * Interval Domain=false [2024-11-02 12:38:39,119 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2024-11-02 12:38:39,120 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2024-11-02 12:38:39,120 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2024-11-02 12:38:39,121 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2024-11-02 12:38:39,122 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2024-11-02 12:38:39,122 INFO L153 SettingsManager]: * sizeof long=4 [2024-11-02 12:38:39,122 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2024-11-02 12:38:39,123 INFO L153 SettingsManager]: * sizeof POINTER=4 [2024-11-02 12:38:39,123 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2024-11-02 12:38:39,123 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2024-11-02 12:38:39,124 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2024-11-02 12:38:39,124 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2024-11-02 12:38:39,125 INFO L153 SettingsManager]: * Allow undefined functions=false [2024-11-02 12:38:39,125 INFO L153 SettingsManager]: * sizeof long double=12 [2024-11-02 12:38:39,125 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2024-11-02 12:38:39,126 INFO L153 SettingsManager]: * Use constant arrays=true [2024-11-02 12:38:39,126 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2024-11-02 12:38:39,126 INFO L153 SettingsManager]: * Only consider context switches at boundaries of atomic blocks=true [2024-11-02 12:38:39,127 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2024-11-02 12:38:39,127 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2024-11-02 12:38:39,127 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2024-11-02 12:38:39,128 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2024-11-02 12:38:39,128 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2024-11-02 12:38:39,129 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2024-11-02 12:38:39,129 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2024-11-02 12:38:39,129 INFO L153 SettingsManager]: * Apply one-shot large block encoding in concurrent analysis=false [2024-11-02 12:38:39,130 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2024-11-02 12:38:39,130 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2024-11-02 12:38:39,130 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_44d5205a-1f1c-44ad-9d37-ea19cee96eca/bin/utaipan-verify-DbMuA5NWw2/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$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_44d5205a-1f1c-44ad-9d37-ea19cee96eca/bin/utaipan-verify-DbMuA5NWw2 Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> b3d7899c651fa61cfb9cf623e0f4ceb470fe32eb0d0272d2277c965ed07c2f88 [2024-11-02 12:38:39,446 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2024-11-02 12:38:39,478 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2024-11-02 12:38:39,481 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2024-11-02 12:38:39,484 INFO L270 PluginConnector]: Initializing CDTParser... [2024-11-02 12:38:39,484 INFO L274 PluginConnector]: CDTParser initialized [2024-11-02 12:38:39,485 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_44d5205a-1f1c-44ad-9d37-ea19cee96eca/bin/utaipan-verify-DbMuA5NWw2/../../sv-benchmarks/c/list-simple/sll2n_remove_all_reverse.i Unable to find full path for "g++" [2024-11-02 12:38:41,380 INFO L533 CDTParser]: Created temporary CDT project at NULL [2024-11-02 12:38:41,705 INFO L384 CDTParser]: Found 1 translation units. [2024-11-02 12:38:41,705 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_44d5205a-1f1c-44ad-9d37-ea19cee96eca/sv-benchmarks/c/list-simple/sll2n_remove_all_reverse.i [2024-11-02 12:38:41,722 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_44d5205a-1f1c-44ad-9d37-ea19cee96eca/bin/utaipan-verify-DbMuA5NWw2/data/eb7125a7f/93123383121e405c926bc75fc11632e4/FLAG70a80c336 [2024-11-02 12:38:41,740 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_44d5205a-1f1c-44ad-9d37-ea19cee96eca/bin/utaipan-verify-DbMuA5NWw2/data/eb7125a7f/93123383121e405c926bc75fc11632e4 [2024-11-02 12:38:41,742 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2024-11-02 12:38:41,744 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2024-11-02 12:38:41,746 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2024-11-02 12:38:41,746 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2024-11-02 12:38:41,752 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2024-11-02 12:38:41,754 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.11 12:38:41" (1/1) ... [2024-11-02 12:38:41,758 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@4501f8d2 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 12:38:41, skipping insertion in model container [2024-11-02 12:38:41,758 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 02.11 12:38:41" (1/1) ... [2024-11-02 12:38:41,802 INFO L175 MainTranslator]: Built tables and reachable declarations [2024-11-02 12:38:42,145 WARN L251 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_44d5205a-1f1c-44ad-9d37-ea19cee96eca/sv-benchmarks/c/list-simple/sll2n_remove_all_reverse.i[24038,24051] [2024-11-02 12:38:42,150 INFO L210 PostProcessor]: Analyzing one entry point: main [2024-11-02 12:38:42,162 INFO L200 MainTranslator]: Completed pre-run [2024-11-02 12:38:42,237 WARN L251 ndardFunctionHandler]: Function reach_error is already implemented but we override the implementation for the call at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_44d5205a-1f1c-44ad-9d37-ea19cee96eca/sv-benchmarks/c/list-simple/sll2n_remove_all_reverse.i[24038,24051] [2024-11-02 12:38:42,238 INFO L210 PostProcessor]: Analyzing one entry point: main [2024-11-02 12:38:42,282 INFO L204 MainTranslator]: Completed translation [2024-11-02 12:38:42,283 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 12:38:42 WrapperNode [2024-11-02 12:38:42,283 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2024-11-02 12:38:42,284 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2024-11-02 12:38:42,284 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2024-11-02 12:38:42,284 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2024-11-02 12:38:42,292 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 12:38:42" (1/1) ... [2024-11-02 12:38:42,308 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 12:38:42" (1/1) ... [2024-11-02 12:38:42,332 INFO L138 Inliner]: procedures = 126, calls = 30, calls flagged for inlining = 6, calls inlined = 6, statements flattened = 103 [2024-11-02 12:38:42,332 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2024-11-02 12:38:42,333 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2024-11-02 12:38:42,333 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2024-11-02 12:38:42,333 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2024-11-02 12:38:42,343 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 12:38:42" (1/1) ... [2024-11-02 12:38:42,343 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 12:38:42" (1/1) ... [2024-11-02 12:38:42,348 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 12:38:42" (1/1) ... [2024-11-02 12:38:42,352 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 12:38:42" (1/1) ... [2024-11-02 12:38:42,362 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 12:38:42" (1/1) ... [2024-11-02 12:38:42,370 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 12:38:42" (1/1) ... [2024-11-02 12:38:42,371 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 12:38:42" (1/1) ... [2024-11-02 12:38:42,372 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 12:38:42" (1/1) ... [2024-11-02 12:38:42,375 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2024-11-02 12:38:42,376 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2024-11-02 12:38:42,376 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2024-11-02 12:38:42,376 INFO L274 PluginConnector]: RCFGBuilder initialized [2024-11-02 12:38:42,377 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 12:38:42" (1/1) ... [2024-11-02 12:38:42,385 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2024-11-02 12:38:42,397 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_44d5205a-1f1c-44ad-9d37-ea19cee96eca/bin/utaipan-verify-DbMuA5NWw2/z3 [2024-11-02 12:38:42,411 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_44d5205a-1f1c-44ad-9d37-ea19cee96eca/bin/utaipan-verify-DbMuA5NWw2/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2024-11-02 12:38:42,417 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_44d5205a-1f1c-44ad-9d37-ea19cee96eca/bin/utaipan-verify-DbMuA5NWw2/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2024-11-02 12:38:42,447 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2024-11-02 12:38:42,447 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2024-11-02 12:38:42,448 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2024-11-02 12:38:42,448 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2024-11-02 12:38:42,448 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2024-11-02 12:38:42,448 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2024-11-02 12:38:42,448 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2024-11-02 12:38:42,448 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~$Pointer$ [2024-11-02 12:38:42,449 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2024-11-02 12:38:42,449 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2024-11-02 12:38:42,449 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2024-11-02 12:38:42,626 INFO L238 CfgBuilder]: Building ICFG [2024-11-02 12:38:42,629 INFO L264 CfgBuilder]: Building CFG for each procedure with an implementation [2024-11-02 12:38:42,863 INFO L? ?]: Removed 31 outVars from TransFormulas that were not future-live. [2024-11-02 12:38:42,863 INFO L287 CfgBuilder]: Performing block encoding [2024-11-02 12:38:42,914 INFO L311 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2024-11-02 12:38:42,914 INFO L316 CfgBuilder]: Removed 3 assume(true) statements. [2024-11-02 12:38:42,914 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.11 12:38:42 BoogieIcfgContainer [2024-11-02 12:38:42,915 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2024-11-02 12:38:42,919 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2024-11-02 12:38:42,920 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2024-11-02 12:38:42,923 INFO L274 PluginConnector]: TraceAbstraction initialized [2024-11-02 12:38:42,923 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 02.11 12:38:41" (1/3) ... [2024-11-02 12:38:42,924 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5423f067 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.11 12:38:42, skipping insertion in model container [2024-11-02 12:38:42,925 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 02.11 12:38:42" (2/3) ... [2024-11-02 12:38:42,925 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@5423f067 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 02.11 12:38:42, skipping insertion in model container [2024-11-02 12:38:42,925 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 02.11 12:38:42" (3/3) ... [2024-11-02 12:38:42,927 INFO L112 eAbstractionObserver]: Analyzing ICFG sll2n_remove_all_reverse.i [2024-11-02 12:38:42,940 INFO L214 ceAbstractionStarter]: Automizer settings: Hoare:LoopHeads NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2024-11-02 12:38:42,940 INFO L154 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2024-11-02 12:38:42,995 INFO L332 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2024-11-02 12:38:43,001 INFO L333 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, mAutomataTypeConcurrency=FINITE_AUTOMATA, mHoareTripleChecks=INCREMENTAL, mHoareAnnotationPositions=LoopHeads, 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;@62200d7, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2024-11-02 