./Ultimate.py --spec ../../sv-benchmarks/c/properties/unreach-call.prp --file ../../sv-benchmarks/c/list-simple/dll2n_remove_all_reverse.i --full-output --architecture 32bit -------------------------------------------------------------------------------- Checking for ERROR reachability Using default analysis Version 30e01a73 Calling Ultimate with: /usr/lib/jvm/java-1.11.0-openjdk-amd64/bin/java -Dosgi.configuration.area=/tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e36a390d-86b4-403d-9b3f-7370520df2e8/bin/utaipan-verify-mE87zJ7Ire/data/config -Xmx15G -Xms4m -jar /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e36a390d-86b4-403d-9b3f-7370520df2e8/bin/utaipan-verify-mE87zJ7Ire/plugins/org.eclipse.equinox.launcher_1.5.800.v20200727-1323.jar -data @noDefault -ultimatedata /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e36a390d-86b4-403d-9b3f-7370520df2e8/bin/utaipan-verify-mE87zJ7Ire/data -tc /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e36a390d-86b4-403d-9b3f-7370520df2e8/bin/utaipan-verify-mE87zJ7Ire/config/TaipanReach.xml -i ../../sv-benchmarks/c/list-simple/dll2n_remove_all_reverse.i -s /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e36a390d-86b4-403d-9b3f-7370520df2e8/bin/utaipan-verify-mE87zJ7Ire/config/svcomp-Reach-32bit-Taipan_Default.epf --cacsl2boogietranslator.entry.function main --witnessprinter.witness.directory /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e36a390d-86b4-403d-9b3f-7370520df2e8/bin/utaipan-verify-mE87zJ7Ire --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 4d5c55d9a4a2ded389ff7ce077afdc88fb2d2855921e5fd1e3b93fbba7e140e8 --- Real Ultimate output --- This is Ultimate 0.2.3-dev-30e01a7 [2023-11-23 21:09:40,342 INFO L188 SettingsManager]: Resetting all preferences to default values... [2023-11-23 21:09:40,459 INFO L114 SettingsManager]: Loading settings from /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e36a390d-86b4-403d-9b3f-7370520df2e8/bin/utaipan-verify-mE87zJ7Ire/config/svcomp-Reach-32bit-Taipan_Default.epf [2023-11-23 21:09:40,464 WARN L101 SettingsManager]: Preference file contains the following unknown settings: [2023-11-23 21:09:40,465 WARN L103 SettingsManager]: * de.uni_freiburg.informatik.ultimate.core.Log level for class [2023-11-23 21:09:40,487 INFO L130 SettingsManager]: Preferences different from defaults after loading the file: [2023-11-23 21:09:40,488 INFO L151 SettingsManager]: Preferences of UltimateCore differ from their defaults: [2023-11-23 21:09:40,489 INFO L153 SettingsManager]: * Log level for class=de.uni_freiburg.informatik.ultimate.lib.smtlibutils.quantifier.QuantifierPusher=ERROR; [2023-11-23 21:09:40,490 INFO L151 SettingsManager]: Preferences of Boogie Procedure Inliner differ from their defaults: [2023-11-23 21:09:40,490 INFO L153 SettingsManager]: * Ignore calls to procedures called more than once=ONLY_FOR_SEQUENTIAL_PROGRAMS [2023-11-23 21:09:40,491 INFO L153 SettingsManager]: * User list type=DISABLED [2023-11-23 21:09:40,492 INFO L151 SettingsManager]: Preferences of Abstract Interpretation differ from their defaults: [2023-11-23 21:09:40,492 INFO L153 SettingsManager]: * Explicit value domain=true [2023-11-23 21:09:40,493 INFO L153 SettingsManager]: * Abstract domain for RCFG-of-the-future=PoormanAbstractDomain [2023-11-23 21:09:40,494 INFO L153 SettingsManager]: * Octagon Domain=false [2023-11-23 21:09:40,494 INFO L153 SettingsManager]: * Abstract domain=CompoundDomain [2023-11-23 21:09:40,495 INFO L153 SettingsManager]: * Check feasibility of abstract posts with an SMT solver=true [2023-11-23 21:09:40,495 INFO L153 SettingsManager]: * Use the RCFG-of-the-future interface=true [2023-11-23 21:09:40,496 INFO L153 SettingsManager]: * Interval Domain=false [2023-11-23 21:09:40,496 INFO L151 SettingsManager]: Preferences of Sifa differ from their defaults: [2023-11-23 21:09:40,497 INFO L153 SettingsManager]: * Call Summarizer=TopInputCallSummarizer [2023-11-23 21:09:40,498 INFO L153 SettingsManager]: * Simplification Technique=POLY_PAC [2023-11-23 21:09:40,498 INFO L151 SettingsManager]: Preferences of CACSL2BoogieTranslator differ from their defaults: [2023-11-23 21:09:40,499 INFO L153 SettingsManager]: * Pointer base address is valid at dereference=IGNORE [2023-11-23 21:09:40,499 INFO L153 SettingsManager]: * sizeof long=4 [2023-11-23 21:09:40,500 INFO L153 SettingsManager]: * Overapproximate operations on floating types=true [2023-11-23 21:09:40,500 INFO L153 SettingsManager]: * sizeof POINTER=4 [2023-11-23 21:09:40,501 INFO L153 SettingsManager]: * Check division by zero=IGNORE [2023-11-23 21:09:40,501 INFO L153 SettingsManager]: * Pointer to allocated memory at dereference=IGNORE [2023-11-23 21:09:40,502 INFO L153 SettingsManager]: * If two pointers are subtracted or compared they have the same base address=IGNORE [2023-11-23 21:09:40,502 INFO L153 SettingsManager]: * Check array bounds for arrays that are off heap=IGNORE [2023-11-23 21:09:40,502 INFO L153 SettingsManager]: * sizeof long double=12 [2023-11-23 21:09:40,503 INFO L153 SettingsManager]: * Check if freed pointer was valid=false [2023-11-23 21:09:40,503 INFO L153 SettingsManager]: * Use constant arrays=true [2023-11-23 21:09:40,503 INFO L151 SettingsManager]: Preferences of RCFGBuilder differ from their defaults: [2023-11-23 21:09:40,504 INFO L153 SettingsManager]: * Only consider context switches at boundaries of atomic blocks=true [2023-11-23 21:09:40,504 INFO L153 SettingsManager]: * SMT solver=External_DefaultMode [2023-11-23 21:09:40,504 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-23 21:09:40,504 INFO L151 SettingsManager]: Preferences of TraceAbstraction differ from their defaults: [2023-11-23 21:09:40,505 INFO L153 SettingsManager]: * Compute Interpolants along a Counterexample=FPandBP [2023-11-23 21:09:40,505 INFO L153 SettingsManager]: * Positions where we compute the Hoare Annotation=LoopHeads [2023-11-23 21:09:40,505 INFO L153 SettingsManager]: * Trace refinement strategy=SIFA_TAIPAN [2023-11-23 21:09:40,506 INFO L153 SettingsManager]: * Command for external solver=z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in [2023-11-23 21:09:40,506 INFO L153 SettingsManager]: * Apply one-shot large block encoding in concurrent analysis=false [2023-11-23 21:09:40,506 INFO L153 SettingsManager]: * Compute Hoare Annotation of negated interpolant automaton, abstraction and CFG=true [2023-11-23 21:09:40,506 INFO L153 SettingsManager]: * Trace refinement exception blacklist=NONE [2023-11-23 21:09:40,507 INFO L153 SettingsManager]: * SMT solver=External_ModelsAndUnsatCoreMode [2023-11-23 21:09:40,507 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_e36a390d-86b4-403d-9b3f-7370520df2e8/bin/utaipan-verify-mE87zJ7Ire/plugins/com.sun.xml.bind_2.2.0.v201505121915.jar) to method java.lang.ClassLoader.defineClass(java.lang.String,byte[],int,int) WARNING: Please consider reporting this to the maintainers of com.sun.xml.bind.v2.runtime.reflect.opt.Injector$1 WARNING: Use --illegal-access=warn to enable warnings of further illegal reflective access operations WARNING: All illegal access operations will be denied in a future release Applying setting for plugin de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator: Entry function -> main Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness directory -> /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e36a390d-86b4-403d-9b3f-7370520df2e8/bin/utaipan-verify-mE87zJ7Ire Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Witness filename -> witness Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Write witness besides input file -> false Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data specification -> CHECK( init(main()), LTL(G ! call(reach_error())) ) Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data producer -> Taipan Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data architecture -> 32bit Applying setting for plugin de.uni_freiburg.informatik.ultimate.witnessprinter: Graph data programhash -> 4d5c55d9a4a2ded389ff7ce077afdc88fb2d2855921e5fd1e3b93fbba7e140e8 [2023-11-23 21:09:40,783 INFO L75 nceAwareModelManager]: Repository-Root is: /tmp [2023-11-23 21:09:40,819 INFO L261 ainManager$Toolchain]: [Toolchain 1]: Applicable parser(s) successfully (re)initialized [2023-11-23 21:09:40,822 INFO L217 ainManager$Toolchain]: [Toolchain 1]: Toolchain selected. [2023-11-23 21:09:40,824 INFO L270 PluginConnector]: Initializing CDTParser... [2023-11-23 21:09:40,825 INFO L274 PluginConnector]: CDTParser initialized [2023-11-23 21:09:40,826 INFO L431 ainManager$Toolchain]: [Toolchain 1]: Parsing single file: /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e36a390d-86b4-403d-9b3f-7370520df2e8/bin/utaipan-verify-mE87zJ7Ire/../../sv-benchmarks/c/list-simple/dll2n_remove_all_reverse.i [2023-11-23 21:09:44,056 INFO L533 CDTParser]: Created temporary CDT project at NULL [2023-11-23 21:09:44,441 INFO L384 CDTParser]: Found 1 translation units. [2023-11-23 21:09:44,441 INFO L180 CDTParser]: Scanning /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e36a390d-86b4-403d-9b3f-7370520df2e8/sv-benchmarks/c/list-simple/dll2n_remove_all_reverse.i [2023-11-23 21:09:44,459 INFO L427 CDTParser]: About to delete temporary CDT project at /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e36a390d-86b4-403d-9b3f-7370520df2e8/bin/utaipan-verify-mE87zJ7Ire/data/2c2212e0f/606311a97c5846e4a1612fc9a9878734/FLAGfe2e1d0c0 [2023-11-23 21:09:44,474 INFO L435 CDTParser]: Successfully deleted /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e36a390d-86b4-403d-9b3f-7370520df2e8/bin/utaipan-verify-mE87zJ7Ire/data/2c2212e0f/606311a97c5846e4a1612fc9a9878734 [2023-11-23 21:09:44,477 INFO L299 ainManager$Toolchain]: ####################### [Toolchain 1] ####################### [2023-11-23 21:09:44,478 INFO L133 ToolchainWalker]: Walking toolchain with 6 elements. [2023-11-23 21:09:44,480 INFO L112 PluginConnector]: ------------------------CACSL2BoogieTranslator---------------------------- [2023-11-23 21:09:44,480 INFO L270 PluginConnector]: Initializing CACSL2BoogieTranslator... [2023-11-23 21:09:44,493 INFO L274 PluginConnector]: CACSL2BoogieTranslator initialized [2023-11-23 21:09:44,494 INFO L184 PluginConnector]: Executing the observer ACSLObjectContainerObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 09:09:44" (1/1) ... [2023-11-23 21:09:44,496 INFO L204 PluginConnector]: Invalid model from CACSL2BoogieTranslator for observer de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator.ACSLObjectContainerObserver@15296d87 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:09:44, skipping insertion in model container [2023-11-23 21:09:44,496 INFO L184 PluginConnector]: Executing the observer CACSL2BoogieTranslatorObserver from plugin CACSL2BoogieTranslator for "CDTParser AST 23.11 09:09:44" (1/1) ... [2023-11-23 21:09:44,545 INFO L177 MainTranslator]: Built tables and reachable declarations [2023-11-23 21:09:44,918 WARN L240 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_e36a390d-86b4-403d-9b3f-7370520df2e8/sv-benchmarks/c/list-simple/dll2n_remove_all_reverse.i[24275,24288] [2023-11-23 21:09:44,923 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-23 21:09:44,942 INFO L202 MainTranslator]: Completed pre-run [2023-11-23 21:09:44,993 WARN L240 