12:38:43,002 INFO L334 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2024-11-02 12:38:43,006 INFO L276 IsEmpty]: Start isEmpty. Operand has 15 states, 13 states have (on average 1.6153846153846154) internal successors, (21), 14 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-02 12:38:43,012 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2024-11-02 12:38:43,013 INFO L207 NwaCegarLoop]: Found error trace [2024-11-02 12:38:43,013 INFO L215 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1] [2024-11-02 12:38:43,014 INFO L396 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-02 12:38:43,019 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-02 12:38:43,020 INFO L85 PathProgramCache]: Analyzing trace with hash 103250995, now seen corresponding path program 1 times [2024-11-02 12:38:43,028 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-02 12:38:43,029 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [84471708] [2024-11-02 12:38:43,029 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-02 12:38:43,029 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-02 12:38:43,133 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-02 12:38:43,279 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-02 12:38:43,279 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-02 12:38:43,280 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [84471708] [2024-11-02 12:38:43,281 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [84471708] provided 1 perfect and 0 imperfect interpolant sequences [2024-11-02 12:38:43,281 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2024-11-02 12:38:43,281 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2024-11-02 12:38:43,283 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1446821134] [2024-11-02 12:38:43,283 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2024-11-02 12:38:43,292 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2024-11-02 12:38:43,293 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-02 12:38:43,315 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2024-11-02 12:38:43,316 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2024-11-02 12:38:43,318 INFO L87 Difference]: Start difference. First operand has 15 states, 13 states have (on average 1.6153846153846154) internal successors, (21), 14 states have internal predecessors, (21), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Second operand has 3 states, 3 states have (on average 1.6666666666666667) internal successors, (5), 2 states have internal predecessors, (5), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-02 12:38:43,373 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-02 12:38:43,374 INFO L93 Difference]: Finished difference Result 29 states and 41 transitions. [2024-11-02 12:38:43,375 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2024-11-02 12:38:43,376 INFO L78 Accepts]: Start accepts. Automaton has has 3 states, 3 states have (on average 1.6666666666666667) internal successors, (5), 2 states have internal predecessors, (5), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 5 [2024-11-02 12:38:43,377 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-02 12:38:43,385 INFO L225 Difference]: With dead ends: 29 [2024-11-02 12:38:43,385 INFO L226 Difference]: Without dead ends: 14 [2024-11-02 12:38:43,388 INFO L431 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 [2024-11-02 12:38:43,393 INFO L432 NwaCegarLoop]: 12 mSDtfsCounter, 3 mSDsluCounter, 12 mSDsCounter, 0 mSdLazyCounter, 13 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 24 SdHoareTripleChecker+Invalid, 13 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 13 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2024-11-02 12:38:43,395 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [3 Valid, 24 Invalid, 13 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 13 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2024-11-02 12:38:43,414 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 14 states. [2024-11-02 12:38:43,426 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 14 to 13. [2024-11-02 12:38:43,428 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 13 states, 12 states have (on average 1.3333333333333333) internal successors, (16), 12 states have internal predecessors, (16), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-02 12:38:43,429 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 13 states to 13 states and 16 transitions. [2024-11-02 12:38:43,430 INFO L78 Accepts]: Start accepts. Automaton has 13 states and 16 transitions. Word has length 5 [2024-11-02 12:38:43,431 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-02 12:38:43,431 INFO L471 AbstractCegarLoop]: Abstraction has 13 states and 16 transitions. [2024-11-02 12:38:43,431 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 1.6666666666666667) internal successors, (5), 2 states have internal predecessors, (5), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-02 12:38:43,432 INFO L276 IsEmpty]: Start isEmpty. Operand 13 states and 16 transitions. [2024-11-02 12:38:43,432 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 8 [2024-11-02 12:38:43,432 INFO L207 NwaCegarLoop]: Found error trace [2024-11-02 12:38:43,433 INFO L215 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1] [2024-11-02 12:38:43,433 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2024-11-02 12:38:43,433 INFO L396 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-02 12:38:43,434 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-02 12:38:43,434 INFO L85 PathProgramCache]: Analyzing trace with hash -1683586183, now seen corresponding path program 1 times [2024-11-02 12:38:43,434 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-02 12:38:43,435 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1366437136] [2024-11-02 12:38:43,435 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-02 12:38:43,435 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-02 12:38:43,468 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-02 12:38:43,629 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-02 12:38:43,629 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-02 12:38:43,630 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1366437136] [2024-11-02 12:38:43,630 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1366437136] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-02 12:38:43,630 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1058986742] [2024-11-02 12:38:43,631 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-02 12:38:43,631 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-02 12:38:43,631 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_44d5205a-1f1c-44ad-9d37-ea19cee96eca/bin/utaipan-verify-DbMuA5NWw2/z3 [2024-11-02 12:38:43,634 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_44d5205a-1f1c-44ad-9d37-ea19cee96eca/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-02 12:38:43,636 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_44d5205a-1f1c-44ad-9d37-ea19cee96eca/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2024-11-02 12:38:43,789 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-02 12:38:43,792 INFO L255 TraceCheckSpWp]: Trace formula consists of 108 conjuncts, 4 conjuncts are in the unsatisfiable core [2024-11-02 12:38:43,799 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-02 12:38:43,861 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-02 12:38:43,863 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-02 12:38:43,901 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2024-11-02 12:38:43,901 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1058986742] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-02 12:38:43,902 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [615691609] [2024-11-02 12:38:43,929 INFO L159 IcfgInterpreter]: Started Sifa with 7 locations of interest [2024-11-02 12:38:43,929 INFO L166 IcfgInterpreter]: Building call graph [2024-11-02 12:38:43,934 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-02 12:38:43,940 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-02 12:38:43,941 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-02 12:38:44,804 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-02 12:38:45,030 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSifa [615691609] provided 1 perfect and 0 imperfect interpolant sequences [2024-11-02 12:38:45,030 INFO L185 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2024-11-02 12:38:45,030 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [3, 3, 3] total 7 [2024-11-02 12:38:45,032 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [287435112] [2024-11-02 12:38:45,032 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2024-11-02 12:38:45,033 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2024-11-02 12:38:45,033 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-02 12:38:45,034 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2024-11-02 12:38:45,034 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=38, Unknown=0, NotChecked=0, Total=56 [2024-11-02 12:38:45,035 INFO L87 Difference]: Start difference. First operand 13 states and 16 transitions. Second operand has 5 states, 5 states have (on average 1.4) internal successors, (7), 4 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-02 12:38:45,127 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-02 12:38:45,127 INFO L93 Difference]: Finished difference Result 22 states and 27 transitions. [2024-11-02 12:38:45,128 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2024-11-02 12:38:45,128 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 1.4) internal successors, (7), 4 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 7 [2024-11-02 12:38:45,129 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-02 12:38:45,129 INFO L225 Difference]: With dead ends: 22 [2024-11-02 12:38:45,130 INFO L226 Difference]: Without dead ends: 19 [2024-11-02 12:38:45,130 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 22 GetRequests, 14 SyntacticMatches, 2 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=18, Invalid=38, Unknown=0, NotChecked=0, Total=56 [2024-11-02 12:38:45,132 INFO L432 NwaCegarLoop]: 3 mSDtfsCounter, 5 mSDsluCounter, 6 mSDsCounter, 0 mSdLazyCounter, 34 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 9 SdHoareTripleChecker+Invalid, 36 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 34 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2024-11-02 12:38:45,133 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [5 Valid, 9 Invalid, 36 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 34 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2024-11-02 12:38:45,134 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2024-11-02 12:38:45,140 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 14. [2024-11-02 12:38:45,140 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 14 states, 13 states have (on average 1.3076923076923077) internal successors, (17), 13 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-02 12:38:45,141 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 17 transitions. [2024-11-02 12:38:45,142 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 17 transitions. Word has length 7 [2024-11-02 12:38:45,142 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-02 12:38:45,142 INFO L471 AbstractCegarLoop]: Abstraction has 14 states and 17 transitions. [2024-11-02 12:38:45,143 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 1.4) internal successors, (7), 4 states have internal predecessors, (7), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-02 12:38:45,143 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 17 transitions. [2024-11-02 12:38:45,143 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 11 [2024-11-02 12:38:45,143 INFO L207 NwaCegarLoop]: Found error trace [2024-11-02 12:38:45,144 INFO L215 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-02 12:38:45,166 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_44d5205a-1f1c-44ad-9d37-ea19cee96eca/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Ended with exit code 0 [2024-11-02 12:38:45,348 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_44d5205a-1f1c-44ad-9d37-ea19cee96eca/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable1 [2024-11-02 12:38:45,349 INFO L396 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-02 12:38:45,349 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-02 12:38:45,349 INFO L85 PathProgramCache]: Analyzing trace with hash -543845428, now seen corresponding path program 1 times [2024-11-02 12:38:45,349 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-02 12:38:45,350 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [534095352] [2024-11-02 12:38:45,350 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-02 12:38:45,350 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-02 12:38:45,391 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-02 12:38:45,538 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2024-11-02 12:38:45,539 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-02 12:38:45,539 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [534095352] [2024-11-02 12:38:45,540 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [534095352] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-02 12:38:45,543 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [573713160] [2024-11-02 12:38:45,543 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-02 12:38:45,543 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-02 12:38:45,543 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_44d5205a-1f1c-44ad-9d37-ea19cee96eca/bin/utaipan-verify-DbMuA5NWw2/z3 [2024-11-02 12:38:45,544 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_44d5205a-1f1c-44ad-9d37-ea19cee96eca/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-02 12:38:45,546 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_44d5205a-1f1c-44ad-9d37-ea19cee96eca/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2024-11-02 12:38:45,665 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-02 12:38:45,667 INFO L255 TraceCheckSpWp]: Trace formula consists of 146 conjuncts, 4 conjuncts are in the unsatisfiable core [2024-11-02 12:38:45,668 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-02 12:38:45,685 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2024-11-02 12:38:45,685 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-02 12:38:45,705 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2024-11-02 12:38:45,705 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [573713160] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-02 12:38:45,705 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [993608523] [2024-11-02 12:38:45,708 INFO L159 IcfgInterpreter]: Started Sifa with 9 locations of interest [2024-11-02 12:38:45,710 INFO L166 IcfgInterpreter]: Building call graph [2024-11-02 12:38:45,710 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-02 12:38:45,711 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-02 12:38:45,712 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-02 12:38:46,355 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-02 12:38:48,070 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSifa [993608523] provided 1 perfect and 0 imperfect interpolant sequences [2024-11-02 12:38:48,070 INFO L185 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2024-11-02 12:38:48,071 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [3, 3, 3] total 10 [2024-11-02 12:38:48,071 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1255405844] [2024-11-02 12:38:48,071 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2024-11-02 12:38:48,072 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2024-11-02 12:38:48,072 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-02 12:38:48,073 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2024-11-02 12:38:48,074 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=84, Unknown=0, NotChecked=0, Total=110 [2024-11-02 12:38:48,075 INFO L87 Difference]: Start difference. First operand 14 states and 17 transitions. Second operand has 8 states, 8 states have (on average 1.25) internal successors, (10), 7 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-02 12:38:50,516 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2024-11-02 12:38:52,521 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2024-11-02 12:38:52,621 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-02 12:38:52,621 INFO L93 Difference]: Finished difference Result 23 states and 28 transitions. [2024-11-02 12:38:52,622 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2024-11-02 12:38:52,623 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 1.25) internal successors, (10), 7 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 10 [2024-11-02 12:38:52,623 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-02 12:38:52,623 INFO L225 Difference]: With dead ends: 23 [2024-11-02 12:38:52,623 INFO L226 Difference]: Without dead ends: 20 [2024-11-02 12:38:52,624 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 31 GetRequests, 20 SyntacticMatches, 2 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 24 ImplicationChecksByTransitivity, 1.7s TimeCoverageRelationStatistics Valid=26, Invalid=84, Unknown=0, NotChecked=0, Total=110 [2024-11-02 12:38:52,625 INFO L432 NwaCegarLoop]: 3 mSDtfsCounter, 4 mSDsluCounter, 10 mSDsCounter, 0 mSdLazyCounter, 60 mSolverCounterSat, 0 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4 SdHoareTripleChecker+Valid, 13 SdHoareTripleChecker+Invalid, 62 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 60 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.5s IncrementalHoareTripleChecker+Time [2024-11-02 12:38:52,626 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [4 Valid, 13 Invalid, 62 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 60 Invalid, 2 Unknown, 0 Unchecked, 4.5s Time] [2024-11-02 12:38:52,627 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 20 states. [2024-11-02 12:38:52,629 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 20 to 16. [2024-11-02 12:38:52,630 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 16 states, 15 states have (on average 1.3333333333333333) internal successors, (20), 15 states have internal predecessors, (20), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-02 12:38:52,630 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 16 states to 16 states and 20 transitions. [2024-11-02 12:38:52,631 INFO L78 Accepts]: Start accepts. Automaton has 16 states and 20 transitions. Word has length 10 [2024-11-02 12:38:52,631 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-02 12:38:52,631 INFO L471 AbstractCegarLoop]: Abstraction has 16 states and 20 transitions. [2024-11-02 12:38:52,631 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 1.25) internal successors, (10), 7 states have internal predecessors, (10), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-02 12:38:52,631 INFO L276 IsEmpty]: Start isEmpty. Operand 16 states and 20 transitions. [2024-11-02 12:38:52,632 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 14 [2024-11-02 12:38:52,632 INFO L207 NwaCegarLoop]: Found error trace [2024-11-02 12:38:52,632 INFO L215 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-02 12:38:52,653 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_44d5205a-1f1c-44ad-9d37-ea19cee96eca/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Ended with exit code 0 [2024-11-02 12:38:52,833 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_44d5205a-1f1c-44ad-9d37-ea19cee96eca/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-02 12:38:52,833 INFO L396 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-02 12:38:52,834 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-02 12:38:52,834 INFO L85 PathProgramCache]: Analyzing trace with hash -551240874, now seen corresponding path program 1 times [2024-11-02 12:38:52,834 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-02 12:38:52,834 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2009541891] [2024-11-02 12:38:52,834 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-02 12:38:52,834 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-02 12:38:52,852 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-02 12:38:52,929 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2024-11-02 12:38:52,931 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-02 12:38:52,931 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2009541891] [2024-11-02 12:38:52,932 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2009541891] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-02 12:38:52,932 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1770220863] [2024-11-02 12:38:52,932 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-02 12:38:52,932 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-02 12:38:52,933 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_44d5205a-1f1c-44ad-9d37-ea19cee96eca/bin/utaipan-verify-DbMuA5NWw2/z3 [2024-11-02 12:38:52,935 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_44d5205a-1f1c-44ad-9d37-ea19cee96eca/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-02 12:38:52,936 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_44d5205a-1f1c-44ad-9d37-ea19cee96eca/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2024-11-02 12:38:53,053 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-02 12:38:53,056 INFO L255 TraceCheckSpWp]: Trace formula consists of 159 conjuncts, 4 conjuncts are in the unsatisfiable core [2024-11-02 12:38:53,058 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-02 12:38:53,080 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2024-11-02 12:38:53,081 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-02 12:38:53,112 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2024-11-02 12:38:53,112 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1770220863] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-02 12:38:53,113 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [671420294] [2024-11-02 12:38:53,117 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2024-11-02 12:38:53,118 INFO L166 IcfgInterpreter]: Building call graph [2024-11-02 12:38:53,119 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-02 12:38:53,119 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-02 12:38:53,120 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-02 12:38:53,550 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-02 12:38:53,911 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSifa [671420294] provided 1 perfect and 0 imperfect interpolant sequences [2024-11-02 12:38:53,911 INFO L185 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2024-11-02 12:38:53,911 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [3, 3, 3] total 10 [2024-11-02 12:38:53,912 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [492038385] [2024-11-02 12:38:53,912 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2024-11-02 12:38:53,912 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2024-11-02 12:38:53,912 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-02 12:38:53,913 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2024-11-02 12:38:53,913 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=82, Unknown=0, NotChecked=0, Total=110 [2024-11-02 12:38:53,913 INFO L87 Difference]: Start difference. First operand 16 states and 20 transitions. Second operand has 8 states, 