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_e36a390d-86b4-403d-9b3f-7370520df2e8/sv-benchmarks/c/list-simple/dll2n_remove_all_reverse.i[24275,24288] [2023-11-23 21:09:44,994 INFO L209 PostProcessor]: Analyzing one entry point: main [2023-11-23 21:09:45,043 INFO L206 MainTranslator]: Completed translation [2023-11-23 21:09:45,044 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:09:45 WrapperNode [2023-11-23 21:09:45,044 INFO L131 PluginConnector]: ------------------------ END CACSL2BoogieTranslator---------------------------- [2023-11-23 21:09:45,046 INFO L112 PluginConnector]: ------------------------Boogie Procedure Inliner---------------------------- [2023-11-23 21:09:45,046 INFO L270 PluginConnector]: Initializing Boogie Procedure Inliner... [2023-11-23 21:09:45,046 INFO L274 PluginConnector]: Boogie Procedure Inliner initialized [2023-11-23 21:09:45,054 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:09:45" (1/1) ... [2023-11-23 21:09:45,071 INFO L184 PluginConnector]: Executing the observer Inliner from plugin Boogie Procedure Inliner for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:09:45" (1/1) ... [2023-11-23 21:09:45,097 INFO L138 Inliner]: procedures = 126, calls = 35, calls flagged for inlining = 4, calls inlined = 4, statements flattened = 96 [2023-11-23 21:09:45,097 INFO L131 PluginConnector]: ------------------------ END Boogie Procedure Inliner---------------------------- [2023-11-23 21:09:45,098 INFO L112 PluginConnector]: ------------------------Boogie Preprocessor---------------------------- [2023-11-23 21:09:45,098 INFO L270 PluginConnector]: Initializing Boogie Preprocessor... [2023-11-23 21:09:45,099 INFO L274 PluginConnector]: Boogie Preprocessor initialized [2023-11-23 21:09:45,109 INFO L184 PluginConnector]: Executing the observer EnsureBoogieModelObserver from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:09:45" (1/1) ... [2023-11-23 21:09:45,110 INFO L184 PluginConnector]: Executing the observer TypeChecker from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:09:45" (1/1) ... [2023-11-23 21:09:45,113 INFO L184 PluginConnector]: Executing the observer ConstExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:09:45" (1/1) ... [2023-11-23 21:09:45,114 INFO L184 PluginConnector]: Executing the observer StructExpander from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:09:45" (1/1) ... [2023-11-23 21:09:45,123 INFO L184 PluginConnector]: Executing the observer UnstructureCode from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:09:45" (1/1) ... [2023-11-23 21:09:45,127 INFO L184 PluginConnector]: Executing the observer FunctionInliner from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:09:45" (1/1) ... [2023-11-23 21:09:45,129 INFO L184 PluginConnector]: Executing the observer LTLStepAnnotator from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:09:45" (1/1) ... [2023-11-23 21:09:45,131 INFO L184 PluginConnector]: Executing the observer BoogieSymbolTableConstructor from plugin Boogie Preprocessor for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:09:45" (1/1) ... [2023-11-23 21:09:45,135 INFO L131 PluginConnector]: ------------------------ END Boogie Preprocessor---------------------------- [2023-11-23 21:09:45,136 INFO L112 PluginConnector]: ------------------------RCFGBuilder---------------------------- [2023-11-23 21:09:45,136 INFO L270 PluginConnector]: Initializing RCFGBuilder... [2023-11-23 21:09:45,136 INFO L274 PluginConnector]: RCFGBuilder initialized [2023-11-23 21:09:45,137 INFO L184 PluginConnector]: Executing the observer RCFGBuilderObserver from plugin RCFGBuilder for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:09:45" (1/1) ... [2023-11-23 21:09:45,144 INFO L173 SolverBuilder]: Constructing external solver with command: z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 [2023-11-23 21:09:45,160 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e36a390d-86b4-403d-9b3f-7370520df2e8/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:09:45,174 INFO L229 MonitoredProcess]: Starting monitored process 1 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e36a390d-86b4-403d-9b3f-7370520df2e8/bin/utaipan-verify-mE87zJ7Ire/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (exit command is (exit), workingDir is null) [2023-11-23 21:09:45,191 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e36a390d-86b4-403d-9b3f-7370520df2e8/bin/utaipan-verify-mE87zJ7Ire/z3 SMTLIB2_COMPLIANT=true -memory:2024 -smt2 -in -t:2000 (1)] Waiting until timeout for monitored process [2023-11-23 21:09:45,222 INFO L130 BoogieDeclarations]: Found specification of procedure myexit [2023-11-23 21:09:45,222 INFO L138 BoogieDeclarations]: Found implementation of procedure myexit [2023-11-23 21:09:45,222 INFO L130 BoogieDeclarations]: Found specification of procedure write~int [2023-11-23 21:09:45,222 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnHeap [2023-11-23 21:09:45,225 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocInit [2023-11-23 21:09:45,225 INFO L130 BoogieDeclarations]: Found specification of procedure #Ultimate.allocOnStack [2023-11-23 21:09:45,226 INFO L130 BoogieDeclarations]: Found specification of procedure write~$Pointer$ [2023-11-23 21:09:45,226 INFO L130 BoogieDeclarations]: Found specification of procedure read~$Pointer$ [2023-11-23 21:09:45,226 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.dealloc [2023-11-23 21:09:45,226 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~$Pointer$ [2023-11-23 21:09:45,227 INFO L130 BoogieDeclarations]: Found specification of procedure write~init~int [2023-11-23 21:09:45,227 INFO L130 BoogieDeclarations]: Found specification of procedure ULTIMATE.start [2023-11-23 21:09:45,227 INFO L138 BoogieDeclarations]: Found implementation of procedure ULTIMATE.start [2023-11-23 21:09:45,398 INFO L241 CfgBuilder]: Building ICFG [2023-11-23 21:09:45,401 INFO L267 CfgBuilder]: Building CFG for each procedure with an implementation [2023-11-23 21:09:45,445 INFO L775 $ProcedureCfgBuilder]: dead code at ProgramPoint myexitFINAL: assume true; [2023-11-23 21:09:45,637 INFO L282 CfgBuilder]: Performing block encoding [2023-11-23 21:09:45,688 INFO L304 CfgBuilder]: Using the 1 location(s) as analysis (start of procedure ULTIMATE.start) [2023-11-23 21:09:45,689 INFO L309 CfgBuilder]: Removed 3 assume(true) statements. [2023-11-23 21:09:45,690 INFO L201 PluginConnector]: Adding new model de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 09:09:45 BoogieIcfgContainer [2023-11-23 21:09:45,691 INFO L131 PluginConnector]: ------------------------ END RCFGBuilder---------------------------- [2023-11-23 21:09:45,693 INFO L112 PluginConnector]: ------------------------TraceAbstraction---------------------------- [2023-11-23 21:09:45,693 INFO L270 PluginConnector]: Initializing TraceAbstraction... [2023-11-23 21:09:45,697 INFO L274 PluginConnector]: TraceAbstraction initialized [2023-11-23 21:09:45,697 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "CDTParser AST 23.11 09:09:44" (1/3) ... [2023-11-23 21:09:45,698 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@31dd2a89 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 09:09:45, skipping insertion in model container [2023-11-23 21:09:45,698 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.cacsl2boogietranslator AST 23.11 09:09:45" (2/3) ... [2023-11-23 21:09:45,699 INFO L204 PluginConnector]: Invalid model from TraceAbstraction for observer de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction.TraceAbstractionObserver@31dd2a89 and model type de.uni_freiburg.informatik.ultimate.plugins.generator.traceabstraction AST 23.11 09:09:45, skipping insertion in model container [2023-11-23 21:09:45,699 INFO L184 PluginConnector]: Executing the observer TraceAbstractionObserver from plugin TraceAbstraction for "de.uni_freiburg.informatik.ultimate.plugins.generator.rcfgbuilder CFG 23.11 09:09:45" (3/3) ... [2023-11-23 21:09:45,701 INFO L112 eAbstractionObserver]: Analyzing ICFG dll2n_remove_all_reverse.i [2023-11-23 21:09:45,721 INFO L203 ceAbstractionStarter]: Automizer settings: Hoare:true NWA Interpolation:FPandBP Determinization: PREDICATE_ABSTRACTION [2023-11-23 21:09:45,722 INFO L162 ceAbstractionStarter]: Applying trace abstraction to program that has 1 error locations. [2023-11-23 21:09:45,773 INFO L356 AbstractCegarLoop]: ======== Iteration 0 == of CEGAR loop == AllErrorsAtOnce ======== [2023-11-23 21:09:45,780 INFO L357 AbstractCegarLoop]: Settings: SEPARATE_VIOLATION_CHECK=true, mInterprocedural=true, mMaxIterations=1000000, mWatchIteration=1000000, mArtifact=RCFG, mInterpolation=FPandBP, mInterpolantAutomaton=STRAIGHT_LINE, mDumpAutomata=false, mAutomataFormat=ATS_NUMERATE, mDumpPath=., mDeterminiation=PREDICATE_ABSTRACTION, mMinimize=MINIMIZE_SEVPA, mHoare=true, 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;@2d31ec30, mLbeIndependenceSettings=[IndependenceType=SEMANTIC, AbstractionType=NONE, UseConditional=false, UseSemiCommutativity=true, Solver=Z3, SolverTimeout=1000ms] [2023-11-23 21:09:45,781 INFO L358 AbstractCegarLoop]: Starting to check reachability of 1 error locations. [2023-11-23 21:09:45,785 INFO L276 IsEmpty]: Start isEmpty. Operand has 18 states, 15 states have (on average 1.5333333333333334) internal successors, (23), 16 states have internal predecessors, (23), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:09:45,793 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 6 [2023-11-23 21:09:45,793 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:09:45,794 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1] [2023-11-23 21:09:45,795 INFO L420 AbstractCegarLoop]: === Iteration 1 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:09:45,801 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:09:45,801 INFO L85 PathProgramCache]: Analyzing trace with hash 110912375, now seen corresponding path program 1 times [2023-11-23 21:09:45,813 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:09:45,813 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2027794440] [2023-11-23 21:09:45,814 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:09:45,814 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:09:45,957 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:09:46,157 INFO L134 CoverageAnalysis]: Checked inductivity of 0 backedges. 0 proven. 