8 states have (on average 1.625) internal successors, (13), 7 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-02 12:38:54,029 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-02 12:38:54,030 INFO L93 Difference]: Finished difference Result 34 states and 43 transitions. [2024-11-02 12:38:54,030 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2024-11-02 12:38:54,031 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 1.625) internal successors, (13), 7 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 13 [2024-11-02 12:38:54,031 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-02 12:38:54,031 INFO L225 Difference]: With dead ends: 34 [2024-11-02 12:38:54,031 INFO L226 Difference]: Without dead ends: 25 [2024-11-02 12:38:54,032 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 40 GetRequests, 29 SyntacticMatches, 2 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 0.4s TimeCoverageRelationStatistics Valid=28, Invalid=82, Unknown=0, NotChecked=0, Total=110 [2024-11-02 12:38:54,033 INFO L432 NwaCegarLoop]: 3 mSDtfsCounter, 4 mSDsluCounter, 8 mSDsCounter, 0 mSdLazyCounter, 47 mSolverCounterSat, 2 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4 SdHoareTripleChecker+Valid, 11 SdHoareTripleChecker+Invalid, 49 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 2 IncrementalHoareTripleChecker+Valid, 47 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2024-11-02 12:38:54,033 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [4 Valid, 11 Invalid, 49 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [2 Valid, 47 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2024-11-02 12:38:54,034 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 25 states. [2024-11-02 12:38:54,038 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 25 to 20. [2024-11-02 12:38:54,038 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 20 states, 19 states have (on average 1.3157894736842106) internal successors, (25), 19 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-02 12:38:54,039 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 20 states to 20 states and 25 transitions. [2024-11-02 12:38:54,039 INFO L78 Accepts]: Start accepts. Automaton has 20 states and 25 transitions. Word has length 13 [2024-11-02 12:38:54,040 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-02 12:38:54,040 INFO L471 AbstractCegarLoop]: Abstraction has 20 states and 25 transitions. [2024-11-02 12:38:54,040 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 1.625) internal successors, (13), 7 states have internal predecessors, (13), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-02 12:38:54,040 INFO L276 IsEmpty]: Start isEmpty. Operand 20 states and 25 transitions. [2024-11-02 12:38:54,041 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 16 [2024-11-02 12:38:54,041 INFO L207 NwaCegarLoop]: Found error trace [2024-11-02 12:38:54,041 INFO L215 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-02 12:38:54,060 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_44d5205a-1f1c-44ad-9d37-ea19cee96eca/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Ended with exit code 0 [2024-11-02 12:38:54,245 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_44d5205a-1f1c-44ad-9d37-ea19cee96eca/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable3 [2024-11-02 12:38:54,246 INFO L396 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-02 12:38:54,247 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-02 12:38:54,247 INFO L85 PathProgramCache]: Analyzing trace with hash 1653622641, now seen corresponding path program 1 times [2024-11-02 12:38:54,247 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-02 12:38:54,247 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1316113391] [2024-11-02 12:38:54,247 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-02 12:38:54,248 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-02 12:38:54,272 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-02 12:38:54,379 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2024-11-02 12:38:54,379 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-02 12:38:54,379 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1316113391] [2024-11-02 12:38:54,380 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1316113391] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-02 12:38:54,380 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1723628766] [2024-11-02 12:38:54,380 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-02 12:38:54,380 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-02 12:38:54,380 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_44d5205a-1f1c-44ad-9d37-ea19cee96eca/bin/utaipan-verify-DbMuA5NWw2/z3 [2024-11-02 12:38:54,381 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_44d5205a-1f1c-44ad-9d37-ea19cee96eca/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-02 12:38:54,382 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_44d5205a-1f1c-44ad-9d37-ea19cee96eca/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2024-11-02 12:38:54,482 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-02 12:38:54,484 INFO L255 TraceCheckSpWp]: Trace formula consists of 172 conjuncts, 4 conjuncts are in the unsatisfiable core [2024-11-02 12:38:54,485 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-02 12:38:54,508 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2024-11-02 12:38:54,509 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-02 12:38:54,542 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2024-11-02 12:38:54,543 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1723628766] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-02 12:38:54,543 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1974637919] [2024-11-02 12:38:54,545 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2024-11-02 12:38:54,545 INFO L166 IcfgInterpreter]: Building call graph [2024-11-02 12:38:54,546 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-02 12:38:54,546 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-02 12:38:54,546 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-02 12:38:58,003 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-02 12:38:58,360 WARN L873 $PredicateComparison]: unable to prove that (or (and (= |c_ULTIMATE.start_main_~#s~0#1.offset| 0) (<= 1 |c_#StackHeapBarrier|) (<= 2 |c_ULTIMATE.start_main_~#s~0#1.base|) (= (select (select |c_#memory_$Pointer$.offset| |c_ULTIMATE.start_main_~#s~0#1.base|) 0) 0) (= |c_ULTIMATE.start_main_~i~0#1| 1)) (exists ((|v_ULTIMATE.start_sll_remove_last_~last~0#1.offset_38| Int) (|v_ULTIMATE.start_sll_remove_last_~last~0#1.base_38| Int) (|v_#memory_$Pointer$.base_71| (Array Int (Array Int Int))) (|v_ULTIMATE.start_sll_remove_last_~snd_to_last~0#1.offset_34| Int) (|v_#valid_52| (Array Int Int)) (|v_#memory_int_68| (Array Int (Array Int Int))) (|v_ULTIMATE.start_sll_remove_last_~snd_to_last~0#1.base_33| Int) (|v_#memory_$Pointer$.offset_71| (Array Int (Array Int Int)))) (let ((.cse0 (+ |v_ULTIMATE.start_sll_remove_last_~snd_to_last~0#1.offset_34| 4))) (and (= (store |v_#memory_$Pointer$.offset_71| |v_ULTIMATE.start_sll_remove_last_~snd_to_last~0#1.base_33| (store (select |v_#memory_$Pointer$.offset_71| |v_ULTIMATE.start_sll_remove_last_~snd_to_last~0#1.base_33|) .cse0 0)) |c_#memory_$Pointer$.offset|) (= |c_#valid| (store |v_#valid_52| |v_ULTIMATE.start_sll_remove_last_~last~0#1.base_38| 0)) (= (store |v_#memory_int_68| |v_ULTIMATE.start_sll_remove_last_~snd_to_last~0#1.base_33| (store (select |v_#memory_int_68| |v_ULTIMATE.start_sll_remove_last_~snd_to_last~0#1.base_33|) .cse0 (select (select |c_#memory_int| |v_ULTIMATE.start_sll_remove_last_~snd_to_last~0#1.base_33|) .cse0))) |c_#memory_int|) (let ((.cse6 (+ |v_ULTIMATE.start_sll_remove_last_~last~0#1.offset_38| 4))) (let ((.cse4 (= (select (select |v_#memory_$Pointer$.base_71| |v_ULTIMATE.start_sll_remove_last_~last~0#1.base_38|) .cse6) 0)) (.cse5 (= (select (select |v_#memory_$Pointer$.offset_71| |v_ULTIMATE.start_sll_remove_last_~last~0#1.base_38|) .cse6) 0))) (or (and (exists ((|v_ULTIMATE.start_sll_remove_last_~head#1.offset_23| Int) (|v_ULTIMATE.start_sll_remove_last_~head#1.base_23| Int)) (let ((.cse1 (select (select |v_#memory_$Pointer$.base_71| |v_ULTIMATE.start_sll_remove_last_~head#1.base_23|) |v_ULTIMATE.start_sll_remove_last_~head#1.offset_23|))) (let ((.cse2 (select (select |v_#memory_$Pointer$.base_71| .cse1) .cse0)) (.cse3 (select (select |v_#memory_$Pointer$.offset_71| .cse1) .cse0))) (and (= .cse1 |v_ULTIMATE.start_sll_remove_last_~snd_to_last~0#1.base_33|) (or (not (= .cse2 0)) (not (= .cse3 0))) (= |v_ULTIMATE.start_sll_remove_last_~last~0#1.base_38| .cse2) (= |v_ULTIMATE.start_sll_remove_last_~snd_to_last~0#1.offset_34| (select (select |v_#memory_$Pointer$.offset_71| |v_ULTIMATE.start_sll_remove_last_~head#1.base_23|) |v_ULTIMATE.start_sll_remove_last_~head#1.offset_23|)) (= |v_ULTIMATE.start_sll_remove_last_~last~0#1.offset_38| .cse3))))) .cse4 .cse5) (and .cse4 (= |v_ULTIMATE.start_sll_remove_last_~snd_to_last~0#1.offset_34| 0) (= |v_ULTIMATE.start_sll_remove_last_~snd_to_last~0#1.base_33| 0) (exists ((|v_ULTIMATE.start_sll_remove_last_~head#1.offset_23| Int) (|v_ULTIMATE.start_sll_remove_last_~head#1.base_23| Int)) (and (= (select (select |v_#memory_$Pointer$.base_71| |v_ULTIMATE.start_sll_remove_last_~head#1.base_23|) |v_ULTIMATE.start_sll_remove_last_~head#1.offset_23|) |v_ULTIMATE.start_sll_remove_last_~last~0#1.base_38|) (= |v_ULTIMATE.start_sll_remove_last_~last~0#1.offset_38| (select (select |v_#memory_$Pointer$.offset_71| |v_ULTIMATE.start_sll_remove_last_~head#1.base_23|) |v_ULTIMATE.start_sll_remove_last_~head#1.offset_23|)))) .cse5)))) (= |c_#memory_$Pointer$.base| (store |v_#memory_$Pointer$.base_71| |v_ULTIMATE.start_sll_remove_last_~snd_to_last~0#1.base_33| (store (select |v_#memory_$Pointer$.base_71| |v_ULTIMATE.start_sll_remove_last_~snd_to_last~0#1.base_33|) .cse0 0))))))) is different from true [2024-11-02 12:38:58,717 WARN L873 $PredicateComparison]: unable to prove that (exists ((|v_ULTIMATE.start_sll_remove_last_~last~0#1.offset_38| Int) (|v_ULTIMATE.start_sll_remove_last_~last~0#1.base_38| Int) (|v_#memory_$Pointer$.base_71| (Array Int (Array Int Int))) (|v_ULTIMATE.start_sll_remove_last_~snd_to_last~0#1.offset_34| Int) (|v_#valid_52| (Array Int Int)) (|v_#memory_int_68| (Array Int (Array Int Int))) (|v_ULTIMATE.start_sll_remove_last_~snd_to_last~0#1.base_33| Int) (|v_#memory_$Pointer$.offset_71| (Array Int (Array Int Int)))) (let ((.cse0 (+ |v_ULTIMATE.start_sll_remove_last_~snd_to_last~0#1.offset_34| 4))) (and (= (store |v_#memory_$Pointer$.offset_71| |v_ULTIMATE.start_sll_remove_last_~snd_to_last~0#1.base_33| (store (select |v_#memory_$Pointer$.offset_71| |v_ULTIMATE.start_sll_remove_last_~snd_to_last~0#1.base_33|) .cse0 0)) |c_#memory_$Pointer$.offset|) (= |c_#valid| (store |v_#valid_52| |v_ULTIMATE.start_sll_remove_last_~last~0#1.base_38| 0)) (= (store |v_#memory_int_68| |v_ULTIMATE.start_sll_remove_last_~snd_to_last~0#1.base_33| (store (select |v_#memory_int_68| |v_ULTIMATE.start_sll_remove_last_~snd_to_last~0#1.base_33|) .cse0 (select (select |c_#memory_int| |v_ULTIMATE.start_sll_remove_last_~snd_to_last~0#1.base_33|) .cse0))) |c_#memory_int|) (let ((.cse6 (+ |v_ULTIMATE.start_sll_remove_last_~last~0#1.offset_38| 4))) (let ((.cse4 (= (select (select |v_#memory_$Pointer$.base_71| |v_ULTIMATE.start_sll_remove_last_~last~0#1.base_38|) .cse6) 0)) (.cse5 (= (select (select |v_#memory_$Pointer$.offset_71| |v_ULTIMATE.start_sll_remove_last_~last~0#1.base_38|) .cse6) 0))) (or (and (exists ((|v_ULTIMATE.start_sll_remove_last_~head#1.offset_23| Int) (|v_ULTIMATE.start_sll_remove_last_~head#1.base_23| Int)) (let ((.cse1 (select (select |v_#memory_$Pointer$.base_71| |v_ULTIMATE.start_sll_remove_last_~head#1.base_23|) |v_ULTIMATE.start_sll_remove_last_~head#1.offset_23|))) (let ((.cse2 (select (select |v_#memory_$Pointer$.base_71| .cse1) .cse0)) (.cse3 (select (select |v_#memory_$Pointer$.offset_71| .cse1) .cse0))) (and (= .cse1 |v_ULTIMATE.start_sll_remove_last_~snd_to_last~0#1.base_33|) (or (not (= .cse2 0)) (not (= .cse3 0))) (= |v_ULTIMATE.start_sll_remove_last_~last~0#1.base_38| .cse2) (= |v_ULTIMATE.start_sll_remove_last_~snd_to_last~0#1.offset_34| (select (select |v_#memory_$Pointer$.offset_71| |v_ULTIMATE.start_sll_remove_last_~head#1.base_23|) |v_ULTIMATE.start_sll_remove_last_~head#1.offset_23|)) (= |v_ULTIMATE.start_sll_remove_last_~last~0#1.offset_38| .cse3))))) .cse4 .cse5) (and .cse4 (= |v_ULTIMATE.start_sll_remove_last_~snd_to_last~0#1.offset_34| 0) (= |v_ULTIMATE.start_sll_remove_last_~snd_to_last~0#1.base_33| 0) (exists ((|v_ULTIMATE.start_sll_remove_last_~head#1.offset_23| Int) (|v_ULTIMATE.start_sll_remove_last_~head#1.base_23| Int)) (and (= (select (select |v_#memory_$Pointer$.base_71| |v_ULTIMATE.start_sll_remove_last_~head#1.base_23|) |v_ULTIMATE.start_sll_remove_last_~head#1.offset_23|) |v_ULTIMATE.start_sll_remove_last_~last~0#1.base_38|) (= |v_ULTIMATE.start_sll_remove_last_~last~0#1.offset_38| (select (select |v_#memory_$Pointer$.offset_71| |v_ULTIMATE.start_sll_remove_last_~head#1.base_23|) |v_ULTIMATE.start_sll_remove_last_~head#1.offset_23|)))) .cse5)))) (= |c_#memory_$Pointer$.base| (store |v_#memory_$Pointer$.base_71| |v_ULTIMATE.start_sll_remove_last_~snd_to_last~0#1.base_33| (store (select |v_#memory_$Pointer$.base_71| |v_ULTIMATE.start_sll_remove_last_~snd_to_last~0#1.base_33|) .cse0 0)))))) is different from true [2024-11-02 12:38:58,735 WARN L873 $PredicateComparison]: unable to prove that (and (exists ((|v_ULTIMATE.start_main_~#s~0#1.offset_26| Int)) (and (= |c_ULTIMATE.start_main_#t~mem14#1.offset| (select (select |c_#memory_$Pointer$.offset| |c_ULTIMATE.start_main_~#s~0#1.base|) |v_ULTIMATE.start_main_~#s~0#1.offset_26|)) (= |c_ULTIMATE.start_main_#t~mem14#1.base| (select (select |c_#memory_$Pointer$.base| |c_ULTIMATE.start_main_~#s~0#1.base|) |v_ULTIMATE.start_main_~#s~0#1.offset_26|)))) (exists ((|v_ULTIMATE.start_sll_remove_last_~last~0#1.offset_38| Int) (|v_ULTIMATE.start_sll_remove_last_~last~0#1.base_38| Int) (|v_#memory_$Pointer$.base_71| (Array Int (Array Int Int))) (|v_ULTIMATE.start_sll_remove_last_~snd_to_last~0#1.offset_34| Int) (|v_#valid_52| (Array Int Int)) (|v_#memory_int_68| (Array Int (Array Int Int))) (|v_ULTIMATE.start_sll_remove_last_~snd_to_last~0#1.base_33| Int) (|v_#memory_$Pointer$.offset_71| (Array Int (Array Int Int)))) (let ((.cse0 (+ |v_ULTIMATE.start_sll_remove_last_~snd_to_last~0#1.offset_34| 4))) (and (= (store |v_#memory_$Pointer$.offset_71| |v_ULTIMATE.start_sll_remove_last_~snd_to_last~0#1.base_33| (store (select |v_#memory_$Pointer$.offset_71| |v_ULTIMATE.start_sll_remove_last_~snd_to_last~0#1.base_33|) .cse0 0)) |c_#memory_$Pointer$.offset|) (= |c_#valid| (store |v_#valid_52| |v_ULTIMATE.start_sll_remove_last_~last~0#1.base_38| 0)) (= (store |v_#memory_int_68| |v_ULTIMATE.start_sll_remove_last_~snd_to_last~0#1.base_33| (store (select |v_#memory_int_68| |v_ULTIMATE.start_sll_remove_last_~snd_to_last~0#1.base_33|) .cse0 (select (select |c_#memory_int| |v_ULTIMATE.start_sll_remove_last_~snd_to_last~0#1.base_33|) .cse0))) |c_#memory_int|) (let ((.cse6 (+ |v_ULTIMATE.start_sll_remove_last_~last~0#1.offset_38| 4))) (let ((.cse4 (= (select (select |v_#memory_$Pointer$.base_71| |v_ULTIMATE.start_sll_remove_last_~last~0#1.base_38|) .cse6) 0)) (.cse5 (= (select (select |v_#memory_$Pointer$.offset_71| |v_ULTIMATE.start_sll_remove_last_~last~0#1.base_38|) .cse6) 0))) (or (and (exists ((|v_ULTIMATE.start_sll_remove_last_~head#1.offset_23| Int) (|v_ULTIMATE.start_sll_remove_last_~head#1.base_23| Int)) (let ((.cse1 (select (select |v_#memory_$Pointer$.base_71| |v_ULTIMATE.start_sll_remove_last_~head#1.base_23|) |v_ULTIMATE.start_sll_remove_last_~head#1.offset_23|))) (let ((.cse2 (select (select |v_#memory_$Pointer$.base_71| .cse1) .cse0)) (.cse3 (select (select |v_#memory_$Pointer$.offset_71| .cse1) .cse0))) (and (= .cse1 |v_ULTIMATE.start_sll_remove_last_~snd_to_last~0#1.base_33|) (or (not (= .cse2 0)) (not (= .cse3 0))) (= |v_ULTIMATE.start_sll_remove_last_~last~0#1.base_38| .cse2) (= |v_ULTIMATE.start_sll_remove_last_~snd_to_last~0#1.offset_34| (select (select |v_#memory_$Pointer$.offset_71| |v_ULTIMATE.start_sll_remove_last_~head#1.base_23|) |v_ULTIMATE.start_sll_remove_last_~head#1.offset_23|)) (= |v_ULTIMATE.start_sll_remove_last_~last~0#1.offset_38| .cse3))))) .cse4 .cse5) (and .cse4 (= |v_ULTIMATE.start_sll_remove_last_~snd_to_last~0#1.offset_34| 0) (= |v_ULTIMATE.start_sll_remove_last_~snd_to_last~0#1.base_33| 0) (exists ((|v_ULTIMATE.start_sll_remove_last_~head#1.offset_23| Int) (|v_ULTIMATE.start_sll_remove_last_~head#1.base_23| Int)) (and (= (select (select |v_#memory_$Pointer$.base_71| |v_ULTIMATE.start_sll_remove_last_~head#1.base_23|) |v_ULTIMATE.start_sll_remove_last_~head#1.offset_23|) |v_ULTIMATE.start_sll_remove_last_~last~0#1.base_38|) (= |v_ULTIMATE.start_sll_remove_last_~last~0#1.offset_38| (select (select |v_#memory_$Pointer$.offset_71| |v_ULTIMATE.start_sll_remove_last_~head#1.base_23|) |v_ULTIMATE.start_sll_remove_last_~head#1.offset_23|)))) .cse5)))) (= |c_#memory_$Pointer$.base| (store |v_#memory_$Pointer$.base_71| |v_ULTIMATE.start_sll_remove_last_~snd_to_last~0#1.base_33| (store (select |v_#memory_$Pointer$.base_71| |v_ULTIMATE.start_sll_remove_last_~snd_to_last~0#1.base_33|) .cse0 0))))))) is different from true [2024-11-02 12:38:58,737 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '525#(and (exists ((|v_ULTIMATE.start_sll_remove_last_~last~0#1.offset_38| Int) (|v_ULTIMATE.start_sll_remove_last_~last~0#1.base_38| Int) (|v_#memory_$Pointer$.base_71| (Array Int (Array Int Int))) (|v_ULTIMATE.start_sll_remove_last_~snd_to_last~0#1.offset_34| Int) (|v_#valid_52| (Array Int Int)) (|v_#memory_int_68| (Array Int (Array Int Int))) (|v_ULTIMATE.start_sll_remove_last_~snd_to_last~0#1.base_33| Int) (|v_#memory_$Pointer$.offset_71| (Array Int (Array Int Int)))) (and (= |#memory_int| (store |v_#memory_int_68| |v_ULTIMATE.start_sll_remove_last_~snd_to_last~0#1.base_33| (store (select |v_#memory_int_68| |v_ULTIMATE.start_sll_remove_last_~snd_to_last~0#1.base_33|) (+ |v_ULTIMATE.start_sll_remove_last_~snd_to_last~0#1.offset_34| 4) (select (select |#memory_int| |v_ULTIMATE.start_sll_remove_last_~snd_to_last~0#1.base_33|) (+ |v_ULTIMATE.start_sll_remove_last_~snd_to_last~0#1.offset_34| 4))))) (= |#memory_$Pointer$.offset| (store |v_#memory_$Pointer$.offset_71| |v_ULTIMATE.start_sll_remove_last_~snd_to_last~0#1.base_33| (store (select |v_#memory_$Pointer$.offset_71| |v_ULTIMATE.start_sll_remove_last_~snd_to_last~0#1.base_33|) (+ |v_ULTIMATE.start_sll_remove_last_~snd_to_last~0#1.offset_34| 4) 0))) (= (store |v_#memory_$Pointer$.base_71| |v_ULTIMATE.start_sll_remove_last_~snd_to_last~0#1.base_33| (store (select |v_#memory_$Pointer$.base_71| |v_ULTIMATE.start_sll_remove_last_~snd_to_last~0#1.base_33|) (+ |v_ULTIMATE.start_sll_remove_last_~snd_to_last~0#1.offset_34| 4) 0)) |#memory_$Pointer$.base|) (or (and (exists ((|v_ULTIMATE.start_sll_remove_last_~head#1.offset_23| Int) (|v_ULTIMATE.start_sll_remove_last_~head#1.base_23| Int)) (and (= (select (select |v_#memory_$Pointer$.base_71| |v_ULTIMATE.start_sll_remove_last_~head#1.base_23|) |v_ULTIMATE.start_sll_remove_last_~head#1.offset_23|) |v_ULTIMATE.start_sll_remove_last_~snd_to_last~0#1.base_33|) (or (not (= (select (select |v_#memory_$Pointer$.base_71| (select (select |v_#memory_$Pointer$.base_71| |v_ULTIMATE.start_sll_remove_last_~head#1.base_23|) |v_ULTIMATE.start_sll_remove_last_~head#1.offset_23|)) (+ |v_ULTIMATE.start_sll_remove_last_~snd_to_last~0#1.offset_34| 4)) 0)) (not (= (select (select |v_#memory_$Pointer$.offset_71| (select (select |v_#memory_$Pointer$.base_71| |v_ULTIMATE.start_sll_remove_last_~head#1.base_23|) |v_ULTIMATE.start_sll_remove_last_~head#1.offset_23|)) (+ |v_ULTIMATE.start_sll_remove_last_~snd_to_last~0#1.offset_34| 4)) 0))) (= |v_ULTIMATE.start_sll_remove_last_~last~0#1.base_38| (select (select |v_#memory_$Pointer$.base_71| (select (select |v_#memory_$Pointer$.base_71| |v_ULTIMATE.start_sll_remove_last_~head#1.base_23|) |v_ULTIMATE.start_sll_remove_last_~head#1.offset_23|)) (+ |v_ULTIMATE.start_sll_remove_last_~snd_to_last~0#1.offset_34| 4))) (= |v_ULTIMATE.start_sll_remove_last_~snd_to_last~0#1.offset_34| (select (select |v_#memory_$Pointer$.offset_71| |v_ULTIMATE.start_sll_remove_last_~head#1.base_23|) |v_ULTIMATE.start_sll_remove_last_~head#1.offset_23|)) (= |v_ULTIMATE.start_sll_remove_last_~last~0#1.offset_38| (select (select |v_#memory_$Pointer$.offset_71| (select (select |v_#memory_$Pointer$.base_71| |v_ULTIMATE.start_sll_remove_last_~head#1.base_23|) |v_ULTIMATE.start_sll_remove_last_~head#1.offset_23|)) (+ |v_ULTIMATE.start_sll_remove_last_~snd_to_last~0#1.offset_34| 4))))) (= (select (select |v_#memory_$Pointer$.base_71| |v_ULTIMATE.start_sll_remove_last_~last~0#1.base_38|) (+ |v_ULTIMATE.start_sll_remove_last_~last~0#1.offset_38| 4)) 0) (= (select (select |v_#memory_$Pointer$.offset_71| |v_ULTIMATE.start_sll_remove_last_~last~0#1.base_38|) (+ |v_ULTIMATE.start_sll_remove_last_~last~0#1.offset_38| 4)) 0)) (and (= (select (select |v_#memory_$Pointer$.base_71| |v_ULTIMATE.start_sll_remove_last_~last~0#1.base_38|) (+ |v_ULTIMATE.start_sll_remove_last_~last~0#1.offset_38| 4)) 0) (= |v_ULTIMATE.start_sll_remove_last_~snd_to_last~0#1.offset_34| 0) (= |v_ULTIMATE.start_sll_remove_last_~snd_to_last~0#1.base_33| 0) (exists ((|v_ULTIMATE.start_sll_remove_last_~head#1.offset_23| Int) (|v_ULTIMATE.start_sll_remove_last_~head#1.base_23| Int)) (and (= (select (select |v_#memory_$Pointer$.base_71| |v_ULTIMATE.start_sll_remove_last_~head#1.base_23|) |v_ULTIMATE.start_sll_remove_last_~head#1.offset_23|) |v_ULTIMATE.start_sll_remove_last_~last~0#1.base_38|) (= |v_ULTIMATE.start_sll_remove_last_~last~0#1.offset_38| (select (select |v_#memory_$Pointer$.offset_71| |v_ULTIMATE.start_sll_remove_last_~head#1.base_23|) |v_ULTIMATE.start_sll_remove_last_~head#1.offset_23|)))) (= (select (select |v_#memory_$Pointer$.offset_71| |v_ULTIMATE.start_sll_remove_last_~last~0#1.base_38|) (+ |v_ULTIMATE.start_sll_remove_last_~last~0#1.offset_38| 4)) 0))) (= (store |v_#valid_52| |v_ULTIMATE.start_sll_remove_last_~last~0#1.base_38| 0) |#valid|))) (or (exists ((|v_ULTIMATE.start_main_~#s~0#1.offset_26| Int)) (not (= (select (select |#memory_$Pointer$.base| |ULTIMATE.start_main_~#s~0#1.base|) |v_ULTIMATE.start_main_~#s~0#1.offset_26|) 0))) (exists ((|v_ULTIMATE.start_main_~#s~0#1.offset_26| Int)) (not (= (select (select |#memory_$Pointer$.offset| |ULTIMATE.start_main_~#s~0#1.base|) |v_ULTIMATE.start_main_~#s~0#1.offset_26|) 0)))))' at error location [2024-11-02 12:38:58,737 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-02 12:38:58,737 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-02 12:38:58,737 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3, 3] total 4 [2024-11-02 12:38:58,738 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [641279043] [2024-11-02 12:38:58,738 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-02 12:38:58,741 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2024-11-02 12:38:58,741 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-02 12:38:58,742 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2024-11-02 12:38:58,742 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=32, Invalid=83, Unknown=7, NotChecked=60, Total=182 [2024-11-02 12:38:58,743 INFO L87 Difference]: Start difference. First operand 20 states and 25 transitions. Second operand has 5 states, 5 states have (on average 3.4) internal successors, (17), 4 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-02 