0 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 21:09:46,157 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:09:46,158 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2027794440] [2023-11-23 21:09:46,159 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2027794440] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 21:09:46,159 INFO L185 FreeRefinementEngine]: Found 1 perfect and 0 imperfect interpolant sequences. [2023-11-23 21:09:46,159 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [2] imperfect sequences [] total 2 [2023-11-23 21:09:46,161 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1276056743] [2023-11-23 21:09:46,162 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:09:46,169 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 3 states [2023-11-23 21:09:46,171 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:09:46,215 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 3 interpolants. [2023-11-23 21:09:46,216 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-23 21:09:46,218 INFO L87 Difference]: Start difference. First operand has 18 states, 15 states have (on average 1.5333333333333334) internal successors, (23), 16 states have internal predecessors, (23), 1 states have call successors, (1), 1 states have call predecessors, (1), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) 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) [2023-11-23 21:09:46,310 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:09:46,311 INFO L93 Difference]: Finished difference Result 33 states and 45 transitions. [2023-11-23 21:09:46,313 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 3 states. [2023-11-23 21:09:46,314 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 [2023-11-23 21:09:46,314 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:09:46,320 INFO L225 Difference]: With dead ends: 33 [2023-11-23 21:09:46,320 INFO L226 Difference]: Without dead ends: 16 [2023-11-23 21:09:46,322 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 2 GetRequests, 1 SyntacticMatches, 0 SemanticMatches, 1 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 0 ImplicationChecksByTransitivity, 0.0s TimeCoverageRelationStatistics Valid=3, Invalid=3, Unknown=0, NotChecked=0, Total=6 [2023-11-23 21:09:46,326 INFO L413 NwaCegarLoop]: 15 mSDtfsCounter, 3 mSDsluCounter, 15 mSDsCounter, 0 mSdLazyCounter, 13 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 3 SdHoareTripleChecker+Valid, 30 SdHoareTripleChecker+Invalid, 13 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 13 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-23 21:09:46,327 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [3 Valid, 30 Invalid, 13 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 13 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-23 21:09:46,347 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 16 states. [2023-11-23 21:09:46,384 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 16 to 14. [2023-11-23 21:09:46,385 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) [2023-11-23 21:09:46,386 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 14 states to 14 states and 17 transitions. [2023-11-23 21:09:46,387 INFO L78 Accepts]: Start accepts. Automaton has 14 states and 17 transitions. Word has length 5 [2023-11-23 21:09:46,387 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:09:46,388 INFO L495 AbstractCegarLoop]: Abstraction has 14 states and 17 transitions. [2023-11-23 21:09:46,388 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 3 states, 3 states have (on average 1.6666666666666667) internal successors, (5), 2 states have internal predecessors, (5), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:09:46,388 INFO L276 IsEmpty]: Start isEmpty. Operand 14 states and 17 transitions. [2023-11-23 21:09:46,388 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 9 [2023-11-23 21:09:46,389 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:09:46,389 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:09:46,389 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable0 [2023-11-23 21:09:46,389 INFO L420 AbstractCegarLoop]: === Iteration 2 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:09:46,390 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:09:46,390 INFO L85 PathProgramCache]: Analyzing trace with hash -213104249, now seen corresponding path program 1 times [2023-11-23 21:09:46,391 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:09:46,391 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [2026468324] [2023-11-23 21:09:46,391 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:09:46,391 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:09:46,494 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:09:46,648 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 21:09:46,649 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:09:46,649 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [2026468324] [2023-11-23 21:09:46,649 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [2026468324] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:09:46,650 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1978896301] [2023-11-23 21:09:46,650 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:09:46,650 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:09:46,651 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e36a390d-86b4-403d-9b3f-7370520df2e8/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:09:46,653 INFO L229 MonitoredProcess]: Starting monitored process 2 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e36a390d-86b4-403d-9b3f-7370520df2e8/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:09:46,669 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e36a390d-86b4-403d-9b3f-7370520df2e8/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Waiting until timeout for monitored process [2023-11-23 21:09:46,772 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:09:46,775 INFO L262 TraceCheckSpWp]: Trace formula consists of 121 conjuncts, 5 conjunts are in the unsatisfiable core [2023-11-23 21:09:46,780 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 21:09:46,832 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 21:09:46,833 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-23 21:09:46,854 INFO L134 CoverageAnalysis]: Checked inductivity of 1 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 0 trivial. 0 not checked. [2023-11-23 21:09:46,854 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1978896301] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-23 21:09:46,855 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [541554948] [2023-11-23 21:09:46,877 INFO L159 IcfgInterpreter]: Started Sifa with 8 locations of interest [2023-11-23 21:09:46,877 INFO L166 IcfgInterpreter]: Building call graph [2023-11-23 21:09:46,881 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-23 21:09:46,887 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-23 21:09:46,888 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-23 21:09:48,222 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-23 21:09:48,470 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSifa [541554948] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 21:09:48,471 INFO L185 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2023-11-23 21:09:48,471 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [4] imperfect sequences [3, 3, 3] total 7 [2023-11-23 21:09:48,472 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [1061668501] [2023-11-23 21:09:48,473 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:09:48,474 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-11-23 21:09:48,474 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:09:48,475 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-11-23 21:09:48,475 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=18, Invalid=38, Unknown=0, NotChecked=0, Total=56 [2023-11-23 21:09:48,476 INFO L87 Difference]: Start difference. First operand 14 states and 17 transitions. Second operand has 5 states, 5 states have (on average 1.6) internal successors, (8), 4 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:09:48,638 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:09:48,638 INFO L93 Difference]: Finished difference Result 22 states and 27 transitions. [2023-11-23 21:09:48,639 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-11-23 21:09:48,639 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 1.6) internal successors, (8), 4 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 8 [2023-11-23 21:09:48,639 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:09:48,641 INFO L225 Difference]: With dead ends: 22 [2023-11-23 21:09:48,641 INFO L226 Difference]: Without dead ends: 19 [2023-11-23 21:09:48,642 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 25 GetRequests, 17 SyntacticMatches, 2 SemanticMatches, 6 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 10 ImplicationChecksByTransitivity, 0.3s TimeCoverageRelationStatistics Valid=18, Invalid=38, Unknown=0, NotChecked=0, Total=56 [2023-11-23 21:09:48,643 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 5 mSDsluCounter, 9 mSDsCounter, 0 mSdLazyCounter, 45 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 5 SdHoareTripleChecker+Valid, 12 SdHoareTripleChecker+Invalid, 45 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 45 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-23 21:09:48,644 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [5 Valid, 12 Invalid, 45 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 45 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-23 21:09:48,645 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 19 states. [2023-11-23 21:09:48,650 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 19 to 15. [2023-11-23 21:09:48,651 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 15 states, 14 states have (on average 1.2857142857142858) internal successors, (18), 14 states have internal predecessors, (18), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:09:48,651 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 15 states to 15 states and 18 transitions. [2023-11-23 21:09:48,652 INFO L78 Accepts]: Start accepts. Automaton has 15 states and 18 transitions. Word has length 8 [2023-11-23 21:09:48,652 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:09:48,652 INFO L495 AbstractCegarLoop]: Abstraction has 15 states and 18 transitions. [2023-11-23 21:09:48,652 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 1.6) internal successors, (8), 4 states have internal predecessors, (8), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:09:48,653 INFO L276 IsEmpty]: Start isEmpty. Operand 15 states and 18 transitions. [2023-11-23 21:09:48,653 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 12 [2023-11-23 21:09:48,654 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:09:48,654 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:09:48,677 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e36a390d-86b4-403d-9b3f-7370520df2e8/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (2)] Forceful destruction successful, exit code 0 [2023-11-23 21:09:48,876 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable1,2 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e36a390d-86b4-403d-9b3f-7370520df2e8/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:09:48,876 INFO L420 AbstractCegarLoop]: === Iteration 3 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:09:48,877 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:09:48,877 INFO L85 PathProgramCache]: Analyzing trace with hash -1968536510, now seen corresponding path program 1 times [2023-11-23 21:09:48,877 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:09:48,878 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1759141595] [2023-11-23 21:09:48,878 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:09:48,878 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:09:48,909 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:09:49,064 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-23 21:09:49,065 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:09:49,065 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1759141595] [2023-11-23 21:09:49,066 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1759141595] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:09:49,069 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1305858043] [2023-11-23 21:09:49,070 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:09:49,070 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:09:49,070 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e36a390d-86b4-403d-9b3f-7370520df2e8/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:09:49,072 INFO L229 MonitoredProcess]: Starting monitored process 3 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e36a390d-86b4-403d-9b3f-7370520df2e8/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:09:49,074 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e36a390d-86b4-403d-9b3f-7370520df2e8/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Waiting until timeout for monitored process [2023-11-23 21:09:49,222 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:09:49,224 INFO L262 TraceCheckSpWp]: Trace formula consists of 159 conjuncts, 5 conjunts are in the unsatisfiable core [2023-11-23 21:09:49,227 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 21:09:49,247 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-23 21:09:49,248 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-23 21:09:49,272 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-23 21:09:49,274 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1305858043] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-23 21:09:49,274 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [504290791] [2023-11-23 21:09:49,291 INFO L159 IcfgInterpreter]: Started Sifa with 10 locations of interest [2023-11-23 21:09:49,293 INFO L166 IcfgInterpreter]: Building call graph [2023-11-23 21:09:49,294 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-23 21:09:49,294 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-23 21:09:49,295 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-23 21:09:50,423 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-23 21:09:52,166 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSifa [504290791] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 21:09:52,166 INFO L185 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2023-11-23 21:09:52,166 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [3, 3, 3] total 10 [2023-11-23 21:09:52,167 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [619536127] [2023-11-23 21:09:52,167 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:09:52,167 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2023-11-23 21:09:52,168 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:09:52,168 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2023-11-23 21:09:52,169 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=26, Invalid=83, Unknown=1, NotChecked=0, Total=110 [2023-11-23 21:09:52,169 INFO L87 Difference]: Start difference. First operand 15 states and 18 transitions. Second operand has 8 states, 8 states have (on average 1.375) internal successors, (11), 7 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:09:52,890 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:09:52,891 INFO L93 Difference]: Finished difference Result 24 states and 29 transitions. [2023-11-23 21:09:52,891 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2023-11-23 21:09:52,892 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 1.375) internal successors, (11), 7 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 11 [2023-11-23 21:09:52,892 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:09:52,894 INFO L225 Difference]: With dead ends: 24 [2023-11-23 21:09:52,895 INFO L226 Difference]: Without dead ends: 21 [2023-11-23 21:09:52,896 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 34 GetRequests, 23 SyntacticMatches, 2 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 1.8s TimeCoverageRelationStatistics Valid=26, Invalid=83, Unknown=1, NotChecked=0, Total=110 [2023-11-23 21:09:52,900 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 4 mSDsluCounter, 16 mSDsCounter, 0 mSdLazyCounter, 78 mSolverCounterSat, 0 mSolverCounterUnsat, 1 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.7s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4 SdHoareTripleChecker+Valid, 19 SdHoareTripleChecker+Invalid, 79 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 78 IncrementalHoareTripleChecker+Invalid, 1 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.7s IncrementalHoareTripleChecker+Time [2023-11-23 21:09:52,905 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [4 Valid, 19 Invalid, 79 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 78 Invalid, 1 Unknown, 0 Unchecked, 0.7s Time] [2023-11-23 21:09:52,908 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 21 states. [2023-11-23 21:09:52,914 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 21 to 17. [2023-11-23 21:09:52,916 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 17 states, 16 states have (on average 1.3125) internal successors, (21), 16 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) [2023-11-23 21:09:52,917 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 17 states to 17 states and 21 transitions. [2023-11-23 21:09:52,917 INFO L78 Accepts]: Start accepts. Automaton has 17 states and 21 transitions. Word has length 11 [2023-11-23 21:09:52,918 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:09:52,918 INFO L495 AbstractCegarLoop]: Abstraction has 17 states and 21 transitions. [2023-11-23 21:09:52,918 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 1.375) internal successors, (11), 7 states have internal predecessors, (11), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:09:52,919 INFO L276 IsEmpty]: Start isEmpty. Operand 17 states and 21 transitions. [2023-11-23 21:09:52,919 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 15 [2023-11-23 21:09:52,919 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:09:52,920 INFO L195 NwaCegarLoop]: trace histogram [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:09:52,946 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e36a390d-86b4-403d-9b3f-7370520df2e8/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (3)] Forceful destruction successful, exit code 0 [2023-11-23 21:09:53,131 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable2,3 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e36a390d-86b4-403d-9b3f-7370520df2e8/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:09:53,132 INFO L420 AbstractCegarLoop]: === Iteration 4 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:09:53,132 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:09:53,132 INFO L85 PathProgramCache]: Analyzing trace with hash 2120497703, now seen corresponding path program 1 times [2023-11-23 21:09:53,132 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:09:53,132 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [20648439] [2023-11-23 21:09:53,133 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:09:53,133 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:09:53,157 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:09:53,294 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-23 21:09:53,295 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:09:53,295 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [20648439] [2023-11-23 21:09:53,295 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [20648439] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:09:53,295 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1687030656] [2023-11-23 21:09:53,296 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:09:53,296 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:09:53,296 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e36a390d-86b4-403d-9b3f-7370520df2e8/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:09:53,297 INFO L229 MonitoredProcess]: Starting monitored process 4 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e36a390d-86b4-403d-9b3f-7370520df2e8/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:09:53,301 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e36a390d-86b4-403d-9b3f-7370520df2e8/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Waiting until timeout for monitored process [2023-11-23 21:09:53,439 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:09:53,441 INFO L262 TraceCheckSpWp]: Trace formula consists of 172 conjuncts, 5 conjunts are in the unsatisfiable core [2023-11-23 21:09:53,443 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 21:09:53,461 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-23 21:09:53,461 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-23 21:09:53,477 INFO L134 CoverageAnalysis]: Checked inductivity of 2 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-23 21:09:53,477 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1687030656] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-23 21:09:53,478 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [786580364] [2023-11-23 21:09:53,484 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2023-11-23 21:09:53,485 INFO L166 IcfgInterpreter]: Building call graph [2023-11-23 21:09:53,486 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-23 21:09:53,486 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-23 21:09:53,486 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-23 21:09:54,190 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-23 21:09:54,679 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSifa [786580364] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 21:09:54,679 INFO L185 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2023-11-23 21:09:54,680 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [7] imperfect sequences [3, 3, 3] total 10 [2023-11-23 21:09:54,680 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [504796789] [2023-11-23 21:09:54,680 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:09:54,681 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 8 states [2023-11-23 21:09:54,681 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:09:54,682 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 8 interpolants. [2023-11-23 21:09:54,682 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=28, Invalid=82, Unknown=0, NotChecked=0, Total=110 [2023-11-23 21:09:54,682 INFO L87 Difference]: Start difference. First operand 17 states and 21 transitions. Second operand has 8 states, 8 states have (on average 1.75) internal successors, (14), 7 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) [2023-11-23 21:09:54,841 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:09:54,841 INFO L93 Difference]: Finished difference Result 33 states and 42 transitions. [2023-11-23 21:09:54,842 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 8 states. [2023-11-23 21:09:54,842 INFO L78 Accepts]: Start accepts. Automaton has has 8 states, 8 states have (on average 1.75) internal successors, (14), 7 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 14 [2023-11-23 21:09:54,842 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:09:54,843 INFO L225 Difference]: With dead ends: 33 [2023-11-23 21:09:54,844 INFO L226 Difference]: Without dead ends: 24 [2023-11-23 21:09:54,844 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 43 GetRequests, 31 SyntacticMatches, 3 SemanticMatches, 9 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 