12:38:58,811 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-02 12:38:58,811 INFO L93 Difference]: Finished difference Result 38 states and 48 transitions. [2024-11-02 12:38:58,812 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2024-11-02 12:38:58,812 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 3.4) internal successors, (17), 4 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 15 [2024-11-02 12:38:58,813 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-02 12:38:58,814 INFO L225 Difference]: With dead ends: 38 [2024-11-02 12:38:58,814 INFO L226 Difference]: Without dead ends: 22 [2024-11-02 12:38:58,815 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 46 GetRequests, 32 SyntacticMatches, 2 SemanticMatches, 12 ConstructedPredicates, 3 IntricatePredicates, 0 DeprecatedPredicates, 19 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=32, Invalid=83, Unknown=7, NotChecked=60, Total=182 [2024-11-02 12:38:58,816 INFO L432 NwaCegarLoop]: 9 mSDtfsCounter, 1 mSDsluCounter, 27 mSDsCounter, 0 mSdLazyCounter, 20 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 1 SdHoareTripleChecker+Valid, 36 SdHoareTripleChecker+Invalid, 21 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 20 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2024-11-02 12:38:58,817 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [1 Valid, 36 Invalid, 21 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 20 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2024-11-02 12:38:58,820 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 22 states. [2024-11-02 12:38:58,826 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 22 to 22. [2024-11-02 12:38:58,826 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 22 states, 21 states have (on average 1.2857142857142858) internal successors, (27), 21 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-02 12:38:58,827 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 22 states to 22 states and 27 transitions. [2024-11-02 12:38:58,828 INFO L78 Accepts]: Start accepts. Automaton has 22 states and 27 transitions. Word has length 15 [2024-11-02 12:38:58,828 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-02 12:38:58,828 INFO L471 AbstractCegarLoop]: Abstraction has 22 states and 27 transitions. [2024-11-02 12:38:58,828 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 3.4) internal successors, (17), 4 states have internal predecessors, (17), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-02 12:38:58,829 INFO L276 IsEmpty]: Start isEmpty. Operand 22 states and 27 transitions. [2024-11-02 12:38:58,830 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 18 [2024-11-02 12:38:58,830 INFO L207 NwaCegarLoop]: Found error trace [2024-11-02 12:38:58,830 INFO L215 NwaCegarLoop]: trace histogram [2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-02 12:38:58,854 INFO L552 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_44d5205a-1f1c-44ad-9d37-ea19cee96eca/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Ended with exit code 0 [2024-11-02 12:38:59,033 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_44d5205a-1f1c-44ad-9d37-ea19cee96eca/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-02 12:38:59,034 INFO L396 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-02 12:38:59,034 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-02 12:38:59,034 INFO L85 PathProgramCache]: Analyzing trace with hash 1555787575, now seen corresponding path program 2 times [2024-11-02 12:38:59,034 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-02 12:38:59,034 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1940987815] [2024-11-02 12:38:59,034 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-02 12:38:59,035 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-02 12:38:59,061 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-02 12:38:59,151 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2024-11-02 12:38:59,151 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-02 12:38:59,151 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1940987815] [2024-11-02 12:38:59,151 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1940987815] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-02 12:38:59,152 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [264594346] [2024-11-02 12:38:59,152 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2024-11-02 12:38:59,152 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-02 12:38:59,152 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_44d5205a-1f1c-44ad-9d37-ea19cee96eca/bin/utaipan-verify-DbMuA5NWw2/z3 [2024-11-02 12:38:59,154 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_44d5205a-1f1c-44ad-9d37-ea19cee96eca/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-02 12:38:59,155 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_44d5205a-1f1c-44ad-9d37-ea19cee96eca/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2024-11-02 12:38:59,301 INFO L227 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2024-11-02 12:38:59,301 INFO L228 tOrderPrioritization]: Conjunction of SSA is unsat [2024-11-02 12:38:59,302 INFO L255 TraceCheckSpWp]: Trace formula consists of 159 conjuncts, 4 conjuncts are in the unsatisfiable core [2024-11-02 12:38:59,303 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-02 12:38:59,362 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2024-11-02 12:38:59,362 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-02 12:38:59,407 INFO L134 CoverageAnalysis]: Checked inductivity of 7 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2024-11-02 12:38:59,407 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [264594346] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-02 12:38:59,407 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1002996553] [2024-11-02 12:38:59,409 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2024-11-02 12:38:59,409 INFO L166 IcfgInterpreter]: Building call graph [2024-11-02 12:38:59,410 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-02 12:38:59,410 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-02 12:38:59,410 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-02 12:39:00,320 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-02 12:39:02,771 WARN L873 $PredicateComparison]: unable to prove that (and (exists ((|v_#memory_$Pointer$.base_86| (Array Int (Array Int Int))) (|v_#memory_$Pointer$.offset_86| (Array Int (Array Int Int))) (|v_ULTIMATE.start_sll_remove_last_~snd_to_last~0#1.base_51| Int) (|v_ULTIMATE.start_sll_remove_last_~snd_to_last~0#1.offset_53| Int) (|v_#memory_int_83| (Array Int (Array Int Int)))) (let ((.cse0 (+ |v_ULTIMATE.start_sll_remove_last_~snd_to_last~0#1.offset_53| 4))) (and (= |c_#memory_int| (store |v_#memory_int_83| |v_ULTIMATE.start_sll_remove_last_~snd_to_last~0#1.base_51| (store (select |v_#memory_int_83| |v_ULTIMATE.start_sll_remove_last_~snd_to_last~0#1.base_51|) .cse0 (select (select |c_#memory_int| |v_ULTIMATE.start_sll_remove_last_~snd_to_last~0#1.base_51|) .cse0)))) (= (store |v_#memory_$Pointer$.base_86| |v_ULTIMATE.start_sll_remove_last_~snd_to_last~0#1.base_51| (store (select |v_#memory_$Pointer$.base_86| |v_ULTIMATE.start_sll_remove_last_~snd_to_last~0#1.base_51|) .cse0 0)) |c_#memory_$Pointer$.base|) (= (store |v_#memory_$Pointer$.offset_86| |v_ULTIMATE.start_sll_remove_last_~snd_to_last~0#1.base_51| (store (select |v_#memory_$Pointer$.offset_86| |v_ULTIMATE.start_sll_remove_last_~snd_to_last~0#1.base_51|) .cse0 0)) |c_#memory_$Pointer$.offset|)))) (exists ((|v_#valid_65| (Array Int Int)) (|v_ULTIMATE.start_sll_remove_last_~last~0#1.base_60| Int)) (= |c_#valid| (store |v_#valid_65| |v_ULTIMATE.start_sll_remove_last_~last~0#1.base_60| 0))) (exists ((|v_ULTIMATE.start_main_~#s~0#1.offset_27| Int)) (and (= |c_ULTIMATE.start_main_#t~mem14#1.offset| (select (select |c_#memory_$Pointer$.offset| |c_ULTIMATE.start_main_~#s~0#1.base|) |v_ULTIMATE.start_main_~#s~0#1.offset_27|)) (= (select (select |c_#memory_$Pointer$.base| |c_ULTIMATE.start_main_~#s~0#1.base|) |v_ULTIMATE.start_main_~#s~0#1.offset_27|) |c_ULTIMATE.start_main_#t~mem14#1.base|)))) is different from true [2024-11-02 12:39:02,772 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '718#(and (or (exists ((|v_ULTIMATE.start_main_~#s~0#1.offset_27| Int)) (not (= (select (select |#memory_$Pointer$.base| |ULTIMATE.start_main_~#s~0#1.base|) |v_ULTIMATE.start_main_~#s~0#1.offset_27|) 0))) (exists ((|v_ULTIMATE.start_main_~#s~0#1.offset_27| Int)) (not (= (select (select |#memory_$Pointer$.offset| |ULTIMATE.start_main_~#s~0#1.base|) |v_ULTIMATE.start_main_~#s~0#1.offset_27|) 0)))) (exists ((|v_#memory_$Pointer$.base_86| (Array Int (Array Int Int))) (|v_#memory_$Pointer$.offset_86| (Array Int (Array Int Int))) (|v_ULTIMATE.start_sll_remove_last_~snd_to_last~0#1.base_51| Int) (|v_ULTIMATE.start_sll_remove_last_~snd_to_last~0#1.offset_53| Int) (|v_#memory_int_83| (Array Int (Array Int Int)))) (and (= (store |v_#memory_$Pointer$.base_86| |v_ULTIMATE.start_sll_remove_last_~snd_to_last~0#1.base_51| (store (select |v_#memory_$Pointer$.base_86| |v_ULTIMATE.start_sll_remove_last_~snd_to_last~0#1.base_51|) (+ |v_ULTIMATE.start_sll_remove_last_~snd_to_last~0#1.offset_53| 4) 0)) |#memory_$Pointer$.base|) (= |#memory_$Pointer$.offset| (store |v_#memory_$Pointer$.offset_86| |v_ULTIMATE.start_sll_remove_last_~snd_to_last~0#1.base_51| (store (select |v_#memory_$Pointer$.offset_86| |v_ULTIMATE.start_sll_remove_last_~snd_to_last~0#1.base_51|) (+ |v_ULTIMATE.start_sll_remove_last_~snd_to_last~0#1.offset_53| 4) 0))) (= |#memory_int| (store |v_#memory_int_83| |v_ULTIMATE.start_sll_remove_last_~snd_to_last~0#1.base_51| (store (select |v_#memory_int_83| |v_ULTIMATE.start_sll_remove_last_~snd_to_last~0#1.base_51|) (+ |v_ULTIMATE.start_sll_remove_last_~snd_to_last~0#1.offset_53| 4) (select (select |#memory_int| |v_ULTIMATE.start_sll_remove_last_~snd_to_last~0#1.base_51|) (+ |v_ULTIMATE.start_sll_remove_last_~snd_to_last~0#1.offset_53| 4))))))) (exists ((|v_#valid_65| (Array Int Int)) (|v_ULTIMATE.start_sll_remove_last_~last~0#1.base_60| Int)) (= (store |v_#valid_65| |v_ULTIMATE.start_sll_remove_last_~last~0#1.base_60| 0) |#valid|)))' at error location [2024-11-02 12:39:02,772 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-02 12:39:02,772 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-02 12:39:02,772 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 6 [2024-11-02 12:39:02,772 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1900084798] [2024-11-02 12:39:02,772 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-02 12:39:02,773 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2024-11-02 12:39:02,773 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-02 12:39:02,773 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2024-11-02 12:39:02,774 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=37, Invalid=115, Unknown=8, NotChecked=22, Total=182 [2024-11-02 12:39:02,774 INFO L87 Difference]: Start difference. First operand 22 states and 27 transitions. Second operand has 7 states, 7 states have (on average 3.5714285714285716) internal successors, (25), 6 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-02 12:39:02,814 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-02 12:39:02,814 INFO L93 Difference]: Finished difference Result 32 states and 38 transitions. [2024-11-02 12:39:02,814 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2024-11-02 12:39:02,815 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 3.5714285714285716) internal successors, (25), 6 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 17 [2024-11-02 12:39:02,815 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-02 12:39:02,816 INFO L225 Difference]: With dead ends: 32 [2024-11-02 12:39:02,816 INFO L226 Difference]: Without dead ends: 29 [2024-11-02 12:39:02,816 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 53 GetRequests, 39 SyntacticMatches, 2 SemanticMatches, 12 ConstructedPredicates, 1 IntricatePredicates, 0 DeprecatedPredicates, 34 ImplicationChecksByTransitivity, 2.5s TimeCoverageRelationStatistics Valid=37, Invalid=115, Unknown=8, NotChecked=22, Total=182 [2024-11-02 12:39:02,817 INFO L432 NwaCegarLoop]: 9 mSDtfsCounter, 9 mSDsluCounter, 20 mSDsCounter, 0 mSdLazyCounter, 19 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 9 SdHoareTripleChecker+Valid, 29 SdHoareTripleChecker+Invalid, 20 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 19 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2024-11-02 12:39:02,817 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [9 Valid, 29 Invalid, 20 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 19 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2024-11-02 12:39:02,821 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 29 states. [2024-11-02 12:39:02,825 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 29 to 27. [2024-11-02 12:39:02,826 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 27 states, 26 states have (on average 1.2692307692307692) internal successors, (33), 26 states have internal predecessors, (33), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-02 12:39:02,826 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 27 states to 27 states and 33 transitions. [2024-11-02 12:39:02,827 INFO L78 Accepts]: Start accepts. Automaton has 27 states and 33 transitions. Word has length 17 [2024-11-02 12:39:02,827 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-02 12:39:02,827 INFO L471 AbstractCegarLoop]: Abstraction has 27 states and 33 transitions. [2024-11-02 12:39:02,827 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 3.5714285714285716) internal successors, (25), 6 states have internal predecessors, (25), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-02 12:39:02,827 INFO L276 IsEmpty]: Start isEmpty. Operand 27 states and 33 transitions. [2024-11-02 12:39:02,827 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 19 [2024-11-02 12:39:02,828 INFO L207 NwaCegarLoop]: Found error trace [2024-11-02 12:39:02,828 INFO L215 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-02 12:39:02,845 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_44d5205a-1f1c-44ad-9d37-ea19cee96eca/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2024-11-02 12:39:03,028 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_44d5205a-1f1c-44ad-9d37-ea19cee96eca/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable5 [2024-11-02 12:39:03,029 INFO L396 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-02 12:39:03,029 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-02 12:39:03,029 INFO L85 PathProgramCache]: Analyzing trace with hash 157733475, now seen corresponding path program 1 times [2024-11-02 12:39:03,029 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-02 12:39:03,029 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2017194680] [2024-11-02 12:39:03,029 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-02 12:39:03,029 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-02 12:39:03,060 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-02 12:39:03,544 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2024-11-02 12:39:03,545 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-02 12:39:03,545 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2017194680] [2024-11-02 12:39:03,545 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2017194680] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-02 12:39:03,545 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1632829981] [2024-11-02 12:39:03,545 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-02 12:39:03,545 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-02 12:39:03,546 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_44d5205a-1f1c-44ad-9d37-ea19cee96eca/bin/utaipan-verify-DbMuA5NWw2/z3 [2024-11-02 12:39:03,547 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_44d5205a-1f1c-44ad-9d37-ea19cee96eca/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-02 12:39:03,548 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_44d5205a-1f1c-44ad-9d37-ea19cee96eca/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2024-11-02 12:39:03,684 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-02 12:39:03,686 INFO L255 TraceCheckSpWp]: Trace formula consists of 252 conjuncts, 32 conjuncts are in the unsatisfiable core [2024-11-02 12:39:03,688 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-02 12:39:03,731 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 [2024-11-02 12:39:03,744 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 [2024-11-02 12:39:03,846 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 11 [2024-11-02 12:39:03,861 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 11 [2024-11-02 12:39:03,882 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2024-11-02 12:39:03,882 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-02 12:39:03,952 WARN L851 $PredicateComparison]: unable to prove that (and (forall ((v_ArrVal_402 (Array Int Int))) (= (select (select (store |c_#memory_$Pointer$.offset| |c_ULTIMATE.start_sll_remove_last_~snd_to_last~0#1.base| v_ArrVal_402) |c_ULTIMATE.start_main_~#s~0#1.base|) |c_ULTIMATE.start_main_~#s~0#1.offset|) 0)) (forall ((v_ArrVal_403 (Array Int Int))) (= (select (select (store |c_#memory_$Pointer$.base| |c_ULTIMATE.start_sll_remove_last_~snd_to_last~0#1.base| v_ArrVal_403) |c_ULTIMATE.start_main_~#s~0#1.base|) |c_ULTIMATE.start_main_~#s~0#1.offset|) 0))) is different from false [2024-11-02 12:39:03,991 WARN L851 $PredicateComparison]: unable to prove that (and (forall ((v_ArrVal_402 (Array Int Int))) (= (select (select (store |c_#memory_$Pointer$.offset| 0 v_ArrVal_402) |c_ULTIMATE.start_main_~#s~0#1.base|) |c_ULTIMATE.start_main_~#s~0#1.offset|) 0)) (forall ((v_ArrVal_403 (Array Int Int))) (= (select (select (store |c_#memory_$Pointer$.base| 0 v_ArrVal_403) |c_ULTIMATE.start_main_~#s~0#1.base|) |c_ULTIMATE.start_main_~#s~0#1.offset|) 0))) is different from false [2024-11-02 12:39:04,023 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2024-11-02 12:39:04,023 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 [2024-11-02 12:39:04,038 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2024-11-02 12:39:04,038 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 30 treesize of output 33 [2024-11-02 12:39:04,043 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 [2024-11-02 12:39:04,064 INFO L349 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2024-11-02 12:39:04,064 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 1 [2024-11-02 12:39:04,078 INFO L134 CoverageAnalysis]: Checked inductivity of 9 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 4 trivial. 4 not checked. [2024-11-02 12:39:04,079 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1632829981] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-02 12:39:04,079 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1969814786] [2024-11-02 12:39:04,081 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2024-11-02 12:39:04,081 INFO L166 IcfgInterpreter]: Building call graph [2024-11-02 12:39:04,081 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-02 12:39:04,081 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-02 12:39:04,081 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-02 12:39:04,744 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-02 12:39:07,021 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSifa [1969814786] provided 1 perfect and 0 imperfect interpolant sequences [2024-11-02 12:39:07,021 INFO L185 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2024-11-02 12:39:07,021 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [7, 6, 7] total 19 [2024-11-02 12:39:07,021 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1489285942] [2024-11-02 12:39:07,021 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2024-11-02 12:39:07,022 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2024-11-02 12:39:07,022 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-02 12:39:07,023 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2024-11-02 12:39:07,023 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=68, Invalid=244, Unknown=2, NotChecked=66, Total=380 [2024-11-02 12:39:07,023 INFO L87 Difference]: Start difference. First operand 27 states and 33 transitions. Second operand has 10 states, 10 states have (on average 1.4) internal successors, (14), 9 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-02 12:39:09,218 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.00s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2024-11-02 12:39:11,455 WARN L539 Checker$ProtectedHtc]: IncrementalHoareTripleChecker took 2.06s for a HTC check with result UNKNOWN. Formula has sorts [Array, Bool, Int], hasArrays=true, hasNonlinArith=false, quantifiers [0] [2024-11-02 12:39:11,574 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-02 12:39:11,574 INFO L93 Difference]: Finished difference Result 41 states and 51 transitions. [2024-11-02 12:39:11,575 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2024-11-02 12:39:11,575 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 1.4) internal successors, (14), 9 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 18 [2024-11-02 12:39:11,575 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-02 12:39:11,576 INFO L225 Difference]: With dead ends: 41 [2024-11-02 12:39:11,576 INFO L226 Difference]: Without dead ends: 32 [2024-11-02 12:39:11,576 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 60 GetRequests, 42 SyntacticMatches, 0 SemanticMatches, 18 ConstructedPredicates, 2 IntricatePredicates, 0 DeprecatedPredicates, 58 ImplicationChecksByTransitivity, 2.4s TimeCoverageRelationStatistics Valid=68, Invalid=244, Unknown=2, NotChecked=66, Total=380 [2024-11-02 12:39:11,577 INFO L432 NwaCegarLoop]: 3 mSDtfsCounter, 4 mSDsluCounter, 19 mSDsCounter, 0 mSdLazyCounter, 96 mSolverCounterSat, 0 mSolverCounterUnsat, 2 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 4.5s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4 SdHoareTripleChecker+Valid, 22 SdHoareTripleChecker+Invalid, 98 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 96 IncrementalHoareTripleChecker+Invalid, 2 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 4.5s IncrementalHoareTripleChecker+Time [2024-11-02 12:39:11,577 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [4 Valid, 22 Invalid, 98 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 96 Invalid, 2 Unknown, 0 Unchecked, 4.5s Time] [2024-11-02 12:39:11,578 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 32 states. [2024-11-02 12:39:11,591 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 32 to 29. [2024-11-02 12:39:11,593 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 29 states, 28 states have (on average 1.25) internal successors, (35), 28 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-02 12:39:11,593 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 35 transitions. [2024-11-02 12:39:11,594 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 35 transitions. Word has length 18 [2024-11-02 12:39:11,594 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-02 12:39:11,594 INFO L471 AbstractCegarLoop]: Abstraction has 29 states and 35 transitions. [2024-11-02 12:39:11,595 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 1.4) internal successors, (14), 9 states have internal predecessors, (14), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-02 12:39:11,595 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 35 transitions. [2024-11-02 12:39:11,595 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2024-11-02 12:39:11,596 INFO L207 NwaCegarLoop]: Found error trace [2024-11-02 12:39:11,596 INFO L215 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2024-11-02 12:39:11,617 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_44d5205a-1f1c-44ad-9d37-ea19cee96eca/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2024-11-02 12:39:11,796 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_44d5205a-1f1c-44ad-9d37-ea19cee96eca/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable6 [2024-11-02 12:39:11,797 INFO L396 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-02 12:39:11,797 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-02 12:39:11,797 INFO L85 PathProgramCache]: Analyzing trace with hash 78171966, now seen corresponding path program 1 times [2024-11-02 12:39:11,797 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-02 12:39:11,797 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [11124758] [2024-11-02 12:39:11,798 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-02 12:39:11,798 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-02 12:39:11,828 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-02 12:39:12,622 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 1 proven. 