22 ImplicationChecksByTransitivity, 0.5s TimeCoverageRelationStatistics Valid=28, Invalid=82, Unknown=0, NotChecked=0, Total=110 [2023-11-23 21:09:54,847 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 4 mSDsluCounter, 11 mSDsCounter, 0 mSdLazyCounter, 59 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4 SdHoareTripleChecker+Valid, 14 SdHoareTripleChecker+Invalid, 59 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 59 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-23 21:09:54,849 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [4 Valid, 14 Invalid, 59 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 59 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-23 21:09:54,849 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2023-11-23 21:09:54,856 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 21. [2023-11-23 21:09:54,856 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 21 states, 20 states have (on average 1.3) internal successors, (26), 20 states have internal predecessors, (26), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:09:54,857 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 21 states to 21 states and 26 transitions. [2023-11-23 21:09:54,857 INFO L78 Accepts]: Start accepts. Automaton has 21 states and 26 transitions. Word has length 14 [2023-11-23 21:09:54,858 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:09:54,858 INFO L495 AbstractCegarLoop]: Abstraction has 21 states and 26 transitions. [2023-11-23 21:09:54,858 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 8 states, 8 states have (on average 1.75) internal successors, (14), 7 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) [2023-11-23 21:09:54,858 INFO L276 IsEmpty]: Start isEmpty. Operand 21 states and 26 transitions. [2023-11-23 21:09:54,859 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 17 [2023-11-23 21:09:54,859 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:09:54,859 INFO L195 NwaCegarLoop]: trace histogram [2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:09:54,880 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e36a390d-86b4-403d-9b3f-7370520df2e8/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (4)] Forceful destruction successful, exit code 0 [2023-11-23 21:09:55,072 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable3,4 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e36a390d-86b4-403d-9b3f-7370520df2e8/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:09:55,073 INFO L420 AbstractCegarLoop]: === Iteration 5 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:09:55,073 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:09:55,074 INFO L85 PathProgramCache]: Analyzing trace with hash 893440738, now seen corresponding path program 1 times [2023-11-23 21:09:55,074 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:09:55,074 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [629778874] [2023-11-23 21:09:55,074 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:09:55,074 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:09:55,097 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:09:55,173 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-11-23 21:09:55,173 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:09:55,174 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [629778874] [2023-11-23 21:09:55,174 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [629778874] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:09:55,174 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1742041020] [2023-11-23 21:09:55,174 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:09:55,174 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:09:55,175 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e36a390d-86b4-403d-9b3f-7370520df2e8/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:09:55,176 INFO L229 MonitoredProcess]: Starting monitored process 5 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e36a390d-86b4-403d-9b3f-7370520df2e8/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:09:55,200 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e36a390d-86b4-403d-9b3f-7370520df2e8/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Waiting until timeout for monitored process [2023-11-23 21:09:55,294 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:09:55,296 INFO L262 TraceCheckSpWp]: Trace formula consists of 185 conjuncts, 5 conjunts are in the unsatisfiable core [2023-11-23 21:09:55,297 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 21:09:55,311 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-11-23 21:09:55,311 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-23 21:09:55,327 INFO L134 CoverageAnalysis]: Checked inductivity of 4 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 3 trivial. 0 not checked. [2023-11-23 21:09:55,327 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1742041020] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-23 21:09:55,327 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [649075903] [2023-11-23 21:09:55,330 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2023-11-23 21:09:55,330 INFO L166 IcfgInterpreter]: Building call graph [2023-11-23 21:09:55,330 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-23 21:09:55,331 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-23 21:09:55,331 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-23 21:09:56,631 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-23 21:09:57,356 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '561#(and (<= 1 |#StackHeapBarrier|) (= (+ |ULTIMATE.start_main_~i~0#1| 1) 0) (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))) (= |ULTIMATE.start_main_~data~0#1| 1) (= |ULTIMATE.start_main_~#s~0#1.offset| 0) (= |ULTIMATE.start_main_~len~0#1| 2) (= |ULTIMATE.start_dll_create_#res#1.offset| 0) (<= 2 |ULTIMATE.start_main_~#s~0#1.base|))' at error location [2023-11-23 21:09:57,356 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-23 21:09:57,356 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-23 21:09:57,357 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [3, 3, 3] total 4 [2023-11-23 21:09:57,357 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [96585684] [2023-11-23 21:09:57,357 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-23 21:09:57,358 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 5 states [2023-11-23 21:09:57,358 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:09:57,358 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 5 interpolants. [2023-11-23 21:09:57,359 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=35, Invalid=121, Unknown=0, NotChecked=0, Total=156 [2023-11-23 21:09:57,359 INFO L87 Difference]: Start difference. First operand 21 states and 26 transitions. Second operand has 5 states, 5 states have (on average 3.8) internal successors, (19), 4 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:09:57,414 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:09:57,414 INFO L93 Difference]: Finished difference Result 40 states and 50 transitions. [2023-11-23 21:09:57,414 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 4 states. [2023-11-23 21:09:57,415 INFO L78 Accepts]: Start accepts. Automaton has has 5 states, 5 states have (on average 3.8) internal successors, (19), 4 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 16 [2023-11-23 21:09:57,415 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:09:57,415 INFO L225 Difference]: With dead ends: 40 [2023-11-23 21:09:57,415 INFO L226 Difference]: Without dead ends: 24 [2023-11-23 21:09:57,416 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 49 GetRequests, 36 SyntacticMatches, 2 SemanticMatches, 11 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 36 ImplicationChecksByTransitivity, 0.7s TimeCoverageRelationStatistics Valid=35, Invalid=121, Unknown=0, NotChecked=0, Total=156 [2023-11-23 21:09:57,417 INFO L413 NwaCegarLoop]: 10 mSDtfsCounter, 2 mSDsluCounter, 20 mSDsCounter, 0 mSdLazyCounter, 17 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 2 SdHoareTripleChecker+Valid, 30 SdHoareTripleChecker+Invalid, 18 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 17 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.0s IncrementalHoareTripleChecker+Time [2023-11-23 21:09:57,417 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [2 Valid, 30 Invalid, 18 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 17 Invalid, 0 Unknown, 0 Unchecked, 0.0s Time] [2023-11-23 21:09:57,418 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 24 states. [2023-11-23 21:09:57,423 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 24 to 24. [2023-11-23 21:09:57,423 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 24 states, 23 states have (on average 1.2608695652173914) internal successors, (29), 23 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:09:57,424 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 24 states to 24 states and 29 transitions. [2023-11-23 21:09:57,424 INFO L78 Accepts]: Start accepts. Automaton has 24 states and 29 transitions. Word has length 16 [2023-11-23 21:09:57,424 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:09:57,424 INFO L495 AbstractCegarLoop]: Abstraction has 24 states and 29 transitions. [2023-11-23 21:09:57,424 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 5 states, 5 states have (on average 3.8) internal successors, (19), 4 states have internal predecessors, (19), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:09:57,424 INFO L276 IsEmpty]: Start isEmpty. Operand 24 states and 29 transitions. [2023-11-23 21:09:57,425 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 20 [2023-11-23 21:09:57,425 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:09:57,425 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:09:57,443 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e36a390d-86b4-403d-9b3f-7370520df2e8/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (5)] Forceful destruction successful, exit code 0 [2023-11-23 21:09:57,628 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable4,5 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e36a390d-86b4-403d-9b3f-7370520df2e8/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:09:57,629 INFO L420 AbstractCegarLoop]: === Iteration 6 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:09:57,629 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:09:57,629 INFO L85 PathProgramCache]: Analyzing trace with hash -354450734, now seen corresponding path program 2 times [2023-11-23 21:09:57,629 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:09:57,629 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1970970096] [2023-11-23 21:09:57,630 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:09:57,630 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:09:57,679 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:09:57,766 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2023-11-23 21:09:57,766 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:09:57,766 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1970970096] [2023-11-23 21:09:57,767 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1970970096] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:09:57,767 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [195534733] [2023-11-23 21:09:57,767 INFO L93 rtionOrderModulation]: Changing assertion order to OUTSIDE_LOOP_FIRST2 [2023-11-23 21:09:57,767 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:09:57,767 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e36a390d-86b4-403d-9b3f-7370520df2e8/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:09:57,768 INFO L229 MonitoredProcess]: Starting monitored process 6 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e36a390d-86b4-403d-9b3f-7370520df2e8/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:09:57,781 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e36a390d-86b4-403d-9b3f-7370520df2e8/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Waiting until timeout for monitored process [2023-11-23 21:09:57,892 INFO L228 tOrderPrioritization]: Assert order OUTSIDE_LOOP_FIRST2 issued 2 check-sat command(s) [2023-11-23 21:09:57,892 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-23 21:09:57,894 INFO L262 TraceCheckSpWp]: Trace formula consists of 172 conjuncts, 4 conjunts are in the unsatisfiable core [2023-11-23 21:09:57,895 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 21:09:57,927 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2023-11-23 21:09:57,927 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-23 21:09:57,959 INFO L134 CoverageAnalysis]: Checked inductivity of 8 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2023-11-23 21:09:57,959 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [195534733] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-23 21:09:57,959 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [150352314] [2023-11-23 21:09:57,961 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2023-11-23 21:09:57,962 INFO L166 IcfgInterpreter]: Building call graph [2023-11-23 21:09:57,962 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-23 21:09:57,962 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-23 21:09:57,962 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-23 21:09:59,499 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-23 21:10:00,256 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '769#(and (<= 1 |#StackHeapBarrier|) (= (+ |ULTIMATE.start_main_~i~0#1| 1) 0) (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))) (= |ULTIMATE.start_main_~data~0#1| 1) (= |ULTIMATE.start_main_~#s~0#1.offset| 0) (= |ULTIMATE.start_main_~len~0#1| 2) (= |ULTIMATE.start_dll_create_#res#1.offset| 0) (<= 2 |ULTIMATE.start_main_~#s~0#1.base|))' at error location [2023-11-23 21:10:00,256 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-23 21:10:00,256 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-23 21:10:00,256 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [4, 4, 4] total 6 [2023-11-23 21:10:00,256 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [926474229] [2023-11-23 21:10:00,256 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-23 21:10:00,257 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 7 states [2023-11-23 21:10:00,257 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:10:00,258 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 7 interpolants. [2023-11-23 21:10:00,258 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=58, Invalid=152, Unknown=0, NotChecked=0, Total=210 [2023-11-23 21:10:00,258 INFO L87 Difference]: Start difference. First operand 24 states and 29 transitions. Second operand has 7 states, 7 states have (on average 3.857142857142857) internal successors, (27), 6 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) [2023-11-23 21:10:00,354 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:10:00,354 INFO L93 Difference]: Finished difference Result 34 states and 40 transitions. [2023-11-23 21:10:00,356 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 5 states. [2023-11-23 21:10:00,356 INFO L78 Accepts]: Start accepts. Automaton has has 7 states, 7 states have (on average 3.857142857142857) internal successors, (27), 6 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) Word has length 19 [2023-11-23 21:10:00,356 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:10:00,357 INFO L225 Difference]: With dead ends: 34 [2023-11-23 21:10:00,357 INFO L226 Difference]: Without dead ends: 31 [2023-11-23 21:10:00,357 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 61 GetRequests, 44 SyntacticMatches, 2 SemanticMatches, 15 ConstructedPredicates, 0 IntricatePredicates, 0 DeprecatedPredicates, 69 ImplicationChecksByTransitivity, 0.8s TimeCoverageRelationStatistics Valid=74, Invalid=198, Unknown=0, NotChecked=0, Total=272 [2023-11-23 21:10:00,358 INFO L413 NwaCegarLoop]: 10 mSDtfsCounter, 50 mSDsluCounter, 20 mSDsCounter, 0 mSdLazyCounter, 17 mSolverCounterSat, 1 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.0s Time, 0 mProtectedPredicate, 0 mProtectedAction, 50 SdHoareTripleChecker+Valid, 30 SdHoareTripleChecker+Invalid, 18 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 1 IncrementalHoareTripleChecker+Valid, 17 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-23 21:10:00,359 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [50 Valid, 30 Invalid, 18 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [1 Valid, 17 Invalid, 0 Unknown, 0 Unchecked, 0.1s Time] [2023-11-23 21:10:00,360 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 31 states. [2023-11-23 21:10:00,366 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 31 to 29. [2023-11-23 21:10:00,366 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) [2023-11-23 21:10:00,367 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 29 states to 29 states and 35 transitions. [2023-11-23 21:10:00,367 INFO L78 Accepts]: Start accepts. Automaton has 29 states and 35 transitions. Word has length 19 [2023-11-23 21:10:00,367 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:10:00,367 INFO L495 AbstractCegarLoop]: Abstraction has 29 states and 35 transitions. [2023-11-23 21:10:00,368 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 7 states, 7 states have (on average 3.857142857142857) internal successors, (27), 6 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) [2023-11-23 21:10:00,368 INFO L276 IsEmpty]: Start isEmpty. Operand 29 states and 35 transitions. [2023-11-23 21:10:00,368 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 21 [2023-11-23 21:10:00,369 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:10:00,369 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:10:00,400 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e36a390d-86b4-403d-9b3f-7370520df2e8/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (6)] Forceful destruction successful, exit code 0 [2023-11-23 21:10:00,591 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable5,6 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e36a390d-86b4-403d-9b3f-7370520df2e8/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:10:00,591 INFO L420 AbstractCegarLoop]: === Iteration 7 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:10:00,592 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:10:00,592 INFO L85 PathProgramCache]: Analyzing trace with hash 1662225074, now seen corresponding path program 1 times [2023-11-23 21:10:00,592 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:10:00,592 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [177872704] [2023-11-23 21:10:00,592 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:10:00,592 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:10:00,644 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:10:01,073 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 1 proven. 4 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2023-11-23 21:10:01,074 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:10:01,074 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [177872704] [2023-11-23 21:10:01,074 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [177872704] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:10:01,076 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [1861665006] [2023-11-23 21:10:01,076 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:10:01,076 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:10:01,076 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e36a390d-86b4-403d-9b3f-7370520df2e8/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:10:01,077 INFO L229 MonitoredProcess]: Starting monitored process 7 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e36a390d-86b4-403d-9b3f-7370520df2e8/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:10:01,092 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e36a390d-86b4-403d-9b3f-7370520df2e8/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Waiting until timeout for monitored process [2023-11-23 21:10:01,222 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:10:01,225 INFO L262 TraceCheckSpWp]: Trace formula consists of 268 conjuncts, 30 conjunts are in the unsatisfiable core [2023-11-23 21:10:01,228 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 21:10:01,279 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2023-11-23 21:10:01,284 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2023-11-23 21:10:01,354 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 11 [2023-11-23 21:10:01,361 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 11 [2023-11-23 21:10:01,379 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 2 proven. 1 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2023-11-23 21:10:01,380 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-23 21:10:01,402 WARN L854 $PredicateComparison]: unable to prove that (and (forall ((v_ArrVal_483 (Array Int Int))) (= (select (select (store |c_#memory_$Pointer$.offset| |c_ULTIMATE.start_dll_remove_last_~snd_to_last~0#1.base| v_ArrVal_483) |c_ULTIMATE.start_main_~#s~0#1.base|) |c_ULTIMATE.start_main_~#s~0#1.offset|) 0)) (forall ((v_ArrVal_484 (Array Int Int))) (= 0 (select (select (store |c_#memory_$Pointer$.base| |c_ULTIMATE.start_dll_remove_last_~snd_to_last~0#1.base| v_ArrVal_484) |c_ULTIMATE.start_main_~#s~0#1.base|) |c_ULTIMATE.start_main_~#s~0#1.offset|)))) is different from false [2023-11-23 21:10:01,430 WARN L854 $PredicateComparison]: unable to prove that (and (forall ((v_ArrVal_483 (Array Int Int))) (= (select (select (store |c_#memory_$Pointer$.offset| 0 v_ArrVal_483) |c_ULTIMATE.start_main_~#s~0#1.base|) |c_ULTIMATE.start_main_~#s~0#1.offset|) 0)) (forall ((v_ArrVal_484 (Array Int Int))) (= (select (select (store |c_#memory_$Pointer$.base| 0 v_ArrVal_484) |c_ULTIMATE.start_main_~#s~0#1.base|) |c_ULTIMATE.start_main_~#s~0#1.offset|) 0))) is different from false [2023-11-23 21:10:01,456 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-11-23 21:10:01,457 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 1 case distinctions, treesize of input 18 treesize of output 19 [2023-11-23 21:10:01,468 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-11-23 21:10:01,468 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 [2023-11-23 21:10:01,486 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 1, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 5 treesize of output 3 [2023-11-23 21:10:01,494 INFO L349 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2023-11-23 21:10:01,495 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 [2023-11-23 21:10:01,519 INFO L134 CoverageAnalysis]: Checked inductivity of 10 backedges. 0 proven. 1 refuted. 0 times theorem prover too weak. 5 trivial. 4 not checked. [2023-11-23 21:10:01,519 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [1861665006] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-23 21:10:01,519 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1575258753] [2023-11-23 21:10:01,522 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2023-11-23 21:10:01,522 INFO L166 IcfgInterpreter]: Building call graph [2023-11-23 21:10:01,522 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-23 21:10:01,523 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-23 21:10:01,523 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-23 21:10:02,638 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-23 21:10:05,426 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSifa [1575258753] provided 1 perfect and 0 imperfect interpolant sequences [2023-11-23 21:10:05,426 INFO L185 FreeRefinementEngine]: Found 1 perfect and 3 imperfect interpolant sequences. [2023-11-23 21:10:05,427 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [9] imperfect sequences [7, 6, 7] total 18 [2023-11-23 21:10:05,427 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [2076227721] [2023-11-23 21:10:05,427 INFO L85 oduleStraightlineAll]: Using 1 perfect interpolants to construct interpolant automaton [2023-11-23 21:10:05,427 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 10 states [2023-11-23 21:10:05,428 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:10:05,428 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 10 interpolants. [2023-11-23 21:10:05,429 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=66, Invalid=211, Unknown=3, NotChecked=62, Total=342 [2023-11-23 21:10:05,429 INFO L87 Difference]: Start difference. First operand 29 states and 35 transitions. Second operand has 10 states, 10 states have (on average 1.5) internal successors, (15), 9 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:10:06,931 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:10:06,932 INFO L93 Difference]: Finished difference Result 43 states and 53 transitions. [2023-11-23 21:10:06,932 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2023-11-23 21:10:06,932 INFO L78 Accepts]: Start accepts. Automaton has has 10 states, 10 states have (on average 1.5) internal successors, (15), 9 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 20 [2023-11-23 21:10:06,932 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:10:06,933 INFO L225 Difference]: With dead ends: 43 [2023-11-23 21:10:06,933 INFO L226 Difference]: Without dead ends: 34 [2023-11-23 21:10:06,933 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 65 GetRequests, 45 SyntacticMatches, 3 SemanticMatches, 17 ConstructedPredicates, 2 IntricatePredicates, 0 DeprecatedPredicates, 39 ImplicationChecksByTransitivity, 2.9s TimeCoverageRelationStatistics Valid=66, Invalid=211, Unknown=3, NotChecked=62, Total=342 [2023-11-23 21:10:06,934 INFO L413 NwaCegarLoop]: 3 mSDtfsCounter, 4 mSDsluCounter, 19 mSDsCounter, 0 mSdLazyCounter, 91 mSolverCounterSat, 0 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 1.4s Time, 0 mProtectedPredicate, 0 mProtectedAction, 4 SdHoareTripleChecker+Valid, 22 SdHoareTripleChecker+Invalid, 91 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 0 IncrementalHoareTripleChecker+Valid, 91 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 0 IncrementalHoareTripleChecker+Unchecked, 1.5s IncrementalHoareTripleChecker+Time [2023-11-23 21:10:06,935 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [4 Valid, 22 Invalid, 91 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [0 Valid, 91 Invalid, 0 Unknown, 0 Unchecked, 1.5s Time] [2023-11-23 21:10:06,935 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 34 states. [2023-11-23 21:10:06,945 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 34 to 31. [2023-11-23 21:10:06,945 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 31 states, 30 states have (on average 1.2333333333333334) internal successors, (37), 30 states have internal predecessors, (37), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:10:06,946 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 31 states to 31 states and 37 transitions. [2023-11-23 21:10:06,946 INFO L78 Accepts]: Start accepts. Automaton has 31 states and 37 transitions. Word has length 20 [2023-11-23 21:10:06,946 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:10:06,946 INFO L495 AbstractCegarLoop]: Abstraction has 31 states and 37 transitions. [2023-11-23 21:10:06,946 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 10 states, 10 states have (on average 1.5) internal successors, (15), 9 states have internal predecessors, (15), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:10:06,946 INFO L276 IsEmpty]: Start isEmpty. Operand 31 states and 37 transitions. [2023-11-23 21:10:06,947 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 23 [2023-11-23 21:10:06,947 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:10:06,947 INFO L195 NwaCegarLoop]: trace histogram [2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1] [2023-11-23 21:10:06,969 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e36a390d-86b4-403d-9b3f-7370520df2e8/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (7)] Forceful destruction successful, exit code 0 [2023-11-23 21:10:07,148 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable6,7 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e36a390d-86b4-403d-9b3f-7370520df2e8/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:10:07,148 INFO L420 AbstractCegarLoop]: === Iteration 8 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:10:07,148 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:10:07,149 INFO L85 PathProgramCache]: Analyzing trace with hash -1419891539, now seen corresponding path program 1 times [2023-11-23 21:10:07,149 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:10:07,149 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1907110655] [2023-11-23 21:10:07,149 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:10:07,149 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:10:07,200 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:10:07,923 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 1 proven. 6 refuted. 0 times theorem prover too weak. 5 trivial. 0 not checked. [2023-11-23 21:10:07,924 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:10:07,924 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1907110655] [2023-11-23 21:10:07,924 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1907110655] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:10:07,924 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [373937812] [2023-11-23 21:10:07,924 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:10:07,924 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:10:07,924 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e36a390d-86b4-403d-9b3f-7370520df2e8/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:10:07,927 INFO L229 MonitoredProcess]: Starting monitored process 8 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e36a390d-86b4-403d-9b3f-7370520df2e8/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:10:07,929 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e36a390d-86b4-403d-9b3f-7370520df2e8/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Waiting until timeout for monitored process [2023-11-23 21:10:08,087 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:10:08,089 INFO L262 TraceCheckSpWp]: Trace formula consists of 281 conjuncts, 38 conjunts are in the unsatisfiable core [2023-11-23 21:10:08,094 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 21:10:08,123 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2023-11-23 21:10:08,128 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 0 select indices, 0 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 0 new quantified variables, introduced 0 case distinctions, treesize of input 11 treesize of output 7 [2023-11-23 21:10:08,284 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 11 [2023-11-23 21:10:08,291 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 1 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 16 treesize of output 11 [2023-11-23 21:10:08,312 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 3 proven. 2 refuted. 0 times theorem prover too weak. 7 trivial. 0 not checked. [2023-11-23 21:10:08,312 INFO L327 TraceCheckSpWp]: Computing backward predicates... [2023-11-23 21:10:08,337 WARN L854 $PredicateComparison]: unable to prove that (and (forall ((v_ArrVal_613 (Array Int Int))) (= (select (select (store |c_#memory_$Pointer$.base| |c_ULTIMATE.start_dll_remove_last_~snd_to_last~0#1.base| v_ArrVal_613) |c_ULTIMATE.start_main_~#s~0#1.base|) |c_ULTIMATE.start_main_~#s~0#1.offset|) 0)) (forall ((v_ArrVal_614 (Array Int Int))) (= (select (select (store |c_#memory_$Pointer$.offset| |c_ULTIMATE.start_dll_remove_last_~snd_to_last~0#1.base| v_ArrVal_614) |c_ULTIMATE.start_main_~#s~0#1.base|) |c_ULTIMATE.start_main_~#s~0#1.offset|) 0))) is different from false [2023-11-23 21:10:08,361 WARN L854 $PredicateComparison]: unable to prove that (and (forall ((v_ArrVal_614 (Array Int Int))) (= (select (select (store |c_#memory_$Pointer$.offset| |c_ULTIMATE.start_dll_remove_last_~last~0#1.base| v_ArrVal_614) |c_ULTIMATE.start_main_~#s~0#1.base|) |c_ULTIMATE.start_main_~#s~0#1.offset|) 0)) (forall ((v_ArrVal_613 (Array Int Int))) (= (select (select (store |c_#memory_$Pointer$.base| |c_ULTIMATE.start_dll_remove_last_~last~0#1.base| v_ArrVal_613) |c_ULTIMATE.start_main_~#s~0#1.base|) |c_ULTIMATE.start_main_~#s~0#1.offset|) 0))) is different from false [2023-11-23 21:10:08,386 WARN L854 $PredicateComparison]: unable to prove that (let ((.cse0 (select (select |c_#memory_$Pointer$.base| |c_ULTIMATE.start_dll_remove_last_~head#1.base|) |c_ULTIMATE.start_dll_remove_last_~head#1.offset|))) (and (forall ((v_ArrVal_614 (Array Int Int))) (= (select (select (store |c_#memory_$Pointer$.offset| .cse0 v_ArrVal_614) |c_ULTIMATE.start_main_~#s~0#1.base|) |c_ULTIMATE.start_main_~#s~0#1.offset|) 0)) (forall ((v_ArrVal_613 (Array Int Int))) (= (select (select (store |c_#memory_$Pointer$.base| .cse0 v_ArrVal_613) |c_ULTIMATE.start_main_~#s~0#1.base|) |c_ULTIMATE.start_main_~#s~0#1.offset|) 0)))) is different from false [2023-11-23 21:10:08,449 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 1 new quantified variables, introduced 0 case distinctions, treesize of input 58 treesize of output 54 [2023-11-23 21:10:08,455 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-11-23 21:10:08,455 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 54 treesize of output 46 [2023-11-23 21:10:08,466 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-11-23 21:10:08,466 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 70 treesize of output 69 [2023-11-23 21:10:08,474 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 [2023-11-23 21:10:08,509 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-23 21:10:08,510 INFO L190 IndexEqualityManager]: detected not equals via solver [2023-11-23 21:10:08,515 INFO L349 Elim1Store]: treesize reduction 7, result has 12.5 percent of original size [2023-11-23 21:10:08,516 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 [2023-11-23 21:10:08,545 INFO L134 CoverageAnalysis]: Checked inductivity of 12 backedges. 0 proven. 3 refuted. 1 times theorem prover too weak. 5 trivial. 3 not checked. [2023-11-23 21:10:08,546 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleZ3 [373937812] provided 0 perfect and 2 imperfect interpolant sequences [2023-11-23 21:10:08,546 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSifa [1289303417] [2023-11-23 21:10:08,551 INFO L159 IcfgInterpreter]: Started Sifa with 13 locations of interest [2023-11-23 21:10:08,552 INFO L166 IcfgInterpreter]: Building call graph [2023-11-23 21:10:08,554 INFO L171 IcfgInterpreter]: Initial procedures are [ULTIMATE.start] [2023-11-23 21:10:08,554 INFO L176 IcfgInterpreter]: Starting interpretation [2023-11-23 21:10:08,555 INFO L197 IcfgInterpreter]: Interpreting procedure ULTIMATE.start with input of size 1 for LOIs [2023-11-23 21:10:10,230 INFO L180 IcfgInterpreter]: Interpretation finished [2023-11-23 21:10:10,997 INFO L133 SifaRunner]: Sifa could not show that error location is unreachable, found '1240#(and (<= 1 |#StackHeapBarrier|) (= (+ |ULTIMATE.start_main_~i~0#1| 1) 0) (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))) (= |ULTIMATE.start_main_~data~0#1| 1) (= |ULTIMATE.start_main_~#s~0#1.offset| 0) (= |ULTIMATE.start_main_~len~0#1| 2) (= |ULTIMATE.start_dll_create_#res#1.offset| 0) (<= 2 |ULTIMATE.start_main_~#s~0#1.base|))' at error location [2023-11-23 21:10:10,998 WARN L311 FreeRefinementEngine]: Interpolation failed due to KNOWN_IGNORE: ALGORITHM_FAILED [2023-11-23 21:10:10,998 INFO L185 FreeRefinementEngine]: Found 0 perfect and 3 imperfect interpolant sequences. [2023-11-23 21:10:10,998 INFO L198 FreeRefinementEngine]: Number of different interpolants: perfect sequences [] imperfect sequences [9, 8, 9] total 16 [2023-11-23 21:10:10,998 INFO L121 tionRefinementEngine]: Using interpolant automaton builder IpAbStrategyModuleStraightlineAll [903859183] [2023-11-23 21:10:10,998 INFO L85 oduleStraightlineAll]: Using 3 imperfect interpolants to construct interpolant automaton [2023-11-23 21:10:10,999 INFO L571 AbstractCegarLoop]: INTERPOLANT automaton has 17 states [2023-11-23 21:10:10,999 INFO L100 FreeRefinementEngine]: Using predicate unifier PredicateUnifier provided by strategy SIFA_TAIPAN [2023-11-23 21:10:10,999 INFO L143 InterpolantAutomaton]: Constructing interpolant automaton starting with 17 interpolants. [2023-11-23 21:10:11,000 INFO L145 InterpolantAutomaton]: CoverageRelationStatistics Valid=82, Invalid=337, Unknown=13, NotChecked=120, Total=552 [2023-11-23 21:10:11,000 INFO L87 Difference]: Start difference. First operand 31 states and 37 transitions. Second operand has 17 states, 17 states have (on average 2.1176470588235294) internal successors, (36), 16 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:10:11,262 INFO L144 Difference]: Subtrahend was deterministic. Have not used determinization. [2023-11-23 21:10:11,263 INFO L93 Difference]: Finished difference Result 46 states and 56 transitions. [2023-11-23 21:10:11,263 INFO L141 InterpolantAutomaton]: Switched to read-only mode: deterministic interpolant automaton has 9 states. [2023-11-23 21:10:11,263 INFO L78 Accepts]: Start accepts. Automaton has has 17 states, 17 states have (on average 2.1176470588235294) internal successors, (36), 16 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) Word has length 22 [2023-11-23 21:10:11,264 INFO L84 Accepts]: Finished accepts. some prefix is accepted. [2023-11-23 21:10:11,264 INFO L225 Difference]: With dead ends: 46 [2023-11-23 21:10:11,264 INFO L226 Difference]: Without dead ends: 26 [2023-11-23 21:10:11,265 INFO L412 NwaCegarLoop]: 0 DeclaredPredicates, 78 GetRequests, 45 SyntacticMatches, 8 SemanticMatches, 25 ConstructedPredicates, 3 IntricatePredicates, 0 DeprecatedPredicates, 137 ImplicationChecksByTransitivity, 1.1s TimeCoverageRelationStatistics Valid=114, Invalid=437, Unknown=13, NotChecked=138, Total=702 [2023-11-23 21:10:11,266 INFO L413 NwaCegarLoop]: 10 mSDtfsCounter, 42 mSDsluCounter, 26 mSDsCounter, 0 mSdLazyCounter, 85 mSolverCounterSat, 7 mSolverCounterUnsat, 0 mSolverCounterUnknown, 0 mSolverCounterNotChecked, 0.1s Time, 0 mProtectedPredicate, 0 mProtectedAction, 42 SdHoareTripleChecker+Valid, 36 SdHoareTripleChecker+Invalid, 185 SdHoareTripleChecker+Unknown, 0 SdHoareTripleChecker+Unchecked, 0.0s SdHoareTripleChecker+Time, 7 IncrementalHoareTripleChecker+Valid, 85 IncrementalHoareTripleChecker+Invalid, 0 IncrementalHoareTripleChecker+Unknown, 93 IncrementalHoareTripleChecker+Unchecked, 0.1s IncrementalHoareTripleChecker+Time [2023-11-23 21:10:11,267 INFO L414 NwaCegarLoop]: SdHoareTripleChecker [42 Valid, 36 Invalid, 185 Unknown, 0 Unchecked, 0.0s Time], IncrementalHoareTripleChecker [7 Valid, 85 Invalid, 0 Unknown, 93 Unchecked, 0.1s Time] [2023-11-23 21:10:11,267 INFO L82 GeneralOperation]: Start minimizeSevpa. Operand 26 states. [2023-11-23 21:10:11,274 INFO L88 GeneralOperation]: Finished minimizeSevpa. Reduced states from 26 to 26. [2023-11-23 21:10:11,274 INFO L82 GeneralOperation]: Start removeUnreachable. Operand has 26 states, 25 states have (on average 1.16) internal successors, (29), 25 states have internal predecessors, (29), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:10:11,275 INFO L88 GeneralOperation]: Finished removeUnreachable. Reduced from 26 states to 26 states and 29 transitions. [2023-11-23 21:10:11,275 INFO L78 Accepts]: Start accepts. Automaton has 26 states and 29 transitions. Word has length 22 [2023-11-23 21:10:11,275 INFO L84 Accepts]: Finished accepts. word is rejected. [2023-11-23 21:10:11,275 INFO L495 AbstractCegarLoop]: Abstraction has 26 states and 29 transitions. [2023-11-23 21:10:11,276 INFO L496 AbstractCegarLoop]: INTERPOLANT automaton has has 17 states, 17 states have (on average 2.1176470588235294) internal successors, (36), 16 states have internal predecessors, (36), 0 states have call successors, (0), 0 states have call predecessors, (0), 0 states have return successors, (0), 0 states have call predecessors, (0), 0 states have call successors, (0) [2023-11-23 21:10:11,276 INFO L276 IsEmpty]: Start isEmpty. Operand 26 states and 29 transitions. [2023-11-23 21:10:11,277 INFO L282 IsEmpty]: Finished isEmpty. Found accepting run of length 26 [2023-11-23 21:10:11,277 INFO L187 NwaCegarLoop]: Found error trace [2023-11-23 21:10:11,277 INFO L195 NwaCegarLoop]: trace histogram [3, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1] [2023-11-23 21:10:11,293 INFO L540 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e36a390d-86b4-403d-9b3f-7370520df2e8/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (8)] Forceful destruction successful, exit code 0 [2023-11-23 21:10:11,480 WARN L477 AbstractCegarLoop]: Destroyed unattended storables created during the last iteration: SelfDestructingSolverStorable7,8 /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e36a390d-86b4-403d-9b3f-7370520df2e8/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:10:11,481 INFO L420 AbstractCegarLoop]: === Iteration 9 === Targeting ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION === [ULTIMATE.startErr0ASSERT_VIOLATIONERROR_FUNCTION] === [2023-11-23 21:10:11,481 INFO L160 PredicateUnifier]: Initialized classic predicate unifier [2023-11-23 21:10:11,481 INFO L85 PathProgramCache]: Analyzing trace with hash -27521230, now seen corresponding path program 3 times [2023-11-23 21:10:11,482 INFO L118 FreeRefinementEngine]: Executing refinement strategy SIFA_TAIPAN [2023-11-23 21:10:11,482 INFO L334 FreeRefinementEngine]: Using trace check IpTcStrategyModuleSmtInterpolCraig [1071444771] [2023-11-23 21:10:11,482 INFO L95 rtionOrderModulation]: Keeping assertion order NOT_INCREMENTALLY [2023-11-23 21:10:11,482 INFO L127 SolverBuilder]: Constructing new instance of SMTInterpol with explicit timeout -1 ms and remaining time -1 ms [2023-11-23 21:10:11,550 INFO L136 AnnotateAndAsserter]: Conjunction of SSA is unsat [2023-11-23 21:10:12,611 INFO L134 CoverageAnalysis]: Checked inductivity of 17 backedges. 8 proven. 8 refuted. 0 times theorem prover too weak. 1 trivial. 0 not checked. [2023-11-23 21:10:12,611 INFO L136 FreeRefinementEngine]: Strategy SIFA_TAIPAN found an infeasible trace [2023-11-23 21:10:12,611 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleSmtInterpolCraig [1071444771] [2023-11-23 21:10:12,611 INFO L158 FreeRefinementEngine]: IpTcStrategyModuleSmtInterpolCraig [1071444771] provided 0 perfect and 1 imperfect interpolant sequences [2023-11-23 21:10:12,611 INFO L334 FreeRefinementEngine]: Using interpolant generator IpTcStrategyModuleZ3 [785919705] [2023-11-23 21:10:12,611 INFO L93 rtionOrderModulation]: Changing assertion order to TERMS_WITH_SMALL_CONSTANTS_FIRST [2023-11-23 21:10:12,612 INFO L173 SolverBuilder]: Constructing external solver with command: z3 -smt2 -in SMTLIB2_COMPLIANT=true [2023-11-23 21:10:12,612 INFO L189 MonitoredProcess]: No working directory specified, using /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e36a390d-86b4-403d-9b3f-7370520df2e8/bin/utaipan-verify-mE87zJ7Ire/z3 [2023-11-23 21:10:12,613 INFO L229 MonitoredProcess]: Starting monitored process 9 with /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e36a390d-86b4-403d-9b3f-7370520df2e8/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (exit command is (exit), workingDir is null) [2023-11-23 21:10:12,614 INFO L327 MonitoredProcess]: [MP /tmp/vcloud_worker_vcloud-master_on_vcloud-master/run_dir_e36a390d-86b4-403d-9b3f-7370520df2e8/bin/utaipan-verify-mE87zJ7Ire/z3 -smt2 -in SMTLIB2_COMPLIANT=true (9)] Waiting until timeout for monitored process [2023-11-23 21:10:12,822 INFO L228 tOrderPrioritization]: Assert order TERMS_WITH_SMALL_CONSTANTS_FIRST issued 0 check-sat command(s) [2023-11-23 21:10:12,822 INFO L229 tOrderPrioritization]: Conjunction of SSA is unsat [2023-11-23 21:10:12,825 INFO L262 TraceCheckSpWp]: Trace formula consists of 225 conjuncts, 47 conjunts are in the unsatisfiable core [2023-11-23 21:10:12,829 INFO L285 TraceCheckSpWp]: Computing forward predicates... [2023-11-23 21:10:12,916 INFO L349 Elim1Store]: treesize reduction 19, result has 47.2 percent of original size [2023-11-23 21:10:12,916 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 1 stores, 1 select indices, 1 select index equivalence classes, 0 disjoint index pairs (out of 0 index pairs), introduced 2 new quantified variables, introduced 1 case distinctions, treesize of input 21 treesize of output 30 [2023-11-23 21:10:13,555 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-11-23 21:10:13,555 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 7 select indices, 7 select index equivalence classes, 0 disjoint index pairs (out of 21 index pairs), introduced 9 new quantified variables, introduced 21 case distinctions, treesize of input 167 treesize of output 411 [2023-11-23 21:10:14,369 INFO L349 Elim1Store]: treesize reduction 0, result has 100.0 percent of original size [2023-11-23 21:10:14,370 INFO L378 Elim1Store]: Elim1 eliminated variable of array dimension 2, 0 stores, 9 select indices, 9 select index equivalence classes, 0 disjoint index pairs (out of 36 index pairs), introduced 11 new quantified variables, introduced 36 case distinctions, treesize of input 225 treesize of output 617