6 refuted. 0 times theorem prover too weak. 4 trivial. 0 not checked. [2024-11-02 12:39:12,622 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2024-11-02 12:39:12,622 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [11124758] [2024-11-02 12:39:12,622 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [11124758] provided 0 perfect and 1 imperfect interpolant sequences [2024-11-02 12:39:12,622 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1659505025] [2024-11-02 12:39:12,623 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-02 12:39:12,623 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2024-11-02 12:39:12,623 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_44d5205a-1f1c-44ad-9d37-ea19cee96eca/bin/utaipan-verify-DbMuA5NWw2/z3 [2024-11-02 12:39:12,625 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_44d5205a-1f1c-44ad-9d37-ea19cee96eca/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2024-11-02 12:39:12,628 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_44d5205a-1f1c-44ad-9d37-ea19cee96eca/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2024-11-02 12:39:12,814 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2024-11-02 12:39:12,821 INFO L255 TraceCheckSpWp]: Trace formula consists of 265 conjuncts, 36 conjuncts are in the unsatisfiable core [2024-11-02 12:39:12,824 INFO L278 TraceCheckSpWp]: Computing forward predicates... [2024-11-02 12:39:12,891 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 [2024-11-02 12:39:12,910 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 [2024-11-02 12:39:13,305 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 11 [2024-11-02 12:39:13,327 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 11 [2024-11-02 12:39:13,381 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 6 trivial. 0 not checked. [2024-11-02 12:39:13,381 INFO L311 TraceCheckSpWp]: Computing backward predicates... [2024-11-02 12:39:13,632 WARN L851 $PredicateComparison]: unable to prove that (and (forall ((v_ArrVal_512 (Array Int Int))) (= (select (select (store |c_#memory_$Pointer$.base| |c_ULTIMATE.start_sll_remove_last_~last~0#1.base| v_ArrVal_512) |c_ULTIMATE.start_main_~#s~0#1.base|) |c_ULTIMATE.start_main_~#s~0#1.offset|) 0)) (forall ((v_ArrVal_511 (Array Int Int))) (= (select (select (store |c_#memory_$Pointer$.offset| |c_ULTIMATE.start_sll_remove_last_~last~0#1.base| v_ArrVal_511) |c_ULTIMATE.start_main_~#s~0#1.base|) |c_ULTIMATE.start_main_~#s~0#1.offset|) 0))) is different from false [2024-11-02 12:39:13,686 WARN L851 $PredicateComparison]: unable to prove that (let ((.cse0 (select (select |c_#memory_$Pointer$.base| |c_ULTIMATE.start_sll_remove_last_~head#1.base|) |c_ULTIMATE.start_sll_remove_last_~head#1.offset|))) (and (forall ((v_ArrVal_512 (Array Int Int))) (= (select (select (store |c_#memory_$Pointer$.base| .cse0 v_ArrVal_512) |c_ULTIMATE.start_main_~#s~0#1.base|) |c_ULTIMATE.start_main_~#s~0#1.offset|) 0)) (forall ((v_ArrVal_511 (Array Int Int))) (= (select (select (store |c_#memory_$Pointer$.offset| .cse0 v_ArrVal_511) |c_ULTIMATE.start_main_~#s~0#1.base|) |c_ULTIMATE.start_main_~#s~0#1.offset|) 0)))) is different from false [2024-11-02 12:39:13,986 INFO L349 Elim1Store]: treesize reduction 15, result has 64.3 percent of original size [2024-11-02 12:39:13,987 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 2 case distinctions, treesize of input 58 treesize of output 64 [2024-11-02 12:39:14,028 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2024-11-02 12:39:14,029 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 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 88 treesize of output 83 [2024-11-02 12:39:14,040 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 54 treesize of output 50 [2024-11-02 12:39:14,145 INFO L190 IndexEqualityManager]: detected not equals via solver [2024-11-02 12:39:14,149 INFO L190 IndexEqualityManager]: detected not equals via solver [2024-11-02 12:39:14,162 INFO L349 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2024-11-02 12:39:14,163 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 1 [2024-11-02 12:39:14,207 INFO L134 CoverageAnalysis]: Checked inductivity of 11 backedges. 0 proven. 3 refuted. 1 times theorem prover too weak. 4 trivial. 3 not checked. [2024-11-02 12:39:14,207 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1659505025] provided 0 perfect and 2 imperfect interpolant sequences [2024-11-02 12:39:14,208 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [872438624] [2024-11-02 12:39:14,210 INFO L159 IcfgInterpreter]: Started Sifa with 12 locations of interest [2024-11-02 12:39:14,212 INFO L166 IcfgInterpreter]: Building call graph [2024-11-02 12:39:14,212 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2024-11-02 12:39:14,213 INFO L176 IcfgInterpreter]: Starting interpretation [2024-11-02 12:39:14,213 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2024-11-02 12:39:14,715 INFO L180 IcfgInterpreter]: Interpretation finished [2024-11-02 12:39:15,970 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1153#(and (<= 1 |#StackHeapBarrier|) (or (not (= (select (select |#memory_$Pointer$.offset| |ULTIMATE.start_main_~#s~0#1.base|) 0) 0)) (not (= (select (select |#memory_$Pointer$.base| |ULTIMATE.start_main_~#s~0#1.base|) 0) 0))) (<= 2 |ULTIMATE.start_main_~#s~0#1.base|))' at error location [2024-11-02 12:39:15,970 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2024-11-02 12:39:15,970 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2024-11-02 12:39:15,970 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8, 9] total 16 [2024-11-02 12:39:15,971 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [673391066] [2024-11-02 12:39:15,971 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2024-11-02 12:39:15,971 INFO L548 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2024-11-02 12:39:15,971 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2024-11-02 12:39:15,972 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2024-11-02 12:39:15,972 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=90, Invalid=398, Unknown=26, NotChecked=86, Total=600 [2024-11-02 12:39:15,973 INFO L87 Difference]: Start difference. First operand 29 states and 35 transitions. Second operand has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 16 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-02 12:39:16,569 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2024-11-02 12:39:16,569 INFO L93 Difference]: Finished difference Result 44 states and 54 transitions. [2024-11-02 12:39:16,570 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2024-11-02 12:39:16,570 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 16 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2024-11-02 12:39:16,570 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2024-11-02 12:39:16,571 INFO L225 Difference]: With dead ends: 44 [2024-11-02 12:39:16,571 INFO L226 Difference]: Without dead ends: 24 [2024-11-02 12:39:16,571 INFO L431 NwaCegarLoop]: 0 DeclaredPredicates, 71 GetRequests, 45 SyntacticMatches, 1 SemanticMatches, 25 ConstructedPredicates, 2 IntricatePredicates, 0 DeprecatedPredicates, 127 ImplicationChecksByTransitivity, 2.2s TimeCoverageRelationStatistics Valid=105, Invalid=475, Unknown=28, NotChecked=94, Total=702 [2024-11-02 12:39:16,572 INFO L432 NwaCegarLoop]: 9 mSDtfsCounter, 15 mSDsluCounter, 47 mSDsCounter, 0 mSdLazyCounter, 141 mSolverCounterSat, 3 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 15 SdHoareTripleChecker+Valid, 56 SdHoareTripleChecker+Invalid, 205 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 3 IncrementalHoareTripleChecker+Valid, 141 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 61 IncrementalHoareTripleChecker+Unchecked, 0.4s IncrementalHoareTripleChecker+Time [2024-11-02 12:39:16,572 INFO L433 NwaCegarLoop]: SdHoareTripleChecker [15 Valid, 56 Invalid, 205 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [3 Valid, 141 Invalid, 0 Unknown, 61 Unchecked, 0.4s Time] [2024-11-02 12:39:16,573 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2024-11-02 12:39:16,578 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2024-11-02 12:39:16,578 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 23 states have (on average 1.173913043478261) internal successors, (27), 23 states have internal predecessors, (27), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-02 12:39:16,579 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 27 transitions. [2024-11-02 12:39:16,579 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 27 transitions. Word has length 20 [2024-11-02 12:39:16,579 INFO L84 Accepts]: Finished accepts. word is rejected. [2024-11-02 12:39:16,580 INFO L471 AbstractCegarLoop]: Abstraction has 24 states and 27 transitions. [2024-11-02 12:39:16,580 INFO L472 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 17 states have (on average 2.0588235294117645) internal successors, (35), 16 states have internal predecessors, (35), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2024-11-02 12:39:16,580 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 27 transitions. [2024-11-02 12:39:16,580 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 24 [2024-11-02 12:39:16,580 INFO L207 NwaCegarLoop]: Found error trace [2024-11-02 12:39:16,581 INFO L215 NwaCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1] [2024-11-02 12:39:16,597 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_44d5205a-1f1c-44ad-9d37-ea19cee96eca/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2024-11-02 12:39:16,781 WARN L453 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: 8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_44d5205a-1f1c-44ad-9d37-ea19cee96eca/bin/utaipan-verify-DbMuA5NWw2/z3 -smt2 -in SMTLIB2_COMPLIANT=true,SelfDestructingSolverStorable7 [2024-11-02 12:39:16,782 INFO L396 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2024-11-02 12:39:16,782 INFO L157 PredicateUnifier]: Initialized classic predicate unifier [2024-11-02 12:39:16,782 INFO L85 PathProgramCache]: Analyzing trace with hash 477978772, now seen corresponding path program 3 times [2024-11-02 12:39:16,782 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2024-11-02 12:39:16,782 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1605418437] [2024-11-02 12:39:16,782 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2024-11-02 12:39:16,782 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2024-11-02 12:39:16,827 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat